bsd/hfs/hfs_encodings.c

   1 /*
   2  * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #include <sys/param.h>
  30 #include <sys/systm.h>
  31 #include <sys/kernel.h>
  32 #include <sys/malloc.h>
  33 #include <sys/queue.h>
  34 #include <sys/utfconv.h>
  35
  36 #include "hfs.h"
  37
  38
  39 lck_grp_t * encodinglst_lck_grp;
  40 lck_grp_attr_t * encodinglst_lck_grp_attr;
  41 lck_attr_t * encodinglst_lck_attr;
  42
  43
  44 /* hfs encoding converter list */
  45 SLIST_HEAD(encodinglst, hfs_encoding) hfs_encoding_list = {0};
  46
  47 lck_mtx_t  encodinglst_mutex;
  48
  49
  50
  51 /* hfs encoding converter entry */
  52 struct  hfs_encoding {
  53         SLIST_ENTRY(hfs_encoding)  link;
  54         int                     refcount;
  55         int                     kmod_id;
  56         UInt32                  encoding;
  57         hfs_to_unicode_func_t   get_unicode_func;
  58         unicode_to_hfs_func_t   get_hfsname_func;
  59 };
  60
  61 /* XXX We should use an "official" interface! */
  62 extern kern_return_t kmod_destroy(host_priv_t host_priv, kmod_t id);
  63 extern struct host realhost;
  64
  65 #define MAX_HFS_UNICODE_CHARS   (15*5)
  66
  67 int mac_roman_to_unicode(const Str31 hfs_str, UniChar *uni_str, UInt32 maxCharLen, UInt32 *usedCharLen);
  68
  69 static int unicode_to_mac_roman(UniChar *uni_str, UInt32 unicodeChars, Str31 hfs_str);
  70
  71
  72 void
  73 hfs_converterinit(void)
  74 {
  75         SLIST_INIT(&hfs_encoding_list);
  76
  77         encodinglst_lck_grp_attr= lck_grp_attr_alloc_init();
  78         lck_grp_attr_setstat(encodinglst_lck_grp_attr);
  79         encodinglst_lck_grp  = lck_grp_alloc_init("cnode_hash", encodinglst_lck_grp_attr);
  80
  81         encodinglst_lck_attr = lck_attr_alloc_init();
  82         //lck_attr_setdebug(encodinglst_lck_attr);
  83
  84         lck_mtx_init(&encodinglst_mutex, encodinglst_lck_grp, encodinglst_lck_attr);
  85
  86         /*
  87          * add resident MacRoman converter and take a reference
  88          * since its always "loaded".
  89          */
  90         hfs_addconverter(0, kTextEncodingMacRoman, mac_roman_to_unicode, unicode_to_mac_roman);
  91         SLIST_FIRST(&hfs_encoding_list)->refcount++;
  92 }
  93
  94
  95 /*
  96  * hfs_addconverter - add an HFS encoding converter
  97  *
  98  * This is called exclusivly by kernel loadable modules
  99  * (like HFS_Japanese.kmod) to register hfs encoding
 100  * conversion routines.
 101  *
 102  */
 103 int
 104 hfs_addconverter(int id, UInt32 encoding, hfs_to_unicode_func_t get_unicode, unicode_to_hfs_func_t get_hfsname)
 105 {
 106         struct hfs_encoding *encp;
 107
 108         MALLOC(encp, struct hfs_encoding *, sizeof(struct hfs_encoding), M_TEMP, M_WAITOK);
 109
 110         lck_mtx_lock(&encodinglst_mutex);
 111
 112         encp->link.sle_next = NULL;
 113         encp->refcount = 0;
 114         encp->encoding = encoding;
 115         encp->get_unicode_func = get_unicode;
 116         encp->get_hfsname_func = get_hfsname;
 117         encp->kmod_id = id;
 118         SLIST_INSERT_HEAD(&hfs_encoding_list, encp, link);
 119
 120         lck_mtx_unlock(&encodinglst_mutex);
 121         return (0);
 122 }
 123
 124
 125 /*
 126  * hfs_remconverter - remove an HFS encoding converter
 127  *
 128  * Can be called by a kernel loadable module's finalize
 129  * routine to remove an encoding converter so that the
 130  * module (i.e. the code) can be unloaded.
 131  *
 132  * However, in the normal case, the removing and unloading
 133  * of these converters is done in hfs_relconverter.
 134  * The call is initiated from within the kernel during the unmounting of an hfs voulume.
