src/stdlib/SDL_iconv.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 13 Mar 2006 01:17:22 +0000
changeset 1503 5e4dad24a5de
parent 1502 d403a39389da
child 1510 720f8bb49d7d
permissions -rw-r--r--
props yo
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* This file contains portable iconv functions for SDL */
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#include "SDL_stdinc.h"
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#include "SDL_endian.h"
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#ifdef HAVE_ICONV
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#include <errno.h>
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size_t SDL_iconv(SDL_iconv_t cd,
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                 char **inbuf, size_t *inbytesleft,
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                 char **outbuf, size_t *outbytesleft)
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{
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	size_t retCode = iconv(cd, inbuf, inbytesleft, outbuf, outbytesleft);
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	if ( retCode == (size_t)-1 ) {
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		switch(errno) {
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		    case E2BIG:
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			return SDL_ICONV_E2BIG;
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		    case EILSEQ:
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			return SDL_ICONV_EILSEQ;
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		    case EINVAL:
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			return SDL_ICONV_EINVAL;
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		    default:
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			return SDL_ICONV_ERROR;
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		}
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	}
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	return retCode;
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}
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#else
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/* Lots of useful information on Unicode at:
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	http://www.cl.cam.ac.uk/~mgk25/unicode.html
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*/
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#define UNICODE_BOM	0xFEFF
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#define UNKNOWN_ASCII	'?'
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#define UNKNOWN_UNICODE	0xFFFD
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enum {
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	ENCODING_UNKNOWN,
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	ENCODING_ASCII,
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	ENCODING_LATIN1,
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	ENCODING_UTF8,
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	ENCODING_UTF16,		/* Needs byte order marker */
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	ENCODING_UTF16BE,
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	ENCODING_UTF16LE,
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	ENCODING_UTF32,		/* Needs byte order marker */
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	ENCODING_UTF32BE,
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	ENCODING_UTF32LE,
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	ENCODING_UCS2,		/* Native byte order assumed */
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	ENCODING_UCS4,		/* Native byte order assumed */
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};
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#if SDL_BYTEORDER == SDL_BIG_ENDIAN
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#define ENCODING_UTF16NATIVE	ENCODING_UTF16BE
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#define ENCODING_UTF32NATIVE	ENCODING_UTF32BE
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#else
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#define ENCODING_UTF16NATIVE	ENCODING_UTF16LE
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#define ENCODING_UTF32NATIVE	ENCODING_UTF32LE
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#endif
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struct _SDL_iconv_t
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{
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	int src_fmt;
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	int dst_fmt;
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};
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static struct {
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	const char *name;
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	int format;
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} encodings[] = {
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	{ "ASCII",	ENCODING_ASCII },
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	{ "US-ASCII",	ENCODING_ASCII },
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	{ "LATIN1",	ENCODING_LATIN1 },
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	{ "ISO-8859-1",	ENCODING_LATIN1 },
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	{ "UTF8",	ENCODING_UTF8 },
