diff options
| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 14:29:10 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 14:29:10 +0000 |
| commit | 2aa4a82499d4becd2284cdb482213d541b8804dd (patch) | |
| tree | b80bf8bf13c3766139fbacc530efd0dd9d54394c /other-licenses/snappy/src | |
| parent | Initial commit. (diff) | |
| download | firefox-2aa4a82499d4becd2284cdb482213d541b8804dd.tar.xz firefox-2aa4a82499d4becd2284cdb482213d541b8804dd.zip | |
Adding upstream version 86.0.1.upstream/86.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'other-licenses/snappy/src')
20 files changed, 8783 insertions, 0 deletions
diff --git a/other-licenses/snappy/src/AUTHORS b/other-licenses/snappy/src/AUTHORS new file mode 100644 index 0000000000..4858b377c7 --- /dev/null +++ b/other-licenses/snappy/src/AUTHORS @@ -0,0 +1 @@ +opensource@google.com diff --git a/other-licenses/snappy/src/COPYING b/other-licenses/snappy/src/COPYING new file mode 100644 index 0000000000..bd0e5971db --- /dev/null +++ b/other-licenses/snappy/src/COPYING @@ -0,0 +1,54 @@ +Copyright 2011, Google Inc. +All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are +met: + + * Redistributions of source code must retain the above copyright +notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above +copyright notice, this list of conditions and the following disclaimer +in the documentation and/or other materials provided with the +distribution. + * Neither the name of Google Inc. nor the names of its +contributors may be used to endorse or promote products derived from +this software without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +=== + +Some of the benchmark data in testdata/ is licensed differently: + + - fireworks.jpeg is Copyright 2013 Steinar H. Gunderson, and + is licensed under the Creative Commons Attribution 3.0 license + (CC-BY-3.0). See https://creativecommons.org/licenses/by/3.0/ + for more information. + + - kppkn.gtb is taken from the Gaviota chess tablebase set, and + is licensed under the MIT License. See + https://sites.google.com/site/gaviotachessengine/Home/endgame-tablebases-1 + for more information. + + - paper-100k.pdf is an excerpt (bytes 92160 to 194560) from the paper + “Combinatorial Modeling of Chromatin Features Quantitatively Predicts DNA + Replication Timing in _Drosophila_” by Federico Comoglio and Renato Paro, + which is licensed under the CC-BY license. See + http://www.ploscompbiol.org/static/license for more ifnormation. + + - alice29.txt, asyoulik.txt, plrabn12.txt and lcet10.txt are from Project + Gutenberg. The first three have expired copyrights and are in the public + domain; the latter does not have expired copyright, but is still in the + public domain according to the license information + (http://www.gutenberg.org/ebooks/53). diff --git a/other-licenses/snappy/src/ChangeLog b/other-licenses/snappy/src/ChangeLog new file mode 100644 index 0000000000..1478db5501 --- /dev/null +++ b/other-licenses/snappy/src/ChangeLog @@ -0,0 +1,2468 @@ +commit eb66d8176b3d1f560ee012e1b488cb1540c45f88 +Author: Steinar H. Gunderson <sesse@google.com> +Date: Mon Jun 22 16:10:47 2015 +0200 + + Initialized members of SnappyArrayWriter and SnappyDecompressionValidator. + These members were almost surely initialized before use by other member + functions, but Coverity was warning about this. Eliminating these warnings + minimizes clutter in that report and the likelihood of overlooking a real bug. + + A=cmumford + R=jeff + +commit b2312c4c25883ab03b5110f1b006dce95f419a4f +Author: Steinar H. Gunderson <sesse@google.com> +Date: Mon Jun 22 16:03:28 2015 +0200 + + Add support for Uncompress(source, sink). Various changes to allow + Uncompress(source, sink) to get the same performance as the different + variants of Uncompress to Cord/DataBuffer/String/FlatBuffer. + + Changes to efficiently support Uncompress(source, sink) + -------- + + a) For strings - we add support to StringByteSink to do GetAppendBuffer so we + can write to it without copying. + b) For flat array buffers, we do GetAppendBuffer and see if we can get a full buffer. + + With the above changes we get performance with ByteSource/ByteSink + that is very close to directly using flat arrays and strings. + + We add various benchmark cases to demonstrate that. + + Orthogonal change + ------------------ + + Add support for TryFastAppend() for SnappyScatteredWriter. + + Benchmark results are below + + CPU: Intel Core2 dL1:32KB dL2:4096KB + Benchmark Time(ns) CPU(ns) Iterations + ----------------------------------------------------- + BM_UFlat/0 109065 108996 6410 896.0MB/s html + BM_UFlat/1 1012175 1012343 691 661.4MB/s urls + BM_UFlat/2 26775 26771 26149 4.4GB/s jpg + BM_UFlat/3 48947 48940 14363 1.8GB/s pdf + BM_UFlat/4 441029 440835 1589 886.1MB/s html4 + BM_UFlat/5 39861 39880 17823 588.3MB/s cp + BM_UFlat/6 18315 18300 38126 581.1MB/s c + BM_UFlat/7 5254 5254 100000 675.4MB/s lsp + BM_UFlat/8 1568060 1567376 447 626.6MB/s xls + BM_UFlat/9 337512 337734 2073 429.5MB/s txt1 + BM_UFlat/10 287269 287054 2434 415.9MB/s txt2 + BM_UFlat/11 890098 890219 787 457.2MB/s txt3 + BM_UFlat/12 1186593 1186863 590 387.2MB/s txt4 + BM_UFlat/13 573927 573318 1000 853.7MB/s bin + BM_UFlat/14 64250 64294 10000 567.2MB/s sum + BM_UFlat/15 7301 7300 96153 552.2MB/s man + BM_UFlat/16 109617 109636 6375 1031.5MB/s pb + BM_UFlat/17 364438 364497 1921 482.3MB/s gaviota + BM_UFlatSink/0 108518 108465 6450 900.4MB/s html + BM_UFlatSink/1 991952 991997 705 675.0MB/s urls + BM_UFlatSink/2 26815 26798 26065 4.4GB/s jpg + BM_UFlatSink/3 49127 49122 14255 1.8GB/s pdf + BM_UFlatSink/4 436674 436731 1604 894.4MB/s html4 + BM_UFlatSink/5 39738 39733 17345 590.5MB/s cp + BM_UFlatSink/6 18413 18416 37962 577.4MB/s c + BM_UFlatSink/7 5677 5676 100000 625.2MB/s lsp + BM_UFlatSink/8 1552175 1551026 451 633.2MB/s xls + BM_UFlatSink/9 338526 338489 2065 428.5MB/s txt1 + BM_UFlatSink/10 289387 289307 2420 412.6MB/s txt2 + BM_UFlatSink/11 893803 893706 783 455.4MB/s txt3 + BM_UFlatSink/12 1195919 1195459 586 384.4MB/s txt4 + BM_UFlatSink/13 559637 559779 1000 874.3MB/s bin + BM_UFlatSink/14 65073 65094 10000 560.2MB/s sum + BM_UFlatSink/15 7618 7614 92823 529.5MB/s man + BM_UFlatSink/16 110085 110121 6352 1027.0MB/s pb + BM_UFlatSink/17 369196 368915 1896 476.5MB/s gaviota + BM_UValidate/0 46954 46957 14899 2.0GB/s html + BM_UValidate/1 500621 500868 1000 1.3GB/s urls + BM_UValidate/2 283 283 2481447 417.2GB/s jpg + BM_UValidate/3 16230 16228 43137 5.4GB/s pdf + BM_UValidate/4 189129 189193 3701 2.0GB/s html4 + + A=uday + R=sanjay + +commit b2ad96006741d40935db2f73194a3e489b467338 +Author: Steinar H. Gunderson <sesse@google.com> +Date: Mon Jun 22 15:48:29 2015 +0200 + + Changes to eliminate compiler warnings on MSVC + + This code was not compiling under Visual Studio 2013 with warnings being treated + as errors. Specifically: + + 1. Changed int -> size_t to eliminate signed/unsigned mismatch warning. + 2. Added some missing return values to functions. + 3. Inserting character instead of integer literals into strings to avoid type + conversions. + + A=cmumford + R=jeff + +commit e7a897e187e90b33f87bd9e64872cf561de9ebca +Author: Steinar H. Gunderson <sesse@google.com> +Date: Mon Jun 22 15:45:11 2015 +0200 + + Fixed unit tests to compile under MSVC. + + 1. Including config.h in test. + 2. Including windows.h before zippy-test.h. + 3. Removed definition of WIN32_LEAN_AND_MEAN. This caused problems in + build environments that define WIN32_LEAN_AND_MEAN as our + definition didn't check for prior existence. This constant is old + and no longer needed anyhow. + 4. Disable MSVC warning 4722 since ~LogMessageCrash() never returns. + + A=cmumford + R=jeff + +commit 86eb8b152bdb065ad11bf331a9f7d65b72616acf +Author: Steinar H. Gunderson <sesse@google.com> +Date: Mon Jun 22 15:41:30 2015 +0200 + + Change a few branch annotations that profiling found to be wrong. + Overall performance is neutral or slightly positive. + + Westmere (64-bit, opt): + + Benchmark Base (ns) New (ns) Improvement + -------------------------------------------------------------------------------------- + BM_UFlat/0 73798 71464 1.3GB/s html +3.3% + BM_UFlat/1 715223 704318 953.5MB/s urls +1.5% + BM_UFlat/2 8137 8871 13.0GB/s jpg -8.3% + BM_UFlat/3 200 204 935.5MB/s jpg_200 -2.0% + BM_UFlat/4 21627 21281 4.5GB/s pdf +1.6% + BM_UFlat/5 302806 290350 1.3GB/s html4 +4.3% + BM_UFlat/6 218920 219017 664.1MB/s txt1 -0.0% + BM_UFlat/7 190437 191212 626.1MB/s txt2 -0.4% + BM_UFlat/8 584192 580484 703.4MB/s txt3 +0.6% + BM_UFlat/9 776537 779055 591.6MB/s txt4 -0.3% + BM_UFlat/10 76056 72606 1.5GB/s pb +4.8% + BM_UFlat/11 235962 239043 737.4MB/s gaviota -1.3% + BM_UFlat/12 28049 28000 840.1MB/s cp +0.2% + BM_UFlat/13 12225 12021 886.9MB/s c +1.7% + BM_UFlat/14 3362 3544 1004.0MB/s lsp -5.1% + BM_UFlat/15 937015 939206 1048.9MB/s xls -0.2% + BM_UFlat/16 236 233 823.1MB/s xls_200 +1.3% + BM_UFlat/17 373170 361947 1.3GB/s bin +3.1% + BM_UFlat/18 264 264 725.5MB/s bin_200 +0.0% + BM_UFlat/19 42834 43577 839.2MB/s sum -1.7% + BM_UFlat/20 4770 4736 853.6MB/s man +0.7% + BM_UValidate/0 39671 39944 2.4GB/s html -0.7% + BM_UValidate/1 443391 443391 1.5GB/s urls +0.0% + BM_UValidate/2 163 163 703.3GB/s jpg +0.0% + BM_UValidate/3 113 112 1.7GB/s jpg_200 +0.9% + BM_UValidate/4 7555 7608 12.6GB/s pdf -0.7% + BM_ZFlat/0 157616 157568 621.5MB/s html (22.31 %) +0.0% + BM_ZFlat/1 1997290 2014486 333.4MB/s urls (47.77 %) -0.9% + BM_ZFlat/2 23035 22237 5.2GB/s jpg (99.95 %) +3.6% + BM_ZFlat/3 539 540 354.5MB/s jpg_200 (73.00 %) -0.2% + BM_ZFlat/4 80709 81369 1.2GB/s pdf (81.85 %) -0.8% + BM_ZFlat/5 639059 639220 613.0MB/s html4 (22.51 %) -0.0% + BM_ZFlat/6 577203 583370 249.3MB/s txt1 (57.87 %) -1.1% + BM_ZFlat/7 510887 516094 232.0MB/s txt2 (61.93 %) -1.0% + BM_ZFlat/8 1535843 1556973 262.2MB/s txt3 (54.92 %) -1.4% + BM_ZFlat/9 2070068 2102380 219.3MB/s txt4 (66.22 %) -1.5% + BM_ZFlat/10 152396 152148 745.5MB/s pb (19.64 %) +0.2% + BM_ZFlat/11 447367 445859 395.4MB/s gaviota (37.72 %) +0.3% + BM_ZFlat/12 76375 76797 306.3MB/s cp (48.12 %) -0.5% + BM_ZFlat/13 31518 31987 333.3MB/s c (42.40 %) -1.5% + BM_ZFlat/14 10598 10827 328.6MB/s lsp (48.37 %) -2.1% + BM_ZFlat/15 1782243 1802728 546.5MB/s xls (41.23 %) -1.1% + BM_ZFlat/16 526 539 355.0MB/s xls_200 (78.00 %) -2.4% + BM_ZFlat/17 598141 597311 822.1MB/s bin (18.11 %) +0.1% + BM_ZFlat/18 121 120 1.6GB/s bin_200 (7.50 %) +0.8% + BM_ZFlat/19 109981 112173 326.0MB/s sum (48.96 %) -2.0% + BM_ZFlat/20 14355 14575 277.4MB/s man (59.36 %) -1.5% + Sum of all benchmarks 33882722 33879325 +0.0% + + Sandy Bridge (64-bit, opt): + + Benchmark Base (ns) New (ns) Improvement + -------------------------------------------------------------------------------------- + BM_UFlat/0 43764 41600 2.3GB/s html +5.2% + BM_UFlat/1 517990 507058 1.3GB/s urls +2.2% + BM_UFlat/2 6625 5529 20.8GB/s jpg +19.8% + BM_UFlat/3 154 155 1.2GB/s jpg_200 -0.6% + BM_UFlat/4 12795 11747 8.1GB/s pdf +8.9% + BM_UFlat/5 200335 193413 2.0GB/s html4 +3.6% + BM_UFlat/6 156574 156426 929.2MB/s txt1 +0.1% + BM_UFlat/7 137574 137464 870.4MB/s txt2 +0.1% + BM_UFlat/8 422551 421603 967.4MB/s txt3 +0.2% + BM_UFlat/9 577749 578985 795.6MB/s txt4 -0.2% + BM_UFlat/10 42329 39362 2.8GB/s pb +7.5% + BM_UFlat/11 170615 169751 1037.9MB/s gaviota +0.5% + BM_UFlat/12 12800 12719 1.8GB/s cp +0.6% + BM_UFlat/13 6585 6579 1.6GB/s c +0.1% + BM_UFlat/14 2066 2044 1.7GB/s lsp +1.1% + BM_UFlat/15 750861 746911 1.3GB/s xls +0.5% + BM_UFlat/16 188 192 996.0MB/s xls_200 -2.1% + BM_UFlat/17 271622 264333 1.8GB/s bin +2.8% + BM_UFlat/18 208 207 923.6MB/s bin_200 +0.5% + BM_UFlat/19 24667 24845 1.4GB/s sum -0.7% + BM_UFlat/20 2663 2662 1.5GB/s man +0.0% + BM_ZFlat/0 115173 115624 846.5MB/s html (22.31 %) -0.4% + BM_ZFlat/1 1530331 1537769 436.5MB/s urls (47.77 %) -0.5% + BM_ZFlat/2 17503 17013 6.8GB/s jpg (99.95 %) +2.9% + BM_ZFlat/3 385 385 496.3MB/s jpg_200 (73.00 %) +0.0% + BM_ZFlat/4 61753 61540 1.6GB/s pdf (81.85 %) +0.3% + BM_ZFlat/5 484806 483356 810.1MB/s html4 (22.51 %) +0.3% + BM_ZFlat/6 464143 467609 310.9MB/s txt1 (57.87 %) -0.7% + BM_ZFlat/7 410315 413319 289.5MB/s txt2 (61.93 %) -0.7% + BM_ZFlat/8 1244082 1249381 326.5MB/s txt3 (54.92 %) -0.4% + BM_ZFlat/9 1696914 1709685 269.4MB/s txt4 (66.22 %) -0.7% + BM_ZFlat/10 104148 103372 1096.7MB/s pb (19.64 %) +0.8% + BM_ZFlat/11 363522 359722 489.8MB/s gaviota (37.72 %) +1.1% + BM_ZFlat/12 47021 50095 469.3MB/s cp (48.12 %) -6.1% + BM_ZFlat/13 16888 16985 627.4MB/s c (42.40 %) -0.6% + BM_ZFlat/14 5496 5469 650.3MB/s lsp (48.37 %) +0.5% + BM_ZFlat/15 1460713 1448760 679.5MB/s xls (41.23 %) +0.8% + BM_ZFlat/16 387 393 486.8MB/s xls_200 (78.00 %) -1.5% + BM_ZFlat/17 457654 451462 1086.6MB/s bin (18.11 %) +1.4% + BM_ZFlat/18 97 87 2.1GB/s bin_200 (7.50 %) +11.5% + BM_ZFlat/19 77904 80924 451.7MB/s sum (48.96 %) -3.7% + BM_ZFlat/20 7648 7663 527.1MB/s man (59.36 %) -0.2% + Sum of all benchmarks 25493635 25482069 +0.0% + + A=dehao + R=sesse + +commit 11ccdfb868387e56d845766d89ddab9d489c4128 +Author: Steinar H. Gunderson <sesse@google.com> +Date: Mon Jun 22 16:07:58 2015 +0200 + + Sync with various Google-internal changes. + + Should not mean much for the open-source version. + +commit 22acaf438ed93ab21a2ff1919d173206798b996e +Author: Steinar H. Gunderson <sesse@google.com> +Date: Mon Jun 22 15:39:08 2015 +0200 + + Change some internal path names. + + This is mostly to sync up with some changes from Google's internal + repositories; it does not affect the open-source distribution in itself. + +commit 1ff9be9b8fafc8528ca9e055646f5932aa5db9c4 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Fri Feb 28 11:18:07 2014 +0000 + + Release Snappy 1.1.2. + + R=jeff + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@84 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 19690d78e83f8963f497585031efa3d9ca66b807 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Feb 19 10:31:49 2014 +0000 + + Fix public issue 82: Stop distributing benchmark data files that have + unclear or unsuitable licensing. + + In general, we replace the files we can with liberally licensed data, + and remove all the others (in particular all the parts of the Canterbury + corpus that are not clearly in the public domain). The replacements + do not always have the exact same characteristics as the original ones, + but they are more than good enough to be useful for benchmarking. + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@83 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit f82bff66afe0de4c9ae22f8c4ef84e3c2233e799 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Fri Oct 25 13:31:27 2013 +0000 + + Add support for padding in the Snappy framed format. + + This is specifically motivated by DICOM's demands that embedded data + must be of an even number of bytes, but could in principle be used for + any sort of padding/alignment needed. + + R=sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@82 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit eeead8dc38ea359f027fb6e89f345448e8e9d723 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Tue Oct 15 15:21:31 2013 +0000 + + Release Snappy 1.1.1. + + R=jeff + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@81 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 6bc39e24c76adbbff26ae629fafbf7dfc795f554 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Tue Aug 13 12:55:00 2013 +0000 + + Add autoconf tests for size_t and ssize_t. Sort-of resolves public issue 79; + it would solve the problem if MSVC typically used autoconf. However, it gives + a natural place (config.h) to put the typedef even for MSVC. + + R=jsbell + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@80 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 7c3c01df77e191ad1f8377448961fe88db2802e9 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Mon Jul 29 11:06:44 2013 +0000 + + When we compare the number of bytes produced with the offset for a + backreference, make the signedness of the bytes produced clear, + by sticking it into a size_t. This avoids a signed/unsigned compare + warning from MSVC (public issue 71), and also is slightly clearer. + + Since the line is now so long the explanatory comment about the -1u + trick has to go somewhere else anyway, I used the opportunity to + explain it in slightly more detail. + + This is a purely stylistic change; the emitted assembler from GCC + is identical. + + R=jeff + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@79 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 2f0aaf8631d8fb2475ca1a6687c181efb14ed286 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Sun Jun 30 19:24:03 2013 +0000 + + In the fast path for decompressing literals, instead of checking + whether there's 16 bytes free and then checking right afterwards + (when having subtracted the literal size) that there are now + 5 bytes free, just check once for 21 bytes. This skips a compare + and a branch; although it is easily predictable, it is still + a few cycles on a fast path that we would like to get rid of. + + Benchmarking this yields very confusing results. On open-source + GCC 4.8.1 on Haswell, we get exactly the expected results; the + benchmarks where we hit the fast path for literals (in particular + the two HTML benchmarks and the protobuf benchmark) give very nice + speedups, and the others are not really affected. + + However, benchmarks with Google's GCC branch on other hardware + is much less clear. It seems that we have a weak loss in some cases + (and the win for the “typical” win cases are not nearly as clear), + but that it depends on microarchitecture and plain luck in how we run + the benchmark. Looking at the generated assembler, it seems that + the removal of the if causes other large-scale changes in how the + function is laid out, which makes it likely that this is just bad luck. + + Thus, we should keep this change, even though its exact current impact is + unclear; it's a sensible change per se, and dropping it on the basis of + microoptimization for a given compiler (or even branch of a compiler) + would seem like a bad strategy in the long run. + + Microbenchmark results (all in 64-bit, opt mode): + + Nehalem, Google GCC: + + Benchmark Base (ns) New (ns) Improvement + ------------------------------------------------------------------------------ + BM_UFlat/0 76747 75591 1.3GB/s html +1.5% + BM_UFlat/1 765756 757040 886.3MB/s urls +1.2% + BM_UFlat/2 10867 10893 10.9GB/s jpg -0.2% + BM_UFlat/3 124 131 1.4GB/s jpg_200 -5.3% + BM_UFlat/4 31663 31596 2.8GB/s pdf +0.2% + BM_UFlat/5 314162 308176 1.2GB/s html4 +1.9% + BM_UFlat/6 29668 29746 790.6MB/s cp -0.3% + BM_UFlat/7 12958 13386 796.4MB/s c -3.2% + BM_UFlat/8 3596 3682 966.0MB/s lsp -2.3% + BM_UFlat/9 1019193 1033493 953.3MB/s xls -1.4% + BM_UFlat/10 239 247 775.3MB/s xls_200 -3.2% + BM_UFlat/11 236411 240271 606.9MB/s txt1 -1.6% + BM_UFlat/12 206639 209768 571.2MB/s txt2 -1.5% + BM_UFlat/13 627803 635722 641.4MB/s txt3 -1.2% + BM_UFlat/14 845932 857816 538.2MB/s txt4 -1.4% + BM_UFlat/15 402107 391670 1.2GB/s bin +2.7% + BM_UFlat/16 283 279 683.6MB/s bin_200 +1.4% + BM_UFlat/17 46070 46815 781.5MB/s sum -1.6% + BM_UFlat/18 5053 5163 782.0MB/s man -2.1% + BM_UFlat/19 79721 76581 1.4GB/s pb +4.1% + BM_UFlat/20 251158 252330 697.5MB/s gaviota -0.5% + Sum of all benchmarks 4966150 4980396 -0.3% + + + Sandy Bridge, Google GCC: + + Benchmark Base (ns) New (ns) Improvement + ------------------------------------------------------------------------------ + BM_UFlat/0 42850 42182 2.3GB/s html +1.6% + BM_UFlat/1 525660 515816 1.3GB/s urls +1.9% + BM_UFlat/2 7173 7283 16.3GB/s jpg -1.5% + BM_UFlat/3 92 91 2.1GB/s jpg_200 +1.1% + BM_UFlat/4 15147 14872 5.9GB/s pdf +1.8% + BM_UFlat/5 199936 192116 2.0GB/s html4 +4.1% + BM_UFlat/6 12796 12443 1.8GB/s cp +2.8% + BM_UFlat/7 6588 6400 1.6GB/s c +2.9% + BM_UFlat/8 2010 1951 1.8GB/s lsp +3.0% + BM_UFlat/9 761124 763049 1.3GB/s xls -0.3% + BM_UFlat/10 186 189 1016.1MB/s xls_200 -1.6% + BM_UFlat/11 159354 158460 918.6MB/s txt1 +0.6% + BM_UFlat/12 139732 139950 856.1MB/s txt2 -0.2% + BM_UFlat/13 429917 425027 961.7MB/s txt3 +1.2% + BM_UFlat/14 585255 587324 785.8MB/s txt4 -0.4% + BM_UFlat/15 276186 266173 1.8GB/s bin +3.8% + BM_UFlat/16 205 207 925.5MB/s bin_200 -1.0% + BM_UFlat/17 24925 24935 1.4GB/s sum -0.0% + BM_UFlat/18 2632 2576 1.5GB/s man +2.2% + BM_UFlat/19 40546 39108 2.8GB/s pb +3.7% + BM_UFlat/20 175803 168209 1048.9MB/s gaviota +4.5% + Sum of all benchmarks 3408117 3368361 +1.2% + + + Haswell, upstream GCC 4.8.1: + + Benchmark Base (ns) New (ns) Improvement + ------------------------------------------------------------------------------ + BM_UFlat/0 46308 40641 2.3GB/s html +13.9% + BM_UFlat/1 513385 514706 1.3GB/s urls -0.3% + BM_UFlat/2 6197 6151 19.2GB/s jpg +0.7% + BM_UFlat/3 61 61 3.0GB/s jpg_200 +0.0% + BM_UFlat/4 13551 13429 6.5GB/s pdf +0.9% + BM_UFlat/5 198317 190243 2.0GB/s html4 +4.2% + BM_UFlat/6 14768 12560 1.8GB/s cp +17.6% + BM_UFlat/7 6453 6447 1.6GB/s c +0.1% + BM_UFlat/8 1991 1980 1.8GB/s lsp +0.6% + BM_UFlat/9 766947 770424 1.2GB/s xls -0.5% + BM_UFlat/10 170 169 1.1GB/s xls_200 +0.6% + BM_UFlat/11 164350 163554 888.7MB/s txt1 +0.5% + BM_UFlat/12 145444 143830 832.1MB/s txt2 +1.1% + BM_UFlat/13 437849 438413 929.2MB/s txt3 -0.1% + BM_UFlat/14 603587 605309 759.8MB/s txt4 -0.3% + BM_UFlat/15 249799 248067 1.9GB/s bin +0.7% + BM_UFlat/16 191 188 1011.4MB/s bin_200 +1.6% + BM_UFlat/17 26064 24778 1.4GB/s sum +5.2% + BM_UFlat/18 2620 2601 1.5GB/s man +0.7% + BM_UFlat/19 44551 37373 3.0GB/s pb +19.2% + BM_UFlat/20 165408 164584 1.0GB/s gaviota +0.5% + Sum of all benchmarks 3408011 3385508 +0.7% + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@78 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 062bf544a61107db730b6d08cb0b159c4dd9b24c +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Fri Jun 14 21:42:26 2013 +0000 + + Make the two IncrementalCopy* functions take in an ssize_t instead of a len, + in order to avoid having to do 32-to-64-bit signed conversions on a hot path + during decompression. (Also fixes some MSVC warnings, mentioned in public + issue 75, but more of those remain.) They cannot be size_t because we expect + them to go negative and test for that. + + This saves a few movzwl instructions, yielding ~2% speedup in decompression. + + + Sandy Bridge: + + Benchmark Base (ns) New (ns) Improvement + ------------------------------------------------------------------------------------------------- + BM_UFlat/0 48009 41283 2.3GB/s html +16.3% + BM_UFlat/1 531274 513419 1.3GB/s urls +3.5% + BM_UFlat/2 7378 7062 16.8GB/s jpg +4.5% + BM_UFlat/3 92 92 2.0GB/s jpg_200 +0.0% + BM_UFlat/4 15057 14974 5.9GB/s pdf +0.6% + BM_UFlat/5 204323 193140 2.0GB/s html4 +5.8% + BM_UFlat/6 13282 12611 1.8GB/s cp +5.3% + BM_UFlat/7 6511 6504 1.6GB/s c +0.1% + BM_UFlat/8 2014 2030 1.7GB/s lsp -0.8% + BM_UFlat/9 775909 768336 1.3GB/s xls +1.0% + BM_UFlat/10 182 184 1043.2MB/s xls_200 -1.1% + BM_UFlat/11 167352 161630 901.2MB/s txt1 +3.5% + BM_UFlat/12 147393 142246 842.8MB/s txt2 +3.6% + BM_UFlat/13 449960 432853 944.4MB/s txt3 +4.0% + BM_UFlat/14 620497 594845 775.9MB/s txt4 +4.3% + BM_UFlat/15 265610 267356 1.8GB/s bin -0.7% + BM_UFlat/16 206 205 932.7MB/s bin_200 +0.5% + BM_UFlat/17 25561 24730 1.4GB/s sum +3.4% + BM_UFlat/18 2620 2644 1.5GB/s man -0.9% + BM_UFlat/19 45766 38589 2.9GB/s pb +18.6% + BM_UFlat/20 171107 169832 1039.5MB/s gaviota +0.8% + Sum of all benchmarks 3500103 3394565 +3.1% + + + Westmere: + + Benchmark Base (ns) New (ns) Improvement + ------------------------------------------------------------------------------------------------- + BM_UFlat/0 72624 71526 1.3GB/s html +1.5% + BM_UFlat/1 735821 722917 930.8MB/s urls +1.8% + BM_UFlat/2 10450 10172 11.7GB/s jpg +2.7% + BM_UFlat/3 117 117 1.6GB/s jpg_200 +0.0% + BM_UFlat/4 29817 29648 3.0GB/s pdf +0.6% + BM_UFlat/5 297126 293073 1.3GB/s html4 +1.4% + BM_UFlat/6 28252 27994 842.0MB/s cp +0.9% + BM_UFlat/7 12672 12391 862.1MB/s c +2.3% + BM_UFlat/8 3507 3425 1040.9MB/s lsp +2.4% + BM_UFlat/9 1004268 969395 1018.0MB/s xls +3.6% + BM_UFlat/10 233 227 844.8MB/s xls_200 +2.6% + BM_UFlat/11 230054 224981 647.8MB/s txt1 +2.3% + BM_UFlat/12 201229 196447 610.5MB/s txt2 +2.4% + BM_UFlat/13 609547 596761 685.3MB/s txt3 +2.1% + BM_UFlat/14 824362 804821 573.8MB/s txt4 +2.4% + BM_UFlat/15 371095 374899 1.3GB/s bin -1.0% + BM_UFlat/16 267 267 717.8MB/s bin_200 +0.0% + BM_UFlat/17 44623 43828 835.9MB/s sum +1.8% + BM_UFlat/18 5077 4815 841.0MB/s man +5.4% + BM_UFlat/19 74964 73210 1.5GB/s pb +2.4% + BM_UFlat/20 237987 236745 746.0MB/s gaviota +0.5% + Sum of all benchmarks 4794092 4697659 +2.1% + + + Istanbul: + + Benchmark Base (ns) New (ns) Improvement + ------------------------------------------------------------------------------------------------- + BM_UFlat/0 98614 96376 1020.4MB/s html +2.3% + BM_UFlat/1 963740 953241 707.2MB/s urls +1.1% + BM_UFlat/2 25042 24769 4.8GB/s jpg +1.1% + BM_UFlat/3 180 180 1065.6MB/s jpg_200 +0.0% + BM_UFlat/4 45942 45403 1.9GB/s pdf +1.2% + BM_UFlat/5 400135 390226 1008.2MB/s html4 +2.5% + BM_UFlat/6 37768 37392 631.9MB/s cp +1.0% + BM_UFlat/7 18585 18200 588.2MB/s c +2.1% + BM_UFlat/8 5751 5690 627.7MB/s lsp +1.1% + BM_UFlat/9 1543154 1542209 641.4MB/s xls +0.1% + BM_UFlat/10 381 388 494.6MB/s xls_200 -1.8% + BM_UFlat/11 339715 331973 440.1MB/s txt1 +2.3% + BM_UFlat/12 294807 289418 415.4MB/s txt2 +1.9% + BM_UFlat/13 906160 884094 463.3MB/s txt3 +2.5% + BM_UFlat/14 1224221 1198435 386.1MB/s txt4 +2.2% + BM_UFlat/15 516277 502923 979.5MB/s bin +2.7% + BM_UFlat/16 405 402 477.2MB/s bin_200 +0.7% + BM_UFlat/17 61640 60621 605.6MB/s sum +1.7% + BM_UFlat/18 7326 7383 549.5MB/s man -0.8% + BM_UFlat/19 94720 92653 1.2GB/s pb +2.2% + BM_UFlat/20 360435 346687 510.6MB/s gaviota +4.0% + Sum of all benchmarks 6944998 6828663 +1.7% + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@77 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 328aafa1980824a9afdcd50edc30d9d5157e417f +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Thu Jun 13 16:19:52 2013 +0000 + + Add support for uncompressing to iovecs (scatter I/O). + Windows does not have struct iovec defined anywhere, + so we define our own version that's equal to what UNIX + typically has. + + The bulk of this patch was contributed by Mohit Aron. + + R=jeff + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@76 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit cd92eb0852e2339187b693eef3595a07d2276c1d +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Jun 12 19:51:15 2013 +0000 + + Some code reorganization needed for an internal change. + + R=fikes + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@75 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit a3e928d62bbd61b523b988c07b560253950cf73b +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Tue Apr 9 15:33:30 2013 +0000 + + Supports truncated test data in zippy benchmark. + + R=sesse + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@74 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit bde324c0169763688f35ee44630a26ad1f49eec3 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Tue Feb 5 14:36:15 2013 +0000 + + Release Snappy 1.1.0. + + R=sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@73 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 8168446c7eaaa0594e1f4ca923376dcf3a2846fa +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Tue Feb 5 14:30:05 2013 +0000 + + Make ./snappy_unittest pass without "srcdir" being defined. + + Previously, snappy_unittests would read from an absolute path /testdata/..; + convert it to use a relative path instead. + + Patch from Marc-Antonie Ruel. + + R=maruel + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@72 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 27a0cc394950ebdad2e8d67322f0862835b10bd9 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Fri Jan 18 12:16:36 2013 +0000 + + Increase the Zippy block size from 32 kB to 64 kB, winning ~3% density + while being effectively performance neutral. + + The longer story about density is that we win 3-6% density on the benchmarks + where this has any effect at all; many of the benchmarks (cp, c, lsp, man) + are smaller than 32 kB and thus will have no effect. Binary data also seems + to win little or nothing; of course, the already-compressed data wins nothing. + The protobuf benchmark wins as much as ~18% depending on architecture, + but I wouldn't be too sure that this is representative of protobuf data in + general. + + As of performance, we lose a tiny amount since we get more tags (e.g., a long + literal might be broken up into literal-copy-literal), but we win it back with + less clearing of the hash table, and more opportunities to skip incompressible + data (e.g. in the jpg benchmark). Decompression seems to get ever so slightly + slower, again due to more tags. The total net change is about as close to zero + as we can get, so the end effect seems to be simply more density and no + real performance change. + + The comment about not changing kBlockSize, scary as it is, is not really + relevant, since we're never going to have a block-level decompressor without + explicitly marked blocks. Replace it with something more appropriate. + + This affects the framing format, but it's okay to change it since it basically + has no users yet. + + + Density (note that cp, c, lsp and man are all smaller than 32 kB): + + Benchmark Description Base (%) New (%) Improvement + -------------------------------------------------------------- + ZFlat/0 html 22.57 22.31 +5.6% + ZFlat/1 urls 50.89 47.77 +6.5% + ZFlat/2 jpg 99.88 99.87 +0.0% + ZFlat/3 pdf 82.13 82.07 +0.1% + ZFlat/4 html4 23.55 22.51 +4.6% + ZFlat/5 cp 48.12 48.12 +0.0% + ZFlat/6 c 42.40 42.40 +0.0% + ZFlat/7 lsp 48.37 48.37 +0.0% + ZFlat/8 xls 41.34 41.23 +0.3% + ZFlat/9 txt1 59.81 57.87 +3.4% + ZFlat/10 txt2 64.07 61.93 +3.5% + ZFlat/11 txt3 57.11 54.92 +4.0% + ZFlat/12 txt4 68.35 66.22 +3.2% + ZFlat/13 bin 18.21 18.11 +0.6% + ZFlat/14 sum 51.88 48.96 +6.0% + ZFlat/15 man 59.36 59.36 +0.0% + ZFlat/16 pb 23.15 19.64 +17.9% + ZFlat/17 gaviota 38.27 37.72 +1.5% + Geometric mean 45.51 44.15 +3.1% + + + Microbenchmarks (64-bit, opt): + + Westmere 2.8 GHz: + + Benchmark Base (ns) New (ns) Improvement + ------------------------------------------------------------------------------------------------- + BM_UFlat/0 75342 75027 1.3GB/s html +0.4% + BM_UFlat/1 723767 744269 899.6MB/s urls -2.8% + BM_UFlat/2 10072 10072 11.7GB/s jpg +0.0% + BM_UFlat/3 30747 30388 2.9GB/s pdf +1.2% + BM_UFlat/4 307353 306063 1.2GB/s html4 +0.4% + BM_UFlat/5 28593 28743 816.3MB/s cp -0.5% + BM_UFlat/6 12958 12998 818.1MB/s c -0.3% + BM_UFlat/7 3700 3792 935.8MB/s lsp -2.4% + BM_UFlat/8 999685 999905 982.1MB/s xls -0.0% + BM_UFlat/9 232954 230079 630.4MB/s txt1 +1.2% + BM_UFlat/10 200785 201468 592.6MB/s txt2 -0.3% + BM_UFlat/11 617267 610968 666.1MB/s txt3 +1.0% + BM_UFlat/12 821595 822475 558.7MB/s txt4 -0.1% + BM_UFlat/13 377097 377632 1.3GB/s bin -0.1% + BM_UFlat/14 45476 45260 805.8MB/s sum +0.5% + BM_UFlat/15 4985 5003 805.7MB/s man -0.4% + BM_UFlat/16 80813 77494 1.4GB/s pb +4.3% + BM_UFlat/17 251792 241553 727.7MB/s gaviota +4.2% + BM_UValidate/0 40343 40354 2.4GB/s html -0.0% + BM_UValidate/1 426890 451574 1.4GB/s urls -5.5% + BM_UValidate/2 187 179 661.9GB/s jpg +4.5% + BM_UValidate/3 13783 13827 6.4GB/s pdf -0.3% + BM_UValidate/4 162393 163335 2.3GB/s html4 -0.6% + BM_UDataBuffer/0 93756 93302 1046.7MB/s html +0.5% + BM_UDataBuffer/1 886714 916292 730.7MB/s urls -3.2% + BM_UDataBuffer/2 15861 16401 7.2GB/s jpg -3.3% + BM_UDataBuffer/3 38934 39224 2.2GB/s pdf -0.7% + BM_UDataBuffer/4 381008 379428 1029.5MB/s html4 +0.4% + BM_UCord/0 92528 91098 1072.0MB/s html +1.6% + BM_UCord/1 858421 885287 756.3MB/s urls -3.0% + BM_UCord/2 13140 13464 8.8GB/s jpg -2.4% + BM_UCord/3 39012 37773 2.3GB/s pdf +3.3% + BM_UCord/4 376869 371267 1052.1MB/s html4 +1.5% + BM_UCordString/0 75810 75303 1.3GB/s html +0.7% + BM_UCordString/1 735290 753841 888.2MB/s urls -2.5% + BM_UCordString/2 11945 13113 9.0GB/s jpg -8.9% + BM_UCordString/3 33901 32562 2.7GB/s pdf +4.1% + BM_UCordString/4 310985 309390 1.2GB/s html4 +0.5% + BM_UCordValidate/0 40952 40450 2.4GB/s html +1.2% + BM_UCordValidate/1 433842 456531 1.4GB/s urls -5.0% + BM_UCordValidate/2 1179 1173 100.8GB/s jpg +0.5% + BM_UCordValidate/3 14481 14392 6.1GB/s pdf +0.6% + BM_UCordValidate/4 164364 164151 2.3GB/s html4 +0.1% + BM_ZFlat/0 160610 156601 623.6MB/s html (22.31 %) +2.6% + BM_ZFlat/1 1995238 1993582 335.9MB/s urls (47.77 %) +0.1% + BM_ZFlat/2 30133 24983 4.7GB/s jpg (99.87 %) +20.6% + BM_ZFlat/3 74453 73128 1.2GB/s pdf (82.07 %) +1.8% + BM_ZFlat/4 647674 633729 616.4MB/s html4 (22.51 %) +2.2% + BM_ZFlat/5 76259 76090 308.4MB/s cp (48.12 %) +0.2% + BM_ZFlat/6 31106 31084 342.1MB/s c (42.40 %) +0.1% + BM_ZFlat/7 10507 10443 339.8MB/s lsp (48.37 %) +0.6% + BM_ZFlat/8 1811047 1793325 547.6MB/s xls (41.23 %) +1.0% + BM_ZFlat/9 597903 581793 249.3MB/s txt1 (57.87 %) +2.8% + BM_ZFlat/10 525320 514522 232.0MB/s txt2 (61.93 %) +2.1% + BM_ZFlat/11 1596591 1551636 262.3MB/s txt3 (54.92 %) +2.9% + BM_ZFlat/12 2134523 2094033 219.5MB/s txt4 (66.22 %) +1.9% + BM_ZFlat/13 593024 587869 832.6MB/s bin (18.11 %) +0.9% + BM_ZFlat/14 114746 110666 329.5MB/s sum (48.96 %) +3.7% + BM_ZFlat/15 14376 14485 278.3MB/s man (59.36 %) -0.8% + BM_ZFlat/16 167908 150070 753.6MB/s pb (19.64 %) +11.9% + BM_ZFlat/17 460228 442253 397.5MB/s gaviota (37.72 %) +4.1% + BM_ZCord/0 164896 160241 609.4MB/s html +2.9% + BM_ZCord/1 2070239 2043492 327.7MB/s urls +1.3% + BM_ZCord/2 54402 47002 2.5GB/s jpg +15.7% + BM_ZCord/3 85871 83832 1073.1MB/s pdf +2.4% + BM_ZCord/4 664078 648825 602.0MB/s html4 +2.4% + BM_ZDataBuffer/0 174874 172549 566.0MB/s html +1.3% + BM_ZDataBuffer/1 2134410 2139173 313.0MB/s urls -0.2% + BM_ZDataBuffer/2 71911 69551 1.7GB/s jpg +3.4% + BM_ZDataBuffer/3 98236 99727 902.1MB/s pdf -1.5% + BM_ZDataBuffer/4 710776 699104 558.8MB/s html4 +1.7% + Sum of all benchmarks 27358908 27200688 +0.6% + + + Sandy Bridge 2.6 GHz: + + Benchmark Base (ns) New (ns) Improvement + ------------------------------------------------------------------------------------------------- + BM_UFlat/0 49356 49018 1.9GB/s html +0.7% + BM_UFlat/1 516764 531955 1.2GB/s urls -2.9% + BM_UFlat/2 6982 7304 16.2GB/s jpg -4.4% + BM_UFlat/3 15285 15598 5.6GB/s pdf -2.0% + BM_UFlat/4 206557 206669 1.8GB/s html4 -0.1% + BM_UFlat/5 13681 13567 1.7GB/s cp +0.8% + BM_UFlat/6 6571 6592 1.6GB/s c -0.3% + BM_UFlat/7 2008 1994 1.7GB/s lsp +0.7% + BM_UFlat/8 775700 773286 1.2GB/s xls +0.3% + BM_UFlat/9 165578 164480 881.8MB/s txt1 +0.7% + BM_UFlat/10 143707 144139 828.2MB/s txt2 -0.3% + BM_UFlat/11 443026 436281 932.8MB/s txt3 +1.5% + BM_UFlat/12 603129 595856 771.2MB/s txt4 +1.2% + BM_UFlat/13 271682 270450 1.8GB/s bin +0.5% + BM_UFlat/14 26200 25666 1.4GB/s sum +2.1% + BM_UFlat/15 2620 2608 1.5GB/s man +0.5% + BM_UFlat/16 48908 47756 2.3GB/s pb +2.4% + BM_UFlat/17 174638 170346 1031.9MB/s gaviota +2.5% + BM_UValidate/0 31922 31898 3.0GB/s html +0.1% + BM_UValidate/1 341265 363554 1.8GB/s urls -6.1% + BM_UValidate/2 160 151 782.8GB/s jpg +6.0% + BM_UValidate/3 10402 10380 8.5GB/s pdf +0.2% + BM_UValidate/4 129490 130587 2.9GB/s html4 -0.8% + BM_UDataBuffer/0 59383 58736 1.6GB/s html +1.1% + BM_UDataBuffer/1 619222 637786 1049.8MB/s urls -2.9% + BM_UDataBuffer/2 10775 11941 9.9GB/s jpg -9.8% + BM_UDataBuffer/3 18002 17930 4.9GB/s pdf +0.4% + BM_UDataBuffer/4 259182 259306 1.5GB/s html4 -0.0% + BM_UCord/0 59379 57814 1.6GB/s html +2.7% + BM_UCord/1 598456 615162 1088.4MB/s urls -2.7% + BM_UCord/2 8519 8628 13.7GB/s jpg -1.3% + BM_UCord/3 18123 17537 5.0GB/s pdf +3.3% + BM_UCord/4 252375 252331 1.5GB/s html4 +0.0% + BM_UCordString/0 49494 49790 1.9GB/s html -0.6% + BM_UCordString/1 524659 541803 1.2GB/s urls -3.2% + BM_UCordString/2 8206 8354 14.2GB/s jpg -1.8% + BM_UCordString/3 17235 16537 5.3GB/s pdf +4.2% + BM_UCordString/4 210188 211072 1.8GB/s html4 -0.4% + BM_UCordValidate/0 31956 31587 3.0GB/s html +1.2% + BM_UCordValidate/1 340828 362141 1.8GB/s urls -5.9% + BM_UCordValidate/2 783 744 158.9GB/s jpg +5.2% + BM_UCordValidate/3 10543 10462 8.4GB/s pdf +0.8% + BM_UCordValidate/4 130150 129789 2.9GB/s html4 +0.3% + BM_ZFlat/0 113873 111200 878.2MB/s html (22.31 %) +2.4% + BM_ZFlat/1 1473023 1489858 449.4MB/s urls (47.77 %) -1.1% + BM_ZFlat/2 23569 19486 6.1GB/s jpg (99.87 %) +21.0% + BM_ZFlat/3 49178 48046 1.8GB/s pdf (82.07 %) +2.4% + BM_ZFlat/4 475063 469394 832.2MB/s html4 (22.51 %) +1.2% + BM_ZFlat/5 46910 46816 501.2MB/s cp (48.12 %) +0.2% + BM_ZFlat/6 16883 16916 628.6MB/s c (42.40 %) -0.2% + BM_ZFlat/7 5381 5447 651.5MB/s lsp (48.37 %) -1.2% + BM_ZFlat/8 1466870 1473861 666.3MB/s xls (41.23 %) -0.5% + BM_ZFlat/9 468006 464101 312.5MB/s txt1 (57.87 %) +0.8% + BM_ZFlat/10 408157 408957 291.9MB/s txt2 (61.93 %) -0.2% + BM_ZFlat/11 1253348 1232910 330.1MB/s txt3 (54.92 %) +1.7% + BM_ZFlat/12 1702373 1702977 269.8MB/s txt4 (66.22 %) -0.0% + BM_ZFlat/13 439792 438557 1116.0MB/s bin (18.11 %) +0.3% + BM_ZFlat/14 80766 78851 462.5MB/s sum (48.96 %) +2.4% + BM_ZFlat/15 7420 7542 534.5MB/s man (59.36 %) -1.6% + BM_ZFlat/16 112043 100126 1.1GB/s pb (19.64 %) +11.9% + BM_ZFlat/17 368877 357703 491.4MB/s gaviota (37.72 %) +3.1% + BM_ZCord/0 116402 113564 859.9MB/s html +2.5% + BM_ZCord/1 1507156 1519911 440.5MB/s urls -0.8% + BM_ZCord/2 39860 33686 3.5GB/s jpg +18.3% + BM_ZCord/3 56211 54694 1.6GB/s pdf +2.8% + BM_ZCord/4 485594 479212 815.1MB/s html4 +1.3% + BM_ZDataBuffer/0 123185 121572 803.3MB/s html +1.3% + BM_ZDataBuffer/1 1569111 1589380 421.3MB/s urls -1.3% + BM_ZDataBuffer/2 53143 49556 2.4GB/s jpg +7.2% + BM_ZDataBuffer/3 65725 66826 1.3GB/s pdf -1.6% + BM_ZDataBuffer/4 517871 514750 758.9MB/s html4 +0.6% + Sum of all benchmarks 20258879 20315484 -0.3% + + + AMD Instanbul 2.4 GHz: + + Benchmark Base (ns) New (ns) Improvement + ------------------------------------------------------------------------------------------------- + BM_UFlat/0 97120 96585 1011.1MB/s html +0.6% + BM_UFlat/1 917473 948016 706.3MB/s urls -3.2% + BM_UFlat/2 21496 23938 4.9GB/s jpg -10.2% + BM_UFlat/3 44751 45639 1.9GB/s pdf -1.9% + BM_UFlat/4 391950 391413 998.0MB/s html4 +0.1% + BM_UFlat/5 37366 37201 630.7MB/s cp +0.4% + BM_UFlat/6 18350 18318 580.5MB/s c +0.2% + BM_UFlat/7 5672 5661 626.9MB/s lsp +0.2% + BM_UFlat/8 1533390 1529441 642.1MB/s xls +0.3% + BM_UFlat/9 335477 336553 431.0MB/s txt1 -0.3% + BM_UFlat/10 285140 292080 408.7MB/s txt2 -2.4% + BM_UFlat/11 888507 894758 454.9MB/s txt3 -0.7% + BM_UFlat/12 1187643 1210928 379.5MB/s txt4 -1.9% + BM_UFlat/13 493717 507447 964.5MB/s bin -2.7% + BM_UFlat/14 61740 60870 599.1MB/s sum +1.4% + BM_UFlat/15 7211 7187 560.9MB/s man +0.3% + BM_UFlat/16 97435 93100 1.2GB/s pb +4.7% + BM_UFlat/17 362662 356395 493.2MB/s gaviota +1.8% + BM_UValidate/0 47475 47118 2.0GB/s html +0.8% + BM_UValidate/1 501304 529741 1.2GB/s urls -5.4% + BM_UValidate/2 276 243 486.2GB/s jpg +13.6% + BM_UValidate/3 16361 16261 5.4GB/s pdf +0.6% + BM_UValidate/4 190741 190353 2.0GB/s html4 +0.2% + BM_UDataBuffer/0 111080 109771 889.6MB/s html +1.2% + BM_UDataBuffer/1 1051035 1085999 616.5MB/s urls -3.2% + BM_UDataBuffer/2 25801 25463 4.6GB/s jpg +1.3% + BM_UDataBuffer/3 50493 49946 1.8GB/s pdf +1.1% + BM_UDataBuffer/4 447258 444138 879.5MB/s html4 +0.7% + BM_UCord/0 109350 107909 905.0MB/s html +1.3% + BM_UCord/1 1023396 1054964 634.7MB/s urls -3.0% + BM_UCord/2 25292 24371 4.9GB/s jpg +3.8% + BM_UCord/3 48955 49736 1.8GB/s pdf -1.6% + BM_UCord/4 440452 437331 893.2MB/s html4 +0.7% + BM_UCordString/0 98511 98031 996.2MB/s html +0.5% + BM_UCordString/1 933230 963495 694.9MB/s urls -3.1% + BM_UCordString/2 23311 24076 4.9GB/s jpg -3.2% + BM_UCordString/3 45568 46196 1.9GB/s pdf -1.4% + BM_UCordString/4 397791 396934 984.1MB/s html4 +0.2% + BM_UCordValidate/0 47537 46921 2.0GB/s html +1.3% + BM_UCordValidate/1 505071 532716 1.2GB/s urls -5.2% + BM_UCordValidate/2 1663 1621 72.9GB/s jpg +2.6% + BM_UCordValidate/3 16890 16926 5.2GB/s pdf -0.2% + BM_UCordValidate/4 192365 191984 2.0GB/s html4 +0.2% + BM_ZFlat/0 184708 179103 545.3MB/s html (22.31 %) +3.1% + BM_ZFlat/1 2293864 2302950 290.7MB/s urls (47.77 %) -0.4% + BM_ZFlat/2 52852 47618 2.5GB/s jpg (99.87 %) +11.0% + BM_ZFlat/3 100766 96179 935.3MB/s pdf (82.07 %) +4.8% + BM_ZFlat/4 741220 727977 536.6MB/s html4 (22.51 %) +1.8% + BM_ZFlat/5 85402 85418 274.7MB/s cp (48.12 %) -0.0% + BM_ZFlat/6 36558 36494 291.4MB/s c (42.40 %) +0.2% + BM_ZFlat/7 12706 12507 283.7MB/s lsp (48.37 %) +1.6% + BM_ZFlat/8 2336823 2335688 420.5MB/s xls (41.23 %) +0.0% + BM_ZFlat/9 701804 681153 212.9MB/s txt1 (57.87 %) +3.0% + BM_ZFlat/10 606700 597194 199.9MB/s txt2 (61.93 %) +1.6% + BM_ZFlat/11 1852283 1803238 225.7MB/s txt3 (54.92 %) +2.7% + BM_ZFlat/12 2475527 2443354 188.1MB/s txt4 (66.22 %) +1.3% + BM_ZFlat/13 694497 696654 702.6MB/s bin (18.11 %) -0.3% + BM_ZFlat/14 136929 129855 280.8MB/s sum (48.96 %) +5.4% + BM_ZFlat/15 17172 17124 235.4MB/s man (59.36 %) +0.3% + BM_ZFlat/16 190364 171763 658.4MB/s pb (19.64 %) +10.8% + BM_ZFlat/17 567285 555190 316.6MB/s gaviota (37.72 %) +2.2% + BM_ZCord/0 193490 187031 522.1MB/s html +3.5% + BM_ZCord/1 2427537 2415315 277.2MB/s urls +0.5% + BM_ZCord/2 85378 81412 1.5GB/s jpg +4.9% + BM_ZCord/3 121898 119419 753.3MB/s pdf +2.1% + BM_ZCord/4 779564 762961 512.0MB/s html4 +2.2% + BM_ZDataBuffer/0 213820 207272 471.1MB/s html +3.2% + BM_ZDataBuffer/1 2589010 2586495 258.9MB/s urls +0.1% + BM_ZDataBuffer/2 121871 118885 1018.4MB/s jpg +2.5% + BM_ZDataBuffer/3 145382 145986 616.2MB/s pdf -0.4% + BM_ZDataBuffer/4 868117 852754 458.1MB/s html4 +1.8% + Sum of all benchmarks 33771833 33744763 +0.1% + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@71 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 81f34784b7b812dcda956ee489dfdc74ec2da990 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Sun Jan 6 19:21:26 2013 +0000 + + Adjust the Snappy open-source distribution for the changes in Google's + internal file API. + + R=sanjay + + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@70 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 698af469b47fe809905e2ed173ad84241de5800f +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Fri Jan 4 11:54:20 2013 +0000 + + Change a few ORs to additions where they don't matter. This helps the compiler + use the LEA instruction more efficiently, since e.g. a + (b << 2) can be encoded + as one instruction. Even more importantly, it can constant-fold the + COPY_* enums together with the shifted negative constants, which also saves + some instructions. (We don't need it for LITERAL, since it happens to be 0.) + + I am unsure why the compiler couldn't do this itself, but the theory is that + it cannot prove that len-1 and len-4 cannot underflow/wrap, and thus can't + do the optimization safely. + + The gains are small but measurable; 0.5-1.0% over the BM_Z* benchmarks + (measured on Westmere, Sandy Bridge and Istanbul). + + R=sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@69 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 55209f9b92efd97e0a61be28ed94210de04c3bfc +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Mon Oct 8 11:37:16 2012 +0000 + + Stop giving -Werror to automake, due to an incompatibility between current + versions of libtool and automake on non-GNU platforms (e.g. Mac OS X). + + R=sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@68 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit b86e81c8b3426a62d8ab3a7674c2506e9e678740 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Fri Aug 17 13:54:47 2012 +0000 + + Fix public issue 66: Document GetUncompressedLength better, in particular that + it leaves the source in a state that's not appropriate for RawUncompress. + + R=sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@67 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 2e225ba821b420ae28e1d427075d5589c1e892d9 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Tue Jul 31 11:44:44 2012 +0000 + + Fix public issue 64: Check for <sys/time.h> at configure time, + since MSVC seemingly does not have it. + + R=sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@66 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit e89f20ab46ee11050760c6d57f05c2a3825a911c +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Jul 4 09:34:48 2012 +0000 + + Handle the case where gettimeofday() goes backwards or returns the same value + twice; it could cause division by zero in the unit test framework. + (We already had one fix for this in place, but it was incomplete.) + + This could in theory happen on any system, since there are few guarantees + about gettimeofday(), but seems to only happen in practice on GNU/Hurd, where + gettimeofday() is cached and only updated ever so often. + + R=sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@65 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 3ec60ac9878de5d0317ad38fc545080a4bfaa74f +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Jul 4 09:28:33 2012 +0000 + + Mark ARMv4 as not supporting unaligned accesses (not just ARMv5 and ARMv6); + apparently Debian still targets these by default, giving us segfaults on + armel. + + R=sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@64 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit be80d6f74f9d82220e952a54f3f129aae1f13f95 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Tue May 22 09:46:05 2012 +0000 + + Fix public bug #62: Remove an extraneous comma at the end of an enum list, + causing compile errors when embedded in Mozilla on OpenBSD. + + R=sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@63 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 8b95464146dddab1c7068f879162db9a885cdafe +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Tue May 22 09:32:50 2012 +0000 + + Snappy library no longer depends on iostream. + + Achieved by moving logging macro definitions to a test-only + header file, and by changing non-test code to use assert, + fprintf, and abort instead of LOG/CHECK macros. + + R=sesse + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@62 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit fc723b212d6972af7051261754770b3f70a7dc03 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Fri Feb 24 15:46:37 2012 +0000 + + Release Snappy 1.0.5. + + R=sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@61 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit dc63e0ad9693e13390ba31b00d92ecccaf7605c3 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Thu Feb 23 17:00:36 2012 +0000 + + For 32-bit platforms, do not try to accelerate multiple neighboring + 32-bit loads with a 64-bit load during compression (it's not a win). + + The main target for this optimization is ARM, but 32-bit x86 gets + a small gain, too, although there is noise in the microbenchmarks. + It's a no-op for 64-bit x86. It does not affect decompression. + + Microbenchmark results on a Cortex-A9 1GHz, using g++ 4.6.2 (from + Ubuntu/Linaro), -O2 -DNDEBUG -Wa,-march=armv7a -mtune=cortex-a9 + -mthumb-interwork, minimum 1000 iterations: + + Benchmark Time(ns) CPU(ns) Iterations + --------------------------------------------------- + BM_ZFlat/0 1158277 1160000 1000 84.2MB/s html (23.57 %) [ +4.3%] + BM_ZFlat/1 14861782 14860000 1000 45.1MB/s urls (50.89 %) [ +1.1%] + BM_ZFlat/2 393595 390000 1000 310.5MB/s jpg (99.88 %) [ +0.0%] + BM_ZFlat/3 650583 650000 1000 138.4MB/s pdf (82.13 %) [ +3.1%] + BM_ZFlat/4 4661480 4660000 1000 83.8MB/s html4 (23.55 %) [ +4.3%] + BM_ZFlat/5 491973 490000 1000 47.9MB/s cp (48.12 %) [ +2.0%] + BM_ZFlat/6 193575 192678 1038 55.2MB/s c (42.40 %) [ +9.0%] + BM_ZFlat/7 62343 62754 3187 56.5MB/s lsp (48.37 %) [ +2.6%] + BM_ZFlat/8 17708468 17710000 1000 55.5MB/s xls (41.34 %) [ -0.3%] + BM_ZFlat/9 3755345 3760000 1000 38.6MB/s txt1 (59.81 %) [ +8.2%] + BM_ZFlat/10 3324217 3320000 1000 36.0MB/s txt2 (64.07 %) [ +4.2%] + BM_ZFlat/11 10139932 10140000 1000 40.1MB/s txt3 (57.11 %) [ +6.4%] + BM_ZFlat/12 13532109 13530000 1000 34.0MB/s txt4 (68.35 %) [ +5.0%] + BM_ZFlat/13 4690847 4690000 1000 104.4MB/s bin (18.21 %) [ +4.1%] + BM_ZFlat/14 830682 830000 1000 43.9MB/s sum (51.88 %) [ +1.2%] + BM_ZFlat/15 84784 85011 2235 47.4MB/s man (59.36 %) [ +1.1%] + BM_ZFlat/16 1293254 1290000 1000 87.7MB/s pb (23.15 %) [ +2.3%] + BM_ZFlat/17 2775155 2780000 1000 63.2MB/s gaviota (38.27 %) [+12.2%] + + Core i7 in 32-bit mode (only one run and 100 iterations, though, so noisy): + + Benchmark Time(ns) CPU(ns) Iterations + --------------------------------------------------- + BM_ZFlat/0 227582 223464 3043 437.0MB/s html (23.57 %) [ +7.4%] + BM_ZFlat/1 2982430 2918455 233 229.4MB/s urls (50.89 %) [ +2.9%] + BM_ZFlat/2 46967 46658 15217 2.5GB/s jpg (99.88 %) [ +0.0%] + BM_ZFlat/3 115298 114864 5833 783.2MB/s pdf (82.13 %) [ +1.5%] + BM_ZFlat/4 913440 899743 778 434.2MB/s html4 (23.55 %) [ +0.3%] + BM_ZFlat/5 110302 108571 7000 216.1MB/s cp (48.12 %) [ +0.0%] + BM_ZFlat/6 44409 43372 15909 245.2MB/s c (42.40 %) [ +0.8%] + BM_ZFlat/7 15713 15643 46667 226.9MB/s lsp (48.37 %) [ +2.7%] + BM_ZFlat/8 2625539 2602230 269 377.4MB/s xls (41.34 %) [ +1.4%] + BM_ZFlat/9 808884 811429 875 178.8MB/s txt1 (59.81 %) [ -3.9%] + BM_ZFlat/10 709532 700000 1000 170.5MB/s txt2 (64.07 %) [ +0.0%] + BM_ZFlat/11 2177682 2162162 333 188.2MB/s txt3 (57.11 %) [ -1.4%] + BM_ZFlat/12 2849640 2840000 250 161.8MB/s txt4 (68.35 %) [ -1.4%] + BM_ZFlat/13 849760 835476 778 585.8MB/s bin (18.21 %) [ +1.2%] + BM_ZFlat/14 165940 164571 4375 221.6MB/s sum (51.88 %) [ +1.4%] + BM_ZFlat/15 20939 20571 35000 196.0MB/s man (59.36 %) [ +2.1%] + BM_ZFlat/16 239209 236544 2917 478.1MB/s pb (23.15 %) [ +4.2%] + BM_ZFlat/17 616206 610000 1000 288.2MB/s gaviota (38.27 %) [ -1.6%] + + R=sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@60 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit f8829ea39d51432ba4e6a26ddaec57acea779f4c +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Tue Feb 21 17:02:17 2012 +0000 + + Enable the use of unaligned loads and stores for ARM-based architectures + where they are available (ARMv7 and higher). This gives a significant + speed boost on ARM, both for compression and decompression. + It should not affect x86 at all. + + There are more changes possible to speed up ARM, but it might not be + that easy to do without hurting x86 or making the code uglier. + Also, we de not try to use NEON yet. + + Microbenchmark results on a Cortex-A9 1GHz, using g++ 4.6.2 (from Ubuntu/Linaro), + -O2 -DNDEBUG -Wa,-march=armv7a -mtune=cortex-a9 -mthumb-interwork: + + Benchmark Time(ns) CPU(ns) Iterations + --------------------------------------------------- + BM_UFlat/0 524806 529100 378 184.6MB/s html [+33.6%] + BM_UFlat/1 5139790 5200000 100 128.8MB/s urls [+28.8%] + BM_UFlat/2 86540 84166 1901 1.4GB/s jpg [ +0.6%] + BM_UFlat/3 215351 210176 904 428.0MB/s pdf [+29.8%] + BM_UFlat/4 2144490 2100000 100 186.0MB/s html4 [+33.3%] + BM_UFlat/5 194482 190000 1000 123.5MB/s cp [+36.2%] + BM_UFlat/6 91843 90175 2107 117.9MB/s c [+38.6%] + BM_UFlat/7 28535 28426 6684 124.8MB/s lsp [+34.7%] + BM_UFlat/8 9206600 9200000 100 106.7MB/s xls [+42.4%] + BM_UFlat/9 1865273 1886792 106 76.9MB/s txt1 [+32.5%] + BM_UFlat/10 1576809 1587301 126 75.2MB/s txt2 [+32.3%] + BM_UFlat/11 4968450 4900000 100 83.1MB/s txt3 [+32.7%] + BM_UFlat/12 6673970 6700000 100 68.6MB/s txt4 [+32.8%] + BM_UFlat/13 2391470 2400000 100 203.9MB/s bin [+29.2%] + BM_UFlat/14 334601 344827 522 105.8MB/s sum [+30.6%] + BM_UFlat/15 37404 38080 5252 105.9MB/s man [+33.8%] + BM_UFlat/16 535470 540540 370 209.2MB/s pb [+31.2%] + BM_UFlat/17 1875245 1886792 106 93.2MB/s gaviota [+37.8%] + BM_UValidate/0 178425 179533 1114 543.9MB/s html [ +2.7%] + BM_UValidate/1 2100450 2000000 100 334.8MB/s urls [ +5.0%] + BM_UValidate/2 1039 1044 172413 113.3GB/s jpg [ +3.4%] + BM_UValidate/3 59423 59470 3363 1.5GB/s pdf [ +7.8%] + BM_UValidate/4 760716 766283 261 509.8MB/s html4 [ +6.5%] + BM_ZFlat/0 1204632 1204819 166 81.1MB/s html (23.57 %) [+32.8%] + BM_ZFlat/1 15656190 15600000 100 42.9MB/s urls (50.89 %) [+27.6%] + BM_ZFlat/2 403336 410677 487 294.8MB/s jpg (99.88 %) [+16.5%] + BM_ZFlat/3 664073 671140 298 134.0MB/s pdf (82.13 %) [+28.4%] + BM_ZFlat/4 4961940 4900000 100 79.7MB/s html4 (23.55 %) [+30.6%] + BM_ZFlat/5 500664 501253 399 46.8MB/s cp (48.12 %) [+33.4%] + BM_ZFlat/6 217276 215982 926 49.2MB/s c (42.40 %) [+25.0%] + BM_ZFlat/7 64122 65487 3054 54.2MB/s lsp (48.37 %) [+36.1%] + BM_ZFlat/8 18045730 18000000 100 54.6MB/s xls (41.34 %) [+34.4%] + BM_ZFlat/9 4051530 4000000 100 36.3MB/s txt1 (59.81 %) [+25.0%] + BM_ZFlat/10 3451800 3500000 100 34.1MB/s txt2 (64.07 %) [+25.7%] + BM_ZFlat/11 11052340 11100000 100 36.7MB/s txt3 (57.11 %) [+24.3%] + BM_ZFlat/12 14538690 14600000 100 31.5MB/s txt4 (68.35 %) [+24.7%] + BM_ZFlat/13 5041850 5000000 100 97.9MB/s bin (18.21 %) [+32.0%] + BM_ZFlat/14 908840 909090 220 40.1MB/s sum (51.88 %) [+22.2%] + BM_ZFlat/15 86921 86206 1972 46.8MB/s man (59.36 %) [+42.2%] + BM_ZFlat/16 1312315 1315789 152 86.0MB/s pb (23.15 %) [+34.5%] + BM_ZFlat/17 3173120 3200000 100 54.9MB/s gaviota (38.27%) [+28.1%] + + + The move from 64-bit to 32-bit operations for the copies also affected 32-bit x86; + positive on the decompression side, and slightly negative on the compression side + (unless that is noise; I only ran once): + + Benchmark Time(ns) CPU(ns) Iterations + ----------------------------------------------------- + BM_UFlat/0 86279 86140 7778 1.1GB/s html [ +7.5%] + BM_UFlat/1 839265 822622 778 813.9MB/s urls [ +9.4%] + BM_UFlat/2 9180 9143 87500 12.9GB/s jpg [ +1.2%] + BM_UFlat/3 35080 35000 20000 2.5GB/s pdf [+10.1%] + BM_UFlat/4 350318 345000 2000 1.1GB/s html4 [ +7.0%] + BM_UFlat/5 33808 33472 21212 701.0MB/s cp [ +9.0%] + BM_UFlat/6 15201 15214 46667 698.9MB/s c [+14.9%] + BM_UFlat/7 4652 4651 159091 762.9MB/s lsp [ +7.5%] + BM_UFlat/8 1285551 1282528 538 765.7MB/s xls [+10.7%] + BM_UFlat/9 282510 281690 2414 514.9MB/s txt1 [+13.6%] + BM_UFlat/10 243494 239286 2800 498.9MB/s txt2 [+14.4%] + BM_UFlat/11 743625 740000 1000 550.0MB/s txt3 [+14.3%] + BM_UFlat/12 999441 989717 778 464.3MB/s txt4 [+16.1%] + BM_UFlat/13 412402 410076 1707 1.2GB/s bin [ +7.3%] + BM_UFlat/14 54876 54000 10000 675.3MB/s sum [+13.0%] + BM_UFlat/15 6146 6100 100000 660.8MB/s man [+14.8%] + BM_UFlat/16 90496 90286 8750 1.2GB/s pb [ +4.0%] + BM_UFlat/17 292650 292000 2500 602.0MB/s gaviota [+18.1%] + BM_UValidate/0 49620 49699 14286 1.9GB/s html [ +0.0%] + BM_UValidate/1 501371 500000 1000 1.3GB/s urls [ +0.0%] + BM_UValidate/2 232 227 3043478 521.5GB/s jpg [ +1.3%] + BM_UValidate/3 17250 17143 43750 5.1GB/s pdf [ -1.3%] + BM_UValidate/4 198643 200000 3500 1.9GB/s html4 [ -0.9%] + BM_ZFlat/0 227128 229415 3182 425.7MB/s html (23.57 %) [ -1.4%] + BM_ZFlat/1 2970089 2960000 250 226.2MB/s urls (50.89 %) [ -1.9%] + BM_ZFlat/2 45683 44999 15556 2.6GB/s jpg (99.88 %) [ +2.2%] + BM_ZFlat/3 114661 113136 6364 795.1MB/s pdf (82.13 %) [ -1.5%] + BM_ZFlat/4 919702 914286 875 427.2MB/s html4 (23.55%) [ -1.3%] + BM_ZFlat/5 108189 108422 6364 216.4MB/s cp (48.12 %) [ -1.2%] + BM_ZFlat/6 44525 44000 15909 241.7MB/s c (42.40 %) [ -2.9%] + BM_ZFlat/7 15973 15857 46667 223.8MB/s lsp (48.37 %) [ +0.0%] + BM_ZFlat/8 2677888 2639405 269 372.1MB/s xls (41.34 %) [ -1.4%] + BM_ZFlat/9 800715 780000 1000 186.0MB/s txt1 (59.81 %) [ -0.4%] + BM_ZFlat/10 700089 700000 1000 170.5MB/s txt2 (64.07 %) [ -2.9%] + BM_ZFlat/11 2159356 2138365 318 190.3MB/s txt3 (57.11 %) [ -0.3%] + BM_ZFlat/12 2796143 2779923 259 165.3MB/s txt4 (68.35 %) [ -1.4%] + BM_ZFlat/13 856458 835476 778 585.8MB/s bin (18.21 %) [ -0.1%] + BM_ZFlat/14 166908 166857 4375 218.6MB/s sum (51.88 %) [ -1.4%] + BM_ZFlat/15 21181 20857 35000 193.3MB/s man (59.36 %) [ -0.8%] + BM_ZFlat/16 244009 239973 2917 471.3MB/s pb (23.15 %) [ -1.4%] + BM_ZFlat/17 596362 590000 1000 297.9MB/s gaviota (38.27%) [ +0.0%] + + R=sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@59 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit f2e184f638bdc7905f26c24faaf10fc0f5d33403 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Sat Feb 11 22:11:22 2012 +0000 + + Lower the size allocated in the "corrupted input" unit test from 256 MB + to 2 MB. This fixes issues with running the unit test on platforms with + little RAM (e.g. some ARM boards). + + Also, reactivate the 2 MB test for 64-bit platforms; there's no good + reason why it shouldn't be. + + R=sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@58 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit e750dc0f054ba74b0ce76dd2013e6728cc7a41c5 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Sun Jan 8 17:55:48 2012 +0000 + + Minor refactoring to accomodate changes in Google's internal code tree. + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@57 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit d9068ee301bdf893a4d8cb7c6518eacc44c4c1f2 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Jan 4 13:10:46 2012 +0000 + + Fix public issue r57: Fix most warnings with -Wall, mostly signed/unsigned + warnings. There are still some in the unit test, but the main .cc file should + be clean. We haven't enabled -Wall for the default build, since the unit test + is still not clean. + + This also fixes a real bug in the open-source implementation of + ReadFileToStringOrDie(); it would not detect errors correctly. + + I had to go through some pains to avoid performance loss as the types + were changed; I think there might still be some with 32-bit if and only if LFS + is enabled (ie., size_t is 64-bit), but for regular 32-bit and 64-bit I can't + see any losses, and I've diffed the generated GCC assembler between the old and + new code without seeing any significant choices. If anything, it's ever so + slightly faster. + + This may or may not enable compression of very large blocks (>2^32 bytes) + when size_t is 64-bit, but I haven't checked, and it is still not a supported + case. + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@56 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 0755c815197dacc77d8971ae917c86d7aa96bf8e +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Jan 4 10:46:39 2012 +0000 + + Add a framing format description. We do not have any implementation of this at + the current point, but there seems to be enough of a general interest in the + topic (cf. public bug #34). + + R=csilvers,sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@55 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit d7eb2dc4133794b62cba691f9be40d1549bc32e2 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Mon Dec 5 21:27:26 2011 +0000 + + Speed up decompression by moving the refill check to the end of the loop. + + This seems to work because in most of the branches, the compiler can evaluate + “ip_limit_ - ip” in a more efficient way than reloading ip_limit_ from memory + (either by already having the entire expression in a register, or reconstructing + it from “avail”, or something else). Memory loads, even from L1, are seemingly + costly in the big picture at the current decompression speeds. + + Microbenchmarks (64-bit, opt mode): + + Westmere (Intel Core i7): + + Benchmark Time(ns) CPU(ns) Iterations + -------------------------------------------- + BM_UFlat/0 74492 74491 187894 1.3GB/s html [ +5.9%] + BM_UFlat/1 712268 712263 19644 940.0MB/s urls [ +3.8%] + BM_UFlat/2 10591 10590 1000000 11.2GB/s jpg [ -6.8%] + BM_UFlat/3 29643 29643 469915 3.0GB/s pdf [ +7.9%] + BM_UFlat/4 304669 304667 45930 1.3GB/s html4 [ +4.8%] + BM_UFlat/5 28508 28507 490077 823.1MB/s cp [ +4.0%] + BM_UFlat/6 12415 12415 1000000 856.5MB/s c [ +8.6%] + BM_UFlat/7 3415 3415 4084723 1039.0MB/s lsp [+18.0%] + BM_UFlat/8 979569 979563 14261 1002.5MB/s xls [ +5.8%] + BM_UFlat/9 230150 230148 60934 630.2MB/s txt1 [ +5.2%] + BM_UFlat/10 197167 197166 71135 605.5MB/s txt2 [ +4.7%] + BM_UFlat/11 607394 607390 23041 670.1MB/s txt3 [ +5.6%] + BM_UFlat/12 808502 808496 17316 568.4MB/s txt4 [ +5.0%] + BM_UFlat/13 372791 372788 37564 1.3GB/s bin [ +3.3%] + BM_UFlat/14 44541 44541 313969 818.8MB/s sum [ +5.7%] + BM_UFlat/15 4833 4833 2898697 834.1MB/s man [ +4.8%] + BM_UFlat/16 79855 79855 175356 1.4GB/s pb [ +4.8%] + BM_UFlat/17 245845 245843 56838 715.0MB/s gaviota [ +5.8%] + + Clovertown (Intel Core 2): + + Benchmark Time(ns) CPU(ns) Iterations + -------------------------------------------- + BM_UFlat/0 107911 107890 100000 905.1MB/s html [ +2.2%] + BM_UFlat/1 1011237 1011041 10000 662.3MB/s urls [ +2.5%] + BM_UFlat/2 26775 26770 523089 4.4GB/s jpg [ +0.0%] + BM_UFlat/3 48103 48095 290618 1.8GB/s pdf [ +3.4%] + BM_UFlat/4 437724 437644 31937 892.6MB/s html4 [ +2.1%] + BM_UFlat/5 39607 39600 358284 592.5MB/s cp [ +2.4%] + BM_UFlat/6 18227 18224 768191 583.5MB/s c [ +2.7%] + BM_UFlat/7 5171 5170 2709437 686.4MB/s lsp [ +3.9%] + BM_UFlat/8 1560291 1559989 8970 629.5MB/s xls [ +3.6%] + BM_UFlat/9 335401 335343 41731 432.5MB/s txt1 [ +3.0%] + BM_UFlat/10 287014 286963 48758 416.0MB/s txt2 [ +2.8%] + BM_UFlat/11 888522 888356 15752 458.1MB/s txt3 [ +2.9%] + BM_UFlat/12 1186600 1186378 10000 387.3MB/s txt4 [ +3.1%] + BM_UFlat/13 572295 572188 24468 855.4MB/s bin [ +2.1%] + BM_UFlat/14 64060 64049 218401 569.4MB/s sum [ +4.1%] + BM_UFlat/15 7264 7263 1916168 555.0MB/s man [ +1.4%] + BM_UFlat/16 108853 108836 100000 1039.1MB/s pb [ +1.7%] + BM_UFlat/17 364289 364223 38419 482.6MB/s gaviota [ +4.9%] + + Barcelona (AMD Opteron): + + Benchmark Time(ns) CPU(ns) Iterations + -------------------------------------------- + BM_UFlat/0 103900 103871 100000 940.2MB/s html [ +8.3%] + BM_UFlat/1 1000435 1000107 10000 669.5MB/s urls [ +6.6%] + BM_UFlat/2 24659 24652 567362 4.8GB/s jpg [ +0.1%] + BM_UFlat/3 48206 48193 291121 1.8GB/s pdf [ +5.0%] + BM_UFlat/4 421980 421850 33174 926.0MB/s html4 [ +7.3%] + BM_UFlat/5 40368 40357 346994 581.4MB/s cp [ +8.7%] + BM_UFlat/6 19836 19830 708695 536.2MB/s c [ +8.0%] + BM_UFlat/7 6100 6098 2292774 581.9MB/s lsp [ +9.0%] + BM_UFlat/8 1693093 1692514 8261 580.2MB/s xls [ +8.0%] + BM_UFlat/9 365991 365886 38225 396.4MB/s txt1 [ +7.1%] + BM_UFlat/10 311330 311238 44950 383.6MB/s txt2 [ +7.6%] + BM_UFlat/11 975037 974737 14376 417.5MB/s txt3 [ +6.9%] + BM_UFlat/12 1303558 1303175 10000 352.6MB/s txt4 [ +7.3%] + BM_UFlat/13 517448 517290 27144 946.2MB/s bin [ +5.5%] + BM_UFlat/14 66537 66518 210352 548.3MB/s sum [ +7.5%] + BM_UFlat/15 7976 7974 1760383 505.6MB/s man [ +5.6%] + BM_UFlat/16 103121 103092 100000 1097.0MB/s pb [ +8.7%] + BM_UFlat/17 391431 391314 35733 449.2MB/s gaviota [ +6.5%] + + R=sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@54 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 5ed51ce15fc4ff8d2f7235704eb6b0c3f762fb88 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Nov 23 11:14:17 2011 +0000 + + Speed up decompression by making the fast path for literals faster. + + We do the fast-path step as soon as possible; in fact, as soon as we know the + literal length. Since we usually hit the fast path, we can then skip the checks + for long literals and available input space (beyond what the fast path check + already does). + + Note that this changes the decompression Writer API; however, it does not + change the ABI, since writers are always templatized and as such never + cross compilation units. The new API is slightly more general, in that it + doesn't hard-code the value 16. Note that we also take care to check + for len <= 16 first, since the other two checks almost always succeed + (so we don't want to waste time checking for them until we have to). + + The improvements are most marked on Nehalem, but are generally positive + on other platforms as well. All microbenchmarks are 64-bit, opt. + + Clovertown (Core 2): + + Benchmark Time(ns) CPU(ns) Iterations + -------------------------------------------- + BM_UFlat/0 110226 110224 100000 886.0MB/s html [ +1.5%] + BM_UFlat/1 1036523 1036508 10000 646.0MB/s urls [ -0.8%] + BM_UFlat/2 26775 26775 522570 4.4GB/s jpg [ +0.0%] + BM_UFlat/3 49738 49737 280974 1.8GB/s pdf [ +0.3%] + BM_UFlat/4 446790 446792 31334 874.3MB/s html4 [ +0.8%] + BM_UFlat/5 40561 40562 350424 578.5MB/s cp [ +1.3%] + BM_UFlat/6 18722 18722 746903 568.0MB/s c [ +1.4%] + BM_UFlat/7 5373 5373 2608632 660.5MB/s lsp [ +8.3%] + BM_UFlat/8 1615716 1615718 8670 607.8MB/s xls [ +2.0%] + BM_UFlat/9 345278 345281 40481 420.1MB/s txt1 [ +1.4%] + BM_UFlat/10 294855 294855 47452 404.9MB/s txt2 [ +1.6%] + BM_UFlat/11 914263 914263 15316 445.2MB/s txt3 [ +1.1%] + BM_UFlat/12 1222694 1222691 10000 375.8MB/s txt4 [ +1.4%] + BM_UFlat/13 584495 584489 23954 837.4MB/s bin [ -0.6%] + BM_UFlat/14 66662 66662 210123 547.1MB/s sum [ +1.2%] + BM_UFlat/15 7368 7368 1881856 547.1MB/s man [ +4.0%] + BM_UFlat/16 110727 110726 100000 1021.4MB/s pb [ +2.3%] + BM_UFlat/17 382138 382141 36616 460.0MB/s gaviota [ -0.7%] + + Westmere (Core i7): + + Benchmark Time(ns) CPU(ns) Iterations + -------------------------------------------- + BM_UFlat/0 78861 78853 177703 1.2GB/s html [ +2.1%] + BM_UFlat/1 739560 739491 18912 905.4MB/s urls [ +3.4%] + BM_UFlat/2 9867 9866 1419014 12.0GB/s jpg [ +3.4%] + BM_UFlat/3 31989 31986 438385 2.7GB/s pdf [ +0.2%] + BM_UFlat/4 319406 319380 43771 1.2GB/s html4 [ +1.9%] + BM_UFlat/5 29639 29636 472862 791.7MB/s cp [ +5.2%] + BM_UFlat/6 13478 13477 1000000 789.0MB/s c [ +2.3%] + BM_UFlat/7 4030 4029 3475364 880.7MB/s lsp [ +8.7%] + BM_UFlat/8 1036585 1036492 10000 947.5MB/s xls [ +6.9%] + BM_UFlat/9 242127 242105 57838 599.1MB/s txt1 [ +3.0%] + BM_UFlat/10 206499 206480 67595 578.2MB/s txt2 [ +3.4%] + BM_UFlat/11 641635 641570 21811 634.4MB/s txt3 [ +2.4%] + BM_UFlat/12 848847 848769 16443 541.4MB/s txt4 [ +3.1%] + BM_UFlat/13 384968 384938 36366 1.2GB/s bin [ +0.3%] + BM_UFlat/14 47106 47101 297770 774.3MB/s sum [ +4.4%] + BM_UFlat/15 5063 5063 2772202 796.2MB/s man [ +7.7%] + BM_UFlat/16 83663 83656 167697 1.3GB/s pb [ +1.8%] + BM_UFlat/17 260224 260198 53823 675.6MB/s gaviota [ -0.5%] + + Barcelona (Opteron): + + Benchmark Time(ns) CPU(ns) Iterations + -------------------------------------------- + BM_UFlat/0 112490 112457 100000 868.4MB/s html [ -0.4%] + BM_UFlat/1 1066719 1066339 10000 627.9MB/s urls [ +1.0%] + BM_UFlat/2 24679 24672 563802 4.8GB/s jpg [ +0.7%] + BM_UFlat/3 50603 50589 277285 1.7GB/s pdf [ +2.6%] + BM_UFlat/4 452982 452849 30900 862.6MB/s html4 [ -0.2%] + BM_UFlat/5 43860 43848 319554 535.1MB/s cp [ +1.2%] + BM_UFlat/6 21419 21413 653573 496.6MB/s c [ +1.0%] + BM_UFlat/7 6646 6645 2105405 534.1MB/s lsp [ +0.3%] + BM_UFlat/8 1828487 1827886 7658 537.3MB/s xls [ +2.6%] + BM_UFlat/9 391824 391714 35708 370.3MB/s txt1 [ +2.2%] + BM_UFlat/10 334913 334816 41885 356.6MB/s txt2 [ +1.7%] + BM_UFlat/11 1042062 1041674 10000 390.7MB/s txt3 [ +1.1%] + BM_UFlat/12 1398902 1398456 10000 328.6MB/s txt4 [ +1.7%] + BM_UFlat/13 545706 545530 25669 897.2MB/s bin [ -0.4%] + BM_UFlat/14 71512 71505 196035 510.0MB/s sum [ +1.4%] + BM_UFlat/15 8422 8421 1665036 478.7MB/s man [ +2.6%] + BM_UFlat/16 112053 112048 100000 1009.3MB/s pb [ -0.4%] + BM_UFlat/17 416723 416713 33612 421.8MB/s gaviota [ -2.0%] + + R=sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@53 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 0c1b9c3904430f5b399bd057d76de4bc36b7a123 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Tue Nov 8 14:46:39 2011 +0000 + + Fix public issue #53: Update the README to the API we actually open-sourced + with. + + R=sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@52 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit b61134bc0a6a904b41522b4e5c9e80874c730cef +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Oct 5 12:27:12 2011 +0000 + + In the format description, use a clearer example to emphasize that varints are + stored in little-endian. Patch from Christian von Roques. + + R=csilvers + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@51 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 21a2e4f55758e759302cd84ad0f3580affcba7d9 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Thu Sep 15 19:34:06 2011 +0000 + + Release Snappy 1.0.4. + + R=sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@50 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit e2e303286813c759c5b1cdb46dad63c494f0a061 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Thu Sep 15 09:50:05 2011 +0000 + + Fix public issue #50: Include generic byteswap macros. + Also include Solaris 10 and FreeBSD versions. + + R=csilvers + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@49 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 593002da3c051f4721312869f816b41485bad3b7 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Aug 10 18:57:27 2011 +0000 + + Partially fix public issue 50: Remove an extra comma from the end of some + enum declarations, as it seems the Sun compiler does not like it. + + Based on patch by Travis Vitek. + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@48 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit f1063a5dc43891eed37f0586bfea57b84dddd756 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Aug 10 18:44:16 2011 +0000 + + Use the right #ifdef test for sys/mman.h. + + Based on patch by Travis Vitek. + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@47 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 41c827a2fa9ce048202d941187f211180feadde4 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Aug 10 01:22:09 2011 +0000 + + Fix public issue #47: Small comment cleanups in the unit test. + + Originally based on a patch by Patrick Pelletier. + + R=sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@46 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 59aeffa6049b5c2a3a467e7602c1f93630b870e7 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Aug 10 01:14:43 2011 +0000 + + Fix public issue #46: Format description said "3-byte offset" + instead of "4-byte offset" for the longest copies. + + Also fix an inconsistency in the heading for section 2.2.3. + Both patches by Patrick Pelletier. + + R=csilvers + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@45 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 57e7cd72559cb022ef32856f2252a4c4585e562e +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Tue Jun 28 11:40:25 2011 +0000 + + Fix public issue #44: Make the definition and declaration of CompressFragment + identical, even regarding cv-qualifiers. + + This is required to work around a bug in the Solaris Studio C++ compiler + (it does not properly disregard cv-qualifiers when doing name mangling). + + R=sanjay + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@44 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 13c4a449a8ea22139c9aa441e8024eebc9dbdf6e +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Sat Jun 4 10:19:05 2011 +0000 + + Correct an inaccuracy in the Snappy format description. + (I stumbled into this when changing the way we decompress literals.) + + R=csilvers + + Revision created by MOE tool push_codebase. + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@43 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit f5406737403119e1483a71d2084d17728663a114 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Fri Jun 3 20:53:06 2011 +0000 + + Speed up decompression by removing a fast-path attempt. + + Whenever we try to enter a copy fast-path, there is a certain cost in checking + that all the preconditions are in place, but it's normally offset by the fact + that we can usually take the cheaper path. However, in a certain path we've + already established that "avail < literal_length", which usually means that + either the available space is small, or the literal is big. Both will disqualify + us from taking the fast path, and thus we take the hit from the precondition + checking without gaining much from having a fast path. Thus, simply don't try + the fast path in this situation -- we're already on a slow path anyway + (one where we need to refill more data from the reader). + + I'm a bit surprised at how much this gained; it could be that this path is + more common than I thought, or that the simpler structure somehow makes the + compiler happier. I haven't looked at the assembler, but it's a win across + the board on both Core 2, Core i7 and Opteron, at least for the cases we + typically care about. The gains seem to be the largest on Core i7, though. + Results from my Core i7 workstation: + + + Benchmark Time(ns) CPU(ns) Iterations + --------------------------------------------------- + BM_UFlat/0 73337 73091 190996 1.3GB/s html [ +1.7%] + BM_UFlat/1 696379 693501 20173 965.5MB/s urls [ +2.7%] + BM_UFlat/2 9765 9734 1472135 12.1GB/s jpg [ +0.7%] + BM_UFlat/3 29720 29621 472973 3.0GB/s pdf [ +1.8%] + BM_UFlat/4 294636 293834 47782 1.3GB/s html4 [ +2.3%] + BM_UFlat/5 28399 28320 494700 828.5MB/s cp [ +3.5%] + BM_UFlat/6 12795 12760 1000000 833.3MB/s c [ +1.2%] + BM_UFlat/7 3984 3973 3526448 893.2MB/s lsp [ +5.7%] + BM_UFlat/8 991996 989322 14141 992.6MB/s xls [ +3.3%] + BM_UFlat/9 228620 227835 61404 636.6MB/s txt1 [ +4.0%] + BM_UFlat/10 197114 196494 72165 607.5MB/s txt2 [ +3.5%] + BM_UFlat/11 605240 603437 23217 674.4MB/s txt3 [ +3.7%] + BM_UFlat/12 804157 802016 17456 573.0MB/s txt4 [ +3.9%] + BM_UFlat/13 347860 346998 40346 1.4GB/s bin [ +1.2%] + BM_UFlat/14 44684 44559 315315 818.4MB/s sum [ +2.3%] + BM_UFlat/15 5120 5106 2739726 789.4MB/s man [ +3.3%] + BM_UFlat/16 76591 76355 183486 1.4GB/s pb [ +2.8%] + BM_UFlat/17 238564 237828 58824 739.1MB/s gaviota [ +1.6%] + BM_UValidate/0 42194 42060 333333 2.3GB/s html [ -0.1%] + BM_UValidate/1 433182 432005 32407 1.5GB/s urls [ -0.1%] + BM_UValidate/2 197 196 71428571 603.3GB/s jpg [ +0.5%] + BM_UValidate/3 14494 14462 972222 6.1GB/s pdf [ +0.5%] + BM_UValidate/4 168444 167836 83832 2.3GB/s html4 [ +0.1%] + + R=jeff + + Revision created by MOE tool push_codebase. + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@42 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 197f3ee9f9397e98c9abf07f9da875fbcb725dba +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Fri Jun 3 20:47:14 2011 +0000 + + Speed up decompression by not needing a lookup table for literal items. + + Looking up into and decoding the values from char_table has long shown up as a + hotspot in the decompressor. While it turns out that it's hard to make a more + efficient decoder for the copy ops, the literals are simple enough that we can + decode them without needing a table lookup. (This means that 1/4 of the table + is now unused, although that in itself doesn't buy us anything.) + + The gains are small, but definitely present; some tests win as much as 10%, + but 1-4% is more typical. These results are from Core i7, in 64-bit mode; + Core 2 and Opteron show similar results. (I've run with more iterations + than unusual to make sure the smaller gains don't drown entirely in noise.) + + Benchmark Time(ns) CPU(ns) Iterations + --------------------------------------------------- + BM_UFlat/0 74665 74428 182055 1.3GB/s html [ +3.1%] + BM_UFlat/1 714106 711997 19663 940.4MB/s urls [ +4.4%] + BM_UFlat/2 9820 9789 1427115 12.1GB/s jpg [ -1.2%] + BM_UFlat/3 30461 30380 465116 2.9GB/s pdf [ +0.8%] + BM_UFlat/4 301445 300568 46512 1.3GB/s html4 [ +2.2%] + BM_UFlat/5 29338 29263 479452 801.8MB/s cp [ +1.6%] + BM_UFlat/6 13004 12970 1000000 819.9MB/s c [ +2.1%] + BM_UFlat/7 4180 4168 3349282 851.4MB/s lsp [ +1.3%] + BM_UFlat/8 1026149 1024000 10000 959.0MB/s xls [+10.7%] + BM_UFlat/9 237441 236830 59072 612.4MB/s txt1 [ +0.3%] + BM_UFlat/10 203966 203298 69307 587.2MB/s txt2 [ +0.8%] + BM_UFlat/11 627230 625000 22400 651.2MB/s txt3 [ +0.7%] + BM_UFlat/12 836188 833979 16787 551.0MB/s txt4 [ +1.3%] + BM_UFlat/13 351904 350750 39886 1.4GB/s bin [ +3.8%] + BM_UFlat/14 45685 45562 308370 800.4MB/s sum [ +5.9%] + BM_UFlat/15 5286 5270 2656546 764.9MB/s man [ +1.5%] + BM_UFlat/16 78774 78544 178117 1.4GB/s pb [ +4.3%] + BM_UFlat/17 242270 241345 58091 728.3MB/s gaviota [ +1.2%] + BM_UValidate/0 42149 42000 333333 2.3GB/s html [ -3.0%] + BM_UValidate/1 432741 431303 32483 1.5GB/s urls [ +7.8%] + BM_UValidate/2 198 197 71428571 600.7GB/s jpg [+16.8%] + BM_UValidate/3 14560 14521 965517 6.1GB/s pdf [ -4.1%] + BM_UValidate/4 169065 168671 83832 2.3GB/s html4 [ -2.9%] + + R=jeff + + Revision created by MOE tool push_codebase. + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@41 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 8efa2639e885ac467e7b11c662975c5844019fb9 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Thu Jun 2 22:57:41 2011 +0000 + + Release Snappy 1.0.3. + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@40 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 2e12124bd87f39296709decc65195fa5bfced538 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Thu Jun 2 18:06:54 2011 +0000 + + Remove an unneeded goto in the decompressor; it turns out that the + state of ip_ after decompression (or attempted decompresion) is + completely irrelevant, so we don't need the trailer. + + Performance is, as expected, mostly flat -- there's a curious ~3-5% + loss in the "lsp" test, but that test case is so short it is hard to say + anything definitive about why (most likely, it's some sort of + unrelated effect). + + R=jeff + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@39 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit c266bbf32103f8ed4a83e2272ed3d8828d5b8b34 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Thu Jun 2 17:59:40 2011 +0000 + + Speed up decompression by caching ip_. + + It is seemingly hard for the compiler to understand that ip_, the current input + pointer into the compressed data stream, can not alias on anything else, and + thus using it directly will incur memory traffic as it cannot be kept in a + register. The code already knew about this and cached it into a local + variable, but since Step() only decoded one tag, it had to move ip_ back into + place between every tag. This seems to have cost us a significant amount of + performance, so changing Step() into a function that decodes as much as it can + before it saves ip_ back and returns. (Note that Step() was already inlined, + so it is not the manual inlining that buys the performance here.) + + The wins are about 3-6% for Core 2, 6-13% on Core i7 and 5-12% on Opteron + (for plain array-to-array decompression, in 64-bit opt mode). + + There is a tiny difference in the behavior here; if an invalid literal is + encountered (ie., the writer refuses the Append() operation), ip_ will now + point to the byte past the tag byte, instead of where the literal was + originally thought to end. However, we don't use ip_ for anything after + DecompressAllTags() has returned, so this should not change external behavior + in any way. + + Microbenchmark results for Core i7, 64-bit (Opteron results are similar): + + Benchmark Time(ns) CPU(ns) Iterations + --------------------------------------------------- + BM_UFlat/0 79134 79110 8835 1.2GB/s html [ +6.2%] + BM_UFlat/1 786126 786096 891 851.8MB/s urls [+10.0%] + BM_UFlat/2 9948 9948 69125 11.9GB/s jpg [ -1.3%] + BM_UFlat/3 31999 31998 21898 2.7GB/s pdf [ +6.5%] + BM_UFlat/4 318909 318829 2204 1.2GB/s html4 [ +6.5%] + BM_UFlat/5 31384 31390 22363 747.5MB/s cp [ +9.2%] + BM_UFlat/6 14037 14034 49858 757.7MB/s c [+10.6%] + BM_UFlat/7 4612 4612 151395 769.5MB/s lsp [ +9.5%] + BM_UFlat/8 1203174 1203007 582 816.3MB/s xls [+19.3%] + BM_UFlat/9 253869 253955 2757 571.1MB/s txt1 [+11.4%] + BM_UFlat/10 219292 219290 3194 544.4MB/s txt2 [+12.1%] + BM_UFlat/11 672135 672131 1000 605.5MB/s txt3 [+11.2%] + BM_UFlat/12 902512 902492 776 509.2MB/s txt4 [+12.5%] + BM_UFlat/13 372110 371998 1881 1.3GB/s bin [ +5.8%] + BM_UFlat/14 50407 50407 10000 723.5MB/s sum [+13.5%] + BM_UFlat/15 5699 5701 100000 707.2MB/s man [+12.4%] + BM_UFlat/16 83448 83424 8383 1.3GB/s pb [ +5.7%] + BM_UFlat/17 256958 256963 2723 684.1MB/s gaviota [ +7.9%] + BM_UValidate/0 42795 42796 16351 2.2GB/s html [+25.8%] + BM_UValidate/1 490672 490622 1427 1.3GB/s urls [+22.7%] + BM_UValidate/2 237 237 2950297 499.0GB/s jpg [+24.9%] + BM_UValidate/3 14610 14611 47901 6.0GB/s pdf [+26.8%] + BM_UValidate/4 171973 171990 4071 2.2GB/s html4 [+25.7%] + + + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@38 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit d0ee043bc50c62c5b5ff3da044f0b5567257407d +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Tue May 17 08:48:25 2011 +0000 + + Fix the numbering of the headlines in the Snappy format description. + + R=csilvers + DELTA=4 (0 added, 0 deleted, 4 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1906 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@37 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 6c7053871fbdb459c9c14287a138d7f82d6d84a1 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Mon May 16 08:59:18 2011 +0000 + + Fix public issue #32: Add compressed format documentation for Snappy. + This text is new, but an earlier version from Zeev Tarantov was used + as reference. + + R=csilvers + DELTA=112 (111 added, 0 deleted, 1 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1867 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@36 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit a1f9f9973d127992f341d442969c86fd9a0847c9 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Mon May 9 21:29:02 2011 +0000 + + Fix public issue #39: Pick out the median runs based on CPU time, + not real time. Also, use nth_element instead of sort, since we + only need one element. + + R=csilvers + DELTA=5 (3 added, 0 deleted, 2 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1799 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@35 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit f7b105683c074cdf233740089e245e43f63e7e55 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Mon May 9 21:28:45 2011 +0000 + + Fix public issue #38: Make the microbenchmark framework handle + properly cases where gettimeofday() can stand return the same + result twice (as sometimes on GNU/Hurd) or go backwards + (as when the user adjusts the clock). We avoid a division-by-zero, + and put a lower bound on the number of iterations -- the same + amount as we use to calibrate. + + We should probably use CLOCK_MONOTONIC for platforms that support + it, to be robust against clock adjustments; we already use Windows' + monotonic timers. However, that's for a later changelist. + + R=csilvers + DELTA=7 (5 added, 0 deleted, 2 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1798 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@34 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit d8d481427a05b88cdb0810c29bf400153595c423 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Tue May 3 23:22:52 2011 +0000 + + Fix public issue #37: Only link snappy_unittest against -lz and other autodetected + libraries, not libsnappy.so (which doesn't need any such dependency). + + R=csilvers + DELTA=20 (14 added, 0 deleted, 6 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1710 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@33 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit bcecf195c0aeb2c98144d3d54b4d8d228774f50d +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Tue May 3 23:22:33 2011 +0000 + + Release Snappy 1.0.2, to get the license change and various other fixes into + a release. + + R=csilvers + DELTA=239 (236 added, 0 deleted, 3 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1709 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@32 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 84d9f642025cda672dda0d94a8008f094500aaa6 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Tue Apr 26 12:34:55 2011 +0000 + + Fix public issue #30: Stop using gettimeofday() altogether on Win32, + as MSVC doesn't include it. Replace with QueryPerformanceCounter(), + which is monotonic and probably reasonably high-resolution. + (Some machines have traditionally had bugs in QPC, but they should + be relatively rare these days, and there's really no much better + alternative that I know of.) + + R=csilvers + DELTA=74 (55 added, 19 deleted, 0 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1556 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@31 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 3d8e71df8d30f980d71d4c784ebfc5ff62d5b0cb +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Tue Apr 26 12:34:37 2011 +0000 + + Fix public issue #31: Don't reset PATH in autogen.sh; instead, do the trickery + we need for our own build system internally. + + R=csilvers + DELTA=16 (13 added, 1 deleted, 2 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1555 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@30 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 73987351de54c88e2fc3f5dcdeceb47708df3585 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Fri Apr 15 22:55:56 2011 +0000 + + When including <windows.h>, define WIN32_LEAN_AND_MEAN first, + so we won't pull in macro definitions of things like min() and max(), + which can conflict with <algorithm>. + + R=csilvers + DELTA=1 (1 added, 0 deleted, 0 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1485 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@29 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit fb7e0eade471a20b009720a84fea0af1552791d5 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Mon Apr 11 09:07:01 2011 +0000 + + Fix public issue #29: Write CPU timing code for Windows, based on GetProcessTimes() + instead of getursage(). + + I thought I'd already committed this patch, so that the 1.0.1 release already + would have a Windows-compatible snappy_unittest, but I'd seemingly deleted it + instead, so this is a reconstruction. + + R=csilvers + DELTA=43 (39 added, 3 deleted, 1 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1295 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@28 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit c67fa0c755a329000da5546fff79089d62ac2f82 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Fri Apr 8 09:51:53 2011 +0000 + + Include C bindings of Snappy, contributed by Martin Gieseking. + + I've made a few changes since Martin's version; mostly style nits, but also + a semantic change -- most functions that return bool in the C++ version now + return an enum, to better match typical C (and zlib) semantics. + + I've kept the copyright notice, since Martin is obviously the author here; + he has signed the contributor license agreement, though, so this should not + hinder Google's use in the future. + + We'll need to update the libtool version number to match the added interface, + but as of http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html + I'm going to wait until public release. + + R=csilvers + DELTA=238 (233 added, 0 deleted, 5 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1294 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@27 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 56be85cb9ae06f2e92180ae2575bdd10c012ab73 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Thu Apr 7 16:36:43 2011 +0000 + + Replace geo.protodata with a newer version. + + The data compresses/decompresses slightly faster than the old data, and has + similar density. + + R=lookingbill + DELTA=1 (0 added, 0 deleted, 1 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1288 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@26 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 3dd93f3ec74df54a37f68bffabb058ac757bbe72 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Mar 30 20:27:53 2011 +0000 + + Fix public issue #27: Add HAVE_CONFIG_H tests around the config.h + inclusion in snappy-stubs-internal.h, which eases compiling outside the + automake/autoconf framework. + + R=csilvers + DELTA=5 (4 added, 1 deleted, 0 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1152 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@25 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit f67bcaa61006da8b325a7ed9909a782590971815 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Mar 30 20:27:39 2011 +0000 + + Fix public issue #26: Take memory allocation and reallocation entirely out of the + Measure() loop. This gives all algorithms a small speed boost, except Snappy which + already didn't do reallocation (so the measurements were slightly biased in its + favor). + + R=csilvers + DELTA=92 (69 added, 9 deleted, 14 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1151 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@24 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit cc333c1c5cc4eabceceb9848ff3cac6c604ecbc6 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Mar 30 20:25:09 2011 +0000 + + Renamed "namespace zippy" to "namespace snappy" to reduce + the differences from the opensource code. Will make it easier + in the future to mix-and-match third-party code that uses + snappy with google code. + + Currently, csearch shows that the only external user of + "namespace zippy" is some bigtable code that accesses + a TEST variable, which is temporarily kept in the zippy + namespace. + + R=sesse + DELTA=123 (18 added, 3 deleted, 102 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1150 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@23 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit f19fb07e6dc79d6857e37df572dba25ff30fc8f3 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Mon Mar 28 22:17:04 2011 +0000 + + Put back the final few lines of what was truncated during the + license header change. + + R=csilvers + DELTA=5 (4 added, 0 deleted, 1 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1094 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@22 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 7e8ca8f8315fc2ecb4eea19db695039ab2ca43a0 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Sat Mar 26 02:34:34 2011 +0000 + + Change on 2011-03-25 19:18:00-07:00 by sesse + + Replace the Apache 2.0 license header by the BSD-type license header; + somehow a lot of the files were missed in the last round. + + R=dannyb,csilvers + DELTA=147 (74 added, 2 deleted, 71 changed) + + Change on 2011-03-25 19:25:07-07:00 by sesse + + Unbreak the build; the relicensing removed a bit too much (only comments + were intended, but I also accidentially removed some of the top lines of + the actual source). + + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1072 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@21 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit b4bbc1041b35d844ec26fbae25f2864995361fd8 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Fri Mar 25 16:14:41 2011 +0000 + + Change Snappy from the Apache 2.0 to a BSD-type license. + + R=dannyb + DELTA=328 (80 added, 184 deleted, 64 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1061 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@20 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit c47640c510eb11cf8913edfa34f667bceb3a4401 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Fri Mar 25 00:39:01 2011 +0000 + + Release Snappy 1.0.1, to soup up all the various small changes + that have been made since release. + + R=csilvers + DELTA=266 (260 added, 0 deleted, 6 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1057 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@19 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit b1dc1f643eaff897a5ce135f525799b99687b118 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Thu Mar 24 19:15:54 2011 +0000 + + Fix a microbenchmark crash on mingw32; seemingly %lld is not universally + supported on Windows, and %I64d is recommended instead. + + R=csilvers + DELTA=6 (5 added, 0 deleted, 1 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1034 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@18 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 98004ca9afc62a3279dfe9d9a359083f61db437f +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Thu Mar 24 19:15:27 2011 +0000 + + Fix public issue #19: Fix unit test when Google Test is installed but the + gflags package isn't (Google Test is not properly initialized). + + Patch by Martin Gieseking. + + R=csilvers + DELTA=2 (1 added, 0 deleted, 1 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1033 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@17 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 444a6c5f72d6f8d8f7213a5bcc08b26606eb9934 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Thu Mar 24 19:13:57 2011 +0000 + + Make the unit test work on systems without mmap(). This is required for, + among others, Windows support. For Windows in specific, we could have used + CreateFileMapping/MapViewOfFile, but this should at least get us a bit closer + to compiling, and is of course also relevant for embedded systems with no MMU. + + (Part 2/2) + + R=csilvers + DELTA=15 (12 added, 3 deleted, 0 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1032 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@16 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 2e182e9bb840737f9cd8817e859dc17a82f2c16b +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Thu Mar 24 19:12:27 2011 +0000 + + Make the unit test work on systems without mmap(). This is required for, + among others, Windows support. For Windows in specific, we could have used + CreateFileMapping/MapViewOfFile, but this should at least get us a bit closer + to compiling, and is of course also relevant for embedded systems with no MMU. + + (Part 1/2) + + R=csilvers + DELTA=9 (8 added, 0 deleted, 1 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1031 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@15 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 48662cbb7f81533977334629790d346220084527 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Mar 23 23:17:36 2011 +0000 + + Fix public issue #12: Don't keep autogenerated auto* files in Subversion; + it causes problems with others sending patches etc.. + + We can't get this 100% hermetic anyhow, due to files like lt~obsolete.m4, + so we can just as well go cleanly in the other direction. + + R=csilvers + DELTA=21038 (0 added, 21036 deleted, 2 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=1012 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@14 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 9e4717a586149c9538b353400312bab5ab5458c4 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Mar 23 17:50:49 2011 +0000 + + Fix public issue tracker bug #3: Call AC_SUBST([LIBTOOL_DEPS]), or the rule + to rebuild libtool in Makefile.am won't work. + + R=csilvers + DELTA=1 (1 added, 0 deleted, 0 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=997 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@13 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 519c822a34a91a0c0eb32d98e9686ee7d9cd6651 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Mar 23 11:16:39 2011 +0000 + + Fix public issue #10: Don't add GTEST_CPPFLAGS to snappy_unittest_CXXFLAGS; + it's not needed (CPPFLAGS are always included when compiling). + + R=csilvers + DELTA=1 (0 added, 1 deleted, 0 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=994 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@12 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit ea6b936378583cba730c33c8a53776edc1782208 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Mar 23 11:16:18 2011 +0000 + + Fix public issue #9: Add -Wall -Werror to automake flags. + (This concerns automake itself, not the C++ compiler.) + + R=csilvers + DELTA=4 (3 added, 0 deleted, 1 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=993 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@11 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit e3ca06af253094b1c3a8eae508cd97accf077535 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Mar 23 11:13:37 2011 +0000 + + Fix a typo in the Snappy README file. + + R=csilvers + DELTA=1 (0 added, 0 deleted, 1 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=992 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@10 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 39d27bea23873abaa663e884261386b17b058f20 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Mar 23 11:13:13 2011 +0000 + + Fix public issue #6: Add a --with-gflags for disabling gflags autodetection + and using a manually given setting (use/don't use) instead. + + R=csilvers + DELTA=16 (13 added, 0 deleted, 3 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=991 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@9 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 60add43d99c1c31aeecd895cb555ad6f6520608e +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Mar 23 11:12:44 2011 +0000 + + Fix public issue #5: Replace the EXTRA_LIBSNAPPY_LDFLAGS setup with something + slightly more standard, that also doesn't leak libtool command-line into + configure.ac. + + R=csilvers + DELTA=7 (0 added, 4 deleted, 3 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=990 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@8 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit a8dd1700879ad646106742aa0e9c3a48dc07b01d +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Mar 23 11:12:22 2011 +0000 + + Fix public issue #4: Properly quote all macro arguments in configure.ac. + + R=csilvers + DELTA=16 (0 added, 0 deleted, 16 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=989 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@7 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 79752dd7033658e28dc894de55012bdf2c9afca3 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Mar 23 11:11:54 2011 +0000 + + Fix public issue #7: Don't use internal variables named ac_*, as those belong + to autoconf's namespace. + + R=csilvers + DELTA=6 (0 added, 0 deleted, 6 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=988 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@6 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 46e39fb20c297129494b969ac4ea64fcd04b4fa0 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Mar 23 11:11:09 2011 +0000 + + Add missing licensing headers to a few files. (Part 2/2.) + + R=csilvers + DELTA=12 (12 added, 0 deleted, 0 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=987 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@5 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 3e764216fc8edaafca480443b90e55c14eaae2c2 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Mar 23 11:10:39 2011 +0000 + + Add mising licensing headers to a few files. (Part 1/2.) + + R=csilvers + DELTA=24 (24 added, 0 deleted, 0 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=986 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@4 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 9a59f183c8ffec62dcdabd3499d0d515e44e4ef0 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Wed Mar 23 11:10:04 2011 +0000 + + Use the correct license file for the Apache 2.0 license; + spotted by Florian Weimer. + + R=csilvers + DELTA=202 (174 added, 0 deleted, 28 changed) + + + Revision created by MOE tool push_codebase. + MOE_MIGRATION=985 + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@3 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 28a64402392c791905d6e1384ea1b48a5cb0b281 +Author: snappy.mirrorbot@gmail.com <snappy.mirrorbot@gmail.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Fri Mar 18 17:14:15 2011 +0000 + + Revision created by MOE tool push_codebase. + MOE_MIGRATION= + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@2 03e5f5b5-db94-4691-08a0-1a8bf15f6143 + +commit 7c3c6077b72b4ae2237267a20f640b55e9a90569 +Author: sesse@google.com <sesse@google.com@03e5f5b5-db94-4691-08a0-1a8bf15f6143> +Date: Fri Mar 18 17:13:52 2011 +0000 + + Create trunk directory. + + + git-svn-id: https://snappy.googlecode.com/svn/trunk@1 03e5f5b5-db94-4691-08a0-1a8bf15f6143 diff --git a/other-licenses/snappy/src/NEWS b/other-licenses/snappy/src/NEWS new file mode 100644 index 0000000000..4eb7a1d1a9 --- /dev/null +++ b/other-licenses/snappy/src/NEWS @@ -0,0 +1,140 @@ +Snappy v1.1.3, July 6th 2015: + +This is the first release to be done from GitHub, which means that +some minor things like the ChangeLog format has changed (git log +format instead of svn log). + + * Add support for Uncompress() from a Source to a Sink. + + * Various minor changes to improve MSVC support; in particular, + the unit tests now compile and run under MSVC. + + +Snappy v1.1.2, February 28th 2014: + +This is a maintenance release with no changes to the actual library +source code. + + * Stop distributing benchmark data files that have unclear + or unsuitable licensing. + + * Add support for padding chunks in the framing format. + + +Snappy v1.1.1, October 15th 2013: + + * Add support for uncompressing to iovecs (scatter I/O). + The bulk of this patch was contributed by Mohit Aron. + + * Speed up decompression by ~2%; much more so (~13-20%) on + a few benchmarks on given compilers and CPUs. + + * Fix a few issues with MSVC compilation. + + * Support truncated test data in the benchmark. + + +Snappy v1.1.0, January 18th 2013: + + * Snappy now uses 64 kB block size instead of 32 kB. On average, + this means it compresses about 3% denser (more so for some + inputs), at the same or better speeds. + + * libsnappy no longer depends on iostream. + + * Some small performance improvements in compression on x86 + (0.5–1%). + + * Various portability fixes for ARM-based platforms, for MSVC, + and for GNU/Hurd. + + +Snappy v1.0.5, February 24th 2012: + + * More speed improvements. Exactly how big will depend on + the architecture: + + - 3–10% faster decompression for the base case (x86-64). + + - ARMv7 and higher can now use unaligned accesses, + and will see about 30% faster decompression and + 20–40% faster compression. + + - 32-bit platforms (ARM and 32-bit x86) will see 2–5% + faster compression. + + These are all cumulative (e.g., ARM gets all three speedups). + + * Fixed an issue where the unit test would crash on system + with less than 256 MB address space available, + e.g. some embedded platforms. + + * Added a framing format description, for use over e.g. HTTP, + or for a command-line compressor. We do not have any + implementations of this at the current point, but there seems + to be enough of a general interest in the topic. + Also make the format description slightly clearer. + + * Remove some compile-time warnings in -Wall + (mostly signed/unsigned comparisons), for easier embedding + into projects that use -Wall -Werror. + + +Snappy v1.0.4, September 15th 2011: + + * Speeded up the decompressor somewhat; typically about 2–8% + for Core i7, in 64-bit mode (comparable for Opteron). + Somewhat more for some tests, almost no gain for others. + + * Make Snappy compile on certain platforms it didn't before + (Solaris with SunPro C++, HP-UX, AIX). + + * Correct some minor errors in the format description. + + +Snappy v1.0.3, June 2nd 2011: + + * Speeded up the decompressor somewhat; about 3-6% for Core 2, + 6-13% for Core i7, and 5-12% for Opteron (all in 64-bit mode). + + * Added compressed format documentation. This text is new, + but an earlier version from Zeev Tarantov was used as reference. + + * Only link snappy_unittest against -lz and other autodetected + libraries, not libsnappy.so (which doesn't need any such dependency). + + * Fixed some display issues in the microbenchmarks, one of which would + frequently make the test crash on GNU/Hurd. + + +Snappy v1.0.2, April 29th 2011: + + * Relicense to a BSD-type license. + + * Added C bindings, contributed by Martin Gieseking. + + * More Win32 fixes, in particular for MSVC. + + * Replace geo.protodata with a newer version. + + * Fix timing inaccuracies in the unit test when comparing Snappy + to other algorithms. + + +Snappy v1.0.1, March 25th 2011: + +This is a maintenance release, mostly containing minor fixes. +There is no new functionality. The most important fixes include: + + * The COPYING file and all licensing headers now correctly state that + Snappy is licensed under the Apache 2.0 license. + + * snappy_unittest should now compile natively under Windows, + as well as on embedded systems with no mmap(). + + * Various autotools nits have been fixed. + + +Snappy v1.0, March 17th 2011: + + * Initial version. diff --git a/other-licenses/snappy/src/README b/other-licenses/snappy/src/README new file mode 100644 index 0000000000..c60dab9a1c --- /dev/null +++ b/other-licenses/snappy/src/README @@ -0,0 +1,139 @@ +Snappy, a fast compressor/decompressor. + + +Introduction +============ + +Snappy is a compression/decompression library. It does not aim for maximum +compression, or compatibility with any other compression library; instead, +it aims for very high speeds and reasonable compression. For instance, +compared to the fastest mode of zlib, Snappy is an order of magnitude faster +for most inputs, but the resulting compressed files are anywhere from 20% to +100% bigger. (For more information, see "Performance", below.) + +Snappy has the following properties: + + * Fast: Compression speeds at 250 MB/sec and beyond, with no assembler code. + See "Performance" below. + * Stable: Over the last few years, Snappy has compressed and decompressed + petabytes of data in Google's production environment. The Snappy bitstream + format is stable and will not change between versions. + * Robust: The Snappy decompressor is designed not to crash in the face of + corrupted or malicious input. + * Free and open source software: Snappy is licensed under a BSD-type license. + For more information, see the included COPYING file. + +Snappy has previously been called "Zippy" in some Google presentations +and the like. + + +Performance +=========== + +Snappy is intended to be fast. On a single core of a Core i7 processor +in 64-bit mode, it compresses at about 250 MB/sec or more and decompresses at +about 500 MB/sec or more. (These numbers are for the slowest inputs in our +benchmark suite; others are much faster.) In our tests, Snappy usually +is faster than algorithms in the same class (e.g. LZO, LZF, FastLZ, QuickLZ, +etc.) while achieving comparable compression ratios. + +Typical compression ratios (based on the benchmark suite) are about 1.5-1.7x +for plain text, about 2-4x for HTML, and of course 1.0x for JPEGs, PNGs and +other already-compressed data. Similar numbers for zlib in its fastest mode +are 2.6-2.8x, 3-7x and 1.0x, respectively. More sophisticated algorithms are +capable of achieving yet higher compression rates, although usually at the +expense of speed. Of course, compression ratio will vary significantly with +the input. + +Although Snappy should be fairly portable, it is primarily optimized +for 64-bit x86-compatible processors, and may run slower in other environments. +In particular: + + - Snappy uses 64-bit operations in several places to process more data at + once than would otherwise be possible. + - Snappy assumes unaligned 32- and 64-bit loads and stores are cheap. + On some platforms, these must be emulated with single-byte loads + and stores, which is much slower. + - Snappy assumes little-endian throughout, and needs to byte-swap data in + several places if running on a big-endian platform. + +Experience has shown that even heavily tuned code can be improved. +Performance optimizations, whether for 64-bit x86 or other platforms, +are of course most welcome; see "Contact", below. + + +Usage +===== + +Note that Snappy, both the implementation and the main interface, +is written in C++. However, several third-party bindings to other languages +are available; see the home page at http://google.github.io/snappy/ +for more information. Also, if you want to use Snappy from C code, you can +use the included C bindings in snappy-c.h. + +To use Snappy from your own C++ program, include the file "snappy.h" from +your calling file, and link against the compiled library. + +There are many ways to call Snappy, but the simplest possible is + + snappy::Compress(input.data(), input.size(), &output); + +and similarly + + snappy::Uncompress(input.data(), input.size(), &output); + +where "input" and "output" are both instances of std::string. + +There are other interfaces that are more flexible in various ways, including +support for custom (non-array) input sources. See the header file for more +information. + + +Tests and benchmarks +==================== + +When you compile Snappy, snappy_unittest is compiled in addition to the +library itself. You do not need it to use the compressor from your own library, +but it contains several useful components for Snappy development. + +First of all, it contains unit tests, verifying correctness on your machine in +various scenarios. If you want to change or optimize Snappy, please run the +tests to verify you have not broken anything. Note that if you have the +Google Test library installed, unit test behavior (especially failures) will be +significantly more user-friendly. You can find Google Test at + + http://github.com/google/googletest + +You probably also want the gflags library for handling of command-line flags; +you can find it at + + http://gflags.github.io/gflags/ + +In addition to the unit tests, snappy contains microbenchmarks