/* * Copyright (C) 1999-2001 Free Software Foundation, Inc. * This file is part of the GNU LIBICONV Library. * * The GNU LIBICONV Library is free software; you can redistribute it * and/or modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * The GNU LIBICONV Library is distributed in the hope that it will be * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with the GNU LIBICONV Library; see the file COPYING.LIB. * If not, write to the Free Software Foundation, Inc., 59 Temple Place - * Suite 330, Boston, MA 02111-1307, USA. */ /* * GBK */ /* * GBK, as described in Ken Lunde's book, is an extension of GB 2312-1980 * (shifted by adding 0x8080 to the range 0xA1A1..0xFEFE, as used in EUC-CN). * It adds the following ranges: * * (part of GBK/1) 0xA2A1-0xA2AA Small Roman numerals * GBK/3 0x{81-A0}{40-7E,80-FE} 6080 new characters, all in Unicode * GBK/4 0x{AA-FE}{40-7E,80-A0} 8160 new characters, 8080 in Unicode * GBK/5 0x{A8-A9}{40-7E,80-A0} 166 new characters, 153 in Unicode */ /* * CP936 is nearly identical to GBK. It differs as follows: * * 1. Some characters in the GB2312 range are defined differently: * * code GB2312 CP936.TXT * 0xA1A4 0x30FB # KATAKANA MIDDLE DOT 0x00B7 # MIDDLE DOT * 0xA1AA 0x2015 # HORIZONTAL BAR 0x2014 # EM DASH * * 2. 19 characters added in the range 0xA6E0-0xA6F5. * * 3. 4 characters added in the range 0xA8BB-0xA8C0. */ /* * Since all three tables I have looked at * - the CP936 table by Microsoft, found on ftp.unicode.org, * - the GBK table by Sun, investigated on a Solaris 2.7 machine, * - the GBK tables by CWEX, found in the Big5+ package, * all include these CP936 extensions (the CWEX tables have additional * differences), I conclude that either Ken Lunde has overlooked some of * the differences between GB2312 and GBK, or he is right but the major * vendors don't care about it. In either case, CP936 is the de facto * standard under the name "GBK", and we should better support it. * * So in what follows, when we write "GBK" we always mean "CP936". */ #include "gbkext1.h" #include "gbkext2.h" #include "gbkext_inv.h" #include "cp936ext.h" static int gbk_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n) { unsigned char c = *s; if (c >= 0x81 && c < 0xff) { if (n < 2) return RET_TOOFEW(0); if (c >= 0xa1 && c <= 0xf7) { unsigned char c2 = s[1]; if (c == 0xa1) { if (c2 == 0xa4) { *pwc = 0x00b7; return 2; } if (c2 == 0xaa) { *pwc = 0x2014; return 2; } } if (c2 >= 0xa1 && c2 < 0xff) { unsigned char buf[2]; int ret; buf[0] = c-0x80; buf[1] = c2-0x80; ret = gb2312_mbtowc(conv,pwc,buf,2); if (ret != RET_ILSEQ) return ret; buf[0] = c; buf[1] = c2; ret = cp936ext_mbtowc(conv,pwc,buf,2); if (ret != RET_ILSEQ) return ret; } } if (c >= 0x81 && c <= 0xa0) return gbkext1_mbtowc(conv,pwc,s,2); if (c >= 0xa8 && c <= 0xfe) return gbkext2_mbtowc(conv,pwc,s,2); if (c == 0xa2) { unsigned char c2 = s[1]; if (c2 >= 0xa1 && c2 <= 0xaa) { *pwc = 0x2170+(c2-0xa1); return 2; } } } return RET_ILSEQ; } static int gbk_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n) { unsigned char buf[2]; int ret; if (wc != 0x30fb && wc != 0x2015) { ret = gb2312_wctomb(conv,buf,wc,2); if (ret != RET_ILUNI) { if (ret != 2) abort(); if (n < 2) return RET_TOOSMALL; r[0] = buf[0]+0x80; r[1] = buf[1]+0x80; return 2; } } ret = gbkext_inv_wctomb(conv,buf,wc,2); if (ret != RET_ILUNI) { if (ret != 2) abort(); if (n < 2) return RET_TOOSMALL; r[0] = buf[0]; r[1] = buf[1]; return 2; } if (wc >= 0x2170 && wc <= 0x2179) { r[0] = 0xa2; r[1] = 0xa1 + (wc-0x2170); return 2; } ret = cp936ext_wctomb(conv,buf,wc,2); if (ret != RET_ILUNI) { if (ret != 2) abort(); if (n < 2) return RET_TOOSMALL; r[0] = buf[0]; r[1] = buf[1]; return 2; } if (wc == 0x00b7) { if (n < 2) return RET_TOOSMALL; r[0] = 0xa1; r[1] = 0xa4; return 2; } if (wc == 0x2014) { if (n < 2) return RET_TOOSMALL; r[0] = 0xa1; r[1] = 0xaa; return 2; } return RET_ILUNI; }