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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
commit | 19fcec84d8d7d21e796c7624e521b60d28ee21ed (patch) | |
tree | 42d26aa27d1e3f7c0b8bd3fd14e7d7082f5008dc /src/zstd/contrib/single_file_libs/examples/simple.c | |
parent | Initial commit. (diff) | |
download | ceph-upstream.tar.xz ceph-upstream.zip |
Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/zstd/contrib/single_file_libs/examples/simple.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/src/zstd/contrib/single_file_libs/examples/simple.c b/src/zstd/contrib/single_file_libs/examples/simple.c new file mode 100644 index 000000000..ee63416a6 --- /dev/null +++ b/src/zstd/contrib/single_file_libs/examples/simple.c @@ -0,0 +1,75 @@ +/** + * \file simple.c + * Simple standalone example of using the single-file \c zstddeclib. + * + * \note In this simple example we include the amalgamated source and compile + * just this single file, but we could equally (and more conventionally) + * include \c zstd.h and compile both this file and \c zstddeclib.c (the + * resulting binaries differ slightly in size but perform the same). + * + * \author Carl Woffenden, Numfum GmbH (released under a CC0 license) + */ + +#include <stddef.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "../zstddeclib.c" + +//************************* Test Data (DXT texture) **************************/ + +/** + * Raw 256x256 DXT1 data (used to compare the result). + * \n + * See \c testcard.png for the original. + */ +static uint8_t const rawDxt1[] = { +#include "testcard-dxt1.inl" +}; + +/** + * Zstd compressed version of \c #rawDxt1. + * \n + * See \c testcard.png for the original. + */ +static uint8_t const srcZstd[] = { +#include "testcard-zstd.inl" +}; + +/** + * Destination for decoding \c #srcZstd. + */ +static uint8_t dstDxt1[sizeof rawDxt1] = {}; + +#ifndef ZSTD_VERSION_MAJOR +/** + * For the case where the decompression library hasn't been included we add a + * dummy function to fake the process and stop the buffers being optimised out. + */ +size_t ZSTD_decompress(void* dst, size_t dstLen, const void* src, size_t srcLen) { + return (memcmp(dst, src, (srcLen < dstLen) ? srcLen : dstLen)) ? 0 : dstLen; +} +#endif + +//****************************************************************************/ + +/** + * Simple single-file test to decompress \c #srcZstd into \c # dstDxt1 then + * compare the resulting bytes with \c #rawDxt1. + * \n + * As a (naive) comparison, removing Zstd and building with "-Os -g0 simple.c" + * results in a 44kB binary (macOS 10.14, Clang 10); re-adding Zstd increases + * the binary by 56kB (after calling \c strip). + */ +int main() { + size_t size = ZSTD_decompress(dstDxt1, sizeof dstDxt1, srcZstd, sizeof srcZstd); + int compare = memcmp(rawDxt1, dstDxt1, sizeof dstDxt1); + printf("Decompressed size: %s\n", (size == sizeof dstDxt1) ? "PASSED" : "FAILED"); + printf("Byte comparison: %s\n", (compare == 0) ? "PASSED" : "FAILED"); + if (size == sizeof dstDxt1 && compare == 0) { + return EXIT_SUCCESS; + } + return EXIT_FAILURE; +} |