Unicode

Data Structures
struct	t_charset_converter
	The charset_converter object. More...
Functions
t_max_err	charset_convert (t_symbol *src_encoding, const char *in, long inbytes, t_symbol *dest_encoding, char **out, long *outbytes)
	A convenience function that simplifies usage by wrapping the other charset functions.
unsigned short *	charset_utf8tounicode (char *s, long *outlen)
	Convert a UTF8 C-String into a 16-bit-wide-character array.
char *	charset_unicodetoutf8 (unsigned short *s, long len, long *outlen)
	Convert a 16-bit-wide-character array into a UTF C-string.
long	charset_utf8_count (char *utf8, long *bytecount)
	Returns utf8 character count, and optionally bytecount.
char *	charset_utf8_offset (char *utf8, long charoffset, long *byteoffset)
	Returns utf8 character offset (positive or negative), and optionally byte offset.

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Detailed Description

Character Encodings

Currently supported character encodings

• _sym_utf_8; // utf-8, no bom
• _sym_utf_16; // utf-16, big-endian
• _sym_utf_16be; // utf-16, big-endian
• _sym_utf_16le; // utf-16, little-endian
• _sym_iso_8859_1; // iso-8859-1 (latin-1)
• _sym_us_ascii; // us-ascii 7-bit
• _sym_ms_ansi; // ms-ansi (microsoft code page 1252)
• _sym_macroman; // mac roman
• _sym_charset_converter;
• _sym_convert;

Example Usage

    t_charset_converter *conv = object_new(CLASS_NOBOX, gensym("charset_converter"), ps_macroman, ps_ms_ansi);
    char *cstr = "Text to convert";
    char *cvtbuffer = NULL; // to-be-allocated data buffer
    long cvtbuflen = 0; // length of buffer on output

    if (conv) {
        // note that it isn't necessary to send in a 0-terminated string, although we do so here
        if (object_method(conv, gensym("convert"), cstr, strlen(cstr) + 1, &cvtbuffer, &cvtbuflen) == ERR_NONE) {
            // do something with the converted buffer
            sysmem_freeptr(cvtbuffer); // free newly allocated data buffer
        }
        object_free(conv); // free converter
    }

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Function Documentation

t_max_err charset_convert	(	t_symbol *	src_encoding,
		const char *	in,
		long	inbytes,
		t_symbol *	dest_encoding,
		char **	out,
		long *	outbytes
	)

A convenience function that simplifies usage by wrapping the other charset functions.

Parameters:

src_encoding	The name encoding of the input.
in	The input string.
inbytes	The number of bytes in the input string.
dest_encoding	The name of the encoding to use for the output.
out	The address of a char*, which will be allocated and filled with the string in the new encoding.
outbytes	The address of a value that will hold the number of bytes long the output is upon return.

Returns:

A Max error code.

Remarks:

Remember to call sysmem_freeptr(*out) to free any allocated memory.

char* charset_unicodetoutf8	(	unsigned short *	s,
		long	len,
		long *	outlen
	)

Convert a 16-bit-wide-character array into a UTF C-string.

Accepts either null termination, or not (len is zero in the latter case).

Parameters:

s	An array of wide (16-bit) unicode characters.
len	The length of s.
outlen	The address of a variable to hold the size of the number of chars but does not include the NULL terminator in the count.

Returns:

A UTF8-encoded C-string.

long charset_utf8_count	(	char *	utf8,
		long *	bytecount
	)

Returns utf8 character count, and optionally bytecount.

Parameters:

utf8	The UTF-8 encoded string whose characters are to be counted.
bytecount	The address of a variable to hold the byte count on return. Pass NULL if you don't require the byte count.

Returns:

The number of characters in the UTF8 string.

char* charset_utf8_offset	(	char *	utf8,
		long	charoffset,
		long *	byteoffset
	)

Returns utf8 character offset (positive or negative), and optionally byte offset.

Parameters:

utf8	A UTF-8 encoded string.
charoffset	The char offset into the string at which to find the byte offset.
byteoffset	The address of a variable to hold the byte offset on return. Pass NULL if you don't require the byte offset.

Returns:

The character offset.

unsigned short* charset_utf8tounicode	(	char *	s,
		long *	outlen
	)

Convert a UTF8 C-String into a 16-bit-wide-character array.

Parameters:

s	The string to be converted to unicode.
outlen	The address of a variable to hold the size of the number of chars but does not include the NULL terminator in the count.

Returns:

A pointer to the buffer of unicode (wide) characters.