Convert base dependencies to use sys_string_conversions instead of the ICU...

base/i18n/string_conversions.cc

Index: base/i18n/string_conversions.cc
===================================================================
--- base/i18n/string_conversions.cc	(revision 28166)
+++ base/i18n/string_conversions.cc	(working copy)
@@ -1,626 +0,0 @@
-// Copyright (c) 2009 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/i18n/string_conversions.h"
-
-#include <vector>
-
-#include "base/basictypes.h"
-#include "base/logging.h"
-#include "base/string_util.h"
-#include "unicode/ucnv.h"
-#include "unicode/ucnv_cb.h"
-#include "unicode/ucnv_err.h"
-#include "unicode/ustring.h"
-
-namespace {
-
-inline bool IsValidCodepoint(uint32 code_point) {
-  // Excludes the surrogate code points ([0xD800, 0xDFFF]) and
-  // codepoints larger than 0x10FFFF (the highest codepoint allowed).
-  // Non-characters and unassigned codepoints are allowed.
-  return code_point < 0xD800u ||
-         (code_point >= 0xE000u && code_point <= 0x10FFFFu);
-}
-
-// ToUnicodeCallbackSubstitute() is based on UCNV_TO_U_CALLBACK_SUSBSTITUTE
-// in source/common/ucnv_err.c.
-
-// Copyright (c) 1995-2006 International Business Machines Corporation
-// and others
-//
-// All rights reserved.
-//
-
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the "Software"),
-// to deal in the Software without restriction, including without limitation
-// the rights to use, copy, modify, merge, publish, distribute, and/or
-// sell copies of the Software, and to permit persons to whom the Software
-// is furnished to do so, provided that the above copyright notice(s) and
-// this permission notice appear in all copies of the Software and that
-// both the above copyright notice(s) and this permission notice appear in
-// supporting documentation.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
-// OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
-// INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT
-// OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
-// OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
-// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE
-// OR PERFORMANCE OF THIS SOFTWARE.
-//
-// Except as contained in this notice, the name of a copyright holder
-// shall not be used in advertising or otherwise to promote the sale, use
-// or other dealings in this Software without prior written authorization
-// of the copyright holder.
-
-//  ___________________________________________________________________________
-//
-// All trademarks and registered trademarks mentioned herein are the property
-// of their respective owners.
-
-void ToUnicodeCallbackSubstitute(const void* context,
-                                 UConverterToUnicodeArgs *to_args,
-                                 const char* code_units,
-                                 int32_t length,
-                                 UConverterCallbackReason reason,
-                                 UErrorCode * err) {
-  static const UChar kReplacementChar = 0xFFFD;
-  if (reason <= UCNV_IRREGULAR) {
-      if (context == NULL ||
-          (*(reinterpret_cast<const char*>(context)) == 'i' &&
-           reason == UCNV_UNASSIGNED)) {
-        *err = U_ZERO_ERROR;
-        ucnv_cbToUWriteUChars(to_args, &kReplacementChar, 1, 0, err);
-      }
-      // else the caller must have set the error code accordingly.
-  }
-  // else ignore the reset, close and clone calls.
-}
-
-// ReadUnicodeCharacter --------------------------------------------------------
-
-// Reads a UTF-8 stream, placing the next code point into the given output
-// |*code_point|. |src| represents the entire string to read, and |*char_index|
-// is the character offset within the string to start reading at. |*char_index|
-// will be updated to index the last character read, such that incrementing it
-// (as in a for loop) will take the reader to the next character.
-//
-// Returns true on success. On false, |*code_point| will be invalid.
-bool ReadUnicodeCharacter(const char* src, int32 src_len,
-                          int32* char_index, uint32* code_point_out) {
-  // U8_NEXT expects to be able to use -1 to signal an error, so we must
-  // use a signed type for code_point.  But this function returns false
-  // on error anyway, so code_point_out is unsigned.
