forked from mia/Aegisub
310 lines
9.6 KiB
C
310 lines
9.6 KiB
C
/*
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* Copyright (C) 1999-2002 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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* SHIFT_JISX0213
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*/
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/* The structure of Shift_JISX0213 is as follows:
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0x00..0x7F: ISO646-JP, an ASCII variant
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0x{A1..DF}: JISX0201 Katakana.
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0x{81..9F,E0..EF}{40..7E,80..FC}: JISX0213 plane 1.
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0x{F0..FC}{40..7E,80..FC}: JISX0213 plane 2, with irregular row mapping.
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Note that some JISX0213 characters are not contained in Unicode 3.2
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and are therefore best represented as sequences of Unicode characters.
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*/
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#include "jisx0213.h"
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#include "flushwc.h"
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static int
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shift_jisx0213_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
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{
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ucs4_t last_wc = conv->istate;
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if (last_wc) {
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/* Output the buffered character. */
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conv->istate = 0;
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*pwc = last_wc;
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return 0; /* Don't advance the input pointer. */
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} else {
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unsigned char c = *s;
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if (c < 0x80) {
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/* Plain ISO646-JP character. */
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if (c == 0x5c)
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*pwc = (ucs4_t) 0x00a5;
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else if (c == 0x7e)
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*pwc = (ucs4_t) 0x203e;
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else
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*pwc = (ucs4_t) c;
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return 1;
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} else if (c >= 0xa1 && c <= 0xdf) {
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*pwc = c + 0xfec0;
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return 1;
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} else {
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if ((c >= 0x81 && c <= 0x9f) || (c >= 0xe0 && c <= 0xfc)) {
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/* Two byte character. */
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if (n >= 2) {
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unsigned char c2 = s[1];
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if ((c2 >= 0x40 && c2 <= 0x7e) || (c2 >= 0x80 && c2 <= 0xfc)) {
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unsigned int c1;
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ucs4_t wc;
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/* Convert to row and column. */
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if (c < 0xe0)
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c -= 0x81;
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else
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c -= 0xc1;
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if (c2 < 0x80)
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c2 -= 0x40;
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else
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c2 -= 0x41;
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/* Now 0 <= c <= 0x3b, 0 <= c2 <= 0xbb. */
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c1 = 2 * c;
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if (c2 >= 0x5e)
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c2 -= 0x5e, c1++;
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c2 += 0x21;
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if (c1 >= 0x5e) {
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/* Handling of JISX 0213 plane 2 rows. */
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if (c1 >= 0x67)
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c1 += 230;
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else if (c1 >= 0x63 || c1 == 0x5f)
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c1 += 168;
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else
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c1 += 162;
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}
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wc = jisx0213_to_ucs4(0x121+c1,c2);
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if (wc) {
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if (wc < 0x80) {
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/* It's a combining character. */
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ucs4_t wc1 = jisx0213_to_ucs_combining[wc - 1][0];
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ucs4_t wc2 = jisx0213_to_ucs_combining[wc - 1][1];
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/* We cannot output two Unicode characters at once. So,
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output the first character and buffer the second one. */
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*pwc = wc1;
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conv->istate = wc2;
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} else
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*pwc = wc;
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return 2;
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}
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}
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} else
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return RET_TOOFEW(0);
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}
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return RET_ILSEQ;
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}
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}
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}
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#define shift_jisx0213_flushwc normal_flushwc
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/* Composition tables for each of the relevant combining characters. */
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static const struct { unsigned short base; unsigned short composed; } shift_jisx0213_comp_table_data[] = {
