| 1 | /*␊ |
| 2 | * Copyright (c) 2000-2003 Apple Computer, Inc. All rights reserved.␊ |
| 3 | *␊ |
| 4 | * @APPLE_LICENSE_HEADER_START@␊ |
| 5 | * ␊ |
| 6 | * The contents of this file constitute Original Code as defined in and␊ |
| 7 | * are subject to the Apple Public Source License Version 2.0 (the␊ |
| 8 | * "License"). You may not use this file except in compliance with the␊ |
| 9 | * License. Please obtain a copy of the License at␊ |
| 10 | * http://www.apple.com/publicsource and read it before using this file.␊ |
| 11 | * ␊ |
| 12 | * This Original Code and all software distributed under the License are␊ |
| 13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
| 14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
| 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the␊ |
| 17 | * License for the specific language governing rights and limitations␊ |
| 18 | * under the License.␊ |
| 19 | * ␊ |
| 20 | * @APPLE_LICENSE_HEADER_END@␊ |
| 21 | */␊ |
| 22 | /*␊ |
| 23 | * HFSCompare.c - Functions for working with and comparing HFS nams.␊ |
| 24 | *␊ |
| 25 | * Copyright (c) 1999-2000 Apple Computer, Inc.␊ |
| 26 | *␊ |
| 27 | * DRI: Josh de Cesare␊ |
| 28 | */␊ |
| 29 | ␊ |
| 30 | #include <sl.h>␊ |
| 31 | #include "hfs_CaseTables.h"␊ |
| 32 | ␊ |
| 33 | #if ! UNCOMPRESSED␊ |
| 34 | ␊ |
| 35 | static unsigned short *␊ |
| 36 | UncompressStructure(struct compressed_block *bp, int count, int size)␊ |
| 37 | {␊ |
| 38 | unsigned short *out = malloc(size);␊ |
| 39 | unsigned short *op = out;␊ |
| 40 | unsigned short data;␊ |
| 41 | int i, j;␊ |
| 42 | ␊ |
| 43 | for (i=0; i<count; i++, bp++) {␊ |
| 44 | // If this happens (it shouldn't) please fix size and/or double check that count really is␊ |
| 45 | // the number of elements in the array.␊ |
| 46 | // This was a very hard bug to find, so please leave this code here.␊ |
| 47 | if(out + size <= op + bp->count)␊ |
| 48 | {␊ |
| 49 | stop("HFS+ Unicode tables are malformed\n");␊ |
| 50 | }␊ |
| 51 | data = bp->data;␊ |
| 52 | for (j=0; j<bp->count; j++) {␊ |
| 53 | *op++ = data;␊ |
| 54 | if (bp->type == kTypeAscending) data++;␊ |
| 55 | else if (bp->type == kTypeAscending256) data += 256;␊ |
| 56 | }␊ |
| 57 | }␊ |
| 58 | return out;␊ |
| 59 | }␊ |
| 60 | ␊ |
| 61 | static void␊ |
| 62 | InitCompareTables(void)␊ |
| 63 | {␊ |
| 64 | if (gCompareTable == 0) {␊ |
| 65 | gCompareTable = UncompressStructure(gCompareTableCompressed,␊ |
| 66 | kCompareTableNBlocks, kCompareTableDataSize);␊ |
