1/* 2 * hfsutils - tools for reading and writing Macintosh HFS volumes 3 * Copyright (C) 1996, 1997 Robert Leslie 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 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 13 * GNU 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, write to the Free Software 17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 18 */ 19 20# include <string.h> 21# include <time.h> 22 23# include "internal.h" 24# include "data.h" 25# include "btree.h" 26 27# define MUTDIFF 2082844800L 28 29static 30unsigned long tzdiff = -1; 31 32unsigned char hfs_charorder[256] = { 33 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 34 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 35 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 36 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 37 38 0x20, 0x22, 0x23, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 39 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 40 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 41 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 42 43 0x47, 0x48, 0x58, 0x5a, 0x5e, 0x60, 0x67, 0x69, 44 0x6b, 0x6d, 0x73, 0x75, 0x77, 0x79, 0x7b, 0x7f, 45 0x8d, 0x8f, 0x91, 0x93, 0x96, 0x98, 0x9f, 0xa1, 46 0xa3, 0xa5, 0xa8, 0xaa, 0xab, 0xac, 0xad, 0xae, 47 48 0x54, 0x48, 0x58, 0x5a, 0x5e, 0x60, 0x67, 0x69, 49 0x6b, 0x6d, 0x73, 0x75, 0x77, 0x79, 0x7b, 0x7f, 50 0x8d, 0x8f, 0x91, 0x93, 0x96, 0x98, 0x9f, 0xa1, 51 0xa3, 0xa5, 0xa8, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 52 53 0x4c, 0x50, 0x5c, 0x62, 0x7d, 0x81, 0x9a, 0x55, 54 0x4a, 0x56, 0x4c, 0x4e, 0x50, 0x5c, 0x62, 0x64, 55 0x65, 0x66, 0x6f, 0x70, 0x71, 0x72, 0x7d, 0x89, 56 0x8a, 0x8b, 0x81, 0x83, 0x9c, 0x9d, 0x9e, 0x9a, 57 58 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0x95, 59 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0x52, 0x85, 60 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 61 0xc9, 0xca, 0xcb, 0x57, 0x8c, 0xcc, 0x52, 0x85, 62 63 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0x26, 64 0x27, 0xd4, 0x20, 0x4a, 0x4e, 0x83, 0x87, 0x87, 65 0xd5, 0xd6, 0x24, 0x25, 0x2d, 0x2e, 0xd7, 0xd8, 66 0xa7, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 67 68 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 69 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 70 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 71 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff 72}; 73 74/* 75 * NAME: data->getb() 76 * DESCRIPTION: marshal 1 byte into local host format 77 */ 78char d_getb(unsigned char *ptr) 79{ 80 return (char) ptr[0]; 81} 82 83/* 84 * NAME: data->getw() 85 * DESCRIPTION: marshal 2 bytes into local host format 86 */ 87short d_getw(unsigned char *ptr) 88{ 89 return (short) 90 ((ptr[0] << 8) | 91 (ptr[1] << 0)); 92} 93 94/* 95 * NAME: data->getl() 96 * DESCRIPTION: marshal 4 bytes into local host format 97 */ 98long d_getl(unsigned char *ptr) 99{ 100 return (long) 101 ((ptr[0] << 24) | 102 (ptr[1] << 16) | 103 (ptr[2] << 8) | 104 (ptr[3] << 0)); 105} 106 107/* 108 * NAME: data->putb() 109 * DESCRIPTION: marshal 1 byte out to Macintosh (big-endian) format 110 */ 111void d_putb(unsigned char *ptr, char data) 112{ 113 ptr[0] = (unsigned char) data; 114} 115 116/* 117 * NAME: data->putw() 118 * DESCRIPTION: marshal 2 bytes out to Macintosh (big-endian) format 119 */ 120void d_putw(unsigned char *ptr, short data) 121{ 122 ptr[0] = ((unsigned short) data & 0xff00) >> 8; 123 ptr[1] = ((unsigned short) data & 0x00ff) >> 0; 124} 125 126/* 127 * NAME: data->putl() 128 * DESCRIPTION: marshal 4 bytes out to Macintosh (big-endian) format 129 */ 130void d_putl(unsigned