Created
December 10, 2016 04:07
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#define ZSTD_STATIC_LINKING_ONLY | |
#include <zstd.h> | |
#include <stdio.h> | |
#include <stddef.h> | |
#include <stdlib.h> | |
void compress(ZSTD_CStream *ctx, ZSTD_outBuffer out, const void *data, size_t size) { | |
ZSTD_inBuffer in = { data, size, 0 }; | |
while (in.pos < in.size) { | |
ZSTD_outBuffer tmp = out; | |
const size_t rc = ZSTD_compressStream(ctx, &tmp, &in); | |
if (ZSTD_isError(rc)) { | |
exit(5); | |
} | |
} | |
#if 1 | |
ZSTD_outBuffer tmp = out; | |
const size_t rc = ZSTD_flushStream(ctx, &tmp); | |
if (rc != 0) { exit(6); } | |
#endif | |
} | |
int main() { | |
ZSTD_CStream *ctx = ZSTD_createCStream(); | |
if (!ctx) { return 1; } | |
ZSTD_parameters params = {}; | |
params.cParams.windowLog = 18; | |
params.cParams.chainLog = 13; | |
params.cParams.hashLog = 14; | |
params.cParams.searchLog = 1; | |
params.cParams.searchLength = 7; | |
params.cParams.targetLength = 16; | |
params.cParams.strategy = ZSTD_fast; | |
const unsigned windowLog = params.cParams.windowLog; | |
size_t rc = ZSTD_initCStream_advanced(ctx, NULL, 0, params, 0); | |
if (ZSTD_isError(rc)) { return 2; } | |
const char match[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; | |
const size_t randomData = (1 << windowLog) - 2*sizeof(match); | |
char *srcBuffer = (char*) malloc(1 << windowLog); | |
char *dstBuffer = (char*) malloc(ZSTD_compressBound(1 << windowLog)); | |
ZSTD_outBuffer out = { dstBuffer, ZSTD_compressBound(1 << windowLog), 0 }; | |
for (size_t i = 0; i < sizeof(match); ++i) { | |
srcBuffer[i] = match[i]; | |
} | |
for (size_t i = 0; i < randomData; ++i) { | |
srcBuffer[sizeof(match) + i] = (char)(rand() & 0xFF); | |
} | |
for (size_t i = 0; i < sizeof(match); ++i) { | |
srcBuffer[sizeof(match) + randomData + i] = match[i]; | |
} | |
const size_t size = 1 << windowLog; | |
compress(ctx, out, srcBuffer, size); | |
size_t pos = 0; | |
while (1) { | |
if (pos == size) { pos = 0; } | |
const size_t block = rand() % (size - pos + 1); | |
compress(ctx, out, srcBuffer + pos, block); | |
pos += block; | |
} | |
} |
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