| 67 | gLowerCaseTable = UncompressStructure(gLowerCaseTableCompressed,␊ |
| 68 | kLowerCaseTableNBlocks, kLowerCaseTableDataSize);␊ |
| 69 | }␊ |
| 70 | }␊ |
| 71 | ␊ |
| 72 | #endif /* ! UNCOMPRESSED */␊ |
| 73 | ␊ |
| 74 | //_______________________________________________________________________␊ |
| 75 | //␊ |
| 76 | //␉Routine:␉FastRelString␊ |
| 77 | //␊ |
| 78 | //␉Output:␉␉returns -1 if str1 < str2␊ |
| 79 | //␉␉␉␉returns 1 if str1 > str2␊ |
| 80 | //␉␉␉␉return␉ 0 if equal␊ |
| 81 | //␊ |
| 82 | //_______________________________________________________________________␊ |
| 83 | ␊ |
| 84 | int32_t␉FastRelString(u_int8_t * str1, u_int8_t * str2)␊ |
| 85 | {␊ |
| 86 | ␉int32_t bestGuess;␊ |
| 87 | ␉u_int8_t length, length2;␊ |
| 88 | ␊ |
| 89 | #if ! UNCOMPRESED␊ |
| 90 | InitCompareTables();␊ |
| 91 | #endif␊ |
| 92 | ␊ |
| 93 | ␉length = *(str1++);␊ |
| 94 | ␉length2 = *(str2++);␊ |
| 95 | ␊ |
| 96 | ␉if (length == length2)␊ |
| 97 | ␉␉bestGuess = 0;␊ |
| 98 | ␉else if (length < length2)␊ |
| 99 | ␉␉bestGuess = -1;␊ |
| 100 | ␉else␊ |
| 101 | ␉{␊ |
| 102 | ␉␉bestGuess = 1;␊ |
| 103 | ␉␉length = length2;␊ |
| 104 | ␉}␊ |
| 105 | ␊ |
| 106 | ␉while (length--)␊ |
| 107 | ␉{␊ |
| 108 | ␉␉u_int32_t aChar, bChar;␊ |
| 109 | ␊ |
| 110 | ␉␉aChar = *(str1++);␊ |
| 111 | ␉␉bChar = *(str2++);␊ |
| 112 | ␉␉␊ |
| 113 | ␉␉if (aChar != bChar)␉/* If they don't match exacly, do case conversion */␊ |
| 114 | ␉␉{␊ |
| 115 | ␉␉␉u_int16_t aSortWord, bSortWord;␊ |
| 116 | ␊ |
| 117 | ␉␉␉aSortWord = gCompareTable[aChar];␊ |
| 118 | ␉␉␉bSortWord = gCompareTable[bChar];␊ |
| 119 | ␊ |
| 120 | ␉␉␉if (aSortWord > bSortWord)␊ |
| 121 | ␉␉␉␉return 1;␊ |
| 122 | ␊ |
| 123 | ␉␉␉if (aSortWord < bSortWord)␊ |
| 124 | ␉␉␉␉return -1;␊ |
| 125 | ␉␉}␊ |
| 126 | ␊ |
| 127 | ␉␉/*␊ |
| 128 | ␉␉ * If characters match exactly, then go on to next character␊ |
| 129 | ␉␉ * immediately without doing any extra work.␊ |
| 130 | ␉␉ */␊ |
| 131 | ␉}␊ |
| 132 | ␉␊ |
| 133 | ␉/* If you got to here, then return bestGuess */␊ |
| 134 | ␉return bestGuess;␊ |
| 135 | }␉␊ |
| 136 | ␊ |
| 137 | ␊ |
| 138 | //␊ |
| 139 | //␉FastUnicodeCompare - Compare two Unicode strings; produce a relative ordering␊ |
| 140 | //␊ |
| 141 | //␉ IF␉␉␉␉RESULT␊ |
| 142 | //␉--------------------------␊ |
| 143 | //␉str1 < str2␉␉=>␉-1␊ |
| 144 | //␉str1 = str2␉␉=>␉ 0␊ |
| 145 | //␉str1 > str2␉␉=>␉+1␊ |
| 146 | //␊ |
| 147 | //␉The lower case table starts with 256 entries (one for each of the upper bytes␊ |
