225 lines
8.3 KiB
C++
225 lines
8.3 KiB
C++
|
// Copyright (c) 2012 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/icu_string_conversions.h"
|
||
|
|
|
||
|
|
#include <stddef.h>
|
||
|
|
#include <stdint.h>
|
||
|
|
|
||
|
|
#include <memory>
|
||
|
|
#include <vector>
|
||
|
|
|
||
|
|
#include "base/logging.h"
|
||
|
|
#include "base/strings/string_util.h"
|
||
|
|
#include "base/strings/utf_string_conversions.h"
|
||
|
|
#include "third_party/icu/source/common/unicode/normalizer2.h"
|
||
|
|
#include "third_party/icu/source/common/unicode/ucnv.h"
|
||
|
|
#include "third_party/icu/source/common/unicode/ucnv_cb.h"
|
||
|
|
#include "third_party/icu/source/common/unicode/ucnv_err.h"
|
||
|
|
#include "third_party/icu/source/common/unicode/ustring.h"
|
||
|
|
|
||
|
|
namespace base {
|
||
|
|
|
||
|
|
namespace {
|
||
|
|
// ToUnicodeCallbackSubstitute() is based on UCNV_TO_U_CALLBACK_SUBSTITUTE
|
||
|
|
// 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 == nullptr ||
|
||
|
|
(*(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.
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ConvertFromUTF16(UConverter* converter,
|
||
|
|
base::StringPiece16 src,
|
||
|
|
OnStringConversionError::Type on_error,
|
||
|
|
std::string* encoded) {
|
||
|
|
int encoded_max_length = UCNV_GET_MAX_BYTES_FOR_STRING(
|
||
|
|
src.length(), ucnv_getMaxCharSize(converter));
|
||
|
|
encoded->resize(encoded_max_length);
|
||
|
|
|
||
|
|
UErrorCode status = U_ZERO_ERROR;
|
||
|
|
|
||
|
|
// Setup our error handler.
|
||
|
|
switch (on_error) {
|
||
|
|
case OnStringConversionError::FAIL:
|
||
|
|
ucnv_setFromUCallBack(converter, UCNV_FROM_U_CALLBACK_STOP, nullptr,
|
||
|
|
nullptr, nullptr, &status);
|
||
|
|
break;
|
||
|
|
case OnStringConversionError::SKIP:
|
||
|
|
case OnStringConversionError::SUBSTITUTE:
|
||
|
|
ucnv_setFromUCallBack(converter, UCNV_FROM_U_CALLBACK_SKIP, nullptr,
|
||
|
|
nullptr, nullptr, &status);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
NOTREACHED();
|
||
|
|
}
|
||
|
|
|
||
|
|
// ucnv_fromUChars returns size not including terminating null
|
||
|
|
int actual_size =
|
||
|
|
ucnv_fromUChars(converter, &(*encoded)[0], encoded_max_length, src.data(),
|
||
|
|
src.length(), &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(OnStringConversionError::Type on_error,
|
||
|
|
UConverter* converter, UErrorCode* status) {
|
||
|
|
switch (on_error) {
|
||
|
|
case OnStringConversionError::FAIL:
|
||
|
|
ucnv_setToUCallBack(converter, UCNV_TO_U_CALLBACK_STOP, nullptr, nullptr,
|
||
|
|
nullptr, status);
|
||
|
|
break;
|
||
|
|
case OnStringConversionError::SKIP:
|
||
|
|
ucnv_setToUCallBack(converter, UCNV_TO_U_CALLBACK_SKIP, nullptr, nullptr,
|
||
|
|
nullptr, status);
|
||
|
|
break;
|
||
|
|
case OnStringConversionError::SUBSTITUTE:
|
||
|
|
ucnv_setToUCallBack(converter, ToUnicodeCallbackSubstitute, nullptr,
|
||
|
|
nullptr, nullptr, status);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
NOTREACHED();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace
|
||
|
|
|
||
|
|
// Codepage <-> Wide/UTF-16 ---------------------------------------------------
|
||
|
|
|
||
|
|
bool UTF16ToCodepage(base::StringPiece16 utf16,
|
||
|
|
const char* codepage_name,
|
||
|
|
OnStringConversionError::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, on_error, encoded);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool CodepageToUTF16(base::StringPiece encoded,
|
||
|
|
const char* codepage_name,
|
||
|
|
OnStringConversionError::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);
|
||
|
|
std::unique_ptr<char16[]> buffer(new char16[uchar_max_length]);
|
||
|
|
int actual_size = ucnv_toUChars(converter, buffer.get(),
|
||
|
|
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->assign(buffer.get(), actual_size);
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ConvertToUtf8AndNormalize(base::StringPiece text,
|
||
|
|
const std::string& charset,
|
||
|
|
std::string* result) {
|
||
|
|
result->clear();
|
||
|
|
string16 utf16;
|
||
|
|
if (!CodepageToUTF16(text, charset.c_str(), OnStringConversionError::FAIL,
|
||
|
|
&utf16))
|
||
|
|
return false;
|
||
|
|
|
||
|
|
UErrorCode status = U_ZERO_ERROR;
|
||
|
|
const icu::Normalizer2* normalizer = icu::Normalizer2::getNFCInstance(status);
|
||
|
|
DCHECK(U_SUCCESS(status));
|
||
|
|
if (U_FAILURE(status))
|
||
|
|
return false;
|
||
|
|
int32_t utf16_length = static_cast<int32_t>(utf16.length());
|
||
|
|
icu::UnicodeString normalized(utf16.data(), utf16_length);
|
||
|
|
int32_t normalized_prefix_length =
|
||
|
|
normalizer->spanQuickCheckYes(normalized, status);
|
||
|
|
if (normalized_prefix_length < utf16_length) {
|
||
|
|
icu::UnicodeString un_normalized(normalized, normalized_prefix_length);
|
||
|
|
normalized.truncate(normalized_prefix_length);
|
||
|
|
normalizer->normalizeSecondAndAppend(normalized, un_normalized, status);
|
||
|
|
}
|
||
|
|
if (U_FAILURE(status))
|
||
|
|
return false;
|
||
|
|
normalized.toUTF8String(*result);
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace base
|