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	{ "UTF-8",	ENCODING_UTF8 },
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	{ "UTF16",	ENCODING_UTF16 },
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	{ "UTF-16",	ENCODING_UTF16 },
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	{ "UTF16BE",	ENCODING_UTF16BE },
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	{ "UTF-16BE",	ENCODING_UTF16BE },
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	{ "UTF16LE",	ENCODING_UTF16LE },
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	{ "UTF-16LE",	ENCODING_UTF16LE },
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	{ "UTF32",	ENCODING_UTF32 },
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	{ "UTF-32",	ENCODING_UTF32 },
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	{ "UTF32BE",	ENCODING_UTF32BE },
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	{ "UTF-32BE",	ENCODING_UTF32BE },
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	{ "UTF32LE",	ENCODING_UTF32LE },
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	{ "UTF-32LE",	ENCODING_UTF32LE },
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	{ "UCS2",	ENCODING_UCS2 },
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	{ "UCS-2",	ENCODING_UCS2 },
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	{ "UCS4",	ENCODING_UCS4 },
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	{ "UCS-4",	ENCODING_UCS4 },
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};
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SDL_iconv_t SDL_iconv_open(const char *tocode, const char *fromcode)
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{
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	int src_fmt = ENCODING_UNKNOWN;
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	int dst_fmt = ENCODING_UNKNOWN;
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	int i;
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	for ( i = 0; i < SDL_arraysize(encodings); ++i ) {
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		if ( SDL_strcasecmp(fromcode, encodings[i].name) == 0 ) {
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			src_fmt = encodings[i].format;
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			if ( dst_fmt != ENCODING_UNKNOWN ) {
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				break;
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			}
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		}
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		if ( SDL_strcasecmp(tocode, encodings[i].name) == 0 ) {
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			dst_fmt = encodings[i].format;
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			if ( src_fmt != ENCODING_UNKNOWN ) {
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				break;
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			}
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		}
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	}
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	if ( src_fmt != ENCODING_UNKNOWN && dst_fmt != ENCODING_UNKNOWN ) {
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		SDL_iconv_t cd = (SDL_iconv_t)SDL_malloc(sizeof(*cd));
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		if ( cd ) {
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			cd->src_fmt = src_fmt;
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			cd->dst_fmt = dst_fmt;
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			return cd;
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		}
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	}
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	return (SDL_iconv_t)-1;
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}
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size_t SDL_iconv(SDL_iconv_t cd,
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                 char **inbuf, size_t *inbytesleft,
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                 char **outbuf, size_t *outbytesleft)
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{
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	/* For simplicity, we'll convert everything to and from UCS-4 */
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	char *src, *dst;
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	size_t srclen, dstlen;
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	Uint32 ch;
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	size_t total;
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	if ( !inbuf || !*inbuf ) {
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		/* Reset the context */
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		return 0;
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	}
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	if ( !outbuf || !*outbuf || !outbytesleft || !*outbytesleft ) {
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		return SDL_ICONV_E2BIG;
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	}
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	src = *inbuf;
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	srclen = (inbytesleft ? *inbytesleft : 0);
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	dst = *outbuf;
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	dstlen = *outbytesleft;
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	switch ( cd->src_fmt ) {
