72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
/*
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* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "media/base/fake_rtp.h"
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#include <stdint.h>
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#include <string.h>
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#include "absl/algorithm/container.h"
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#include "rtc_base/checks.h"
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#include "test/gtest.h"
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void CompareHeaderExtensions(const char* packet1,
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size_t packet1_size,
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const char* packet2,
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size_t packet2_size,
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const std::vector<int> encrypted_headers,
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bool expect_equal) {
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// Sanity check: packets must be large enough to contain the RTP header and
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// extensions header.
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RTC_CHECK_GE(packet1_size, 12 + 4);
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RTC_CHECK_GE(packet2_size, 12 + 4);
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// RTP extension headers are the same.
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EXPECT_EQ(0, memcmp(packet1 + 12, packet2 + 12, 4));
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// Check for one-byte header extensions.
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EXPECT_EQ('\xBE', packet1[12]);
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EXPECT_EQ('\xDE', packet1[13]);
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// Determine position and size of extension headers.
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size_t extension_words = packet1[14] << 8 | packet1[15];
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const char* extension_data1 = packet1 + 12 + 4;
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const char* extension_end1 = extension_data1 + extension_words * 4;
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const char* extension_data2 = packet2 + 12 + 4;
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// Sanity check: packets must be large enough to contain the RTP header
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// extensions.
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RTC_CHECK_GE(packet1_size, 12 + 4 + extension_words * 4);
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RTC_CHECK_GE(packet2_size, 12 + 4 + extension_words * 4);
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while (extension_data1 < extension_end1) {
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uint8_t id = (*extension_data1 & 0xf0) >> 4;
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uint8_t len = (*extension_data1 & 0x0f) + 1;
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extension_data1++;
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extension_data2++;
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EXPECT_LE(extension_data1, extension_end1);
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if (id == 15) {
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// Finished parsing.
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break;
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}
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// The header extension doesn't get encrypted if the id is not in the
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// list of header extensions to encrypt.
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if (expect_equal || !absl::c_linear_search(encrypted_headers, id)) {
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EXPECT_EQ(0, memcmp(extension_data1, extension_data2, len));
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} else {
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EXPECT_NE(0, memcmp(extension_data1, extension_data2, len));
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}
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extension_data1 += len;
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extension_data2 += len;
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// Skip padding.
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while (extension_data1 < extension_end1 && *extension_data1 == 0) {
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extension_data1++;
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extension_data2++;
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}
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}
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}
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