used to +tune compression and decompression performance. These are automatically run +before the unit tests, but you can disable them using the flag +--run_microbenchmarks=false if you have gflags installed (otherwise you will +need to edit the source). + +Finally, snappy can benchmark Snappy against a few other compression libraries +(zlib, LZO, LZF, FastLZ and QuickLZ), if they were detected at configure time. +To benchmark using a given file, give the compression algorithm you want to test +Snappy against (e.g. --zlib) and then a list of one or more file names on the +command line. The testdata/ directory contains the files used by the +microbenchmark, which should provide a reasonably balanced starting point for +benchmarking. (Note that baddata[1-3].snappy are not intended as benchmarks; they +are used to verify correctness in the presence of corrupted data in the unit +test.) + + +Contact +======= + +Snappy is distributed through GitHub. For the latest version, a bug tracker, +and other information, see + + http://google.github.io/snappy/ + +or the repository at + + https://github.com/google/snappy diff --git a/other-licenses/snappy/src/format_description.txt b/other-licenses/snappy/src/format_description.txt new file mode 100644 index 0000000000..20db66c1f2 --- /dev/null +++ b/other-licenses/snappy/src/format_description.txt @@ -0,0 +1,110 @@ +Snappy compressed format description +Last revised: 2011-10-05 + + +This is not a formal specification, but should suffice to explain most +relevant parts of how the Snappy format works. It is originally based on +text by Zeev Tarantov. + +Snappy is a LZ77-type compressor with a fixed, byte-oriented encoding. +There is no entropy encoder backend nor framing layer -- the latter is +assumed to be handled by other parts of the system. + +This document only describes the format, not how the Snappy compressor nor +decompressor actually works. The correctness of the decompressor should not +depend on implementation details of the compressor, and vice versa. + + +1. Preamble + +The stream starts with the uncompressed length (up to a maximum of 2^32 - 1), +stored as a little-endian varint. Varints consist of a series of bytes, +where the lower 7 bits are data and the upper bit is set iff there are +more bytes to be read. In other words, an uncompressed length of 64 would +be stored as 0x40, and an uncompressed length of 2097150 (0x1FFFFE) +would be stored as 0xFE 0xFF 0x7F. + + +2. The compressed stream itself + +There are two types of elements in a Snappy stream: Literals and +copies (backreferences). There is no restriction on the order of elements, +except that the stream naturally cannot start with a copy. (Having +two literals in a row is never optimal from a compression point of +view, but nevertheless fully permitted.) Each element starts with a tag byte, +and the lower two bits of this tag byte signal what type of element will +follow: + + 00: Literal + 01: Copy with 1-byte offset + 10: Copy with 2-byte offset + 11: Copy with 4-byte offset + +The interpretation of the upper six bits are element-dependent. + + +2.1. Literals (00) + +Literals are uncompressed data stored directly in the byte stream. +The literal length is stored differently depending on the length +of the literal: + + - For literals up to and including 60 bytes in length, the upper + six bits of the tag byte contain (len-1). The literal follows + immediately thereafter in the bytestream. + - For longer literals, the (len-1) value is stored after the tag byte, + little-endian. The upper six bits of the tag byte describe how + many bytes are used for the length; 60, 61, 62 or 63 for + 1-4 bytes, respectively. The literal itself follows after the + length. + + +2.2. Copies + +Copies are references back into previous decompressed data, telling +the decompressor to reuse data it has previously decoded. +They encode two values: The _offset_, saying how many bytes back +from the current position to read, and the _length_, how many bytes +to copy. Offsets of zero can be encoded, but are not legal; +similarly, it is possible to encode backreferences that would +go past the end of the block (offset > current decompressed position), +which is also nonsensical and thus not allowed. + +As in most LZ77-based compressors, the length can be larger than the offset, +yielding a form of run-length encoding (RLE). For instance, +"xababab" could be encoded as + + <literal: "xab"> <copy: offset=2 length=4> + +Note that since the current Snappy compressor works in 32 kB +blocks and does not do matching across blocks, it will never produce +a bitstream with offsets larger than about 32768. However, the +decompressor should not rely on this, as it may change in the future. + +There are several different kinds of copy elements, depending on +the amount of bytes to be copied (length), and how far back the +data to be copied is (offset). + + +2.2.1. Copy with 1-byte offset (01) + +These elements can encode lengths between [4..11] bytes and offsets +between [0..2047] bytes. (len-4) occupies three bits and is stored +in bits [2..4] of the tag byte. The offset occupies 11 bits, of which the +upper three are stored in the upper three bits ([5..7]) of the tag byte, +and the lower eight are stored in a byte following the tag byte. + + +2.2.2. Copy with 2-byte offset (10) + +These elements can encode lengths between [1..64] and offsets from +[0..65535]. (len-1) occupies six bits and is stored in the upper +six bits ([2..7]) of the tag byte. The offset is stored as a +little-endian 16-bit integer in the two bytes following the tag byte. + + +2.2.3. Copy with 4-byte offset (11) + +These are like the copies with 2-byte offsets (see previous subsection), +except that the offset is stored as a 32-bit integer instead of a +16-bit integer (and thus will occupy four bytes). diff --git a/other-licenses/snappy/src/framing_format.txt b/other-licenses/snappy/src/framing_format.txt new file mode 100644 index 0000000000..9764e83de6 --- /dev/null +++ b/other-licenses/snappy/src/framing_format.txt @@ -0,0 +1,135 @@ +Snappy framing format description +Last revised: 2013-10-25 + +This format decribes a framing format for Snappy, allowing compressing to +files or streams that can then more easily be decompressed without having +to hold the entire stream in memory. It also provides data checksums to +help verify integrity. It does not provide metadata checksums, so it does +not protect against e.g. all forms of truncations. + +Implementation of the framing format is optional for Snappy compressors and +decompressor; it is not part of the Snappy core specification. + + +1. General structure + +The file consists solely of chunks, lying back-to-back with no padding +in between. Each chunk consists first a single byte of chunk identifier, +then a three-byte little-endian length of the chunk in bytes (from 0 to +16777215, inclusive), and then the data if any. The four bytes of chunk +header is not counted in the data length. + +The different chunk types are listed below. The first chunk must always +be the stream identifier chunk (see section 4.1, below). The stream +ends when the file ends -- there is no explicit end-of-file marker. + + +2. File type identification + +The following identifiers for this format are recommended where appropriate. +However, note that none have been registered officially, so this is only to +be taken as a guideline. We use "Snappy framed" to distinguish between this +format and raw Snappy data. + + File extension: .sz + MIME type: application/x-snappy-framed + HTTP Content-Encoding: x-snappy-framed + + +3. Checksum format + +Some chunks have data protected by a checksum (the ones that do will say so +explicitly). The checksums are always masked CRC-32Cs. + +A description of CRC-32C can be found in RFC 3720, section 12.1, with +examples in section B.4. + +Checksums are not stored directly, but masked, as checksumming data and +then its own checksum can be problematic. The masking is the same as used +in Apache Hadoop: Rotate the checksum by 15 bits, then add the constant +0xa282ead8 (using wraparound as normal for unsigned integers). This is +equivalent to the following C code: + + uint32_t mask_checksum(uint32_t x) { + return ((x >> 15) | (x << 17)) + 0xa282ead8; + } + +Note that the masking is reversible. + +The checksum is always stored as a four bytes long integer, in little-endian. + + +4. Chunk types + +The currently supported chunk types are described below. The list may +be extended in the future. + + +4.1. Stream identifier (chunk type 0xff) + +The stream identifier is always the first element in the stream. +It is exactly six bytes long and contains "sNaPpY" in ASCII. This means that +a valid Snappy framed stream always starts with the bytes + + 0xff 0x06 0x00 0x00 0x73 0x4e 0x61 0x50 0x70 0x59 + +The stream identifier chunk can come multiple times in the stream besides +the first; if such a chunk shows up, it should simply be ignored, assuming +it has the right length and contents. This allows for easy concatenation of +compressed files without the need for re-framing. + + +4.2. Compressed data (chunk type 0x00) + +Compressed data chunks contain a normal Snappy compressed bitstream; +see the compressed format specification. The compressed data is preceded by +the CRC-32C (see section 3) of the _uncompressed_ data. + +Note that the data portion of the chunk, i.e., the compressed contents, +can be at most 16777211 bytes (2^24 - 1, minus the checksum). +However, we place an additional restriction that the uncompressed data +in a chunk must be no longer than 65536 bytes. This allows consumers to +easily use small fixed-size buffers. + + +4.3. Uncompressed data (chunk type 0x01) + +Uncompressed data chunks allow a compressor to send uncompressed, +raw data; this is useful if, for instance, uncompressible or +near-incompressible data is detected, and faster decompression is desired. + +As in the compressed chunks, the data is preceded by its own masked +CRC-32C (see section 3). + +An uncompressed data chunk, like compressed data chunks, should contain +no more than 65536 data bytes, so the maximum legal chunk length with the +checksum is 65540. + + +4.4. Padding (chunk type 0xfe) + +Padding chunks allow a compressor to increase the size of the data stream +so that it complies with external demands, e.g. that the total number of +bytes is a multiple of some value. + +All bytes of the padding chunk, except the chunk byte itself and the length, +should be zero, but decompressors must not try to interpret or verify the +padding data in any way. + + +4.5. Reserved unskippable chunks (chunk types 0x02-0x7f) + +These are reserved for future expansion. A decoder that sees such a chunk +should immediately return an error, as it must assume it cannot decode the +stream correctly. + +Future versions of this specification may define meanings for these chunks. + + +4.6. Reserved skippable chunks (chunk types 0x80-0xfd) + +These are also reserved for future expansion, but unlike the chunks +described in 4.5, a decoder seeing these must skip them and continue +decoding. + +Future versions of this specification may define meanings for these chunks. diff --git a/other-licenses/snappy/src/snappy-c.cc b/other-licenses/snappy/src/snappy-c.cc new file mode 100644 index 0000000000..473a0b0978 --- /dev/null +++ b/other-licenses/snappy/src/snappy-c.cc @@ -0,0 +1,90 @@ +// Copyright 2011 Martin Gieseking <martin.gieseking@uos.de>. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +#include "snappy.h" +#include "snappy-c.h" + +extern "C" { + +snappy_status snappy_compress(const char* input, + size_t input_length, + char* compressed, + size_t *compressed_length) { + if (*compressed_length < snappy_max_compressed_length(input_length)) { + return SNAPPY_BUFFER_TOO_SMALL; + } + snappy::RawCompress(input, input_length, compressed, compressed_length); + return SNAPPY_OK; +} + +snappy_status snappy_uncompress(const char* compressed, + size_t compressed_length, + char* uncompressed, + size_t* uncompressed_length) { + size_t real_uncompressed_length; + if (!snappy::GetUncompressedLength(compressed, + compressed_length, + &real_uncompressed_length)) { + return SNAPPY_INVALID_INPUT; + } + if (*uncompressed_length < real_uncompressed_length) { + return SNAPPY_BUFFER_TOO_SMALL; + } + if (!snappy::RawUncompress(compressed, compressed_length, uncompressed)) { + return SNAPPY_INVALID_INPUT; + } + *uncompressed_length = real_uncompressed_length; + return SNAPPY_OK; +} + +size_t snappy_max_compressed_length(size_t source_length) { + return snappy::MaxCompressedLength(source_length); +} + +snappy_status snappy_uncompressed_length(const char *compressed, + size_t compressed_length, + size_t *result) { + if (snappy::GetUncompressedLength(compressed, + compressed_length, + result)) { + return SNAPPY_OK; + } else { + return SNAPPY_INVALID_INPUT; + } +} + +snappy_status snappy_validate_compressed_buffer(const char *compressed, + size_t compressed_length) { + if (snappy::IsValidCompressedBuffer(compressed, compressed_length)) { + return SNAPPY_OK; + } else { + return SNAPPY_INVALID_INPUT; + } +} + +} // extern "C" diff --git a/other-licenses/snappy/src/snappy-c.h b/other-licenses/snappy/src/snappy-c.h new file mode 100644 index 0000000000..32aa0c6b8b --- /dev/null +++ b/other-licenses/snappy/src/snappy-c.h @@ -0,0 +1,138 @@ +/* + * Copyright 2011 Martin Gieseking <martin.gieseking@uos.de>. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following disclaimer + * in the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Google Inc. nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Plain C interface (a wrapper around the C++ implementation). + */ + +#ifndef THIRD_PARTY_SNAPPY_OPENSOURCE_SNAPPY_C_H_ +#define THIRD_PARTY_SNAPPY_OPENSOURCE_SNAPPY_C_H_ + +#ifdef __cplusplus +extern "C" { +#endif + +#include <stddef.h> + +/* + * Return values; see the documentation for each function to know + * what each can return. + */ +typedef enum { + SNAPPY_OK = 0, + SNAPPY_INVALID_INPUT = 1, + SNAPPY_BUFFER_TOO_SMALL = 2 +} snappy_status; + +/* + * Takes the data stored in "input[0..input_length-1]" and stores + * it in the array pointed to by "compressed". + * + * <compressed_length> signals the space available in "compressed". + * If it is not at least equal to "snappy_max_compressed_length(input_length)", + * SNAPPY_BUFFER_TOO_SMALL is returned. After successful compression, + * <compressed_length> contains the true length of the compressed output, + * and SNAPPY_OK is returned. + * + * Example: + * size_t output_length = snappy_max_compressed_length(input_length); + * char* output = (char*)malloc(output_length); + * if (snappy_compress(input, input_length, output, &output_length) + * == SNAPPY_OK) { + * ... Process(output, output_length) ... + * } + * free(output); + */ +snappy_status snappy_compress(const char* input, + size_t input_length, + char* compressed, + size_t* compressed_length); + +/* + * Given data in "compressed[0..compressed_length-1]" generated by + * calling the snappy_compress routine, this routine stores + * the uncompressed data to + * uncompressed[0..uncompressed_length-1]. + * Returns failure (a value not equal to SNAPPY_OK) if the message + * is corrupted and could not be decrypted. + * + * <uncompressed_length> signals the space available in "uncompressed". + * If it is not at least equal to the value returned by + * snappy_uncompressed_length for this stream, SNAPPY_BUFFER_TOO_SMALL + * is returned. After successful decompression, <uncompressed_length> + * contains the true length of the decompressed output. + * + * Example: + * size_t output_length; + * if (snappy_uncompressed_length(input, input_length, &output_length) + * != SNAPPY_OK) { + * ... fail ... + * } + * char* output = (char*)malloc(output_length); + * if (snappy_uncompress(input, input_length, output, &output_length) + * == SNAPPY_OK) { + * ... Process(output, output_length) ... + * } + * free(output); + */ +snappy_status snappy_uncompress(const char* compressed, + size_t compressed_length, + char* uncompressed, + size_t* uncompressed_length); + +/* + * Returns the maximal size of the compressed representation of + * input data that is "source_length" bytes in length. + */ +size_t snappy_max_compressed_length(size_t source_length); + +/* + * REQUIRES: "compressed[]" was produced by snappy_compress() + * Returns SNAPPY_OK and stores the length of the uncompressed data in + * *result normally. Returns SNAPPY_INVALID_INPUT on parsing error. + * This operation takes O(1) time. + */ +snappy_status snappy_uncompressed_length(const char* compressed, + size_t compressed_length, + size_t* result); + +/* + * Check if the contents of "compressed[]" can be uncompressed successfully. + * Does not return the uncompressed data; if so, returns SNAPPY_OK, + * or if not, returns SNAPPY_INVALID_INPUT. + * Takes time proportional to compressed_length, but is usually at least a + * factor of four faster than actual decompression. + */ +snappy_status snappy_validate_compressed_buffer(const char* compressed, + size_t compressed_length); + +#ifdef __cplusplus +} // extern "C" +#endif + +#endif /* THIRD_PARTY_SNAPPY_OPENSOURCE_SNAPPY_C_H_ */ diff --git a/other-licenses/snappy/src/snappy-internal.h b/other-licenses/snappy/src/snappy-internal.h new file mode 100644 index 0000000000..c4d1f6dac6 --- /dev/null +++ b/other-licenses/snappy/src/snappy-internal.h @@ -0,0 +1,212 @@ +// Copyright 2008 Google Inc. All Rights Reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +// +// Internals shared between the Snappy implementation and its unittest. + +#ifndef THIRD_PARTY_SNAPPY_SNAPPY_INTERNAL_H_ +#define THIRD_PARTY_SNAPPY_SNAPPY_INTERNAL_H_ + +#include "snappy-stubs-internal.h" + +namespace snappy { +namespace internal { + +class WorkingMemory { + public: + WorkingMemory() : large_table_(NULL) { } + ~WorkingMemory() { delete[] large_table_; } + + // Allocates and clears a hash table using memory in "*this", + // stores the number of buckets in "*table_size" and returns a pointer to + // the base of the hash table. + uint16* GetHashTable(size_t input_size, int* table_size); + + private: + uint16 small_table_[1<<10]; // 2KB + uint16* large_table_; // Allocated only when needed + + DISALLOW_COPY_AND_ASSIGN(WorkingMemory); +}; + +// Flat array compression that does not emit the "uncompressed length" +// prefix. Compresses "input" string to the "*op" buffer. +// +// REQUIRES: "input_length <= kBlockSize" +// REQUIRES: "op" points to an array of memory that is at least +// "MaxCompressedLength(input_length)" in size. +// REQUIRES: All elements in "table[0..table_size-1]" are initialized to zero. +// REQUIRES: "table_size" is a power of two +// +// Returns an "end" pointer into "op" buffer. +// "end - op" is the compressed size of "input". +char* CompressFragment(const char* input, + size_t input_length, + char* op, + uint16* table, + const int table_size); + +// Return the largest n such that +// +// s1[0,n-1] == s2[0,n-1] +// and n <= (s2_limit - s2). +// +// Does not read *s2_limit or beyond. +// Does not read *(s1 + (s2_limit - s2)) or beyond. +// Requires that s2_limit >= s2. +// +// Separate implementation for x86_64, for speed. Uses the fact that +// x86_64 is little endian. +#if defined(ARCH_K8) +static inline int FindMatchLength(const char* s1, + const char* s2, + const char* s2_limit) { + assert(s2_limit >= s2); + int matched = 0; + + // Find out how long the match is. We loop over the data 64 bits at a + // time until we find a 64-bit block that doesn't match; then we find + // the first non-matching bit and use that to calculate the total + // length of the match. + while (PREDICT_TRUE(s2 <= s2_limit - 8)) { + if (UNALIGNED_LOAD64(s2) == UNALIGNED_LOAD64(s1 + matched)) { + s2 += 8; + matched += 8; + } else { + // On current (mid-2008) Opteron models there is a 3% more + // efficient code sequence to find the first non-matching byte. + // However, what follows is ~10% better on Intel Core 2 and newer, + // and we expect AMD's bsf instruction to improve. + uint64 x = UNALIGNED_LOAD64(s2) ^ UNALIGNED_LOAD64(s1 + matched); + int matching_bits = Bits::FindLSBSetNonZero64(x); + matched += matching_bits >> 3; + return matched; + } + } + while (PREDICT_TRUE(s2 < s2_limit)) { + if (s1[matched] == *s2) { + ++s2; + ++matched; + } else { + return matched; + } + } + return matched; +} +#else +static inline int FindMatchLength(const char* s1, + const char* s2, + const char* s2_limit) { + // Implementation based on the x86-64 version, above. + assert(s2_limit >= s2); + int matched = 0; + + while (s2 <= s2_limit - 4 && + UNALIGNED_LOAD32(s2) == UNALIGNED_LOAD32(s1 + matched)) { + s2 += 4; + matched += 4; + } + if (LittleEndian::IsLittleEndian() && s2 <= s2_limit - 4) { + uint32 x = UNALIGNED_LOAD32(s2) ^ UNALIGNED_LOAD32(s1 + matched); + int matching_bits = Bits::FindLSBSetNonZero(x); + matched += matching_bits >> 3; + } else { + while ((s2 < s2_limit) && (s1[matched] == *s2)) { + ++s2; + ++matched; + } + } + return matched; +} +#endif + +// Lookup tables for decompression code. Give --snappy_dump_decompression_table +// to the unit test to recompute char_table. + +enum { + LITERAL = 0, + COPY_1_BYTE_OFFSET = 1, // 3 bit length + 3 bits of offset in opcode + COPY_2_BYTE_OFFSET = 2, + COPY_4_BYTE_OFFSET = 3 +}; +static const int kMaximumTagLength = 5; // COPY_4_BYTE_OFFSET plus the actual offset. + +// Mapping from i in range [0,4] to a mask to extract the bottom 8*i bits +static const uint32 wordmask[] = { + 0u, 0xffu, 0xffffu, 0xffffffu, 0xffffffffu +}; + +// Data stored per entry in lookup table: +// Range Bits-used Description +// ------------------------------------ +// 1..64 0..7 Literal/copy length encoded in opcode byte +// 0..7 8..10 Copy offset encoded in opcode byte / 256 +// 0..4 11..13 Extra bytes after opcode +// +// We use eight bits for the length even though 7 would have sufficed +// because of efficiency reasons: +// (1) Extracting a byte is faster than a bit-field +// (2) It properly aligns copy offset so we do not need a <<8 +static const uint16 char_table[256] = { + 0x0001, 0x0804, 0x1001, 0x2001, 0x0002, 0x0805, 0x1002, 0x2002, + 0x0003, 0x0806, 0x1003, 0x2003, 0x0004, 0x0807, 0x1004, 0x2004, + 0x0005, 0x0808, 0x1005, 0x2005, 0x0006, 0x0809, 0x1006, 0x2006, + 0x0007, 0x080a, 0x1007, 0x2007, 0x0008, 0x080b, 0x1008, 0x2008, + 0x0009, 0x0904, 0x1009, 0x2009, 0x000a, 0x0905, 0x100a, 0x200a, + 0x000b, 0x0906, 0x100b, 0x200b, 0x000c, 0x0907, 0x100c, 0x200c, + 0x000d, 0x0908, 0x100d, 0x200d, 0x000e, 0x0909, 0x100e, 0x200e, + 0x000f, 0x090a, 0x100f, 0x200f, 0x0010, 0x090b, 0x1010, 0x2010, + 0x0011, 0x0a04, 0x1011, 0x2011, 0x0012, 0x0a05, 0x1012, 0x2012, + 0x0013, 0x0a06, 0x1013, 0x2013, 0x0014, 0x0a07, 0x1014, 0x2014, + 0x0015, 0x0a08, 0x1015, 0x2015, 0x0016, 0x0a09, 0x1016, 0x2016, + 0x0017, 0x0a0a, 0x1017, 0x2017, 0x0018, 0x0a0b, 0x1018, 0x2018, + 0x0019, 0x0b04, 0x1019, 0x2019, 0x001a, 0x0b05, 0x101a, 0x201a, + 0x001b, 0x0b06, 0x101b, 0x201b, 0x001c, 0x0b07, 0x101c, 0x201c, + 0x001d, 0x0b08, 0x101d, 0x201d, 0x001e, 0x0b09, 0x101e, 0x201e, + 0x001f, 0x0b0a, 0x101f, 0x201f, 0x0020, 0x0b0b, 0x1020, 0x2020, + 0x0021, 0x0c04, 0x1021, 0x2021, 0x0022, 0x0c05, 0x1022, 0x2022, + 0x0023, 0x0c06, 0x1023, 0x2023, 0x0024, 0x0c07, 0x1024, 0x2024, + 0x0025, 0x0c08, 0x1025, 0x2025, 0x0026, 0x0c09, 0x1026, 0x2026, + 0x0027, 0x0c0a, 0x1027, 0x2027, 0x0028, 0x0c0b, 0x1028, 0x2028, + 0x0029, 0x0d04, 0x1029, 0x2029, 0x002a, 0x0d05, 0x102a, 0x202a, + 0x002b, 0x0d06, 0x102b, 0x202b, 0x002c, 0x0d07, 0x102c, 0x202c, + 0x002d, 0x0d08, 0x102d, 0x202d, 0x002e, 0x0d09, 0x102e, 0x202e, + 0x002f, 0x0d0a, 0x102f, 0x202f, 0x0030, 0x0d0b, 0x1030, 0x2030, + 0x0031, 0x0e04, 0x1031, 0x2031, 0x0032, 0x0e05, 0x1032, 0x2032, + 0x0033, 0x0e06, 0x1033, 0x2033, 0x0034, 0x0e07, 0x1034, 0x2034, + 0x0035, 0x0e08, 0x1035, 0x2035, 0x0036, 0x0e09, 0x1036, 0x2036, + 0x0037, 0x0e0a, 0x1037, 0x2037, 0x0038, 0x0e0b, 0x1038, 0x2038, + 0x0039, 0x0f04, 0x1039, 0x2039, 0x003a, 0x0f05, 0x103a, 0x203a, + 0x003b, 0x0f06, 0x103b, 0x203b, 0x003c, 0x0f07, 0x103c, 0x203c, + 0x0801, 0x0f08, 0x103d, 0x203d, 0x1001, 0x0f09, 0x103e, 0x203e, + 0x1801, 0x0f0a, 0x103f, 0x203f, 0x2001, 0x0f0b, 0x1040, 0x2040 +}; + +} // end namespace internal +} // end namespace snappy + +#endif // THIRD_PARTY_SNAPPY_SNAPPY_INTERNAL_H_ diff --git a/other-licenses/snappy/src/snappy-sinksource.cc b/other-licenses/snappy/src/snappy-sinksource.cc new file mode 100644 index 0000000000..369a13215b --- /dev/null +++ b/other-licenses/snappy/src/snappy-sinksource.cc @@ -0,0 +1,104 @@ +// Copyright 2011 Google Inc. All Rights Reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +#include <string.h> + +#include "snappy-sinksource.h" + +namespace snappy { + +Source::~Source() { } + +Sink::~Sink() { } + +char* Sink::GetAppendBuffer(size_t length, char* scratch) { + return scratch; +} + +char* Sink::GetAppendBufferVariable( + size_t min_size, size_t desired_size_hint, char* scratch, + size_t scratch_size, size_t* allocated_size) { + *allocated_size = scratch_size; + return scratch; +} + +void Sink::AppendAndTakeOwnership( + char* bytes, size_t n, + void (*deleter)(void*, const char*, size_t), + void *deleter_arg) { + Append(bytes, n); + (*deleter)(deleter_arg, bytes, n); +} + +ByteArraySource::~ByteArraySource() { } + +size_t ByteArraySource::Available() const { return left_; } + +const char* ByteArraySource::Peek(size_t* len) { + *len = left_; + return ptr_; +} + +void ByteArraySource::Skip(size_t n) { + left_ -= n; + ptr_ += n; +} + +UncheckedByteArraySink::~UncheckedByteArraySink() { } + +void UncheckedByteArraySink::Append(const char* data, size_t n) { + // Do no copying if the caller filled in the result of GetAppendBuffer() + if (data != dest_) { + memcpy(dest_, data, n); + } + dest_ += n; +} + +char* UncheckedByteArraySink::GetAppendBuffer(size_t len, char* scratch) { + return dest_; +} + +void UncheckedByteArraySink::AppendAndTakeOwnership( + char* data, size_t n, + void (*deleter)(void*, const char*, size_t), + void *deleter_arg) { + if (data != dest_) { + memcpy(dest_, data, n); + (*deleter)(deleter_arg, data, n); + } + dest_ += n; +} + +char* UncheckedByteArraySink::GetAppendBufferVariable( + size_t min_size, size_t desired_size_hint, char* scratch, + size_t scratch_size, size_t* allocated_size) { + *allocated_size = desired_size_hint; + return dest_; +} + +} // namespace snappy diff --git a/other-licenses/snappy/src/snappy-sinksource.h b/other-licenses/snappy/src/snappy-sinksource.h new file mode 100644 index 0000000000..8afcdaaa2c --- /dev/null +++ b/other-licenses/snappy/src/snappy-sinksource.h @@ -0,0 +1,182 @@ +// Copyright 2011 Google Inc. All Rights Reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +#ifndef THIRD_PARTY_SNAPPY_SNAPPY_SINKSOURCE_H_ +#define THIRD_PARTY_SNAPPY_SNAPPY_SINKSOURCE_H_ + +#include <stddef.h> + +namespace snappy { + +// A Sink is an interface that consumes a sequence of bytes. +class Sink { + public: + Sink() { } + virtual ~Sink(); + + // Append "bytes[0,n-1]" to this. + virtual void Append(const char* bytes, size_t n) = 0; + + // Returns a writable buffer of the specified length for appending. + // May return a pointer to the caller-owned scratch buffer which + // must have at least the indicated length. The returned buffer is + // only valid until the next operation on this Sink. + // + // After writing at most "length" bytes, call Append() with the + // pointer returned from this function and the number of bytes + // written. Many Append() implementations will avoid copying + // bytes if this function returned an internal buffer. + // + // If a non-scratch buffer is returned, the caller may only pass a + // prefix of it to Append(). That is, it is not correct to pass an + // interior pointer of the returned array to Append(). + // + // The default implementation always returns the scratch buffer. + virtual char* GetAppendBuffer(size_t length, char* scratch); + + // For higher performance, Sink implementations can provide custom + // AppendAndTakeOwnership() and GetAppendBufferVariable() methods. + // These methods can reduce the number of copies done during + // compression/decompression. + + // Append "bytes[0,n-1] to the sink. Takes ownership of "bytes" + // and calls the deleter function as (*deleter)(deleter_arg, bytes, n) + // to free the buffer. deleter function must be non NULL. + // + // The default implementation just calls Append and frees "bytes". + // Other implementations may avoid a copy while appending the buffer. + virtual void AppendAndTakeOwnership( + char* bytes, size_t n, void (*deleter)(void*, const char*, size_t), + void *deleter_arg); + + // Returns a writable buffer for appending and writes the buffer's capacity to + // *allocated_size. Guarantees *allocated_size >= min_size. + // May return a pointer to the caller-owned scratch buffer which must have + // scratch_size >= min_size. + // + // The returned buffer is only valid until the next operation + // on this ByteSink. + // + // After writing at most *allocated_size bytes, call Append() with the + // pointer returned from this function and the number of bytes written. + // Many Append() implementations will avoid copying bytes if this function + // returned an internal buffer. + // + // If the sink implementation allocates or reallocates an internal buffer, + // it should use the desired_size_hint if appropriate. If a caller cannot + // provide a reasonable guess at the desired capacity, it should set + // desired_size_hint = 0. + // + // If a non-scratch buffer is returned, the caller may only pass + // a prefix to it to Append(). That is, it is not correct to pass an + // interior pointer to Append(). + // + // The default implementation always returns the scratch buffer. + virtual char* GetAppendBufferVariable( + size_t min_size, size_t desired_size_hint, char* scratch, + size_t scratch_size, size_t* allocated_size); + + private: + // No copying + Sink(const Sink&); + void operator=(const Sink&); +}; + +// A Source is an interface that yields a sequence of bytes +class Source { + public: + Source() { } + virtual ~Source(); + + // Return the number of bytes left to read from the source + virtual size_t Available() const = 0; + + // Peek at the next flat region of the source. Does not reposition + // the source. The returned region is empty iff Available()==0. + // + // Returns a pointer to the beginning of the region and store its + // length in *len. + // + // The returned region is valid until the next call to Skip() or + // until this object is destroyed, whichever occurs first. + // + // The returned region may be larger than Available() (for example + // if this ByteSource is a view on a substring of a larger source). + // The caller is responsible for ensuring that it only reads the + // Available() bytes. + virtual const char* Peek(size_t* len) = 0; + + // Skip the next n bytes. Invalidates any buffer returned by + // a previous call to Peek(). + // REQUIRES: Available() >= n + virtual void Skip(size_t n) = 0; + + private: + // No copying + Source(const Source&); + void operator=(const Source&); +}; + +// A Source implementation that yields the contents of a flat array +class ByteArraySource : public Source { + public: + ByteArraySource(const char* p, size_t n) : ptr_(p), left_(n) { } + virtual ~ByteArraySource(); + virtual size_t Available() const; + virtual const char* Peek(size_t* len); + virtual void Skip(size_t n); + private: + const char* ptr_; + size_t left_; +}; + +// A Sink implementation that writes to a flat array without any bound checks. +class UncheckedByteArraySink : public Sink { + public: + explicit UncheckedByteArraySink(char* dest) : dest_(dest) { } + virtual ~UncheckedByteArraySink(); + virtual void Append(const char* data, size_t n); + virtual char* GetAppendBuffer(size_t len, char* scratch); + virtual char* GetAppendBufferVariable( + size_t min_size, size_t desired_size_hint, char* scratch, + size_t scratch_size, size_t* allocated_size); + virtual void AppendAndTakeOwnership( + char* bytes, size_t n, void (*deleter)(void*, const char*, size_t), + void *deleter_arg); + + // Return the current output pointer so that a caller can see how + // many bytes were produced. + // Note: this is not a Sink method. + char* CurrentDestination() const { return dest_; } + private: + char* dest_; +}; + +} // namespace snappy + +#endif // THIRD_PARTY_SNAPPY_SNAPPY_SINKSOURCE_H_ diff --git a/other-licenses/snappy/src/snappy-stubs-internal.cc b/other-licenses/snappy/src/snappy-stubs-internal.cc new file mode 100644 index 0000000000..6ed334371f --- /dev/null +++ b/other-licenses/snappy/src/snappy-stubs-internal.cc @@ -0,0 +1,42 @@ +// Copyright 2011 Google Inc. All Rights Reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +#include <algorithm> +#include <string> + +#include "snappy-stubs-internal.h" + +namespace snappy { + +void Varint::Append32(string* s, uint32 value) { + char buf[Varint::kMax32]; + const char* p = Varint::Encode32(buf, value); + s->append(buf, p - buf); +} + +} // namespace snappy diff --git a/other-licenses/snappy/src/snappy-stubs-internal.h b/other-licenses/snappy/src/snappy-stubs-internal.h new file mode 100644 index 0000000000..1954c63da9 --- /dev/null +++ b/other-licenses/snappy/src/snappy-stubs-internal.h @@ -0,0 +1,528 @@ +// Copyright 2011 Google Inc. All Rights Reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +// +// Various stubs for the open-source version of Snappy. + +#ifndef THIRD_PARTY_SNAPPY_OPENSOURCE_SNAPPY_STUBS_INTERNAL_H_ +#define THIRD_PARTY_SNAPPY_OPENSOURCE_SNAPPY_STUBS_INTERNAL_H_ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <string> + +#include <assert.h> +#include <stdlib.h> +#include <string.h> + +#ifdef HAVE_SYS_MMAN_H +#include <sys/mman.h> +#endif + +#include "snappy-stubs-public.h" + +#if defined(__x86_64__) + +// Enable 64-bit optimized versions of some routines. +#define ARCH_K8 1 + +#endif + +// Needed by OS X, among others. +#ifndef MAP_ANONYMOUS +#define MAP_ANONYMOUS MAP_ANON +#endif + +// Pull in std::min, std::ostream, and the likes. This is safe because this +// header file is never used from any public header files. +using namespace std; + +// The size of an array, if known at compile-time. +// Will give unexpected results if used on a pointer. +// We undefine it first, since some compilers already have a definition. +#ifdef ARRAYSIZE +#undef ARRAYSIZE +#endif +#define ARRAYSIZE(a) (sizeof(a) / sizeof(*(a))) + +// Static prediction hints. +#ifdef HAVE_BUILTIN_EXPECT +#define PREDICT_FALSE(x) (__builtin_expect(x, 0)) +#define PREDICT_TRUE(x) (__builtin_expect(!!