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/**
* This fuzz target performs a lz4 round-trip test (compress & decompress),
* compares the result with the original, and calls abort() on corruption.
*/
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "fuzz_helpers.h"
#include "lz4.h"
#include "fuzz_data_producer.h"
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(data, size);
size_t const partialCapacitySeed = FUZZ_dataProducer_retrieve32(producer);
size = FUZZ_dataProducer_remainingBytes(producer);
size_t const partialCapacity = FUZZ_getRange_from_uint32(partialCapacitySeed, 0, size);
size_t const dstCapacity = LZ4_compressBound(size);
size_t const largeSize = 64 * 1024 - 1;
size_t const smallSize = 1024;
char* const dstPlusLargePrefix = (char*)malloc(dstCapacity + largeSize);
char* const dstPlusSmallPrefix = dstPlusLargePrefix + largeSize - smallSize;
char* const largeDict = (char*)malloc(largeSize);
char* const smallDict = largeDict + largeSize - smallSize;
char* const dst = dstPlusLargePrefix + largeSize;
char* const rt = (char*)malloc(size);
FUZZ_ASSERT(dst);
FUZZ_ASSERT(rt);
/* Compression must succeed and round trip correctly. */
int const dstSize = LZ4_compress_default((const char*)data, dst,
size, dstCapacity);
FUZZ_ASSERT(dstSize > 0);
int const rtSize = LZ4_decompress_safe(dst, rt, dstSize, size);
FUZZ_ASSERT_MSG(rtSize == size, "Incorrect size");
FUZZ_ASSERT_MSG(!memcmp(data, rt, size), "Corruption!");
/* Partial decompression must succeed. */
{
char* const partial = (char*)malloc(partialCapacity);
FUZZ_ASSERT(partial);
int const partialSize = LZ4_decompress_safe_partial(
dst, partial, dstSize, partialCapacity, partialCapacity);
FUZZ_ASSERT(partialSize >= 0);
FUZZ_ASSERT_MSG(partialSize == partialCapacity, "Incorrect size");
FUZZ_ASSERT_MSG(!memcmp(data, partial, partialSize), "Corruption!");
free(partial);
}
/* Partial decompression using dict with no dict. */
{
char* const partial = (char*)malloc(partialCapacity);
FUZZ_ASSERT(partial);
int const partialSize = LZ4_decompress_safe_partial_usingDict(
dst, partial, dstSize, partialCapacity, partialCapacity, NULL, 0);
FUZZ_ASSERT(partialSize >= 0);
FUZZ_ASSERT_MSG(partialSize == partialCapacity, "Incorrect size");
FUZZ_ASSERT_MSG(!memcmp(data, partial, partialSize), "Corruption!");
free(partial);
}
/* Partial decompression using dict with small prefix as dict */
{
char* const partial = (char*)malloc(partialCapacity);
FUZZ_ASSERT(partial);
int const partialSize = LZ4_decompress_safe_partial_usingDict(
dst, partial, dstSize, partialCapacity, partialCapacity, dstPlusSmallPrefix, smallSize);
FUZZ_ASSERT(partialSize >= 0);
FUZZ_ASSERT_MSG(partialSize == partialCapacity, "Incorrect size");
FUZZ_ASSERT_MSG(!memcmp(data, partial, partialSize), "Corruption!");
free(partial);
}
/* Partial decompression using dict with large prefix as dict */
{
char* const partial = (char*)malloc(partialCapacity);
FUZZ_ASSERT(partial);
int const partialSize = LZ4_decompress_safe_partial_usingDict(
dst, partial, dstSize, partialCapacity, partialCapacity, dstPlusLargePrefix, largeSize);
FUZZ_ASSERT(partialSize >= 0);
FUZZ_ASSERT_MSG(partialSize == partialCapacity, "Incorrect size");
FUZZ_ASSERT_MSG(!memcmp(data, partial, partialSize), "Corruption!");
free(partial);
}
/* Partial decompression using dict with small external dict */
{
char* const partial = (char*)malloc(partialCapacity);
FUZZ_ASSERT(partial);
int const partialSize = LZ4_decompress_safe_partial_usingDict(
dst, partial, dstSize, partialCapacity, partialCapacity, smallDict, smallSize);
FUZZ_ASSERT(partialSize >= 0);
FUZZ_ASSERT_MSG(partialSize == partialCapacity, "Incorrect size");
FUZZ_ASSERT_MSG(!memcmp(data, partial, partialSize), "Corruption!");
free(partial);
}
/* Partial decompression using dict with large external dict */
{
char* const partial = (char*)malloc(partialCapacity);
FUZZ_ASSERT(partial);
int const partialSize = LZ4_decompress_safe_partial_usingDict(
dst, partial, dstSize, partialCapacity, partialCapacity, largeDict, largeSize);
FUZZ_ASSERT(partialSize >= 0);
FUZZ_ASSERT_MSG(partialSize == partialCapacity, "Incorrect size");
FUZZ_ASSERT_MSG(!memcmp(data, partial, partialSize), "Corruption!");
free(partial);
}
free(dst);
free(rt);
FUZZ_dataProducer_free(producer);
return 0;
}
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