-  int32 code_point;
-  U8_NEXT(src, *char_index, src_len, code_point);
-  *code_point_out = static_cast<uint32>(code_point);
-
-  // The ICU macro above moves to the next char, we want to point to the last
-  // char consumed.
-  (*char_index)--;
-
-  // Validate the decoded value.
-  return IsValidCodepoint(code_point);
-}
-
-// Reads a UTF-16 character. The usage is the same as the 8-bit version above.
-bool ReadUnicodeCharacter(const char16* src, int32 src_len,
-                          int32* char_index, uint32* code_point) {
-  if (U16_IS_SURROGATE(src[*char_index])) {
-    if (!U16_IS_SURROGATE_LEAD(src[*char_index]) ||
-        *char_index + 1 >= src_len ||
-        !U16_IS_TRAIL(src[*char_index + 1])) {
-      // Invalid surrogate pair.
-      return false;
-    }
-
-    // Valid surrogate pair.
-    *code_point = U16_GET_SUPPLEMENTARY(src[*char_index],
-                                        src[*char_index + 1]);
-    (*char_index)++;
-  } else {
-    // Not a surrogate, just one 16-bit word.
-    *code_point = src[*char_index];
-  }
-
-  return IsValidCodepoint(*code_point);
-}
-
-#if defined(WCHAR_T_IS_UTF32)
-// Reads UTF-32 character. The usage is the same as the 8-bit version above.
-bool ReadUnicodeCharacter(const wchar_t* src, int32 src_len,
-                          int32* char_index, uint32* code_point) {
-  // Conversion is easy since the source is 32-bit.
-  *code_point = src[*char_index];
-
-  // Validate the value.
-  return IsValidCodepoint(*code_point);
-}
-#endif  // defined(WCHAR_T_IS_UTF32)
-
-// WriteUnicodeCharacter -------------------------------------------------------
-
-// Appends a UTF-8 character to the given 8-bit string.
-void WriteUnicodeCharacter(uint32 code_point, std::string* output) {
-  if (code_point <= 0x7f) {
-    // Fast path the common case of one byte.
-    output->push_back(code_point);
-    return;
-  }
-
-  // U8_APPEND_UNSAFE can append up to 4 bytes.
-  int32 char_offset = static_cast<int32>(output->length());
-  output->resize(char_offset + U8_MAX_LENGTH);
-
-  U8_APPEND_UNSAFE(&(*output)[0], char_offset, code_point);
-
-  // U8_APPEND_UNSAFE will advance our pointer past the inserted character, so
-  // it will represent the new length of the string.
-  output->resize(char_offset);
-}
-
-// Appends the given code point as a UTF-16 character to the STL string.
-void WriteUnicodeCharacter(uint32 code_point, string16* output) {
-  if (U16_LENGTH(code_point) == 1) {
-    // Thie code point is in the Basic Multilingual Plane (BMP).
-    output->push_back(static_cast<char16>(code_point));
-  } else {
-    // Non-BMP characters use a double-character encoding.
-    int32 char_offset = static_cast<int32>(output->length());
-    output->resize(char_offset + U16_MAX_LENGTH);
-    U16_APPEND_UNSAFE(&(*output)[0], char_offset, code_point);
-  }
-}
-
-#if defined(WCHAR_T_IS_UTF32)
-// Appends the given UTF-32 character to the given 32-bit string.
-inline void WriteUnicodeCharacter(uint32 code_point, std::wstring* output) {
-  // This is the easy case, just append the character.
-  output->push_back(code_point);
-}
-#endif  // defined(WCHAR_T_IS_UTF32)
-
-// Generalized Unicode converter -----------------------------------------------
-
-// Converts the given source Unicode character type to the given destination
-// Unicode character type as a STL string. The given input buffer and size
-// determine the source, and the given output STL string will be replaced by
-// the result.
-template<typename SRC_CHAR, typename DEST_STRING>
-bool ConvertUnicode(const SRC_CHAR* src, size_t src_len, DEST_STRING* output) {
-  output->clear();
-
-  // ICU requires 32-bit numbers.