char *ptr, long data) 131{ 132 ptr[0] = ((unsigned long) data & 0xff000000) >> 24; 133 ptr[1] = ((unsigned long) data & 0x00ff0000) >> 16; 134 ptr[2] = ((unsigned long) data & 0x0000ff00) >> 8; 135 ptr[3] = ((unsigned long) data & 0x000000ff) >> 0; 136} 137 138/* 139 * NAME: data->fetchb() 140 * DESCRIPTION: incrementally retrieve a byte of data 141 */ 142void d_fetchb(unsigned char **ptr, char *dest) 143{ 144 *dest = d_getb(*ptr); 145 *ptr += 1; 146} 147 148/* 149 * NAME: data->fetchw() 150 * DESCRIPTION: incrementally retrieve a word of data 151 */ 152void d_fetchw(unsigned char **ptr, short *dest) 153{ 154 *dest = d_getw(*ptr); 155 *ptr += 2; 156} 157 158/* 159 * NAME: data->fetchl() 160 * DESCRIPTION: incrementally retrieve a long word of data 161 */ 162void d_fetchl(unsigned char **ptr, long *dest) 163{ 164 *dest = d_getl(*ptr); 165 *ptr += 4; 166} 167 168/* 169 * NAME: data->fetchs() 170 * DESCRIPTION: incrementally retrieve a string 171 */ 172void d_fetchs(unsigned char **ptr, char *dest, int size) 173{ 174 int len; 175 char blen; 176 177 d_fetchb(ptr, &blen); 178 len = blen; 179 180 if (len > 0 && len < size) 181 memcpy(dest, *ptr, len); 182 else 183 len = 0; 184 185 dest[len] = 0; 186 187 *ptr += size - 1; 188} 189 190/* 191 * NAME: data->storeb() 192 * DESCRIPTION: incrementally store a byte of data 193 */ 194void d_storeb(unsigned char **ptr, char data) 195{ 196 d_putb(*ptr, data); 197 *ptr += 1; 198} 199 200/* 201 * NAME: data->storew() 202 * DESCRIPTION: incrementally store a word of data 203 */ 204void d_storew(unsigned char **ptr, short data) 205{ 206 d_putw(*ptr, data); 207 *ptr += 2; 208} 209 210/* 211 * NAME: data->storel() 212 * DESCRIPTION: incrementally store a long word of data 213 */ 214void d_storel(unsigned char **ptr, long data) 215{ 216 d_putl(*ptr, data); 217 *ptr += 4; 218} 219 220/* 221 * NAME: data->stores() 222 * DESCRIPTION: incrementally store a string 223 */ 224void d_stores(unsigned char **ptr, char *src, int size) 225{ 226 int len; 227 228 len = strlen(src); 229 if (len > --size) 230 len = 0; 231 232 d_storeb(ptr, (unsigned char) len); 233 234 memcpy(*ptr, src, len); 235 memset(*ptr + len, 0, size - len); 236 237 *ptr += size; 238} 239 240/* 241 * NAME: calctzdiff() 242 * DESCRIPTION: calculate the timezone difference between local time and UTC 243 */ 244static 245void calctzdiff(void) 246{ 247 time_t t; 248 int isdst; 249 struct tm tm, *tmp; 250 251 time(&t); 252 isdst = localtime(&t)->tm_isdst; 253 254 tmp = gmtime(&t); 255 if (tmp) 256 { 257 tm = *tmp; 258 tm.tm_isdst = isdst; 259 260 tzdiff = t - mktime(&tm); 261 } 262 else 263 tzdiff = 0; 264} 265 266/* 267 * NAME: data->tomtime() 268 * DESCRIPTION: convert UNIX time to Macintosh time 269 */ 270unsigned long d_tomtime(unsigned long secs) 271{ 272 time_t utime = secs; 273 274 if (tzdiff == -1) 275 calctzdiff(); 276 277 return utime + tzdiff + MUTDIFF; 278} 279 280/* 281 * NAME: data->toutime() 282 * DESCRIPTION: convert Macintosh time to UNIX time 283 */ 284unsigned long d_toutime(unsigned long secs) 285{ 286 time_t utime = secs; 287 288 if (tzdiff == -1) 289 calctzdiff(); 290 291 return utime - MUTDIFF - tzdiff; 292} 293 294/* 295 * NAME: data->relstring() 296 * DESCRIPTION: compare two strings as per MacOS for HFS 297 */ 298int d_relstring(char *str1, char *str2) 299{ 300 int diff; 301 302 while (*str1 && *str2) 303 { 304 diff = hfs_charorder[(unsigned char) *str1] - 305 hfs_charorder[(unsigned char) *str2]; 306 307 if (diff) 308 return diff; 309 310 ++str1, ++str2; 311 } 312 313 if (! *str1 && *str2) 314 return -1; 315 else if (*str1 && ! *str2) 316 return 1; 317 318 return 0; 319} 320