648db22b |
1 | /* |
2 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
3 | * All rights reserved. |
4 | * |
5 | * This source code is licensed under both the BSD-style license (found in the |
6 | * LICENSE file in the root directory of this source tree) and the GPLv2 (found |
7 | * in the COPYING file in the root directory of this source tree). |
8 | * You may select, at your option, one of the above-listed licenses. |
9 | */ |
10 | |
11 | #include "zstd.h" |
12 | #include "zstd_seekable.h" |
13 | #include "fuzz_helpers.h" |
14 | #include "fuzz_data_producer.h" |
15 | |
16 | static ZSTD_seekable *stream = NULL; |
17 | static ZSTD_seekable_CStream *zscs = NULL; |
18 | static const size_t kSeekableOverheadSize = ZSTD_seekTableFooterSize; |
19 | |
20 | int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size) |
21 | { |
22 | /* Give a random portion of src data to the producer, to use for |
23 | parameter generation. The rest will be used for (de)compression */ |
24 | FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size); |
25 | size = FUZZ_dataProducer_reserveDataPrefix(producer); |
26 | size_t const compressedBufferSize = ZSTD_compressBound(size) + kSeekableOverheadSize; |
27 | uint8_t* compressedBuffer = (uint8_t*)malloc(compressedBufferSize); |
28 | uint8_t* decompressedBuffer = (uint8_t*)malloc(size); |
29 | |
30 | int const cLevel = FUZZ_dataProducer_int32Range(producer, ZSTD_minCLevel(), ZSTD_maxCLevel()); |
31 | unsigned const checksumFlag = FUZZ_dataProducer_int32Range(producer, 0, 1); |
32 | size_t const uncompressedSize = FUZZ_dataProducer_uint32Range(producer, 0, size); |
33 | size_t const offset = FUZZ_dataProducer_uint32Range(producer, 0, size - uncompressedSize); |
34 | size_t seekSize; |
35 | |
36 | if (!zscs) { |
37 | zscs = ZSTD_seekable_createCStream(); |
38 | FUZZ_ASSERT(zscs); |
39 | } |
40 | if (!stream) { |
41 | stream = ZSTD_seekable_create(); |
42 | FUZZ_ASSERT(stream); |
43 | } |
44 | |
45 | { /* Perform a compression */ |
46 | size_t const initStatus = ZSTD_seekable_initCStream(zscs, cLevel, checksumFlag, size); |
47 | size_t endStatus; |
48 | ZSTD_outBuffer out = { .dst=compressedBuffer, .pos=0, .size=compressedBufferSize }; |
49 | ZSTD_inBuffer in = { .src=src, .pos=0, .size=size }; |
50 | FUZZ_ASSERT(!ZSTD_isError(initStatus)); |
51 | |
52 | do { |
53 | size_t cSize = ZSTD_seekable_compressStream(zscs, &out, &in); |
54 | FUZZ_ASSERT(!ZSTD_isError(cSize)); |
55 | } while (in.pos != in.size); |
56 | |
57 | FUZZ_ASSERT(in.pos == in.size); |
58 | endStatus = ZSTD_seekable_endStream(zscs, &out); |
59 | FUZZ_ASSERT(!ZSTD_isError(endStatus)); |
60 | seekSize = out.pos; |
61 | } |
62 | |
63 | { /* Decompress at an offset */ |
64 | size_t const initStatus = ZSTD_seekable_initBuff(stream, compressedBuffer, seekSize); |
65 | size_t decompressedBytesTotal = 0; |
66 | size_t dSize; |
67 | |
68 | FUZZ_ZASSERT(initStatus); |
69 | do { |
70 | dSize = ZSTD_seekable_decompress(stream, decompressedBuffer, uncompressedSize, offset); |
71 | FUZZ_ASSERT(!ZSTD_isError(dSize)); |
72 | decompressedBytesTotal += dSize; |
73 | } while (decompressedBytesTotal < uncompressedSize && dSize > 0); |
74 | FUZZ_ASSERT(decompressedBytesTotal == uncompressedSize); |
75 | } |
76 | |
77 | FUZZ_ASSERT_MSG(!FUZZ_memcmp(src+offset, decompressedBuffer, uncompressedSize), "Corruption!"); |
78 | |
79 | free(decompressedBuffer); |
80 | free(compressedBuffer); |
81 | FUZZ_dataProducer_free(producer); |
82 | |
83 | #ifndef STATEFUL_FUZZING |
84 | ZSTD_seekable_free(stream); stream = NULL; |
85 | ZSTD_seekable_freeCStream(zscs); zscs = NULL; |
86 | #endif |
87 | return 0; |
88 | } |