bsd/hfs/hfs_encodings.c

   1 /*
   2  * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25
  26 #include <sys/param.h>
  27 #include <sys/systm.h>
  28 #include <sys/kernel.h>
  29 #include <sys/lock.h>
  30 #include <sys/malloc.h>
  31 #include <sys/queue.h>
  32 #include <sys/utfconv.h>
  33
  34 #include "hfs.h"
  35
  36
  37 /* hfs encoding converter list */
  38 SLIST_HEAD(encodinglst, hfs_encoding) hfs_encoding_list = {0};
  39 decl_simple_lock_data(,hfs_encoding_list_slock);
  40
  41
  42 /* hfs encoding converter entry */
  43 struct  hfs_encoding {
  44         SLIST_ENTRY(hfs_encoding)  link;
  45         int                     refcount;
  46         int                     kmod_id;
  47         UInt32                  encoding;
  48         hfs_to_unicode_func_t   get_unicode_func;
  49         unicode_to_hfs_func_t   get_hfsname_func;
  50 };
  51
  52 /* XXX We should use an "official" interface! */
  53 extern kern_return_t kmod_destroy(host_priv_t host_priv, kmod_t id);
  54 extern struct host realhost;
  55
  56 #define MAX_HFS_UNICODE_CHARS   (15*5)
  57
  58 int mac_roman_to_unicode(Str31 hfs_str, UniChar *uni_str, UInt32 maxCharLen, UInt32 *usedCharLen);
  59
  60 static int unicode_to_mac_roman(UniChar *uni_str, UInt32 unicodeChars, Str31 hfs_str);
  61
  62
  63 void
  64 hfs_converterinit(void)
  65 {
  66         SLIST_INIT(&hfs_encoding_list);
  67         simple_lock_init(&hfs_encoding_list_slock);
  68
  69         /*
  70          * add resident MacRoman converter and take a reference
  71          * since its always "loaded".
  72          */
  73         hfs_addconverter(0, kTextEncodingMacRoman, mac_roman_to_unicode, unicode_to_mac_roman);
  74         SLIST_FIRST(&hfs_encoding_list)->refcount++;
  75 }
  76
  77
  78 /*
  79  * hfs_addconverter - add an HFS encoding converter
  80  *
  81  * This is called exclusivly by kernel loadable modules
  82  * (like HFS_Japanese.kmod) to register hfs encoding
  83  * conversion routines.
  84  *
  85  */
  86 int
  87 hfs_addconverter(int id, UInt32 encoding, hfs_to_unicode_func_t get_unicode, unicode_to_hfs_func_t get_hfsname)
  88 {
  89         struct hfs_encoding *encp;
  90
  91         MALLOC(encp, struct hfs_encoding *, sizeof(struct hfs_encoding), M_TEMP, M_WAITOK);
  92
  93         simple_lock(&hfs_encoding_list_slock);
  94
  95         encp->link.sle_next = NULL;
  96         encp->refcount = 0;
  97         encp->encoding = encoding;
  98         encp->get_unicode_func = get_unicode;
  99         encp->get_hfsname_func = get_hfsname;
 100         encp->kmod_id = id;
 101         SLIST_INSERT_HEAD(&hfs_encoding_list, encp, link);
 102
 103         simple_unlock(&hfs_encoding_list_slock);
 104         return (0);
 105 }
 106
 107
 108 /*
 109  * hfs_remconverter - remove an HFS encoding converter
 110  *
 111  * Can be called by a kernel loadable module's finalize
 112  * routine to remove an encoding converter so that the
 113  * module (i.e. the code) can be unloaded.
 114  *
 115  * However, in the normal case, the removing and unloading
 116  * of these converters is done in hfs_relconverter.
 117  * The call is initiated from within the kernel during the unmounting of an hfs voulume.