-  bool success = true;
-  int32 src_len32 = static_cast<int32>(src_len);
-  for (int32 i = 0; i < src_len32; i++) {
-    uint32 code_point;
-    if (ReadUnicodeCharacter(src, src_len32, &i, &code_point)) {
-      WriteUnicodeCharacter(code_point, output);
-    } else {
-      // TODO(jungshik): consider adding 'Replacement character' (U+FFFD)
-      // in place of an invalid codepoint.
-      success = false;
-    }
-  }
-  return success;
-}
-
-
-// Guesses the length of the output in UTF-8 in bytes, and reserves that amount
-// of space in the given string. We also assume that the input character types
-// are unsigned, which will be true for UTF-16 and -32 on our systems. We assume
-// the string length is greater than zero.
-template<typename CHAR>
-void ReserveUTF8Output(const CHAR* src, size_t src_len, std::string* output) {
-  if (src[0] < 0x80) {
-    // Assume that the entire input will be ASCII.
-    output->reserve(src_len);
-  } else {
-    // Assume that the entire input is non-ASCII and will have 3 bytes per char.
-    output->reserve(src_len * 3);
-  }
-}
-
-// Guesses the size of the output buffer (containing either UTF-16 or -32 data)
-// given some UTF-8 input that will be converted to it. See ReserveUTF8Output.
-// We assume the source length is > 0.
-template<typename STRING>
-void ReserveUTF16Or32Output(const char* src, size_t src_len, STRING* output) {
-  if (static_cast<unsigned char>(src[0]) < 0x80) {
-    // Assume the input is all ASCII, which means 1:1 correspondence.
-    output->reserve(src_len);
-  } else {
-    // Otherwise assume that the UTF-8 sequences will have 2 bytes for each
-    // character.
-    output->reserve(src_len / 2);
-  }
-}
-
-bool ConvertFromUTF16(UConverter* converter, const UChar* uchar_src,
-                      int uchar_len, OnStringUtilConversionError::Type on_error,
-                      std::string* encoded) {
-  int encoded_max_length = UCNV_GET_MAX_BYTES_FOR_STRING(uchar_len,
-      ucnv_getMaxCharSize(converter));
-  encoded->resize(encoded_max_length);
-
-  UErrorCode status = U_ZERO_ERROR;
-
-  // Setup our error handler.
-  switch (on_error) {
-    case OnStringUtilConversionError::FAIL:
-      ucnv_setFromUCallBack(converter, UCNV_FROM_U_CALLBACK_STOP, 0,
-                            NULL, NULL, &status);
-      break;
-    case OnStringUtilConversionError::SKIP:
-    case OnStringUtilConversionError::SUBSTITUTE:
-      ucnv_setFromUCallBack(converter, UCNV_FROM_U_CALLBACK_SKIP, 0,
-                            NULL, NULL, &status);
-      break;
-    default:
-      NOTREACHED();
-  }
-
-  // ucnv_fromUChars returns size not including terminating null
-  int actual_size = ucnv_fromUChars(converter, &(*encoded)[0],
-      encoded_max_length, uchar_src, uchar_len, &status);
-  encoded->resize(actual_size);
-  ucnv_close(converter);
-  if (U_SUCCESS(status))
-    return true;
-  encoded->clear();  // Make sure the output is empty on error.
