mirror of
https://github.com/facebook/zstd.git
synced 2025-11-04 00:02:59 -05:00
116 lines
4.1 KiB
C
116 lines
4.1 KiB
C
/*
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* Copyright (c) 2016-2021, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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/**
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* This fuzz target performs a zstd round-trip test (compress & decompress) with
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* a raw content dictionary, compares the result with the original, and calls
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* abort() on corruption.
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*/
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "fuzz_helpers.h"
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#include "zstd_helpers.h"
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#include "fuzz_data_producer.h"
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static ZSTD_CCtx *cctx = NULL;
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static ZSTD_DCtx *dctx = NULL;
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static size_t roundTripTest(void *result, size_t resultCapacity,
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void *compressed, size_t compressedCapacity,
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const void *src, size_t srcSize,
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const void *dict, size_t dictSize,
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FUZZ_dataProducer_t *producer)
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{
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ZSTD_dictContentType_e const dictContentType = ZSTD_dct_rawContent;
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int const refPrefix = FUZZ_dataProducer_uint32Range(producer, 0, 1) != 0;
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size_t cSize;
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FUZZ_setRandomParameters(cctx, srcSize, producer);
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/* Disable checksum so we can use sizes smaller than compress bound. */
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FUZZ_ZASSERT(ZSTD_CCtx_setParameter(cctx, ZSTD_c_checksumFlag, 0));
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if (refPrefix)
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FUZZ_ZASSERT(ZSTD_CCtx_refPrefix_advanced(
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cctx, dict, dictSize,
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ZSTD_dct_rawContent));
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else
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FUZZ_ZASSERT(ZSTD_CCtx_loadDictionary_advanced(
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cctx, dict, dictSize,
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(ZSTD_dictLoadMethod_e)FUZZ_dataProducer_uint32Range(producer, 0, 1),
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ZSTD_dct_rawContent));
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cSize = ZSTD_compress2(cctx, compressed, compressedCapacity, src, srcSize);
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FUZZ_ZASSERT(cSize);
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if (refPrefix)
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FUZZ_ZASSERT(ZSTD_DCtx_refPrefix_advanced(
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dctx, dict, dictSize,
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dictContentType));
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else
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FUZZ_ZASSERT(ZSTD_DCtx_loadDictionary_advanced(
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dctx, dict, dictSize,
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(ZSTD_dictLoadMethod_e)FUZZ_dataProducer_uint32Range(producer, 0, 1),
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dictContentType));
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{
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size_t const ret = ZSTD_decompressDCtx(
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dctx, result, resultCapacity, compressed, cSize);
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return ret;
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}
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}
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int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
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{
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/* Give a random portion of src data to the producer, to use for
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parameter generation. The rest will be used for (de)compression */
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FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size);
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size = FUZZ_dataProducer_reserveDataPrefix(producer);
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uint8_t const* const srcBuf = src;
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size_t const srcSize = FUZZ_dataProducer_uint32Range(producer, 0, size);
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uint8_t const* const dictBuf = srcBuf + srcSize;
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size_t const dictSize = size - srcSize;
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size_t const decompSize = srcSize;
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void* const decompBuf = FUZZ_malloc(decompSize);
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size_t compSize = ZSTD_compressBound(srcSize);
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void* compBuf;
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/* Half of the time fuzz with a 1 byte smaller output size.
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* This will still succeed because we force the checksum to be disabled,
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* giving us 4 bytes of overhead.
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*/
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compSize -= FUZZ_dataProducer_uint32Range(producer, 0, 1);
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compBuf = FUZZ_malloc(compSize);
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if (!cctx) {
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cctx = ZSTD_createCCtx();
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FUZZ_ASSERT(cctx);
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}
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if (!dctx) {
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dctx = ZSTD_createDCtx();
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FUZZ_ASSERT(dctx);
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}
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{
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size_t const result =
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roundTripTest(decompBuf, decompSize, compBuf, compSize, srcBuf, srcSize, dictBuf, dictSize, producer);
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FUZZ_ZASSERT(result);
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FUZZ_ASSERT_MSG(result == srcSize, "Incorrect regenerated size");
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FUZZ_ASSERT_MSG(!FUZZ_memcmp(src, decompBuf, srcSize), "Corruption!");
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}
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free(decompBuf);
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free(compBuf);
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FUZZ_dataProducer_free(producer);
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#ifndef STATEFUL_FUZZING
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ZSTD_freeCCtx(cctx); cctx = NULL;
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ZSTD_freeDCtx(dctx); dctx = NULL;
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#endif
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return 0;
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}
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