| 148 | //␉of the original Unicode char). If that entry is zero, then all characters with␊ |
| 149 | //␉that upper byte are already case folded. If the entry is non-zero, then it is␊ |
| 150 | //␉the _index_ (not byte offset) of the start of the sub-table for the characters␊ |
| 151 | //␉with that upper byte. All ignorable characters are folded to the value zero.␊ |
| 152 | //␊ |
| 153 | //␉In pseudocode:␊ |
| 154 | //␊ |
| 155 | //␉␉Let c = source Unicode character␊ |
| 156 | //␉␉Let table[] = lower case table␊ |
| 157 | //␊ |
| 158 | //␉␉lower = table[highbyte(c)]␊ |
| 159 | //␉␉if (lower == 0)␊ |
| 160 | //␉␉␉lower = c␊ |
| 161 | //␉␉else␊ |
| 162 | //␉␉␉lower = table[lower+lowbyte(c)]␊ |
| 163 | //␊ |
| 164 | //␉␉if (lower == 0)␊ |
| 165 | //␉␉␉ignore this character␊ |
| 166 | //␊ |
| 167 | //␉To handle ignorable characters, we now need a loop to find the next valid character.␊ |
| 168 | //␉Also, we can't pre-compute the number of characters to compare; the string length might␊ |
| 169 | //␉be larger than the number of non-ignorable characters. Further, we must be able to handle␊ |
| 170 | //␉ignorable characters at any point in the string, including as the first or last characters.␊ |
| 171 | //␉We use a zero value as a sentinel to detect both end-of-string and ignorable characters.␊ |
| 172 | //␉Since the File Manager doesn't prevent the NUL character (value zero) as part of a filename,␊ |
| 173 | //␉the case mapping table is assumed to map u+0000 to some non-zero value (like 0xFFFF, which is␊ |
| 174 | //␉an invalid Unicode character).␊ |
| 175 | //␊ |
| 176 | //␉Pseudocode:␊ |
| 177 | //␊ |
| 178 | //␉␉while (1) {␊ |
| 179 | //␉␉␉c1 = GetNextValidChar(str1)␉␉␉//␉returns zero if at end of string␊ |
| 180 | //␉␉␉c2 = GetNextValidChar(str2)␊ |
| 181 | //␊ |
| 182 | //␉␉␉if (c1 != c2) break␉␉␉␉␉//␉found a difference␊ |
| 183 | //␊ |
| 184 | //␉␉␉if (c1 == 0)␉␉␉␉␉␉//␉reached end of string on both strings at once?␊ |
| 185 | //␉␉␉␉return 0;␉␉␉␉␉␉//␉yes, so strings are equal␊ |
| 186 | //␉␉}␊ |
| 187 | //␊ |
| 188 | //␉␉// When we get here, c1 != c2. So, we just need to determine which one is less.␊ |
| 189 | //␉␉if (c1 < c2)␊ |
| 190 | //␉␉␉return -1;␊ |
| 191 | //␉␉else␊ |
| 192 | //␉␉␉return 1;␊ |
| 193 | //␊ |
| 194 | ␊ |
| 195 | int32_t FastUnicodeCompare( u_int16_t * str1, register u_int32_t length1,␊ |
| 196 | u_int16_t * str2, register u_int32_t length2, int byte_order )␊ |
| 197 | {␊ |
| 198 | ␉register u_int16_t c1,c2;␊ |
| 199 | ␉register u_int16_t temp;␊ |