(x), 1)) +#else +#define PREDICT_FALSE(x) x +#define PREDICT_TRUE(x) x +#endif + +// This is only used for recomputing the tag byte table used during +// decompression; for simplicity we just remove it from the open-source +// version (anyone who wants to regenerate it can just do the call +// themselves within main()). +#define DEFINE_bool(flag_name, default_value, description) \ + bool FLAGS_ ## flag_name = default_value +#define DECLARE_bool(flag_name) \ + extern bool FLAGS_ ## flag_name + +namespace snappy { + +static const uint32 kuint32max = static_cast<uint32>(0xFFFFFFFF); +static const int64 kint64max = static_cast<int64>(0x7FFFFFFFFFFFFFFFLL); + +// Potentially unaligned loads and stores. + +// x86 and PowerPC can simply do these loads and stores native. + +#if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__) + +#define UNALIGNED_LOAD16(_p) (*reinterpret_cast<const uint16 *>(_p)) +#define UNALIGNED_LOAD32(_p) (*reinterpret_cast<const uint32 *>(_p)) +#define UNALIGNED_LOAD64(_p) (*reinterpret_cast<const uint64 *>(_p)) + +#define UNALIGNED_STORE16(_p, _val) (*reinterpret_cast<uint16 *>(_p) = (_val)) +#define UNALIGNED_STORE32(_p, _val) (*reinterpret_cast<uint32 *>(_p) = (_val)) +#define UNALIGNED_STORE64(_p, _val) (*reinterpret_cast<uint64 *>(_p) = (_val)) + +// ARMv7 and newer support native unaligned accesses, but only of 16-bit +// and 32-bit values (not 64-bit); older versions either raise a fatal signal, +// do an unaligned read and rotate the words around a bit, or do the reads very +// slowly (trip through kernel mode). There's no simple #define that says just +// “ARMv7 or higher”, so we have to filter away all ARMv5 and ARMv6 +// sub-architectures. +// +// This is a mess, but there's not much we can do about it. +// +// To further complicate matters, only LDR instructions (single reads) are +// allowed to be unaligned, not LDRD (two reads) or LDM (many reads). Unless we +// explicitly tell the compiler that these accesses can be unaligned, it can and +// will combine accesses. On armcc, the way to signal this is done by accessing +// through the type (uint32 __packed *), but GCC has no such attribute +// (it ignores __attribute__((packed)) on individual variables). However, +// we can tell it that a _struct_ is unaligned, which has the same effect, +// so we do that. + +#elif defined(__arm__) && \ + !defined(__ARM_ARCH_4__) && \ + !defined(__ARM_ARCH_4T__) && \ + !defined(__ARM_ARCH_5__) && \ + !defined(__ARM_ARCH_5T__) && \ + !defined(__ARM_ARCH_5TE__) && \ + !defined(__ARM_ARCH_5TEJ__) && \ + !defined(__ARM_ARCH_6__) && \ + !defined(__ARM_ARCH_6J__) && \ + !defined(__ARM_ARCH_6K__) && \ + !defined(__ARM_ARCH_6Z__) && \ + !defined(__ARM_ARCH_6ZK__) && \ + !defined(__ARM_ARCH_6T2__) + +#if __GNUC__ +#define ATTRIBUTE_PACKED __attribute__((__packed__)) +#else +#define ATTRIBUTE_PACKED +#endif + +namespace base { +namespace internal { + +struct Unaligned16Struct { + uint16 value; + uint8 dummy; // To make the size non-power-of-two. +} ATTRIBUTE_PACKED; + +struct Unaligned32Struct { + uint32 value; + uint8 dummy; // To make the size non-power-of-two. +} ATTRIBUTE_PACKED; + +} // namespace internal +} // namespace base + +#define UNALIGNED_LOAD16(_p) \ + ((reinterpret_cast<const ::snappy::base::internal::Unaligned16Struct *>(_p))->value) +#define UNALIGNED_LOAD32(_p) \ + ((reinterpret_cast<const ::snappy::base::internal::Unaligned32Struct *>(_p))->value) + +#define UNALIGNED_STORE16(_p, _val) \ + ((reinterpret_cast< ::snappy::base::internal::Unaligned16Struct *>(_p))->value = \ + (_val)) +#define UNALIGNED_STORE32(_p, _val) \ + ((reinterpret_cast< ::snappy::base::internal::Unaligned32Struct *>(_p))->value = \ + (_val)) + +// TODO(user): NEON supports unaligned 64-bit loads and stores. +// See if that would be more efficient on platforms supporting it, +// at least for copies. + +inline uint64 UNALIGNED_LOAD64(const void *p) { + uint64 t; + memcpy(&t, p, sizeof t); + return t; +} + +inline void UNALIGNED_STORE64(void *p, uint64 v) { + memcpy(p, &v, sizeof v); +} + +#else + +// These functions are provided for architectures that don't support +// unaligned loads and stores. + +inline uint16 UNALIGNED_LOAD16(const void *p) { + uint16 t; + memcpy(&t, p, sizeof t); + return t; +} + +inline uint32 UNALIGNED_LOAD32(const void *p) { + uint32 t; + memcpy(&t, p, sizeof t); + return t; +} + +inline uint64 UNALIGNED_LOAD64(const void *p) { + uint64 t; + memcpy(&t, p, sizeof t); + return t; +} + +inline void UNALIGNED_STORE16(void *p, uint16 v) { + memcpy(p, &v, sizeof v); +} + +inline void UNALIGNED_STORE32(void *p, uint32 v) { + memcpy(p, &v, sizeof v); +} + +inline void UNALIGNED_STORE64(void *p, uint64 v) { + memcpy(p, &v, sizeof v); +} + +#endif + +// This can be more efficient than UNALIGNED_LOAD64 + UNALIGNED_STORE64 +// on some platforms, in particular ARM. +inline void UnalignedCopy64(const void *src, void *dst) { + if (sizeof(void *) == 8) { + UNALIGNED_STORE64(dst, UNALIGNED_LOAD64(src)); + } else { + const char *src_char = reinterpret_cast<const char *>(src); + char *dst_char = reinterpret_cast<char *>(dst); + + UNALIGNED_STORE32(dst_char, UNALIGNED_LOAD32(src_char)); + UNALIGNED_STORE32(dst_char + 4, UNALIGNED_LOAD32(src_char + 4)); + } +} + +// The following guarantees declaration of the byte swap functions. +#ifdef WORDS_BIGENDIAN + +#ifdef HAVE_SYS_BYTEORDER_H +#include <sys/byteorder.h> +#endif + +#ifdef HAVE_SYS_ENDIAN_H +#include <sys/endian.h> +#endif + +#ifdef _MSC_VER +#include <stdlib.h> +#define bswap_16(x) _byteswap_ushort(x) +#define bswap_32(x) _byteswap_ulong(x) +#define bswap_64(x) _byteswap_uint64(x) + +#elif defined(__APPLE__) +// Mac OS X / Darwin features +#include <libkern/OSByteOrder.h> +#define bswap_16(x) OSSwapInt16(x) +#define bswap_32(x) OSSwapInt32(x) +#define bswap_64(x) OSSwapInt64(x) + +#elif defined(HAVE_BYTESWAP_H) +#include <byteswap.h> + +#elif defined(bswap32) +// FreeBSD defines bswap{16,32,64} in <sys/endian.h> (already #included). +#define bswap_16(x) bswap16(x) +#define bswap_32(x) bswap32(x) +#define bswap_64(x) bswap64(x) + +#elif defined(BSWAP_64) +// Solaris 10 defines BSWAP_{16,32,64} in <sys/byteorder.h> (already #included). +#define bswap_16(x) BSWAP_16(x) +#define bswap_32(x) BSWAP_32(x) +#define bswap_64(x) BSWAP_64(x) + +#else + +inline uint16 bswap_16(uint16 x) { + return (x << 8) | (x >> 8); +} + +inline uint32 bswap_32(uint32 x) { + x = ((x & 0xff00ff00UL) >> 8) | ((x & 0x00ff00ffUL) << 8); + return (x >> 16) | (x << 16); +} + +inline uint64 bswap_64(uint64 x) { + x = ((x & 0xff00ff00ff00ff00ULL) >> 8) | ((x & 0x00ff00ff00ff00ffULL) << 8); + x = ((x & 0xffff0000ffff0000ULL) >> 16) | ((x & 0x0000ffff0000ffffULL) << 16); + return (x >> 32) | (x << 32); +} + +#endif + +#endif // WORDS_BIGENDIAN + +// Convert to little-endian storage, opposite of network format. +// Convert x from host to little endian: x = LittleEndian.FromHost(x); +// convert x from little endian to host: x = LittleEndian.ToHost(x); +// +// Store values into unaligned memory converting to little endian order: +// LittleEndian.Store16(p, x); +// +// Load unaligned values stored in little endian converting to host order: +// x = LittleEndian.Load16(p); +class LittleEndian { + public: + // Conversion functions. +#ifdef WORDS_BIGENDIAN + + static uint16 FromHost16(uint16 x) { return bswap_16(x); } + static uint16 ToHost16(uint16 x) { return bswap_16(x); } + + static uint32 FromHost32(uint32 x) { return bswap_32(x); } + static uint32 ToHost32(uint32 x) { return bswap_32(x); } + + static bool IsLittleEndian() { return false; } + +#else // !defined(WORDS_BIGENDIAN) + + static uint16 FromHost16(uint16 x) { return x; } + static uint16 ToHost16(uint16 x) { return x; } + + static uint32 FromHost32(uint32 x) { return x; } + static uint32 ToHost32(uint32 x) { return x; } + + static bool IsLittleEndian() { return true; } + +#endif // !defined(WORDS_BIGENDIAN) + + // Functions to do unaligned loads and stores in little-endian order. + static uint16 Load16(const void *p) { + return ToHost16(UNALIGNED_LOAD16(p)); + } + + static void Store16(void *p, uint16 v) { + UNALIGNED_STORE16(p, FromHost16(v)); + } + + static uint32 Load32(const void *p) { + return ToHost32(UNALIGNED_LOAD32(p)); + } + + static void Store32(void *p, uint32 v) { + UNALIGNED_STORE32(p, FromHost32(v)); + } +}; + +// Some bit-manipulation functions. +class Bits { + public: + // Return floor(log2(n)) for positive integer n. Returns -1 iff n == 0. + static int Log2Floor(uint32 n); + + // Return the first set least / most significant bit, 0-indexed. Returns an + // undefined value if n == 0. FindLSBSetNonZero() is similar to ffs() except + // that it's 0-indexed. + static int FindLSBSetNonZero(uint32 n); + static int FindLSBSetNonZero64(uint64 n); + + private: + DISALLOW_COPY_AND_ASSIGN(Bits); +}; + +#ifdef HAVE_BUILTIN_CTZ + +inline int Bits::Log2Floor(uint32 n) { + return n == 0 ? -1 : 31 ^ __builtin_clz(n); +} + +inline int Bits::FindLSBSetNonZero(uint32 n) { + return __builtin_ctz(n); +} + +inline int Bits::FindLSBSetNonZero64(uint64 n) { + return __builtin_ctzll(n); +} + +#else // Portable versions. + +inline int Bits::Log2Floor(uint32 n) { + if (n == 0) + return -1; + int log = 0; + uint32 value = n; + for (int i = 4; i >= 0; --i) { + int shift = (1 << i); + uint32 x = value >> shift; + if (x != 0) { + value = x; + log += shift; + } + } + assert(value == 1); + return log; +} + +inline int Bits::FindLSBSetNonZero(uint32 n) { + int rc = 31; + for (int i = 4, shift = 1 << 4; i >= 0; --i) { + const uint32 x = n << shift; + if (x != 0) { + n = x; + rc -= shift; + } + shift >>= 1; + } + return rc; +} + +// FindLSBSetNonZero64() is defined in terms of FindLSBSetNonZero(). +inline int Bits::FindLSBSetNonZero64(uint64 n) { + const uint32 bottombits = static_cast<uint32>(n); + if (bottombits == 0) { + // Bottom bits are zero, so scan in top bits + return 32 + FindLSBSetNonZero(static_cast<uint32>(n >> 32)); + } else { + return FindLSBSetNonZero(bottombits); + } +} + +#endif // End portable versions. + +// Variable-length integer encoding. +class Varint { + public: + // Maximum lengths of varint encoding of uint32. + static const int kMax32 = 5; + + // Attempts to parse a varint32 from a prefix of the bytes in [ptr,limit-1]. + // Never reads a character at or beyond limit. If a valid/terminated varint32 + // was found in the range, stores it in *OUTPUT and returns a pointer just + // past the last byte of the varint32. Else returns NULL. On success, + // "result <= limit". + static const char* Parse32WithLimit(const char* ptr, const char* limit, + uint32* OUTPUT); + + // REQUIRES "ptr" points to a buffer of length sufficient to hold "v". + // EFFECTS Encodes "v" into "ptr" and returns a pointer to the + // byte just past the last encoded byte. + static char* Encode32(char* ptr, uint32 v); + + // EFFECTS Appends the varint representation of "value" to "*s". + static void Append32(string* s, uint32 value); +}; + +inline const char* Varint::Parse32WithLimit(const char* p, + const char* l, + uint32* OUTPUT) { + const unsigned char* ptr = reinterpret_cast<const unsigned char*>(p); + const unsigned char* limit = reinterpret_cast<const unsigned char*>(l); + uint32 b, result; + if (ptr >= limit) return NULL; + b = *(ptr++); result = b & 127; if (b < 128) goto done; + if (ptr >= limit) return NULL; + b = *(ptr++); result |= (b & 127) << 7; if (b < 128) goto done; + if (ptr >= limit) return NULL; + b = *(ptr++); result |= (b & 127) << 14; if (b < 128) goto done; + if (ptr >= limit) return NULL; + b = *(ptr++); result |= (b & 127) << 21; if (b < 128) goto done; + if (ptr >= limit) return NULL; + b = *(ptr++); result |= (b & 127) << 28; if (b < 16) goto done; + return NULL; // Value is too long to be a varint32 + done: + *OUTPUT = result; + return reinterpret_cast<const char*>(ptr); +} + +inline char* Varint::Encode32(char* sptr, uint32 v) { + // Operate on characters as unsigneds + unsigned char* ptr = reinterpret_cast<unsigned char*>(sptr); + static const int B = 128; + if (v < (1<<7)) { + *(ptr++) = v; + } else if (v < (1<<14)) { + *(ptr++) = v | B; + *(ptr++) = v>>7; + } else if (v < (1<<21)) { + *(ptr++) = v | B; + *(ptr++) = (v>>7) | B; + *(ptr++) = v>>14; + } else if (v < (1<<28)) { + *(ptr++) = v | B; + *(ptr++) = (v>>7) | B; + *(ptr++) = (v>>14) | B; + *(ptr++) = v>>21; + } else { + *(ptr++) = v | B; + *(ptr++) = (v>>7) | B; + *(ptr++) = (v>>14) | B; + *(ptr++) = (v>>21) | B; + *(ptr++) = v>>28; + } + return reinterpret_cast<char*>(ptr); +} + +// If you know the internal layout of the std::string in use, you can +// replace this function with one that resizes the string without +// filling the new space with zeros (if applicable) -- +// it will be non-portable but faster. +inline void STLStringResizeUninitialized(string* s, size_t new_size) { + s->resize(new_size); +} + +// Return a mutable char* pointing to a string's internal buffer, +// which may not be null-terminated. Writing through this pointer will +// modify the string. +// +// string_as_array(&str)[i] is valid for 0 <= i < str.size() until the +// next call to a string method that invalidates iterators. +// +// As of 2006-04, there is no standard-blessed way of getting a +// mutable reference to a string's internal buffer. However, issue 530 +// (http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-defects.html#530) +// proposes this as the method. It will officially be part of the standard +// for C++0x. This should already work on all current implementations. +inline char* string_as_array(string* str) { + return str->empty() ? NULL : &*str->begin(); +} + +} // namespace snappy + +#endif // THIRD_PARTY_SNAPPY_OPENSOURCE_SNAPPY_STUBS_INTERNAL_H_ diff --git a/other-licenses/snappy/src/snappy-stubs-public.h.in b/other-licenses/snappy/src/snappy-stubs-public.h.in new file mode 100644 index 0000000000..96989ac390 --- /dev/null +++ b/other-licenses/snappy/src/snappy-stubs-public.h.in @@ -0,0 +1,100 @@ +// Copyright 2011 Google Inc. All Rights Reserved. +// Author: sesse@google.com (Steinar H. Gunderson) +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +// +// Various type stubs for the open-source version of Snappy. +// +// This file cannot include config.h, as it is included from snappy.h, +// which is a public header. Instead, snappy-stubs-public.h is generated by +// from snappy-stubs-public.h.in at configure time. + +#ifndef THIRD_PARTY_SNAPPY_OPENSOURCE_SNAPPY_STUBS_PUBLIC_H_ +#define THIRD_PARTY_SNAPPY_OPENSOURCE_SNAPPY_STUBS_PUBLIC_H_ + +#if @ac_cv_have_stdint_h@ +#include <stdint.h> +#endif + +#if @ac_cv_have_stddef_h@ +#include <stddef.h> +#endif + +#if @ac_cv_have_sys_uio_h@ +#include <sys/uio.h> +#endif + +#define SNAPPY_MAJOR @SNAPPY_MAJOR@ +#define SNAPPY_MINOR @SNAPPY_MINOR@ +#define SNAPPY_PATCHLEVEL @SNAPPY_PATCHLEVEL@ +#define SNAPPY_VERSION \ + ((SNAPPY_MAJOR << 16) | (SNAPPY_MINOR << 8) | SNAPPY_PATCHLEVEL) + +#include <string> + +namespace snappy { + +#if @ac_cv_have_stdint_h@ +typedef int8_t int8; +typedef uint8_t uint8; +typedef int16_t int16; +typedef uint16_t uint16; +typedef int32_t int32; +typedef uint32_t uint32; +typedef int64_t int64; +typedef uint64_t uint64; +#else +typedef signed char int8; +typedef unsigned char uint8; +typedef short int16; +typedef unsigned short uint16; +typedef int int32; +typedef unsigned int uint32; +typedef long long int64; +typedef unsigned long long uint64; +#endif + +typedef std::string string; + +#ifndef DISALLOW_COPY_AND_ASSIGN +#define DISALLOW_COPY_AND_ASSIGN(TypeName) \ + TypeName(const TypeName&); \ + void operator=(const TypeName&) +#endif + +#if !@ac_cv_have_sys_uio_h@ +// Windows does not have an iovec type, yet the concept is universally useful. +// It is simple to define it ourselves, so we put it inside our own namespace. +struct iovec { + void* iov_base; + size_t iov_len; +}; +#endif + +} // namespace snappy + +#endif // THIRD_PARTY_SNAPPY_OPENSOURCE_SNAPPY_STUBS_PUBLIC_H_ diff --git a/other-licenses/snappy/src/snappy-test.cc b/other-licenses/snappy/src/snappy-test.cc new file mode 100644 index 0000000000..7f1d0a8d1a --- /dev/null +++ b/other-licenses/snappy/src/snappy-test.cc @@ -0,0 +1,609 @@ +// Copyright 2011 Google Inc. All Rights Reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +// +// Various stubs for the unit tests for the open-source version of Snappy. + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#ifdef HAVE_WINDOWS_H +#include <windows.h> +#endif + +#include "snappy-test.h" + +#include <algorithm> + +DEFINE_bool(run_microbenchmarks, true, + "Run microbenchmarks before doing anything else."); + +namespace snappy { + +string ReadTestDataFile(const string& base, size_t size_limit) { + string contents; + const char* srcdir = getenv("srcdir"); // This is set by Automake. + string prefix; + if (srcdir) { + prefix = string(srcdir) + "/"; + } + file::GetContents(prefix + "testdata/" + base, &contents, file::Defaults() + ).CheckSuccess(); + if (size_limit > 0) { + contents = contents.substr(0, size_limit); + } + return contents; +} + +string ReadTestDataFile(const string& base) { + return ReadTestDataFile(base, 0); +} + +string StringPrintf(const char* format, ...) { + char buf[4096]; + va_list ap; + va_start(ap, format); + vsnprintf(buf, sizeof(buf), format, ap); + va_end(ap); + return buf; +} + +bool benchmark_running = false; +int64 benchmark_real_time_us = 0; +int64 benchmark_cpu_time_us = 0; +string *benchmark_label = NULL; +int64 benchmark_bytes_processed = 0; + +void ResetBenchmarkTiming() { + benchmark_real_time_us = 0; + benchmark_cpu_time_us = 0; +} + +#ifdef WIN32 +LARGE_INTEGER benchmark_start_real; +FILETIME benchmark_start_cpu; +#else // WIN32 +struct timeval benchmark_start_real; +struct rusage benchmark_start_cpu; +#endif // WIN32 + +void StartBenchmarkTiming() { +#ifdef WIN32 + QueryPerformanceCounter(&benchmark_start_real); + FILETIME dummy; + CHECK(GetProcessTimes( + GetCurrentProcess(), &dummy, &dummy, &dummy, &benchmark_start_cpu)); +#else + gettimeofday(&benchmark_start_real, NULL); + if (getrusage(RUSAGE_SELF, &benchmark_start_cpu) == -1) { + perror("getrusage(RUSAGE_SELF)"); + exit(1); + } +#endif + benchmark_running = true; +} + +void StopBenchmarkTiming() { + if (!benchmark_running) { + return; + } + +#ifdef WIN32 + LARGE_INTEGER benchmark_stop_real; + LARGE_INTEGER benchmark_frequency; + QueryPerformanceCounter(&benchmark_stop_real); + QueryPerformanceFrequency(&benchmark_frequency); + + double elapsed_real = static_cast<double>( + benchmark_stop_real.QuadPart - benchmark_start_real.QuadPart) / + benchmark_frequency.QuadPart; + benchmark_real_time_us += elapsed_real * 1e6 + 0.5; + + FILETIME benchmark_stop_cpu, dummy; + CHECK(GetProcessTimes( + GetCurrentProcess(), &dummy, &dummy, &dummy, &benchmark_stop_cpu)); + + ULARGE_INTEGER start_ulargeint; + start_ulargeint.LowPart = benchmark_start_cpu.dwLowDateTime; + start_ulargeint.HighPart = benchmark_start_cpu.dwHighDateTime; + + ULARGE_INTEGER stop_ulargeint; + stop_ulargeint.LowPart = benchmark_stop_cpu.dwLowDateTime; + stop_ulargeint.HighPart = benchmark_stop_cpu.dwHighDateTime; + + benchmark_cpu_time_us += + (stop_ulargeint.QuadPart - start_ulargeint.QuadPart + 5) / 10; +#else // WIN32 + struct timeval benchmark_stop_real; + gettimeofday(&benchmark_stop_real, NULL); + benchmark_real_time_us += + 1000000 * (benchmark_stop_real.tv_sec - benchmark_start_real.tv_sec); + benchmark_real_time_us += + (benchmark_stop_real.tv_usec - benchmark_start_real.tv_usec); + + struct rusage benchmark_stop_cpu; + if (getrusage(RUSAGE_SELF, &benchmark_stop_cpu) == -1) { + perror("getrusage(RUSAGE_SELF)"); + exit(1); + } + benchmark_cpu_time_us += 1000000 * (benchmark_stop_cpu.ru_utime.tv_sec - + benchmark_start_cpu.ru_utime.tv_sec); + benchmark_cpu_time_us += (benchmark_stop_cpu.ru_utime.tv_usec - + benchmark_start_cpu.ru_utime.tv_usec); +#endif // WIN32 + + benchmark_running = false; +} + +void SetBenchmarkLabel(const string& str) { + if (benchmark_label) { + delete benchmark_label; + } + benchmark_label = new string(str); +} + +void SetBenchmarkBytesProcessed(int64 bytes) { + benchmark_bytes_processed = bytes; +} + +struct BenchmarkRun { + int64 real_time_us; + int64 cpu_time_us; +}; + +struct BenchmarkCompareCPUTime { + bool operator() (const BenchmarkRun& a, const BenchmarkRun& b) const { + return a.cpu_time_us < b.cpu_time_us; + } +}; + +void Benchmark::Run() { + for (int test_case_num = start_; test_case_num <= stop_; ++test_case_num) { + // Run a few iterations first to find out approximately how fast + // the benchmark is. + const int kCalibrateIterations = 100; + ResetBenchmarkTiming(); + StartBenchmarkTiming(); + (*function_)(kCalibrateIterations, test_case_num); + StopBenchmarkTiming(); + + // Let each test case run for about 200ms, but at least as many + // as we used to calibrate. + // Run five times and pick the median. + const int kNumRuns = 5; + const int kMedianPos = kNumRuns / 2; + int num_iterations = 0; + if (benchmark_real_time_us > 0) { + num_iterations = 200000 * kCalibrateIterations / benchmark_real_time_us; + } + num_iterations = max(num_iterations, kCalibrateIterations); + BenchmarkRun benchmark_runs[kNumRuns]; + + for (int run = 0; run < kNumRuns; ++run) { + ResetBenchmarkTiming(); + StartBenchmarkTiming(); + (*function_)(num_iterations, test_case_num); + StopBenchmarkTiming(); + + benchmark_runs[run].real_time_us = benchmark_real_time_us; + benchmark_runs[run].cpu_time_us = benchmark_cpu_time_us; + } + + string heading = StringPrintf("%s/%d", name_.c_str(), test_case_num); + string human_readable_speed; + + nth_element(benchmark_runs, + benchmark_runs + kMedianPos, + benchmark_runs + kNumRuns, + BenchmarkCompareCPUTime()); + int64 real_time_us = benchmark_runs[kMedianPos].real_time_us; + int64 cpu_time_us = benchmark_runs[kMedianPos].cpu_time_us; + if (cpu_time_us <= 0) { + human_readable_speed = "?"; + } else { + int64 bytes_per_second = + benchmark_bytes_processed * 1000000 / cpu_time_us; + if (bytes_per_second < 1024) { + human_readable_speed = StringPrintf("%dB/s", bytes_per_second); + } else if (bytes_per_second < 1024 * 1024) { + human_readable_speed = StringPrintf( + "%.1fkB/s", bytes_per_second / 1024.0f); + } else if (bytes_per_second < 1024 * 1024 * 1024) { + human_readable_speed = StringPrintf( + "%.1fMB/s", bytes_per_second / (1024.0f * 1024.0f)); + } else { + human_readable_speed = StringPrintf( + "%.1fGB/s", bytes_per_second / (1024.0f * 1024.0f * 1024.0f)); + } + } + + fprintf(stderr, +#ifdef WIN32 + "%-18s %10I64d %10I64d %10d %s %s\n", +#else + "%-18s %10lld %10lld %10d %s %s\n", +#endif + heading.c_str(), + static_cast<long long>(real_time_us * 1000 / num_iterations), + static_cast<long long>(cpu_time_us * 1000 / num_iterations), + num_iterations, + human_readable_speed.c_str(), + benchmark_label->c_str()); + } +} + +#ifdef HAVE_LIBZ + +ZLib::ZLib() + : comp_init_(false), + uncomp_init_(false) { + Reinit(); +} + +ZLib::~ZLib() { + if (comp_init_) { deflateEnd(&comp_stream_); } + if (uncomp_init_) { inflateEnd(&uncomp_stream_); } +} + +void ZLib::Reinit() { + compression_level_ = Z_DEFAULT_COMPRESSION; + window_bits_ = MAX_WBITS; + mem_level_ = 8; // DEF_MEM_LEVEL + if (comp_init_) { + deflateEnd(&comp_stream_); + comp_init_ = false; + } + if (uncomp_init_) { + inflateEnd(&uncomp_stream_); + uncomp_init_ = false; + } + first_chunk_ = true; +} + +void ZLib::Reset() { + first_chunk_ = true; +} + +// --------- COMPRESS MODE + +// Initialization method to be called if we hit an error while +// compressing. On hitting an error, call this method before returning +// the error. +void ZLib::CompressErrorInit() { + deflateEnd(&comp_stream_); + comp_init_ = false; + Reset(); +} + +int ZLib::DeflateInit() { + return deflateInit2(&comp_stream_, + compression_level_, + Z_DEFLATED, + window_bits_, + mem_level_, + Z_DEFAULT_STRATEGY); +} + +int ZLib::CompressInit(Bytef *dest, uLongf *destLen, + const Bytef *source, uLong *sourceLen) { + int err; + + comp_stream_.next_in = (Bytef*)source; + comp_stream_.avail_in = (uInt)*sourceLen; + if ((uLong)comp_stream_.avail_in != *sourceLen) return Z_BUF_ERROR; + comp_stream_.next_out = dest; + comp_stream_.avail_out = (uInt)*destLen; + if ((uLong)comp_stream_.avail_out != *destLen) return Z_BUF_ERROR; + + if ( !first_chunk_ ) // only need to set up stream the first time through + return Z_OK; + + if (comp_init_) { // we've already initted it + err = deflateReset(&comp_stream_); + if (err != Z_OK) { + LOG(WARNING) << "ERROR: Can't reset compress object; creating a new one"; + deflateEnd(&comp_stream_); + comp_init_ = false; + } + } + if (!comp_init_) { // first use + comp_stream_.zalloc = (alloc_func)0; + comp_stream_.zfree = (free_func)0; + comp_stream_.opaque = (voidpf)0; + err = DeflateInit(); + if (err != Z_OK) return err; + comp_init_ = true; + } + return Z_OK; +} + +// In a perfect world we'd always have the full buffer to compress +// when the time came, and we could just call Compress(). Alas, we +// want to do chunked compression on our webserver. In this +// application, we compress the header, send it off, then compress the +// results, send them off, then compress the footer. Thus we need to +// use the chunked compression features of zlib. +int ZLib::CompressAtMostOrAll(Bytef *dest, uLongf *destLen, + const Bytef *source, uLong *sourceLen, + int flush_mode) { // Z_FULL_FLUSH or Z_FINISH + int err; + + if ( (err=CompressInit(dest, destLen, source, sourceLen)) != Z_OK ) + return err; + + // This is used to figure out how many bytes we wrote *this chunk* + int compressed_size = comp_stream_.total_out; + + // Some setup happens only for the first chunk we compress in a run + if ( first_chunk_ ) { + first_chunk_ = false; + } + + // flush_mode is Z_FINISH for all mode, Z_SYNC_FLUSH for incremental + // compression. + err = deflate(&comp_stream_, flush_mode); + + *sourceLen = comp_stream_.avail_in; + + if ((err == Z_STREAM_END || err == Z_OK) + && comp_stream_.avail_in == 0 + && comp_stream_.avail_out != 0 ) { + // we processed everything ok and the output buffer was large enough. + ; + } else if (err == Z_STREAM_END && comp_stream_.avail_in > 0) { + return Z_BUF_ERROR; // should never happen + } else if (err != Z_OK && err != Z_STREAM_END && err != Z_BUF_ERROR) { + // an error happened + CompressErrorInit(); + return err; + } else if (comp_stream_.avail_out == 0) { // not enough space + err = Z_BUF_ERROR; + } + + assert(err == Z_OK || err == Z_STREAM_END || err == Z_BUF_ERROR); + if (err == Z_STREAM_END) + err = Z_OK; + + // update the crc and other metadata + compressed_size = comp_stream_.total_out - compressed_size; // delta + *destLen = compressed_size; + + return err; +} + +int ZLib::CompressChunkOrAll(Bytef *dest, uLongf *destLen, + const Bytef *source, uLong sourceLen, + int flush_mode) { // Z_FULL_FLUSH or Z_FINISH + const int ret = + CompressAtMostOrAll(dest, destLen, source, &sourceLen, flush_mode); + if (ret == Z_BUF_ERROR) + CompressErrorInit(); + return ret; +} + +// This routine only initializes the compression stream once. Thereafter, it +// just does a deflateReset on the stream, which should be faster. +int ZLib::Compress(Bytef *dest, uLongf *destLen, + const Bytef *source, uLong sourceLen) { + int err; + if ( (err=CompressChunkOrAll(dest, destLen, source, sourceLen, + Z_FINISH)) != Z_OK ) + return err; + Reset(); // reset for next call to Compress + + return Z_OK; +} + + +// --------- UNCOMPRESS MODE + +int ZLib::InflateInit() { + return inflateInit2(&uncomp_stream_, MAX_WBITS); +} + +// Initialization method to be called if we hit an error while +// uncompressing. On hitting an error, call this method before +// returning the error. +void ZLib::UncompressErrorInit() { + inflateEnd(&uncomp_stream_); + uncomp_init_ = false; + Reset(); +} + +int ZLib::UncompressInit(Bytef *dest, uLongf *destLen, + const Bytef *source, uLong *sourceLen) { + int err; + + uncomp_stream_.next_in = (Bytef*)source; + uncomp_stream_.avail_in = (uInt)*sourceLen; + // Check for source > 64K on 16-bit machine: + if ((uLong)uncomp_stream_.avail_in != *sourceLen) return Z_BUF_ERROR; + + uncomp_stream_.next_out = dest; + uncomp_stream_.avail_out = (uInt)*destLen; + if ((uLong)uncomp_stream_.avail_out != *destLen) return Z_BUF_ERROR; + + if ( !first_chunk_ ) // only need to set up stream the first time through + return Z_OK; + + if (uncomp_init_) { // we've already initted it + err = inflateReset(&uncomp_stream_); + if (err != Z_OK) { + LOG(WARNING) + << "ERROR: Can't reset uncompress object; creating a new one"; + UncompressErrorInit(); + } + } + if (!uncomp_init_) { + uncomp_stream_.zalloc = (alloc_func)0; + uncomp_stream_.zfree = (free_func)0; + uncomp_stream_.opaque = (voidpf)0; + err = InflateInit(); + if (err != Z_OK) return err; + uncomp_init_ = true; + } + return Z_OK; +} + +// If you compressed your data a chunk at a time, with CompressChunk, +// you can uncompress it a chunk at a time with UncompressChunk. +// Only difference bewteen chunked and unchunked uncompression +// is the flush mode we use: Z_SYNC_FLUSH (chunked) or Z_FINISH (unchunked). +int ZLib::UncompressAtMostOrAll(Bytef *dest, uLongf *destLen, + const Bytef *source, uLong *sourceLen, + int flush_mode) { // Z_SYNC_FLUSH or Z_FINISH + int err = Z_OK; + + if ( (err=UncompressInit(dest, destLen, source, sourceLen)) != Z_OK ) { + LOG(WARNING) << "UncompressInit: Error: " << err << " SourceLen: " + << *sourceLen; + return err; + } + + // This is used to figure out how many output bytes we wrote *this chunk*: + const uLong old_total_out = uncomp_stream_.total_out; + + // This is used to figure out how many input bytes we read *this chunk*: + const uLong old_total_in = uncomp_stream_.total_in; + + // Some setup happens only for the first chunk we compress in a run + if ( first_chunk_ ) { + first_chunk_ = false; // so we don't do this again + + // For the first chunk *only* (to avoid infinite troubles), we let + // there be no actual data to uncompress. This sometimes triggers + // when the input is only the gzip header, say. + if ( *sourceLen == 0 ) { + *destLen = 0; + return Z_OK; + } + } + + // We'll uncompress as much as we can. If we end OK great, otherwise + // if we get an error that seems to be the gzip footer, we store the + // gzip footer and return OK, otherwise we return the error. + + // flush_mode is Z_SYNC_FLUSH for chunked mode, Z_FINISH for all mode. + err = inflate(&uncomp_stream_, flush_mode); + + // Figure out how many bytes of the input zlib slurped up: + const uLong bytes_read = uncomp_stream_.total_in - old_total_in; + CHECK_LE(source + bytes_read, source + *sourceLen); + *sourceLen = uncomp_stream_.avail_in; + + if ((err == Z_STREAM_END || err == Z_OK) // everything went ok + && uncomp_stream_.avail_in == 0) { // and we read it all + ; + } else if (err == Z_STREAM_END && uncomp_stream_.avail_in > 0) { + LOG(WARNING) + << "UncompressChunkOrAll: Received some extra data, bytes total: " + << uncomp_stream_.avail_in << " bytes: " + << string(reinterpret_cast<const char *>(uncomp_stream_.next_in), + min(int(uncomp_stream_.avail_in), 20)); + UncompressErrorInit(); + return Z_DATA_ERROR; // what's the extra data for? + } else if (err != Z_OK && err != Z_STREAM_END && err != Z_BUF_ERROR) { + // an error happened + LOG(WARNING) << "UncompressChunkOrAll: Error: " << err + << " avail_out: " << uncomp_stream_.avail_out; + UncompressErrorInit(); + return err; + } else if (uncomp_stream_.avail_out == 0) { + err = Z_BUF_ERROR; + } + + assert(err == Z_OK || err == Z_BUF_ERROR || err == Z_STREAM_END); + if (err == Z_STREAM_END) + err = Z_OK; + + *destLen = uncomp_stream_.total_out - old_total_out; // size for this call + + return err; +} + +int ZLib::UncompressChunkOrAll(Bytef *dest, uLongf *destLen, + const Bytef *source, uLong sourceLen, + int flush_mode) { // Z_SYNC_FLUSH or Z_FINISH + const int ret = + UncompressAtMostOrAll(dest, destLen, source, &sourceLen, flush_mode); + if (ret == Z_BUF_ERROR) + UncompressErrorInit(); + return ret; +} + +int ZLib::UncompressAtMost(Bytef *dest, uLongf *destLen, + const Bytef *source, uLong *sourceLen) { + return UncompressAtMostOrAll(dest, destLen, source, sourceLen, Z_SYNC_FLUSH); +} + +// We make sure we've uncompressed everything, that is, the current +// uncompress stream is at a compressed-buffer-EOF boundary. In gzip +// mode, we also check the gzip footer to make sure we pass the gzip +// consistency checks. We RETURN true iff both types of checks pass. +bool ZLib::UncompressChunkDone() { + assert(!first_chunk_ && uncomp_init_); + // Make sure we're at the end-of-compressed-data point. This means + // if we call inflate with Z_FINISH we won't consume any input or + // write any output + Bytef dummyin, dummyout; + uLongf dummylen = 0; + if ( UncompressChunkOrAll(&dummyout, &dummylen, &dummyin, 0, Z_FINISH) + != Z_OK ) { + return false; + } + + // Make sure that when we exit, we can start a new round of chunks later + Reset(); + + return true; +} + +// Uncompresses the source buffer into the destination buffer. +// The destination buffer must be long enough to hold the entire +// decompressed contents. +// +// We only initialize the uncomp_stream once. Thereafter, we use +// inflateReset, which should be faster. +// +// Returns Z_OK on success, otherwise, it returns a zlib error code. +int ZLib::Uncompress(Bytef *dest, uLongf *destLen, + const Bytef *source, uLong sourceLen) { + int err; + if ( (err=UncompressChunkOrAll(dest, destLen, source, sourceLen, + Z_FINISH)) != Z_OK ) { + Reset(); // let us try to compress again + return err; + } + if ( !UncompressChunkDone() ) // calls Reset() + return Z_DATA_ERROR; + return Z_OK; // stream_end is ok +} + +#endif // HAVE_LIBZ + +} // namespace snappy diff --git a/other-licenses/snappy/src/snappy-test.h b/other-licenses/snappy/src/snappy-test.h new file mode 100644 index 0000000000..5fb09c78cd --- /dev/null +++ b/other-licenses/snappy/src/snappy-test.h @@ -0,0 +1,599 @@ +// Copyright 2011 Google Inc. All Rights Reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +// +// Various stubs for the unit tests for the open-source version of Snappy. + +#ifndef THIRD_PARTY_SNAPPY_OPENSOURCE_SNAPPY_TEST_H_ +#define THIRD_PARTY_SNAPPY_OPENSOURCE_SNAPPY_TEST_H_ + +#include <iostream> +#include <string> + +#include "snappy-stubs-internal.h" + +#include <stdio.h> +#include <stdarg.h> + +#ifdef HAVE_SYS_MMAN_H +#include <sys/mman.h> +#endif + +#ifdef HAVE_SYS_RESOURCE_H +#include <sys/resource.h> +#endif + +#ifdef HAVE_SYS_TIME_H +#include <sys/time.h> +#endif + +#ifdef HAVE_WINDOWS_H +#include <windows.h> +#endif + +#include <string> + +#ifdef HAVE_GTEST + +#include <gtest/gtest.h> +#undef TYPED_TEST +#define TYPED_TEST TEST +#define INIT_GTEST(argc, argv) ::testing::InitGoogleTest(argc, *argv) + +#else + +// Stubs for if the user doesn't have Google Test installed. + +#define TEST(test_case, test_subcase) \ + void Test_ ## test_case ## _ ## test_subcase() +#define INIT_GTEST(argc, argv) + +#define TYPED_TEST TEST +#define EXPECT_EQ CHECK_EQ +#define EXPECT_NE CHECK_NE +#define EXPECT_FALSE(cond) CHECK(!