164 lines
3.6 KiB
C
164 lines
3.6 KiB
C
/*
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* Copyright (C) 1999-2001, 2008, 2016 Free Software Foundation, Inc.
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* This file is part of the GNU LIBICONV Library.
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*
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* The GNU LIBICONV Library is free software; you can redistribute it
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* and/or modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either version 2.1
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* of the License, or (at your option) any later version.
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*
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* The GNU LIBICONV Library is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with the GNU LIBICONV Library; see the file COPYING.LIB.
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* If not, see <https://www.gnu.org/licenses/>.
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*/
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/*
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* HZ
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*/
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/* Specification: RFC 1842, RFC 1843 */
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/*
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* The state is 1 in GB mode, 0 in ASCII mode.
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*/
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static int
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hz_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
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{
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state_t state = conv->istate;
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unsigned int count = 0;
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unsigned char c;
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for (;;) {
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c = *s;
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if (c == '~') {
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if (n < count+2)
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goto none;
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c = s[1];
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if (state == 0) {
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if (c == '~') {
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*pwc = (ucs4_t) '~';
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conv->istate = state;
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return count+2;
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}
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if (c == '{') {
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state = 1;
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s += 2; count += 2;
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if (n < count+1)
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goto none;
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continue;
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}
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if (c == '\n') {
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s += 2; count += 2;
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if (n < count+1)
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goto none;
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continue;
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}
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} else {
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if (c == '}') {
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state = 0;
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s += 2; count += 2;
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if (n < count+1)
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goto none;
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continue;
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}
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}
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goto ilseq;
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}
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break;
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}
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if (state == 0) {
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*pwc = (ucs4_t) c;
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conv->istate = state;
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return count+1;
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} else {
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int ret;
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if (n < count+2)
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goto none;
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ret = gb2312_mbtowc(conv,pwc,s,2);
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if (ret == RET_ILSEQ)
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goto ilseq;
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if (ret != 2) abort();
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conv->istate = state;
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return count+2;
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}
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none:
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conv->istate = state;
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return RET_TOOFEW(count);
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ilseq:
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conv->istate = state;
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return RET_SHIFT_ILSEQ(count);
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}
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static int
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hz_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
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{
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state_t state = conv->ostate;
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unsigned char buf[2];
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int ret;
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/* Code set 0 (ASCII or GB 1988-89) */
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ret = ascii_wctomb(conv,buf,wc,1);
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if (ret != RET_ILUNI) {
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if (ret != 1) abort();
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if (buf[0] < 0x80) {
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int count = (state ? 3 : 1);
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if (n < count)
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return RET_TOOSMALL;
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if (state) {
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r[0] = '~';
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r[1] = '}';
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r += 2;
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state = 0;
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}
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r[0] = buf[0];
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conv->ostate = state;
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return count;
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}
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}
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/* Code set 1 (GB 2312-1980) */
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ret = gb2312_wctomb(conv,buf,wc,2);
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if (ret != RET_ILUNI) {
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if (ret != 2) abort();
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if (buf[0] < 0x80 && buf[1] < 0x80) {
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int count = (state ? 2 : 4);
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if (n < count)
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return RET_TOOSMALL;
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if (!state) {
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r[0] = '~';
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r[1] = '{';
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r += 2;
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state = 1;
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}
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r[0] = buf[0];
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r[1] = buf[1];
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conv->ostate = state;
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return count;
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}
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}
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return RET_ILUNI;
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}
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static int
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hz_reset (conv_t conv, unsigned char *r, size_t n)
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{
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state_t state = conv->ostate;
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if (state) {
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if (n < 2)
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return RET_TOOSMALL;
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r[0] = '~';
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r[1] = '}';
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/* conv->ostate = 0; will be done by the caller */
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return 2;
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} else
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return 0;
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}
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