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// 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.
#ifndef BASE_I18N_ICU_STRING_CONVERSIONS_H_
#define BASE_I18N_ICU_STRING_CONVERSIONS_H_
#include <string>
#include "base/string16.h"
#include "base/string_piece.h"
namespace base {
// Defines the error handling modes of UTF16ToCodepage, CodepageToUTF16,
// WideToCodepage and CodepageToWide.
class OnStringConversionError {
public:
enum Type {
// The function will return failure. The output buffer will be empty.
FAIL,
// The offending characters are skipped and the conversion will proceed as
// if they did not exist.
SKIP,
// When converting to Unicode, the offending byte sequences are substituted
// by Unicode replacement character (U+FFFD). When converting from Unicode,
// this is the same as SKIP.
SUBSTITUTE,
};
private:
OnStringConversionError();
};
// Names of codepages (charsets) understood by icu.
extern const char kCodepageLatin1[]; // a.k.a. ISO 8859-1
extern const char kCodepageUTF8[];
extern const char kCodepageUTF16BE[];
extern const char kCodepageUTF16LE[];
// Like CodepageToUTF16() (see below), but also takes an offset into |encoded|,
// which will be adjusted to point at the same logical place in |utf16|. If
// this isn't possible because it points past the end of |encoded| or into the
// middle of a multibyte sequence, it will be set to std::string16::npos.
// |offset_for_adjustment| may be NULL.
bool CodepageToUTF16AndAdjustOffset(const std::string& encoded,
const char* codepage_name,
OnStringConversionError::Type on_error,
string16* utf16,
size_t* offset_for_adjustment);
// Converts between UTF-16 strings and the encoding specified. If the
// encoding doesn't exist or the encoding fails (when on_error is FAIL),
// returns false.
bool UTF16ToCodepage(const string16& utf16,
const char* codepage_name,
OnStringConversionError::Type on_error,
std::string* encoded);
inline bool CodepageToUTF16(const std::string& encoded,
const char* codepage_name,
OnStringConversionError::Type on_error,
string16* utf16) {
return CodepageToUTF16AndAdjustOffset(encoded, codepage_name, on_error, utf16,
NULL);
}
// Like CodepageToWide() (see below), but also takes an offset into |encoded|,
// which will be adjusted to point at the same logical place in |wide|. If
// this isn't possible because it points past the end of |encoded| or into the
// middle of a multibyte sequence, it will be set to std::wstring::npos.
// |offset_for_adjustment| may be NULL.
bool CodepageToWideAndAdjustOffset(const std::string& encoded,
const char* codepage_name,
OnStringConversionError::Type on_error,
std::wstring* wide,
size_t* offset_for_adjustment);
// Converts between wide strings and the encoding specified. If the
// encoding doesn't exist or the encoding fails (when on_error is FAIL),
// returns false.
bool WideToCodepage(const std::wstring& wide,
const char* codepage_name,
OnStringConversionError::Type on_error,
std::string* encoded);
inline bool CodepageToWide(const std::string& encoded,
const char* codepage_name,
OnStringConversionError::Type on_error,
std::wstring* wide) {
return CodepageToWideAndAdjustOffset(encoded, codepage_name, on_error, wide,
NULL);
}
} // namespace base
#endif // BASE_I18N_ICU_STRING_CONVERSIONS_H_
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