2 * Copyright (c) Meta Platforms, Inc. and affiliates.
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).
8 * You may select, at your option, one of the above-listed licenses.
12 * This fuzz target performs a zstd round-trip test (compress & decompress),
13 * compares the result with the original, and calls abort() on corruption.
16 #define ZSTD_STATIC_LINKING_ONLY
22 #include "fuzz_helpers.h"
24 #include "zstd_helpers.h"
25 #include "fuzz_data_producer.h"
26 #include "fuzz_third_party_seq_prod.h"
28 static ZSTD_CCtx *cctx = NULL;
29 static ZSTD_DCtx *dctx = NULL;
30 static void* cBuf = NULL;
31 static void* rBuf = NULL;
32 static size_t bufSize = 0;
34 static size_t roundTripTest(void *result, size_t resultCapacity,
35 void *compressed, size_t compressedCapacity,
36 const void *src, size_t srcSize,
39 ZSTD_parameters const params = ZSTD_getParams(cLevel, srcSize, 0);
40 size_t ret = ZSTD_compressBegin_advanced(cctx, NULL, 0, params, srcSize);
43 ret = ZSTD_compressBlock(cctx, compressed, compressedCapacity, src, srcSize);
46 FUZZ_ASSERT(resultCapacity >= srcSize);
48 memcpy(result, src, srcSize);
52 ZSTD_decompressBegin(dctx);
53 return ZSTD_decompressBlock(dctx, result, resultCapacity, compressed, ret);
56 int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
58 FUZZ_SEQ_PROD_SETUP();
60 /* Give a random portion of src data to the producer, to use for
61 parameter generation. The rest will be used for (de)compression */
62 FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size);
63 size = FUZZ_dataProducer_reserveDataPrefix(producer);
65 int const cLevel = FUZZ_dataProducer_int32Range(producer, kMinClevel, kMaxClevel);
67 size_t neededBufSize = size;
68 if (size > ZSTD_BLOCKSIZE_MAX)
69 size = ZSTD_BLOCKSIZE_MAX;
71 /* Allocate all buffers and contexts if not already allocated */
72 if (neededBufSize > bufSize || !cBuf || !rBuf) {
75 cBuf = FUZZ_malloc(neededBufSize);
76 rBuf = FUZZ_malloc(neededBufSize);
77 bufSize = neededBufSize;
80 cctx = ZSTD_createCCtx();
84 dctx = ZSTD_createDCtx();
90 roundTripTest(rBuf, neededBufSize, cBuf, neededBufSize, src, size,
93 FUZZ_ASSERT_MSG(result == size, "Incorrect regenerated size");
94 FUZZ_ASSERT_MSG(!FUZZ_memcmp(src, rBuf, size), "Corruption!");
96 FUZZ_dataProducer_free(producer);
97 #ifndef STATEFUL_FUZZING
98 ZSTD_freeCCtx(cctx); cctx = NULL;
99 ZSTD_freeDCtx(dctx); dctx = NULL;
101 FUZZ_SEQ_PROD_TEARDOWN();