Return to cp936.h CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / libiconv / lib

Annotation of embedaddon/libiconv/lib/cp936.h, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (C) 2005 Free Software Foundation, Inc.
        !             3:  * This file is part of the GNU LIBICONV Library.
        !             4:  *
        !             5:  * The GNU LIBICONV Library is free software; you can redistribute it
        !             6:  * and/or modify it under the terms of the GNU Library General Public
        !             7:  * License as published by the Free Software Foundation; either version 2
        !             8:  * of the License, or (at your option) any later version.
        !             9:  *
        !            10:  * The GNU LIBICONV Library is distributed in the hope that it will be
        !            11:  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            12:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            13:  * Library General Public License for more details.
        !            14:  *
        !            15:  * You should have received a copy of the GNU Library General Public
        !            16:  * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
        !            17:  * If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
        !            18:  * Fifth Floor, Boston, MA 02110-1301, USA.
        !            19:  */
        !            20: 
        !            21: /*
        !            22:  * CP936
        !            23:  */
        !            24: 
        !            25: /*
        !            26:  * The IANA has CP936 as an alias of GBK. But GBK is an official Chinese
        !            27:  * specification, whereas CP936 is de-facto maintained by Microsoft. And,
        !            28:  * of course, Microsoft modified CP936 since 1999.
        !            29:  *
        !            30:  * The differences from GBK are:
        !            31:  *
        !            32:  * 1. A single character:
        !            33:  *
        !            34:  *    code   CP936.TXT
        !            35:  *    0x80   0x20AC # EURO SIGN
        !            36:  *
        !            37:  * Some variants of CP936 (in JDK, Windows-2000, ICU) also add:
        !            38:  *
        !            39:  * 2. Private area mappings:
        !            40:  *
        !            41:  *              code                 Unicode
        !            42:  *    0x{A1..A2}{40..7E,80..A0}  U+E4C6..U+E585
        !            43:  *    0x{AA..AF,F8..FE}{A1..FE}  U+E000..U+E4C5
        !            44:  *
        !            45:  * We add them too because, although there are backward compatibility problems
        !            46:  * when a character from a private area is moved to an official Unicode code
        !            47:  * point, they are useful for some people in practice.
        !            48:  */
        !            49: 
        !            50: static int
        !            51: cp936_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
        !            52: {
        !            53:   /* Try GBK first. */
        !            54:   {
        !            55:     int ret = ces_gbk_mbtowc(conv,pwc,s,n);
        !            56:     if (ret != RET_ILSEQ)
        !            57:       return ret;
        !            58:   }
        !            59:   /* Then handle the additional mappings. */
        !            60:   {
        !            61:     unsigned char c = *s;
        !            62:     if (c == 0x80) {
        !            63:       *pwc = 0x20ac;
        !            64:       return 1;
        !            65:     }
        !            66:     /* User-defined characters */
        !            67:     if (c >= 0xa1 && c <= 0xa2) {
        !            68:       if (n < 2)
        !            69:         return RET_TOOFEW(0);
        !            70:       {
        !            71:         unsigned char c2 = s[1];
        !            72:         if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0x80 && c2 < 0xa1)) {
        !            73:           *pwc = 0xe4c6 + 96 * (c - 0xa1) + (c2 - (c2 >= 0x80 ? 0x41 : 0x40));
        !            74:           return 2;
        !            75:         }
        !            76:       }
        !            77:     } else if ((c >= 0xaa && c < 0xb0) || (c >= 0xf8 && c < 0xff)) {
        !            78:       if (n < 2)
        !            79:         return RET_TOOFEW(0);
        !            80:       {
        !            81:         unsigned char c2 = s[1];
        !            82:         if (c2 >= 0xa1 && c2 < 0xff) {
        !            83:           *pwc = 0xe000 + 94 * (c - (c >= 0xf8 ? 0xf2 : 0xaa)) + (c2 - 0xa1);
        !            84:           return 2;
        !            85:         }
        !            86:       }
        !            87:     }
        !            88:   }
        !            89:   return RET_ILSEQ;
        !            90: }
        !            91: 
        !            92: static int
        !            93: cp936_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
        !            94: {
        !            95:   /* Try GBK first. */
        !            96:   {
        !            97:     int ret = ces_gbk_wctomb(conv,r,wc,n);
        !            98:     if (ret != RET_ILUNI)
        !            99:       return ret;
        !           100:   }
        !           101:   /* Then handle the additional mappings. */
        !           102:   if (wc >= 0xe000 && wc < 0xe586) {
        !           103:     /* User-defined characters */
        !           104:     if (n < 2)
        !           105:       return RET_TOOFEW(0);
        !           106:     if (wc < 0xe4c6) {
        !           107:       unsigned int i = wc - 0xe000;
        !           108:       unsigned int c1 = i / 94;
        !           109:       unsigned int c2 = i % 94;
        !           110:       r[0] = c1 + (c1 < 6 ? 0xaa : 0xf2);
        !           111:       r[1] = c2 + 0xa1;
        !           112:       return 2;
        !           113:     } else {
        !           114:       unsigned int i = wc - 0xe4c6;
        !           115:       unsigned int c1 = i / 96;
        !           116:       unsigned int c2 = i % 96;
        !           117:       r[0] = c1 + 0xa1;
        !           118:       r[1] = c2 + (c2 < 0x3f ? 0x40 : 0x41);
        !           119:       return 2;
        !           120:     }
        !           121:   } else if (wc == 0x20ac) {
        !           122:     r[0] = 0x80;
        !           123:     return 1;
        !           124:   }
        !           125:   return RET_ILUNI;
        !           126: }