SDL_iconv.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2009 Sam Lantinga
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This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
/* This file contains portable iconv functions for SDL */
#include "SDL_stdinc.h"
#include "SDL_endian.h"
#ifdef HAVE_ICONV
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/* Depending on which standard the iconv() was implemented with,
iconv() may or may not use const char ** for the inbuf param.
If we get this wrong, it's just a warning, so no big deal.
*/
#if defined(_XGP6) || \
defined(__GLIBC__) && ((__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 2))
#define ICONV_INBUF_NONCONST
#endif
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#include <errno.h>
size_t SDL_iconv(SDL_iconv_t cd,
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const char **inbuf, size_t *inbytesleft,
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char **outbuf, size_t *outbytesleft)
{
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size_t retCode;
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#ifdef ICONV_INBUF_NONCONST
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retCode = iconv(cd, (char **)inbuf, inbytesleft, outbuf, outbytesleft);
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#else
retCode = iconv(cd, inbuf, inbytesleft, outbuf, outbytesleft);
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if ( retCode == (size_t)-1 ) {
switch(errno) {
case E2BIG:
return SDL_ICONV_E2BIG;
case EILSEQ:
return SDL_ICONV_EILSEQ;
case EINVAL:
return SDL_ICONV_EINVAL;
default:
return SDL_ICONV_ERROR;
}
}
return retCode;
}
#else
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/* Lots of useful information on Unicode at:
http://www.cl.cam.ac.uk/~mgk25/unicode.html
*/
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#define UNICODE_BOM 0xFEFF
#define UNKNOWN_ASCII '?'
#define UNKNOWN_UNICODE 0xFFFD
enum {
ENCODING_UNKNOWN,
ENCODING_ASCII,
ENCODING_LATIN1,
ENCODING_UTF8,
ENCODING_UTF16, /* Needs byte order marker */
ENCODING_UTF16BE,
ENCODING_UTF16LE,
ENCODING_UTF32, /* Needs byte order marker */
ENCODING_UTF32BE,
ENCODING_UTF32LE,
ENCODING_UCS2, /* Native byte order assumed */
ENCODING_UCS4, /* Native byte order assumed */
};
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
#define ENCODING_UTF16NATIVE ENCODING_UTF16BE
#define ENCODING_UTF32NATIVE ENCODING_UTF32BE
#else
#define ENCODING_UTF16NATIVE ENCODING_UTF16LE
#define ENCODING_UTF32NATIVE ENCODING_UTF32LE
#endif
struct _SDL_iconv_t
{
int src_fmt;
int dst_fmt;
};
static struct {
const char *name;
int format;
} encodings[] = {
{ "ASCII", ENCODING_ASCII },
{ "US-ASCII", ENCODING_ASCII },
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{ "ISO-8859-1", ENCODING_LATIN1 },
{ "UTF8", ENCODING_UTF8 },
{ "UTF-8", ENCODING_UTF8 },
{ "UTF16", ENCODING_UTF16 },
{ "UTF-16", ENCODING_UTF16 },
{ "UTF16BE", ENCODING_UTF16BE },
{ "UTF-16BE", ENCODING_UTF16BE },
{ "UTF16LE", ENCODING_UTF16LE },
{ "UTF-16LE", ENCODING_UTF16LE },
{ "UTF32", ENCODING_UTF32 },
