forked from mia/Aegisub
324 lines
8.1 KiB
C
324 lines
8.1 KiB
C
/*
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* Copyright (C) 1999-2001, 2008 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 Library General Public
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* License as published by the Free Software Foundation; either version 2
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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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with the GNU LIBICONV Library; see the file COPYING.LIB.
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* If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
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* Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/*
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* ISO-2022-CN
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*/
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/* Specification: RFC 1922 */
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#define ESC 0x1b
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#define SO 0x0e
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#define SI 0x0f
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/*
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* The state is composed of one of the following values
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*/
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#define STATE_ASCII 0
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#define STATE_TWOBYTE 1
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/*
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* and one of the following values, << 8
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*/
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#define STATE2_NONE 0
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#define STATE2_DESIGNATED_GB2312 1
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#define STATE2_DESIGNATED_CNS11643_1 2
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/*
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* and one of the following values, << 16
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*/
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#define STATE3_NONE 0
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#define STATE3_DESIGNATED_CNS11643_2 1
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#define SPLIT_STATE \
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unsigned int state1 = state & 0xff, state2 = (state >> 8) & 0xff, state3 = state >> 16
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#define COMBINE_STATE \
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state = (state3 << 16) | (state2 << 8) | state1
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static int
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iso2022_cn_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
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{
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state_t state = conv->istate;
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SPLIT_STATE;
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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 == ESC) {
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if (n < count+4)
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goto none;
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if (s[1] == '$') {
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if (s[2] == ')') {
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if (s[3] == 'A') {
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state2 = STATE2_DESIGNATED_GB2312;
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s += 4; count += 4;
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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 (s[3] == 'G') {
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state2 = STATE2_DESIGNATED_CNS11643_1;
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s += 4; count += 4;
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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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if (s[2] == '*') {
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if (s[3] == 'H') {
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state3 = STATE3_DESIGNATED_CNS11643_2;
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s += 4; count += 4;
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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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}
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if (s[1] == 'N') {
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switch (state3) {
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case STATE3_NONE:
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goto ilseq;
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case STATE3_DESIGNATED_CNS11643_2:
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if (s[2] < 0x80 && s[3] < 0x80) {
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int ret = cns11643_2_mbtowc(conv,pwc,s+2,2);
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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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COMBINE_STATE;
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conv->istate = state;
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return count+4;
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} else
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goto ilseq;
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default: abort();
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}
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}
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goto ilseq;
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}
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if (c == SO) {
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if (state2 != STATE2_DESIGNATED_GB2312 && state2 != STATE2_DESIGNATED_CNS11643_1)
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goto ilseq;
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state1 = STATE_TWOBYTE;
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s++; count++;
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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 == SI) {
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state1 = STATE_ASCII;
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s++; count++;
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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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break;
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}
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switch (state1) {
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case STATE_ASCII:
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if (c < 0x80) {
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int ret = ascii_mbtowc(conv,pwc,s,1);
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if (ret == RET_ILSEQ)
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goto ilseq;
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if (ret != 1) abort();
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if (*pwc == 0x000a || *pwc == 0x000d) {
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state2 = STATE2_NONE; state3 = STATE3_NONE;
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}
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COMBINE_STATE;
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conv->istate = state;
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return count+1;
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} else
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goto ilseq;
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case STATE_TWOBYTE:
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if (n < count+2)
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goto none;
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if (s[0] < 0x80 && s[1] < 0x80) {
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int ret;
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switch (state2) {
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case STATE2_NONE:
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goto ilseq;
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case STATE2_DESIGNATED_GB2312:
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ret = gb2312_mbtowc(conv,pwc,s,2); break;
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case STATE2_DESIGNATED_CNS11643_1:
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ret = cns11643_1_mbtowc(conv,pwc,s,2); break;
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default: abort();
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}
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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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COMBINE_STATE;
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conv->istate = state;
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return count+2;
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} else
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goto ilseq;