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	    case ENCODING_UTF16:
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		/* Scan for a byte order marker */
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		{
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			Uint8 *p = (Uint8 *)src;
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			size_t n = srclen / 2;
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			while ( n ) {
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				if ( p[0] == 0xFF && p[1] == 0xFE ) {
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					cd->src_fmt = ENCODING_UTF16BE;
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					break;
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				} else if ( p[0] == 0xFE && p[1] == 0xFF ) {
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					cd->src_fmt = ENCODING_UTF16LE;
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					break;
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				}
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				p += 2;
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				--n;
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			}
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			if ( n == 0 ) {
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				/* We can't tell, default to host order */
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				cd->src_fmt = ENCODING_UTF16NATIVE;
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			}
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		}
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		break;
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	    case ENCODING_UTF32:
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		/* Scan for a byte order marker */
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		{
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			Uint8 *p = (Uint8 *)src;
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			size_t n = srclen / 4;
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			while ( n ) {
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				if ( p[0] == 0xFF && p[1] == 0xFE &&
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				     p[2] == 0x00 && p[3] == 0x00 ) {
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					cd->src_fmt = ENCODING_UTF32BE;
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					break;
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				} else if ( p[0] == 0x00 && p[1] == 0x00 &&
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				            p[2] == 0xFE && p[3] == 0xFF ) {
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					cd->src_fmt = ENCODING_UTF32LE;
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					break;
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				}
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				p += 4;
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				--n;
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			}
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			if ( n == 0 ) {
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				/* We can't tell, default to host order */
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				cd->src_fmt = ENCODING_UTF32NATIVE;
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			}
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		}
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		break;
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	}
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	switch ( cd->dst_fmt ) {
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	    case ENCODING_UTF16:
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		/* Default to host order, need to add byte order marker */
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		if ( dstlen < 2 ) {
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			return SDL_ICONV_E2BIG;
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		}
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		*(Uint16 *)dst = UNICODE_BOM;
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		dst += 2;
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		dstlen -= 2;
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		cd->dst_fmt = ENCODING_UTF16NATIVE;
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		break;
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	    case ENCODING_UTF32:
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		/* Default to host order, need to add byte order marker */
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		if ( dstlen < 4 ) {
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			return SDL_ICONV_E2BIG;
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		}
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		*(Uint32 *)dst = UNICODE_BOM;
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		dst += 4;
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		dstlen -= 4;
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		cd->dst_fmt = ENCODING_UTF32NATIVE;
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		break;
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	}
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	total = 0;
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	while ( srclen > 0 ) {
