[rtcp] App::Parse updated not to use RTCPUtility,

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

Index: webrtc/modules/rtp_rtcp/source/rtcp_packet/app.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtcp_packet/app.cc b/webrtc/modules/rtp_rtcp/source/rtcp_packet/app.cc
index a1ad8d6427992a06b12c727b8a135416d1d47622..205fdbb092f415932e59b84a1b1c3f32d78c3689 100644
--- a/webrtc/modules/rtp_rtcp/source/rtcp_packet/app.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtcp_packet/app.cc
@@ -13,12 +13,12 @@
 #include "webrtc/base/checks.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/modules/rtp_rtcp/source/byte_io.h"
-
-using webrtc::RTCPUtility::RtcpCommonHeader;
+#include "webrtc/modules/rtp_rtcp/source/rtcp_packet/common_header.h"
 
 namespace webrtc {
 namespace rtcp {
-
+constexpr uint8_t App::kPacketType;
+constexpr size_t App::kMaxDataSize;
 // Application-Defined packet (APP) (RFC 3550).
 //
 //     0                   1                   2                   3
@@ -32,13 +32,22 @@ namespace rtcp {
 //    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 //  8 |                   application-dependent data                ...
 //    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-bool App::Parse(const RtcpCommonHeader& header, const uint8_t* payload) {
-  RTC_DCHECK(header.packet_type == kPacketType);
-
-  sub_type_ = header.count_or_format;
-  ssrc_ = ByteReader<uint32_t>::ReadBigEndian(&payload[0]);
-  name_ = ByteReader<uint32_t>::ReadBigEndian(&payload[4]);
-  data_.SetData(&payload[8], header.payload_size_bytes - 8);
+bool App::Parse(const CommonHeader& packet) {
+  RTC_DCHECK_EQ(packet.type(), kPacketType);
+  if (packet.payload_size_bytes() < kAppBaseLength) {
+    LOG(LS_WARNING) << "Packet is too small to be a valid APP packet";
+    return false;
+  }
+  if (packet.payload_size_bytes() % 4 != 0) {
+    LOG(LS_WARNING)
+        << "Packet payload must be 32 bits aligned to make a valid APP packet";
+    return false;
+  }
+  sub_type_ = packet.fmt();
+  ssrc_ = ByteReader<uint32_t>::ReadBigEndian(&packet.payload()[0]);
+  name_ = ByteReader<uint32_t>::ReadBigEndian(&packet.payload()[4]);
+  data_.SetData(packet.payload() + kAppBaseLength,
+                packet.payload_size_bytes() - kAppBaseLength);
   return true;
 }
 
@@ -49,10 +58,10 @@ void App::WithSubType(uint8_t subtype) {
 
 void App::WithData(const uint8_t* data, size_t data_length) {
   RTC_DCHECK(data);
-  RTC_DCHECK_EQ(0u, data_length % 4) << "Data must be 32 bits aligned.";
-  RTC_DCHECK(data_length <= kMaxDataSize) << "App data size << " << data_length
-                                          << "exceed maximum of "
-                                          << kMaxDataSize << " bytes.";
+  RTC_DCHECK_EQ(data_length % 4, 0u) << "Data must be 32 bits aligned.";
+  RTC_DCHECK_LE(data_length, kMaxDataSize) << "App data size " << data_length
+                                           << " exceed maximum of "
+                                           << kMaxDataSize << " bytes.";
   data_.SetData(data, data_length);
 }