2 * Copyright (c) 2016-present, Facebook, Inc.
5 * This source code is licensed under both the BSD-style license (found in the
6 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
7 * in the COPYING file in the root directory of this source tree).
10 #define ZSTD_STATIC_LINKING_ONLY
11 #define ZDICT_STATIC_LINKING_ONLY
15 #include "zstd_helpers.h"
16 #include "fuzz_helpers.h"
20 const int kMinClevel = -3;
21 const int kMaxClevel = 19;
23 static void set(ZSTD_CCtx *cctx, ZSTD_cParameter param, int value)
25 FUZZ_ZASSERT(ZSTD_CCtx_setParameter(cctx, param, value));
28 static void setRand(ZSTD_CCtx *cctx, ZSTD_cParameter param, unsigned min,
29 unsigned max, FUZZ_dataProducer_t *producer) {
30 unsigned const value = FUZZ_dataProducer_uint32Range(producer, min, max);
31 set(cctx, param, value);
34 ZSTD_compressionParameters FUZZ_randomCParams(size_t srcSize, FUZZ_dataProducer_t *producer)
36 /* Select compression parameters */
37 ZSTD_compressionParameters cParams;
38 cParams.windowLog = FUZZ_dataProducer_uint32Range(producer, ZSTD_WINDOWLOG_MIN, 15);
39 cParams.hashLog = FUZZ_dataProducer_uint32Range(producer, ZSTD_HASHLOG_MIN, 15);
40 cParams.chainLog = FUZZ_dataProducer_uint32Range(producer, ZSTD_CHAINLOG_MIN, 16);
41 cParams.searchLog = FUZZ_dataProducer_uint32Range(producer, ZSTD_SEARCHLOG_MIN, 9);
42 cParams.minMatch = FUZZ_dataProducer_uint32Range(producer, ZSTD_MINMATCH_MIN,
44 cParams.targetLength = FUZZ_dataProducer_uint32Range(producer, 0, 512);
45 cParams.strategy = FUZZ_dataProducer_uint32Range(producer, ZSTD_STRATEGY_MIN, ZSTD_STRATEGY_MAX);
46 return ZSTD_adjustCParams(cParams, srcSize, 0);
49 ZSTD_frameParameters FUZZ_randomFParams(FUZZ_dataProducer_t *producer)
51 /* Select frame parameters */
52 ZSTD_frameParameters fParams;
53 fParams.contentSizeFlag = FUZZ_dataProducer_uint32Range(producer, 0, 1);
54 fParams.checksumFlag = FUZZ_dataProducer_uint32Range(producer, 0, 1);
55 fParams.noDictIDFlag = FUZZ_dataProducer_uint32Range(producer, 0, 1);
59 ZSTD_parameters FUZZ_randomParams(size_t srcSize, FUZZ_dataProducer_t *producer)
61 ZSTD_parameters params;
62 params.cParams = FUZZ_randomCParams(srcSize, producer);
63 params.fParams = FUZZ_randomFParams(producer);
67 void FUZZ_setRandomParameters(ZSTD_CCtx *cctx, size_t srcSize, FUZZ_dataProducer_t *producer)
69 ZSTD_compressionParameters cParams = FUZZ_randomCParams(srcSize, producer);
70 set(cctx, ZSTD_c_windowLog, cParams.windowLog);
71 set(cctx, ZSTD_c_hashLog, cParams.hashLog);
72 set(cctx, ZSTD_c_chainLog, cParams.chainLog);
73 set(cctx, ZSTD_c_searchLog, cParams.searchLog);
74 set(cctx, ZSTD_c_minMatch, cParams.minMatch);
75 set(cctx, ZSTD_c_targetLength, cParams.targetLength);
76 set(cctx, ZSTD_c_strategy, cParams.strategy);
77 /* Select frame parameters */
78 setRand(cctx, ZSTD_c_contentSizeFlag, 0, 1, producer);
79 setRand(cctx, ZSTD_c_checksumFlag, 0, 1, producer);
80 setRand(cctx, ZSTD_c_dictIDFlag, 0, 1, producer);
81 /* Select long distance matching parameters */
82 setRand(cctx, ZSTD_c_enableLongDistanceMatching, 0, 1, producer);
83 setRand(cctx, ZSTD_c_ldmHashLog, ZSTD_HASHLOG_MIN, 16, producer);
84 setRand(cctx, ZSTD_c_ldmMinMatch, ZSTD_LDM_MINMATCH_MIN,
85 ZSTD_LDM_MINMATCH_MAX, producer);
86 setRand(cctx, ZSTD_c_ldmBucketSizeLog, 0, ZSTD_LDM_BUCKETSIZELOG_MAX,
88 setRand(cctx, ZSTD_c_ldmHashRateLog, ZSTD_LDM_HASHRATELOG_MIN,
89 ZSTD_LDM_HASHRATELOG_MAX, producer);
90 /* Set misc parameters */
91 setRand(cctx, ZSTD_c_nbWorkers, 0, 2, producer);
92 setRand(cctx, ZSTD_c_rsyncable, 0, 1, producer);
93 setRand(cctx, ZSTD_c_forceMaxWindow, 0, 1, producer);
94 setRand(cctx, ZSTD_c_literalCompressionMode, 0, 2, producer);
95 setRand(cctx, ZSTD_c_forceAttachDict, 0, 2, producer);
96 if (FUZZ_dataProducer_uint32Range(producer, 0, 1) == 0) {
97 setRand(cctx, ZSTD_c_srcSizeHint, ZSTD_SRCSIZEHINT_MIN, 2 * srcSize, producer);
101 FUZZ_dict_t FUZZ_train(void const* src, size_t srcSize, FUZZ_dataProducer_t *producer)
103 size_t const dictSize = MAX(srcSize / 8, 1024);
104 size_t const totalSampleSize = dictSize * 11;
105 FUZZ_dict_t dict = { malloc(dictSize), dictSize };
106 char* const samples = (char*)malloc(totalSampleSize);
107 unsigned nbSamples = 100;
108 size_t* const samplesSizes = (size_t*)malloc(sizeof(size_t) * nbSamples);
111 ZDICT_fastCover_params_t params;
112 FUZZ_ASSERT(dict.buff && samples && samplesSizes);
114 for (sample = 0; sample < nbSamples; ++sample) {
115 size_t const remaining = totalSampleSize - pos;
116 size_t const offset = FUZZ_dataProducer_uint32Range(producer, 0, MAX(srcSize, 1) - 1);
117 size_t const limit = MIN(srcSize - offset, remaining);
118 size_t const toCopy = MIN(limit, remaining / (nbSamples - sample));
119 memcpy(samples + pos, src + offset, toCopy);
121 samplesSizes[sample] = toCopy;
124 memset(samples + pos, 0, totalSampleSize - pos);
126 memset(¶ms, 0, sizeof(params));
131 params.zParams.compressionLevel = 1;
132 dict.size = ZDICT_trainFromBuffer_fastCover(dict.buff, dictSize,
133 samples, samplesSizes, nbSamples, params);
134 if (ZSTD_isError(dict.size)) {
136 memset(&dict, 0, sizeof(dict));