Add JSON-specific escaping, which has different rules from JS escaping.

base/string_util.cc

 // Copyright (c) 2006-2008 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.
 
 #include "base/string_util.h"
 
 #include "build/build_config.h"
 
 #include <ctype.h>
 #include <errno.h>
@@ skipping 19 matching lines @@
 // Force the singleton used by Empty[W]String[16] to be a unique type. This
 // prevents other code that might accidentally use Singleton<string> from
 // getting our internal one.
 struct EmptyStrings {
   EmptyStrings() {}
   const std::string s;
   const std::wstring ws;
   const string16 s16;
 };
 
-// Hack to convert any char-like type to its unsigned counterpart.
-// For example, it will convert char, signed char and unsigned char to unsigned
-// char.
-template<typename T>
-struct ToUnsigned {
-  typedef T Unsigned;
-};
-
-template<>
-struct ToUnsigned<char> {
-  typedef unsigned char Unsigned;
-};
-template<>
-struct ToUnsigned<signed char> {
-  typedef unsigned char Unsigned;
-};
-template<>
-struct ToUnsigned<wchar_t> {
-#if defined(WCHAR_T_IS_UTF16)
-  typedef unsigned short Unsigned;
-#elif defined(WCHAR_T_IS_UTF32)
-  typedef uint32 Unsigned;
-#endif
-};
-template<>
-struct ToUnsigned<short> {
-  typedef unsigned short Unsigned;
-};
-
 // Used by ReplaceStringPlaceholders to track the position in the string of
 // replaced parameters.
 struct ReplacementOffset {
   ReplacementOffset(int parameter, size_t offset)
       : parameter(parameter),
         offset(offset) {}
 
   // Index of the parameter.
   int parameter;
 
@@ skipping 1584 matching lines @@
   // Each input byte creates two output hex characters.
   std::string ret(size * 2, '\0');
 
   for (size_t i = 0; i < size; ++i) {
     char b = reinterpret_cast<const char*>(bytes)[i];
     ret[(i * 2)] = kHexChars[(b >> 4) & 0xf];
     ret[(i * 2) + 1] = kHexChars[b & 0xf];
   }
   return ret;
 }