 118  */
 119 int
 120 hfs_remconverter(int id, UInt32 encoding)
 121 {
 122         struct hfs_encoding *encp;
 123         int busy = 0;
 124
 125         simple_lock(&hfs_encoding_list_slock);
 126         SLIST_FOREACH(encp, &hfs_encoding_list, link) {
 127                 if (encp->encoding == encoding && encp->kmod_id == id) {
 128                         encp->refcount--;
 129
 130                         /* if converter is no longer in use, release it */
 131                         if (encp->refcount <= 0 && encp->kmod_id != 0) {
 132                                 SLIST_REMOVE(&hfs_encoding_list, encp, hfs_encoding, link);
 133                                 FREE(encp, M_TEMP);
 134                         } else {
 135                                 busy = 1;
 136                         }
 137                         break;
 138                 }
 139         }
 140         simple_unlock(&hfs_encoding_list_slock);
 141
 142         return (busy);
 143 }
 144
 145
 146 /*
 147  * hfs_getconverter - get HFS encoding converters
 148  *
 149  * Normally called during the mounting of an hfs voulume.
 150  */
 151 int
 152 hfs_getconverter(UInt32 encoding, hfs_to_unicode_func_t *get_unicode, unicode_to_hfs_func_t *get_hfsname)
 153 {
 154         struct hfs_encoding *encp;
 155         int found = 0;
 156
 157         simple_lock(&hfs_encoding_list_slock);
 158         SLIST_FOREACH(encp, &hfs_encoding_list, link) {
 159                 if (encp->encoding == encoding) {
 160                         found = 1;
 161                         *get_unicode = encp->get_unicode_func;
 162                         *get_hfsname = encp->get_hfsname_func;
 163                         ++encp->refcount;
 164                         break;
 165                 }
 166         }
 167         simple_unlock(&hfs_encoding_list_slock);
 168
 169         if (!found) {
 170                 *get_unicode = NULL;
 171                 *get_hfsname = NULL;
 172                 return (EINVAL);
 173         }
 174
 175         return (0);
 176 }
 177
 178
 179 /*
 180  * hfs_relconverter - release interest in an HFS encoding converter
 181  *
 182  * Normally called during the unmounting of an hfs voulume.
 183  */
 184 int
 185 hfs_relconverter(UInt32 encoding)
 186 {
 187         struct hfs_encoding *encp;
 188         int found = 0;
 189
 190         simple_lock(&hfs_encoding_list_slock);
 191         SLIST_FOREACH(encp, &hfs_encoding_list, link) {
 192                 if (encp->encoding == encoding) {
 193                         found = 1;
 194                         encp->refcount--;
 195
 196                         /* if converter is no longer in use, release it */
 197                         if (encp->refcount <= 0 && encp->kmod_id != 0) {
 198                                 int id = encp->kmod_id;
 199
 200                                 SLIST_REMOVE(&hfs_encoding_list, encp, hfs_encoding, link);
 201                                 FREE(encp, M_TEMP);
 202                                 encp = NULL;
 203
 204                                 simple_unlock(&hfs_encoding_list_slock);
 205                                 kmod_destroy(host_priv_self(), id);
 206                                 simple_lock(&hfs_encoding_list_slock);
 207                         }
 208                         break;
 209                 }
 210         }
 211         simple_unlock(&hfs_encoding_list_slock);
 212
 213         return (found ? 0 : EINVAL);
 214 }
 215
 216
 217 /*
 218  * Convert HFS encoded string into UTF-8
 219  *
 220  * Unicode output is fully decomposed
 221  * '/' chars are converted to ':'
 222  */
 223 int
 224 hfs_to_utf8(ExtendedVCB *vcb, Str31 hfs_str, ByteCount maxDstLen, ByteCount *actualDstLen, unsigned char* dstStr)
 225 {
 226         int error;
 227         UniChar uniStr[MAX_HFS_UNICODE_CHARS];
 228         ItemCount uniCount;
 229         size_t utf8len;
 230         hfs_to_unicode_func_t hfs_get_unicode = VCBTOHFS(vcb)->hfs_get_unicode;
 231
 232         error = hfs_get_unicode(hfs_str, uniStr, MAX_HFS_UNICODE_CHARS, &uniCount);
 233
 234         if (uniCount == 0)
 235                 error = EINVAL;
 236
 237         if (error == 0) {
 238                 error = utf8_encodestr(uniStr, uniCount * sizeof(UniChar), dstStr, &utf8len, maxDstLen , ':', 0);
 239                 if (error == ENAMETOOLONG)
 240                         *actualDstLen = utf8_encodelen(uniStr, uniCount * sizeof(UniChar), ':', 0);
 241                 else
 242                         *actualDstLen = utf8len;
 243         }
 244
 245         return error;
 246 }
 247
 248
 249 /*
 250  * When an HFS name cannot be encoded with the current
 251  * volume encoding then MacRoman is used as a fallback.
