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Issue 2748323002: Pickup github update for brotli fuzz target. (Closed)
Patch Set: Move fuzzer to brotli/fuzz Created 3 years, 9 months ago
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1 // Copyright 2015 The Chromium Authors. All rights reserved. 1 // Copyright 2015 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #include <stddef.h> 5 #include <stddef.h>
6 #include <stdint.h> 6 #include <stdint.h>
7 7
8 #include "third_party/brotli/include/brotli/decode.h" 8 #include <brotli/decode.h>
9 9
10 // Entry point for LibFuzzer. 10 // Entry point for LibFuzzer.
11 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) { 11 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
12 size_t addend = 0; 12 size_t addend = 0;
13 if (size > 0) 13 if (size > 0)
14 addend = data[size - 1] & 7; 14 addend = data[size - 1] & 7;
15 const uint8_t* next_in = data; 15 const uint8_t* next_in = data;
16 16
17 const int kBufferSize = 1024; 17 const int kBufferSize = 1024;
18 uint8_t* buffer = new uint8_t[kBufferSize]; 18 uint8_t* buffer = new uint8_t[kBufferSize];
19 /* The biggest "magic number" in brotli is 16MiB - 16, so no need to check
20 the cases with much longer output. */
21 const size_t total_out_limit = (addend == 0) ? (1 << 26) : (1 << 24);
22 size_t total_out = 0;
23
19 BrotliDecoderState* state = BrotliDecoderCreateInstance(0, 0, 0); 24 BrotliDecoderState* state = BrotliDecoderCreateInstance(0, 0, 0);
20 25
21 if (addend == 0) 26 if (addend == 0)
22 addend = size; 27 addend = size;
23 /* Test both fast (addend == size) and slow (addend <= 7) decoding paths. */ 28 /* Test both fast (addend == size) and slow (addend <= 7) decoding paths. */
24 for (size_t i = 0; i < size;) { 29 for (size_t i = 0; i < size;) {
25 size_t next_i = i + addend; 30 size_t next_i = i + addend;
26 if (next_i > size) 31 if (next_i > size)
27 next_i = size; 32 next_i = size;
28 size_t avail_in = next_i - i; 33 size_t avail_in = next_i - i;
29 i = next_i; 34 i = next_i;
30 BrotliDecoderResult result = BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT; 35 BrotliDecoderResult result = BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT;
31 while (result == BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT) { 36 while (result == BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT) {
32 size_t avail_out = kBufferSize; 37 size_t avail_out = kBufferSize;
33 uint8_t* next_out = buffer; 38 uint8_t* next_out = buffer;
34 size_t total_out;
35 result = BrotliDecoderDecompressStream( 39 result = BrotliDecoderDecompressStream(
36 state, &avail_in, &next_in, &avail_out, &next_out, &total_out); 40 state, &avail_in, &next_in, &avail_out, &next_out, &total_out);
41 if (total_out > total_out_limit)
42 break;
37 } 43 }
44 if (total_out > total_out_limit)
45 break;
38 if (result != BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT) 46 if (result != BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT)
39 break; 47 break;
40 } 48 }
41 49
42 BrotliDecoderDestroyInstance(state); 50 BrotliDecoderDestroyInstance(state);
43 delete[] buffer; 51 delete[] buffer;
44 return 0; 52 return 0;
45 } 53 }
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