1/**
2 * This fuzz target attempts to compress the fuzzed data with the simple
3 * compression function with an output buffer that may be too small to
4 * ensure that the compressor never crashes.
5 */
6
7#include <stddef.h>
8#include <stdint.h>
9#include <stdlib.h>
10#include <string.h>
11
12#include "fuzz_helpers.h"
13#include "lz4.h"
14#include "lz4frame.h"
15#include "lz4_helpers.h"
16#include "fuzz_data_producer.h"
17
18int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
19{
20    FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(data, size);
21    LZ4F_preferences_t const prefs = FUZZ_dataProducer_preferences(producer);
22    size_t const dstCapacitySeed = FUZZ_dataProducer_retrieve32(producer);
23    size = FUZZ_dataProducer_remainingBytes(producer);
24
25    size_t const compressBound = LZ4F_compressFrameBound(size, &prefs);
26    size_t const dstCapacity = FUZZ_getRange_from_uint32(dstCapacitySeed, 0, compressBound);
27
28    char* const dst = (char*)malloc(dstCapacity);
29    char* const rt = (char*)malloc(size);
30
31    FUZZ_ASSERT(dst!=NULL);
32    FUZZ_ASSERT(rt!=NULL);
33
34    /* If compression succeeds it must round trip correctly. */
35    size_t const dstSize =
36            LZ4F_compressFrame(dst, dstCapacity, data, size, &prefs);
37    if (!LZ4F_isError(dstSize)) {
38        size_t const rtSize = FUZZ_decompressFrame(rt, size, dst, dstSize);
39        FUZZ_ASSERT_MSG(rtSize == size, "Incorrect regenerated size");
40        FUZZ_ASSERT_MSG(!memcmp(data, rt, size), "Corruption!");
41    }
42
43    free(dst);
44    free(rt);
45    FUZZ_dataProducer_free(producer);
46
47    return 0;
48}
49