 252  */
 253 int
 254 mac_roman_to_utf8(Str31 hfs_str, ByteCount maxDstLen, ByteCount *actualDstLen, unsigned char* dstStr)
 255 {
 256         int error;
 257         UniChar uniStr[MAX_HFS_UNICODE_CHARS];
 258         ItemCount uniCount;
 259         size_t utf8len;
 260
 261         error = mac_roman_to_unicode(hfs_str, uniStr, MAX_HFS_UNICODE_CHARS, &uniCount);
 262
 263         if (uniCount == 0)
 264                 error = EINVAL;
 265
 266         if (error == 0) {
 267                 error = utf8_encodestr(uniStr, uniCount * sizeof(UniChar), dstStr, &utf8len, maxDstLen , ':', 0);
 268                 if (error == ENAMETOOLONG)
 269                         *actualDstLen = utf8_encodelen(uniStr, uniCount * sizeof(UniChar), ':', 0);
 270                 else
 271                         *actualDstLen = utf8len;
 272         }
 273
 274         return error;
 275 }
 276
 277
 278 /*
 279  * Convert Unicode string into HFS encoding
 280  *
 281  * ':' chars are converted to '/'
 282  * Assumes input represents fully decomposed Unicode
 283  */
 284 int
 285 unicode_to_hfs(ExtendedVCB *vcb, ByteCount srcLen, u_int16_t* srcStr, Str31 dstStr, int retry)
 286 {
 287         int error;
 288         unicode_to_hfs_func_t hfs_get_hfsname = VCBTOHFS(vcb)->hfs_get_hfsname;
 289
 290         error = hfs_get_hfsname(srcStr, srcLen/sizeof(UniChar), dstStr);
 291         if (error && retry) {
 292                 error = unicode_to_mac_roman(srcStr, srcLen/sizeof(UniChar), dstStr);
 293         }
 294         return error;
 295 }
 296
 297 /*
 298  * Convert UTF-8 string into HFS encoding
 299  *
 300  * ':' chars are converted to '/'
 301  * Assumes input represents fully decomposed Unicode
 302  */
 303 int
 304 utf8_to_hfs(ExtendedVCB *vcb, ByteCount srcLen, const unsigned char* srcStr, Str31 dstStr/*, int retry*/)
 305 {
 306         int error;
 307         UniChar uniStr[MAX_HFS_UNICODE_CHARS];
 308         size_t ucslen;
 309
 310         error = utf8_decodestr(srcStr, srcLen, uniStr, &ucslen, sizeof(uniStr), ':', 0);
 311         if (error == 0)
 312                 error = unicode_to_hfs(vcb, ucslen, uniStr, dstStr, 1);
 313
 314         return error;
 315 }
 316
 317 int
 318 utf8_to_mac_roman(ByteCount srcLen, const unsigned char* srcStr, Str31 dstStr)
 319 {
 320         int error;
 321         UniChar uniStr[MAX_HFS_UNICODE_CHARS];
 322         size_t ucslen;
 323
 324         error = utf8_decodestr(srcStr, srcLen, uniStr, &ucslen, sizeof(uniStr), ':', 0);
 325         if (error == 0)
 326                 error = unicode_to_mac_roman(uniStr, ucslen/sizeof(UniChar), dstStr);
 327
 328         return error;
 329 }
 330
 331 /*
 332  * HFS MacRoman to/from Unicode conversions are built into the kernel
 333  * All others hfs encodings are loadable.
 334  */
 335
 336 /* 0x00A0 - 0x00FF = Latin 1 Supplement (30 total) */
 337 static UInt8 gLatin1Table[] = {
 338   /*              0     1     2     3     4     5     6     7     8     9     A     B     C     D     E     F  */
 339   /* 0x00A0 */  0xCA, 0xC1, 0xA2, 0xA3, 0xDB, 0xB4,  '?', 0xA4, 0xAC, 0xA9, 0xBB, 0xC7, 0xC2,  '?', 0xA8, 0xF8,
 340   /* 0x00B0 */  0xA1, 0XB1,  '?',  '?', 0xAB, 0xB5, 0xA6, 0xe1, 0xFC,  '?', 0xBC, 0xC8,  '?',  '?',  '?', 0xC0,
 341   /* 0x00C0 */   '?',  '?',  '?',  '?',  '?',  '?', 0xAE,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 342   /* 0x00D0 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xAF,  '?',  '?',  '?',  '?',  '?',  '?', 0xA7,
 343   /* 0x00E0 */   '?',  '?',  '?',  '?',  '?',  '?', 0xBE,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 344   /* 0x00F0 */   '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xD6, 0xBF,  '?',  '?',  '?',  '?',  '?',  '?',  '?'