| 200 | ␊ |
| 201 | #if ! UNCOMPRESSED␊ |
| 202 | InitCompareTables();␊ |
| 203 | #endif␊ |
| 204 | ␊ |
| 205 | ␉while (1) {␊ |
| 206 | ␉␉/* Set default values for c1, c2 in case there are no more valid chars */␊ |
| 207 | ␉␉c1 = 0;␊ |
| 208 | ␉␉c2 = 0;␊ |
| 209 | ␊ |
| 210 | ␉␉/* Find next non-ignorable char from str1, or zero if no more */␊ |
| 211 | ␉␉while (length1 && c1 == 0) {␊ |
| 212 | ␉␉␉if (byte_order == OSBigEndian)␊ |
| 213 | ␉␉␉␉c1 = SWAP_BE16(*(str1++));␊ |
| 214 | ␉␉␉else␊ |
| 215 | ␉␉␉␉c1 = SWAP_LE16(*(str1++));␊ |
| 216 | ␉␉␉--length1;␊ |
| 217 | ␉␉␉if ((temp = gLowerCaseTable[c1>>8]) != 0)␉␉// is there a subtable for this upper byte?␊ |
| 218 | ␉␉␉␉c1 = gLowerCaseTable[temp + (c1 & 0x00FF)];␉// yes, so fold the char␊ |
| 219 | ␉␉}␊ |
| 220 | ␊ |
| 221 | ␉␉/* Find next non-ignorable char from str2, or zero if no more */␊ |
| 222 | ␉␉while (length2 && c2 == 0) {␊ |
| 223 | ␉␉␉if (byte_order == OSBigEndian)␊ |
| 224 | ␉␉␉␉c2 = SWAP_BE16(*(str2++));␊ |
| 225 | ␉␉␉else␊ |
| 226 | ␉␉␉␉c2 = SWAP_LE16(*(str2++));␊ |
| 227 | ␉␉␉--length2;␊ |
| 228 | ␉␉␉if ((temp = gLowerCaseTable[c2>>8]) != 0)␉␉// is there a subtable for this upper byte?␊ |
| 229 | ␉␉␉␉c2 = gLowerCaseTable[temp + (c2 & 0x00FF)];␉// yes, so fold the char␊ |
| 230 | ␉␉}␊ |
| 231 | ␊ |
| 232 | ␉␉if (c1 != c2)␉/* found a difference, so stop looping */␊ |
| 233 | ␉␉␉break;␊ |
| 234 | ␉␉␊ |
| 235 | ␉␉if (c1 == 0)␉␉/* did we reach the end of both strings at the same time? */␊ |
| 236 | ␉␉␉return 0;␉/* yes, so strings are equal */␊ |
| 237 | ␉}␊ |
| 238 | ␉␊ |
| 239 | ␉if (c1 < c2)␊ |
| 240 | ␉␉return -1;␊ |
| 241 | ␉else␊ |
| 242 | ␉␉return 1;␊ |
| 243 | }␊ |
| 244 | ␊ |
| 245 | ␊ |
| 246 | //␊ |
| 247 | // BinaryUnicodeCompare - Compare two Unicode strings; produce a relative ordering␊ |
| 248 | // Compared using a 16-bit binary comparison (no case folding)␊ |
| 249 | //␊ |
| 250 | int32_t BinaryUnicodeCompare (u_int16_t * str1, u_int32_t length1,␊ |
| 251 | u_int16_t * str2, u_int32_t length2)␊ |
| 252 | {␊ |
| 253 | register u_int16_t c1, c2;␊ |
| 254 | int32_t bestGuess;␊ |
| 255 | u_int32_t length;␊ |
| 256 | ␊ |
| 257 | bestGuess = 0;␊ |
| 258 | ␊ |
| 259 | if (length1 < length2) {␊ |
| 260 | length = length1;␊ |
| 261 | --bestGuess;␊ |
| 262 | } else if (length1 > length2) {␊ |
| 263 | length = length2;␊ |
| 264 | ++bestGuess;␊ |
| 265 | } else {␊ |
| 266 | length = length1;␊ |
| 267 | }␊ |
| 268 | ␊ |
| 269 | while (length--) {␊ |
| 270 | c1 = *(str1++);␊ |
