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 } 127