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#define shift_jisx0213_comp_table02e5_idx 0
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#define shift_jisx0213_comp_table02e5_len 1
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{ 0x8684, 0x8685 }, /* 0x12B65 = 0x12B64 U+02E5 */
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#define shift_jisx0213_comp_table02e9_idx (shift_jisx0213_comp_table02e5_idx+shift_jisx0213_comp_table02e5_len)
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#define shift_jisx0213_comp_table02e9_len 1
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{ 0x8680, 0x8686 }, /* 0x12B66 = 0x12B60 U+02E9 */
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#define shift_jisx0213_comp_table0300_idx (shift_jisx0213_comp_table02e9_idx+shift_jisx0213_comp_table02e9_len)
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#define shift_jisx0213_comp_table0300_len 5
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{ 0x857b, 0x8663 }, /* 0x12B44 = 0x1295C U+0300 */
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{ 0x8657, 0x8667 }, /* 0x12B48 = 0x12B38 U+0300 */
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{ 0x8656, 0x8669 }, /* 0x12B4A = 0x12B37 U+0300 */
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{ 0x864f, 0x866b }, /* 0x12B4C = 0x12B30 U+0300 */
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{ 0x8662, 0x866d }, /* 0x12B4E = 0x12B43 U+0300 */
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#define shift_jisx0213_comp_table0301_idx (shift_jisx0213_comp_table0300_idx+shift_jisx0213_comp_table0300_len)
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#define shift_jisx0213_comp_table0301_len 4
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{ 0x8657, 0x8668 }, /* 0x12B49 = 0x12B38 U+0301 */
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{ 0x8656, 0x866a }, /* 0x12B4B = 0x12B37 U+0301 */
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{ 0x864f, 0x866c }, /* 0x12B4D = 0x12B30 U+0301 */
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{ 0x8662, 0x866e }, /* 0x12B4F = 0x12B43 U+0301 */
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#define shift_jisx0213_comp_table309a_idx (shift_jisx0213_comp_table0301_idx+shift_jisx0213_comp_table0301_len)
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#define shift_jisx0213_comp_table309a_len 14
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{ 0x82a9, 0x82f5 }, /* 0x12477 = 0x1242B U+309A */
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{ 0x82ab, 0x82f6 }, /* 0x12478 = 0x1242D U+309A */
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{ 0x82ad, 0x82f7 }, /* 0x12479 = 0x1242F U+309A */
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{ 0x82af, 0x82f8 }, /* 0x1247A = 0x12431 U+309A */
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{ 0x82b1, 0x82f9 }, /* 0x1247B = 0x12433 U+309A */
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{ 0x834a, 0x8397 }, /* 0x12577 = 0x1252B U+309A */
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{ 0x834c, 0x8398 }, /* 0x12578 = 0x1252D U+309A */
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{ 0x834e, 0x8399 }, /* 0x12579 = 0x1252F U+309A */
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{ 0x8350, 0x839a }, /* 0x1257A = 0x12531 U+309A */
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{ 0x8352, 0x839b }, /* 0x1257B = 0x12533 U+309A */
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{ 0x835a, 0x839c }, /* 0x1257C = 0x1253B U+309A */
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{ 0x8363, 0x839d }, /* 0x1257D = 0x12544 U+309A */
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{ 0x8367, 0x839e }, /* 0x1257E = 0x12548 U+309A */
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{ 0x83f3, 0x83f6 }, /* 0x12678 = 0x12675 U+309A */
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};
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static int
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shift_jisx0213_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
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{
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int count = 0;
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unsigned short lasttwo = conv->ostate;
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if (lasttwo) {
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/* Attempt to combine the last character with this one. */
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unsigned int idx;
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unsigned int len;
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if (wc == 0x02e5)
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idx = shift_jisx0213_comp_table02e5_idx,
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len = shift_jisx0213_comp_table02e5_len;
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else if (wc == 0x02e9)
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idx = shift_jisx0213_comp_table02e9_idx,
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len = shift_jisx0213_comp_table02e9_len;
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else if (wc == 0x0300)
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idx = shift_jisx0213_comp_table0300_idx,
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len = shift_jisx0213_comp_table0300_len;
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else if (wc == 0x0301)
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idx = shift_jisx0213_comp_table0301_idx,
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len = shift_jisx0213_comp_table0301_len;
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else if (wc == 0x309a)
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idx = shift_jisx0213_comp_table309a_idx,
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len = shift_jisx0213_comp_table309a_len;
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else
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goto not_combining;
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do
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if (shift_jisx0213_comp_table_data[idx].base == lasttwo)
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break;
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while (++idx, --len > 0);
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if (len > 0) {
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/* Output the combined character. */
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if (n >= 2) {
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lasttwo = shift_jisx0213_comp_table_data[idx].composed;
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r[0] = (lasttwo >> 8) & 0xff;
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r[1] = lasttwo & 0xff;
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conv->ostate = 0;
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return 2;
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} else
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return RET_TOOSMALL;
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}
