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