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Annotation of embedaddon/libiconv/lib/cp936.h, revision 1.1.1.1

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: }