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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.
*/
/**
* This fuzz target performs a zstd round-trip test (compress & decompress) with
* a raw content dictionary, compares the result with the original, and calls
* abort() on corruption.
*/
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "fuzz_helpers.h"
#include "zstd_helpers.h"
#include "fuzz_data_producer.h"
static ZSTD_CCtx *cctx = NULL;
static ZSTD_DCtx *dctx = NULL;
static size_t roundTripTest(void *result, size_t resultCapacity,
void *compressed, size_t compressedCapacity,
const void *src, size_t srcSize,
const void *dict, size_t dictSize,
FUZZ_dataProducer_t *producer)
{
ZSTD_dictContentType_e const dictContentType = ZSTD_dct_rawContent;
int const refPrefix = FUZZ_dataProducer_uint32Range(producer, 0, 1) != 0;
size_t cSize;
FUZZ_setRandomParameters(cctx, srcSize, producer);
/* Disable checksum so we can use sizes smaller than compress bound. */
FUZZ_ZASSERT(ZSTD_CCtx_setParameter(cctx, ZSTD_c_checksumFlag, 0));
if (refPrefix)
FUZZ_ZASSERT(ZSTD_CCtx_refPrefix_advanced(
cctx, dict, dictSize,
ZSTD_dct_rawContent));
else
FUZZ_ZASSERT(ZSTD_CCtx_loadDictionary_advanced(
cctx, dict, dictSize,
(ZSTD_dictLoadMethod_e)FUZZ_dataProducer_uint32Range(producer, 0, 1),
ZSTD_dct_rawContent));
cSize = ZSTD_compress2(cctx, compressed, compressedCapacity, src, srcSize);
FUZZ_ZASSERT(cSize);
if (refPrefix)
FUZZ_ZASSERT(ZSTD_DCtx_refPrefix_advanced(
dctx, dict, dictSize,
dictContentType));
else
FUZZ_ZASSERT(ZSTD_DCtx_loadDictionary_advanced(
dctx, dict, dictSize,
(ZSTD_dictLoadMethod_e)FUZZ_dataProducer_uint32Range(producer, 0, 1),
dictContentType));
{
size_t const ret = ZSTD_decompressDCtx(
dctx, result, resultCapacity, compressed, cSize);
return ret;
}
}
int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
{
/* Give a random portion of src data to the producer, to use for
parameter generation. The rest will be used for (de)compression */
FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size);
size = FUZZ_dataProducer_reserveDataPrefix(producer);
uint8_t const* const srcBuf = src;
size_t const srcSize = FUZZ_dataProducer_uint32Range(producer, 0, size);
uint8_t const* const dictBuf = srcBuf + srcSize;
size_t const dictSize = size - srcSize;
size_t const decompSize = srcSize;
void* const decompBuf = FUZZ_malloc(decompSize);
size_t compSize = ZSTD_compressBound(srcSize);
void* compBuf;
/* Half of the time fuzz with a 1 byte smaller output size.
* This will still succeed because we force the checksum to be disabled,
* giving us 4 bytes of overhead.
*/
compSize -= FUZZ_dataProducer_uint32Range(producer, 0, 1);
compBuf = FUZZ_malloc(compSize);
if (!cctx) {
cctx = ZSTD_createCCtx();
FUZZ_ASSERT(cctx);
}
if (!dctx) {
dctx = ZSTD_createDCtx();
FUZZ_ASSERT(dctx);
}
{
size_t const result =
roundTripTest(decompBuf, decompSize, compBuf, compSize, srcBuf, srcSize, dictBuf, dictSize, producer);
FUZZ_ZASSERT(result);
FUZZ_ASSERT_MSG(result == srcSize, "Incorrect regenerated size");
FUZZ_ASSERT_MSG(!FUZZ_memcmp(src, decompBuf, srcSize), "Corruption!");
}
free(decompBuf);
free(compBuf);
FUZZ_dataProducer_free(producer);
#ifndef STATEFUL_FUZZING
ZSTD_freeCCtx(cctx); cctx = NULL;
ZSTD_freeDCtx(dctx); dctx = NULL;
#endif
return 0;
}
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