1 /*
2 * Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include <algorithm>
12 #include <cstddef>
13 #include <cstdint>
14 #include <memory>
15 #include <utility>
16
17 #include "api/array_view.h"
18 #include "common_video/generic_frame_descriptor/generic_frame_info.h"
19 #include "modules/rtp_rtcp/source/rtp_dependency_descriptor_extension.h"
20 #include "rtc_base/checks.h"
21 #include "test/fuzzers/fuzz_data_helper.h"
22
23 namespace webrtc {
24
FuzzOneInput(const uint8_t * data,size_t size)25 void FuzzOneInput(const uint8_t* data, size_t size) {
26 FrameDependencyStructure structure1;
27 // nullptr during 1st while loop, after that should point to structure1.
28 const FrameDependencyStructure* structure1_ptr = nullptr;
29 std::unique_ptr<const FrameDependencyStructure> structure2;
30
31 test::FuzzDataHelper fuzz_data(rtc::MakeArrayView(data, size));
32 while (fuzz_data.CanReadBytes(1)) {
33 // Treat next byte as size of the next extension. That aligns how
34 // two-byte rtp header extension sizes are written.
35 size_t next_size = fuzz_data.Read<uint8_t>();
36 auto raw =
37 fuzz_data.ReadByteArray(std::min(next_size, fuzz_data.BytesLeft()));
38
39 // Read the random input.
40 DependencyDescriptor descriptor1;
41 if (!RtpDependencyDescriptorExtension::Parse(raw, structure1_ptr,
42 &descriptor1)) {
43 // Ignore invalid buffer and move on.
44 continue;
45 }
46 if (descriptor1.attached_structure) {
47 structure1 = *descriptor1.attached_structure;
48 structure1_ptr = &structure1;
49 }
50 RTC_CHECK(structure1_ptr);
51
52 // Write parsed descriptor back into raw buffer.
53 size_t value_size =
54 RtpDependencyDescriptorExtension::ValueSize(structure1, descriptor1);
55 // Check `writer` use minimal number of bytes to pack the descriptor by
56 // checking it doesn't use more than reader consumed.
57 RTC_CHECK_LE(value_size, raw.size());
58 uint8_t some_memory[256];
59 // That should be true because value_size <= next_size < 256
60 RTC_CHECK_LT(value_size, 256);
61 rtc::ArrayView<uint8_t> write_buffer(some_memory, value_size);
62 RTC_CHECK(RtpDependencyDescriptorExtension::Write(write_buffer, structure1,
63 descriptor1));
64
65 // Parse what Write assembled.
66 // Unlike random input that should always succeed.
67 DependencyDescriptor descriptor2;
68 RTC_CHECK(RtpDependencyDescriptorExtension::Parse(
69 write_buffer, structure2.get(), &descriptor2));
70 // Check descriptor1 and descriptor2 have same values.
71 RTC_CHECK_EQ(descriptor1.first_packet_in_frame,
72 descriptor2.first_packet_in_frame);
73 RTC_CHECK_EQ(descriptor1.last_packet_in_frame,
74 descriptor2.last_packet_in_frame);
75 RTC_CHECK_EQ(descriptor1.attached_structure != nullptr,
76 descriptor2.attached_structure != nullptr);
77 // Using value_or would miss invalid corner case when one value is nullopt
78 // while another one is 0, but for other errors would produce much nicer
79 // error message than using RTC_CHECK(optional1 == optional2);
80 // If logger would support pretty printing optional values, value_or can be
81 // removed.
82 RTC_CHECK_EQ(descriptor1.active_decode_targets_bitmask.value_or(0),
83 descriptor2.active_decode_targets_bitmask.value_or(0));
84 RTC_CHECK_EQ(descriptor1.frame_number, descriptor2.frame_number);
85 RTC_CHECK(descriptor1.resolution == descriptor2.resolution);
86 RTC_CHECK(descriptor1.frame_dependencies == descriptor2.frame_dependencies);
87
88 if (descriptor2.attached_structure) {
89 structure2 = std::move(descriptor2.attached_structure);
90 }
91 }
92 }
93
94 } // namespace webrtc
95