newlib-cygwin/newlib/libc/iconv/ces/utf-16.c

301 lines
7.6 KiB
C

/*
* Copyright (c) 2003-2004, Artem B. Bityuckiy
* Copyright (c) 1999,2000, Konstantin Chuguev. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "cesbi.h"
#if defined (ICONV_TO_UCS_CES_UTF_16) \
|| defined (ICONV_FROM_UCS_CES_UTF_16)
#include <_ansi.h>
#include <reent.h>
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include "../lib/local.h"
#include "../lib/ucsconv.h"
#include "../lib/endian.h"
/*
* On input UTF-16 converter interpret BOM and uses Big Endian byte order if BOM
* is absent. UTF-16 converter outputs in System Endian and adds correspondent
* BOM as first code. UTF-16LE and UTF-16BE converters ignore BOM on input and
* don't output BOM.
*/
#define UTF16_UNDEFINED 0x00
#define UTF16_BIG_ENDIAN 0x01
#define UTF16_LITTLE_ENDIAN 0x02
#define UTF16_SYSTEM_ENDIAN 0x04
#define UTF16_BOM_WRITTEN 0x08
#define UTF16_BOM 0xFEFF
#define UTF_16 "utf_16"
#define UTF_16BE "utf_16be"
#define UTF_16LE "utf_16le"
static size_t
utf_16_close (struct _reent *rptr,
void *data)
{
_free_r(rptr, data);
return 0;
}
#if defined (ICONV_FROM_UCS_CES_UTF_16)
static void *
utf_16_init_from_ucs (struct _reent *rptr,
const char *encoding)
{
int *data;
if ((data = (int *)_malloc_r (rptr, sizeof (int))) == NULL)
return (void *)NULL;
if (strcmp (encoding, UTF_16LE) == 0)
*data = UTF16_LITTLE_ENDIAN;
else if (strcmp (encoding, UTF_16BE) == 0)
*data = UTF16_BIG_ENDIAN;
else
*data = UTF16_SYSTEM_ENDIAN;
return (void *)data;
}
static size_t
utf_16_convert_from_ucs (void *data,
register ucs4_t in,
unsigned char **outbuf,
size_t *outbytesleft)
{
register ucs2_t *cp;
register size_t bytes;
register int *state;
if (in > 0x0010FFFF || (in >= 0x0000D800 && in <= 0x0000DFFF)
|| in == 0x0000FFFF || in == 0x0000FFFE)
return (size_t)ICONV_CES_INVALID_CHARACTER;
state = (int *)data;
bytes = (*state == UTF16_SYSTEM_ENDIAN) ? sizeof (ucs2_t) * 2
: sizeof (ucs2_t);
if (in > 0x0000FFFF)
bytes += sizeof (ucs2_t);
if (*outbytesleft < bytes)
return (size_t)ICONV_CES_NOSPACE;
cp = (ucs2_t *)*outbuf;
if (*state == UTF16_SYSTEM_ENDIAN)
{
*cp++ = UTF16_BOM;
*state |= UTF16_BOM_WRITTEN;
}
if (in < 0x00010000)
{
switch (*state)
{
case UTF16_LITTLE_ENDIAN:
*cp = ICONV_HTOLES ((ucs2_t)in);
break;
case UTF16_BIG_ENDIAN:
*cp = ICONV_HTOBES ((ucs2_t)in);
break;
case (UTF16_SYSTEM_ENDIAN | UTF16_BOM_WRITTEN):
*cp = (ucs2_t)in;
break;
}
}
else
{
ucs2_t w1, w2;
/* Process surrogate pair */
in -= 0x00010000;
w1 = ((ucs2_t)((in >> 10)) & 0x03FF) | 0xD800;
w2 = (ucs2_t)(in & 0x000003FF) | 0xDC00;
switch (*state)
{
case UTF16_LITTLE_ENDIAN:
*cp++ = ICONV_HTOLES (w1);
*cp = ICONV_HTOLES (w2);
break;