 345 };
 346
 347 /* 0x02C0 - 0x02DF = Spacing Modifiers (8 total) */
 348 static UInt8 gSpaceModsTable[] = {
 349   /*              0     1     2     3     4     5     6     7     8     9     A     B     C     D     E     F  */
 350   /* 0x02C0 */   '?',  '?',  '?',  '?',  '?',  '?', 0xF6, 0xFF,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 351   /* 0x02D0 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xF9, 0xFA, 0xFB, 0xFE, 0xF7, 0xFD,  '?',  '?'
 352 };
 353
 354 /* 0x2010 - 0x20AF = General Punctuation (17 total) */
 355 static UInt8 gPunctTable[] = {
 356   /*              0     1     2     3     4     5     6     7     8     9     A     B     C     D     E     F  */
 357   /* 0x2010 */   '?',  '?',  '?', 0xd0, 0xd1,  '?',  '?',  '?', 0xd4, 0xd5, 0xe2,  '?', 0xd2, 0xd3, 0xe3,  '?',
 358   /* 0x2020 */  0xa0, 0xe0, 0xa5,  '?',  '?',  '?', 0xc9,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 359   /* 0x2030 */  0xe4,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xdc, 0xdd,  '?',  '?',  '?',  '?',  '?',
 360   /* 0x2040 */   '?',  '?',  '?',  '?', 0xda,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 361   /* 0x2050 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 362   /* 0x2060 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 363   /* 0x2070 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 364   /* 0x2080 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 365   /* 0x2090 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 366   /* 0x20A0 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xdb,  '?',  '?',  '?'
 367 };
 368
 369 /* 0x22xx = Mathematical Operators (11 total) */
 370 static UInt8 gMathTable[] = {
 371   /*              0     1     2     3     4     5     6     7     8     9     A     B     C     D     E     F  */
 372   /* 0x2200 */   '?',  '?', 0xb6,  '?',  '?',  '?', 0xc6,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xb8,
 373   /* 0x2210 */   '?', 0xb7,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xc3,  '?',  '?',  '?', 0xb0,  '?',
 374   /* 0x2220 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xba,  '?',  '?',  '?',  '?',
 375   /* 0x2230 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 376   /* 0x2240 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xc5,  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 377   /* 0x2250 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 378   /* 0x2260 */  0xad,  '?',  '?',  '?', 0xb2, 0xb3,  '?',  '?'
 379 };
 380
 381 /* */
 382 static UInt8 gReverseCombTable[] = {
 383   /*              0     1     2     3     4     5     6     7     8     9     A     B     C     D     E     F  */
 384   /* 0x40 */    0xDA, 0x40, 0xDA, 0xDA, 0xDA, 0x56, 0xDA, 0xDA, 0xDA, 0x6C, 0xDA, 0xDA, 0xDA, 0xDA, 0x82, 0x98,
 385   /* 0x50 */    0xDA, 0xDA, 0xDA, 0xDA, 0xDA, 0xAE, 0xDA, 0xDA, 0xDA, 0xC4, 0xDA, 0xDA, 0xDA, 0xDA, 0xDA, 0xDA,
 386   /* 0x60 */    0xDA, 0x4B, 0xDA, 0xDA, 0xDA, 0x61, 0xDA, 0xDA, 0xDA, 0x77, 0xDA, 0xDA, 0xDA, 0xDA, 0x8D, 0xA3,
 387   /* 0x70 */    0xDA, 0xDA, 0xDA, 0xDA, 0xDA, 0xB9, 0xDA, 0xDA, 0xDA, 0xCF, 0xDA, 0xDA, 0xDA, 0xDA, 0xDA, 0xDA,
 388
 389   /* Combining Diacritical Marks (0x0300 - 0x030A) */
 390   /*              0     1     2     3     4     5     6     7     8     9     A  */
 391   /*  'A'   */
 392   /* 0x0300 */  0xCB, 0xE7, 0xE5, 0xCC,  '?',  '?',  '?',  '?', 0x80,  '?', 0x81,
 393
 394   /*  'a'   */
 395   /* 0x0300 */  0x88, 0x87, 0x89, 0x8B,  '?',  '?',  '?',  '?', 0x8A,  '?', 0x8C,
 396
 397   /*  'E'   */
 398   /* 0x0300 */  0xE9, 0x83, 0xE6,  '?',  '?',  '?',  '?',  '?', 0xE8,  '?',  '?',
 399
 400   /*  'e'   */
 401   /* 0x0300 */  0x8F, 0x8E, 0x90,  '?',  '?',  '?',  '?',  '?', 0x91,  '?',  '?',