{ "UTF-32", ENCODING_UTF32 },
{ "UTF32BE", ENCODING_UTF32BE },
{ "UTF-32BE", ENCODING_UTF32BE },
{ "UTF32LE", ENCODING_UTF32LE },
{ "UTF-32LE", ENCODING_UTF32LE },
{ "UCS2", ENCODING_UCS2 },
{ "UCS-2", ENCODING_UCS2 },
{ "UCS4", ENCODING_UCS4 },
{ "UCS-4", ENCODING_UCS4 },
};
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static const char *getlocale(char *buffer, size_t bufsize)
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lang = SDL_getenv("LC_ALL");
if ( !lang ) {
lang = SDL_getenv("LC_CTYPE");
}
if ( !lang ) {
lang = SDL_getenv("LC_MESSAGES");
}
if ( !lang ) {
lang = SDL_getenv("LANG");
}
if ( !lang || !*lang || SDL_strcmp(lang, "C") == 0 ) {
lang = "ASCII";
}
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/* We need to trim down strings like "en_US.UTF-8@blah" to "UTF-8" */
ptr = SDL_strchr(lang, '.');
if (ptr != NULL) {
lang = ptr + 1;
}
SDL_strlcpy(buffer, lang, bufsize);
ptr = SDL_strchr(buffer, '@');
if (ptr != NULL) {
*ptr = '\0'; /* chop end of string. */
}
return buffer;
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SDL_iconv_t SDL_iconv_open(const char *tocode, const char *fromcode)
{
int src_fmt = ENCODING_UNKNOWN;
int dst_fmt = ENCODING_UNKNOWN;
int i;
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char fromcode_buffer[64];
char tocode_buffer[64];
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fromcode = getlocale(fromcode_buffer, sizeof(fromcode_buffer));
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tocode = getlocale(tocode_buffer, sizeof(tocode_buffer));
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for ( i = 0; i < SDL_arraysize(encodings); ++i ) {
if ( SDL_strcasecmp(fromcode, encodings[i].name) == 0 ) {
src_fmt = encodings[i].format;
if ( dst_fmt != ENCODING_UNKNOWN ) {
break;
}
}
if ( SDL_strcasecmp(tocode, encodings[i].name) == 0 ) {
dst_fmt = encodings[i].format;
if ( src_fmt != ENCODING_UNKNOWN ) {
break;
}
}
}
if ( src_fmt != ENCODING_UNKNOWN && dst_fmt != ENCODING_UNKNOWN ) {
SDL_iconv_t cd = (SDL_iconv_t)SDL_malloc(sizeof(*cd));
if ( cd ) {
cd->src_fmt = src_fmt;
cd->dst_fmt = dst_fmt;
return cd;
}
}
return (SDL_iconv_t)-1;
}
size_t SDL_iconv(SDL_iconv_t cd,
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const char **inbuf, size_t *inbytesleft,
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char **outbuf, size_t *outbytesleft)
{
/* For simplicity, we'll convert everything to and from UCS-4 */
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const char *src;
char *dst;
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size_t srclen, dstlen;
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Uint32 ch = 0;
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size_t total;
if ( !inbuf || !*inbuf ) {
/* Reset the context */
return 0;
}
if ( !outbuf || !*outbuf || !outbytesleft || !*outbytesleft ) {
return SDL_ICONV_E2BIG;
}
src = *inbuf;
srclen = (inbytesleft ? *inbytesleft : 0);
dst = *outbuf;
dstlen = *outbytesleft;
switch ( cd->src_fmt ) {
case ENCODING_UTF16:
/* Scan for a byte order marker */
{