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		/* Decode a character */
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		switch ( cd->src_fmt ) {
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		    case ENCODING_ASCII:
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			{
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				Uint8 *p = (Uint8 *)src;
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				ch = (Uint32)(p[0] & 0x7F);
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				++src;
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				--srclen;
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			}
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			break;
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		    case ENCODING_LATIN1:
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			{
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				Uint8 *p = (Uint8 *)src;
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				ch = (Uint32)p[0];
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				++src;
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				--srclen;
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			}
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			break;
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		    case ENCODING_UTF8: /* RFC 3629 */
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			{
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				Uint8 *p = (Uint8 *)src;
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				size_t left = 0;
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				SDL_bool overlong = SDL_FALSE;
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				if ( p[0] >= 0xFC ) {
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					if ( (p[0] & 0xFE) != 0xFC ) {
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						/* Skip illegal sequences
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						return SDL_ICONV_EILSEQ;
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						*/
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						ch = UNKNOWN_UNICODE;
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					} else {
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						if ( p[0] == 0xFC ) {
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							overlong = SDL_TRUE;
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						}
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						ch = (Uint32)(p[0] & 0x01);
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						left = 5;
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					}
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				} else if ( p[0] >= 0xF8 ) {
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					if ( (p[0] & 0xFC) != 0xF8 ) {
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						/* Skip illegal sequences
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						return SDL_ICONV_EILSEQ;
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						*/
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						ch = UNKNOWN_UNICODE;
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					} else {
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						if ( p[0] == 0xF8 ) {
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							overlong = SDL_TRUE;
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						}
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						ch = (Uint32)(p[0] & 0x03);
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						left = 4;
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					}
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   296
				} else if ( p[0] >= 0xF0 ) {
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   297
					if ( (p[0] & 0xF8) != 0xF0 ) {
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						/* Skip illegal sequences
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						return SDL_ICONV_EILSEQ;
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						*/
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						ch = UNKNOWN_UNICODE;
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   302
					} else {
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						if ( p[0] == 0xF0 ) {
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							overlong = SDL_TRUE;
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						}
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   306
						ch = (Uint32)(p[0] & 0x07);
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						left = 3;
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					}
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   309
				} else if ( p[0] >= 0xE0 ) {
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					if ( (p[0] & 0xF0) != 0xE0 ) {
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						/* Skip illegal sequences
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						return SDL_ICONV_EILSEQ;
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						*/
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   314
						ch = UNKNOWN_UNICODE;
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   315
					} else {
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   316
						if ( p[0] == 0xE0 ) {
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							overlong = SDL_TRUE;
