[rtp_rtcp] rtcp::Sdes cleaned and got Parse function

webrtc/modules/rtp_rtcp/source/rtcp_packet/sdes_unittest.cc

 /*
  *  Copyright (c) 2016 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 "webrtc/modules/rtp_rtcp/source/rtcp_packet/sdes.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
-#include "webrtc/modules/rtp_rtcp/source/byte_io.h"
-#include "webrtc/test/rtcp_packet_parser.h"
-
 using webrtc::rtcp::RawPacket;
 using webrtc::rtcp::Sdes;
-using webrtc::test::RtcpPacketParser;
+using webrtc::RTCPUtility::RtcpCommonHeader;
+using webrtc::RTCPUtility::RtcpParseCommonHeader;
 
 namespace webrtc {
+namespace {
 const uint32_t kSenderSsrc = 0x12345678;
+const uint8_t kPadding = 0;
+const uint8_t kTerminatorTag = 0;
+const uint8_t kCnameTag = 1;
+const uint8_t kNameTag = 2;
+const uint8_t kEmailTag = 3;
+
+bool Parse(const uint8_t* buffer, size_t length, Sdes* sdes) {
+  RtcpCommonHeader header;
+  EXPECT_TRUE(RtcpParseCommonHeader(buffer, length, &header));
+  // Check that there is exactly one RTCP packet in the buffer.
+  EXPECT_EQ(length, header.BlockSize());
+  return sdes->Parse(header, buffer + RtcpCommonHeader::kHeaderSizeBytes);
+}
+}  // namespace
+
+TEST(RtcpPacketSdesTest, WithoutChunks) {
+  Sdes sdes;
+
+  rtc::scoped_ptr<RawPacket> packet = sdes.Build();
+  Sdes parsed;
+  EXPECT_TRUE(Parse(packet->Buffer(), packet->Length(), &parsed));
+
+  EXPECT_EQ(0u, parsed.chunks().size());
+}
 
 TEST(RtcpPacketSdesTest, WithOneChunk) {
+  const std::string kCname = "alice@host";
+
   Sdes sdes;
-  EXPECT_TRUE(sdes.WithCName(kSenderSsrc, "alice@host"));
+  EXPECT_TRUE(sdes.WithCName(kSenderSsrc, kCname));
 
-  rtc::scoped_ptr<RawPacket> packet(sdes.Build());
-  RtcpPacketParser parser;
-  parser.Parse(packet->Buffer(), packet->Length());
-  EXPECT_EQ(1, parser.sdes()->num_packets());
-  EXPECT_EQ(1, parser.sdes_chunk()->num_packets());
-  EXPECT_EQ(kSenderSsrc, parser.sdes_chunk()->Ssrc());
-  EXPECT_EQ("alice@host", parser.sdes_chunk()->Cname());
+  rtc::scoped_ptr<RawPacket> packet = sdes.Build();
+  Sdes sdes_parsed;
+  Parse(packet->Buffer(), packet->Length(), &sdes_parsed);
+  const Sdes& parsed = sdes_parsed;  // Ensure accessors are const.
+
+  EXPECT_EQ(1u, parsed.chunks().size());
+  EXPECT_EQ(kSenderSsrc, parsed.chunks()[0].ssrc);
+  EXPECT_EQ(kCname, parsed.chunks()[0].cname);
 }
 
 TEST(RtcpPacketSdesTest, WithMultipleChunks) {
   Sdes sdes;
-  EXPECT_TRUE(sdes.WithCName(kSenderSsrc, "a"));
+  EXPECT_TRUE(sdes.WithCName(kSenderSsrc + 0, "a"));
   EXPECT_TRUE(sdes.WithCName(kSenderSsrc + 1, "ab"));
   EXPECT_TRUE(sdes.WithCName(kSenderSsrc + 2, "abc"));
   EXPECT_TRUE(sdes.WithCName(kSenderSsrc + 3, "abcd"));
   EXPECT_TRUE(sdes.WithCName(kSenderSsrc + 4, "abcde"));
   EXPECT_TRUE(sdes.WithCName(kSenderSsrc + 5, "abcdef"));
 