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default: abort();
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}
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none:
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COMBINE_STATE;
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conv->istate = state;
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return RET_TOOFEW(count);
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ilseq:
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COMBINE_STATE;
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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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iso2022_cn_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
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{
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state_t state = conv->ostate;
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SPLIT_STATE;
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unsigned char buf[3];
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int ret;
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/* There is no need to handle Unicode 3.1 tag characters and to look for
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"zh-CN" or "zh-TW" tags, because GB2312 and CNS11643 are disjoint. */
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/* Try ASCII. */
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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 = (state1 == STATE_ASCII ? 1 : 2);
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if (n < count)
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return RET_TOOSMALL;
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if (state1 != STATE_ASCII) {
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r[0] = SI;
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r += 1;
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state1 = STATE_ASCII;
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}
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r[0] = buf[0];
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if (wc == 0x000a || wc == 0x000d) {
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state2 = STATE2_NONE; state3 = STATE3_NONE;
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}
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COMBINE_STATE;
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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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/* Try 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 = (state2 == STATE2_DESIGNATED_GB2312 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
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if (n < count)
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return RET_TOOSMALL;
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if (state2 != STATE2_DESIGNATED_GB2312) {
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r[0] = ESC;
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r[1] = '$';
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r[2] = ')';
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r[3] = 'A';
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r += 4;
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state2 = STATE2_DESIGNATED_GB2312;
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}
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if (state1 != STATE_TWOBYTE) {
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r[0] = SO;
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r += 1;
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state1 = STATE_TWOBYTE;
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}
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r[0] = buf[0];
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r[1] = buf[1];
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COMBINE_STATE;
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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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ret = cns11643_wctomb(conv,buf,wc,3);
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if (ret != RET_ILUNI) {
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if (ret != 3) abort();
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/* Try CNS 11643-1992 Plane 1. */
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if (buf[0] == 1 && buf[1] < 0x80 && buf[2] < 0x80) {
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int count = (state2 == STATE2_DESIGNATED_CNS11643_1 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
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if (n < count)
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return RET_TOOSMALL;
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if (state2 != STATE2_DESIGNATED_CNS11643_1) {
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r[0] = ESC;
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r[1] = '$';
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r[2] = ')';
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r[3] = 'G';
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r += 4;
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state2 = STATE2_DESIGNATED_CNS11643_1;
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}
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if (state1 != STATE_TWOBYTE) {
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r[0] = SO;
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r += 1;
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state1 = STATE_TWOBYTE;
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}
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r[0] = buf[1];
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r[1] = buf[2];
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COMBINE_STATE;
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conv->ostate = state;
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return count;
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}
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/* Try CNS 11643-1992 Plane 2. */
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if (buf[0] == 2 && buf[1] < 0x80 && buf[2] < 0x80) {
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int count = (state3 == STATE3_DESIGNATED_CNS11643_2 ? 0 : 4) + 4;
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if (n < count)
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return RET_TOOSMALL;
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if (state3 != STATE3_DESIGNATED_CNS11643_2) {
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r[0] = ESC;
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r[1] = '$';
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r[2] = '*';
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r[3] = 'H';
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r += 4;
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state3 = STATE3_DESIGNATED_CNS11643_2;
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}
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r[0] = ESC;
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r[1] = 'N';
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r[2] = buf[1];
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r[3] = buf[2];
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COMBINE_STATE;
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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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iso2022_cn_reset (conv_t conv, unsigned char *r, int n)
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{
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state_t state = conv->ostate;
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SPLIT_STATE;
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(void)state2;
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(void)state3;
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if (state1 != STATE_ASCII) {
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if (n < 1)
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return RET_TOOSMALL;
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r[0] = SI;
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/* conv->ostate = 0; will be done by the caller */
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return 1;
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} else
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return 0;
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}
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#undef COMBINE_STATE
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#undef SPLIT_STATE
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#undef STATE3_DESIGNATED_CNS11643_2
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#undef STATE3_NONE
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#undef STATE2_DESIGNATED_CNS11643_1
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#undef STATE2_DESIGNATED_GB2312
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#undef STATE2_NONE
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#undef STATE_TWOBYTE
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#undef STATE_ASCII
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