-  return false;
-}
-
-// Set up our error handler for ToUTF-16 converters
-void SetUpErrorHandlerForToUChars(OnStringUtilConversionError::Type on_error,
-                                  UConverter* converter, UErrorCode* status) {
-  switch (on_error) {
-    case OnStringUtilConversionError::FAIL:
-      ucnv_setToUCallBack(converter, UCNV_TO_U_CALLBACK_STOP, 0,
-                          NULL, NULL, status);
-      break;
-    case OnStringUtilConversionError::SKIP:
-      ucnv_setToUCallBack(converter, UCNV_TO_U_CALLBACK_SKIP, 0,
-                          NULL, NULL, status);
-      break;
-    case OnStringUtilConversionError::SUBSTITUTE:
-      ucnv_setToUCallBack(converter, ToUnicodeCallbackSubstitute, 0,
-                          NULL, NULL, status);
-      break;
-    default:
-      NOTREACHED();
-  }
-}
-
-inline UConverterType utf32_platform_endian() {
-#if U_IS_BIG_ENDIAN
-  return UCNV_UTF32_BigEndian;
-#else
-  return UCNV_UTF32_LittleEndian;
-#endif
-}
-
-}  // namespace
-
-// UTF-8 <-> Wide --------------------------------------------------------------
-
-std::string WideToUTF8(const std::wstring& wide) {
-  std::string ret;
-  if (wide.empty())
-    return ret;
-
-  // Ignore the success flag of this call, it will do the best it can for
-  // invalid input, which is what we want here.
-  WideToUTF8(wide.data(), wide.length(), &ret);
-  return ret;
-}
-
-bool WideToUTF8(const wchar_t* src, size_t src_len, std::string* output) {
-  if (src_len == 0) {
-    output->clear();
-    return true;
-  }
-
-  ReserveUTF8Output(src, src_len, output);
-  return ConvertUnicode<wchar_t, std::string>(src, src_len, output);
-}
-
-std::wstring UTF8ToWide(const base::StringPiece& utf8) {
-  std::wstring ret;
-  if (utf8.empty())
-    return ret;
-
-  UTF8ToWide(utf8.data(), utf8.length(), &ret);
-  return ret;
-}
-
-bool UTF8ToWide(const char* src, size_t src_len, std::wstring* output) {
-  if (src_len == 0) {
-    output->clear();
-    return true;
-  }
-
-  ReserveUTF16Or32Output(src, src_len, output);
-  return ConvertUnicode<char, std::wstring>(src, src_len, output);
-}
-
-// UTF-16 <-> Wide -------------------------------------------------------------
-
-#if defined(WCHAR_T_IS_UTF16)
-
-// When wide == UTF-16, then conversions are a NOP.
-string16 WideToUTF16(const std::wstring& wide) {
-  return wide;
-}
-
-bool WideToUTF16(const wchar_t* src, size_t src_len, string16* output) {
-  output->assign(src, src_len);
-  return true;
-}
-
-std::wstring UTF16ToWide(const string16& utf16) {
-  return utf16;
-}
-
-bool UTF16ToWide(const char16* src, size_t src_len, std::wstring* output) {
-  output->assign(src, src_len);
-  return true;
-}
-
-#elif defined(WCHAR_T_IS_UTF32)
-
-string16 WideToUTF16(const std::wstring& wide) {
-  string16 ret;
-  if (wide.empty())
-    return ret;
-
-  WideToUTF16(wide.data(), wide.length(), &ret);
-  return ret;
-}
-
-bool WideToUTF16(const wchar_t* src, size_t src_len, string16* output) {
-  if (src_len == 0) {
-    output->clear();
-    return true;
-  }
-
-  // Assume that normally we won't have any non-BMP characters so the counts
-  // will be the same.
-  output->reserve(src_len);
-  return ConvertUnicode<wchar_t, string16>(src, src_len, output);
-}
-
-std::wstring UTF16ToWide(const string16& utf16) {
-  std::wstring ret;
-  if (utf16.empty())
-    return ret;
-
-  UTF16ToWide(utf16.data(), utf16.length(), &ret);
-  return ret;
-}
-
-bool UTF16ToWide(const char16* src, size_t src_len, std::wstring* output) {
-  if (src_len == 0) {
-    output->clear();
-    return true;
-  }
-
-  // Assume that normally we won't have any non-BMP characters so the counts
-  // will be the same.