(cond)) + +#endif + +#ifdef HAVE_GFLAGS + +#include <gflags/gflags.h> + +// This is tricky; both gflags and Google Test want to look at the command line +// arguments. Google Test seems to be the most happy with unknown arguments, +// though, so we call it first and hope for the best. +#define InitGoogle(argv0, argc, argv, remove_flags) \ + INIT_GTEST(argc, argv); \ + google::ParseCommandLineFlags(argc, argv, remove_flags); + +#else + +// If we don't have the gflags package installed, these can only be +// changed at compile time. +#define DEFINE_int32(flag_name, default_value, description) \ + static int FLAGS_ ## flag_name = default_value; + +#define InitGoogle(argv0, argc, argv, remove_flags) \ + INIT_GTEST(argc, argv) + +#endif + +#ifdef HAVE_LIBZ +#include "zlib.h" +#endif + +#ifdef HAVE_LIBLZO2 +#include "lzo/lzo1x.h" +#endif + +#ifdef HAVE_LIBLZF +extern "C" { +#include "lzf.h" +} +#endif + +#ifdef HAVE_LIBFASTLZ +#include "fastlz.h" +#endif + +#ifdef HAVE_LIBQUICKLZ +#include "quicklz.h" +#endif + +namespace { + +namespace File { + void Init() { } +} // namespace File + +namespace file { + int Defaults() { return 0; } + + class DummyStatus { + public: + void CheckSuccess() { } + }; + + DummyStatus GetContents(const string& filename, string* data, int unused) { + FILE* fp = fopen(filename.c_str(), "rb"); + if (fp == NULL) { + perror(filename.c_str()); + exit(1); + } + + data->clear(); + while (!feof(fp)) { + char buf[4096]; + size_t ret = fread(buf, 1, 4096, fp); + if (ret == 0 && ferror(fp)) { + perror("fread"); + exit(1); + } + data->append(string(buf, ret)); + } + + fclose(fp); + + return DummyStatus(); + } + + DummyStatus SetContents(const string& filename, + const string& str, + int unused) { + FILE* fp = fopen(filename.c_str(), "wb"); + if (fp == NULL) { + perror(filename.c_str()); + exit(1); + } + + int ret = fwrite(str.data(), str.size(), 1, fp); + if (ret != 1) { + perror("fwrite"); + exit(1); + } + + fclose(fp); + + return DummyStatus(); + } +} // namespace file + +} // namespace + +namespace snappy { + +#define FLAGS_test_random_seed 301 +typedef string TypeParam; + +void Test_CorruptedTest_VerifyCorrupted(); +void Test_Snappy_SimpleTests(); +void Test_Snappy_MaxBlowup(); +void Test_Snappy_RandomData(); +void Test_Snappy_FourByteOffset(); +void Test_SnappyCorruption_TruncatedVarint(); +void Test_SnappyCorruption_UnterminatedVarint(); +void Test_SnappyCorruption_OverflowingVarint(); +void Test_Snappy_ReadPastEndOfBuffer(); +void Test_Snappy_FindMatchLength(); +void Test_Snappy_FindMatchLengthRandom(); + +string ReadTestDataFile(const string& base, size_t size_limit); + +string ReadTestDataFile(const string& base); + +// A sprintf() variant that returns a std::string. +// Not safe for general use due to truncation issues. +string StringPrintf(const char* format, ...); + +// A simple, non-cryptographically-secure random generator. +class ACMRandom { + public: + explicit ACMRandom(uint32 seed) : seed_(seed) {} + + int32 Next(); + + int32 Uniform(int32 n) { + return Next() % n; + } + uint8 Rand8() { + return static_cast<uint8>((Next() >> 1) & 0x000000ff); + } + bool OneIn(int X) { return Uniform(X) == 0; } + + // Skewed: pick "base" uniformly from range [0,max_log] and then + // return "base" random bits. The effect is to pick a number in the + // range [0,2^max_log-1] with bias towards smaller numbers. + int32 Skewed(int max_log); + + private: + static const uint32 M = 2147483647L; // 2^31-1 + uint32 seed_; +}; + +inline int32 ACMRandom::Next() { + static const uint64 A = 16807; // bits 14, 8, 7, 5, 2, 1, 0 + // We are computing + // seed_ = (seed_ * A) % M, where M = 2^31-1 + // + // seed_ must not be zero or M, or else all subsequent computed values + // will be zero or M respectively. For all other values, seed_ will end + // up cycling through every number in [1,M-1] + uint64 product = seed_ * A; + + // Compute (product % M) using the fact that ((x << 31) % M) == x. + seed_ = (product >> 31) + (product & M); + // The first reduction may overflow by 1 bit, so we may need to repeat. + // mod == M is not possible; using > allows the faster sign-bit-based test. + if (seed_ > M) { + seed_ -= M; + } + return seed_; +} + +inline int32 ACMRandom::Skewed(int max_log) { + const int32 base = (Next() - 1) % (max_log+1); + return (Next() - 1) & ((1u << base)-1); +} + +// A wall-time clock. This stub is not super-accurate, nor resistant to the +// system time changing. +class CycleTimer { + public: + CycleTimer() : real_time_us_(0) {} + + void Start() { +#ifdef WIN32 + QueryPerformanceCounter(&start_); +#else + gettimeofday(&start_, NULL); +#endif + } + + void Stop() { +#ifdef WIN32 + LARGE_INTEGER stop; + LARGE_INTEGER frequency; + QueryPerformanceCounter(&stop); + QueryPerformanceFrequency(&frequency); + + double elapsed = static_cast<double>(stop.QuadPart - start_.QuadPart) / + frequency.QuadPart; + real_time_us_ += elapsed * 1e6 + 0.5; +#else + struct timeval stop; + gettimeofday(&stop, NULL); + + real_time_us_ += 1000000 * (stop.tv_sec - start_.tv_sec); + real_time_us_ += (stop.tv_usec - start_.tv_usec); +#endif + } + + double Get() { + return real_time_us_ * 1e-6; + } + + private: + int64 real_time_us_; +#ifdef WIN32 + LARGE_INTEGER start_; +#else + struct timeval start_; +#endif +}; + +// Minimalistic microbenchmark framework. + +typedef void (*BenchmarkFunction)(int, int); + +class Benchmark { + public: + Benchmark(const string& name, BenchmarkFunction function) : + name_(name), function_(function) {} + + Benchmark* DenseRange(int start, int stop) { + start_ = start; + stop_ = stop; + return this; + } + + void Run(); + + private: + const string name_; + const BenchmarkFunction function_; + int start_, stop_; +}; +#define BENCHMARK(benchmark_name) \ + Benchmark* Benchmark_ ## benchmark_name = \ + (new Benchmark(#benchmark_name, benchmark_name)) + +extern Benchmark* Benchmark_BM_UFlat; +extern Benchmark* Benchmark_BM_UIOVec; +extern Benchmark* Benchmark_BM_UValidate; +extern Benchmark* Benchmark_BM_ZFlat; + +void ResetBenchmarkTiming(); +void StartBenchmarkTiming(); +void StopBenchmarkTiming(); +void SetBenchmarkLabel(const string& str); +void SetBenchmarkBytesProcessed(int64 bytes); + +#ifdef HAVE_LIBZ + +// Object-oriented wrapper around zlib. +class ZLib { + public: + ZLib(); + ~ZLib(); + + // Wipe a ZLib object to a virgin state. This differs from Reset() + // in that it also breaks any state. + void Reinit(); + + // Call this to make a zlib buffer as good as new. Here's the only + // case where they differ: + // CompressChunk(a); CompressChunk(b); CompressChunkDone(); vs + // CompressChunk(a); Reset(); CompressChunk(b); CompressChunkDone(); + // You'll want to use Reset(), then, when you interrupt a compress + // (or uncompress) in the middle of a chunk and want to start over. + void Reset(); + + // According to the zlib manual, when you Compress, the destination + // buffer must have size at least src + .1%*src + 12. This function + // helps you calculate that. Augment this to account for a potential + // gzip header and footer, plus a few bytes of slack. + static int MinCompressbufSize(int uncompress_size) { + return uncompress_size + uncompress_size/1000 + 40; + } + + // Compresses the source buffer into the destination buffer. + // sourceLen is the byte length of the source buffer. + // Upon entry, destLen is the total size of the destination buffer, + // which must be of size at least MinCompressbufSize(sourceLen). + // Upon exit, destLen is the actual size of the compressed buffer. + // + // This function can be used to compress a whole file at once if the + // input file is mmap'ed. + // + // Returns Z_OK if success, Z_MEM_ERROR if there was not + // enough memory, Z_BUF_ERROR if there was not enough room in the + // output buffer. Note that if the output buffer is exactly the same + // size as the compressed result, we still return Z_BUF_ERROR. + // (check CL#1936076) + int Compress(Bytef *dest, uLongf *destLen, + const Bytef *source, uLong sourceLen); + + // Uncompresses the source buffer into the destination buffer. + // The destination buffer must be long enough to hold the entire + // decompressed contents. + // + // Returns Z_OK on success, otherwise, it returns a zlib error code. + int Uncompress(Bytef *dest, uLongf *destLen, + const Bytef *source, uLong sourceLen); + + // Uncompress data one chunk at a time -- ie you can call this + // more than once. To get this to work you need to call per-chunk + // and "done" routines. + // + // Returns Z_OK if success, Z_MEM_ERROR if there was not + // enough memory, Z_BUF_ERROR if there was not enough room in the + // output buffer. + + int UncompressAtMost(Bytef *dest, uLongf *destLen, + const Bytef *source, uLong *sourceLen); + + // Checks gzip footer information, as needed. Mostly this just + // makes sure the checksums match. Whenever you call this, it + // will assume the last 8 bytes from the previous UncompressChunk + // call are the footer. Returns true iff everything looks ok. + bool UncompressChunkDone(); + + private: + int InflateInit(); // sets up the zlib inflate structure + int DeflateInit(); // sets up the zlib deflate structure + + // These init the zlib data structures for compressing/uncompressing + int CompressInit(Bytef *dest, uLongf *destLen, + const Bytef *source, uLong *sourceLen); + int UncompressInit(Bytef *dest, uLongf *destLen, + const Bytef *source, uLong *sourceLen); + // Initialization method to be called if we hit an error while + // uncompressing. On hitting an error, call this method before + // returning the error. + void UncompressErrorInit(); + + // Helper function for Compress + int CompressChunkOrAll(Bytef *dest, uLongf *destLen, + const Bytef *source, uLong sourceLen, + int flush_mode); + int CompressAtMostOrAll(Bytef *dest, uLongf *destLen, + const Bytef *source, uLong *sourceLen, + int flush_mode); + + // Likewise for UncompressAndUncompressChunk + int UncompressChunkOrAll(Bytef *dest, uLongf *destLen, + const Bytef *source, uLong sourceLen, + int flush_mode); + + int UncompressAtMostOrAll(Bytef *dest, uLongf *destLen, + const Bytef *source, uLong *sourceLen, + int flush_mode); + + // Initialization method to be called if we hit an error while + // compressing. On hitting an error, call this method before + // returning the error. + void CompressErrorInit(); + + int compression_level_; // compression level + int window_bits_; // log base 2 of the window size used in compression + int mem_level_; // specifies the amount of memory to be used by + // compressor (1-9) + z_stream comp_stream_; // Zlib stream data structure + bool comp_init_; // True if we have initialized comp_stream_ + z_stream uncomp_stream_; // Zlib stream data structure + bool uncomp_init_; // True if we have initialized uncomp_stream_ + + // These are used only with chunked compression. + bool first_chunk_; // true if we need to emit headers with this chunk +}; + +#endif // HAVE_LIBZ + +} // namespace snappy + +DECLARE_bool(run_microbenchmarks); + +static void RunSpecifiedBenchmarks() { + if (!FLAGS_run_microbenchmarks) { + return; + } + + fprintf(stderr, "Running microbenchmarks.\n"); +#ifndef NDEBUG + fprintf(stderr, "WARNING: Compiled with assertions enabled, will be slow.\n"); +#endif +#ifndef __OPTIMIZE__ + fprintf(stderr, "WARNING: Compiled without optimization, will be slow.\n"); +#endif + fprintf(stderr, "Benchmark Time(ns) CPU(ns) Iterations\n"); + fprintf(stderr, "---------------------------------------------------\n"); + + snappy::Benchmark_BM_UFlat->Run(); + snappy::Benchmark_BM_UIOVec->Run(); + snappy::Benchmark_BM_UValidate->Run(); + snappy::Benchmark_BM_ZFlat->Run(); + + fprintf(stderr, "\n"); +} + +#ifndef HAVE_GTEST + +static inline int RUN_ALL_TESTS() { + fprintf(stderr, "Running correctness tests.\n"); + snappy::Test_CorruptedTest_VerifyCorrupted(); + snappy::Test_Snappy_SimpleTests(); + snappy::Test_Snappy_MaxBlowup(); + snappy::Test_Snappy_RandomData(); + snappy::Test_Snappy_FourByteOffset(); + snappy::Test_SnappyCorruption_TruncatedVarint(); + snappy::Test_SnappyCorruption_UnterminatedVarint(); + snappy::Test_SnappyCorruption_OverflowingVarint(); + snappy::Test_Snappy_ReadPastEndOfBuffer(); + snappy::Test_Snappy_FindMatchLength(); + snappy::Test_Snappy_FindMatchLengthRandom(); + fprintf(stderr, "All tests passed.\n"); + + return 0; +} + +#endif // HAVE_GTEST + +// For main(). +namespace snappy { + +static void CompressFile(const char* fname); +static void UncompressFile(const char* fname); +static void MeasureFile(const char* fname); + +// Logging. + +#define LOG(level) LogMessage() +#define VLOG(level) true ? (void)0 : \ + snappy::LogMessageVoidify() & snappy::LogMessage() + +class LogMessage { + public: + LogMessage() { } + ~LogMessage() { + cerr << endl; + } + + LogMessage& operator<<(const std::string& msg) { + cerr << msg; + return *this; + } + LogMessage& operator<<(int x) { + cerr << x; + return *this; + } +}; + +// Asserts, both versions activated in debug mode only, +// and ones that are always active. + +#define CRASH_UNLESS(condition) \ + PREDICT_TRUE(condition) ? (void)0 : \ + snappy::LogMessageVoidify() & snappy::LogMessageCrash() + +#ifdef _MSC_VER +// ~LogMessageCrash calls abort() and therefore never exits. This is by design +// so temporarily disable warning C4722. +#pragma warning(push) +#pragma warning(disable:4722) +#endif + +class LogMessageCrash : public LogMessage { + public: + LogMessageCrash() { } + ~LogMessageCrash() { + cerr << endl; + abort(); + } +}; + +#ifdef _MSC_VER +#pragma warning(pop) +#endif + +// This class is used to explicitly ignore values in the conditional +// logging macros. This avoids compiler warnings like "value computed +// is not used" and "statement has no effect". + +class LogMessageVoidify { + public: + LogMessageVoidify() { } + // This has to be an operator with a precedence lower than << but + // higher than ?: + void operator&(const LogMessage&) { } +}; + +#define CHECK(cond) CRASH_UNLESS(cond) +#define CHECK_LE(a, b) CRASH_UNLESS((a) <= (b)) +#define CHECK_GE(a, b) CRASH_UNLESS((a) >= (b)) +#define CHECK_EQ(a, b) CRASH_UNLESS((a) == (b)) +#define CHECK_NE(a, b) CRASH_UNLESS((a) != (b)) +#define CHECK_LT(a, b) CRASH_UNLESS((a) < (b)) +#define CHECK_GT(a, b) CRASH_UNLESS((a) > (b)) +#define CHECK_OK(cond) (cond).CheckSuccess() + +} // namespace + +using snappy::CompressFile; +using snappy::UncompressFile; +using snappy::MeasureFile; + +#endif // THIRD_PARTY_SNAPPY_OPENSOURCE_SNAPPY_TEST_H_ diff --git a/other-licenses/snappy/src/snappy.cc b/other-licenses/snappy/src/snappy.cc new file mode 100644 index 0000000000..8a3668c693 --- /dev/null +++ b/other-licenses/snappy/src/snappy.cc @@ -0,0 +1,1400 @@ +// Copyright 2005 Google Inc. All Rights Reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +#include "snappy.h" +#include "snappy-internal.h" +#include "snappy-sinksource.h" + +#include <stdio.h> + +#include <algorithm> +#include <string> +#include <vector> + + +namespace snappy { + +using internal::COPY_1_BYTE_OFFSET; +using internal::COPY_2_BYTE_OFFSET; +using internal::COPY_4_BYTE_OFFSET; +using internal::LITERAL; +using internal::char_table; +using internal::kMaximumTagLength; +using internal::wordmask; + +// Any hash function will produce a valid compressed bitstream, but a good +// hash function reduces the number of collisions and thus yields better +// compression for compressible input, and more speed for incompressible +// input. Of course, it doesn't hurt if the hash function is reasonably fast +// either, as it gets called a lot. +static inline uint32 HashBytes(uint32 bytes, int shift) { + uint32 kMul = 0x1e35a7bd; + return (bytes * kMul) >> shift; +} +static inline uint32 Hash(const char* p, int shift) { + return HashBytes(UNALIGNED_LOAD32(p), shift); +} + +size_t MaxCompressedLength(size_t source_len) { + // Compressed data can be defined as: + // compressed := item* literal* + // item := literal* copy + // + // The trailing literal sequence has a space blowup of at most 62/60 + // since a literal of length 60 needs one tag byte + one extra byte + // for length information. + // + // Item blowup is trickier to measure. Suppose the "copy" op copies + // 4 bytes of data. Because of a special check in the encoding code, + // we produce a 4-byte copy only if the offset is < 65536. Therefore + // the copy op takes 3 bytes to encode, and this type of item leads + // to at most the 62/60 blowup for representing literals. + // + // Suppose the "copy" op copies 5 bytes of data. If the offset is big + // enough, it will take 5 bytes to encode the copy op. Therefore the + // worst case here is a one-byte literal followed by a five-byte copy. + // I.e., 6 bytes of input turn into 7 bytes of "compressed" data. + // + // This last factor dominates the blowup, so the final estimate is: + return 32 + source_len + source_len/6; +} + +// Copy "len" bytes from "src" to "op", one byte at a time. Used for +// handling COPY operations where the input and output regions may +// overlap. For example, suppose: +// src == "ab" +// op == src + 2 +// len == 20 +// After IncrementalCopy(src, op, len), the result will have +// eleven copies of "ab" +// ababababababababababab +// Note that this does not match the semantics of either memcpy() +// or memmove(). +static inline void IncrementalCopy(const char* src, char* op, ssize_t len) { + assert(len > 0); + do { + *op++ = *src++; + } while (--len > 0); +} + +// Equivalent to IncrementalCopy except that it can write up to ten extra +// bytes after the end of the copy, and that it is faster. +// +// The main part of this loop is a simple copy of eight bytes at a time until +// we've copied (at least) the requested amount of bytes. However, if op and +// src are less than eight bytes apart (indicating a repeating pattern of +// length < 8), we first need to expand the pattern in order to get the correct +// results. For instance, if the buffer looks like this, with the eight-byte +// <src> and <op> patterns marked as intervals: +// +// abxxxxxxxxxxxx +// [------] src +// [------] op +// +// a single eight-byte copy from <src> to <op> will repeat the pattern once, +// after which we can move <op> two bytes without moving <src>: +// +// ababxxxxxxxxxx +// [------] src +// [------] op +// +// and repeat the exercise until the two no longer overlap. +// +// This allows us to do very well in the special case of one single byte +// repeated many times, without taking a big hit for more general cases. +// +// The worst case of extra writing past the end of the match occurs when +// op - src == 1 and len == 1; the last copy will read from byte positions +// [0..7] and write to [4..11], whereas it was only supposed to write to +// position 1. Thus, ten excess bytes. + +namespace { + +const int kMaxIncrementCopyOverflow = 10; + +inline void IncrementalCopyFastPath(const char* src, char* op, ssize_t len) { + while (PREDICT_FALSE(op - src < 8)) { + UnalignedCopy64(src, op); + len -= op - src; + op += op - src; + } + while (len > 0) { + UnalignedCopy64(src, op); + src += 8; + op += 8; + len -= 8; + } +} + +} // namespace + +static inline char* EmitLiteral(char* op, + const char* literal, + int len, + bool allow_fast_path) { + int n = len - 1; // Zero-length literals are disallowed + if (n < 60) { + // Fits in tag byte + *op++ = LITERAL | (n << 2); + + // The vast majority of copies are below 16 bytes, for which a + // call to memcpy is overkill. This fast path can sometimes + // copy up to 15 bytes too much, but that is okay in the + // main loop, since we have a bit to go on for both sides: + // + // - The input will always have kInputMarginBytes = 15 extra + // available bytes, as long as we're in the main loop, and + // if not, allow_fast_path = false. + // - The output will always have 32 spare bytes (see + // MaxCompressedLength). + if (allow_fast_path && len <= 16) { + UnalignedCopy64(literal, op); + UnalignedCopy64(literal + 8, op + 8); + return op + len; + } + } else { + // Encode in upcoming bytes + char* base = op; + int count = 0; + op++; + while (n > 0) { + *op++ = n & 0xff; + n >>= 8; + count++; + } + assert(count >= 1); + assert(count <= 4); + *base = LITERAL | ((59+count) << 2); + } + memcpy(op, literal, len); + return op + len; +} + +static inline char* EmitCopyLessThan64(char* op, size_t offset, int len) { + assert(len <= 64); + assert(len >= 4); + assert(offset < 65536); + + if ((len < 12) && (offset < 2048)) { + size_t len_minus_4 = len - 4; + assert(len_minus_4 < 8); // Must fit in 3 bits + *op++ = COPY_1_BYTE_OFFSET + ((len_minus_4) << 2) + ((offset >> 8) << 5); + *op++ = offset & 0xff; + } else { + *op++ = COPY_2_BYTE_OFFSET + ((len-1) << 2); + LittleEndian::Store16(op, offset); + op += 2; + } + return op; +} + +static inline char* EmitCopy(char* op, size_t offset, int len) { + // Emit 64 byte copies but make sure to keep at least four bytes reserved + while (PREDICT_FALSE(len >= 68)) { + op = EmitCopyLessThan64(op, offset, 64); + len -= 64; + } + + // Emit an extra 60 byte copy if have too much data to fit in one copy + if (len > 64) { + op = EmitCopyLessThan64(op, offset, 60); + len -= 60; + } + + // Emit remainder + op = EmitCopyLessThan64(op, offset, len); + return op; +} + + +bool GetUncompressedLength(const char* start, size_t n, size_t* result) { + uint32 v = 0; + const char* limit = start + n; + if (Varint::Parse32WithLimit(start, limit, &v) != NULL) { + *result = v; + return true; + } else { + return false; + } +} + +namespace internal { +uint16* WorkingMemory::GetHashTable(size_t input_size, int* table_size) { + // Use smaller hash table when input.size() is smaller, since we + // fill the table, incurring O(hash table size) overhead for + // compression, and if the input is short, we won't need that + // many hash table entries anyway. + assert(kMaxHashTableSize >= 256); + size_t htsize = 256; + while (htsize < kMaxHashTableSize && htsize < input_size) { + htsize <<= 1; + } + + uint16* table; + if (htsize <= ARRAYSIZE(small_table_)) { + table = small_table_; + } else { + if (large_table_ == NULL) { + large_table_ = new uint16[kMaxHashTableSize]; + } + table = large_table_; + } + + *table_size = htsize; + memset(table, 0, htsize * sizeof(*table)); + return table; +} +} // end namespace internal + +// For 0 <= offset <= 4, GetUint32AtOffset(GetEightBytesAt(p), offset) will +// equal UNALIGNED_LOAD32(p + offset). Motivation: On x86-64 hardware we have +// empirically found that overlapping loads such as +// UNALIGNED_LOAD32(p) ... UNALIGNED_LOAD32(p+1) ... UNALIGNED_LOAD32(p+2) +// are slower than UNALIGNED_LOAD64(p) followed by shifts and casts to uint32. +// +// We have different versions for 64- and 32-bit; ideally we would avoid the +// two functions and just inline the UNALIGNED_LOAD64 call into +// GetUint32AtOffset, but GCC (at least not as of 4.6) is seemingly not clever +// enough to avoid loading the value multiple times then. For 64-bit, the load +// is done when GetEightBytesAt() is called, whereas for 32-bit, the load is +// done at GetUint32AtOffset() time. + +#ifdef ARCH_K8 + +typedef uint64 EightBytesReference; + +static inline EightBytesReference GetEightBytesAt(const char* ptr) { + return UNALIGNED_LOAD64(ptr); +} + +static inline uint32 GetUint32AtOffset(uint64 v, int offset) { + assert(offset >= 0); + assert(offset <= 4); + return v >> (LittleEndian::IsLittleEndian() ? 8 * offset : 32 - 8 * offset); +} + +#else + +typedef const char* EightBytesReference; + +static inline EightBytesReference GetEightBytesAt(const char* ptr) { + return ptr; +} + +static inline uint32 GetUint32AtOffset(const char* v, int offset) { + assert(offset >= 0); + assert(offset <= 4); + return UNALIGNED_LOAD32(v + offset); +} + +#endif + +// Flat array compression that does not emit the "uncompressed length" +// prefix. Compresses "input" string to the "*op" buffer. +// +// REQUIRES: "input" is at most "kBlockSize" bytes long. +// REQUIRES: "op" points to an array of memory that is at least +// "MaxCompressedLength(input.size())" in size. +// REQUIRES: All elements in "table[0..table_size-1]" are initialized to zero. +// REQUIRES: "table_size" is a power of two +// +// Returns an "end" pointer into "op" buffer. +// "end - op" is the compressed size of "input". +namespace internal { +char* CompressFragment(const char* input, + size_t input_size, + char* op, + uint16* table, + const int table_size) { + // "ip" is the input pointer, and "op" is the output pointer. + const char* ip = input; + assert(input_size <= kBlockSize); + assert((table_size & (table_size - 1)) == 0); // table must be power of two + const int shift = 32 - Bits::Log2Floor(table_size); + assert(static_cast<int>(kuint32max >> shift) == table_size - 1); + const char* ip_end = input + input_size; + const char* base_ip = ip; + // Bytes in [next_emit, ip) will be emitted as literal bytes. Or + // [next_emit, ip_end) after the main loop. + const char* next_emit = ip; + + const size_t kInputMarginBytes = 15; + if (PREDICT_TRUE(input_size >= kInputMarginBytes)) { + const char* ip_limit = input + input_size - kInputMarginBytes; + + for (uint32 next_hash = Hash(++ip, shift); ; ) { + assert(next_emit < ip); + // The body of this loop calls EmitLiteral once and then EmitCopy one or + // more times. (The exception is that when we're close to exhausting + // the input we goto emit_remainder.) + // + // In the first iteration of this loop we're just starting, so + // there's nothing to copy, so calling EmitLiteral once is + // necessary. And we only start a new iteration when the + // current iteration has determined that a call to EmitLiteral will + // precede the next call to EmitCopy (if any). + // + // Step 1: Scan forward in the input looking for a 4-byte-long match. + // If we get close to exhausting the input then goto emit_remainder. + // + // Heuristic match skipping: If 32 bytes are scanned with no matches + // found, start looking only at every other byte. If 32 more bytes are + // scanned (or skipped), look at every third byte, etc.. When a match is + // found, immediately go back to looking at every byte. This is a small + // loss (~5% performance, ~0.1% density) for compressible data due to more + // bookkeeping, but for non-compressible data (such as JPEG) it's a huge + // win since the compressor quickly "realizes" the data is incompressible + // and doesn't bother looking for matches everywhere. + // + // The "skip" variable keeps track of how many bytes there are since the + // last match; dividing it by 32 (ie. right-shifting by five) gives the + // number of bytes to move ahead for each iteration. + uint32 skip = 32; + + const char* next_ip = ip; + const char* candidate; + do { + ip = next_ip; + uint32 hash = next_hash; + assert(hash == Hash(ip, shift)); + uint32 bytes_between_hash_lookups = skip >> 5; + skip += bytes_between_hash_lookups; + next_ip = ip + bytes_between_hash_lookups; + if (PREDICT_FALSE(next_ip > ip_limit)) { + goto emit_remainder; + } + next_hash = Hash(next_ip, shift); + candidate = base_ip + table[hash]; + assert(candidate >= base_ip); + assert(candidate < ip); + + table[hash] = ip - base_ip; + } while (PREDICT_TRUE(UNALIGNED_LOAD32(ip) != + UNALIGNED_LOAD32(candidate))); + + // Step 2: A 4-byte match has been found. We'll later see if more + // than 4 bytes match. But, prior to the match, input + // bytes [next_emit, ip) are unmatched. Emit them as "literal bytes." + assert(next_emit + 16 <= ip_end); + op = EmitLiteral(op, next_emit, ip - next_emit, true); + + // Step 3: Call EmitCopy, and then see if another EmitCopy could + // be our next move. Repeat until we find no match for the + // input immediately after what was consumed by the last EmitCopy call. + // + // If we exit this loop normally then we need to call EmitLiteral next, + // though we don't yet know how big the literal will be. We handle that + // by proceeding to the next iteration of the main loop. We also can exit + // this loop via goto if we get close to exhausting the input. + EightBytesReference input_bytes; + uint32 candidate_bytes = 0; + + do { + // We have a 4-byte match at ip, and no need to emit any + // "literal bytes" prior to ip. + const char* base = ip; + int matched = 4 + FindMatchLength(candidate + 4, ip + 4, ip_end); + ip += matched; + size_t offset = base - candidate; + assert(0 == memcmp(base, candidate, matched)); + op = EmitCopy(op, offset, matched); + // We could immediately start working at ip now, but to improve + // compression we first update table[Hash(ip - 1, ...)]. + const char* insert_tail = ip - 1; + next_emit = ip; + if (PREDICT_FALSE(ip >= ip_limit)) { + goto emit_remainder; + } + input_bytes = GetEightBytesAt(insert_tail); + uint32 prev_hash = HashBytes(GetUint32AtOffset(input_bytes, 0), shift); + table[prev_hash] = ip - base_ip - 1; + uint32 cur_hash = HashBytes(GetUint32AtOffset(input_bytes, 1), shift); + candidate = base_ip + table[cur_hash]; + candidate_bytes = UNALIGNED_LOAD32(candidate); + table[cur_hash] = ip - base_ip; + } while (GetUint32AtOffset(input_bytes, 1) == candidate_bytes); + + next_hash = HashBytes(GetUint32AtOffset(input_bytes, 2), shift); + ++ip; + } + } + + emit_remainder: + // Emit the remaining bytes as a literal + if (next_emit < ip_end) { + op = EmitLiteral(op, next_emit, ip_end - next_emit, false); + } + + return op; +} +} // end namespace internal + +// Signature of output types needed by decompression code. +// The decompression code is templatized on a type that obeys this +// signature so that we do not pay virtual function call overhead in +// the middle of a tight decompression loop. +// +// class DecompressionWriter { +// public: +// // Called before decompression +// void SetExpectedLength(size_t length); +// +// // Called after decompression +// bool CheckLength() const; +// +// // Called repeatedly during decompression +// bool Append(const char* ip, size_t length); +// bool AppendFromSelf(uint32 offset, size_t length); +// +// // The rules for how TryFastAppend differs from Append are somewhat +// // convoluted: +// // +// // - TryFastAppend is allowed to decline (return false) at any +// // time, for any reason -- just "return false" would be +// // a perfectly legal implementation of TryFastAppend. +// // The intention is for TryFastAppend to allow a fast path +// // in the common case of a small append. +// // - TryFastAppend is allowed to read up to <available> bytes +// // from the input buffer, whereas Append is allowed to read +// // <length>. However, if it returns true, it must leave +// // at least five (kMaximumTagLength) bytes in the input buffer +// // afterwards, so that there is always enough space to read the +// // next tag without checking for a refill. +// // - TryFastAppend must always return decline (return false) +// // if <length> is 61 or more, as in this case the literal length is not +// // decoded fully. In practice, this should not be a big problem, +// // as it is unlikely that one would implement a fast path accepting +// // this much data. +// // +// bool TryFastAppend(const char* ip, size_t available, size_t length); +// }; + + +// Helper class for decompression +class SnappyDecompressor { + private: + Source* reader_; // Underlying source of bytes to decompress + const char* ip_; // Points to next buffered byte + const char* ip_limit_; // Points just past buffered bytes + uint32 peeked_; // Bytes peeked from reader (need to skip) + bool eof_; // Hit end of input without an error? + char scratch_[kMaximumTagLength]; // See RefillTag(). + + // Ensure that all of the tag metadata for the next tag is available + // in [ip_..ip_limit_-1]. Also ensures that [ip,ip+4] is readable even + // if (ip_limit_ - ip_ < 5). + // + // Returns true on success, false on error or end of input. + bool RefillTag(); + + public: + explicit SnappyDecompressor(Source* reader) + : reader_(reader), + ip_(NULL), + ip_limit_(NULL), + peeked_(0), + eof_(false) { + } + + ~SnappyDecompressor() { + // Advance past any bytes we peeked at from the reader + reader_->Skip(peeked_); + } + + // Returns true iff we have hit the end of the input without an error. + bool eof() const { + return eof_; + } + + // Read the uncompressed length stored at the start of the compressed data. + // On succcess, stores the length in *result and returns true. + // On failure, returns false. + bool ReadUncompressedLength(uint32* result) { + assert(ip_ == NULL); // Must not have read anything yet + // Length is encoded in 1..5 bytes + *result = 0; + uint32 shift = 0; + while (true) { + if (shift >= 32) return false; + size_t n; + const char* ip = reader_->Peek(&n); + if (n == 0) return false; + const unsigned char c = *(reinterpret_cast<const unsigned char*>(ip)); + reader_->Skip(1); + uint32 val = c & 0x7f; + if (((val << shift) >> shift) != val) return false; + *result |= val << shift; + if (c < 128) { + break; + } + shift += 7; + } + return true; + } + + // Process the next item found in the input. + // Returns true if successful, false on error or end of input. + template <class Writer> + void DecompressAllTags(Writer* writer) { + const char* ip = ip_; + + // We could have put this refill fragment only at the beginning of the loop. + // However, duplicating it at the end of each branch gives the compiler more + // scope to optimize the <ip_limit_ - ip> expression based on the local + // context, which overall increases speed. + #define MAYBE_REFILL() \ + if (ip_limit_ - ip < kMaximumTagLength) { \ + ip_ = ip; \ + if (!RefillTag()) return; \ + ip = ip_; \ + } + + MAYBE_REFILL(); + for ( ;; ) { + const unsigned char c = *(reinterpret_cast<const unsigned char*>(ip++)); + + if ((c & 0x3) == LITERAL) { + size_t literal_length = (c >> 2) + 1u; + if (writer->TryFastAppend(ip, ip_limit_ - ip, literal_length)) { + assert(literal_length < 61); + ip += literal_length; + // NOTE(user): There is no MAYBE_REFILL() here, as TryFastAppend() + // will not return true unless there's already at least five spare + // bytes in addition to the literal. + continue; + } + if (PREDICT_FALSE(literal_length >= 61)) { + // Long literal. + const size_t literal_length_length = literal_length - 60; + literal_length = + (LittleEndian::Load32(ip) & wordmask[literal_length_length]) + 1; + ip += literal_length_length; + } + + size_t avail = ip_limit_ - ip; + while (avail < literal_length) { + if (!writer->Append(ip, avail)) return; + literal_length -= avail; + reader_->Skip(peeked_); + size_t n; + ip = reader_->Peek(&n); + avail = n; + peeked_ = avail; + if (avail == 0) return; // Premature end of input + ip_limit_ = ip + avail; + } + if (!writer->Append(ip, literal_length)) { + return; + } + ip += literal_length; + MAYBE_REFILL(); + } else { + const uint32 entry = char_table[c]; + const uint32 trailer = LittleEndian::Load32(ip) & wordmask[entry >> 11]; + const uint32 length = entry & 0xff; + ip += entry >> 11; + + // copy_offset/256 is encoded in bits 8..10. By just fetching + // those bits, we get copy_offset (since the bit-field starts at + // bit 8). + const uint32 copy_offset = entry & 0x700; + if (!writer->AppendFromSelf(copy_offset + trailer, length)) { + return; + } + MAYBE_REFILL(); + } + } + +#undef MAYBE_REFILL + } +}; + +bool SnappyDecompressor::RefillTag() { + const char* ip = ip_; + if (ip == ip_limit_) { + // Fetch a new fragment from the reader + reader_->Skip(peeked_); // All peeked bytes are used up + size_t n; + ip = reader_->Peek(&n); + peeked_ = n; + if (n == 0) { + eof_ = true; + return false; + } + ip_limit_ = ip + n; + } + + // Read the tag character + assert(ip < ip_limit_); + const unsigned char c = *(reinterpret_cast<const unsigned char*>(ip)); + const uint32 entry = char_table[c]; + const uint32 needed = (entry >> 11) + 1; // +1 byte for 'c' + assert(needed <= sizeof(scratch_)); + + // Read more bytes from reader if needed + uint32 nbuf = ip_limit_ - ip; + if (nbuf < needed) { + // Stitch together bytes from ip and reader to form the word + // contents. We store the needed bytes in "scratch_". They + // will be consumed immediately by the caller since we do not + // read more than we need. + memmove(scratch_, ip, nbuf); + reader_->Skip(peeked_); // All peeked bytes are used up + peeked_ = 0; + while (nbuf < needed) { + size_t length; + const char* src = reader_->Peek(&length); + if (length == 0) return false; + uint32 to_add = min<uint32>(needed - nbuf, length); + memcpy(scratch_ + nbuf, src, to_add); + nbuf += to_add; + reader_->Skip(to_add); + } + assert(nbuf == needed); + ip_ = scratch_; + ip_limit_ = scratch_ + needed; + } else if (nbuf < kMaximumTagLength) { + // Have enough bytes, but move into scratch_ so that we do not + // read past end of input + memmove(scratch_, ip, nbuf); + reader_->Skip(peeked_); // All peeked bytes are used up + peeked_ = 0; + ip_ = scratch_; + ip_limit_ = scratch_ + nbuf; + } else { + // Pass pointer to buffer returned by reader_. + ip_ = ip; + } + return true; +} + +template <typename Writer> +static bool InternalUncompress(Source* r, Writer* writer) { + // Read the uncompressed length from the front of the compressed input + SnappyDecompressor decompressor(r); + uint32 uncompressed_len = 0; + if (!decompressor.ReadUncompressedLength(&uncompressed_len)) return false; + return InternalUncompressAllTags(&decompressor, writer, uncompressed_len); +} + +template <typename Writer> +static bool InternalUncompressAllTags(SnappyDecompressor* decompressor, + Writer* writer, + uint32 uncompressed_len) { + writer->SetExpectedLength(uncompressed_len); + + // Process the entire input + decompressor->DecompressAllTags(writer); + writer->Flush(); + return (decompressor->eof() && writer->CheckLength()); +} + +bool GetUncompressedLength(Source* source, uint32* result) { + SnappyDecompressor decompressor(source); + return decompressor.ReadUncompressedLength(result); +} + +size_t Compress(Source* reader, Sink* writer) { + size_t written = 0; + size_t N = reader->Available(); + char ulength[Varint::kMax32]; + char* p = Varint::Encode32(ulength, N); + writer->Append(ulength, p-ulength); + written += (p - ulength); + + internal::WorkingMemory wmem; + char* scratch = NULL; + char* scratch_output = NULL; + + while (N > 0) { + // Get next block to compress (without copying if possible) + size_t fragment_size; + const char* fragment = reader->Peek(&fragment_size); + assert(fragment_size != 0); // premature end of input + const size_t num_to_read = min(N, kBlockSize); + size_t bytes_read = fragment_size; + + size_t pending_advance = 0; + if (bytes_read >= num_to_read) { + // Buffer returned by reader is large enough + pending_advance = num_to_read; + fragment_size = num_to_read; + } else { + // Read into scratch buffer + if (scratch == NULL) { + // If this is the last iteration, we want to allocate N bytes + // of space, otherwise the max possible kBlockSize space. + // num_to_read contains exactly the correct value + scratch = new char[num_to_read]; + } + memcpy(scratch, fragment, bytes_read); + reader->Skip(bytes_read); + + while (bytes_read < num_to_read) { + fragment = reader->Peek(&fragment_size); + size_t n = min<size_t>(fragment_size, num_to_read - bytes_read); + memcpy(scratch + bytes_read, fragment, n); + bytes_read += n; + reader->Skip(n); + } + assert(bytes_read == num_to_read); + fragment = scratch; + fragment_size = num_to_read; + } + assert(fragment_size == num_to_read); + + // Get encoding table for compression + int table_size; + uint16* table = wmem.GetHashTable(num_to_read, &table_size); + + // Compress input_fragment and append to dest + const int max_output = MaxCompressedLength(num_to_read); + + // Need a scratch buffer for the output, in case the byte sink doesn't + // have room for us directly. + if (scratch_output == NULL) { + scratch_output = new char[max_output]; + } else { + // Since we encode kBlockSize regions followed by a region + // which is <= kBlockSize in length, a previously allocated + // scratch_output[] region is big enough for this iteration. + } + char* dest = writer->GetAppendBuffer(max_output, scratch_output); + char* end = internal::CompressFragment(fragment, fragment_size, + dest, table, table_size); + writer->Append(dest, end - dest); + written += (end - dest); + + N -= num_to_read; + reader->Skip(pending_advance); + } + + delete[] scratch; + delete[] scratch_output; + + return written; +} + +// ----------------------------------------------------------------------- +// IOVec interfaces +// ----------------------------------------------------------------------- + +// A type that writes to an iovec. +// Note that this is not a "ByteSink", but a type that matches the +// Writer template argument to SnappyDecompressor::DecompressAllTags(). +class SnappyIOVecWriter { + private: + const struct iovec* output_iov_; + const size_t output_iov_count_; + + // We are currently writing into output_iov_[curr_iov_index_]. + size_t curr_iov_index_; + + // Bytes written to output_iov_[curr_iov_index_] so far. + size_t curr_iov_written_; + + // Total bytes decompressed into output_iov_ so far. + size_t total_written_; + + // Maximum number of bytes that will be decompressed into output_iov_. + size_t output_limit_; + + inline char* GetIOVecPointer(size_t index, size_t offset) { + return reinterpret_cast<char*>(output_iov_[index].iov_base) + + offset; + } + + public: + // Does not take ownership of iov. iov must be valid during the + // entire lifetime of the SnappyIOVecWriter. + inline SnappyIOVecWriter(const struct iovec* iov, size_t iov_count) + : output_iov_(iov), + output_iov_count_(iov_count), + curr_iov_index_(0), + curr_iov_written_(0), + total_written_(0), + output_limit_(-1) { + } + + inline void SetExpectedLength(size_t len) { + output_limit_ = len; + } + + inline bool CheckLength() const { + return total_written_ == output_limit_; + } + + inline bool Append(const char* ip, size_t len) { + if (total_written_ + len > output_limit_) { + return false; + } + + while (len > 0) { + assert(curr_iov_written_ <= output_iov_[curr_iov_index_].iov_len); + if (curr_iov_written_ >= output_iov_[curr_iov_index_].iov_len) { + // This iovec is full. Go to the next one. + if (curr_iov_index_ + 1 >= output_iov_count_) { + return false; + } + curr_iov_written_ = 0; + ++curr_iov_index_; + } + + const size_t to_write = std::min( + len, output_iov_[curr_iov_index_].iov_len - curr_iov_written_); + memcpy(GetIOVecPointer(curr_iov_index_, curr_iov_written_), + ip, + to_write); + curr_iov_written_ += to_write; + total_written_ += to_write; + ip += to_write; + len -= to_write; + } + + return true; + } + + inline bool TryFastAppend(const char* ip, size_t available, size_t len) { + const size_t space_left = output_limit_ - total_written_; + if (len <= 16 && available >= 16 + kMaximumTagLength && space_left >= 16 && + output_iov_[curr_iov_index_].iov_len - curr_iov_written_ >= 16) { + // Fast path, used for the majority (about 95%) of invocations. + char* ptr = GetIOVecPointer(curr_iov_index_, curr_iov_written_); + UnalignedCopy64(ip, ptr); + UnalignedCopy64(ip + 8, ptr + 8); + curr_iov_written_ += len; + total_written_ += len; + return true; + } + + return false; + } + + inline bool AppendFromSelf(size_t offset, size_t len) { + if (offset > total_written_ || offset == 0) { + return false; + } + const size_t space_left = output_limit_ - total_written_; + if (len > space_left) { + return false; + } + + // Locate the iovec from which we need to start the copy. + size_t from_iov_index = curr_iov_index_; + size_t from_iov_offset = curr_iov_written_; + while (offset > 0) { + if (from_iov_offset >= offset) { + from_iov_offset -= offset; + break; + } + + offset -= from_iov_offset; + assert(from_iov_index > 0); + --from_iov_index; + from_iov_offset = output_iov_[from_iov_index].iov_len; + } + + // Copy <len> bytes starting from the iovec pointed to by from_iov_index to + // the current iovec. + while (len > 0) { + assert(from_iov_index <= curr_iov_index_); + if (from_iov_index != curr_iov_index_) { + const size_t to_copy = std::min( + output_iov_[from_iov_index].iov_len - from_iov_offset, + len); + Append(GetIOVecPointer(from_iov_index, from_iov_offset), to_copy); + len -= to_copy; + if (len > 0) { + ++from_iov_index; + from_iov_offset = 0; + } + } else { + assert(curr_iov_written_ <= output_iov_[curr_iov_index_].iov_len); + size_t to_copy = std::min(output_iov_[curr_iov_index_].iov_len - + curr_iov_written_, + len); + if (to_copy == 0) { + // This iovec is full. Go to the next one. + if (curr_iov_index_ + 1 >= output_iov_count_) { + return false; + } + ++curr_iov_index_; + curr_iov_written_ = 0; + continue; + } + if (to_copy > len) { + to_copy = len; + } + IncrementalCopy(GetIOVecPointer(from_iov_index, from_iov_offset), + GetIOVecPointer(curr_iov_index_, curr_iov_written_), + to_copy); + curr_iov_written_ += to_copy; + from_iov_offset += to_copy; + total_written_ += to_copy; + len -= to_copy; + } + } + + return true; + } + + inline void Flush() {} +}; + +bool RawUncompressToIOVec(const char* compressed, size_t compressed_length, + const struct iovec* iov, size_t iov_cnt) { + ByteArraySource reader(compressed, compressed_length); + return RawUncompressToIOVec(&reader, iov, iov_cnt); +} + +bool RawUncompressToIOVec(Source* compressed, const struct iovec* iov, + size_t iov_cnt) { + SnappyIOVecWriter output(iov, iov_cnt); + return InternalUncompress(compressed, &output); +} + +// ----------------------------------------------------------------------- +// Flat array interfaces +// ----------------------------------------------------------------------- + +// A type that writes to a flat array. +// Note that this is not a "ByteSink", but a type that matches the +// Writer template argument to SnappyDecompressor::DecompressAllTags(). +class SnappyArrayWriter { + private: + char* base_; + char* op_; + char* op_limit_; + + public: + inline explicit SnappyArrayWriter(char* dst) + : base_(dst), + op_(dst), + op_limit_(dst) { + } + + inline void SetExpectedLength(size_t len) { + op_limit_ = op_ + len; + } + + inline bool CheckLength() const { + return op_ == op_limit_; + } + + inline bool Append(const char* ip, size_t len) { + char* op = op_; + const size_t space_left = op_limit_ - op; + if (space_left < len) { + return false; + } + memcpy(op, ip, len); + op_ = op + len; + return true; + } + + inline bool TryFastAppend(const char* ip, size_t available, size_t len) { + char* op = op_; + const size_t space_left = op_limit_ - op; + if (len <= 16 && available >= 16 + kMaximumTagLength && space_left >= 16) { + // Fast path, used for the majority (about 95%) of invocations. + UnalignedCopy64(ip, op); + UnalignedCopy64(ip + 8, op + 8); + op_ = op + len; + return true; + } else { + return false; + } + } + + inline bool AppendFromSelf(size_t offset, size_t len) { + char* op = op_; + const size_t space_left = op_limit_ - op; + + // Check if we try to append from before the start of the buffer. + // Normally this would just be a check for "produced < offset", + // but "produced <= offset - 1u" is equivalent for every case + // except the one where offset==0, where the right side will wrap around + // to a very big number. This is convenient, as offset==0 is another + // invalid case that we also want to catch, so that we do not go + // into an infinite loop. + assert(op >= base_); + size_t produced = op - base_; + if (produced <= offset - 1u) { + return false; + } + if (len <= 16 && offset >= 8 && space_left >= 16) { + // Fast path, used for the majority (70-80%) of dynamic invocations. + UnalignedCopy64(op - offset, op); + UnalignedCopy64(op - offset + 8, op + 8); + } else { + if (space_left >= len + kMaxIncrementCopyOverflow) { + IncrementalCopyFastPath(op - offset, op, len); + } else { + if (space_left < len) { + return false; + } + IncrementalCopy(op - offset, op, len); + } + } + + op_ = op + len; + return true; + } + inline size_t Produced() const { + return op_ - base_; + } + inline void Flush() {} +}; + +bool RawUncompress(const char* compressed, size_t n, char* uncompressed) { + ByteArraySource reader(compressed, n); + return RawUncompress(&reader, uncompressed); +} + +bool RawUncompress(Source* compressed, char* uncompressed) { + SnappyArrayWriter output(uncompressed); + return InternalUncompress(compressed, &output); +} + +bool Uncompress(const char* compressed, size_t n, string* uncompressed) { + size_t ulength; + if (!GetUncompressedLength(compressed, n, &ulength)) { + return false; + } + // On 32-bit builds: max_size() < kuint32max. Check for that instead + // of crashing (e.g., consider externally specified compressed data). + if (ulength > uncompressed->max_size()) { + return false; + } + STLStringResizeUninitialized(uncompressed, ulength); + return RawUncompress(compressed, n, string_as_array(uncompressed)); +} + +// A Writer that drops everything on the floor and just does validation +class SnappyDecompressionValidator { + private: + size_t expected_; + size_t produced_; + + public: + inline SnappyDecompressionValidator() : expected_(0), produced_(0) { } + inline void SetExpectedLength(size_t len) { + expected_ = len; + } + inline bool CheckLength() const { + return expected_ == produced_; + } + inline bool Append(const char* ip, size_t len) { + produced_ += len; + return produced_ <= expected_; + } + inline bool TryFastAppend(const char* ip, size_t available, size_t length) { + return false; + } + inline bool AppendFromSelf(size_t offset, size_t len) { + // See SnappyArrayWriter::AppendFromSelf for an explanation of + // the "offset - 1u" trick. + if (produced_ <= offset - 1u) return false; + produced_ += len; + return produced_ <= expected_; + } + inline void Flush() {} +}; + +bool IsValidCompressedBuffer(const char* compressed, size_t n) { + ByteArraySource reader(compressed, n); + SnappyDecompressionValidator writer; + return InternalUncompress(&reader, &writer); +} + +bool IsValidCompressed(Source* compressed) { + SnappyDecompressionValidator writer; + return InternalUncompress(compressed, &writer); +} + +void RawCompress(const char* input, + size_t input_length, + char* compressed, + size_t* compressed_length) { + ByteArraySource reader(input, input_length); + UncheckedByteArraySink writer(compressed); + Compress(&reader, &writer); + + // Compute how many bytes were added + *compressed_length = (writer.CurrentDestination() - compressed); +} + +size_t Compress(const char* input, size_t input_length, string* compressed) { + // Pre-grow the buffer to the max length of the compressed output + compressed->resize(MaxCompressedLength(input_length)); + + size_t compressed_length; + RawCompress(input, input_length, string_as_array(compressed), + &compressed_length); + compressed->resize(compressed_length); + return compressed_length; +} + +// ----------------------------------------------------------------------- +// Sink interface +// ----------------------------------------------------------------------- + +// A type that decompresses into a Sink. The template parameter +// Allocator must export one method "char* Allocate(int size);", which +// allocates a buffer of "size" and appends that to the destination. +template <typename Allocator> +class SnappyScatteredWriter { + Allocator allocator_; + + // We need random access into the data generated so far. Therefore + // we keep track of all of the generated data as an array of blocks. + // All of the blocks except the last have length kBlockSize. + vector<char*> blocks_; + size_t expected_; + + // Total size of all fully generated blocks so far + size_t full_size_; + + // Pointer into current output block + char* op_base_; // Base of output block + char* op_ptr_; // Pointer to next unfilled byte in block + char* op_limit_; // Pointer just past block + + inline size_t Size() const { + return full_size_ + (op_ptr_ - op_base_); + } + + bool SlowAppend(const char* ip, size_t len); + bool SlowAppendFromSelf(size_t offset, size_t len); + + public: + inline explicit SnappyScatteredWriter(const Allocator& allocator) + : allocator_(allocator), + full_size_(0), + op_base_(NULL), + op_ptr_(NULL), + op_limit_(NULL) { + } + + inline void SetExpectedLength(size_t len) { + assert(blocks_.empty()); + expected_ = len; + } + + inline bool CheckLength() const { + return Size() == expected_; + } + + // Return the number of bytes actually uncompressed so far + inline size_t Produced() const { + return Size(); + } + + inline bool Append(const char* ip, size_t len) { + size_t avail = op_limit_ - op_ptr_; + if (len <= avail) { + // Fast path + memcpy(op_ptr_, ip, len); + op_ptr_ += len; + return true; + } else { + return SlowAppend(ip, len); + } + } + + inline bool TryFastAppend(const char* ip, size_t available, size_t length) { + char* op = op_ptr_; + const int space_left = op_limit_ - op; + if (length <= 16 && available >= 16 + kMaximumTagLength && + space_left >= 16) { + // Fast path, used for the majority (about 95%) of invocations. + UNALIGNED_STORE64(op, UNALIGNED_LOAD64(ip)); + UNALIGNED_STORE64(op + 8, UNALIGNED_LOAD64(ip + 8)); + op_ptr_ = op + length; + return true; + } else { + return false; + } + } + + inline bool AppendFromSelf(size_t offset, size_t len) { + // See SnappyArrayWriter::AppendFromSelf for an explanation of + // the "offset - 1u" trick. + if (offset - 1u < op_ptr_ - op_base_) { + const size_t space_left = op_limit_ - op_ptr_; + if (space_left >= len + kMaxIncrementCopyOverflow) { + // Fast path: src and dst in current block. + IncrementalCopyFastPath(op_ptr_ - offset, op_ptr_, len); + op_ptr_ += len; + return true; + } + } + return SlowAppendFromSelf(offset, len); + } + + // Called at the end of the decompress. We ask the allocator + // write all blocks to the sink. + inline void Flush() { allocator_.Flush(Produced()); } +}; + +template<typename Allocator> +bool SnappyScatteredWriter<Allocator>::SlowAppend(const char* ip, size_t len) { + size_t avail = op_limit_ - op_ptr_; + while (len > avail) { + // Completely fill this block + memcpy(op_ptr_, ip, avail); + op_ptr_ += avail; + assert(op_limit_ - op_ptr_ == 0); + full_size_ += (op_ptr_ - op_base_); + len -= avail; + ip += avail; + + // Bounds check + if (full_size_ + len > expected_) { + return false; + } + + // Make new block + size_t bsize = min<size_t>(kBlockSize, expected_ - full_size_); + op_base_ = allocator_.Allocate(bsize); + op_ptr_ = op_base_; + op_limit_ = op_base_ + bsize; + blocks_.push_back(op_base_); + avail = bsize; + } + + memcpy(op_ptr_, ip, len); + op_ptr_ += len; + return true; +} + +template<typename Allocator> +bool SnappyScatteredWriter<Allocator>::SlowAppendFromSelf(size_t offset, + size_t len) { + // Overflow check + // See SnappyArrayWriter::AppendFromSelf for an explanation of + // the "offset - 1u" trick. + const size_t cur = Size(); + if (offset - 1u >= cur) return false; + if (expected_ - cur < len) return false; + + // Currently we shouldn't ever hit this path because Compress() chops the + // input into blocks and does not create cross-block copies. However, it is + // nice if we do not rely on that, since we can get better compression if we + // allow cross-block copies and thus might want to change the compressor in + // the future. + size_t src = cur - offset; + while (len-- > 0) { + char c = blocks_[src >> kBlockLog][src & (kBlockSize-1)]; + Append(&c, 1); + src++; + } + return true; +} + +class SnappySinkAllocator { + public: + explicit SnappySinkAllocator(Sink* dest): dest_(dest) {} + ~SnappySinkAllocator() {} + + char* Allocate(int size) { + Datablock block(new char[size], size); + blocks_.push_back(block); + return block.data; + } + + // We flush only at the end, because the writer wants + // random access to the blocks and once we hand the + // block over to the sink, we can't access it anymore. + // Also we don't write more than has been actually written + // to the blocks. + void Flush(size_t size) { + size_t size_written = 0; + size_t block_size; + for (int i = 0; i < blocks_.size(); ++i) { + block_size = min<size_t>(blocks_[i].size, size - size_written); + dest_->AppendAndTakeOwnership(blocks_[i].data, block_size, + &SnappySinkAllocator::Deleter, NULL); + size_written += block_size; + } + blocks_.clear(); + } + + private: + struct Datablock { + char* data; + size_t size; + Datablock(char* p, size_t s) : data(p), size(s) {} + }; + + static void Deleter(void* arg, const char* bytes, size_t size) { + delete[] bytes; + } + + Sink* dest_; + vector<Datablock> blocks_; + + // Note: copying this object is allowed +}; + +size_t UncompressAsMuchAsPossible(Source* compressed, Sink* uncompressed) { + SnappySinkAllocator allocator(uncompressed); + SnappyScatteredWriter<SnappySinkAllocator> writer(allocator); + InternalUncompress(compressed, &writer); + return writer.Produced(); +} + +bool Uncompress(Source* compressed, Sink* uncompressed) { + // Read the uncompressed length from the front of the compressed input + SnappyDecompressor decompressor(compressed); + uint32 uncompressed_len = 0; + if (!decompressor.ReadUncompressedLength(&uncompressed_len)) { + return false; + } + + char c; + size_t allocated_size; + char* buf = uncompressed->GetAppendBufferVariable( + 1, uncompressed_len, &c, 1, &allocated_size); + + // If we can get a flat buffer, then use it, otherwise do block by block + // uncompression + if (allocated_size >= uncompressed_len) { + SnappyArrayWriter writer(buf); + bool result = InternalUncompressAllTags( + &decompressor, &writer, uncompressed_len); + uncompressed->Append(buf, writer.Produced()); + return result; + } else { + SnappySinkAllocator allocator(uncompressed); + SnappyScatteredWriter<SnappySinkAllocator> writer(allocator); + return InternalUncompressAllTags(&decompressor, &writer, uncompressed_len); + } +} + +} // end namespace snappy diff --git a/other-licenses/snappy/src/snappy.h b/other-licenses/snappy/src/snappy.h new file mode 100644 index 0000000000..4568db890d --- /dev/null +++ b/other-licenses/snappy/src/snappy.h @@ -0,0 +1,203 @@ +// Copyright 2005 and onwards Google Inc. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +// +// A light-weight compression algorithm. It is designed for speed of +// compression and decompression, rather than for the utmost in space +// savings. +// +// For getting better compression ratios when you are compressing data +// with long repeated sequences or compressing data that is similar to +// other data, while still compressing fast, you might look at first +// using BMDiff and then compressing the output of BMDiff with +// Snappy. + +#ifndef THIRD_PARTY_SNAPPY_SNAPPY_H__ +#define THIRD_PARTY_SNAPPY_SNAPPY_H__ + +#include <stddef.h> +#include <string> + +#include "snappy-stubs-public.h" + +namespace snappy { + class Source; + class Sink; + + // ------------------------------------------------------------------------ + // Generic compression/decompression routines. + // ------------------------------------------------------------------------ + + // Compress the bytes read from "*source" and append to "*sink". Return the + // number of bytes written. + size_t Compress(Source* source, Sink* sink); + + // Find the uncompressed length of the given stream, as given by the header. + // Note that the true length could deviate from this; the stream could e.g. + // be truncated. + // + // Also note that this leaves "*source" in a state that is unsuitable for + // further operations, such as RawUncompress(). You will need to rewind + // or recreate the source yourself before attempting any further calls. + bool GetUncompressedLength(Source* source, uint32* result); + + // ------------------------------------------------------------------------ + // Higher-level string based routines (should be sufficient for most users) + // ------------------------------------------------------------------------ + + // Sets "*output" to the compressed version of "input[0,input_length-1]". + // Original contents of *output are lost. + // + // REQUIRES: "input[]" is not an alias of "*output". + size_t Compress(const char* input, size_t input_length, string* output); + + // Decompresses "compressed[0,compressed_length-1]" to "*uncompressed". + // Original contents of "*uncompressed" are lost. + // + // REQUIRES: "compressed[]" is not an alias of "*uncompressed". + // + // returns false if the message is corrupted and could not be decompressed + bool Uncompress(const char* compressed, size_t compressed_length, + string* uncompressed); + + // Decompresses "compressed" to "*uncompressed". + // + // returns false if the message is corrupted and could not be decompressed + bool Uncompress(Source* compressed, Sink* uncompressed); + + // This routine uncompresses as much of the "compressed" as possible + // into sink. It returns the number of valid bytes added to sink + // (extra invalid bytes may have been added due to errors; the caller + // should ignore those). The emitted data typically has length + // GetUncompressedLength(), but may be shorter if an error is + // encountered. + size_t UncompressAsMuchAsPossible(Source* compressed, Sink* uncompressed); + + // ------------------------------------------------------------------------ + // Lower-level character array based routines. May be useful for + // efficiency reasons in certain circumstances. + // ------------------------------------------------------------------------ + + // REQUIRES: "compressed" must point to an area of memory that is at + // least "MaxCompressedLength(input_length)" bytes in length. + // + // Takes the data stored in "input[0..input_length]" and stores + // it in the array pointed to by "compressed". + // + // "*compressed_length" is set to the length of the compressed output. + // + // Example: + // char* output = new char[snappy::MaxCompressedLength(input_length)]; + // size_t output_length; + // RawCompress(input, input_length, output, &output_length); + // ... Process(output, output_length) ... + // delete [] output; + void RawCompress(const char* input, + size_t input_length, + char* compressed, + size_t* compressed_length); + + // Given data in "compressed[0..compressed_length-1]" generated by + // calling the Snappy::Compress routine, this routine + // stores the uncompressed data to + // uncompressed[0..GetUncompressedLength(compressed)-1] + // returns false if the message is corrupted and could not be decrypted + bool RawUncompress(const char* compressed, size_t compressed_length, + char* uncompressed); + + // Given data from the byte source 'compressed' generated by calling + // the Snappy::Compress routine, this routine stores the uncompressed + // data to + // uncompressed[0..GetUncompressedLength(compressed,compressed_length)-1] + // returns false if the message is corrupted and could not be decrypted + bool RawUncompress(Source* compressed, char* uncompressed); + + // Given data in "compressed[0..compressed_length-1]" generated by + // calling the Snappy::Compress routine, this routine + // stores the uncompressed data to the iovec "iov". The number of physical + // buffers in "iov" is given by iov_cnt and their cumulative size + // must be at least GetUncompressedLength(compressed). The individual buffers + // in "iov" must not overlap with each other. + // + // returns false if the message is corrupted and could not be decrypted + bool RawUncompressToIOVec(const char* compressed, size_t compressed_length, + const struct iovec* iov, size_t iov_cnt); + + // Given data from the byte source 'compressed' generated by calling + // the Snappy::Compress routine, this routine stores the uncompressed + // data to the iovec "iov". The number of physical + // buffers in "iov" is given by iov_cnt and their cumulative size + // must be at least GetUncompressedLength(compressed). The individual buffers + // in "iov" must not overlap with each other. + // + // returns false if the message is corrupted and could not be decrypted + bool RawUncompressToIOVec(Source* compressed, const struct iovec* iov, + size_t iov_cnt); + + // Returns the maximal size of the compressed representation of + // input data that is "source_bytes" bytes in length; + size_t MaxCompressedLength(size_t source_bytes); + + // REQUIRES: "compressed[]" was produced by RawCompress() or Compress() + // Returns true and stores the length of the uncompressed data in + // *result normally. Returns false on parsing error. + // This operation takes O(1) time. + bool GetUncompressedLength(const char* compressed, size_t compressed_length, + size_t* result); + + // Returns true iff the contents of "compressed[]" can be uncompressed + // successfully. Does not return the uncompressed data. Takes + // time proportional to compressed_length, but is usually at least + // a factor of four faster than actual decompression. + bool IsValidCompressedBuffer(const char* compressed, + size_t compressed_length); + + // Returns true iff the contents of "compressed" can be uncompressed + // successfully. Does not return the uncompressed data. Takes + // time proportional to *compressed length, but is usually at least + // a factor of four faster than actual decompression. + // On success, consumes all of *compressed. On failure, consumes an + // unspecified prefix of *compressed. + bool IsValidCompressed(Source* compressed); + + // The size of a compression block. Note that many parts of the compression + // code assumes that kBlockSize <= 65536; in particular, the hash table + // can only store 16-bit offsets, and EmitCopy() also assumes the offset + // is 65535 bytes or less. Note also that if you change this, it will + // affect the framing format (see framing_format.txt). + // + // Note that there might be older data around that is compressed with larger + // block sizes, so the decompression code should not rely on the + // non-existence of long backreferences. + static const int kBlockLog = 16; + static const size_t kBlockSize = 1 << kBlockLog; + + static const int kMaxHashTableBits = 14; + static const size_t kMaxHashTableSize = 1 << kMaxHashTableBits; +} // end namespace snappy + +#endif // THIRD_PARTY_SNAPPY_SNAPPY_H__ diff --git a/other-licenses/snappy/src/snappy_unittest.cc b/other-licenses/snappy/src/snappy_unittest.cc new file mode 100644 index 0000000000..65ac16aaa4 --- /dev/null +++ b/other-licenses/snappy/src/snappy_unittest.cc @@ -0,0 +1,1529 @@ +// Copyright 2005 and onwards Google Inc. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +#include <math.h> +#include <stdlib.h> + + +#include <algorithm> +#include <string> +#include <vector> + +#include "snappy.h" +#include "snappy-internal.h" +#include "snappy-test.h" +#include "snappy-sinksource.h" + +DEFINE_int32(start_len, -1, + "Starting prefix size for testing (-1: just full file contents)"); +DEFINE_int32(end_len, -1, + "Starting prefix size for testing (-1: just full file contents)"); +DEFINE_int32(bytes, 10485760, + "How many bytes to compress/uncompress per file for timing"); + +DEFINE_bool(zlib, false, + "Run zlib compression (http://www.zlib.net)"); +DEFINE_bool(lzo, false, + "Run LZO compression (http://www.oberhumer.com/opensource/lzo/)"); +DEFINE_bool(quicklz, false, + "Run quickLZ compression (http://www.quicklz.com/)"); +DEFINE_bool(liblzf, false, + "Run libLZF compression " + "(http://www.goof.com/pcg/marc/liblzf.html)"); +DEFINE_bool(fastlz, false, + "Run FastLZ compression (http://www.fastlz.org/"); +DEFINE_bool(snappy, true, "Run snappy compression"); + +DEFINE_bool(write_compressed, false, + "Write compressed versions of each file to <file>.comp"); +DEFINE_bool(write_uncompressed, false, + "Write uncompressed versions of each file to <file>.uncomp"); + +DEFINE_bool(snappy_dump_decompression_table, false, + "If true, we print the decompression table during tests."); + +namespace snappy { + + +#ifdef HAVE_FUNC_MMAP + +// To test against code that reads beyond its input, this class copies a +// string to a newly allocated group of pages, the last of which +// is made unreadable via mprotect. Note that we need to allocate the +// memory with mmap(), as POSIX allows mprotect() only on memory allocated +// with mmap(), and some malloc/posix_memalign implementations expect to +// be able to read previously allocated memory while doing heap allocations. +class DataEndingAtUnreadablePage { + public: + explicit DataEndingAtUnreadablePage(const string& s) { + const size_t page_size = getpagesize(); + const size_t size = s.size(); + // Round up space for string to a multiple of page_size. + size_t space_for_string = (size + page_size - 1) & ~(page_size - 1); + alloc_size_ = space_for_string + page_size; + mem_ = mmap(NULL, alloc_size_, + PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); + CHECK_NE(MAP_FAILED, mem_); + protected_page_ = reinterpret_cast<char*>(mem_) + space_for_string; + char* dst = protected_page_ - size; + memcpy(dst, s.data(), size); + data_ = dst; + size_ = size; + // Make guard page unreadable. + CHECK_EQ(0, mprotect(protected_page_, page_size, PROT_NONE)); + } + + ~DataEndingAtUnreadablePage() { + // Undo the mprotect. + CHECK_EQ(0, mprotect(protected_page_, getpagesize(), PROT_READ|PROT_WRITE)); + CHECK_EQ(0, munmap(mem_, alloc_size_)); + } + + const char* data() const { return data_; } + size_t size() const { return size_; } + + private: + size_t alloc_size_; + void* mem_; + char* protected_page_; + const char* data_; + size_t size_; +}; + +#else // HAVE_FUNC_MMAP + +// Fallback for systems without mmap. +typedef string DataEndingAtUnreadablePage; + +#endif + +enum CompressorType { + ZLIB, LZO, LIBLZF, QUICKLZ, FASTLZ, SNAPPY +}; + +const char* names[] = { + "ZLIB", "LZO", "LIBLZF", "QUICKLZ", "FASTLZ", "SNAPPY" +}; + +static size_t MinimumRequiredOutputSpace(size_t input_size, + CompressorType comp) { + switch (comp) { +#ifdef ZLIB_VERSION + case ZLIB: + return ZLib::MinCompressbufSize(input_size); +#endif // ZLIB_VERSION + +#ifdef LZO_VERSION + case LZO: + return input_size + input_size/64 + 16 + 3; +#endif // LZO_VERSION + +#ifdef LZF_VERSION + case LIBLZF: + return input_size; +#endif // LZF_VERSION + +#ifdef QLZ_VERSION_MAJOR + case QUICKLZ: + return input_size + 36000; // 36000 is used for scratch. +#endif // QLZ_VERSION_MAJOR + +#ifdef FASTLZ_VERSION + case FASTLZ: + return max(static_cast<int>(ceil(input_size * 1.05)), 66); +#endif // FASTLZ_VERSION + + case SNAPPY: + return snappy::MaxCompressedLength(input_size); + + default: + LOG(FATAL) << "Unknown compression type number " << comp; + return 0; + } +} + +// Returns true if we successfully compressed, false otherwise. +// +// If compressed_is_preallocated is set, do not resize the compressed buffer. +// This is typically what you want for a benchmark, in order to not spend +// time in the memory allocator. If you do set this flag, however, +// "compressed" must be preinitialized to at least MinCompressbufSize(comp) +// number of bytes, and may contain junk bytes at the end after return. +static bool Compress(const char* input, size_t input_size, CompressorType comp, + string* compressed, bool compressed_is_preallocated) { + if (!compressed_is_preallocated) { + compressed->resize(MinimumRequiredOutputSpace(input_size, comp)); + } + + switch (comp) { +#ifdef ZLIB_VERSION + case ZLIB: { + ZLib zlib; + uLongf destlen = compressed->size(); + int ret = zlib.Compress( + reinterpret_cast<Bytef*>(string_as_array(compressed)), + &destlen, + reinterpret_cast<const Bytef*>(input), + input_size); + CHECK_EQ(Z_OK, ret); + if (!compressed_is_preallocated) { + compressed->resize(destlen); + } + return true; + } +#endif // ZLIB_VERSION + +#ifdef LZO_VERSION + case LZO: { + unsigned char* mem = new unsigned char[LZO1X_1_15_MEM_COMPRESS]; + lzo_uint destlen; + int ret = lzo1x_1_15_compress( + reinterpret_cast<const uint8*>(input), + input_size, + reinterpret_cast<uint8*>(string_as_array(compressed)), + &destlen, + mem); + CHECK_EQ(LZO_E_OK, ret); + delete[] mem; + if (!compressed_is_preallocated) { + compressed->resize(destlen); + } + break; + } +#endif // LZO_VERSION + +#ifdef LZF_VERSION + case LIBLZF: { + int destlen = lzf_compress(input, + input_size, + string_as_array(compressed), + input_size); + if (destlen == 0) { + // lzf *can* cause lots of blowup when compressing, so they + // recommend to limit outsize to insize, and just not compress + // if it's bigger. Ideally, we'd just swap input and output. + compressed->assign(input, input_size); + destlen = input_size; + } + if (!compressed_is_preallocated) { + compressed->resize(destlen); + } + break; + } +#endif // LZF_VERSION + +#ifdef QLZ_VERSION_MAJOR + case QUICKLZ: { + qlz_state_compress *state_compress = new qlz_state_compress; + int destlen = qlz_compress(input, + string_as_array(compressed), + input_size, + state_compress); + delete state_compress; + CHECK_NE(0, destlen); + if (!compressed_is_preallocated) { + compressed->resize(destlen); + } + break; + } +#endif // QLZ_VERSION_MAJOR + +#ifdef FASTLZ_VERSION + case FASTLZ: { + // Use level 1 compression since we mostly care about speed. + int destlen = fastlz_compress_level( + 1, + input, + input_size, + string_as_array(compressed)); + if (!compressed_is_preallocated) { + compressed->resize(destlen); + } + CHECK_NE(destlen, 0); + break; + } +#endif // FASTLZ_VERSION + + case SNAPPY: { + size_t destlen; + snappy::RawCompress(input, input_size, + string_as_array(compressed), + &destlen); + CHECK_LE(destlen, snappy::MaxCompressedLength(input_size)); + if (!compressed_is_preallocated) { + compressed->resize(destlen); + } + break; + } + + default: { + return false; // the asked-for library wasn't compiled in + } + } + return true; +} + +static bool Uncompress(const string& compressed, CompressorType comp, + int size, string* output) { + switch (comp) { +#ifdef ZLIB_VERSION + case ZLIB: { + output->resize(size); + ZLib zlib; + uLongf destlen = output->size(); + int ret = zlib.Uncompress( + reinterpret_cast<Bytef*>(string_as_array(output)), + &destlen, + reinterpret_cast<const Bytef*>(compressed.data()), + compressed.size()); + CHECK_EQ(Z_OK, ret); + CHECK_EQ(static_cast<uLongf>(size), destlen); + break; + } +#endif // ZLIB_VERSION + +#ifdef LZO_VERSION + case LZO: { + output->resize(size); + lzo_uint destlen; + int ret = lzo1x_decompress( + reinterpret_cast<const uint8*>(compressed.data()), + compressed.size(), + reinterpret_cast<uint8*>(string_as_array(output)), + &destlen, + NULL); + CHECK_EQ(LZO_E_OK, ret); + CHECK_EQ(static_cast<lzo_uint>(size), destlen); + break; + } +#endif // LZO_VERSION + +#ifdef LZF_VERSION + case LIBLZF: { + output->resize(size); + int destlen = lzf_decompress(compressed.data(), + compressed.size(), + string_as_array(output), + output->size()); + if (destlen == 0) { + // This error probably means we had decided not to compress, + // and thus have stored input in output directly. + output->assign(compressed.data(), compressed.size()); + destlen = compressed.size(); + } + CHECK_EQ(destlen, size); + break; + } +#endif // LZF_VERSION + +#ifdef QLZ_VERSION_MAJOR + case QUICKLZ: { + output->resize(size); + qlz_state_decompress *state_decompress = new qlz_state_decompress; + int destlen = qlz_decompress(compressed.data(), + string_as_array(output), + state_decompress); + delete state_decompress; + CHECK_EQ(destlen, size); + break; + } +#endif // QLZ_VERSION_MAJOR + +#ifdef FASTLZ_VERSION + case FASTLZ: { + output->resize(size); + int destlen = fastlz_decompress(compressed.data(), + compressed.length(), + string_as_array(output), + size); + CHECK_EQ(destlen, size); + break; + } +#endif // FASTLZ_VERSION + + case SNAPPY: { + snappy::RawUncompress(compressed.data(), compressed.size(), + string_as_array(output)); + break; + } + + default: { + return false; // the asked-for library wasn't compiled in + } + } + return true; +} + +static void Measure(const char* data, + size_t length, + CompressorType comp, + int repeats, + int block_size) { + // Run tests a few time