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/**
* File: CharsetConv.h
* Project: libvdr - classes taken from vdr-project
*
* from "Video Disk Recorder":
*
* Copyright (C) 2000, 2003, 2006, 2008 Klaus Schmidinger
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* Or, point your browser to http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
*
* The original author can be reached at kls@tvdr.de
*
* The vdr project's page is at http://www.tvdr.de
*
*/
#ifndef CHARSETCONV_H
#define CHARSETCONV_H
#include <stddef.h>
#include <sys/types.h>
#include <iconv.h>
typedef unsigned char uchar;
// When handling strings that might contain UTF-8 characters, it may be necessary
// to process a "symbol" that consists of several actual character bytes. The
// following functions allow transparently accessing a "char *" string without
// having to worry about what character set is actually used.
int Utf8CharLen(const char *s);
///< Returns the number of character bytes at the beginning of the given
///< string that form a UTF-8 symbol.
uint Utf8CharGet(const char *s, int Length = 0);
///< Returns the UTF-8 symbol at the beginning of the given string.
///< Length can be given from a previous call to Utf8CharLen() to avoid calculating
///< it again. If no Length is given, Utf8CharLen() will be called.
int Utf8CharSet(uint c, char *s = NULL);
///< Converts the given UTF-8 symbol to a sequence of character bytes and copies
///< them to the given string. Returns the number of bytes written. If no string
///< is given, only the number of bytes is returned and nothing is copied.
int Utf8SymChars(const char *s, int Symbols);
///< Returns the number of character bytes at the beginning of the given
///< string that form at most the given number of UTF-8 symbols.
int Utf8StrLen(const char *s);
///< Returns the number of UTF-8 symbols formed by the given string of
///< character bytes.
char *Utf8Strn0Cpy(char *Dest, const char *Src, int n);
///< Copies at most n character bytes from Src to Dest, making sure that the
///< resulting copy ends with a complete UTF-8 symbol. The copy is guaranteed
///< to be zero terminated.
///< Returns a pointer to Dest.
int Utf8ToArray(const char *s, uint *a, int Size);
///< Converts the given character bytes (including the terminating 0) into an
///< array of UTF-8 symbols of the given Size. Returns the number of symbols
///< in the array (without the terminating 0).
int Utf8FromArray(const uint *a, char *s, int Size, int Max = -1);
///< Converts the given array of UTF-8 symbols (including the terminating 0)
///< into a sequence of character bytes of at most Size length. Returns the
///< number of character bytes written (without the terminating 0).
///< If Max is given, only that many symbols will be converted.
///< The resulting string is always zero-terminated if Size is big enough.
// When allocating buffer space, make sure we reserve enough space to hold
// a string in UTF-8 representation:
#define Utf8BufSize(s) ((s) * 4)
// The following macros automatically use the correct versions of the character
// class functions:
#define Utf8to(conv, c) (cCharSetConv::SystemCharacterTable() ? to##conv(c) : tow##conv(c))
#define Utf8is(ccls, c) (cCharSetConv::SystemCharacterTable() ? is##ccls(c) : isw##ccls(c))
class cCharSetConv {
public:
cCharSetConv(const char *FromCode = NULL, const char *ToCode = NULL);
///< Sets up a character set converter to convert from FromCode to ToCode.
///< If FromCode is NULL, the previously set systemCharacterTable is used
///< (or "UTF-8" if no systemCharacterTable has been set).
///< If ToCode is NULL, "UTF-8" is used.
~cCharSetConv();
const char *Convert(const char *From, char *To = NULL, size_t ToLength = 0);
///< Converts the given Text from FromCode to ToCode (as set in the constructor).
///< If To is given, it is used to copy at most ToLength bytes of the result
///< (including the terminating 0) into that buffer. If To is not given,
///< the result is copied into a dynamically allocated buffer and is valid as
///< long as this object lives, or until the next call to Convert(). The
///< return value always points to the result if the conversion was successful
///< (even if a fixed size To buffer was given and the result didn't fit into
///< it). If the string could not be converted, the result points to the
///< original From string.
static const char *SystemCharacterTable(void) { return systemCharacterTable; }
static void SetSystemCharacterTable(const char *CharacterTable);
private:
iconv_t cd;
char *result;
size_t length;
static char *systemCharacterTable;
};
#endif /* CHARSETCONV_H */
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