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/**
* \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;
}
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