 135  */
 136 int
 137 hfs_remconverter(int id, UInt32 encoding)
 138 {
 139         struct hfs_encoding *encp;
 140
 141         lck_mtx_lock(&encodinglst_mutex);
 142         SLIST_FOREACH(encp, &hfs_encoding_list, link) {
 143                 if (encp->encoding == encoding && encp->kmod_id == id) {
 144                         encp->refcount--;
 145
 146                         /* if converter is no longer in use, release it */
 147                         if (encp->refcount <= 0 && encp->kmod_id != 0) {
 148                                 SLIST_REMOVE(&hfs_encoding_list, encp, hfs_encoding, link);
 149                                 lck_mtx_unlock(&encodinglst_mutex);
 150                                 FREE(encp, M_TEMP);
 151                                 return (0);
 152                         } else {
 153                                 lck_mtx_unlock(&encodinglst_mutex);
 154                                 return (1);   /* busy */
 155                         }
 156                         break;
 157                 }
 158         }
 159         lck_mtx_unlock(&encodinglst_mutex);
 160
 161         return (0);
 162 }
 163
 164
 165 /*
 166  * hfs_getconverter - get HFS encoding converters
 167  *
 168  * Normally called during the mounting of an hfs voulume.
 169  */
 170 int
 171 hfs_getconverter(UInt32 encoding, hfs_to_unicode_func_t *get_unicode, unicode_to_hfs_func_t *get_hfsname)
 172 {
 173         struct hfs_encoding *encp;
 174         int found = 0;
 175
 176         lck_mtx_lock(&encodinglst_mutex);
 177         SLIST_FOREACH(encp, &hfs_encoding_list, link) {
 178                 if (encp->encoding == encoding) {
 179                         found = 1;
 180                         *get_unicode = encp->get_unicode_func;
 181                         *get_hfsname = encp->get_hfsname_func;
 182                         ++encp->refcount;
 183                         break;
 184                 }
 185         }
 186         lck_mtx_unlock(&encodinglst_mutex);
 187
 188         if (!found) {
 189                 *get_unicode = NULL;
 190                 *get_hfsname = NULL;
 191                 return (EINVAL);
 192         }
 193
 194         return (0);
 195 }
 196
 197
 198 /*
 199  * hfs_relconverter - release interest in an HFS encoding converter
 200  *
 201  * Normally called during the unmounting of an hfs voulume.
 202  */
 203 int
 204 hfs_relconverter(UInt32 encoding)
 205 {
 206         struct hfs_encoding *encp;
 207
 208         lck_mtx_lock(&encodinglst_mutex);
 209         SLIST_FOREACH(encp, &hfs_encoding_list, link) {
 210                 if (encp->encoding == encoding) {
 211                         encp->refcount--;
 212
 213                         /* if converter is no longer in use, release it */
 214                         if (encp->refcount <= 0 && encp->kmod_id != 0) {
 215                                 int id = encp->kmod_id;
 216
 217                                 SLIST_REMOVE(&hfs_encoding_list, encp, hfs_encoding, link);
 218                                 lck_mtx_unlock(&encodinglst_mutex);
 219
 220                                 FREE(encp, M_TEMP);
 221                                 kmod_destroy((host_priv_t) host_priv_self(), id);
 222                                 return (0);
 223                         }
 224                         lck_mtx_unlock(&encodinglst_mutex);
 225                         return (0);
 226                 }
 227         }
 228         lck_mtx_unlock(&encodinglst_mutex);
 229
 230         return (EINVAL);
 231 }
 232
 233
 234 /*
 235  * Convert HFS encoded string into UTF-8
 236  *
 237  * Unicode output is fully decomposed
 238  * '/' chars are converted to ':'
 239  */
 240 int
 241 hfs_to_utf8(ExtendedVCB *vcb, Str31 hfs_str, ByteCount maxDstLen, ByteCount *actualDstLen, unsigned char* dstStr)
 242 {
 243         int error;
 244         UniChar uniStr[MAX_HFS_UNICODE_CHARS];
 245         ItemCount uniCount;
 246         size_t utf8len;
 247         hfs_to_unicode_func_t hfs_get_unicode = VCBTOHFS(vcb)->hfs_get_unicode;
 248
 249         error = hfs_get_unicode(hfs_str, uniStr, MAX_HFS_UNICODE_CHARS, &uniCount);
 250
 251         if (uniCount == 0)
 252                 error = EINVAL;
 253
 254         if (error == 0) {
 255                 error = utf8_encodestr(uniStr, uniCount * sizeof(UniChar), dstStr, &utf8len, maxDstLen , ':', 0);
 256                 if (error == ENAMETOOLONG)
 257                         *actualDstLen = utf8_encodelen(uniStr, uniCount * sizeof(UniChar), ':', 0);
 258                 else
 259                         *actualDstLen = utf8len;
 260         }
 261
 262         return error;
 263 }
 264
 265
 266 /*
 267  * When an HFS name cannot be encoded with the current
 268  * volume encoding then MacRoman is used as a fallback.
