blob: c00e71551d80db98bdddd75083814ec3e278067a [file] [log] [blame]
// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <fuzzer/FuzzedDataProvider.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <vector>
#include "third_party/zlib/zlib.h"
// Fuzzer builds often have NDEBUG set, so roll our own assert macro.
#define ASSERT(cond) \
do { \
if (!(cond)) { \
fprintf(stderr, "%s:%d Assert failed: %s\n", __FILE__, __LINE__, #cond); \
exit(1); \
} \
} while (0)
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
FuzzedDataProvider fdp(data, size);
int level = fdp.PickValueInArray({0, 1, 2, 3, 4, 5, 6, 7, 8, 9});
int windowBits = fdp.PickValueInArray({9, 10, 11, 12, 13, 14, 15});
int memLevel = fdp.PickValueInArray({1, 2, 3, 4, 5, 6, 7, 8, 9});
int strategy = fdp.PickValueInArray(
{Z_DEFAULT_STRATEGY, Z_FILTERED, Z_HUFFMAN_ONLY, Z_RLE, Z_FIXED});
std::vector<uint8_t> src = fdp.ConsumeRemainingBytes<uint8_t>();
z_stream stream;
stream.zalloc = Z_NULL;
stream.zfree = Z_NULL;
// Compress the data one byte at a time to exercise the streaming code.
int ret =
deflateInit2(&stream, level, Z_DEFLATED, windowBits, memLevel, strategy);
ASSERT(ret == Z_OK);
std::vector<uint8_t> compressed(src.size() * 2 + 1000);
stream.next_out = compressed.data();
stream.avail_out = compressed.size();
for (uint8_t b : src) {
stream.next_in = &b;
stream.avail_in = 1;
ret = deflate(&stream, Z_NO_FLUSH);
ASSERT(ret == Z_OK);
}
stream.next_in = Z_NULL;
stream.avail_in = 0;
ret = deflate(&stream, Z_FINISH);
ASSERT(ret == Z_STREAM_END);
compressed.resize(compressed.size() - stream.avail_out);
deflateEnd(&stream);
// Verify that the data decompresses correctly.
ret = inflateInit2(&stream, windowBits);
ASSERT(ret == Z_OK);
// Make room for at least one byte so it's never empty.
std::vector<uint8_t> decompressed(src.size() + 1);
stream.next_in = compressed.data();
stream.avail_in = compressed.size();
stream.next_out = decompressed.data();
stream.avail_out = decompressed.size();
ret = inflate(&stream, Z_FINISH);
ASSERT(ret == Z_STREAM_END);
decompressed.resize(decompressed.size() - stream.avail_out);
inflateEnd(&stream);
ASSERT(decompressed == src);
return 0;
}