Make atob() throw an InvalidCharacterError on excess padding characters

Source/wtf/text/Base64.h

 /*
  * Copyright (C) 2006 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
  *
  * 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
@@ skipping 21 matching lines @@
 #include "wtf/text/CString.h"
 #include "wtf/text/WTFString.h"
 
 namespace WTF {
 
 enum Base64EncodePolicy {
     Base64DoNotInsertLFs,
     Base64InsertLFs
 };
 
-enum Base64DecodePolicy {
+enum Base64InvalidCharactersPolicy {
     Base64FailOnInvalidCharacter,
     Base64IgnoreWhitespace,
     Base64IgnoreInvalidCharacters
 };
 
+enum Base64PaddingValidationPolicy {
+    Base64NoPaddingValidation,
+    Base64StrictPaddingValidation
+};
+
 WTF_EXPORT void base64Encode(const char*, unsigned, Vector<char>&, Base64EncodePolicy = Base64DoNotInsertLFs);
 WTF_EXPORT void base64Encode(const Vector<char>&, Vector<char>&, Base64EncodePolicy = Base64DoNotInsertLFs);
 WTF_EXPORT void base64Encode(const CString&, Vector<char>&, Base64EncodePolicy = Base64DoNotInsertLFs);
 WTF_EXPORT String base64Encode(const char*, unsigned, Base64EncodePolicy = Base64DoNotInsertLFs);
 WTF_EXPORT String base64Encode(const Vector<char>&, Base64EncodePolicy = Base64DoNotInsertLFs);
 WTF_EXPORT String base64Encode(const CString&, Base64EncodePolicy = Base64DoNotInsertLFs);
 
-WTF_EXPORT bool base64Decode(const String&, Vector<char>&, Base64DecodePolicy = Base64FailOnInvalidCharacter);
-WTF_EXPORT bool base64Decode(const Vector<char>&, Vector<char>&, Base64DecodePolicy = Base64FailOnInvalidCharacter);
-WTF_EXPORT bool base64Decode(const char*, unsigned, Vector<char>&, Base64DecodePolicy = Base64FailOnInvalidCharacter);
+WTF_EXPORT bool base64Decode(const String&, Vector<char>&, Base64InvalidCharactersPolicy = Base64FailOnInvalidCharacter, Base64PaddingValidationPolicy = Base64NoPaddingValidation);
+WTF_EXPORT bool base64Decode(const Vector<char>&, Vector<char>&, Base64InvalidCharactersPolicy = Base64FailOnInvalidCharacter, Base64PaddingValidationPolicy = Base64NoPaddingValidation);
+WTF_EXPORT bool base64Decode(const char*, unsigned, Vector<char>&, Base64InvalidCharactersPolicy = Base64FailOnInvalidCharacter, Base64PaddingValidationPolicy = Base64NoPaddingValidation);
 
 inline void base64Encode(const Vector<char>& in, Vector<char>& out, Base64EncodePolicy policy)
 {
     base64Encode(in.data(), in.size(), out, policy);
 }
 
 inline void base64Encode(const CString& in, Vector<char>& out, Base64EncodePolicy policy)
 {
     base64Encode(in.data(), in.length(), out, policy);
 }
 
 inline String base64Encode(const Vector<char>& in, Base64EncodePolicy policy)
 {
     return base64Encode(in.data(), in.size(), policy);
 }
 
 inline String base64Encode(const CString& in, Base64EncodePolicy policy)
 {
     return base64Encode(in.data(), in.length(), policy);
 }
 
 } // namespace WTF
 
 using WTF::Base64EncodePolicy;
 using WTF::Base64DoNotInsertLFs;
 using WTF::Base64InsertLFs;
-using WTF::Base64DecodePolicy;
+using WTF::Base64InvalidCharactersPolicy;
 using WTF::Base64FailOnInvalidCharacter;
 using WTF::Base64IgnoreWhitespace;
 using WTF::Base64IgnoreInvalidCharacters;
+using WTF::Base64PaddingValidationPolicy;
+using WTF::Base64NoPaddingValidation;
+using WTF::Base64StrictPaddingValidation;
 using WTF::base64Encode;
 using WTF::base64Decode;
 
 #endif // Base64_h