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., 59 Temple Place - 18 * Suite 330, Boston, MA 02111-1307, USA. 19 */ 20 21/* 22 * HZ 23 */ 24 25/* Specification: RFC 1842, RFC 1843 */ 26 27/* 28 * The state is 1 in GB mode, 0 in ASCII mode. 29 */ 30 31static int 32hz_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n) 33{ 34 state_t state = conv->istate; 35 unsigned int count = 0; 36 unsigned char c; 37 for (;;) { 38 c = *s; 39 if (c == '~') { 40 if (n < count+2) 41 goto none; 42 c = s[1]; 43 if (state == 0) { 44 if (c == '~') { 45 *pwc = (ucs4_t) '~'; 46 conv->istate = state; 47 return count+2; 48 } 49 if (c == '{') { 50 state = 1; 51 s += 2; count += 2; 52 if (n < count+1) 53 goto none; 54 continue; 55 } 56 if (c == '\n') { 57 s += 2; count += 2; 58 if (n < count+1) 59 goto none; 60 continue; 61 } 62 } else { 63 if (c == '}') { 64 state = 0; 65 s += 2; count += 2; 66 if (n < count+1) 67 goto none; 68 continue; 69 } 70 } 71 return RET_ILSEQ; 72 } 73 break; 74 } 75 if (state == 0) { 76 *pwc = (ucs4_t) c; 77 conv->istate = state; 78 return count+1; 79 } else { 80 int ret; 81 if (n < count+2) 82 goto none; 83 ret = gb2312_mbtowc(conv,pwc,s,2); 84 if (ret == RET_ILSEQ) 85 return RET_ILSEQ; 86 if (ret != 2) abort(); 87 conv->istate = state; 88 return count+2; 89 } 90 91none: 92 conv->istate = state; 93 return RET_TOOFEW(count); 94} 95 96static int 97hz_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n) 98{ 99 state_t state = conv->ostate; 100 unsigned char buf[2]; 101 int ret; 102 103 /* Code set 0 (ASCII or GB 1988-89) */ 104 ret = ascii_wctomb(conv,buf,wc,1); 105 if (ret != RET_ILUNI) { 106 if (ret != 1) abort(); 107 if (buf[0] < 0x80) { 108 int count = (state ? 3 : 1); 109 if (n < count) 110 return RET_TOOSMALL; 111 if (state) { 112 r[0] = '~'; 113 r[1] = '}'; 114 r += 2; 115 state = 0; 116 } 117 r[0] = buf[0]; 118 conv->ostate = state; 119 return count; 120 } 121 } 122 123 /* Code set 1 (GB 2312-1980) */ 124 ret = gb2312_wctomb(conv,buf,wc,2); 125 if (ret != RET_ILUNI) { 126 if (ret != 2) abort(); 127 if (buf[0] < 0x80 && buf[1] < 0x80) { 128 int count = (state ? 2 : 4); 129 if (n < count) 130 return RET_TOOSMALL; 131 if (!state) { 132 r[0] = '~'; 133 r[1] = '{'; 134 r += 2; 135 state = 1; 136 } 137 r[0] = buf[0]; 138 r[1] = buf[1]; 139 conv->ostate = state; 140 return count; 141 } 142 } 143 144 return RET_ILUNI; 145} 146 147static int 148hz_reset (conv_t conv, unsigned char *r, int n) 149{ 150 state_t state = conv->ostate; 151 if (state) { 152 if (n < 2) 153 return RET_TOOSMALL; 154 r[0] = '~'; 155 r[1] = '}'; 156 /* conv->ostate = 0; will be done by the caller */ 157 return 2; 158 } else 159 return 0; 160} 161