-  output->reserve(src_len);
-  return ConvertUnicode<char16, std::wstring>(src, src_len, output);
-}
-
-#endif  // defined(WCHAR_T_IS_UTF32)
-
-// UTF16 <-> UTF8 --------------------------------------------------------------
-
-#if defined(WCHAR_T_IS_UTF32)
-
-bool UTF8ToUTF16(const char* src, size_t src_len, string16* output) {
-  if (src_len == 0) {
-    output->clear();
-    return true;
-  }
-
-  ReserveUTF16Or32Output(src, src_len, output);
-  return ConvertUnicode<char, string16>(src, src_len, output);
-}
-
-string16 UTF8ToUTF16(const std::string& utf8) {
-  string16 ret;
-  if (utf8.empty())
-    return ret;
-
-  // Ignore the success flag of this call, it will do the best it can for
-  // invalid input, which is what we want here.
-  UTF8ToUTF16(utf8.data(), utf8.length(), &ret);
-  return ret;
-}
-
-bool UTF16ToUTF8(const char16* src, size_t src_len, std::string* output) {
-  if (src_len == 0) {
-    output->clear();
-    return true;
-  }
-
-  ReserveUTF8Output(src, src_len, output);
-  return ConvertUnicode<char16, std::string>(src, src_len, output);
-}
-
-std::string UTF16ToUTF8(const string16& utf16) {
-  std::string ret;
-  if (utf16.empty())
-    return ret;
-
-  // Ignore the success flag of this call, it will do the best it can for
-  // invalid input, which is what we want here.
-  UTF16ToUTF8(utf16.data(), utf16.length(), &ret);
-  return ret;
-}
-
-#elif defined(WCHAR_T_IS_UTF16)
-// Easy case since we can use the "wide" versions we already wrote above.
-
-bool UTF8ToUTF16(const char* src, size_t src_len, string16* output) {
-  return UTF8ToWide(src, src_len, output);
-}
-
-string16 UTF8ToUTF16(const std::string& utf8) {
-  return UTF8ToWide(utf8);
-}
-
-bool UTF16ToUTF8(const char16* src, size_t src_len, std::string* output) {
-  return WideToUTF8(src, src_len, output);
-}
-
-std::string UTF16ToUTF8(const string16& utf16) {
-  return WideToUTF8(utf16);
-}
-
-#endif
-
-// Codepage <-> Wide/UTF-16  ---------------------------------------------------
-
-// Convert a wstring into the specified codepage_name.  If the codepage
-// isn't found, return false.
-bool WideToCodepage(const std::wstring& wide,
-                    const char* codepage_name,
-                    OnStringUtilConversionError::Type on_error,
-                    std::string* encoded) {
-#if defined(WCHAR_T_IS_UTF16)
-  return UTF16ToCodepage(wide, codepage_name, on_error, encoded);
-#elif defined(WCHAR_T_IS_UTF32)
-  encoded->clear();
-
-  UErrorCode status = U_ZERO_ERROR;
-  UConverter* converter = ucnv_open(codepage_name, &status);
-  if (!U_SUCCESS(status))
-    return false;
-
-  int utf16_len;
-  // When wchar_t is wider than UChar (16 bits), transform |wide| into a
-  // UChar* string.  Size the UChar* buffer to be large enough to hold twice
-  // as many UTF-16 code units (UChar's) as there are Unicode code points,
-  // in case each code points translates to a UTF-16 surrogate pair,
-  // and leave room for a NUL terminator.
-  std::vector<UChar> utf16(wide.length() * 2 + 1);
-  u_strFromWCS(&utf16[0], utf16.size(), &utf16_len,
-               wide.c_str(), wide.length(), &status);
-  DCHECK(U_SUCCESS(status)) << "failed to convert wstring to UChar*";
-
-  return ConvertFromUTF16(converter, &utf16[0], utf16_len, on_error, encoded);
-#endif  // defined(WCHAR_T_IS_UTF32)
-}
-
-// Convert a UTF-16 string into the specified codepage_name.  If the codepage
-// isn't found, return false.