and pick median running times + static const int kRuns = 5; + double ctime[kRuns]; + double utime[kRuns]; + int compressed_size = 0; + + { + // Chop the input into blocks + int num_blocks = (length + block_size - 1) / block_size; + vector<const char*> input(num_blocks); + vector<size_t> input_length(num_blocks); + vector<string> compressed(num_blocks); + vector<string> output(num_blocks); + for (int b = 0; b < num_blocks; b++) { + int input_start = b * block_size; + int input_limit = min<int>((b+1)*block_size, length); + input[b] = data+input_start; + input_length[b] = input_limit-input_start; + + // Pre-grow the output buffer so we don't measure string append time. + compressed[b].resize(MinimumRequiredOutputSpace(block_size, comp)); + } + + // First, try one trial compression to make sure the code is compiled in + if (!Compress(input[0], input_length[0], comp, &compressed[0], true)) { + LOG(WARNING) << "Skipping " << names[comp] << ": " + << "library not compiled in"; + return; + } + + for (int run = 0; run < kRuns; run++) { + CycleTimer ctimer, utimer; + + for (int b = 0; b < num_blocks; b++) { + // Pre-grow the output buffer so we don't measure string append time. + compressed[b].resize(MinimumRequiredOutputSpace(block_size, comp)); + } + + ctimer.Start(); + for (int b = 0; b < num_blocks; b++) + for (int i = 0; i < repeats; i++) + Compress(input[b], input_length[b], comp, &compressed[b], true); + ctimer.Stop(); + + // Compress once more, with resizing, so we don't leave junk + // at the end that will confuse the decompressor. + for (int b = 0; b < num_blocks; b++) { + Compress(input[b], input_length[b], comp, &compressed[b], false); + } + + for (int b = 0; b < num_blocks; b++) { + output[b].resize(input_length[b]); + } + + utimer.Start(); + for (int i = 0; i < repeats; i++) + for (int b = 0; b < num_blocks; b++) + Uncompress(compressed[b], comp, input_length[b], &output[b]); + utimer.Stop(); + + ctime[run] = ctimer.Get(); + utime[run] = utimer.Get(); + } + + compressed_size = 0; + for (size_t i = 0; i < compressed.size(); i++) { + compressed_size += compressed[i].size(); + } + } + + sort(ctime, ctime + kRuns); + sort(utime, utime + kRuns); + const int med = kRuns/2; + + float comp_rate = (length / ctime[med]) * repeats / 1048576.0; + float uncomp_rate = (length / utime[med]) * repeats / 1048576.0; + string x = names[comp]; + x += ":"; + string urate = (uncomp_rate >= 0) + ? StringPrintf("%.1f", uncomp_rate) + : string("?"); + printf("%-7s [b %dM] bytes %6d -> %6d %4.1f%% " + "comp %5.1f MB/s uncomp %5s MB/s\n", + x.c_str(), + block_size/(1<<20), + static_cast<int>(length), static_cast<uint32>(compressed_size), + (compressed_size * 100.0) / max<int>(1, length), + comp_rate, + urate.c_str()); +} + +static int VerifyString(const string& input) { + string compressed; + DataEndingAtUnreadablePage i(input); + const size_t written = snappy::Compress(i.data(), i.size(), &compressed); + CHECK_EQ(written, compressed.size()); + CHECK_LE(compressed.size(), + snappy::MaxCompressedLength(input.size())); + CHECK(snappy::IsValidCompressedBuffer(compressed.data(), compressed.size())); + + string uncompressed; + DataEndingAtUnreadablePage c(compressed); + CHECK(snappy::Uncompress(c.data(), c.size(), &uncompressed)); + CHECK_EQ(uncompressed, input); + return uncompressed.size(); +} + +static void VerifyStringSink(const string& input) { + string compressed; + DataEndingAtUnreadablePage i(input); + const size_t written = snappy::Compress(i.data(), i.size(), &compressed); + CHECK_EQ(written, compressed.size()); + CHECK_LE(compressed.size(), + snappy::MaxCompressedLength(input.size())); + CHECK(snappy::IsValidCompressedBuffer(compressed.data(), compressed.size())); + + string uncompressed; + uncompressed.resize(input.size()); + snappy::UncheckedByteArraySink sink(string_as_array(&uncompressed)); + DataEndingAtUnreadablePage c(compressed); + snappy::ByteArraySource source(c.data(), c.size()); + CHECK(snappy::Uncompress(&source, &sink)); + CHECK_EQ(uncompressed, input); +} + +static void VerifyIOVec(const string& input) { + string compressed; + DataEndingAtUnreadablePage i(input); + const size_t written = snappy::Compress(i.data(), i.size(), &compressed); + CHECK_EQ(written, compressed.size()); + CHECK_LE(compressed.size(), + snappy::MaxCompressedLength(input.size())); + CHECK(snappy::IsValidCompressedBuffer(compressed.data(), compressed.size())); + + // Try uncompressing into an iovec containing a random number of entries + // ranging from 1 to 10. + char* buf = new char[input.size()]; + ACMRandom rnd(input.size()); + size_t num = rnd.Next() % 10 + 1; + if (input.size() < num) { + num = input.size(); + } + struct iovec* iov = new iovec[num]; + int used_so_far = 0; + for (size_t i = 0; i < num; ++i) { + iov[i].iov_base = buf + used_so_far; + if (i == num - 1) { + iov[i].iov_len = input.size() - used_so_far; + } else { + // Randomly choose to insert a 0 byte entry. + if (rnd.OneIn(5)) { + iov[i].iov_len = 0; + } else { + iov[i].iov_len = rnd.Uniform(input.size()); + } + } + used_so_far += iov[i].iov_len; + } + CHECK(snappy::RawUncompressToIOVec( + compressed.data(), compressed.size(), iov, num)); + CHECK(!memcmp(buf, input.data(), input.size())); + delete[] iov; + delete[] buf; +} + +// Test that data compressed by a compressor that does not +// obey block sizes is uncompressed properly. +static void VerifyNonBlockedCompression(const string& input) { + if (input.length() > snappy::kBlockSize) { + // We cannot test larger blocks than the maximum block size, obviously. + return; + } + + string prefix; + Varint::Append32(&prefix, input.size()); + + // Setup compression table + snappy::internal::WorkingMemory wmem; + int table_size; + uint16* table = wmem.GetHashTable(input.size(), &table_size); + + // Compress entire input in one shot + string compressed; + compressed += prefix; + compressed.resize(prefix.size()+snappy::MaxCompressedLength(input.size())); + char* dest = string_as_array(&compressed) + prefix.size(); + char* end = snappy::internal::CompressFragment(input.data(), input.size(), + dest, table, table_size); + compressed.resize(end - compressed.data()); + + // Uncompress into string + string uncomp_str; + CHECK(snappy::Uncompress(compressed.data(), compressed.size(), &uncomp_str)); + CHECK_EQ(uncomp_str, input); + + // Uncompress using source/sink + string uncomp_str2; + uncomp_str2.resize(input.size()); + snappy::UncheckedByteArraySink sink(string_as_array(&uncomp_str2)); + snappy::ByteArraySource source(compressed.data(), compressed.size()); + CHECK(snappy::Uncompress(&source, &sink)); + CHECK_EQ(uncomp_str2, input); + + // Uncompress into iovec + { + static const int kNumBlocks = 10; + struct iovec vec[kNumBlocks]; + const int block_size = 1 + input.size() / kNumBlocks; + string iovec_data(block_size * kNumBlocks, 'x'); + for (int i = 0; i < kNumBlocks; i++) { + vec[i].iov_base = string_as_array(&iovec_data) + i * block_size; + vec[i].iov_len = block_size; + } + CHECK(snappy::RawUncompressToIOVec(compressed.data(), compressed.size(), + vec, kNumBlocks)); + CHECK_EQ(string(iovec_data.data(), input.size()), input); + } +} + +// Expand the input so that it is at least K times as big as block size +static string Expand(const string& input) { + static const int K = 3; + string data = input; + while (data.size() < K * snappy::kBlockSize) { + data += input; + } + return data; +} + +static int Verify(const string& input) { + VLOG(1) << "Verifying input of size " << input.size(); + + // Compress using string based routines + const int result = VerifyString(input); + + // Verify using sink based routines + VerifyStringSink(input); + + VerifyNonBlockedCompression(input); + VerifyIOVec(input); + if (!input.empty()) { + const string expanded = Expand(input); + VerifyNonBlockedCompression(expanded); + VerifyIOVec(input); + } + + return result; +} + + +static bool IsValidCompressedBuffer(const string& c) { + return snappy::IsValidCompressedBuffer(c.data(), c.size()); +} +static bool Uncompress(const string& c, string* u) { + return snappy::Uncompress(c.data(), c.size(), u); +} + +// This test checks to ensure that snappy doesn't coredump if it gets +// corrupted data. +TEST(CorruptedTest, VerifyCorrupted) { + string source = "making sure we don't crash with corrupted input"; + VLOG(1) << source; + string dest; + string uncmp; + snappy::Compress(source.data(), source.size(), &dest); + + // Mess around with the data. It's hard to simulate all possible + // corruptions; this is just one example ... + CHECK_GT(dest.size(), 3); + dest[1]--; + dest[3]++; + // this really ought to fail. + CHECK(!IsValidCompressedBuffer(dest)); + CHECK(!Uncompress(dest, &uncmp)); + + // This is testing for a security bug - a buffer that decompresses to 100k + // but we lie in the snappy header and only reserve 0 bytes of memory :) + source.resize(100000); + for (size_t i = 0; i < source.length(); ++i) { + source[i] = 'A'; + } + snappy::Compress(source.data(), source.size(), &dest); + dest[0] = dest[1] = dest[2] = dest[3] = 0; + CHECK(!IsValidCompressedBuffer(dest)); + CHECK(!Uncompress(dest, &uncmp)); + + if (sizeof(void *) == 4) { + // Another security check; check a crazy big length can't DoS us with an + // over-allocation. + // Currently this is done only for 32-bit builds. On 64-bit builds, + // where 3 GB might be an acceptable allocation size, Uncompress() + // attempts to decompress, and sometimes causes the test to run out of + // memory. + dest[0] = dest[1] = dest[2] = dest[3] = '\xff'; + // This decodes to a really large size, i.e., about 3 GB. + dest[4] = 'k'; + CHECK(!IsValidCompressedBuffer(dest)); + CHECK(!Uncompress(dest, &uncmp)); + } else { + LOG(WARNING) << "Crazy decompression lengths not checked on 64-bit build"; + } + + // This decodes to about 2 MB; much smaller, but should still fail. + dest[0] = dest[1] = dest[2] = '\xff'; + dest[3] = 0x00; + CHECK(!IsValidCompressedBuffer(dest)); + CHECK(!Uncompress(dest, &uncmp)); + + // try reading stuff in from a bad file. + for (int i = 1; i <= 3; ++i) { + string data = ReadTestDataFile(StringPrintf("baddata%d.snappy", i).c_str(), + 0); + string uncmp; + // check that we don't return a crazy length + size_t ulen; + CHECK(!snappy::GetUncompressedLength(data.data(), data.size(), &ulen) + || (ulen < (1<<20))); + uint32 ulen2; + snappy::ByteArraySource source(data.data(), data.size()); + CHECK(!snappy::GetUncompressedLength(&source, &ulen2) || + (ulen2 < (1<<20))); + CHECK(!IsValidCompressedBuffer(data)); + CHECK(!Uncompress(data, &uncmp)); + } +} + +// Helper routines to construct arbitrary compressed strings. +// These mirror the compression code in snappy.cc, but are copied +// here so that we can bypass some limitations in the how snappy.cc +// invokes these routines. +static void AppendLiteral(string* dst, const string& literal) { + if (literal.empty()) return; + int n = literal.size() - 1; + if (n < 60) { + // Fit length in tag byte + dst->push_back(0 | (n << 2)); + } else { + // Encode in upcoming bytes + char number[4]; + int count = 0; + while (n > 0) { + number[count++] = n & 0xff; + n >>= 8; + } + dst->push_back(0 | ((59+count) << 2)); + *dst += string(number, count); + } + *dst += literal; +} + +static void AppendCopy(string* dst, int offset, int length) { + while (length > 0) { + // Figure out how much to copy in one shot + int to_copy; + if (length >= 68) { + to_copy = 64; + } else if (length > 64) { + to_copy = 60; + } else { + to_copy = length; + } + length -= to_copy; + + if ((to_copy >= 4) && (to_copy < 12) && (offset < 2048)) { + assert(to_copy-4 < 8); // Must fit in 3 bits + dst->push_back(1 | ((to_copy-4) << 2) | ((offset >> 8) << 5)); + dst->push_back(offset & 0xff); + } else if (offset < 65536) { + dst->push_back(2 | ((to_copy-1) << 2)); + dst->push_back(offset & 0xff); + dst->push_back(offset >> 8); + } else { + dst->push_back(3 | ((to_copy-1) << 2)); + dst->push_back(offset & 0xff); + dst->push_back((offset >> 8) & 0xff); + dst->push_back((offset >> 16) & 0xff); + dst->push_back((offset >> 24) & 0xff); + } + } +} + +TEST(Snappy, SimpleTests) { + Verify(""); + Verify("a"); + Verify("ab"); + Verify("abc"); + + Verify("aaaaaaa" + string(16, 'b') + string("aaaaa") + "abc"); + Verify("aaaaaaa" + string(256, 'b') + string("aaaaa") + "abc"); + Verify("aaaaaaa" + string(2047, 'b') + string("aaaaa") + "abc"); + Verify("aaaaaaa" + string(65536, 'b') + string("aaaaa") + "abc"); + Verify("abcaaaaaaa" + string(65536, 'b') + string("aaaaa") + "abc"); +} + +// Verify max blowup (lots of four-byte copies) +TEST(Snappy, MaxBlowup) { + string input; + for (int i = 0; i < 20000; i++) { + ACMRandom rnd(i); + uint32 bytes = static_cast<uint32>(rnd.Next()); + input.append(reinterpret_cast<char*>(&bytes), sizeof(bytes)); + } + for (int i = 19999; i >= 0; i--) { + ACMRandom rnd(i); + uint32 bytes = static_cast<uint32>(rnd.Next()); + input.append(reinterpret_cast<char*>(&bytes), sizeof(bytes)); + } + Verify(input); +} + +TEST(Snappy, RandomData) { + ACMRandom rnd(FLAGS_test_random_seed); + + const int num_ops = 20000; + for (int i = 0; i < num_ops; i++) { + if ((i % 1000) == 0) { + VLOG(0) << "Random op " << i << " of " << num_ops; + } + + string x; + size_t len = rnd.Uniform(4096); + if (i < 100) { + len = 65536 + rnd.Uniform(65536); + } + while (x.size() < len) { + int run_len = 1; + if (rnd.OneIn(10)) { + run_len = rnd.Skewed(8); + } + char c = (i < 100) ? rnd.Uniform(256) : rnd.Skewed(3); + while (run_len-- > 0 && x.size() < len) { + x += c; + } + } + + Verify(x); + } +} + +TEST(Snappy, FourByteOffset) { + // The new compressor cannot generate four-byte offsets since + // it chops up the input into 32KB pieces. So we hand-emit the + // copy manually. + + // The two fragments that make up the input string. + string fragment1 = "012345689abcdefghijklmnopqrstuvwxyz"; + string fragment2 = "some other string"; + + // How many times each fragment is emitted. + const int n1 = 2; + const int n2 = 100000 / fragment2.size(); + const int length = n1 * fragment1.size() + n2 * fragment2.size(); + + string compressed; + Varint::Append32(&compressed, length); + + AppendLiteral(&compressed, fragment1); + string src = fragment1; + for (int i = 0; i < n2; i++) { + AppendLiteral(&compressed, fragment2); + src += fragment2; + } + AppendCopy(&compressed, src.size(), fragment1.size()); + src += fragment1; + CHECK_EQ(length, src.size()); + + string uncompressed; + CHECK(snappy::IsValidCompressedBuffer(compressed.data(), compressed.size())); + CHECK(snappy::Uncompress(compressed.data(), compressed.size(), + &uncompressed)); + CHECK_EQ(uncompressed, src); +} + +TEST(Snappy, IOVecEdgeCases) { + // Test some tricky edge cases in the iovec output that are not necessarily + // exercised by random tests. + + // Our output blocks look like this initially (the last iovec is bigger + // than depicted): + // [ ] [ ] [ ] [ ] [ ] + static const int kLengths[] = { 2, 1, 4, 8, 128 }; + + struct iovec iov[ARRAYSIZE(kLengths)]; + for (int i = 0; i < ARRAYSIZE(kLengths); ++i) { + iov[i].iov_base = new char[kLengths[i]]; + iov[i].iov_len = kLengths[i]; + } + + string compressed; + Varint::Append32(&compressed, 22); + + // A literal whose output crosses three blocks. + // [ab] [c] [123 ] [ ] [ ] + AppendLiteral(&compressed, "abc123"); + + // A copy whose output crosses two blocks (source and destination + // segments marked). + // [ab] [c] [1231] [23 ] [ ] + // ^--^ -- + AppendCopy(&compressed, 3, 3); + + // A copy where the input is, at first, in the block before the output: + // + // [ab] [c] [1231] [231231 ] [ ] + // ^--- ^--- + // Then during the copy, the pointers move such that the input and + // output pointers are in the same block: + // + // [ab] [c] [1231] [23123123] [ ] + // ^- ^- + // And then they move again, so that the output pointer is no longer + // in the same block as the input pointer: + // [ab] [c] [1231] [23123123] [123 ] + // ^-- ^-- + AppendCopy(&compressed, 6, 9); + + // Finally, a copy where the input is from several blocks back, + // and it also crosses three blocks: + // + // [ab] [c] [1231] [23123123] [123b ] + // ^ ^ + // [ab] [c] [1231] [23123123] [123bc ] + // ^ ^ + // [ab] [c] [1231] [23123123] [123bc12 ] + // ^- ^- + AppendCopy(&compressed, 17, 4); + + CHECK(snappy::RawUncompressToIOVec( + compressed.data(), compressed.size(), iov, ARRAYSIZE(iov))); + CHECK_EQ(0, memcmp(iov[0].iov_base, "ab", 2)); + CHECK_EQ(0, memcmp(iov[1].iov_base, "c", 1)); + CHECK_EQ(0, memcmp(iov[2].iov_base, "1231", 4)); + CHECK_EQ(0, memcmp(iov[3].iov_base, "23123123", 8)); + CHECK_EQ(0, memcmp(iov[4].iov_base, "123bc12", 7)); + + for (int i = 0; i < ARRAYSIZE(kLengths); ++i) { + delete[] reinterpret_cast<char *>(iov[i].iov_base); + } +} + +TEST(Snappy, IOVecLiteralOverflow) { + static const int kLengths[] = { 3, 4 }; + + struct iovec iov[ARRAYSIZE(kLengths)]; + for (int i = 0; i < ARRAYSIZE(kLengths); ++i) { + iov[i].iov_base = new char[kLengths[i]]; + iov[i].iov_len = kLengths[i]; + } + + string compressed; + Varint::Append32(&compressed, 8); + + AppendLiteral(&compressed, "12345678"); + + CHECK(!snappy::RawUncompressToIOVec( + compressed.data(), compressed.size(), iov, ARRAYSIZE(iov))); + + for (int i = 0; i < ARRAYSIZE(kLengths); ++i) { + delete[] reinterpret_cast<char *>(iov[i].iov_base); + } +} + +TEST(Snappy, IOVecCopyOverflow) { + static const int kLengths[] = { 3, 4 }; + + struct iovec iov[ARRAYSIZE(kLengths)]; + for (int i = 0; i < ARRAYSIZE(kLengths); ++i) { + iov[i].iov_base = new char[kLengths[i]]; + iov[i].iov_len = kLengths[i]; + } + + string compressed; + Varint::Append32(&compressed, 8); + + AppendLiteral(&compressed, "123"); + AppendCopy(&compressed, 3, 5); + + CHECK(!snappy::RawUncompressToIOVec( + compressed.data(), compressed.size(), iov, ARRAYSIZE(iov))); + + for (int i = 0; i < ARRAYSIZE(kLengths); ++i) { + delete[] reinterpret_cast<char *>(iov[i].iov_base); + } +} + +static bool CheckUncompressedLength(const string& compressed, + size_t* ulength) { + const bool result1 = snappy::GetUncompressedLength(compressed.data(), + compressed.size(), + ulength); + + snappy::ByteArraySource source(compressed.data(), compressed.size()); + uint32 length; + const bool result2 = snappy::GetUncompressedLength(&source, &length); + CHECK_EQ(result1, result2); + return result1; +} + +TEST(SnappyCorruption, TruncatedVarint) { + string compressed, uncompressed; + size_t ulength; + compressed.push_back('\xf0'); + CHECK(!CheckUncompressedLength(compressed, &ulength)); + CHECK(!snappy::IsValidCompressedBuffer(compressed.data(), compressed.size())); + CHECK(!snappy::Uncompress(compressed.data(), compressed.size(), + &uncompressed)); +} + +TEST(SnappyCorruption, UnterminatedVarint) { + string compressed, uncompressed; + size_t ulength; + compressed.push_back('\x80'); + compressed.push_back('\x80'); + compressed.push_back('\x80'); + compressed.push_back('\x80'); + compressed.push_back('\x80'); + compressed.push_back(10); + CHECK(!CheckUncompressedLength(compressed, &ulength)); + CHECK(!snappy::IsValidCompressedBuffer(compressed.data(), compressed.size())); + CHECK(!snappy::Uncompress(compressed.data(), compressed.size(), + &uncompressed)); +} + +TEST(SnappyCorruption, OverflowingVarint) { + string compressed, uncompressed; + size_t ulength; + compressed.push_back('\xfb'); + compressed.push_back('\xff'); + compressed.push_back('\xff'); + compressed.push_back('\xff'); + compressed.push_back('\x7f'); + CHECK(!CheckUncompressedLength(compressed, &ulength)); + CHECK(!snappy::IsValidCompressedBuffer(compressed.data(), compressed.size())); + CHECK(!snappy::Uncompress(compressed.data(), compressed.size(), + &uncompressed)); +} + +TEST(Snappy, ReadPastEndOfBuffer) { + // Check that we do not read past end of input + + // Make a compressed string that ends with a single-byte literal + string compressed; + Varint::Append32(&compressed, 1); + AppendLiteral(&compressed, "x"); + + string uncompressed; + DataEndingAtUnreadablePage c(compressed); + CHECK(snappy::Uncompress(c.data(), c.size(), &uncompressed)); + CHECK_EQ(uncompressed, string("x")); +} + +// Check for an infinite loop caused by a copy with offset==0 +TEST(Snappy, ZeroOffsetCopy) { + const char* compressed = "\x40\x12\x00\x00"; + // \x40 Length (must be > kMaxIncrementCopyOverflow) + // \x12\x00\x00 Copy with offset==0, length==5 + char uncompressed[100]; + EXPECT_FALSE(snappy::RawUncompress(compressed, 4, uncompressed)); +} + +TEST(Snappy, ZeroOffsetCopyValidation) { + const char* compressed = "\x05\x12\x00\x00"; + // \x05 Length + // \x12\x00\x00 Copy with offset==0, length==5 + EXPECT_FALSE(snappy::IsValidCompressedBuffer(compressed, 4)); +} + +namespace { + +int TestFindMatchLength(const char* s1, const char *s2, unsigned length) { + return snappy::internal::FindMatchLength(s1, s2, s2 + length); +} + +} // namespace + +TEST(Snappy, FindMatchLength) { + // Exercise all different code paths through the function. + // 64-bit version: + + // Hit s1_limit in 64-bit loop, hit s1_limit in single-character loop. + EXPECT_EQ(6, TestFindMatchLength("012345", "012345", 6)); + EXPECT_EQ(11, TestFindMatchLength("01234567abc", "01234567abc", 11)); + + // Hit s1_limit in 64-bit loop, find a non-match in single-character loop. + EXPECT_EQ(9, TestFindMatchLength("01234567abc", "01234567axc", 9)); + + // Same, but edge cases. + EXPECT_EQ(11, TestFindMatchLength("01234567abc!", "01234567abc!", 11)); + EXPECT_EQ(11, TestFindMatchLength("01234567abc!", "01234567abc?", 11)); + + // Find non-match at once in first loop. + EXPECT_EQ(0, TestFindMatchLength("01234567xxxxxxxx", "?1234567xxxxxxxx", 16)); + EXPECT_EQ(1, TestFindMatchLength("01234567xxxxxxxx", "0?234567xxxxxxxx", 16)); + EXPECT_EQ(4, TestFindMatchLength("01234567xxxxxxxx", "01237654xxxxxxxx", 16)); + EXPECT_EQ(7, TestFindMatchLength("01234567xxxxxxxx", "0123456?xxxxxxxx", 16)); + + // Find non-match in first loop after one block. + EXPECT_EQ(8, TestFindMatchLength("abcdefgh01234567xxxxxxxx", + "abcdefgh?1234567xxxxxxxx", 24)); + EXPECT_EQ(9, TestFindMatchLength("abcdefgh01234567xxxxxxxx", + "abcdefgh0?234567xxxxxxxx", 24)); + EXPECT_EQ(12, TestFindMatchLength("abcdefgh01234567xxxxxxxx", + "abcdefgh01237654xxxxxxxx", 24)); + EXPECT_EQ(15, TestFindMatchLength("abcdefgh01234567xxxxxxxx", + "abcdefgh0123456?xxxxxxxx", 24)); + + // 32-bit version: + + // Short matches. + EXPECT_EQ(0, TestFindMatchLength("01234567", "?1234567", 8)); + EXPECT_EQ(1, TestFindMatchLength("01234567", "0?234567", 8)); + EXPECT_EQ(2, TestFindMatchLength("01234567", "01?34567", 8)); + EXPECT_EQ(3, TestFindMatchLength("01234567", "012?4567", 8)); + EXPECT_EQ(4, TestFindMatchLength("01234567", "0123?567", 8)); + EXPECT_EQ(5, TestFindMatchLength("01234567", "01234?67", 8)); + EXPECT_EQ(6, TestFindMatchLength("01234567", "012345?7", 8)); + EXPECT_EQ(7, TestFindMatchLength("01234567", "0123456?", 8)); + EXPECT_EQ(7, TestFindMatchLength("01234567", "0123456?", 7)); + EXPECT_EQ(7, TestFindMatchLength("01234567!", "0123456??", 7)); + + // Hit s1_limit in 32-bit loop, hit s1_limit in single-character loop. + EXPECT_EQ(10, TestFindMatchLength("xxxxxxabcd", "xxxxxxabcd", 10)); + EXPECT_EQ(10, TestFindMatchLength("xxxxxxabcd?", "xxxxxxabcd?", 10)); + EXPECT_EQ(13, TestFindMatchLength("xxxxxxabcdef", "xxxxxxabcdef", 13)); + + // Same, but edge cases. + EXPECT_EQ(12, TestFindMatchLength("xxxxxx0123abc!", "xxxxxx0123abc!", 12)); + EXPECT_EQ(12, TestFindMatchLength("xxxxxx0123abc!", "xxxxxx0123abc?", 12)); + + // Hit s1_limit in 32-bit loop, find a non-match in single-character loop. + EXPECT_EQ(11, TestFindMatchLength("xxxxxx0123abc", "xxxxxx0123axc", 13)); + + // Find non-match at once in first loop. + EXPECT_EQ(6, TestFindMatchLength("xxxxxx0123xxxxxxxx", + "xxxxxx?123xxxxxxxx", 18)); + EXPECT_EQ(7, TestFindMatchLength("xxxxxx0123xxxxxxxx", + "xxxxxx0?23xxxxxxxx", 18)); + EXPECT_EQ(8, TestFindMatchLength("xxxxxx0123xxxxxxxx", + "xxxxxx0132xxxxxxxx", 18)); + EXPECT_EQ(9, TestFindMatchLength("xxxxxx0123xxxxxxxx", + "xxxxxx012?xxxxxxxx", 18)); + + // Same, but edge cases. + EXPECT_EQ(6, TestFindMatchLength("xxxxxx0123", "xxxxxx?123", 10)); + EXPECT_EQ(7, TestFindMatchLength("xxxxxx0123", "xxxxxx0?23", 10)); + EXPECT_EQ(8, TestFindMatchLength("xxxxxx0123", "xxxxxx0132", 10)); + EXPECT_EQ(9, TestFindMatchLength("xxxxxx0123", "xxxxxx012?", 10)); + + // Find non-match in first loop after one block. + EXPECT_EQ(10, TestFindMatchLength("xxxxxxabcd0123xx", + "xxxxxxabcd?123xx", 16)); + EXPECT_EQ(11, TestFindMatchLength("xxxxxxabcd0123xx", + "xxxxxxabcd0?23xx", 16)); + EXPECT_EQ(12, TestFindMatchLength("xxxxxxabcd0123xx", + "xxxxxxabcd0132xx", 16)); + EXPECT_EQ(13, TestFindMatchLength("xxxxxxabcd0123xx", + "xxxxxxabcd012?xx", 16)); + + // Same, but edge cases. + EXPECT_EQ(10, TestFindMatchLength("xxxxxxabcd0123", "xxxxxxabcd?123", 14)); + EXPECT_EQ(11, TestFindMatchLength("xxxxxxabcd0123", "xxxxxxabcd0?23", 14)); + EXPECT_EQ(12, TestFindMatchLength("xxxxxxabcd0123", "xxxxxxabcd0132", 14)); + EXPECT_EQ(13, TestFindMatchLength("xxxxxxabcd0123", "xxxxxxabcd012?", 14)); +} + +TEST(Snappy, FindMatchLengthRandom) { + const int kNumTrials = 10000; + const int kTypicalLength = 10; + ACMRandom rnd(FLAGS_test_random_seed); + + for (int i = 0; i < kNumTrials; i++) { + string s, t; + char a = rnd.Rand8(); + char b = rnd.Rand8(); + while (!rnd.OneIn(kTypicalLength)) { + s.push_back(rnd.OneIn(2) ? a : b); + t.push_back(rnd.OneIn(2) ? a : b); + } + DataEndingAtUnreadablePage u(s); + DataEndingAtUnreadablePage v(t); + int matched = snappy::internal::FindMatchLength( + u.data(), v.data(), v.data() + t.size()); + if (matched == t.size()) { + EXPECT_EQ(s, t); + } else { + EXPECT_NE(s[matched], t[matched]); + for (int j = 0; j < matched; j++) { + EXPECT_EQ(s[j], t[j]); + } + } + } +} + +static uint16 MakeEntry(unsigned int extra, + unsigned int len, + unsigned int copy_offset) { + // Check that all of the fields fit within the allocated space + assert(extra == (extra & 0x7)); // At most 3 bits + assert(copy_offset == (copy_offset & 0x7)); // At most 3 bits + assert(len == (len & 0x7f)); // At most 7 bits + return len | (copy_offset << 8) | (extra << 11); +} + +// Check that the decompression table is correct, and optionally print out +// the computed one. +TEST(Snappy, VerifyCharTable) { + using snappy::internal::LITERAL; + using snappy::internal::COPY_1_BYTE_OFFSET; + using snappy::internal::COPY_2_BYTE_OFFSET; + using snappy::internal::COPY_4_BYTE_OFFSET; + using snappy::internal::char_table; + using snappy::internal::wordmask; + + uint16 dst[256]; + + // Place invalid entries in all places to detect missing initialization + int assigned = 0; + for (int i = 0; i < 256; i++) { + dst[i] = 0xffff; + } + + // Small LITERAL entries. We store (len-1) in the top 6 bits. + for (unsigned int len = 1; len <= 60; len++) { + dst[LITERAL | ((len-1) << 2)] = MakeEntry(0, len, 0); + assigned++; + } + + // Large LITERAL entries. We use 60..63 in the high 6 bits to + // encode the number of bytes of length info that follow the opcode. + for (unsigned int extra_bytes = 1; extra_bytes <= 4; extra_bytes++) { + // We set the length field in the lookup table to 1 because extra + // bytes encode len-1. + dst[LITERAL | ((extra_bytes+59) << 2)] = MakeEntry(extra_bytes, 1, 0); + assigned++; + } + + // COPY_1_BYTE_OFFSET. + // + // The tag byte in the compressed data stores len-4 in 3 bits, and + // offset/256 in 5 bits. offset%256 is stored in the next byte. + // + // This format is used for length in range [4..11] and offset in + // range [0..2047] + for (unsigned int len = 4; len < 12; len++) { + for (unsigned int offset = 0; offset < 2048; offset += 256) { + dst[COPY_1_BYTE_OFFSET | ((len-4)<<2) | ((offset>>8)<<5)] = + MakeEntry(1, len, offset>>8); + assigned++; + } + } + + // COPY_2_BYTE_OFFSET. + // Tag contains len-1 in top 6 bits, and offset in next two bytes. + for (unsigned int len = 1; len <= 64; len++) { + dst[COPY_2_BYTE_OFFSET | ((len-1)<<2)] = MakeEntry(2, len, 0); + assigned++; + } + + // COPY_4_BYTE_OFFSET. + // Tag contents len-1 in top 6 bits, and offset in next four bytes. + for (unsigned int len = 1; len <= 64; len++) { + dst[COPY_4_BYTE_OFFSET | ((len-1)<<2)] = MakeEntry(4, len, 0); + assigned++; + } + + // Check that each entry was initialized exactly once. + EXPECT_EQ(256, assigned) << "Assigned only " << assigned << " of 256"; + for (int i = 0; i < 256; i++) { + EXPECT_NE(0xffff, dst[i]) << "Did not assign byte " << i; + } + + if (FLAGS_snappy_dump_decompression_table) { + printf("static const uint16 char_table[256] = {\n "); + for (int i = 0; i < 256; i++) { + printf("0x%04x%s", + dst[i], + ((i == 255) ? "\n" : (((i%8) == 7) ? ",\n " : ", "))); + } + printf("};\n"); + } + + // Check that computed table matched recorded table. + for (int i = 0; i < 256; i++) { + EXPECT_EQ(dst[i], char_table[i]) << "Mismatch in byte " << i; + } +} + +static void CompressFile(const char* fname) { + string fullinput; + CHECK_OK(file::GetContents(fname, &fullinput, file::Defaults())); + + string compressed; + Compress(fullinput.data(), fullinput.size(), SNAPPY, &compressed, false); + + CHECK_OK(file::SetContents(string(fname).append(".comp"), compressed, + file::Defaults())); +} + +static void UncompressFile(const char* fname) { + string fullinput; + CHECK_OK(file::GetContents(fname, &fullinput, file::Defaults())); + + size_t uncompLength; + CHECK(CheckUncompressedLength(fullinput, &uncompLength)); + + string uncompressed; + uncompressed.resize(uncompLength); + CHECK(snappy::Uncompress(fullinput.data(), fullinput.size(), &uncompressed)); + + CHECK_OK(file::SetContents(string(fname).append(".uncomp"), uncompressed, + file::Defaults())); +} + +static void MeasureFile(const char* fname) { + string fullinput; + CHECK_OK(file::GetContents(fname, &fullinput, file::Defaults())); + printf("%-40s :\n", fname); + + int start_len = (FLAGS_start_len < 0) ? fullinput.size() : FLAGS_start_len; + int end_len = fullinput.size(); + if (FLAGS_end_len >= 0) { + end_len = min<int>(fullinput.size(), FLAGS_end_len); + } + for (int len = start_len; len <= end_len; len++) { + const char* const input = fullinput.data(); + int repeats = (FLAGS_bytes + len) / (len + 1); + if (FLAGS_zlib) Measure(input, len, ZLIB, repeats, 1024<<10); + if (FLAGS_lzo) Measure(input, len, LZO, repeats, 1024<<10); + if (FLAGS_liblzf) Measure(input, len, LIBLZF, repeats, 1024<<10); + if (FLAGS_quicklz) Measure(input, len, QUICKLZ, repeats, 1024<<10); + if (FLAGS_fastlz) Measure(input, len, FASTLZ, repeats, 1024<<10); + if (FLAGS_snappy) Measure(input, len, SNAPPY, repeats, 4096<<10); + + // For block-size based measurements + if (0 && FLAGS_snappy) { + Measure(input, len, SNAPPY, repeats, 8<<10); + Measure(input, len, SNAPPY, repeats, 16<<10); + Measure(input, len, SNAPPY, repeats, 32<<10); + Measure(input, len, SNAPPY, repeats, 64<<10); + Measure(input, len, SNAPPY, repeats, 256<<10); + Measure(input, len, SNAPPY, repeats, 1024<<10); + } + } +} + +static struct { + const char* label; + const char* filename; + size_t size_limit; +} files[] = { + { "html", "html", 0 }, + { "urls", "urls.10K", 0 }, + { "jpg", "fireworks.jpeg", 0 }, + { "jpg_200", "fireworks.jpeg", 200 }, + { "pdf", "paper-100k.pdf", 0 }, + { "html4", "html_x_4", 0 }, + { "txt1", "alice29.txt", 0 }, + { "txt2", "asyoulik.txt", 0 }, + { "txt3", "lcet10.txt", 0 }, + { "txt4", "plrabn12.txt", 0 }, + { "pb", "geo.protodata", 0 }, + { "gaviota", "kppkn.gtb", 0 }, +}; + +static void BM_UFlat(int iters, int arg) { + StopBenchmarkTiming(); + + // Pick file to process based on "arg" + CHECK_GE(arg, 0); + CHECK_LT(arg, ARRAYSIZE(files)); + string contents = ReadTestDataFile(files[arg].filename, + files[arg].size_limit); + + string zcontents; + snappy::Compress(contents.data(), contents.size(), &zcontents); + char* dst = new char[contents.size()]; + + SetBenchmarkBytesProcessed(static_cast<int64>(iters) * + static_cast<int64>(contents.size())); + SetBenchmarkLabel(files[arg].label); + StartBenchmarkTiming(); + while (iters-- > 0) { + CHECK(snappy::RawUncompress(zcontents.data(), zcontents.size(), dst)); + } + StopBenchmarkTiming(); + + delete[] dst; +} +BENCHMARK(BM_UFlat)->DenseRange(0, ARRAYSIZE(files) - 1); + +static void BM_UValidate(int iters, int arg) { + StopBenchmarkTiming(); + + // Pick file to process based on "arg" + CHECK_GE(arg, 0); + CHECK_LT(arg, ARRAYSIZE(files)); + string contents = ReadTestDataFile(files[arg].filename, + files[arg].size_limit); + + string zcontents; + snappy::Compress(contents.data(), contents.size(), &zcontents); + + SetBenchmarkBytesProcessed(static_cast<int64>(iters) * + static_cast<int64>(contents.size())); + SetBenchmarkLabel(files[arg].label); + StartBenchmarkTiming(); + while (iters-- > 0) { + CHECK(snappy::IsValidCompressedBuffer(zcontents.data(), zcontents.size())); + } + StopBenchmarkTiming(); +} +BENCHMARK(BM_UValidate)->DenseRange(0, 4); + +static void BM_UIOVec(int iters, int arg) { + StopBenchmarkTiming(); + + // Pick file to process based on "arg" + CHECK_GE(arg, 0); + CHECK_LT(arg, ARRAYSIZE(files)); + string contents = ReadTestDataFile(files[arg].filename, + files[arg].size_limit); + + string zcontents; + snappy::Compress(contents.data(), contents.size(), &zcontents); + + // Uncompress into an iovec containing ten entries. + const int kNumEntries = 10; + struct iovec iov[kNumEntries]; + char *dst = new char[contents.size()]; + int used_so_far = 0; + for (int i = 0; i < kNumEntries; ++i) { + iov[i].iov_base = dst + used_so_far; + if (used_so_far == contents.size()) { + iov[i].iov_len = 0; + continue; + } + + if (i == kNumEntries - 1) { + iov[i].iov_len = contents.size() - used_so_far; + } else { + iov[i].iov_len = contents.size() / kNumEntries; + } + used_so_far += iov[i].iov_len; + } + + SetBenchmarkBytesProcessed(static_cast<int64>(iters) * + static_cast<int64>(contents.size())); + SetBenchmarkLabel(files[arg].label); + StartBenchmarkTiming(); + while (iters-- > 0) { + CHECK(snappy::RawUncompressToIOVec(zcontents.data(), zcontents.size(), iov, + kNumEntries)); + } + StopBenchmarkTiming(); + + delete[] dst; +} +BENCHMARK(BM_UIOVec)->DenseRange(0, 4); + +static void BM_UFlatSink(int iters, int arg) { + StopBenchmarkTiming(); + + // Pick file to process based on "arg" + CHECK_GE(arg, 0); + CHECK_LT(arg, ARRAYSIZE(files)); + string contents = ReadTestDataFile(files[arg].filename, + files[arg].size_limit); + + string zcontents; + snappy::Compress(contents.data(), contents.size(), &zcontents); + char* dst = new char[contents.size()]; + + SetBenchmarkBytesProcessed(static_cast<int64>(iters) * + static_cast<int64>(contents.size())); + SetBenchmarkLabel(files[arg].label); + StartBenchmarkTiming(); + while (iters-- > 0) { + snappy::ByteArraySource source(zcontents.data(), zcontents.size()); + snappy::UncheckedByteArraySink sink(dst); + CHECK(snappy::Uncompress(&source, &sink)); + } + StopBenchmarkTiming(); + + string s(dst, contents.size()); + CHECK_EQ(contents, s); + + delete[] dst; +} + +BENCHMARK(BM_UFlatSink)->DenseRange(0, ARRAYSIZE(files) - 1); + +static void BM_ZFlat(int iters, int arg) { + StopBenchmarkTiming(); + + // Pick file to process based on "arg" + CHECK_GE(arg, 0); + CHECK_LT(arg, ARRAYSIZE(files)); + string contents = ReadTestDataFile(files[arg].filename, + files[arg].size_limit); + + char* dst = new char[snappy::MaxCompressedLength(contents.size())]; + + SetBenchmarkBytesProcessed(static_cast<int64>(iters) * + static_cast<int64>(contents.size())); + StartBenchmarkTiming(); + + size_t zsize = 0; + while (iters-- > 0) { + snappy::RawCompress(contents.data(), contents.size(), dst, &zsize); + } + StopBenchmarkTiming(); + const double compression_ratio = + static_cast<double>(zsize) / std::max<size_t>(1, contents.size()); + SetBenchmarkLabel(StringPrintf("%s (%.2f %%)", + files[arg].label, 100.0 * compression_ratio)); + VLOG(0) << StringPrintf("compression for %s: %zd -> %zd bytes", + files[arg].label, contents.size(), zsize); + delete[] dst; +} +BENCHMARK(BM_ZFlat)->DenseRange(0, ARRAYSIZE(files) - 1); + +} // namespace snappy + + +int main(int argc, char** argv) { + InitGoogle(argv[0], &argc, &argv, true); + RunSpecifiedBenchmarks(); + + if (argc >= 2) { + for (int arg = 1; arg < argc; arg++) { + if (FLAGS_write_compressed) { + CompressFile(argv[arg]); + } else if (FLAGS_write_uncompressed) { + UncompressFile(argv[arg]); + } else { + MeasureFile(argv[arg]); + } + } + return 0; + } + + return RUN_ALL_TESTS(); +} |