 402
 403   /*  'I'   */
 404   /* 0x0300 */  0xED, 0xEA, 0xEB,  '?',  '?',  '?',  '?',  '?', 0xEC,  '?',  '?',
 405
 406   /*  'i'   */
 407   /* 0x0300 */  0x93, 0x92, 0x94,  '?',  '?',  '?',  '?',  '?', 0x95,  '?',  '?',
 408
 409   /*  'N'   */
 410   /* 0x0300 */   '?',  '?',  '?', 0x84,  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 411
 412   /*  'n'   */
 413   /* 0x0300 */   '?',  '?',  '?', 0x96,  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 414
 415   /*  'O'   */
 416   /* 0x0300 */  0xF1, 0xEE, 0xEF, 0xCD,  '?',  '?',  '?',  '?', 0x85,  '?',  '?',
 417
 418   /*  'o'   */
 419   /* 0x0300 */  0x98, 0x97, 0x99, 0x9B,  '?',  '?',  '?',  '?', 0x9A,  '?',  '?',
 420
 421   /*  'U'   */
 422   /* 0x0300 */  0xF4, 0xF2, 0xF3,  '?',  '?',  '?',  '?',  '?', 0x86,  '?',  '?',
 423
 424   /*  'u'   */
 425   /* 0x0300 */  0x9D, 0x9C, 0x9E,  '?',  '?',  '?',  '?',  '?', 0x9F,  '?',  '?',
 426
 427   /*  'Y'   */
 428   /* 0x0300 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xD9,  '?',  '?',
 429
 430   /*  'y'   */
 431   /* 0x0300 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xD8,  '?',  '?',
 432
 433   /*  else  */
 434   /* 0x0300 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?'
 435 };
 436
 437
 438 /*
 439  * Convert Unicode string into HFS MacRoman encoding
 440  *
 441  * Assumes Unicode input is fully decomposed
 442  */
 443 static int unicode_to_mac_roman(UniChar *uni_str, UInt32 unicodeChars, Str31 hfs_str)
 444 {
 445         UInt8           *p;
 446         const UniChar   *u;
 447         UniChar         c;
 448         UniChar         mask;
 449         UInt16          inputChars;
 450         UInt16          pascalChars;
 451         OSErr           result = noErr;
 452         UInt8           lsb;
 453         UInt8           prevChar;
 454         UInt8           mc;
 455
 456         mask = (UniChar) 0xFF80;
 457         p = &hfs_str[1];
 458         u = uni_str;
 459         inputChars = unicodeChars;
 460         pascalChars = prevChar = 0;
 461
 462         while (inputChars) {
 463                 c = *(u++);
 464                 lsb = (UInt8) c;
 465
 466                 /*
 467                  * If its not 7-bit ascii, then we need to map it
 468                  */
 469                 if ( c & mask ) {
 470                         mc = '?';
 471                         switch (c & 0xFF00) {
 472                         case 0x0000:
 473                                 if (lsb >= 0xA0)
 474                                         mc = gLatin1Table[lsb - 0xA0];
 475                                 break;
 476
 477                         case 0x0200:
 478                                 if (lsb >= 0xC0 && lsb <= 0xDF)
 479                                         mc = gSpaceModsTable[lsb - 0xC0];
 480                                 break;
 481
 482                         case 0x2000:
 483                                 if (lsb >= 0x10 && lsb <= 0xAF)
 484                                         mc = gPunctTable[lsb- 0x10];
 485                                 break;
 486
 487                         case 0x2200:
 488                                 if (lsb <= 0x68)
 489                                         mc = gMathTable[lsb];
 490                                 break;
 491
 492                         case 0x0300:
 493                                 if (c <= 0x030A) {
 494                                         if (prevChar >= 'A' && prevChar < 'z') {
 495                                                 mc = gReverseCombTable[gReverseCombTable[prevChar - 0x40] + lsb];
 496                                                 --p;    /* backup over base char */
