1/* Conversion UTF-8 to UCS-4. 2 Copyright (C) 2001-2002, 2006-2007 Free Software Foundation, Inc. 3 Written by Bruno Haible <bruno@clisp.org>, 2001. 4 5 This program is free software: you can redistribute it and/or modify it 6 under the terms of the GNU General Public License as published 7 by the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 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 General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 17 18#include <config.h> 19 20/* Specification. */ 21#include "unistr.h" 22 23#if HAVE_INLINE 24 25int 26u8_mbtouc_aux (ucs4_t *puc, const uint8_t *s, size_t n) 27{ 28 uint8_t c = *s; 29 30 if (c >= 0xc2) 31 { 32 if (c < 0xe0) 33 { 34 if (n >= 2) 35 { 36 if ((s[1] ^ 0x80) < 0x40) 37 { 38 *puc = ((unsigned int) (c & 0x1f) << 6) 39 | (unsigned int) (s[1] ^ 0x80); 40 return 2; 41 } 42 /* invalid multibyte character */ 43 } 44 else 45 { 46 /* incomplete multibyte character */ 47 *puc = 0xfffd; 48 return n; 49 } 50 } 51 else if (c < 0xf0) 52 { 53 if (n >= 3) 54 { 55 if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40 56 && (c >= 0xe1 || s[1] >= 0xa0) 57 && (c != 0xed || s[1] < 0xa0)) 58 { 59 *puc = ((unsigned int) (c & 0x0f) << 12) 60 | ((unsigned int) (s[1] ^ 0x80) << 6) 61 | (unsigned int) (s[2] ^ 0x80); 62 return 3; 63 } 64 /* invalid multibyte character */ 65 } 66 else 67 { 68 /* incomplete multibyte character */ 69 *puc = 0xfffd; 70 return n; 71 } 72 } 73 else if (c < 0xf8) 74 { 75 if (n >= 4) 76 { 77 if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40 78 && (s[3] ^ 0x80) < 0x40 79 && (c >= 0xf1 || s[1] >= 0x90) 80#if 1 81 && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90)) 82#endif 83 ) 84 { 85 *puc = ((unsigned int) (c & 0x07) << 18) 86 | ((unsigned int) (s[1] ^ 0x80) << 12) 87 | ((unsigned int) (s[2] ^ 0x80) << 6) 88 | (unsigned int) (s[3] ^ 0x80); 89 return 4; 90 } 91 /* invalid multibyte character */ 92 } 93 else 94 { 95 /* incomplete multibyte character */ 96 *puc = 0xfffd; 97 return n; 98 } 99 } 100#if 0 101 else if (c < 0xfc) 102 { 103 if (n >= 5) 104 { 105 if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40 106 && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40 107 && (c >= 0xf9 || s[1] >= 0x88)) 108 { 109 *puc = ((unsigned int) (c & 0x03) << 24) 110 | ((unsigned int) (s[1] ^ 0x80) << 18) 111 | ((unsigned int) (s[2] ^ 0x80) << 12) 112 | ((unsigned int) (s[3] ^ 0x80) << 6) 113 | (unsigned int) (s[4] ^ 0x80); 114 return 5; 115 } 116 /* invalid multibyte character */ 117 } 118 else 119 { 120 /* incomplete multibyte character */ 121 *puc = 0xfffd; 122 return n; 123 } 124 } 125 else if (c < 0xfe) 126 { 127 if (n >= 6) 128 { 129 if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40 130 && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40 131 && (s[5] ^ 0x80) < 0x40 132 && (c >= 0xfd || s[1] >= 0x84)) 133 { 134 *puc = ((unsigned int) (c & 0x01) << 30) 135 | ((unsigned int) (s[1] ^ 0x80) << 24) 136 | ((unsigned int) (s[2] ^ 0x80) << 18) 137 | ((unsigned int) (s[3] ^ 0x80) << 12) 138 | ((unsigned int) (s[4] ^ 0x80) << 6) 139 | (unsigned int) (s[5] ^ 0x80); 140 return 6; 141 } 142 /* invalid multibyte character */ 143 } 144 else 145 { 146 /* incomplete multibyte character */ 147 *puc = 0xfffd; 148 return n; 149 } 150 } 151#endif 152 } 153 /* invalid multibyte character */ 154 *puc = 0xfffd; 155 return 1; 156} 157 158#endif 159