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   318
						}
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   319
						ch = (Uint32)(p[0] & 0x0F);
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   320
						left = 2;
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   321
					}
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   322
				} else if ( p[0] >= 0xC0 ) {
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   323
					if ( (p[0] & 0xE0) != 0xC0 ) {
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						/* Skip illegal sequences
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						return SDL_ICONV_EILSEQ;
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						*/
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						ch = UNKNOWN_UNICODE;
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   328
					} else {
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   329
						if ( (p[0] & 0xCE) == 0xC0 ) {
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							overlong = SDL_TRUE;
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   331
						}
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   332
						ch = (Uint32)(p[0] & 0x1F);
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   333
						left = 1;
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   334
					}
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   335
				} else {
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   336
					if ( (p[0] & 0x80) != 0x00 ) {
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   337
						/* Skip illegal sequences
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   338
						return SDL_ICONV_EILSEQ;
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   339
						*/
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   340
						ch = UNKNOWN_UNICODE;
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   341
					} else {
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   342
						ch = (Uint32)p[0];
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   343
					}
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   344
				}
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				++src;
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				--srclen;
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   347
				if ( srclen < left ) {
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   348
					return SDL_ICONV_EINVAL;
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   349
				}
slouken@1501
   350
				while ( left-- ) {
slouken@1501
   351
					++p;
slouken@1501
   352
					if ( (p[0] & 0xC0) != 0x80 ) {
slouken@1501
   353
						/* Skip illegal sequences
slouken@1501
   354
						return SDL_ICONV_EILSEQ;
slouken@1501
   355
						*/
slouken@1501
   356
						ch = UNKNOWN_UNICODE;
slouken@1501
   357
						break;
slouken@1501
   358
					}
slouken@1501
   359
					ch <<= 6;
slouken@1501
   360
					ch |= (p[0] & 0x3F);
slouken@1501
   361
					++src;
slouken@1501
   362
					--srclen;
slouken@1501
   363
				}
slouken@1501
   364
				if ( overlong ) {
slouken@1501
   365
					/* Potential security risk
slouken@1501
   366
					return SDL_ICONV_EILSEQ;
slouken@1501
   367
					*/
slouken@1501
   368
					ch = UNKNOWN_UNICODE;
slouken@1501
   369
				}
slouken@1501
   370
				if ( (ch >= 0xD800 && ch <= 0xDFFF) ||
slouken@1501
   371
				     (ch == 0xFFFE || ch == 0xFFFF) ) {
slouken@1501
   372
					/* Skip illegal sequences
slouken@1501
   373
					return SDL_ICONV_EILSEQ;
slouken@1501
   374
					*/
slouken@1501
   375
					ch = UNKNOWN_UNICODE;
slouken@1501
   376
				}
slouken@1501
   377
			}
slouken@1501
   378
			break;
slouken@1501
   379
		    case ENCODING_UTF16BE: /* RFC 2781 */
slouken@1501
   380
			{
slouken@1501
   381
				Uint8 *p = (Uint8 *)src;
slouken@1501
   382
				Uint16 W1, W2;
slouken@1501
   383
				if ( srclen < 2 ) {
slouken@1501
   384
					return SDL_ICONV_EINVAL;
slouken@1501
   385
				}
slouken@1501
   386
				W1 = ((Uint32)p[0] << 8) |
slouken@1501
   387
				      (Uint32)p[1];
slouken@1501
   388
				src += 2;
slouken@1501
   389
				srclen -= 2;
slouken@1501
   390
				if ( W1 < 0xD800 || W1 > 0xDFFF ) {
slouken@1501
   391
					ch = (Uint32)W1;
slouken@1501
   392
					break;
slouken@1501
   393
				}
slouken@1501
   394
				if ( W1 > 0xDBFF ) {
slouken@1501
   395
					/* Skip illegal sequences
slouken@1501
   396
					return SDL_ICONV_EILSEQ;
slouken@1501
   397
					*/
slouken@1501
   398
					ch = UNKNOWN_UNICODE;
slouken@1501
   399
					break;
slouken@1501
   400
				}
slouken@1501
   401
				if ( srclen < 2 ) {
slouken@1501
   402
					return SDL_ICONV_EINVAL;
slouken@1501
   403
				}
slouken@1501
   404
				p = src;
slouken@1501
   405
				W2 = ((Uint32)p[0] << 8) |
slouken@1501
   406
				      (Uint32)p[1];
slouken@1501
   407
				src += 2;
slouken@1501
   408
				srclen -= 2;
slouken@1501
   409
				if ( W2 < 0xDC00 || W2 > 0xDFFF ) {
slouken@1501
   410
					/* Skip illegal sequences
slouken@1501
   411
					return SDL_ICONV_EILSEQ;
slouken@1501
   412
					*/
slouken@1501
   413
					ch = UNKNOWN_UNICODE;
slouken@1501
   414
					break;
slouken@1501
   415
				}
slouken@1501
   416
				ch = (((Uint32)(W1 & 0x3FF) << 10) |
slouken@1501
   417
				      (Uint32)(W2 & 0x3FF)) + 0x10000;
slouken@1501
