139 lines
4.3 KiB
C
139 lines
4.3 KiB
C
/*-
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* Copyright (c) 1999,2000
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* 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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* iconv (Charset Conversion Library) v2.0
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*/
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#include "../lib/deps.h"
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#ifdef _ICONV_CONVERTER_UTF_16
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#include <string.h>
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#include "../lib/local.h"
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static ssize_t
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_DEFUN(convert_from_ucs, (ces, in, outbuf, outbytesleft),
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struct iconv_ces *ces _AND
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ucs_t in _AND
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unsigned char **outbuf _AND
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size_t *outbytesleft)
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{
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unsigned char *cp;
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int *state;
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int bytes;
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if (in == UCS_CHAR_NONE)
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return 1; /* No state reinitialization for table charsets */
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if (in > 0x10FFFF)
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return -1;
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bytes = *(state = (int *)(ces->data)) ? 2 : 4;
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if (in > 0xFFFF)
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bytes += 2;
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if (*outbytesleft < bytes)
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return 0; /* No space in the output buffer */
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cp = *outbuf;
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if (*state == 0) {
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*cp++ = 0xFE;
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*cp++ = 0xFF;
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*state = 1;
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}
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if (in > 0xFFFF) {
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*cp++ = ((in -= 0x10000) >> 18) | 0xD8;
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*cp++ = (in >> 10) & 0xFF;
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*cp++ = ((in >> 8) & 3) | 0xDC;
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} else
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*cp++ = (in >> 8) & 0xFF;
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*cp++ = in & 0xFF;
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(*outbuf) += bytes;
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*outbytesleft -= bytes;
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return 1;
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}
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static __inline ucs_t
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_DEFUN(msb, (buf), _CONST unsigned char *buf)
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{
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return (buf[0] << 8) | buf[1];
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}
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static ucs_t
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_DEFUN(convert_to_ucs, (ces, inbuf, inbytesleft),
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struct iconv_ces *ces _AND
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_CONST unsigned char **inbuf _AND
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size_t *inbytesleft)
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{
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ucs_t res, res2;
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int *state, mark;
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if (*inbytesleft < 2)
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return UCS_CHAR_NONE; /* Not enough bytes in the input buffer */
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state = (int *)(ces->data);
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res = msb(*inbuf);
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switch (res) {
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case UCS_CHAR_ZERO_WIDTH_NBSP:
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if (*state == 0)
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*state = 1;
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mark = 1;
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break;
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case UCS_CHAR_INVALID:
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if (*state == 0)
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*state = 2;
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mark = 1;
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break;
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default:
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if (*state == 0)
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*state = 1;
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mark = 0;
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}
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if (mark) {
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if (*inbytesleft < 4)
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return UCS_CHAR_NONE; /* Not enough bytes in the input buffer */
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*inbytesleft -= 2;
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res = msb((*inbuf) += 2);
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}
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if (*state == 2) { /* LSB order */
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res = (*(*inbuf) ++);
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res |= (*(*inbuf) ++) << 8;
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} else
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*inbuf += 2;
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*inbytesleft -= 2;
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if ((res & 0xFC00) != 0xD800) /* Non-surrogate character */
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return res;
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if (*inbytesleft < 2)
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return UCS_CHAR_NONE; /* Not enough bytes in the input buffer */
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if (*state == 2) {
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res2 = (*inbuf)[0];
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res2 |= (*inbuf)[1] << 8;
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} else
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res2 = msb(*inbuf);
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if ((res2 & 0xFC00) != 0xDC00) /* Broken surrogate pair */
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return -1;
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(*inbuf) += 2;
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(*inbytesleft) -= 2;
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return (((res & 0x3FF) << 10) | (res2 & 0x3FF)) + 0x10000;
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}
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ICONV_CES_STATEFUL_MODULE_DECL(utf_16);
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#endif /* #ifdef _ICONV_CONVERTER_UTF_16 */
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