| 271 | c2 = *(str2++);␊ |
| 272 | ␊ |
| 273 | if (c1 > c2)␊ |
| 274 | return (1);␊ |
| 275 | if (c1 < c2)␊ |
| 276 | return (-1);␊ |
| 277 | }␊ |
| 278 | ␊ |
| 279 | return (bestGuess);␊ |
| 280 | }␊ |
| 281 | ␊ |
| 282 | ␊ |
| 283 | /*␊ |
| 284 | * UTF-8 (UCS Transformation Format)␊ |
| 285 | *␊ |
| 286 | * The following subset of UTF-8 is used to encode UCS-2 filenames. It␊ |
| 287 | * requires a maximum of three 3 bytes per UCS-2 character. Only the␊ |
| 288 | * shortest encoding required to represent the significant UCS-2 bits␊ |
| 289 | * is legal.␊ |
| 290 | * ␊ |
| 291 | * UTF-8 Multibyte Codes␊ |
| 292 | *␊ |
| 293 | * Bytes Bits UCS-2 Min UCS-2 Max UTF-8 Byte Sequence (binary)␊ |
| 294 | * -------------------------------------------------------------------␊ |
| 295 | * 1 7 0x0000 0x007F 0xxxxxxx␊ |
| 296 | * 2 11 0x0080 0x07FF 110xxxxx 10xxxxxx␊ |
| 297 | * 3 16 0x0800 0xFFFF 1110xxxx 10xxxxxx 10xxxxxx␊ |
| 298 | * -------------------------------------------------------------------␊ |
| 299 | */␊ |
| 300 | ␊ |
| 301 | ␊ |
| 302 | /*␊ |
| 303 | * utf_encodestr - Encodes the UCS-2 (Unicode) string at ucsp into a␊ |
| 304 | * null terminated UTF-8 string at utf8p.␊ |
| 305 | *␊ |
| 306 | * ucslen is the number of UCS-2 input characters (not bytes)␊ |
| 307 | * bufsize is the size of the output buffer in bytes␊ |
| 308 | */␊ |
| 309 | void␊ |
| 310 | utf_encodestr( const u_int16_t * ucsp, int ucslen,␊ |
| 311 | u_int8_t * utf8p, u_int32_t bufsize, int byte_order )␊ |
| 312 | {␊ |
| 313 | ␉u_int8_t *bufend;␊ |
| 314 | ␉u_int16_t ucs_ch;␊ |
| 315 | ␊ |
| 316 | ␉bufend = utf8p + bufsize;␊ |
| 317 | ␊ |
| 318 | ␉while (ucslen-- > 0) {␊ |
| 319 | if (byte_order == OSBigEndian)␊ |
| 320 | ␉␉ ucs_ch = SWAP_BE16(*ucsp++);␊ |
| 321 | else␊ |
| 322 | ucs_ch = SWAP_LE16(*ucsp++);␊ |
| 323 | ␊ |
| 324 | ␉␉if (ucs_ch < 0x0080) {␊ |
| 325 | ␉␉␉if (utf8p >= bufend)␊ |
| 326 | ␉␉␉␉break;␊ |
| 327 | ␉␉␉if (ucs_ch == '\0')␊ |
| 328 | ␉␉␉␉continue;␉/* skip over embedded NULLs */␊ |
| 329 | ␉␉␉*utf8p++ = ucs_ch;␊ |
| 330 | ␊ |
| 331 | ␉␉} else if (ucs_ch < 0x800) {␊ |
| 332 | ␉␉␉if ((utf8p + 1) >= bufend)␊ |
| 333 | ␉␉␉␉break;␊ |
| 334 | ␉␉␉*utf8p++ = (ucs_ch >> 6) | 0xc0;␊ |
| 335 | ␉␉␉*utf8p++ = (ucs_ch & 0x3f) | 0x80;␊ |
| 336 | ␊ |
| 337 | ␉␉} else {␊ |
| 338 | ␉␉␉if ((utf8p + 2) >= bufend)␊ |
| 339 | ␉␉␉␉break;␊ |
| 340 | ␉␉␉*utf8p++ = (ucs_ch >> 12) | 0xe0;␊ |
| 341 | ␉␉␉*utf8p++ = ((ucs_ch >> 6) & 0x3f) | 0x80;␊ |
| 342 | ␉␉␉*utf8p++ = ((ucs_ch) & 0x3f) | 0x80;␊ |