 497                                                 --pascalChars;
 498                                         }
 499                                 } else {
 500                                         switch (c) {
 501                                         case 0x0327:    /* combining cedilla */
 502                                                 if (prevChar == 'C')
 503                                                         mc = 0x82;
 504                                                 else if (prevChar == 'c')
 505                                                         mc = 0x8D;
 506                                                 else
 507                                                         break;
 508                                                 --p;    /* backup over base char */
 509                                                 --pascalChars;
 510                                                 break;
 511
 512                                         case 0x03A9: mc = 0xBD; break;  /* omega */
 513
 514                                         case 0x03C0: mc = 0xB9; break;  /* pi */
 515                                         }
 516                                 }
 517                                 break;
 518
 519                         default:
 520                                 switch (c) {
 521                                 case 0x0131: mc = 0xf5; break;  /* dotless i */
 522
 523                                 case 0x0152: mc = 0xce; break;  /* OE */
 524
 525                                 case 0x0153: mc = 0xcf; break;  /* oe */
 526
 527                                 case 0x0192: mc = 0xc4; break;  /* Ä */
 528
 529                                 case 0x2122: mc = 0xaa; break;  /* TM */
 530
 531                                 case 0x25ca: mc = 0xd7; break;  /* diamond */
 532
 533                                 case 0xf8ff: mc = 0xf0; break;  /* apple logo */
 534
 535                                 case 0xfb01: mc = 0xde; break;  /* fi */
 536
 537                                 case 0xfb02: mc = 0xdf; break;  /* fl */
 538                                 }
 539                         } /* end switch (c & 0xFF00) */
 540
 541                         /*
 542                          * If we have an unmapped character then we need to mangle the name...
 543                          */
 544                         if (mc == '?')
 545                                 result = kTECUsedFallbacksStatus;
 546
 547                         prevChar = 0;
 548                         lsb = mc;
 549
 550                 } else {
 551                         prevChar = lsb;
 552                 }
 553
 554                 if (pascalChars >= 31)
 555                         break;
 556
 557                 *(p++) = lsb;
 558                 ++pascalChars;
 559                 --inputChars;
 560
 561         } /* end while */
 562
 563         hfs_str[0] = pascalChars;
 564
 565         if (inputChars > 0)
 566                 result = ENAMETOOLONG;  /* ran out of room! */
 567
 568         return result;
 569 }
 570
 571
 572 static UniChar gHiBitBaseUnicode[128] = {
 573   /* 0x80 */    0x0041, 0x0041, 0x0043, 0x0045, 0x004e, 0x004f, 0x0055, 0x0061,
 574   /* 0x88 */    0x0061, 0x0061, 0x0061, 0x0061, 0x0061, 0x0063, 0x0065, 0x0065,
 575   /* 0x90 */    0x0065, 0x0065, 0x0069, 0x0069, 0x0069, 0x0069, 0x006e, 0x006f,
 576   /* 0x98 */    0x006f, 0x006f, 0x006f, 0x006f, 0x0075, 0x0075, 0x0075, 0x0075,
 577   /* 0xa0 */    0x2020, 0x00b0, 0x00a2, 0x00a3, 0x00a7, 0x2022, 0x00b6, 0x00df,
 578   /* 0xa8 */    0x00ae, 0x00a9, 0x2122, 0x00b4, 0x00a8, 0x2260, 0x00c6, 0x00d8,
 579   /* 0xb0 */    0x221e, 0x00b1, 0x2264, 0x2265, 0x00a5, 0x00b5, 0x2202, 0x2211,