-  rtc::scoped_ptr<RawPacket> packet(sdes.Build());
-  RtcpPacketParser parser;
-  parser.Parse(packet->Buffer(), packet->Length());
-  EXPECT_EQ(1, parser.sdes()->num_packets());
-  EXPECT_EQ(6, parser.sdes_chunk()->num_packets());
-  EXPECT_EQ(kSenderSsrc + 5, parser.sdes_chunk()->Ssrc());
-  EXPECT_EQ("abcdef", parser.sdes_chunk()->Cname());
+  rtc::scoped_ptr<RawPacket> packet = sdes.Build();
+  Sdes parsed;
+  Parse(packet->Buffer(), packet->Length(), &parsed);
+
+  EXPECT_EQ(6u, parsed.chunks().size());
+  EXPECT_EQ(kSenderSsrc + 5, parsed.chunks()[5].ssrc);
+  EXPECT_EQ("abcdef", parsed.chunks()[5].cname);
 }
 
 TEST(RtcpPacketSdesTest, WithTooManyChunks) {
+  const size_t kMaxChunks = (1 << 5) - 1;
   Sdes sdes;
-  const int kMaxChunks = (1 << 5) - 1;
-  for (int i = 0; i < kMaxChunks; ++i) {
+  for (size_t i = 0; i < kMaxChunks; ++i) {
     uint32_t ssrc = kSenderSsrc + i;
     std::ostringstream oss;
     oss << "cname" << i;
     EXPECT_TRUE(sdes.WithCName(ssrc, oss.str()));
   }
   EXPECT_FALSE(sdes.WithCName(kSenderSsrc + kMaxChunks, "foo"));
 }
 
 TEST(RtcpPacketSdesTest, CnameItemWithEmptyString) {
   Sdes sdes;
   EXPECT_TRUE(sdes.WithCName(kSenderSsrc, ""));
 
-  rtc::scoped_ptr<RawPacket> packet(sdes.Build());
-  RtcpPacketParser parser;
-  parser.Parse(packet->Buffer(), packet->Length());
-  EXPECT_EQ(1, parser.sdes()->num_packets());
-  EXPECT_EQ(1, parser.sdes_chunk()->num_packets());
-  EXPECT_EQ(kSenderSsrc, parser.sdes_chunk()->Ssrc());
-  EXPECT_EQ("", parser.sdes_chunk()->Cname());
+  rtc::scoped_ptr<RawPacket> packet = sdes.Build();
+  Sdes parsed;
+  Parse(packet->Buffer(), packet->Length(), &parsed);
+
+  EXPECT_EQ(1u, parsed.chunks().size());
+  EXPECT_EQ(kSenderSsrc, parsed.chunks()[0].ssrc);
+  EXPECT_EQ("", parsed.chunks()[0].cname);
 }
 
