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+// 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();
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 20:11:29 +0000