case UTF16_BIG_ENDIAN:
*cp++ = ICONV_HTOBES (w1);
*cp = ICONV_HTOBES (w2);
break;
case (UTF16_SYSTEM_ENDIAN | UTF16_BOM_WRITTEN):
*cp++ = w1;
*cp = w2;
break;
}
}
*outbuf += bytes;
*outbytesleft -= bytes;
return bytes;
}
#endif /* ICONV_FROM_UCS_CES_UTF_16 */
#if defined (ICONV_TO_UCS_CES_UTF_16)
static void *
utf_16_init_to_ucs (struct _reent *rptr,
const char *encoding)
{
int *data;
if ((data = (int *)_malloc_r (rptr, sizeof (int))) == NULL)
return (void *)NULL;
if (strcmp (encoding, UTF_16BE) == 0)
*data = UTF16_BIG_ENDIAN;
else if (strcmp (encoding, UTF_16LE) == 0)
*data = UTF16_LITTLE_ENDIAN;
else
*data = UTF16_UNDEFINED;
return (void *)data;
}
static ucs4_t
utf_16_convert_to_ucs (void *data,
const unsigned char **inbuf,
size_t *inbytesleft)
{
register ucs2_t w1;
register ucs2_t w2;
register ucs2_t *cp;
int *state;
ucs4_t res;
int bytes = sizeof (ucs2_t);
if (*inbytesleft < bytes)
return (ucs4_t)ICONV_CES_BAD_SEQUENCE;
state = (int *)data;
cp = ((ucs2_t *)*inbuf);
if (*state == UTF16_UNDEFINED)
{
if (*cp == ICONV_HTOLES(UTF16_BOM))
*state = UTF16_LITTLE_ENDIAN;
else
*state = UTF16_BIG_ENDIAN;
if ( *cp == ICONV_HTOBES (UTF16_BOM)
|| *cp == ICONV_HTOLES (UTF16_BOM))
{
if (*inbytesleft < (bytes += sizeof (ucs2_t)))
return (ucs4_t)ICONV_CES_BAD_SEQUENCE;
cp += 1;
}
}
if (*state == UTF16_LITTLE_ENDIAN)
w1 = ICONV_LETOHS (*cp);
else
w1 = ICONV_BETOHS (*cp);
if (w1 < 0xD800 || w1 > 0xDFFF)
{
if (w1 == 0xFFFF || w1 == 0xFFFE)
return (ucs4_t)ICONV_CES_INVALID_CHARACTER;
res = (ucs4_t)w1;
}
else
{
/* Process surrogate pair */
if (*inbytesleft < (bytes += 2))
return (ucs4_t)ICONV_CES_BAD_SEQUENCE;
if (w1 > 0xDBFF)
/* Broken surrogate character */
return (ucs4_t)ICONV_CES_INVALID_CHARACTER;
cp += 1;
if (*state == UTF16_LITTLE_ENDIAN)
w2 = ICONV_LETOHS (*cp);
else
w2 = ICONV_BETOHS (*cp);
if (w2 < 0xDC00 || w2 > 0xDFFF)
/* Broken surrogate character */
return (ucs4_t)ICONV_CES_INVALID_CHARACTER;
res = (ucs4_t)(w2 & 0x03FF) | ((ucs4_t)(w1 & 0x03FF) << 10);
res += 0x00010000;
}
*inbuf += bytes;
*inbytesleft -= bytes;
return res;
}
#endif /* ICONV_TO_UCS_CES_UTF_16 */
static int
utf_16_get_mb_cur_max (void *data)
{
return 6;
}
#if defined (ICONV_TO_UCS_CES_UTF_16)
const iconv_to_ucs_ces_handlers_t
_iconv_to_ucs_ces_handlers_utf_16 =
{
utf_16_init_to_ucs,
utf_16_close,
utf_16_get_mb_cur_max,
NULL,
NULL,
NULL,
utf_16_convert_to_ucs
};
#endif
#if defined (ICONV_FROM_UCS_CES_UTF_16)
const iconv_from_ucs_ces_handlers_t
_iconv_from_ucs_ces_handlers_utf_16 =
{
utf_16_init_from_ucs,
utf_16_close,
utf_16_get_mb_cur_max,
NULL,
NULL,
NULL,
utf_16_convert_from_ucs
};
#endif
#endif /* ICONV_TO_UCS_CES_UTF_16 || ICONV_FROM_UCS_CES_UTF_16 */