 269  */
 270 int
 271 mac_roman_to_utf8(Str31 hfs_str, ByteCount maxDstLen, ByteCount *actualDstLen, unsigned char* dstStr)
 272 {
 273         int error;
 274         UniChar uniStr[MAX_HFS_UNICODE_CHARS];
 275         ItemCount uniCount;
 276         size_t utf8len;
 277
 278         error = mac_roman_to_unicode(hfs_str, uniStr, MAX_HFS_UNICODE_CHARS, &uniCount);
 279
 280         if (uniCount == 0)
 281                 error = EINVAL;
 282
 283         if (error == 0) {
 284                 error = utf8_encodestr(uniStr, uniCount * sizeof(UniChar), dstStr, &utf8len, maxDstLen , ':', 0);
 285                 if (error == ENAMETOOLONG)
 286                         *actualDstLen = utf8_encodelen(uniStr, uniCount * sizeof(UniChar), ':', 0);
 287                 else
 288                         *actualDstLen = utf8len;
 289         }
 290
 291         return error;
 292 }
 293
 294
 295 /*
 296  * Convert Unicode string into HFS encoding
 297  *
 298  * ':' chars are converted to '/'
 299  * Assumes input represents fully decomposed Unicode
 300  */
 301 int
 302 unicode_to_hfs(ExtendedVCB *vcb, ByteCount srcLen, u_int16_t* srcStr, Str31 dstStr, int retry)
 303 {
 304         int error;
 305         unicode_to_hfs_func_t hfs_get_hfsname = VCBTOHFS(vcb)->hfs_get_hfsname;
 306
 307         error = hfs_get_hfsname(srcStr, srcLen/sizeof(UniChar), dstStr);
 308         if (error && retry) {
 309                 error = unicode_to_mac_roman(srcStr, srcLen/sizeof(UniChar), dstStr);
 310         }
 311         return error;
 312 }
 313
 314 /*
 315  * Convert UTF-8 string into HFS encoding
 316  *
 317  * ':' chars are converted to '/'
 318  * Assumes input represents fully decomposed Unicode
 319  */
 320 int
 321 utf8_to_hfs(ExtendedVCB *vcb, ByteCount srcLen, const unsigned char* srcStr, Str31 dstStr/*, int retry*/)
 322 {
 323         int error;
 324         UniChar uniStr[MAX_HFS_UNICODE_CHARS];
 325         size_t ucslen;
 326
 327         error = utf8_decodestr(srcStr, srcLen, uniStr, &ucslen, sizeof(uniStr), ':', 0);
 328         if (error == 0)
 329                 error = unicode_to_hfs(vcb, ucslen, uniStr, dstStr, 1);
 330
 331         return error;
 332 }
 333
 334 int
 335 utf8_to_mac_roman(ByteCount srcLen, const unsigned char* srcStr, Str31 dstStr)
 336 {
 337         int error;
 338         UniChar uniStr[MAX_HFS_UNICODE_CHARS];
 339         size_t ucslen;
 340
 341         error = utf8_decodestr(srcStr, srcLen, uniStr, &ucslen, sizeof(uniStr), ':', 0);
 342         if (error == 0)
 343                 error = unicode_to_mac_roman(uniStr, ucslen/sizeof(UniChar), dstStr);
 344
 345         return error;
 346 }
 347
 348 /*
 349  * HFS MacRoman to/from Unicode conversions are built into the kernel
 350  * All others hfs encodings are loadable.
 351  */
 352
 353 /* 0x00A0 - 0x00FF = Latin 1 Supplement (30 total) */
 354 static UInt8 gLatin1Table[] = {
 355   /*              0     1     2     3     4     5     6     7     8     9     A     B     C     D     E     F  */
 356   /* 0x00A0 */  0xCA, 0xC1, 0xA2, 0xA3, 0xDB, 0xB4,  '?', 0xA4, 0xAC, 0xA9, 0xBB, 0xC7, 0xC2,  '?', 0xA8, 0xF8,
 357   /* 0x00B0 */  0xA1, 0XB1,  '?',  '?', 0xAB, 0xB5, 0xA6, 0xe1, 0xFC,  '?', 0xBC, 0xC8,  '?',  '?',  '?', 0xC0,
 358   /* 0x00C0 */   '?',  '?',  '?',  '?',  '?',  '?', 0xAE,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 359   /* 0x00D0 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xAF,  '?',  '?',  '?',  '?',  '?',  '?', 0xA7,
 360   /* 0x00E0 */   '?',  '?',  '?',  '?',  '?',  '?', 0xBE,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 361   /* 0x00F0 */   '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xD6, 0xBF,  '?',  '?',  '?',  '?',  '?',  '?',  '?'
