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/*
* Copyright (c) 2017 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 "media/base/fake_rtp.h"
#include <stdint.h>
#include <string.h>
#include "absl/algorithm/container.h"
#include "rtc_base/checks.h"
#include "test/gtest.h"
void CompareHeaderExtensions(const char* packet1,
size_t packet1_size,
const char* packet2,
size_t packet2_size,
const std::vector<int>& encrypted_headers,
bool expect_equal) {
// Sanity check: packets must be large enough to contain the RTP header and
// extensions header.
RTC_CHECK_GE(packet1_size, 12 + 4);
RTC_CHECK_GE(packet2_size, 12 + 4);
// RTP extension headers are the same.
EXPECT_EQ(0, memcmp(packet1 + 12, packet2 + 12, 4));
// Check for one-byte header extensions.
EXPECT_EQ('\xBE', packet1[12]);
EXPECT_EQ('\xDE', packet1[13]);
// Determine position and size of extension headers.
size_t extension_words = packet1[14] << 8 | packet1[15];
const char* extension_data1 = packet1 + 12 + 4;
const char* extension_end1 = extension_data1 + extension_words * 4;
const char* extension_data2 = packet2 + 12 + 4;
// Sanity check: packets must be large enough to contain the RTP header
// extensions.
RTC_CHECK_GE(packet1_size, 12 + 4 + extension_words * 4);
RTC_CHECK_GE(packet2_size, 12 + 4 + extension_words * 4);
while (extension_data1 < extension_end1) {
uint8_t id = (*extension_data1 & 0xf0) >> 4;
uint8_t len = (*extension_data1 & 0x0f) + 1;
extension_data1++;
extension_data2++;
EXPECT_LE(extension_data1, extension_end1);
if (id == 15) {
// Finished parsing.
break;
}
// The header extension doesn't get encrypted if the id is not in the
// list of header extensions to encrypt.
if (expect_equal || !absl::c_linear_search(encrypted_headers, id)) {
EXPECT_EQ(0, memcmp(extension_data1, extension_data2, len));
} else {
EXPECT_NE(0, memcmp(extension_data1, extension_data2, len));
}
extension_data1 += len;
extension_data2 += len;
// Skip padding.
while (extension_data1 < extension_end1 && *extension_data1 == 0) {
extension_data1++;
extension_data2++;
}
}
}