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126 lines
3.5 KiB
C
126 lines
3.5 KiB
C
/*
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* Copyright (C) 2005, 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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* CP936
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*/
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/*
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* The IANA has CP936 as an alias of GBK. But GBK is an official Chinese
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* specification, whereas CP936 is de-facto maintained by Microsoft. And,
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* of course, Microsoft modified CP936 since 1999.
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*
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* The differences from GBK are:
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*
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* 1. A single character:
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*
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* code CP936.TXT
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* 0x80 0x20AC # EURO SIGN
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*
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* Some variants of CP936 (in JDK, Windows-2000, ICU) also add:
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*
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* 2. Private area mappings:
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*
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* code Unicode
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* 0x{A1..A2}{40..7E,80..A0} U+E4C6..U+E585
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* 0x{AA..AF,F8..FE}{A1..FE} U+E000..U+E4C5
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*
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* We add them too because, although there are backward compatibility problems
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* when a character from a private area is moved to an official Unicode code
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* point, they are useful for some people in practice.
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*/
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static int
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cp936_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
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{
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/* Try GBK first. */
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{
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int ret = ces_gbk_mbtowc(conv,pwc,s,n);
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if (ret != RET_ILSEQ)
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return ret;
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}
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/* Then handle the additional mappings. */
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{
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unsigned char c = *s;
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if (c == 0x80) {
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*pwc = 0x20ac;
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return 1;
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}
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/* User-defined characters */
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if (c >= 0xa1 && c <= 0xa2) {
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if (n < 2)
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return RET_TOOFEW(0);
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{
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unsigned char c2 = s[1];
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if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0x80 && c2 < 0xa1)) {
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*pwc = 0xe4c6 + 96 * (c - 0xa1) + (c2 - (c2 >= 0x80 ? 0x41 : 0x40));
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return 2;
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}
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}
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} else if ((c >= 0xaa && c < 0xb0) || (c >= 0xf8 && c < 0xff)) {
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if (n < 2)
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return RET_TOOFEW(0);
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{
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unsigned char c2 = s[1];
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if (c2 >= 0xa1 && c2 < 0xff) {
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*pwc = 0xe000 + 94 * (c - (c >= 0xf8 ? 0xf2 : 0xaa)) + (c2 - 0xa1);
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return 2;
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}
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}
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}
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}
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return RET_ILSEQ;
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}
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static int
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cp936_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
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{
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/* Try GBK first. */
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{
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int ret = ces_gbk_wctomb(conv,r,wc,n);
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if (ret != RET_ILUNI)
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return ret;
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}
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/* Then handle the additional mappings. */
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if (wc >= 0xe000 && wc < 0xe586) {
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/* User-defined characters */
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if (n < 2)
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return RET_TOOFEW(0);
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if (wc < 0xe4c6) {
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unsigned int i = wc - 0xe000;
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unsigned int c1 = i / 94;
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unsigned int c2 = i % 94;
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r[0] = c1 + (c1 < 6 ? 0xaa : 0xf2);
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r[1] = c2 + 0xa1;
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return 2;
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} else {
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unsigned int i = wc - 0xe4c6;
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unsigned int c1 = i / 96;
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unsigned int c2 = i % 96;
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r[0] = c1 + 0xa1;
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r[1] = c2 + (c2 < 0x3f ? 0x40 : 0x41);
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return 2;
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}
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} else if (wc == 0x20ac) {
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r[0] = 0x80;
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return 1;
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}
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return RET_ILUNI;
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}
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