charset.h

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/*
 * charset.h - header file for general character set conversion
 * routines.
 */

#ifndef charset_charset_h
#define charset_charset_h

#include <stddef.h>

/*
 * Enumeration that lists all the multibyte or single-byte
 * character sets known to this library.
 */
typedef enum {
    CS_NONE,			       /* used for reporting errors, etc */
    CS_ISO8859_1,
    CS_ISO8859_1_X11,		       /* X font encoding with VT100 glyphs */
    CS_ISO8859_2,
    CS_ISO8859_3,
    CS_ISO8859_4,
    CS_ISO8859_5,
    CS_ISO8859_6,
    CS_ISO8859_7,
    CS_ISO8859_8,
    CS_ISO8859_9,
    CS_ISO8859_10,
    CS_ISO8859_11,
    CS_ISO8859_13,
    CS_ISO8859_14,
    CS_ISO8859_15,
    CS_ISO8859_16,
    CS_CP437,
    CS_CP850,
    CS_CP1250,
    CS_CP1251,
    CS_CP1252,
    CS_CP1253,
    CS_CP1254,
    CS_CP1255,
    CS_CP1256,
    CS_CP1257,
    CS_CP1258,
    CS_KOI8_R,
    CS_KOI8_U,
    CS_MAC_ROMAN,
    CS_MAC_TURKISH,
    CS_MAC_CROATIAN,
    CS_MAC_ICELAND,
    CS_MAC_ROMANIAN,
    CS_MAC_GREEK,
    CS_MAC_CYRILLIC,
    CS_MAC_THAI,
    CS_MAC_CENTEURO,
    CS_MAC_SYMBOL,
    CS_MAC_DINGBATS,
    CS_MAC_ROMAN_OLD,
    CS_MAC_CROATIAN_OLD,
    CS_MAC_ICELAND_OLD,
    CS_MAC_ROMANIAN_OLD,
    CS_MAC_GREEK_OLD,
    CS_MAC_CYRILLIC_OLD,
    CS_MAC_UKRAINE,
    CS_MAC_VT100,
    CS_MAC_VT100_OLD,
    CS_VISCII,
    CS_HP_ROMAN8,
    CS_DEC_MCS,
    CS_UTF8
} charset_t;

typedef struct {
    unsigned long s0;
} charset_state;

/*
 * Routine to convert a MB/SB character set to Unicode.
 * 
 * This routine accepts some number of bytes, updates a state
 * variable, and outputs some number of Unicode characters. There
 * are no guarantees. You can't even guarantee that at most one
 * Unicode character will be output per byte you feed in; for
 * example, suppose you're reading UTF-8, you've seen E1 80, and
 * then you suddenly see FE. Now you need to output _two_ error
 * characters - one for the incomplete sequence E1 80, and one for
 * the completely invalid UTF-8 byte FE.
 * 
 * Returns the number of wide characters output; will never output
 * more than the size of the buffer (as specified on input).
 * Advances the `input' pointer and decrements `inlen', to indicate
 * how far along the input string it got.
 * 
 * The sequence of `errlen' wide characters pointed to by `errstr'
 * will be used to indicate a conversion error. If `errstr' is
 * NULL, `errlen' will be ignored, and the library will choose
 * something sensible to do on its own. For Unicode, this will be
 * U+FFFD (REPLACEMENT CHARACTER).
 */

int charset_to_unicode(char **input, int *inlen, wchar_t *output, int outlen,
		       int charset, charset_state *state,
		       const wchar_t *errstr, int errlen);

/*
 * Routine to convert Unicode to an MB/SB character set.
 * 
 * This routine accepts some number of Unicode characters, updates
 * a state variable, and outputs some number of bytes.
 * 
 * Returns the number of bytes characters output; will never output
 * more than the size of the buffer (as specified on input), and
 * will never output a partial MB character. Advances the `input'
 * pointer and decrements `inlen', to indicate how far along the
 * input string it got.
 * 
 * The sequence of `errlen' characters pointed to by `errstr' will
 * be used to indicate a conversion error. If `errstr' is NULL,
 * `errlen' will be ignored, and the library will choose something
 * sensible to do on its own (which will vary depending on the
 * output charset).
 */

int charset_from_unicode(wchar_t **input, int *inlen, char *output, int outlen,
			 int charset, charset_state *state,
			 const char *errstr, int errlen);

/*
 * Convert X11 encoding names to and from our charset identifiers.
 */
const char *charset_to_xenc(int charset);
int charset_from_xenc(const char *name);

/*
 * Convert MIME encoding names to and from our charset identifiers.
 */
const char *charset_to_mimeenc(int charset);
int charset_from_mimeenc(const char *name);

/*
 * Convert our own encoding names to and from our charset
 * identifiers.
 */
const char *charset_to_localenc(int charset);
int charset_from_localenc(const char *name);
int charset_localenc_nth(int n);

/*
 * Convert Mac OS script/region/font to our charset identifiers.
 */
int charset_from_macenc(int script, int region, int sysvers,
			const char *fontname);

#endif /* charset_charset_h */