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not_combining:
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/* Output the buffered character. */
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if (n < 2)
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return RET_TOOSMALL;
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r[0] = (lasttwo >> 8) & 0xff;
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r[1] = lasttwo & 0xff;
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r += 2;
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count = 2;
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}
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if (wc < 0x80 && wc != 0x5c && wc != 0x7e) {
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/* Plain ISO646-JP character. */
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if (n > count) {
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r[0] = (unsigned char) wc;
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conv->ostate = 0;
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return count+1;
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} else
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return RET_TOOSMALL;
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} else if (wc == 0x00a5) {
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if (n > count) {
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r[0] = 0x5c;
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conv->ostate = 0;
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return count+1;
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} else
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return RET_TOOSMALL;
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} else if (wc == 0x203e) {
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if (n > count) {
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r[0] = 0x7e;
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conv->ostate = 0;
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return count+1;
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} else
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return RET_TOOSMALL;
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} else if (wc >= 0xff61 && wc <= 0xff9f) {
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/* Half-width katakana. */
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if (n > count) {
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r[0] = wc - 0xfec0;
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conv->ostate = 0;
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return count+1;
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} else
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return RET_TOOSMALL;
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} else {
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unsigned int s1, s2;
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unsigned short jch = ucs4_to_jisx0213(wc);
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if (jch != 0) {
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/* Convert it to shifted representation. */
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s1 = jch >> 8;
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s2 = jch & 0x7f;
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s1 -= 0x21;
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s2 -= 0x21;
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if (s1 >= 0x5e) {
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/* Handling of JISX 0213 plane 2 rows. */
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if (s1 >= 0xcd) /* rows 0x26E..0x27E */
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s1 -= 102;
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else if (s1 >= 0x8b || s1 == 0x87) /* rows 0x228, 0x22C..0x22F */
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s1 -= 40;
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else /* rows 0x221, 0x223..0x225 */
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s1 -= 34;
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/* Now 0x5e <= s1 <= 0x77. */
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}
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if (s1 & 1)
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s2 += 0x5e;
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s1 = s1 >> 1;
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if (s1 < 0x1f)
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s1 += 0x81;
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else
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s1 += 0xc1;
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if (s2 < 0x3f)
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s2 += 0x40;
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else
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s2 += 0x41;
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if (jch & 0x0080) {
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/* A possible match in comp_table_data. We have to buffer it. */
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/* We know it's a JISX 0213 plane 1 character. */
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if (jch & 0x8000) abort();
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conv->ostate = (s1 << 8) | s2;
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return count+0;
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}
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/* Output the shifted representation. */
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if (n >= count+2) {
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r[0] = s1;
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r[1] = s2;
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conv->ostate = 0;
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return count+2;
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} else
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return RET_TOOSMALL;
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}
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return RET_ILUNI;
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}
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}
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static int
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shift_jisx0213_reset (conv_t conv, unsigned char *r, int n)
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{
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state_t lasttwo = conv->ostate;
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if (lasttwo) {
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if (n < 2)
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return RET_TOOSMALL;
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r[0] = (lasttwo >> 8) & 0xff;
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r[1] = lasttwo & 0xff;
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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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