188 lines
6.6 KiB
C
188 lines
6.6 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_8
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#include "../lib/local.h"
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#define cont_byte(b) (((b) & 0x3F) | 0x80)
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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 n;
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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 < 0x80) {
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n = 1;
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} else if (in < 0x800) {
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n = 2;
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} else if (in < 0x10000) {
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n = 3;
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} else if (in < 0x200000) {
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n = 4;
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} else if (in < 0x4000000) {
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n = 5;
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} else if (in <= 0x7FFFFFFF) {
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n = 6;
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} else
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return -1;
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if (*outbytesleft < n)
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return 0;
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cp = *outbuf;
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switch (n) {
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case 1:
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*cp = (unsigned char)in;
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break;
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case 2:
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*cp++ = (unsigned char)((in >> 6) | 0xC0);
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*cp++ = (unsigned char)cont_byte(in);
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break;
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case 3:
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*cp++ = (unsigned char)((in >> 12) | 0xE0);
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*cp++ = (unsigned char)cont_byte(in >> 6);
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*cp++ = (unsigned char)cont_byte(in);
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break;
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case 4:
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*cp++ = (unsigned char)((in >> 18) | 0xF0);
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*cp++ = (unsigned char)cont_byte(in >> 12);
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*cp++ = (unsigned char)cont_byte(in >> 6);
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*cp++ = (unsigned char)cont_byte(in);
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break;
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case 5:
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*cp++ = (unsigned char)((in >> 24) | 0xF8);
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*cp++ = (unsigned char)cont_byte(in >> 18);
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*cp++ = (unsigned char)cont_byte(in >> 12);
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*cp++ = (unsigned char)cont_byte(in >> 6);
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*cp++ = (unsigned char)cont_byte(in);
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break;
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case 6:
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*cp++ = (unsigned char)((in >> 30) | 0xFC);
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*cp++ = (unsigned char)cont_byte(in >> 24);
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*cp++ = (unsigned char)cont_byte(in >> 18);
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*cp++ = (unsigned char)cont_byte(in >> 12);
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*cp++ = (unsigned char)cont_byte(in >> 6);
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*cp++ = (unsigned char)cont_byte(in);
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break;
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}
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(*outbytesleft) -= n;
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(*outbuf) += n;
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return 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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_CONST unsigned char *in = *inbuf;
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unsigned char byte = *in++;
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ucs_t res = byte;
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if (byte >= 0xC0) {
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if (byte < 0xE0) {
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if (*inbytesleft < 2)
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return UCS_CHAR_NONE;
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if (((byte & ~0x1F) == 0xC0)
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&& ((in[0] & 0xC0) == 0x80)) {
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res = ((byte & 0x1F) << 6) | (*in++ & 0x3F);
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} else
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res = UCS_CHAR_INVALID;
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} else if (byte < 0xF0) {
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if (*inbytesleft < 3)
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return UCS_CHAR_NONE;
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if (((byte & ~0x0F) == 0xE0)
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&& ((in[0] & 0xC0) == 0x80)
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&& ((in[1] & 0xC0) == 0x80)) {
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res = ((byte & 0x0F) << 12) | ((in[0] & 0x3F) << 6)
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| (in[1] & 0x3F);
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in += 2;
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} else
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res = UCS_CHAR_INVALID;
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} else if (byte < 0xF8) {
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if (*inbytesleft < 4)
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return UCS_CHAR_NONE;
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if (((byte & ~0x7) == 0xF0)
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&& ((in[0] & 0xC0) == 0x80)
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&& ((in[1] & 0xC0) == 0x80)
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&& ((in[2] & 0xC0) == 0x80)) {
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res = ((byte & 0x7) << 18) | ((in[0] & 0x3F) << 12)
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| ((in[1] & 0x3F) << 6) | (in[2] & 0x3F);
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in += 3;
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} else
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res = UCS_CHAR_INVALID;
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} else if (byte < 0xFC) {
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if (*inbytesleft < 5)
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return UCS_CHAR_NONE;
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if (((byte & ~0x3) == 0xF8)
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&& ((in[0] & 0xC0) == 0x80)
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&& ((in[1] & 0xC0) == 0x80)
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&& ((in[2] & 0xC0) == 0x80)
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&& ((in[3] & 0xC0) == 0x80)) {
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res = ((byte & 0x3) << 24) | ((in[0] & 0x3F) << 18)
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| ((in[1] & 0x3F) << 12) | ((in[2] & 0x3F) << 8)
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| (in[3] & 0x3F);
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in += 4;
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} else
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res = UCS_CHAR_INVALID;
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} else if (byte <= 0xFD) {
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if (*inbytesleft < 6)
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return UCS_CHAR_NONE;
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if (((byte & ~0x1) == 0xFC)
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&& ((in[0] & 0xC0) == 0x80)
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&& ((in[1] & 0xC0) == 0x80)
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&& ((in[2] & 0xC0) == 0x80)
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&& ((in[3] & 0xC0) == 0x80)
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&& ((in[4] & 0xC0) == 0x80)) {
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res = ((byte & 0x1) << 30) | ((in[0] & 0x3F) << 24)
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| ((in[1] & 0x3F) << 18) | ((in[2] & 0x3F) << 12)
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| ((in[3] & 0x3F) << 8) | (in[4] & 0x3F);
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in += 5;
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} else
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res = UCS_CHAR_INVALID;
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} else
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res = UCS_CHAR_INVALID;
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} else if (byte & 0x80)
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res = UCS_CHAR_INVALID;
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(*inbytesleft) -= (in - *inbuf);
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*inbuf = in;
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return res;
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}
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ICONV_CES_STATELESS_MODULE_DECL(utf_8);
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#endif /* #ifdef _ICONV_CONVERTER_UTF_8 */
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