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/*
* Copyright (c) 2016-2020, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under both the BSD-style license (found in the
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
* in the COPYING file in the root directory of this source tree).
* You may select, at your option, one of the above-listed licenses.
*/
#define ZSTD_STATIC_LINKING_ONLY
#define ZDICT_STATIC_LINKING_ONLY
#include <string.h>
#include "zstd_helpers.h"
#include "fuzz_helpers.h"
#include "zstd.h"
#include "zdict.h"
const int kMinClevel = -3;
const int kMaxClevel = 19;
static void set(ZSTD_CCtx *cctx, ZSTD_cParameter param, int value)
{
FUZZ_ZASSERT(ZSTD_CCtx_setParameter(cctx, param, value));
}
static void setRand(ZSTD_CCtx *cctx, ZSTD_cParameter param, unsigned min,
unsigned max, FUZZ_dataProducer_t *producer) {
unsigned const value = FUZZ_dataProducer_uint32Range(producer, min, max);
set(cctx, param, value);
}
ZSTD_compressionParameters FUZZ_randomCParams(size_t srcSize, FUZZ_dataProducer_t *producer)
{
/* Select compression parameters */
ZSTD_compressionParameters cParams;
cParams.windowLog = FUZZ_dataProducer_uint32Range(producer, ZSTD_WINDOWLOG_MIN, 15);
cParams.hashLog = FUZZ_dataProducer_uint32Range(producer, ZSTD_HASHLOG_MIN, 15);
cParams.chainLog = FUZZ_dataProducer_uint32Range(producer, ZSTD_CHAINLOG_MIN, 16);
cParams.searchLog = FUZZ_dataProducer_uint32Range(producer, ZSTD_SEARCHLOG_MIN, 9);
cParams.minMatch = FUZZ_dataProducer_uint32Range(producer, ZSTD_MINMATCH_MIN,
ZSTD_MINMATCH_MAX);
cParams.targetLength = FUZZ_dataProducer_uint32Range(producer, 0, 512);
cParams.strategy = FUZZ_dataProducer_uint32Range(producer, ZSTD_STRATEGY_MIN, ZSTD_STRATEGY_MAX);
return ZSTD_adjustCParams(cParams, srcSize, 0);
}
ZSTD_frameParameters FUZZ_randomFParams(FUZZ_dataProducer_t *producer)
{
/* Select frame parameters */
ZSTD_frameParameters fParams;
fParams.contentSizeFlag = FUZZ_dataProducer_uint32Range(producer, 0, 1);
fParams.checksumFlag = FUZZ_dataProducer_uint32Range(producer, 0, 1);
fParams.noDictIDFlag = FUZZ_dataProducer_uint32Range(producer, 0, 1);
return fParams;
}
ZSTD_parameters FUZZ_randomParams(size_t srcSize, FUZZ_dataProducer_t *producer)
{
ZSTD_parameters params;
params.cParams = FUZZ_randomCParams(srcSize, producer);
params.fParams = FUZZ_randomFParams(producer);
return params;
}
void FUZZ_setRandomParameters(ZSTD_CCtx *cctx, size_t srcSize, FUZZ_dataProducer_t *producer)
{
ZSTD_compressionParameters cParams = FUZZ_randomCParams(srcSize, producer);
set(cctx, ZSTD_c_windowLog, cParams.windowLog);
set(cctx, ZSTD_c_hashLog, cParams.hashLog);
set(cctx, ZSTD_c_chainLog, cParams.chainLog);
set(cctx, ZSTD_c_searchLog, cParams.searchLog);
set(cctx, ZSTD_c_minMatch, cParams.minMatch);
set(cctx, ZSTD_c_targetLength, cParams.targetLength);
set(cctx, ZSTD_c_strategy, cParams.strategy);
/* Select frame parameters */
setRand(cctx, ZSTD_c_contentSizeFlag, 0, 1, producer);
setRand(cctx, ZSTD_c_checksumFlag, 0, 1, producer);
setRand(cctx, ZSTD_c_dictIDFlag, 0, 1, producer);
/* Select long distance matching parameters */
setRand(cctx, ZSTD_c_enableLongDistanceMatching, 0, 1, producer);
setRand(cctx, ZSTD_c_ldmHashLog, ZSTD_HASHLOG_MIN, 16, producer);
setRand(cctx, ZSTD_c_ldmMinMatch, ZSTD_LDM_MINMATCH_MIN,
ZSTD_LDM_MINMATCH_MAX, producer);
setRand(cctx, ZSTD_c_ldmBucketSizeLog, 0, ZSTD_LDM_BUCKETSIZELOG_MAX,
producer);
setRand(cctx, ZSTD_c_ldmHashRateLog, ZSTD_LDM_HASHRATELOG_MIN,
ZSTD_LDM_HASHRATELOG_MAX, producer);
/* Set misc parameters */
setRand(cctx, ZSTD_c_nbWorkers, 0, 2, producer);
setRand(cctx, ZSTD_c_rsyncable, 0, 1, producer);
setRand(cctx, ZSTD_c_forceMaxWindow, 0, 1, producer);
setRand(cctx, ZSTD_c_literalCompressionMode, 0, 2, producer);
setRand(cctx, ZSTD_c_forceAttachDict, 0, 2, producer);
if (FUZZ_dataProducer_uint32Range(producer, 0, 1) == 0) {
setRand(cctx, ZSTD_c_srcSizeHint, ZSTD_SRCSIZEHINT_MIN, 2 * srcSize, producer);
}
if (FUZZ_dataProducer_uint32Range(producer, 0, 1) == 0) {
setRand(cctx, ZSTD_c_targetCBlockSize, ZSTD_TARGETCBLOCKSIZE_MIN, ZSTD_TARGETCBLOCKSIZE_MAX, producer);
}
}
FUZZ_dict_t FUZZ_train(void const* src, size_t srcSize, FUZZ_dataProducer_t *producer)
{
size_t const dictSize = MAX(srcSize / 8, 1024);
size_t const totalSampleSize = dictSize * 11;
FUZZ_dict_t dict = { FUZZ_malloc(dictSize), dictSize };
char* const samples = (char*)FUZZ_malloc(totalSampleSize);
unsigned nbSamples = 100;
size_t* const samplesSizes = (size_t*)FUZZ_malloc(sizeof(size_t) * nbSamples);
size_t pos = 0;
size_t sample = 0;
ZDICT_fastCover_params_t params;
for (sample = 0; sample < nbSamples; ++sample) {
size_t const remaining = totalSampleSize - pos;
size_t const offset = FUZZ_dataProducer_uint32Range(producer, 0, MAX(srcSize, 1) - 1);
size_t const limit = MIN(srcSize - offset, remaining);
size_t const toCopy = MIN(limit, remaining / (nbSamples - sample));
memcpy(samples + pos, src + offset, toCopy);
pos += toCopy;
samplesSizes[sample] = toCopy;
}
memset(samples + pos, 0, totalSampleSize - pos);
memset(¶ms, 0, sizeof(params));
params.accel = 5;
params.k = 40;
params.d = 8;
params.f = 14;
params.zParams.compressionLevel = 1;
dict.size = ZDICT_trainFromBuffer_fastCover(dict.buff, dictSize,
samples, samplesSizes, nbSamples, params);
if (ZSTD_isError(dict.size)) {
free(dict.buff);
memset(&dict, 0, sizeof(dict));
}
free(samplesSizes);
free(samples);
return dict;
}
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