Cast: Limit number of events/packets in EncodingEventSubscriber protos.

media/cast/logging/log_serializer.cc

Index: media/cast/logging/log_serializer.cc
diff --git a/media/cast/logging/log_serializer.cc b/media/cast/logging/log_serializer.cc
index 3452c903bf94aadfd700f6447ddddd4733fedaa1..3423d94200d65a3be05f15587dfd8aacfa27887a 100644
--- a/media/cast/logging/log_serializer.cc
+++ b/media/cast/logging/log_serializer.cc
@@ -19,6 +19,7 @@
 #include "media/cast/logging/log_serializer.h"
 
 #include "base/big_endian.h"
+#include "base/logging.h"
 #include "third_party/zlib/zlib.h"
 
 namespace media {
@@ -33,6 +34,8 @@ using media::cast::proto::LogMetadata;
 // Use 30MB of temp buffer to hold uncompressed data if |compress| is true.
 const int kMaxUncompressedBytes = 30 * 1000 * 1000;
 
+// The maximum allowed size per serialized proto.
+const int kMaxSerializedProtoBytes = (1 << 16) - 1;
 bool DoSerializeEvents(const LogMetadata& metadata,
                        const FrameEventMap& frame_events,
                        const PacketEventMap& packet_events,
@@ -42,6 +45,7 @@ bool DoSerializeEvents(const LogMetadata& metadata,
   base::BigEndianWriter writer(output, max_output_bytes);
 
   int proto_size = metadata.ByteSize();
+  DCHECK(proto_size <= kMaxSerializedProtoBytes);
   if (!writer.WriteU16(proto_size))
     return false;
   if (!metadata.SerializeToArray(writer.ptr(), writer.remaining()))
@@ -63,6 +67,7 @@ bool DoSerializeEvents(const LogMetadata& metadata,
     prev_rtp_timestamp = it->first;
 
     proto_size = frame_event.ByteSize();
+    DCHECK(proto_size <= kMaxSerializedProtoBytes);
 
     // Write size of the proto, then write the proto.
     if (!writer.WriteU16(proto_size))
@@ -84,6 +89,7 @@ bool DoSerializeEvents(const LogMetadata& metadata,
     prev_rtp_timestamp = it->first;
 
     proto_size = packet_event.ByteSize();
+    DCHECK(proto_size <= kMaxSerializedProtoBytes);
 
     // Write size of the proto, then write the proto.
     if (!writer.WriteU16(proto_size))