// Copyright (c) 2014 Marshall A. Greenblatt. Portions copyright (c) 2013
// Google 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:
//
//    * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//    * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//    * Neither the name of Google Inc. nor the name Chromium Embedded
// Framework nor the names of its contributors may be used to endorse
// or promote products derived from this software without specific prior
// written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef CEF_INCLUDE_BASE_CEF_STRING16_H_
#define CEF_INCLUDE_BASE_CEF_STRING16_H_
#pragma once

#if defined(BASE_STRINGS_STRING16_H_)
// Do nothing if the Chromium header has already been included.
// This can happen in cases where Chromium code is used directly by the
// client application. When using Chromium code directly always include
// the Chromium header first to avoid type conflicts.
#elif defined(USING_CHROMIUM_INCLUDES)
// When building CEF include the Chromium header directly.
#include "base/strings/string16.h"
#else  // !USING_CHROMIUM_INCLUDES
// The following is substantially similar to the Chromium implementation.
// If the Chromium implementation diverges the below implementation should be
// updated to match.
// WHAT:
// A version of std::basic_string that provides 2-byte characters even when
// wchar_t is not implemented as a 2-byte type. You can access this class as
// string16. We also define char16, which string16 is based upon.
//
// WHY:
// On Windows, wchar_t is 2 bytes, and it can conveniently handle UTF-16/UCS-2
// data. Plenty of existing code operates on strings encoded as UTF-16.
//
// On many other platforms, sizeof(wchar_t) is 4 bytes by default. We can make
// it 2 bytes by using the GCC flag -fshort-wchar. But then std::wstring fails
// at run time, because it calls some functions (like wcslen) that come from
// the system's native C library -- which was built with a 4-byte wchar_t!
// It's wasteful to use 4-byte wchar_t strings to carry UTF-16 data, and it's
// entirely improper on those systems where the encoding of wchar_t is defined
// as UTF-32.
//
// Here, we define string16, which is similar to std::wstring but replaces all
// libc functions with custom, 2-byte-char compatible routines. It is capable
// of carrying UTF-16-encoded data.

#include 
#include 

#include "include/base/cef_basictypes.h"

#if defined(WCHAR_T_IS_UTF16)

namespace base {

typedef wchar_t char16;
typedef std::wstring string16;
typedef std::char_traits string16_char_traits;

}  // namespace base

#elif defined(WCHAR_T_IS_UTF32)

#include   // For uint16_t

#include "include/base/cef_macros.h"

namespace base {

typedef uint16_t char16;

// char16 versions of the functions required by string16_char_traits; these
// are based on the wide character functions of similar names ("w" or "wcs"
// instead of "c16").
int c16memcmp(const char16* s1, const char16* s2, size_t n);
size_t c16len(const char16* s);
const char16* c16memchr(const char16* s, char16 c, size_t n);
char16* c16memmove(char16* s1, const char16* s2, size_t n);
char16* c16memcpy(char16* s1, const char16* s2, size_t n);
char16* c16memset(char16* s, char16 c, size_t n);

struct string16_char_traits {
  typedef char16 char_type;
  typedef int int_type;

  // int_type needs to be able to hold each possible value of char_type, and in
  // addition, the distinct value of eof().
  COMPILE_ASSERT(sizeof(int_type) > sizeof(char_type), unexpected_type_width);

  typedef std::streamoff off_type;
  typedef mbstate_t state_type;
  typedef std::fpos pos_type;

  static void assign(char_type& c1, const char_type& c2) {
    c1 = c2;
  }

  static bool eq(const char_type& c1, const char_type& c2) {
    return c1 == c2;
  }
  static bool lt(const char_type& c1, const char_type& c2) {
    return c1 < c2;
  }

  static int compare(const char_type* s1, const char_type* s2, size_t n) {
    return c16memcmp(s1, s2, n);
  }

  static size_t length(const char_type* s) {
    return c16len(s);
  }

  static const char_type* find(const char_type* s, size_t n,
                               const char_type& a) {
    return c16memchr(s, a, n);
  }

  static char_type* move(char_type* s1, const char_type* s2, int_type n) {
    return c16memmove(s1, s2, n);
  }

  static char_type* copy(char_type* s1, const char_type* s2, size_t n) {
    return c16memcpy(s1, s2, n);
  }

  static char_type* assign(char_type* s, size_t n, char_type a) {
    return c16memset(s, a, n);
  }

  static int_type not_eof(const int_type& c) {
    return eq_int_type(c, eof()) ? 0 : c;
  }

  static char_type to_char_type(const int_type& c) {
    return char_type(c);
  }

  static int_type to_int_type(const char_type& c) {
    return int_type(c);
  }

  static bool eq_int_type(const int_type& c1, const int_type& c2) {
    return c1 == c2;
  }

  static int_type eof() {
    return static_cast(EOF);
  }
};

typedef std::basic_string string16;

extern std::ostream& operator