UTF-16 Decoder: Convert unpaired surrogates to replacement characters

third_party/WebKit/Source/wtf/text/TextCodecUTF16.h

 /*
  * Copyright (C) 2004, 2006 Apple Computer, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 17 matching lines @@
 
 #include "wtf/text/TextCodec.h"
 
 namespace WTF {
 
 class TextCodecUTF16 final : public TextCodec {
 public:
     static void registerEncodingNames(EncodingNameRegistrar);
     static void registerCodecs(TextCodecRegistrar);
 
-    TextCodecUTF16(bool littleEndian) : m_littleEndian(littleEndian), m_haveBufferedByte(false) {}
+    TextCodecUTF16(bool littleEndian) : m_littleEndian(littleEndian) {}
 
     String decode(const char*, size_t length, FlushBehavior, bool stopOnError, bool& sawError) override;
     CString encode(const UChar*, size_t length, UnencodableHandling) override;
     CString encode(const LChar*, size_t length, UnencodableHandling) override;
 
 private:
     bool m_littleEndian;
-    bool m_haveBufferedByte;
-    unsigned char m_bufferedByte;
+    bool m_haveLeadByte = false;
+    unsigned char m_leadByte;
+    bool m_haveLeadSurrogate = false;
+    UChar m_leadSurrogate;
 };
 
 } // namespace WTF
 
 #endif // TextCodecUTF16_h