diff options
Diffstat (limited to 'base/string_util_icu.cc')
| -rw-r--r-- | base/string_util_icu.cc | 613 |
1 files changed, 0 insertions, 613 deletions
diff --git a/base/string_util_icu.cc b/base/string_util_icu.cc index d3c9edf..68fbd10 100644 --- a/base/string_util_icu.cc +++ b/base/string_util_icu.cc @@ -11,621 +11,8 @@ #include "base/logging.h" #include "base/singleton.h" #include "unicode/numfmt.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; -} - // Number formatting ----------------------------------------------------------- namespace { |