lib/cp936ext.h

   1 /*
   2  * Copyright (C) 1999-2001, 2016 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 Lesser General Public
   7  * License as published by the Free Software Foundation; either version 2.1
   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  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
  17  * If not, see <https://www.gnu.org/licenses/>.
  18  */
  19
  20 /*
  21  * CP936 extensions
  22  */
  23
  24 static const unsigned short cp936ext_2uni_pagea6[181-159] = {
  25   /* 0xa6 */
  26                                                           0xfe35,
  27   0xfe36, 0xfe39, 0xfe3a, 0xfe3f, 0xfe40, 0xfe3d, 0xfe3e, 0xfe41,
  28   0xfe42, 0xfe43, 0xfe44, 0xfffd, 0xfffd, 0xfe3b, 0xfe3c, 0xfe37,
  29   0xfe38, 0xfe31, 0xfffd, 0xfe33, 0xfe34,
  30 };
  31 static const unsigned short cp936ext_2uni_pagea8[128-122] = {
  32   /* 0xa8 */
  33                   0x0251, 0xfffd, 0x0144, 0x0148, 0xfffd, 0x0261,
  34 };
  35
  36 static int
  37 cp936ext_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
  38 {
  39   unsigned char c1 = s[0];
  40   if ((c1 == 0xa6) || (c1 == 0xa8)) {
  41     if (n >= 2) {
  42       unsigned char c2 = s[1];
  43       if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0x80 && c2 < 0xff)) {
  44         unsigned int i = 190 * (c1 - 0x81) + (c2 - (c2 >= 0x80 ? 0x41 : 0x40));
  45         unsigned short wc = 0xfffd;
  46         if (i < 7410) {
  47           if (i >= 7189 && i < 7211)
  48             wc = cp936ext_2uni_pagea6[i-7189];
  49         } else {
  50           if (i >= 7532 && i < 7538)
  51             wc = cp936ext_2uni_pagea8[i-7532];
  52         }
  53         if (wc != 0xfffd) {
  54           *pwc = (ucs4_t) wc;
  55           return 2;
  56         }
  57       }
  58       return RET_ILSEQ;
  59     }
  60     return RET_TOOFEW(0);
  61   }
  62   return RET_ILSEQ;
  63 }
  64
  65 static const unsigned short cp936ext_page01[16] = {
  66   0x0000, 0x0000, 0x0000, 0x0000, 0xa8bd, 0x0000, 0x0000, 0x0000, /*0x40-0x47*/
  67   0xa8be, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, /*0x48-0x4f*/
  68 };
  69 static const unsigned short cp936ext_page02[24] = {
  70   0x0000, 0xa8bb, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, /*0x50-0x57*/
  71   0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, /*0x58-0x5f*/
  72   0x0000, 0xa8c0, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, /*0x60-0x67*/
  73 };
  74 static const unsigned short cp936ext_pagefe[24] = {
  75   0x0000, 0xa6f2, 0x0000, 0xa6f4, 0xa6f5, 0xa6e0, 0xa6e1, 0xa6f0, /*0x30-0x37*/
  76   0xa6f1, 0xa6e2, 0xa6e3, 0xa6ee, 0xa6ef, 0xa6e6, 0xa6e7, 0xa6e4, /*0x38-0x3f*/
  77   0xa6e5, 0xa6e8, 0xa6e9, 0xa6ea, 0xa6eb, 0x0000, 0x0000, 0x0000, /*0x40-0x47*/
  78 };
  79
  80 static int
  81 cp936ext_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
  82 {
  83   if (n >= 2) {
  84     unsigned short c = 0;
  85     if (wc >= 0x0140 && wc < 0x0150)
  86       c = cp936ext_page01[wc-0x0140];
  87     else if (wc >= 0x0250 && wc < 0x0268)
  88       c = cp936ext_page02[wc-0x0250];
  89     else if (wc >= 0xfe30 && wc < 0xfe48)
  90       c = cp936ext_pagefe[wc-0xfe30];
  91     if (c != 0) {
  92       r[0] = (c >> 8); r[1] = (c & 0xff);
  93       return 2;
  94     }
  95     return RET_ILUNI;
  96   }
  97   return RET_TOOSMALL;
  98 }