   418
			}
slouken@1501
   419
			break;
slouken@1501
   420
		    case ENCODING_UTF16LE: /* RFC 2781 */
slouken@1501
   421
			{
slouken@1501
   422
				Uint8 *p = (Uint8 *)src;
slouken@1501
   423
				Uint16 W1, W2;
slouken@1501
   424
				if ( srclen < 2 ) {
slouken@1501
   425
					return SDL_ICONV_EINVAL;
slouken@1501
   426
				}
slouken@1501
   427
				W1 = ((Uint32)p[1] << 8) |
slouken@1501
   428
				      (Uint32)p[0];
slouken@1501
   429
				src += 2;
slouken@1501
   430
				srclen -= 2;
slouken@1501
   431
				if ( W1 < 0xD800 || W1 > 0xDFFF ) {
slouken@1501
   432
					ch = (Uint32)W1;
slouken@1501
   433
					break;
slouken@1501
   434
				}
slouken@1501
   435
				if ( W1 > 0xDBFF ) {
slouken@1501
   436
					/* Skip illegal sequences
slouken@1501
   437
					return SDL_ICONV_EILSEQ;
slouken@1501
   438
					*/
slouken@1501
   439
					ch = UNKNOWN_UNICODE;
slouken@1501
   440
					break;
slouken@1501
   441
				}
slouken@1501
   442
				if ( srclen < 2 ) {
slouken@1501
   443
					return SDL_ICONV_EINVAL;
slouken@1501
   444
				}
slouken@1501
   445
				p = src;
slouken@1501
   446
				W2 = ((Uint32)p[1] << 8) |
slouken@1501
   447
				      (Uint32)p[0];
slouken@1501
   448
				src += 2;
slouken@1501
   449
				srclen -= 2;
slouken@1501
   450
				if ( W2 < 0xDC00 || W2 > 0xDFFF ) {
slouken@1501
   451
					/* Skip illegal sequences
slouken@1501
   452
					return SDL_ICONV_EILSEQ;
slouken@1501
   453
					*/
slouken@1501
   454
					ch = UNKNOWN_UNICODE;
slouken@1501
   455
					break;
slouken@1501
   456
				}
slouken@1501
   457
				ch = (((Uint32)(W1 & 0x3FF) << 10) |
slouken@1501
   458
				      (Uint32)(W2 & 0x3FF)) + 0x10000;
slouken@1501
   459
			}
slouken@1501
   460
			break;
slouken@1501
   461
		    case ENCODING_UTF32BE:
slouken@1501
   462
			{
slouken@1501
   463
				Uint8 *p = (Uint8 *)src;
slouken@1501
   464
				if ( srclen < 4 ) {
slouken@1501
   465
					return SDL_ICONV_EINVAL;
slouken@1501
   466
				}
slouken@1501
   467
				ch = ((Uint32)p[0] << 24) |
slouken@1501
   468
				     ((Uint32)p[1] << 16) |
slouken@1501
   469
				     ((Uint32)p[2] << 8) |
slouken@1501
   470
				      (Uint32)p[3];
slouken@1501
   471
				src += 4;
slouken@1501
   472
				srclen -= 4;
slouken@1501
   473
			}
slouken@1501
   474
			break;
slouken@1501
   475
		    case ENCODING_UTF32LE:
slouken@1501
   476
			{
slouken@1501
   477
				Uint8 *p = (Uint8 *)src;
slouken@1501
   478
				if ( srclen < 4 ) {
slouken@1501
   479
					return SDL_ICONV_EINVAL;
slouken@1501
   480
				}
slouken@1501
   481
				ch = ((Uint32)p[3] << 24) |
slouken@1501
   482
				     ((Uint32)p[2] << 16) |
slouken@1501
   483
				     ((Uint32)p[1] << 8) |
slouken@1501
   484
				      (Uint32)p[0];
slouken@1501
   485
				src += 4;
slouken@1501
   486
				srclen -= 4;
slouken@1501
   487
			}
slouken@1501
   488
			break;
slouken@1501
   489
		    case ENCODING_UCS2:
slouken@1501
   490
			{
slouken@1501
   491
				Uint16 *p = (Uint16 *)src;
slouken@1501
   492
				if ( srclen < 2 ) {
slouken@1501
   493
					return SDL_ICONV_EINVAL;
slouken@1501
   494
				}
slouken@1501
   495
				ch = *p;
slouken@1501
   496
				src += 2;
slouken@1501
   497
				srclen -= 2;
slouken@1501
   498
			}
slouken@1501
   499
			break;
slouken@1501
   500
		    case ENCODING_UCS4:
slouken@1501
   501
			{
slouken@1501
   502
				Uint32 *p = (Uint32 *)src;
slouken@1501
   503
				if ( srclen < 4 ) {
slouken@1501
   504
					return SDL_ICONV_EINVAL;
slouken@1501
   505
				}
slouken@1501
   506
				ch = *p;
slouken@1501
   507
				src += 4;
slouken@1501
   508
				srclen -= 4;
slouken@1501
   509
			}
slouken@1501
   510
			break;
slouken@1501
   511
		}
slouken@1501
   512
slouken@1501
   513
		/* Encode a character */
slouken@1501
   514
		switch ( cd->dst_fmt ) {
slouken@1501
   515
		    case ENCODING_ASCII:
slouken@1501
   516
			{
slouken@1501
   517
				Uint8 *p = (Uint8 *)dst;
slouken@1501
   518
				if ( dstlen < 1 ) {
slouken@1501
   519
					return SDL_ICONV_E2BIG;
slouken@1501
   520
				}
slouken@1501
   521
				if ( ch > 0x7F ) {
slouken@1501
   522
					*p = UNKNOWN_ASCII;
slouken@1501
   523
				} else {
slouken@1501
   524
					*p = (Uint8)ch;
slouken@1501
   525
				}
slouken@1501
   526
				++dst;
slouken@1501
   527
				--dstlen;
slouken@1501
   528
			}
slouken@1501
   529
			break;
slouken@1501
   530
		    case ENCODING_LATIN1:
slouken@1501
   531
			{
slouken@1501
   532
				Uint8 *p = (Uint8 *)dst;
slouken@1501
   533
				if ( dstlen < 1 ) {
slouken@1501
   534
					return SDL_ICONV_E2BIG;
slouken@1501
   535
				}
slouken@1501
   536
				if ( ch > 0xFF ) {
slouken@1501
   537
					*p = UNKNOWN_ASCII;
slouken@1501
   538
				} else {
slouken@1501
   539
					*p = (Uint8)ch;
slouken@1501
   540
				}
slouken@1501
   541
				++dst;
slouken@1501
   542
				--dstlen;
slouken@1501
   543
			}
slouken@1501
   544
			break;
slouken@1501
   545
		    case ENCODING_UTF8: /* RFC 3629 */
slouken@1501
   546
			{
slouken@1501
   547
				Uint8 *p = (Uint8 *)dst;
slouken@1501
   548
				if ( ch > 0x7FFFFFFF ) {
slouken@1501
   549
					ch = UNKNOWN_UNICODE;
slouken@1501
   550
				}
slouken@1501
   551
				if ( ch <= 0x7F ) {
slouken@1501
   552
					if ( dstlen < 1 ) {
slouken@1501
   553
						return SDL_ICONV_E2BIG;
slouken@1501
   554
					}
slouken@1501
   555
					*p = (Uint8)ch;
slouken@1501
   556