+TEST(RtcpPacketSdesTest, ParseSkipsNonCNameField) {
+  const char kName[] = "abc";
+  const std::string kCname = "de";
+  const uint8_t kValidPacket[] = {0x81,  202, 0x00, 0x04,
+                                  0x12, 0x34, 0x56, 0x78,
+                                  kNameTag,  3, kName[0],  kName[1], kName[2],
+                                  kCnameTag, 2, kCname[0], kCname[1],
+                                  kTerminatorTag, kPadding, kPadding};
+  // Sanity checks packet was assembled correctly.
+  ASSERT_EQ(0u, sizeof(kValidPacket) % 4);
+  ASSERT_EQ(kValidPacket[3] + 1u, sizeof(kValidPacket) / 4);
+
+  Sdes parsed;
+  EXPECT_TRUE(Parse(kValidPacket, sizeof(kValidPacket), &parsed));
+
+  EXPECT_EQ(1u, parsed.chunks().size());
+  EXPECT_EQ(kSenderSsrc, parsed.chunks()[0].ssrc);
+  EXPECT_EQ(kCname, parsed.chunks()[0].cname);
+}
+
+TEST(RtcpPacketSdesTest, ParseSkipsChunksWithoutCName) {
+  const char kName[] = "ab";
+  const char kEmail[] = "de";
+  const std::string kCname = "def";
+  const uint8_t kPacket[] = {0x82,  202, 0x00, 0x07,
+      0x12, 0x34, 0x56, 0x78,  // 1st chunk.
+      kNameTag,  3, kName[0],  kName[1], kName[2],
+      kEmailTag, 2, kEmail[0], kEmail[1],
+      kTerminatorTag, kPadding, kPadding,
+      0x23, 0x45, 0x67, 0x89,  // 2nd chunk.
+      kCnameTag, 3, kCname[0], kCname[1], kCname[2],
+      kTerminatorTag, kPadding, kPadding};
+  // Sanity checks packet was assembled correctly.
+  ASSERT_EQ(0u, sizeof(kPacket) % 4);
+  ASSERT_EQ(kPacket[3] + 1u, sizeof(kPacket) / 4);
+
+  Sdes parsed;
+  EXPECT_TRUE(Parse(kPacket, sizeof(kPacket), &parsed));
+  ASSERT_EQ(1u, parsed.chunks().size());
+  EXPECT_EQ(0x23456789u, parsed.chunks()[0].ssrc);
+  EXPECT_EQ(kCname, parsed.chunks()[0].cname);
+}
+
+TEST(RtcpPacketSdesTest, ParseFailsWithoutChunkItemTerminator) {
+  const char kName[] = "abc";
+  const char kCname[] = "d";
+  // No place for next chunk item.
+  const uint8_t kInvalidPacket[] = {0x81,  202, 0x00, 0x03,
+                                    0x12, 0x34, 0x56, 0x78,
+                                    kNameTag,  3, kName[0], kName[1], kName[2],
+                                    kCnameTag, 1, kCname[0]};
+  // Sanity checks packet was assembled correctly.
+  ASSERT_EQ(0u, sizeof(kInvalidPacket) % 4);
+  ASSERT_EQ(kInvalidPacket[3] + 1u, sizeof(kInvalidPacket) / 4);
+
+  Sdes parsed;
+  EXPECT_FALSE(Parse(kInvalidPacket, sizeof(kInvalidPacket), &parsed));
+}
+
+TEST(RtcpPacketSdesTest, ParseFailsWithDamagedChunkItem) {
+  const char kName[] = "ab";
+  const char kCname[] = "d";
+  // Next chunk item has non-terminator type, but not the size.
+  const uint8_t kInvalidPacket[] = {0x81,  202, 0x00, 0x03,
+                                    0x12, 0x34, 0x56, 0x78,
+                                    kNameTag,  2, kName[0], kName[1],
+                                    kCnameTag, 1, kCname[0],
+                                    kEmailTag};
+  // Sanity checks packet was assembled correctly.
+  ASSERT_EQ(0u, sizeof(kInvalidPacket) % 4);
+  ASSERT_EQ(kInvalidPacket[3] + 1u, sizeof(kInvalidPacket) / 4);
+
+  Sdes parsed;
+  EXPECT_FALSE(Parse(kInvalidPacket, sizeof(kInvalidPacket), &parsed));
+}
+