Uint8 *p = (Uint8 *)src;
size_t n = srclen / 2;
while ( n ) {
if ( p[0] == 0xFF && p[1] == 0xFE ) {
cd->src_fmt = ENCODING_UTF16BE;
break;
} else if ( p[0] == 0xFE && p[1] == 0xFF ) {
cd->src_fmt = ENCODING_UTF16LE;
break;
}
p += 2;
--n;
}
if ( n == 0 ) {
/* We can't tell, default to host order */
cd->src_fmt = ENCODING_UTF16NATIVE;
}
}
break;
case ENCODING_UTF32:
/* Scan for a byte order marker */
{
Uint8 *p = (Uint8 *)src;
size_t n = srclen / 4;
while ( n ) {
if ( p[0] == 0xFF && p[1] == 0xFE &&
p[2] == 0x00 && p[3] == 0x00 ) {
cd->src_fmt = ENCODING_UTF32BE;
break;
} else if ( p[0] == 0x00 && p[1] == 0x00 &&
p[2] == 0xFE && p[3] == 0xFF ) {
cd->src_fmt = ENCODING_UTF32LE;
break;
}
p += 4;
--n;
}
if ( n == 0 ) {
/* We can't tell, default to host order */
cd->src_fmt = ENCODING_UTF32NATIVE;
}
}
break;
}
switch ( cd->dst_fmt ) {
case ENCODING_UTF16:
/* Default to host order, need to add byte order marker */
if ( dstlen < 2 ) {
return SDL_ICONV_E2BIG;
}
*(Uint16 *)dst = UNICODE_BOM;
dst += 2;
dstlen -= 2;
cd->dst_fmt = ENCODING_UTF16NATIVE;
break;
case ENCODING_UTF32:
/* Default to host order, need to add byte order marker */
if ( dstlen < 4 ) {
return SDL_ICONV_E2BIG;
}
*(Uint32 *)dst = UNICODE_BOM;
dst += 4;
dstlen -= 4;
cd->dst_fmt = ENCODING_UTF32NATIVE;
break;
}
total = 0;
while ( srclen > 0 ) {
/* Decode a character */
switch ( cd->src_fmt ) {
case ENCODING_ASCII:
{
Uint8 *p = (Uint8 *)src;
ch = (Uint32)(p[0] & 0x7F);
++src;
--srclen;
}
break;
case ENCODING_LATIN1:
{
Uint8 *p = (Uint8 *)src;
ch = (Uint32)p[0];
++src;
--srclen;
}
break;
case ENCODING_UTF8: /* RFC 3629 */
{
Uint8 *p = (Uint8 *)src;
size_t left = 0;
SDL_bool overlong = SDL_FALSE;
if ( p[0] >= 0xFC ) {
if ( (p[0] & 0xFE) != 0xFC ) {
/* Skip illegal sequences
return SDL_ICONV_EILSEQ;
*/
ch = UNKNOWN_UNICODE;
} else {
if ( p[0] == 0xFC ) {
overlong = SDL_TRUE;
}
ch = (Uint32)(p[0] & 0x01);
left = 5;
}
} else if ( p[0] >= 0xF8 ) {
if ( (p[0] & 0xFC) != 0xF8 ) {
/* Skip illegal sequences
return SDL_ICONV_EILSEQ;
*/
ch = UNKNOWN_UNICODE;
} else {
if ( p[0] == 0xF8 ) {
overlong = SDL_TRUE;
}
ch = (Uint32)(p[0] & 0x03);
left = 4;
}
} else if ( p[0] >= 0xF0 ) {
if ( (p[0] & 0xF8) != 0xF0 ) {
/* Skip illegal sequences
return SDL_ICONV_EILSEQ;
*/
ch = UNKNOWN_UNICODE;
} else {
if ( p[0] == 0xF0 ) {
overlong = SDL_TRUE;
}
ch = (Uint32)(p[0] & 0x07);
left = 3;
}
} else if ( p[0] >= 0xE0 ) {
if ( (p[0] & 0xF0) != 0xE0 ) {
/* Skip illegal sequences
return SDL_ICONV_EILSEQ;
*/
ch = UNKNOWN_UNICODE;
} else {
if ( p[0] == 0xE0 ) {
overlong = SDL_TRUE;
}
ch = (Uint32)(p[0] & 0x0F);
left = 2;
}
} else if ( p[0] >= 0xC0 ) {
if ( (p[0] & 0xE0) != 0xC0 ) {
/* Skip illegal sequences
return SDL_ICONV_EILSEQ;
*/
ch = UNKNOWN_UNICODE;
} else {
if ( (p[0] & 0xCE) == 0xC0 ) {
overlong = SDL_TRUE;
}
ch = (Uint32)(p[0] & 0x1F);
left = 1;
}
} else {
if ( (p[0] & 0x80) != 0x00 ) {
/* Skip illegal sequences
return SDL_ICONV_EILSEQ;
*/
ch = UNKNOWN_UNICODE;
} else {
ch = (Uint32)p[0];
}
}
++src;
--srclen;
if ( srclen < left ) {
return SDL_ICONV_EINVAL;
}
while ( left-- ) {
