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/**
* Copyright (c) 2016-present, 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).
*/
/**
* This fuzz target performs a zstd round-trip test (compress & decompress),
* compares the result with the original, and calls abort() on corruption.
*/
#define ZSTD_STATIC_LINKING_ONLY
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "fuzz_helpers.h"
#include "zstd.h"
static const int kMaxClevel = 19;
static ZSTD_CCtx *cctx = NULL;
static ZSTD_DCtx *dctx = NULL;
static void* cBuf = NULL;
static void* rBuf = NULL;
static size_t bufSize = 0;
static uint32_t seed;
static size_t roundTripTest(void *result, size_t resultCapacity,
void *compressed, size_t compressedCapacity,
const void *src, size_t srcSize)
{
int const cLevel = FUZZ_rand(&seed) % kMaxClevel;
ZSTD_parameters const params = ZSTD_getParams(cLevel, srcSize, 0);
size_t ret = ZSTD_compressBegin_advanced(cctx, NULL, 0, params, srcSize);
FUZZ_ZASSERT(ret);
ret = ZSTD_compressBlock(cctx, compressed, compressedCapacity, src, srcSize);
FUZZ_ZASSERT(ret);
if (ret == 0) {
FUZZ_ASSERT(resultCapacity >= srcSize);
memcpy(result, src, srcSize);
return srcSize;
}
ZSTD_decompressBegin(dctx);
return ZSTD_decompressBlock(dctx, result, resultCapacity, compressed, ret);
}
int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
{
size_t neededBufSize;
seed = FUZZ_seed(&src, &size);
neededBufSize = size;
if (size > ZSTD_BLOCKSIZE_MAX)
return 0;
/* Allocate all buffers and contexts if not already allocated */
if (neededBufSize > bufSize || !cBuf || !rBuf) {
free(cBuf);
free(rBuf);
cBuf = malloc(neededBufSize);
rBuf = malloc(neededBufSize);
bufSize = neededBufSize;
FUZZ_ASSERT(cBuf && rBuf);
}
if (!cctx) {
cctx = ZSTD_createCCtx();
FUZZ_ASSERT(cctx);
}
if (!dctx) {
dctx = ZSTD_createDCtx();
FUZZ_ASSERT(dctx);
}
{
size_t const result =
roundTripTest(rBuf, neededBufSize, cBuf, neededBufSize, src, size);
FUZZ_ZASSERT(result);
FUZZ_ASSERT_MSG(result == size, "Incorrect regenerated size");
FUZZ_ASSERT_MSG(!memcmp(src, rBuf, size), "Corruption!");
}
#ifndef STATEFUL_FUZZING
ZSTD_freeCCtx(cctx); cctx = NULL;
ZSTD_freeDCtx(dctx); dctx = NULL;
#endif
return 0;
}
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