					++dst;
slouken@1501
   557
					--dstlen;
slouken@1501
   558
				} else if ( ch <= 0x7FF ) {
slouken@1501
   559
					if ( dstlen < 2 ) {
slouken@1501
   560
						return SDL_ICONV_E2BIG;
slouken@1501
   561
					}
slouken@1501
   562
					p[0] = 0xC0 | (Uint8)((ch >> 6) & 0x1F);
slouken@1501
   563
					p[1] = 0x80 | (Uint8)(ch & 0x3F);
slouken@1501
   564
					dst += 2;
slouken@1501
   565
					dstlen -= 2;
slouken@1501
   566
				} else if ( ch <= 0xFFFF ) {
slouken@1501
   567
					if ( dstlen < 3 ) {
slouken@1501
   568
						return SDL_ICONV_E2BIG;
slouken@1501
   569
					}
slouken@1501
   570
					p[0] = 0xE0 | (Uint8)((ch >> 12) & 0x0F);
slouken@1501
   571
					p[1] = 0x80 | (Uint8)((ch >> 6) & 0x3F);
slouken@1501
   572
					p[2] = 0x80 | (Uint8)(ch & 0x3F);
slouken@1501
   573
					dst += 3;
slouken@1501
   574
					dstlen -= 3;
slouken@1501
   575
				} else if ( ch <= 0x1FFFFF ) {
slouken@1501
   576
					if ( dstlen < 4 ) {
slouken@1501
   577
						return SDL_ICONV_E2BIG;
slouken@1501
   578
					}
slouken@1501
   579
					p[0] = 0xF0 | (Uint8)((ch >> 18) & 0x07);
slouken@1501
   580
					p[1] = 0x80 | (Uint8)((ch >> 12) & 0x3F);
slouken@1501
   581
					p[2] = 0x80 | (Uint8)((ch >> 6) & 0x3F);
slouken@1501
   582
					p[3] = 0x80 | (Uint8)(ch & 0x3F);
slouken@1501
   583
					dst += 4;
slouken@1501
   584
					dstlen -= 4;
slouken@1501
   585
				} else if ( ch <= 0x3FFFFFF ) {
slouken@1501
   586
					if ( dstlen < 5 ) {
slouken@1501
   587
						return SDL_ICONV_E2BIG;
slouken@1501
   588
					}
slouken@1501
   589
					p[0] = 0xF8 | (Uint8)((ch >> 24) & 0x03);
slouken@1501
   590
					p[1] = 0x80 | (Uint8)((ch >> 18) & 0x3F);
slouken@1501
   591
					p[2] = 0x80 | (Uint8)((ch >> 12) & 0x3F);
slouken@1501
   592
					p[3] = 0x80 | (Uint8)((ch >> 6) & 0x3F);
slouken@1501
   593
					p[4] = 0x80 | (Uint8)(ch & 0x3F);
slouken@1501
   594
					dst += 5;
slouken@1501
   595
					dstlen -= 5;
slouken@1501
   596
				} else {
slouken@1501
   597
					if ( dstlen < 6 ) {
slouken@1501
   598
						return SDL_ICONV_E2BIG;
slouken@1501
   599
					}
slouken@1501
   600
					p[0] = 0xFC | (Uint8)((ch >> 30) & 0x01);
slouken@1501
   601
					p[1] = 0x80 | (Uint8)((ch >> 24) & 0x3F);
slouken@1501
   602
					p[2] = 0x80 | (Uint8)((ch >> 18) & 0x3F);
slouken@1501
   603
					p[3] = 0x80 | (Uint8)((ch >> 12) & 0x3F);
slouken@1501
   604
					p[4] = 0x80 | (Uint8)((ch >> 6) & 0x3F);
slouken@1501
   605
					p[5] = 0x80 | (Uint8)(ch & 0x3F);
slouken@1501
   606
					dst += 6;
slouken@1501
   607
					dstlen -= 6;
slouken@1501
   608
				}
slouken@1501
   609
			}
slouken@1501
   610
			break;
slouken@1501
   611
		    case ENCODING_UTF16BE: /* RFC 2781 */
slouken@1501
   612
			{
slouken@1501
   613
				Uint8 *p = (Uint8 *)dst;
slouken@1501
   614
				if ( ch > 0x10FFFF ) {
slouken@1501
   615
					ch = UNKNOWN_UNICODE;
slouken@1501
   616
				}
slouken@1501
   617
				if ( ch < 0x10000 ) {
slouken@1501
   618
					if ( dstlen < 2 ) {
slouken@1501
   619
						return SDL_ICONV_E2BIG;
slouken@1501
   620
					}
slouken@1501
   621
					p[0] = (Uint8)(ch >> 8);
slouken@1501
   622
					p[1] = (Uint8)ch;
slouken@1501
   623
					dst += 2;
slouken@1501
   624
					dstlen -= 2;
slouken@1501
   625
				} else {
slouken@1501
   626
					Uint16 W1, W2;
slouken@1501
   627
					if ( dstlen < 4 ) {
slouken@1501
   628
						return SDL_ICONV_E2BIG;
slouken@1501
   629
					}
slouken@1501
   630
					ch = ch - 0x10000;
slouken@1501
   631
					W1 = 0xD800 | (Uint16)((ch >> 10) & 0x3FF);
slouken@1501
   632
					W2 = 0xDC00 | (Uint16)(ch & 0x3FF);
slouken@1501
   633
					p[0] = (Uint8)(W1 >> 8);
slouken@1501
   634
					p[1] = (Uint8)W1;
slouken@1501
   635
					p[2] = (Uint8)(W2 >> 8);
slouken@1501
   636
					p[3] = (Uint8)W2;
slouken@1501
   637
					dst += 4;
slouken@1501
   638
					dstlen -= 4;
slouken@1501
   639
				}
slouken@1501
   640
			}
slouken@1501
   641
			break;
slouken@1501
   642
		    case ENCODING_UTF16LE: /* RFC 2781 */
slouken@1501
   643
			{
slouken@1501
   644
				Uint8 *p = (Uint8 *)dst;
slouken@1501
   645
				if ( ch > 0x10FFFF ) {
slouken@1501
   646
					ch = UNKNOWN_UNICODE;
slouken@1501
   647
				}
slouken@1501
   648
				if ( ch < 0x10000 ) {
slouken@1501
   649
					if ( dstlen < 2 ) {
slouken@1501
   650
						return SDL_ICONV_E2BIG;
slouken@1501
   651
					}
slouken@1501
   652
					p[1] = (Uint8)(ch >> 8);
slouken@1501
   653
					p[0] = (Uint8)ch;
slouken@1501
   654
					dst += 2;
slouken@1501
   655
					dstlen -= 2;
slouken@1501
   656
				} else {
slouken@1501
   657
					Uint16 W1, W2;
slouken@1501
   658
					if ( dstlen < 4 ) {
slouken@1501
   659
						return SDL_ICONV_E2BIG;
slouken@1501
   660
					}
slouken@1501
   661
					ch = ch - 0x10000;
slouken@1501
   662
					W1 = 0xD800 | (Uint16)((ch >> 10) & 0x3FF);
slouken@1501
   663
					W2 = 0xDC00 | (Uint16)(ch & 0x3FF);
slouken@1501
   664
					p[1] = (Uint8)(W1 >> 8);
slouken@1501
   665
					p[0] = (Uint8)W1;
slouken@1501
   666
					p[3] = (Uint8)(W2 >> 8);
slouken@1501
   667
					p[2] = (Uint8)W2;
slouken@1501
   668
					dst += 4;
slouken@1501
   669
					dstlen -= 4;
slouken@1501
   670
				}
slouken@1501
   671
			}
slouken@1501
   672
			break;
slouken@1501
   673
		    case ENCODING_UTF32BE:
slouken@1501
   674
			{
slouken@1501
   675
				Uint8 *p = (Uint8 *)dst;
slouken@1502
   676