++p;
if ( (p[0] & 0xC0) != 0x80 ) {
/* Skip illegal sequences
return SDL_ICONV_EILSEQ;
*/
ch = UNKNOWN_UNICODE;
break;
}
ch <<= 6;
ch |= (p[0] & 0x3F);
++src;
--srclen;
}
if ( overlong ) {
/* Potential security risk
return SDL_ICONV_EILSEQ;
*/
ch = UNKNOWN_UNICODE;
}
if ( (ch >= 0xD800 && ch <= 0xDFFF) ||
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(ch == 0xFFFE || ch == 0xFFFF) ||
ch > 0x10FFFF ) {
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/* Skip illegal sequences
return SDL_ICONV_EILSEQ;
*/
ch = UNKNOWN_UNICODE;
}
}
break;
case ENCODING_UTF16BE: /* RFC 2781 */
{
Uint8 *p = (Uint8 *)src;
Uint16 W1, W2;
if ( srclen < 2 ) {
return SDL_ICONV_EINVAL;
}
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W1 = ((Uint16)p[0] << 8) |
(Uint16)p[1];
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src += 2;
srclen -= 2;
if ( W1 < 0xD800 || W1 > 0xDFFF ) {
ch = (Uint32)W1;
break;
}
if ( W1 > 0xDBFF ) {
/* Skip illegal sequences
return SDL_ICONV_EILSEQ;
*/
ch = UNKNOWN_UNICODE;
break;
}
if ( srclen < 2 ) {
return SDL_ICONV_EINVAL;
}
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p = (Uint8 *)src;
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W2 = ((Uint16)p[0] << 8) |
(Uint16)p[1];
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src += 2;
srclen -= 2;
if ( W2 < 0xDC00 || W2 > 0xDFFF ) {
/* Skip illegal sequences
return SDL_ICONV_EILSEQ;
*/
ch = UNKNOWN_UNICODE;
break;
}
ch = (((Uint32)(W1 & 0x3FF) << 10) |
(Uint32)(W2 & 0x3FF)) + 0x10000;
}
break;
case ENCODING_UTF16LE: /* RFC 2781 */
{
Uint8 *p = (Uint8 *)src;
Uint16 W1, W2;
if ( srclen < 2 ) {
return SDL_ICONV_EINVAL;
}
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W1 = ((Uint16)p[1] << 8) |
(Uint16)p[0];
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src += 2;
srclen -= 2;
if ( W1 < 0xD800 || W1 > 0xDFFF ) {
ch = (Uint32)W1;
break;
}
if ( W1 > 0xDBFF ) {
/* Skip illegal sequences
return SDL_ICONV_EILSEQ;
*/
ch = UNKNOWN_UNICODE;
break;
}
if ( srclen < 2 ) {
return SDL_ICONV_EINVAL;
}
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p = (Uint8 *)src;
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W2 = ((Uint16)p[1] << 8) |
(Uint16)p[0];
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src += 2;
srclen -= 2;
if ( W2 < 0xDC00 || W2 > 0xDFFF ) {
/* Skip illegal sequences
return SDL_ICONV_EILSEQ;
*/
ch = UNKNOWN_UNICODE;
break;
}
ch = (((Uint32)(W1 & 0x3FF) << 10) |
(Uint32)(W2 & 0x3FF)) + 0x10000;
}
break;
case ENCODING_UTF32BE:
{
Uint8 *p = (Uint8 *)src;
if ( srclen < 4 ) {
return SDL_ICONV_EINVAL;
}
ch = ((Uint32)p[0] << 24) |
((Uint32)p[1] << 16) |
((Uint32)p[2] << 8) |
(Uint32)p[3];
src += 4;
srclen -= 4;
}
break;
case ENCODING_UTF32LE:
{
Uint8 *p = (Uint8 *)src;
if ( srclen < 4 ) {
return SDL_ICONV_EINVAL;
}
ch = ((Uint32)p[3] << 24) |
((Uint32)p[2] << 16) |
((Uint32)p[1] << 8) |
(Uint32)p[0];
src += 4;
srclen -= 4;
}
break;
case ENCODING_UCS2:
{
Uint16 *p = (Uint16 *)src;
if ( srclen < 2 ) {
return SDL_ICONV_EINVAL;
}
ch = *p;
src += 2;
srclen -= 2;
}
break;
case ENCODING_UCS4:
{