+TEST(RtcpPacketSdesTest, ParseFailsWithTooLongChunkItem) {
+  const char kName[] = "abc";
+  const char kCname[] = "d";
+  // Last chunk item has length that goes beyond the buffer end.
+  const uint8_t kInvalidPacket[] = {0x81,  202, 0x00, 0x03,
+                                    0x12, 0x34, 0x56, 0x78,
+                                    kNameTag,  3, kName[0], kName[1], kName[2],
+                                    kCnameTag, 2, kCname[0]};
+  // Sanity checks packet was assembled correctly.
+  ASSERT_EQ(0u, sizeof(kInvalidPacket) % 4);
+  ASSERT_EQ(kInvalidPacket[3] + 1u, sizeof(kInvalidPacket) / 4);
+
+  Sdes parsed;
+  EXPECT_FALSE(Parse(kInvalidPacket, sizeof(kInvalidPacket), &parsed));
+}
+
+TEST(RtcpPacketSdesTest, ParseFailsWithTwoCNames) {
+  const char kCname1[] = "a";
+  const char kCname2[] = "de";
+  const uint8_t kInvalidPacket[] = {0x81,  202, 0x00, 0x03,
+                                    0x12, 0x34, 0x56, 0x78,
+                                    kCnameTag, 1, kCname1[0],
+                                    kCnameTag, 2, kCname2[0], kCname2[1],
+                                    kTerminatorTag};
+  // Sanity checks packet was assembled correctly.
+  ASSERT_EQ(0u, sizeof(kInvalidPacket) % 4);
+  ASSERT_EQ(kInvalidPacket[3] + 1u, sizeof(kInvalidPacket) / 4);
+
+  Sdes parsed;
+  EXPECT_FALSE(Parse(kInvalidPacket, sizeof(kInvalidPacket), &parsed));
+}
+
+TEST(RtcpPacketSdesTest, ParseFailsWithTooLittleSpaceForNextChunk) {
+  const char kCname[] = "a";
+  const char kEmail[] = "de";
+  // Two chunks are promised in the header, but no place for the second chunk.
+  const uint8_t kInvalidPacket[] = {0x82,  202, 0x00, 0x04,
+                                    0x12, 0x34, 0x56, 0x78,  // 1st chunk.
+                                    kCnameTag, 1, kCname[0],
+                                    kEmailTag, 2, kEmail[0], kEmail[1],
+                                    kTerminatorTag,
+                                    0x23, 0x45, 0x67, 0x89};  // 2nd chunk.
+  // Sanity checks packet was assembled correctly.
+  ASSERT_EQ(0u, sizeof(kInvalidPacket) % 4);
+  ASSERT_EQ(kInvalidPacket[3] + 1u, sizeof(kInvalidPacket) / 4);
+
+  Sdes parsed;
+  EXPECT_FALSE(Parse(kInvalidPacket, sizeof(kInvalidPacket), &parsed));
+}
+
+TEST(RtcpPacketSdesTest, ParsedSdesCanBeReusedForBuilding) {
+  Sdes source;
+  const std::string kAlice = "alice@host";
+  const std::string kBob = "bob@host";
+  source.WithCName(kSenderSsrc, kAlice);
+
+  rtc::scoped_ptr<RawPacket> packet1 = source.Build();
+  Sdes middle;
+  Parse(packet1->Buffer(), packet1->Length(), &middle);
+
+  EXPECT_EQ(source.BlockLength(), middle.BlockLength());
+
+  middle.WithCName(kSenderSsrc + 1, kBob);
+
+  rtc::scoped_ptr<RawPacket> packet2 = middle.Build();
+  Sdes destination;
+  Parse(packet2->Buffer(), packet2->Length(), &destination);
+
+  EXPECT_EQ(middle.BlockLength(), destination.BlockLength());
+
+  EXPECT_EQ(2u, destination.chunks().size());
+  EXPECT_EQ(kSenderSsrc, destination.chunks()[0].ssrc);
+  EXPECT_EQ(kAlice, destination.chunks()[0].cname);
+  EXPECT_EQ(kSenderSsrc + 1, destination.chunks()[1].ssrc);
+  EXPECT_EQ(kBob, destination.chunks()[1].cname);
+}
 }  // namespace webrtc