-bool UTF16ToCodepage(const string16& utf16,
-                    const char* codepage_name,
-                    OnStringUtilConversionError::Type on_error,
-                    std::string* encoded) {
-  encoded->clear();
-
-  UErrorCode status = U_ZERO_ERROR;
-  UConverter* converter = ucnv_open(codepage_name, &status);
-  if (!U_SUCCESS(status))
-    return false;
-
-  return ConvertFromUTF16(converter, utf16.c_str(),
-                          static_cast<int>(utf16.length()), on_error, encoded);
-}
-
-// Converts a string of the given codepage into wstring.
-// If the codepage isn't found, return false.
-bool CodepageToWide(const std::string& encoded,
-                    const char* codepage_name,
-                    OnStringUtilConversionError::Type on_error,
-                    std::wstring* wide) {
-#if defined(WCHAR_T_IS_UTF16)
-  return CodepageToUTF16(encoded, codepage_name, on_error, wide);
-#elif defined(WCHAR_T_IS_UTF32)
-  wide->clear();
-
-  UErrorCode status = U_ZERO_ERROR;
-  UConverter* converter = ucnv_open(codepage_name, &status);
-  if (!U_SUCCESS(status))
-    return false;
-
-  // The maximum length in 4 byte unit of UTF-32 output would be
-  // at most the same as the number of bytes in input. In the worst
-  // case of GB18030 (excluding escaped-based encodings like ISO-2022-JP),
-  // this can be 4 times larger than actually needed.
-  size_t wchar_max_length = encoded.length() + 1;
-
-  // The byte buffer and its length to pass to ucnv_toAlgorithimic.
-  char* byte_buffer = reinterpret_cast<char*>(
-      WriteInto(wide, wchar_max_length));
-  int byte_buffer_length = static_cast<int>(wchar_max_length) * 4;
-
-  SetUpErrorHandlerForToUChars(on_error, converter, &status);
-  int actual_size = ucnv_toAlgorithmic(utf32_platform_endian(),
-                                       converter,
-                                       byte_buffer,
-                                       byte_buffer_length,
-                                       encoded.data(),
-                                       static_cast<int>(encoded.length()),
-                                       &status);
-  ucnv_close(converter);
-
-  if (!U_SUCCESS(status)) {
-    wide->clear();  // Make sure the output is empty on error.
-    return false;
-  }
-
-  // actual_size is # of bytes.
-  wide->resize(actual_size / 4);
-  return true;
-#endif  // defined(WCHAR_T_IS_UTF32)
-}
-
-// Converts a string of the given codepage into UTF-16.
-// If the codepage isn't found, return false.
-bool CodepageToUTF16(const std::string& encoded,
-                     const char* codepage_name,
-                     OnStringUtilConversionError::Type on_error,
-                     string16* utf16) {
-  utf16->clear();
-
-  UErrorCode status = U_ZERO_ERROR;
-  UConverter* converter = ucnv_open(codepage_name, &status);
-  if (!U_SUCCESS(status))
-    return false;
-
-  // Even in the worst case, the maximum length in 2-byte units of UTF-16
-  // output would be at most the same as the number of bytes in input. There
-  // is no single-byte encoding in which a character is mapped to a
-  // non-BMP character requiring two 2-byte units.
-  //
-  // Moreover, non-BMP characters in legacy multibyte encodings
-  // (e.g. EUC-JP, GB18030) take at least 2 bytes. The only exceptions are
-  // BOCU and SCSU, but we don't care about them.
-  size_t uchar_max_length = encoded.length() + 1;
-
-  SetUpErrorHandlerForToUChars(on_error, converter, &status);
-  int actual_size = ucnv_toUChars(converter,
-                                  WriteInto(utf16, uchar_max_length),
-                                  static_cast<int>(uchar_max_length),
-                                  encoded.data(),
-                                  static_cast<int>(encoded.length()),
-                                  &status);
-  ucnv_close(converter);
-  if (!U_SUCCESS(status)) {
-    utf16->clear();  // Make sure the output is empty on error.
-    return false;
-  }
-
-  utf16->resize(actual_size);
-  return true;
-}
-