Uint32 *p = (Uint32 *)src;
if ( srclen < 4 ) {
return SDL_ICONV_EINVAL;
}
ch = *p;
src += 4;
srclen -= 4;
}
break;
}
/* Encode a character */
switch ( cd->dst_fmt ) {
case ENCODING_ASCII:
{
Uint8 *p = (Uint8 *)dst;
if ( dstlen < 1 ) {
return SDL_ICONV_E2BIG;
}
if ( ch > 0x7F ) {
*p = UNKNOWN_ASCII;
} else {
*p = (Uint8)ch;
}
++dst;
--dstlen;
}
break;
case ENCODING_LATIN1:
{
Uint8 *p = (Uint8 *)dst;
if ( dstlen < 1 ) {
return SDL_ICONV_E2BIG;
}
if ( ch > 0xFF ) {
*p = UNKNOWN_ASCII;
} else {
*p = (Uint8)ch;
}
++dst;
--dstlen;
}
break;
case ENCODING_UTF8: /* RFC 3629 */
{
Uint8 *p = (Uint8 *)dst;
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if ( ch > 0x10FFFF ) {
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ch = UNKNOWN_UNICODE;
}
if ( ch <= 0x7F ) {
if ( dstlen < 1 ) {
return SDL_ICONV_E2BIG;
}
*p = (Uint8)ch;
++dst;
--dstlen;
} else if ( ch <= 0x7FF ) {
if ( dstlen < 2 ) {
return SDL_ICONV_E2BIG;
}
p[0] = 0xC0 | (Uint8)((ch >> 6) & 0x1F);
p[1] = 0x80 | (Uint8)(ch & 0x3F);
dst += 2;
dstlen -= 2;
} else if ( ch <= 0xFFFF ) {
if ( dstlen < 3 ) {
return SDL_ICONV_E2BIG;
}
p[0] = 0xE0 | (Uint8)((ch >> 12) & 0x0F);
p[1] = 0x80 | (Uint8)((ch >> 6) & 0x3F);
p[2] = 0x80 | (Uint8)(ch & 0x3F);
dst += 3;
dstlen -= 3;
} else if ( ch <= 0x1FFFFF ) {
if ( dstlen < 4 ) {
return SDL_ICONV_E2BIG;
}
p[0] = 0xF0 | (Uint8)((ch >> 18) & 0x07);
p[1] = 0x80 | (Uint8)((ch >> 12) & 0x3F);
p[2] = 0x80 | (Uint8)((ch >> 6) & 0x3F);
p[3] = 0x80 | (Uint8)(ch & 0x3F);
dst += 4;
dstlen -= 4;
} else if ( ch <= 0x3FFFFFF ) {
if ( dstlen < 5 ) {
return SDL_ICONV_E2BIG;
}
p[0] = 0xF8 | (Uint8)((ch >> 24) & 0x03);
p[1] = 0x80 | (Uint8)((ch >> 18) & 0x3F);
p[2] = 0x80 | (Uint8)((ch >> 12) & 0x3F);
p[3] = 0x80 | (Uint8)((ch >> 6) & 0x3F);
p[4] = 0x80 | (Uint8)(ch & 0x3F);
dst += 5;
dstlen -= 5;
} else {
if ( dstlen < 6 ) {
return SDL_ICONV_E2BIG;
}
p[0] = 0xFC | (Uint8)((ch >> 30) & 0x01);
p[1] = 0x80 | (Uint8)((ch >> 24) & 0x3F);
p[2] = 0x80 | (Uint8)((ch >> 18) & 0x3F);
p[3] = 0x80 | (Uint8)((ch >> 12) & 0x3F);
p[4] = 0x80 | (Uint8)((ch >> 6) & 0x3F);
p[5] = 0x80 | (Uint8)(ch & 0x3F);
dst += 6;
dstlen -= 6;
}
}
break;
case ENCODING_UTF16BE: /* RFC 2781 */
{
Uint8 *p = (Uint8 *)dst;
if ( ch > 0x10FFFF ) {
ch = UNKNOWN_UNICODE;
}
if ( ch < 0x10000 ) {
if ( dstlen < 2 ) {
return SDL_ICONV_E2BIG;
}
p[0] = (Uint8)(ch >> 8);
p[1] = (Uint8)ch;
dst += 2;
dstlen -= 2;
} else {
Uint16 W1, W2;
if ( dstlen < 4 ) {
return SDL_ICONV_E2BIG;
}
ch = ch - 0x10000;
W1 = 0xD800 | (Uint16)((ch >> 10) & 0x3FF);
W2 = 0xDC00 | (Uint16)(ch & 0x3FF);
p[0] = (Uint8)(W1 >> 8);
p[1] = (Uint8)W1;
p[2] = (Uint8)(W2 >> 8);
p[3] = (Uint8)W2;
dst += 4;
dstlen -= 4;
}
}
break;
case ENCODING_UTF16LE: /* RFC 2781 */
{
Uint8 *p = (Uint8 *)dst;
if ( ch > 0x10FFFF ) {
ch = UNKNOWN_UNICODE;
}
if ( ch < 0x10000 ) {
if ( dstlen < 2 ) {
return SDL_ICONV_E2BIG;
}
p[1] = (Uint8)(ch >> 8);
p[0] = (Uint8)ch;
dst += 2;
dstlen -= 2;
} else {
Uint16 W1, W2;
if ( dstlen < 4 ) {
return SDL_ICONV_E2BIG;
}
ch = ch - 0x10000;
W1 = 0xD800 | (Uint16)((ch >> 10) & 0x3FF);
W2 = 0xDC00 | (Uint16)(ch & 0x3FF);
