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269 lines
8.6 KiB
C
269 lines
8.6 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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* EUC-JISX0213
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*/
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/* The structure of EUC-JISX0213 is as follows:
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0x00..0x7F: ASCII
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0x8E{A1..FE}: JISX0201 Katakana, with prefix 0x8E, offset by +0x80.
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0x8F{A1..FE}{A1..FE}: JISX0213 plane 2, with prefix 0x8F, offset by +0x8080.
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0x{A1..FE}{A1..FE}: JISX0213 plane 1, offset by +0x8080.
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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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euc_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 ASCII character. */
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*pwc = (ucs4_t) c;
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return 1;
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} else {
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if ((c >= 0xa1 && c <= 0xfe) || c == 0x8e || c == 0x8f) {
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/* Two or three byte character. */
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if (n >= 2) {
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unsigned char c2 = s[1];
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if (c2 >= 0xa1 && c2 <= 0xfe) {
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if (c == 0x8e) {
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/* Half-width katakana. */
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if (c2 <= 0xdf) {
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*pwc = c2 + 0xfec0;
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return 2;
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}
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} else {
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ucs4_t wc;
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if (c == 0x8f) {
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/* JISX 0213 plane 2. */
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if (n >= 3) {
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unsigned char c3 = s[2];
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wc = jisx0213_to_ucs4(0x200-0x80+c2,c3^0x80);
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} else
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return RET_TOOFEW(0);
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} else {
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/* JISX 0213 plane 1. */
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wc = jisx0213_to_ucs4(0x100-0x80+c,c2^0x80);
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}
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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 (c == 0x8f ? 3 : 2);
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}
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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 euc_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; } euc_jisx0213_comp_table_data[] = {
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#define euc_jisx0213_comp_table02e5_idx 0
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#define euc_jisx0213_comp_table02e5_len 1
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{ 0xabe4, 0xabe5 }, /* 0x12B65 = 0x12B64 U+02E5 */
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#define euc_jisx0213_comp_table02e9_idx (euc_jisx0213_comp_table02e5_idx+euc_jisx0213_comp_table02e5_len)
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#define euc_jisx0213_comp_table02e9_len 1
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{ 0xabe0, 0xabe6 }, /* 0x12B66 = 0x12B60 U+02E9 */
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#define euc_jisx0213_comp_table0300_idx (euc_jisx0213_comp_table02e9_idx+euc_jisx0213_comp_table02e9_len)
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#define euc_jisx0213_comp_table0300_len 5
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{ 0xa9dc, 0xabc4 }, /* 0x12B44 = 0x1295C U+0300 */
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{ 0xabb8, 0xabc8 }, /* 0x12B48 = 0x12B38 U+0300 */
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{ 0xabb7, 0xabca }, /* 0x12B4A = 0x12B37 U+0300 */
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{ 0xabb0, 0xabcc }, /* 0x12B4C = 0x12B30 U+0300 */
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{ 0xabc3, 0xabce }, /* 0x12B4E = 0x12B43 U+0300 */
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#define euc_jisx0213_comp_table0301_idx (euc_jisx0213_comp_table0300_idx+euc_jisx0213_comp_table0300_len)
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#define euc_jisx0213_comp_table0301_len 4
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{ 0xabb8, 0xabc9 }, /* 0x12B49 = 0x12B38 U+0301 */
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{ 0xabb7, 0xabcb }, /* 0x12B4B = 0x12B37 U+0301 */
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{ 0xabb0, 0xabcd }, /* 0x12B4D = 0x12B30 U+0301 */
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{ 0xabc3, 0xabcf }, /* 0x12B4F = 0x12B43 U+0301 */
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#define euc_jisx0213_comp_table309a_idx (euc_jisx0213_comp_table0301_idx+euc_jisx0213_comp_table0301_len)
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#define euc_jisx0213_comp_table309a_len 14
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{ 0xa4ab, 0xa4f7 }, /* 0x12477 = 0x1242B U+309A */
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{ 0xa4ad, 0xa4f8 }, /* 0x12478 = 0x1242D U+309A */
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{ 0xa4af, 0xa4f9 }, /* 0x12479 = 0x1242F U+309A */
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{ 0xa4b1, 0xa4fa }, /* 0x1247A = 0x12431 U+309A */
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{ 0xa4b3, 0xa4fb }, /* 0x1247B = 0x12433 U+309A */
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{ 0xa5ab, 0xa5f7 }, /* 0x12577 = 0x1252B U+309A */
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{ 0xa5ad, 0xa5f8 }, /* 0x12578 = 0x1252D U+309A */
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{ 0xa5af, 0xa5f9 }, /* 0x12579 = 0x1252F U+309A */
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{ 0xa5b1, 0xa5fa }, /* 0x1257A = 0x12531 U+309A */
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{ 0xa5b3, 0xa5fb }, /* 0x1257B = 0x12533 U+309A */
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{ 0xa5bb, 0xa5fc }, /* 0x1257C = 0x1253B U+309A */
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{ 0xa5c4, 0xa5fd }, /* 0x1257D = 0x12544 U+309A */
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{ 0xa5c8, 0xa5fe }, /* 0x1257E = 0x12548 U+309A */
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{ 0xa6f5, 0xa6f8 }, /* 0x12678 = 0x12675 U+309A */
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};
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static int
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euc_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 = euc_jisx0213_comp_table02e5_idx,
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len = euc_jisx0213_comp_table02e5_len;
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else if (wc == 0x02e9)
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idx = euc_jisx0213_comp_table02e9_idx,
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len = euc_jisx0213_comp_table02e9_len;
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else if (wc == 0x0300)
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idx = euc_jisx0213_comp_table0300_idx,
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len = euc_jisx0213_comp_table0300_len;
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else if (wc == 0x0301)
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idx = euc_jisx0213_comp_table0301_idx,
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len = euc_jisx0213_comp_table0301_len;
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else if (wc == 0x309a)
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idx = euc_jisx0213_comp_table309a_idx,
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len = euc_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 (euc_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 = euc_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) {
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/* Plain ASCII 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 >= 0xff61 && wc <= 0xff9f) {
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/* Half-width katakana. */
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if (n >= count+2) {
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r[0] = 0x8e;
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r[1] = wc - 0xfec0;
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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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} else {
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unsigned short jch = ucs4_to_jisx0213(wc);
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if (jch != 0) {
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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 = jch | 0x8080;
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return count+0;
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}
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if (jch & 0x8000) {
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/* JISX 0213 plane 2. */
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if (n >= count+3) {
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r[0] = 0x8f;
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r[1] = (jch >> 8) | 0x80;
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r[2] = (jch & 0xff) | 0x80;
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conv->ostate = 0;
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return count+3;
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} else
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return RET_TOOSMALL;
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} else {
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/* JISX 0213 plane 1. */
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if (n >= count+2) {
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r[0] = (jch >> 8) | 0x80;
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r[1] = (jch & 0xff) | 0x80;
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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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}
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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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euc_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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