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/*
* Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <memory>
#include <utility>
#include "api/array_view.h"
#include "common_video/generic_frame_descriptor/generic_frame_info.h"
#include "modules/rtp_rtcp/source/rtp_dependency_descriptor_extension.h"
#include "rtc_base/checks.h"
#include "test/fuzzers/fuzz_data_helper.h"
namespace webrtc {
void FuzzOneInput(const uint8_t* data, size_t size) {
FrameDependencyStructure structure1;
// nullptr during 1st while loop, after that should point to structure1.
const FrameDependencyStructure* structure1_ptr = nullptr;
std::unique_ptr<const FrameDependencyStructure> structure2;
test::FuzzDataHelper fuzz_data(rtc::MakeArrayView(data, size));
while (fuzz_data.CanReadBytes(1)) {
// Treat next byte as size of the next extension. That aligns how
// two-byte rtp header extension sizes are written.
size_t next_size = fuzz_data.Read<uint8_t>();
auto raw =
fuzz_data.ReadByteArray(std::min(next_size, fuzz_data.BytesLeft()));
// Read the random input.
DependencyDescriptor descriptor1;
if (!RtpDependencyDescriptorExtension::Parse(raw, structure1_ptr,
&descriptor1)) {
// Ignore invalid buffer and move on.
continue;
}
if (descriptor1.attached_structure) {
structure1 = *descriptor1.attached_structure;
structure1_ptr = &structure1;
}
RTC_CHECK(structure1_ptr);
// Write parsed descriptor back into raw buffer.
size_t value_size =
RtpDependencyDescriptorExtension::ValueSize(structure1, descriptor1);
// Check `writer` use minimal number of bytes to pack the descriptor by
// checking it doesn't use more than reader consumed.
RTC_CHECK_LE(value_size, raw.size());
uint8_t some_memory[256];
// That should be true because value_size <= next_size < 256
RTC_CHECK_LT(value_size, 256);
rtc::ArrayView<uint8_t> write_buffer(some_memory, value_size);
RTC_CHECK(RtpDependencyDescriptorExtension::Write(write_buffer, structure1,
descriptor1));
// Parse what Write assembled.
// Unlike random input that should always succeed.
DependencyDescriptor descriptor2;
RTC_CHECK(RtpDependencyDescriptorExtension::Parse(
write_buffer, structure2.get(), &descriptor2));
// Check descriptor1 and descriptor2 have same values.
RTC_CHECK_EQ(descriptor1.first_packet_in_frame,
descriptor2.first_packet_in_frame);
RTC_CHECK_EQ(descriptor1.last_packet_in_frame,
descriptor2.last_packet_in_frame);
RTC_CHECK_EQ(descriptor1.attached_structure != nullptr,
descriptor2.attached_structure != nullptr);
// Using value_or would miss invalid corner case when one value is nullopt
// while another one is 0, but for other errors would produce much nicer
// error message than using RTC_CHECK(optional1 == optional2);
// If logger would support pretty printing optional values, value_or can be
// removed.
RTC_CHECK_EQ(descriptor1.active_decode_targets_bitmask.value_or(0),
descriptor2.active_decode_targets_bitmask.value_or(0));
RTC_CHECK_EQ(descriptor1.frame_number, descriptor2.frame_number);
RTC_CHECK(descriptor1.resolution == descriptor2.resolution);
RTC_CHECK(descriptor1.frame_dependencies == descriptor2.frame_dependencies);
if (descriptor2.attached_structure) {
structure2 = std::move(descriptor2.attached_structure);
}
}
}
} // namespace webrtc
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