p[1] = (Uint8)(W1 >> 8);
p[0] = (Uint8)W1;
p[3] = (Uint8)(W2 >> 8);
p[2] = (Uint8)W2;
dst += 4;
dstlen -= 4;
}
}
break;
case ENCODING_UTF32BE:
{
Uint8 *p = (Uint8 *)dst;
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if ( ch > 0x10FFFF ) {
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ch = UNKNOWN_UNICODE;
}
if ( dstlen < 4 ) {
return SDL_ICONV_E2BIG;
}
p[0] = (Uint8)(ch >> 24);
p[1] = (Uint8)(ch >> 16);
p[2] = (Uint8)(ch >> 8);
p[3] = (Uint8)ch;
dst += 4;
dstlen -= 4;
}
break;
case ENCODING_UTF32LE:
{
Uint8 *p = (Uint8 *)dst;
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if ( ch > 0x10FFFF ) {
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ch = UNKNOWN_UNICODE;
}
if ( dstlen < 4 ) {
return SDL_ICONV_E2BIG;
}
p[3] = (Uint8)(ch >> 24);
p[2] = (Uint8)(ch >> 16);
p[1] = (Uint8)(ch >> 8);
p[0] = (Uint8)ch;
dst += 4;
dstlen -= 4;
}
break;
case ENCODING_UCS2:
{
Uint16 *p = (Uint16 *)dst;
if ( ch > 0xFFFF ) {
ch = UNKNOWN_UNICODE;
}
if ( dstlen < 2 ) {
return SDL_ICONV_E2BIG;
}
*p = (Uint16)ch;
dst += 2;
dstlen -= 2;
}
break;
case ENCODING_UCS4:
{
Uint32 *p = (Uint32 *)dst;
if ( ch > 0x7FFFFFFF ) {
ch = UNKNOWN_UNICODE;
}
if ( dstlen < 4 ) {
return SDL_ICONV_E2BIG;
}
*p = ch;
dst += 4;
dstlen -= 4;
}
break;
}
/* Update state */
*inbuf = src;
*inbytesleft = srclen;
*outbuf = dst;
*outbytesleft = dstlen;
++total;
}
return total;
}
int SDL_iconv_close(SDL_iconv_t cd)
{
if ( cd && cd != (SDL_iconv_t)-1 ) {
SDL_free(cd);
}
return 0;
}
#endif /* !HAVE_ICONV */
815
char *SDL_iconv_string(const char *tocode, const char *fromcode, const char *inbuf, size_t inbytesleft)
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{
SDL_iconv_t cd;
char *string;
size_t stringsize;
char *outbuf;
size_t outbytesleft;
size_t retCode = 0;
cd = SDL_iconv_open(tocode, fromcode);
if ( cd == (SDL_iconv_t)-1 ) {
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/* See if we can recover here (fixes iconv on Solaris 11) */
if ( !tocode || !*tocode ) {
tocode = "UTF-8";
}
if ( !fromcode || !*fromcode ) {
tocode = "UTF-8";
}
cd = SDL_iconv_open(tocode, fromcode);
}
if ( cd == (SDL_iconv_t)-1 ) {
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return NULL;
}
stringsize = inbytesleft > 4 ? inbytesleft : 4;
string = SDL_malloc(stringsize);
if ( !string ) {
SDL_iconv_close(cd);
return NULL;
}
outbuf = string;
outbytesleft = stringsize;
SDL_memset(outbuf, 0, 4);
while ( inbytesleft > 0 ) {
retCode = SDL_iconv(cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
switch (retCode) {
case SDL_ICONV_E2BIG:
{
char *oldstring = string;
stringsize *= 2;
string = SDL_realloc(string, stringsize);
if ( !string ) {
SDL_iconv_close(cd);
return NULL;
}
outbuf = string + (outbuf - oldstring);
outbytesleft = stringsize - (outbuf - string);
SDL_memset(outbuf, 0, 4);
}
break;
case SDL_ICONV_EILSEQ:
/* Try skipping some input data - not perfect, but... */
++inbuf;
--inbytesleft;
break;
case SDL_ICONV_EINVAL:
case SDL_ICONV_ERROR:
/* We can't continue... */
inbytesleft = 0;
break;
}
}
SDL_iconv_close(cd);
return string;
}