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- // Copyright 2018 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 <stdint.h>
- #include <iostream>
- #include <memory>
- #include "base/environment.h"
- #include "base/logging.h"
- #include "components/zucchini/buffer_sink.h"
- #include "components/zucchini/buffer_view.h"
- #include "components/zucchini/fuzzers/file_pair.pb.h"
- #include "components/zucchini/patch_writer.h"
- #include "components/zucchini/zucchini_gen.h"
- #include "testing/libfuzzer/proto/lpm_interface.h"
- namespace {
- constexpr size_t kMinImageSize = 16;
- constexpr size_t kMaxImageSize = 1024;
- } // namespace
- struct Environment {
- Environment() {
- logging::SetMinLogLevel(logging::LOG_FATAL); // Disable console spamming.
- }
- };
- Environment* env = new Environment();
- DEFINE_BINARY_PROTO_FUZZER(const zucchini::fuzzers::FilePair& file_pair) {
- // Dump code for debugging.
- if (base::Environment::Create()->HasVar("LPM_DUMP_NATIVE_INPUT")) {
- std::cout << "Old File: " << file_pair.old_file() << std::endl
- << "New File: " << file_pair.new_or_patch_file() << std::endl;
- }
- // Prepare data.
- zucchini::ConstBufferView old_image(
- reinterpret_cast<const uint8_t*>(file_pair.old_file().data()),
- file_pair.old_file().size());
- zucchini::ConstBufferView new_image(
- reinterpret_cast<const uint8_t*>(file_pair.new_or_patch_file().data()),
- file_pair.new_or_patch_file().size());
- // Restrict image sizes to speed up fuzzing.
- if (old_image.size() < kMinImageSize || old_image.size() > kMaxImageSize ||
- new_image.size() < kMinImageSize || new_image.size() > kMaxImageSize) {
- return;
- }
- // Generate a patch writer.
- zucchini::EnsemblePatchWriter patch_writer(old_image, new_image);
- // Fuzz Target.
- zucchini::GenerateBufferRaw(old_image, new_image, &patch_writer);
- // Check that the patch size is sane. Crash the fuzzer if this isn't the case
- // as it is a failure in Zucchini's patch performance that is worth
- // investigating.
- size_t patch_size = patch_writer.SerializedSize();
- CHECK_LE(patch_size, kMaxImageSize * 2);
- // Write to buffer to avoid IO.
- std::unique_ptr<uint8_t[]> patch_data(new uint8_t[patch_size]);
- zucchini::BufferSink patch(patch_data.get(), patch_size);
- patch_writer.SerializeInto(patch);
- }
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