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// Copyright (c) 2010 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/strings/utf_string_conversions.h"
#include <stdint.h>
#include "base/strings/string_piece.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversion_utils.h"
#include "build/build_config.h"
namespace base {
namespace {
// 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) {
// ICU requires 32-bit numbers.
bool success = true;
int32_t src_len32 = static_cast<int32_t>(src_len);
for (int32_t i = 0; i < src_len32; i++) {
uint32_t code_point;
if (ReadUnicodeCharacter(src, src_len32, &i, &code_point)) {
WriteUnicodeCharacter(code_point, output);
} else {
WriteUnicodeCharacter(0xFFFD, output);
success = false;
}
}
return success;
}
} // namespace
// UTF-8 <-> Wide --------------------------------------------------------------
bool WideToUTF8(const wchar_t* src, size_t src_len, std::string* output) {
if (IsStringASCII(std::wstring(src, src_len))) {
output->assign(src, src + src_len);
return true;
} else {
PrepareForUTF8Output(src, src_len, output);
return ConvertUnicode(src, src_len, output);
}
}
std::string WideToUTF8(const std::wstring& wide) {
if (IsStringASCII(wide)) {
return std::string(wide.data(), wide.data() + wide.length());
}
std::string ret;
PrepareForUTF8Output(wide.data(), wide.length(), &ret);
ConvertUnicode(wide.data(), wide.length(), &ret);
return ret;
}
bool UTF8ToWide(const char* src, size_t src_len, std::wstring* output) {
if (IsStringASCII(StringPiece(src, src_len))) {
output->assign(src, src + src_len);
return true;
} else {
PrepareForUTF16Or32Output(src, src_len, output);
return ConvertUnicode(src, src_len, output);
}
}
std::wstring UTF8ToWide(StringPiece utf8) {
if (IsStringASCII(utf8)) {
return std::wstring(utf8.begin(), utf8.end());
}
std::wstring ret;
PrepareForUTF16Or32Output(utf8.data(), utf8.length(), &ret);
ConvertUnicode(utf8.data(), utf8.length(), &ret);
return ret;
}
// UTF-16 <-> Wide -------------------------------------------------------------
#if defined(WCHAR_T_IS_UTF16)
// When wide == UTF-16, then conversions are a NOP.
bool WideToUTF16(const wchar_t* src, size_t src_len, string16* output) {
output->assign(src, src_len);
return true;
}
string16 WideToUTF16(const std::wstring& wide) {
return wide;
}
bool UTF16ToWide(const char16* src, size_t src_len, std::wstring* output) {
output->assign(src, src_len);
return true;
}
std::wstring UTF16ToWide(const string16& utf16) {
return utf16;
}
#elif defined(WCHAR_T_IS_UTF32)
bool WideToUTF16(const wchar_t* src, size_t src_len, string16* output) {
output->clear();
// Assume that normally we won't have any non-BMP characters so the counts
// will be the same.
output->reserve(src_len);
return ConvertUnicode(src, src_len, output);
}
string16 WideToUTF16(const std::wstring& wide) {
string16 ret;
WideToUTF16(wide.data(), wide.length(), &ret);
return ret;
}
bool UTF16ToWide(const char16* src, size_t src_len, std::wstring* output) {
output->clear();
// Assume that normally we won't have any non-BMP characters so the counts
// will be the same.
output->reserve(src_len);
return ConvertUnicode(src, src_len, output);
}
std::wstring UTF16ToWide(const string16& utf16) {
std::wstring ret;
UTF16ToWide(utf16.data(), utf16.length(), &ret);
return ret;
}
#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 (IsStringASCII(StringPiece(src, src_len))) {
output->assign(src, src + src_len);
return true;
} else {
PrepareForUTF16Or32Output(src, src_len, output);
return ConvertUnicode(src, src_len, output);
}
}
string16 UTF8ToUTF16(StringPiece utf8) {
if (IsStringASCII(utf8)) {
return string16(utf8.begin(), utf8.end());
}
string16 ret;
PrepareForUTF16Or32Output(utf8.data(), utf8.length(), &ret);
// Ignore the success flag of this call, it will do the best it can for
// invalid input, which is what we want here.
ConvertUnicode(utf8.data(), utf8.length(), &ret);
return ret;
}
bool UTF16ToUTF8(const char16* src, size_t src_len, std::string* output) {
if (IsStringASCII(StringPiece16(src, src_len))) {
output->assign(src, src + src_len);
return true;
} else {
PrepareForUTF8Output(src, src_len, output);
return ConvertUnicode(src, src_len, output);
}
}
std::string UTF16ToUTF8(StringPiece16 utf16) {
if (IsStringASCII(utf16)) {
return std::string(utf16.begin(), utf16.end());
}
std::string 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(StringPiece 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(StringPiece16 utf16) {
if (IsStringASCII(utf16))
return std::string(utf16.data(), utf16.data() + utf16.length());
std::string ret;
PrepareForUTF8Output(utf16.data(), utf16.length(), &ret);
ConvertUnicode(utf16.data(), utf16.length(), &ret);
return ret;
}
#endif
string16 ASCIIToUTF16(StringPiece ascii) {
DCHECK(IsStringASCII(ascii)) << ascii;
return string16(ascii.begin(), ascii.end());
}
std::string UTF16ToASCII(StringPiece16 utf16) {
DCHECK(IsStringASCII(utf16)) << UTF16ToUTF8(utf16);
return std::string(utf16.begin(), utf16.end());
}
} // namespace base
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