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263 lines
6.3 KiB
263 lines
6.3 KiB
/* |
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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 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, see <http://www.gnu.org/licenses/>. |
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*/ |
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/* |
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* ISO-2022-JP-1 |
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*/ |
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/* Specification: RFC 2237 */ |
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#define ESC 0x1b |
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/* |
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* The state can be one of the following values. |
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*/ |
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#define STATE_ASCII 0 |
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#define STATE_JISX0201ROMAN 1 |
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#define STATE_JISX0208 2 |
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#define STATE_JISX0212 3 |
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static int |
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iso2022_jp1_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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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+3) |
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goto none; |
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if (s[1] == '(') { |
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if (s[2] == 'B') { |
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state = STATE_ASCII; |
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s += 3; count += 3; |
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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[2] == 'J') { |
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state = STATE_JISX0201ROMAN; |
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s += 3; count += 3; |
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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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goto ilseq; |
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} |
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if (s[1] == '$') { |
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if (s[2] == '@' || s[2] == 'B') { |
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/* We don't distinguish JIS X 0208-1978 and JIS X 0208-1983. */ |
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state = STATE_JISX0208; |
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s += 3; count += 3; |
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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[2] == '(') { |
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if (n < count+4) |
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goto none; |
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if (s[3] == 'D') { |
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state = STATE_JISX0212; |
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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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goto ilseq; |
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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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switch (state) { |
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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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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_JISX0201ROMAN: |
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if (c < 0x80) { |
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int ret = jisx0201_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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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_JISX0208: |
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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 = jisx0208_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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} else |
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goto ilseq; |
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case STATE_JISX0212: |
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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 = jisx0212_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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} 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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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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iso2022_jp1_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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/* 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 = (state == STATE_ASCII ? 1 : 4); |
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if (n < count) |
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return RET_TOOSMALL; |
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if (state != STATE_ASCII) { |
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r[0] = ESC; |
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r[1] = '('; |
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r[2] = 'B'; |
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r += 3; |
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state = STATE_ASCII; |
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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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/* Try JIS X 0201-1976 Roman. */ |
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ret = jisx0201_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 == STATE_JISX0201ROMAN ? 1 : 4); |
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if (n < count) |
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return RET_TOOSMALL; |
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if (state != STATE_JISX0201ROMAN) { |
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r[0] = ESC; |
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r[1] = '('; |
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r[2] = 'J'; |
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r += 3; |
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state = STATE_JISX0201ROMAN; |
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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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/* Try JIS X 0208-1990 in place of JIS X 0208-1978 and JIS X 0208-1983. */ |
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ret = jisx0208_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 == STATE_JISX0208 ? 2 : 5); |
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if (n < count) |
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return RET_TOOSMALL; |
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if (state != STATE_JISX0208) { |
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r[0] = ESC; |
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r[1] = '$'; |
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r[2] = 'B'; |
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r += 3; |
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state = STATE_JISX0208; |
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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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/* Try JIS X 0212-1990. */ |
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ret = jisx0212_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 == STATE_JISX0212 ? 2 : 6); |
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if (n < count) |
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return RET_TOOSMALL; |
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if (state != STATE_JISX0212) { |
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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] = 'D'; |
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r += 4; |
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state = STATE_JISX0212; |
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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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iso2022_jp1_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 != STATE_ASCII) { |
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if (n < 3) |
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return RET_TOOSMALL; |
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r[0] = ESC; |
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r[1] = '('; |
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r[2] = 'B'; |
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/* conv->ostate = 0; will be done by the caller */ |
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return 3; |
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} else |
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return 0; |
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} |
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#undef STATE_JISX0212 |
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#undef STATE_JISX0208 |
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#undef STATE_JISX0201ROMAN |
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#undef STATE_ASCII
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