 580   /* 0xb8 */    0x220f, 0x03c0, 0x222b, 0x00aa, 0x00ba, 0x03a9, 0x00e6, 0x00f8,
 581   /* 0xc0 */    0x00bf, 0x00a1, 0x00ac, 0x221a, 0x0192, 0x2248, 0x2206, 0x00ab,
 582   /* 0xc8 */    0x00bb, 0x2026, 0x00a0, 0x0041, 0x0041, 0x004f, 0x0152, 0x0153,
 583   /* 0xd0 */    0x2013, 0x2014, 0x201c, 0x201d, 0x2018, 0x2019, 0x00f7, 0x25ca,
 584   /* 0xd8 */    0x0079, 0x0059, 0x2044, 0x20ac, 0x2039, 0x203a, 0xfb01, 0xfb02,
 585   /* 0xe0 */    0x2021, 0x00b7, 0x201a, 0x201e, 0x2030, 0x0041, 0x0045, 0x0041,
 586   /* 0xe8 */    0x0045, 0x0045, 0x0049, 0x0049, 0x0049, 0x0049, 0x004f, 0x004f,
 587   /* 0xf0 */    0xf8ff, 0x004f, 0x0055, 0x0055, 0x0055, 0x0131, 0x02c6, 0x02dc,
 588   /* 0xf8 */    0x00af, 0x02d8, 0x02d9, 0x02da, 0x00b8, 0x02dd, 0x02db, 0x02c7
 589 };
 590
 591 static UniChar gHiBitCombUnicode[128] = {
 592   /* 0x80 */    0x0308, 0x030a, 0x0327, 0x0301, 0x0303, 0x0308, 0x0308, 0x0301,
 593   /* 0x88 */    0x0300, 0x0302, 0x0308, 0x0303, 0x030a, 0x0327, 0x0301, 0x0300,
 594   /* 0x90 */    0x0302, 0x0308, 0x0301, 0x0300, 0x0302, 0x0308, 0x0303, 0x0301,
 595   /* 0x98 */    0x0300, 0x0302, 0x0308, 0x0303, 0x0301, 0x0300, 0x0302, 0x0308,
 596   /* 0xa0 */    0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 597   /* 0xa8 */    0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 598   /* 0xb0 */    0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 599   /* 0xb8 */    0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 600   /* 0xc0 */    0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 601   /* 0xc8 */    0x0000, 0x0000, 0x0000, 0x0300, 0x0303, 0x0303, 0x0000, 0x0000,
 602   /* 0xd0 */    0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 603   /* 0xd8 */    0x0308, 0x0308, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 604   /* 0xe0 */    0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0302, 0x0302, 0x0301,
 605   /* 0xe8 */    0x0308, 0x0300, 0x0301, 0x0302, 0x0308, 0x0300, 0x0301, 0x0302,
 606   /* 0xf0 */    0x0000, 0x0300, 0x0301, 0x0302, 0x0300, 0x0000, 0x0000, 0x0000,
 607   /* 0xf8 */    0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000
 608 };
 609
 610
 611 /*
 612  * Convert HFS MacRoman encoded string into Unicode
 613  *
 614  * Unicode output is fully decomposed
 615  */
 616 int
 617 mac_roman_to_unicode(Str31 hfs_str, UniChar *uni_str,
 618                                 UInt32 maxCharLen, UInt32 *unicodeChars)
 619 {
 620         const UInt8  *p;
 621         UniChar  *u;
 622         UInt16  pascalChars;
 623         UInt8  c;
 624
 625         p = hfs_str;
 626         u = uni_str;
 627
 628         *unicodeChars = pascalChars = *(p++);   /* pick up length byte */
 629
 630         while (pascalChars--) {
 631                 c = *(p++);
 632
 633                 if ( (SInt8) c >= 0 ) {         /* check if seven bit ascii */
 634                         *(u++) = (UniChar) c;   /* just pad high byte with zero */
 635                 } else { /* its a hi bit character */
 636                         UniChar uc;
 637
 638                         c &= 0x7F;
 639                         *(u++) = uc = gHiBitBaseUnicode[c];
 640
 641                         /*
 642                          * if the unicode character we get back is an alpha char
 643                          * then we must have an additional combining character
 644                          */
 645                         if ((uc <= (UniChar) 'z') && (uc >= (UniChar) 'A')) {
 646                                 *(u++) = gHiBitCombUnicode[c];
 647                                 ++(*unicodeChars);
 648                         }
 649                 }
 650         }
 651
 652         return noErr;
 653 }
 654