				if ( ch > 0x10FFFF ) {
slouken@1501
   677
					ch = UNKNOWN_UNICODE;
slouken@1501
   678
				}
slouken@1501
   679
				if ( dstlen < 4 ) {
slouken@1501
   680
					return SDL_ICONV_E2BIG;
slouken@1501
   681
				}
slouken@1501
   682
				p[0] = (Uint8)(ch >> 24);
slouken@1501
   683
				p[1] = (Uint8)(ch >> 16);
slouken@1501
   684
				p[2] = (Uint8)(ch >> 8);
slouken@1501
   685
				p[3] = (Uint8)ch;
slouken@1501
   686
				dst += 4;
slouken@1501
   687
				dstlen -= 4;
slouken@1501
   688
			}
slouken@1501
   689
			break;
slouken@1501
   690
		    case ENCODING_UTF32LE:
slouken@1501
   691
			{
slouken@1501
   692
				Uint8 *p = (Uint8 *)dst;
slouken@1502
   693
				if ( ch > 0x10FFFF ) {
slouken@1501
   694
					ch = UNKNOWN_UNICODE;
slouken@1501
   695
				}
slouken@1501
   696
				if ( dstlen < 4 ) {
slouken@1501
   697
					return SDL_ICONV_E2BIG;
slouken@1501
   698
				}
slouken@1501
   699
				p[3] = (Uint8)(ch >> 24);
slouken@1501
   700
				p[2] = (Uint8)(ch >> 16);
slouken@1501
   701
				p[1] = (Uint8)(ch >> 8);
slouken@1501
   702
				p[0] = (Uint8)ch;
slouken@1501
   703
				dst += 4;
slouken@1501
   704
				dstlen -= 4;
slouken@1501
   705
			}
slouken@1501
   706
			break;
slouken@1501
   707
		    case ENCODING_UCS2:
slouken@1501
   708
			{
slouken@1501
   709
				Uint16 *p = (Uint16 *)dst;
slouken@1501
   710
				if ( ch > 0xFFFF ) {
slouken@1501
   711
					ch = UNKNOWN_UNICODE;
slouken@1501
   712
				}
slouken@1501
   713
				if ( dstlen < 2 ) {
slouken@1501
   714
					return SDL_ICONV_E2BIG;
slouken@1501
   715
				}
slouken@1501
   716
				*p = (Uint16)ch;
slouken@1501
   717
				dst += 2;
slouken@1501
   718
				dstlen -= 2;
slouken@1501
   719
			}
slouken@1501
   720
			break;
slouken@1501
   721
		    case ENCODING_UCS4:
slouken@1501
   722
			{
slouken@1501
   723
				Uint32 *p = (Uint32 *)dst;
slouken@1501
   724
				if ( ch > 0x7FFFFFFF ) {
slouken@1501
   725
					ch = UNKNOWN_UNICODE;
slouken@1501
   726
				}
slouken@1501
   727
				if ( dstlen < 4 ) {
slouken@1501
   728
					return SDL_ICONV_E2BIG;
slouken@1501
   729
				}
slouken@1501
   730
				*p = ch;
slouken@1501
   731
				dst += 4;
slouken@1501
   732
				dstlen -= 4;
slouken@1501
   733
			}
slouken@1501
   734
			break;
slouken@1501
   735
		}
slouken@1501
   736
slouken@1501
   737
		/* Update state */
slouken@1501
   738
		*inbuf = src;
slouken@1501
   739
		*inbytesleft = srclen;
slouken@1501
   740
		*outbuf = dst;
slouken@1501
   741
		*outbytesleft = dstlen;
slouken@1501
   742
		++total;
slouken@1501
   743
	}
slouken@1501
   744
	return total;
slouken@1501
   745
}
slouken@1501
   746
slouken@1501
   747
int SDL_iconv_close(SDL_iconv_t cd)
slouken@1501
   748
{
slouken@1501
   749
	if ( cd && cd != (SDL_iconv_t)-1 ) {
slouken@1501
   750
		SDL_free(cd);
slouken@1501
   751
	}
slouken@1501
   752
	return 0;
slouken@1501
   753
}
slouken@1501
   754
slouken@1501
   755
#endif /* !HAVE_ICONV */
slouken@1501
   756
slouken@1501
   757
char *SDL_iconv_string(const char *tocode, const char *fromcode, char *inbuf, size_t inbytesleft)
slouken@1501
   758
{
slouken@1501
   759
	SDL_iconv_t cd;
slouken@1501
   760
	char *string;
slouken@1501
   761
	size_t stringsize;
slouken@1501
   762
	char *outbuf;
slouken@1501
   763
	size_t outbytesleft;
slouken@1501
   764
	size_t retCode = 0;
slouken@1501
   765
slouken@1501
   766
	cd = SDL_iconv_open(tocode, fromcode);
slouken@1501
   767
	if ( cd == (SDL_iconv_t)-1 ) {
slouken@1501
   768
		return NULL;
slouken@1501
   769
	}
slouken@1501
   770
slouken@1501
   771
	stringsize = inbytesleft > 4 ? inbytesleft : 4;
slouken@1501
   772
	string = SDL_malloc(stringsize);
slouken@1501
   773
	if ( !string ) {
slouken@1501
   774
		SDL_iconv_close(cd);
slouken@1501
   775
		return NULL;
slouken@1501
   776
	}
slouken@1501
   777
	outbuf = string;
slouken@1501
   778
	outbytesleft = stringsize;
slouken@1501
   779
	SDL_memset(outbuf, 0, 4);
slouken@1501
   780
slouken@1501
   781
	while ( inbytesleft > 0 ) {
slouken@1501
   782
		retCode = SDL_iconv(cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
slouken@1501
   783
		switch (retCode) {
slouken@1501
   784
		    case SDL_ICONV_E2BIG:
slouken@1501
   785
			{
slouken@1501
   786
				char *oldstring = string;
slouken@1501
   787
				stringsize *= 2;
slouken@1501
   788
				string = SDL_realloc(string, stringsize);
slouken@1501
   789
				if ( !string ) {
slouken@1501
   790
					SDL_iconv_close(cd);
slouken@1501
   791
					return NULL;
slouken@1501
   792
				}
slouken@1501
   793
				outbuf = string + (outbuf - oldstring);
slouken@1501
   794
				outbytesleft = stringsize - (outbuf - string);
slouken@1501
   795
				SDL_memset(outbuf, 0, 4);
slouken@1501
   796
			}
slouken@1501
   797
			break;
slouken@1501
   798
		    case SDL_ICONV_EILSEQ:
slouken@1501
   799
			/* Try skipping some input data - not perfect, but... */
slouken@1501
   800
			++inbuf;
slouken@1501
   801
			--inbytesleft;
slouken@1501
   802
			break;
slouken@1501
   803
		    case SDL_ICONV_EINVAL:
slouken@1501
   804
		    case SDL_ICONV_ERROR:
slouken@1501
   805
			/* We can't continue... */
slouken@1501
   806
			inbytesleft = 0;
slouken@1501
   807
			break;
slouken@1501
   808
		}
slouken@1501
   809
	}
slouken@1501
   810
	SDL_iconv_close(cd);
slouken@1501
   811
slouken@1501
   812
	return string;
slouken@1501
   813
}