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// Copyright 2020 The libgav1 Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <cstddef>
#include <cstdint>
#include <deque>
#include <memory>
#include <vector>
#include "examples/file_reader.h"
#include "examples/file_reader_constants.h"
#include "examples/file_reader_interface.h"
#include "src/gav1/decoder.h"
#include "src/gav1/status_code.h"
#include "tests/fuzzer/fuzzer_temp_file.h"
namespace {
#if defined(LIBGAV1_EXHAUSTIVE_FUZZING)
// Set a large upper bound to give more coverage of a single input; this value
// should be larger than most of the frame counts in the corpus.
constexpr size_t kMaxDataSize = 400 * 1024;
#else
constexpr size_t kMaxDataSize = 200 * 1024;
#endif
using InputBuffer = std::vector<uint8_t>;
struct InputBuffers {
~InputBuffers() {
for (auto& buffer : free_buffers) {
delete buffer;
}
}
std::deque<InputBuffer*> free_buffers;
};
void ReleaseInputBuffer(void* callback_private_data,
void* buffer_private_data) {
auto* const test = static_cast<InputBuffers*>(callback_private_data);
test->free_buffers.push_back(static_cast<InputBuffer*>(buffer_private_data));
}
} // namespace
// Always returns 0. Nonzero return values are reserved by libFuzzer for future
// use.
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
// Reject large chunks of data to improve fuzzer throughput.
if (size > kMaxDataSize) return 0;
// Note that |input_buffers| has to outlive the |decoder| object since the
// |release_input_buffer| callback could be called on the |decoder|'s
// destructor.
InputBuffers input_buffers;
libgav1::Decoder decoder;
libgav1::DecoderSettings settings = {};
// Use the 33 + low byte of the width to seed the number of threads. This
// ensures that we will trigger the frame parallel path in most cases.
// We use both nibbles of the lower byte as this results in values != 1 much
// more quickly than using the lower nibble alone.
settings.threads =
33 + ((size >= 13) ? ((data[12] >> 4 | data[12]) & 0xF) + 1 : 1);
settings.frame_parallel = true;
settings.blocking_dequeue = true;
settings.callback_private_data = &input_buffers;
settings.release_input_buffer = ReleaseInputBuffer;
if (decoder.Init(&settings) != libgav1::kStatusOk) return 0;
FuzzerTemporaryFile tempfile(data, size);
auto file_reader =
libgav1::FileReader::Open(tempfile.filename(), /*error_tolerant=*/true);
if (file_reader == nullptr) return 0;
InputBuffer* input_buffer = nullptr;
bool dequeue_finished = false;
do {
if (input_buffer == nullptr && !file_reader->IsEndOfFile()) {
if (input_buffers.free_buffers.empty()) {
auto* const buffer = new (std::nothrow) InputBuffer();
if (buffer == nullptr) {
break;
}
input_buffers.free_buffers.push_back(buffer);
}
input_buffer = input_buffers.free_buffers.front();
input_buffers.free_buffers.pop_front();
if (!file_reader->ReadTemporalUnit(input_buffer, nullptr)) {
break;
}
}
if (input_buffer != nullptr) {
libgav1::StatusCode status =
decoder.EnqueueFrame(input_buffer->data(), input_buffer->size(),
/*user_private_data=*/0,
/*buffer_private_data=*/input_buffer);
if (status == libgav1::kStatusOk) {
input_buffer = nullptr;
// Continue to enqueue frames until we get a kStatusTryAgain status.
continue;
}
if (status != libgav1::kStatusTryAgain) {
break;
}
}
const libgav1::DecoderBuffer* buffer;
libgav1::StatusCode status = decoder.DequeueFrame(&buffer);
if (status == libgav1::kStatusNothingToDequeue) {
dequeue_finished = true;
} else if (status == libgav1::kStatusOk) {
dequeue_finished = false;
} else {
break;
}
} while (input_buffer != nullptr || !file_reader->IsEndOfFile() ||
!dequeue_finished);
if (input_buffer != nullptr) {
input_buffers.free_buffers.push_back(input_buffer);
}
return 0;
}
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