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    1: /*
    2:  * Copyright (C) 1999-2001 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 extensions
   23:  */
   24: 
   25: static const unsigned short cp936ext_2uni_pagea6[181-159] = {
   26:   /* 0xa6 */
   27:                                                           0xfe35,
   28:   0xfe36, 0xfe39, 0xfe3a, 0xfe3f, 0xfe40, 0xfe3d, 0xfe3e, 0xfe41,
   29:   0xfe42, 0xfe43, 0xfe44, 0xfffd, 0xfffd, 0xfe3b, 0xfe3c, 0xfe37,
   30:   0xfe38, 0xfe31, 0xfffd, 0xfe33, 0xfe34,
   31: };
   32: static const unsigned short cp936ext_2uni_pagea8[128-122] = {
   33:   /* 0xa8 */
   34:                   0x0251, 0xfffd, 0x0144, 0x0148, 0xfffd, 0x0261,
   35: };
   36: 
   37: static int
   38: cp936ext_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
   39: {
   40:   unsigned char c1 = s[0];
   41:   if ((c1 == 0xa6) || (c1 == 0xa8)) {
   42:     if (n >= 2) {
   43:       unsigned char c2 = s[1];
   44:       if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0x80 && c2 < 0xff)) {
   45:         unsigned int i = 190 * (c1 - 0x81) + (c2 - (c2 >= 0x80 ? 0x41 : 0x40));
   46:         unsigned short wc = 0xfffd;
   47:         if (i < 7410) {
   48:           if (i >= 7189 && i < 7211)
   49:             wc = cp936ext_2uni_pagea6[i-7189];
   50:         } else {
   51:           if (i >= 7532 && i < 7538)
   52:             wc = cp936ext_2uni_pagea8[i-7532];
   53:         }
   54:         if (wc != 0xfffd) {
   55:           *pwc = (ucs4_t) wc;
   56:           return 2;
   57:         }
   58:       }
   59:       return RET_ILSEQ;
   60:     }
   61:     return RET_TOOFEW(0);
   62:   }
   63:   return RET_ILSEQ;
   64: }
   65: 
   66: static const unsigned short cp936ext_page01[16] = {
   67:   0x0000, 0x0000, 0x0000, 0x0000, 0xa8bd, 0x0000, 0x0000, 0x0000, /*0x40-0x47*/
   68:   0xa8be, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, /*0x48-0x4f*/
   69: };
   70: static const unsigned short cp936ext_page02[24] = {
   71:   0x0000, 0xa8bb, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, /*0x50-0x57*/
   72:   0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, /*0x58-0x5f*/
   73:   0x0000, 0xa8c0, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, /*0x60-0x67*/
   74: };
   75: static const unsigned short cp936ext_pagefe[24] = {
   76:   0x0000, 0xa6f2, 0x0000, 0xa6f4, 0xa6f5, 0xa6e0, 0xa6e1, 0xa6f0, /*0x30-0x37*/
   77:   0xa6f1, 0xa6e2, 0xa6e3, 0xa6ee, 0xa6ef, 0xa6e6, 0xa6e7, 0xa6e4, /*0x38-0x3f*/
   78:   0xa6e5, 0xa6e8, 0xa6e9, 0xa6ea, 0xa6eb, 0x0000, 0x0000, 0x0000, /*0x40-0x47*/
   79: };
   80: 
   81: static int
   82: cp936ext_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
   83: {
   84:   if (n >= 2) {
   85:     unsigned short c = 0;
   86:     if (wc >= 0x0140 && wc < 0x0150)
   87:       c = cp936ext_page01[wc-0x0140];
   88:     else if (wc >= 0x0250 && wc < 0x0268)
   89:       c = cp936ext_page02[wc-0x0250];
   90:     else if (wc >= 0xfe30 && wc < 0xfe48)
   91:       c = cp936ext_pagefe[wc-0xfe30];
   92:     if (c != 0) {
   93:       r[0] = (c >> 8); r[1] = (c & 0xff);
   94:       return 2;
   95:     }
   96:     return RET_ILUNI;
   97:   }
   98:   return RET_TOOSMALL;
   99: }