Escape invalid code points

base/json/string_escape.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file defines utility functions for escaping strings suitable for JSON.
 
 #ifndef BASE_JSON_STRING_ESCAPE_H_
 #define BASE_JSON_STRING_ESCAPE_H_
 
 #include <string>
 
 #include "base/base_export.h"
 #include "base/strings/string_piece.h"
 
 namespace base {
 
-// Appends to |dest| an escaped version of |str|. Valid UTF-8 code units will
-// pass through from the input to the output. Invalid code units will be
-// replaced with the U+FFFD replacement character. This function returns true
-// if no replacement was necessary and false if there was a lossy replacement.
-// On return, |dest| will contain a valid UTF-8 JSON string.
+// Appends to |dest| an escaped version of |str|. Valid UTF-8 code units and
+// characters will pass through from the input to the output. Invalid code
+// units and characters will be replaced with the U+FFFD replacement character.
+// This function returns true if no replacement was necessary and false if
+// there was a lossy replacement. On return, |dest| will contain a valid UTF-8
+// JSON string.
 //
 // Non-printing control characters will be escaped as \uXXXX sequences for
 // readability.
 //
 // If |put_in_quotes| is true, then a leading and trailing double-quote mark
 // will be appended to |dest| as well.
 BASE_EXPORT bool EscapeJSONString(const StringPiece& str,
                                   bool put_in_quotes,
                                   std::string* dest);
 
@@ skipping 19 matching lines @@
 // interpret it as UTF-16 and convert it to UTF-8.
 //
 // The output of this function takes the *appearance* of JSON but is not in
 // fact valid according to RFC 4627.
 BASE_EXPORT std::string EscapeBytesAsInvalidJSONString(const StringPiece& str,
                                                        bool put_in_quotes);
 
 }  // namespace base
 
 #endif  // BASE_JSON_STRING_ESCAPE_H_