| 343 | ␉␉}␊ |
| 344 | ␉}␊ |
| 345 | ␊ |
| 346 | ␉*utf8p = '\0';␊ |
| 347 | }␊ |
| 348 | ␊ |
| 349 | ␊ |
| 350 | /*␊ |
| 351 | * utf_decodestr - Decodes the null terminated UTF-8 string at␊ |
| 352 | * utf8p into a UCS-2 (Unicode) string at ucsp.␊ |
| 353 | *␊ |
| 354 | * ucslen is the number of UCS-2 output characters (not bytes)␊ |
| 355 | * bufsize is the size of the output buffer in bytes␊ |
| 356 | */␊ |
| 357 | void utf_decodestr(const u_int8_t * utf8p, u_int16_t * ucsp, u_int16_t * ucslen, u_int32_t bufsize, int byte_order)␊ |
| 358 | {␊ |
| 359 | ␉u_int16_t *bufstart;␊ |
| 360 | ␉u_int16_t *bufend;␊ |
| 361 | ␉u_int16_t ucs_ch;␊ |
| 362 | ␉u_int8_t byte;␊ |
| 363 | ␊ |
| 364 | ␉bufstart = ucsp;␊ |
| 365 | ␉bufend = (u_int16_t *)((u_int8_t *)ucsp + bufsize);␊ |
| 366 | ␊ |
| 367 | ␉while ((byte = *utf8p++) != '\0') {␊ |
| 368 | ␉␉if (ucsp >= bufend)␊ |
| 369 | ␉␉␉break;␊ |
| 370 | ␊ |
| 371 | ␉␉/* check for ascii */␊ |
| 372 | ␉␉if (byte < 0x80) {␊ |
| 373 | ␉␉␉ucs_ch = byte;␊ |
| 374 | ␉␉␉␊ |
| 375 | if (byte_order == OSBigEndian)␊ |
| 376 | ␉␉ *ucsp++ = SWAP_BE16(ucs_ch);␊ |
| 377 | else␊ |
| 378 | *ucsp++ = SWAP_LE16(ucs_ch);␊ |
| 379 | ␉␉␉␊ |
| 380 | ␉␉␉continue;␊ |
| 381 | ␉␉}␊ |
| 382 | ␊ |
| 383 | ␉␉switch (byte & 0xf0) {␊ |
| 384 | ␉␉/* 2 byte sequence*/␊ |
| 385 | ␉␉case 0xc0:␊ |
| 386 | ␉␉case 0xd0:␊ |
| 387 | ␉␉␉/* extract bits 6 - 10 from first byte */␊ |
| 388 | ␉␉␉ucs_ch = (byte & 0x1F) << 6; ␊ |
| 389 | ␉␉␉break;␊ |
| 390 | ␉␉/* 3 byte sequence*/␊ |
| 391 | ␉␉case 0xe0:␊ |
| 392 | ␉␉␉/* extract bits 12 - 15 from first byte */␊ |
| 393 | ␉␉␉ucs_ch = (byte & 0x0F) << 6;␊ |
| 394 | ␊ |
| 395 | ␉␉␉/* extract bits 6 - 11 from second byte */␊ |
| 396 | ␉␉␉if (((byte = *utf8p++) & 0xc0) != 0x80)␊ |
| 397 | ␉␉␉␉goto stop;␊ |
| 398 | ␊ |
| 399 | ␉␉␉ucs_ch += (byte & 0x3F);␊ |
| 400 | ␉␉␉ucs_ch <<= 6;␊ |
| 401 | ␉␉␉break;␊ |
| 402 | ␉␉default:␊ |
| 403 | ␉␉␉goto stop;␊ |
| 404 | ␉␉}␊ |
| 405 | ␊ |
| 406 | ␉␉/* extract bits 0 - 5 from final byte */␊ |
| 407 | ␉␉if (((byte = *utf8p++) & 0xc0) != 0x80)␊ |
| 408 | ␉␉␉goto stop;␊ |
| 409 | ␉␉ucs_ch += (byte & 0x3F); ␊ |
| 410 | ␊ |
| 411 | if (byte_order == OSBigEndian)␊ |
| 412 | *ucsp++ = SWAP_BE16(ucs_ch);␊ |
| 413 | else␊ |
| 414 | *ucsp++ = SWAP_LE16(ucs_ch);␊ |
| 415 | ␉}␊ |
| 416 | stop:␊ |
| 417 | if (byte_order == OSBigEndian)␊ |
| 418 | *ucslen = SWAP_BE16(ucsp - bufstart);␊ |
| 419 | else␊ |
| 420 | *ucslen = SWAP_LE16(ucsp - bufstart);␊ |
| 421 | }␊ |
| 422 | |