 362 };
 363
 364 /* 0x02C0 - 0x02DF = Spacing Modifiers (8 total) */
 365 static UInt8 gSpaceModsTable[] = {
 366   /*              0     1     2     3     4     5     6     7     8     9     A     B     C     D     E     F  */
 367   /* 0x02C0 */   '?',  '?',  '?',  '?',  '?',  '?', 0xF6, 0xFF,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 368   /* 0x02D0 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xF9, 0xFA, 0xFB, 0xFE, 0xF7, 0xFD,  '?',  '?'
 369 };
 370
 371 /* 0x2010 - 0x20AF = General Punctuation (17 total) */
 372 static UInt8 gPunctTable[] = {
 373   /*              0     1     2     3     4     5     6     7     8     9     A     B     C     D     E     F  */
 374   /* 0x2010 */   '?',  '?',  '?', 0xd0, 0xd1,  '?',  '?',  '?', 0xd4, 0xd5, 0xe2,  '?', 0xd2, 0xd3, 0xe3,  '?',
 375   /* 0x2020 */  0xa0, 0xe0, 0xa5,  '?',  '?',  '?', 0xc9,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 376   /* 0x2030 */  0xe4,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xdc, 0xdd,  '?',  '?',  '?',  '?',  '?',
 377   /* 0x2040 */   '?',  '?',  '?',  '?', 0xda,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 378   /* 0x2050 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 379   /* 0x2060 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 380   /* 0x2070 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 381   /* 0x2080 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 382   /* 0x2090 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 383   /* 0x20A0 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xdb,  '?',  '?',  '?'
 384 };
 385
 386 /* 0x22xx = Mathematical Operators (11 total) */
 387 static UInt8 gMathTable[] = {
 388   /*              0     1     2     3     4     5     6     7     8     9     A     B     C     D     E     F  */
 389   /* 0x2200 */   '?',  '?', 0xb6,  '?',  '?',  '?', 0xc6,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xb8,
 390   /* 0x2210 */   '?', 0xb7,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xc3,  '?',  '?',  '?', 0xb0,  '?',
 391   /* 0x2220 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xba,  '?',  '?',  '?',  '?',
 392   /* 0x2230 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 393   /* 0x2240 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xc5,  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 394   /* 0x2250 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 395   /* 0x2260 */  0xad,  '?',  '?',  '?', 0xb2, 0xb3,  '?',  '?'
 396 };
 397
 398 /* */
 399 static UInt8 gReverseCombTable[] = {
 400   /*              0     1     2     3     4     5     6     7     8     9     A     B     C     D     E     F  */
 401   /* 0x40 */    0xDA, 0x40, 0xDA, 0xDA, 0xDA, 0x56, 0xDA, 0xDA, 0xDA, 0x6C, 0xDA, 0xDA, 0xDA, 0xDA, 0x82, 0x98,
 402   /* 0x50 */    0xDA, 0xDA, 0xDA, 0xDA, 0xDA, 0xAE, 0xDA, 0xDA, 0xDA, 0xC4, 0xDA, 0xDA, 0xDA, 0xDA, 0xDA, 0xDA,
 403   /* 0x60 */    0xDA, 0x4B, 0xDA, 0xDA, 0xDA, 0x61, 0xDA, 0xDA, 0xDA, 0x77, 0xDA, 0xDA, 0xDA, 0xDA, 0x8D, 0xA3,
 404   /* 0x70 */    0xDA, 0xDA, 0xDA, 0xDA, 0xDA, 0xB9, 0xDA, 0xDA, 0xDA, 0xCF, 0xDA, 0xDA, 0xDA, 0xDA, 0xDA, 0xDA,
 405
 406   /* Combining Diacritical Marks (0x0300 - 0x030A) */
 407   /*              0     1     2     3     4     5     6     7     8     9     A  */
 408   /*  'A'   */
 409   /* 0x0300 */  0xCB, 0xE7, 0xE5, 0xCC,  '?',  '?',  '?',  '?', 0x80,  '?', 0x81,
 410
 411   /*  'a'   */
 412   /* 0x0300 */  0x88, 0x87, 0x89, 0x8B,  '?',  '?',  '?',  '?', 0x8A,  '?', 0x8C,
 413
 414   /*  'E'   */
 415   /* 0x0300 */  0xE9, 0x83, 0xE6,  '?',  '?',  '?',  '?',  '?', 0xE8,  '?',  '?',
 416
 417   /*  'e'   */
 418   /* 0x0300 */  0x8F, 0x8E, 0x90,  '?',  '?',  '?',  '?',  '?', 0x91,  '?',  '?',
 419
 420   /*  'I'   */
 421   /* 0x0300 */  0xED, 0xEA, 0xEB,  '?',  '?',  '?',  '?',  '?', 0xEC,  '?',  '?',
 422
 423   /*  'i'   */
 424   /* 0x0300 */  0x93, 0x92, 0x94,  '?',  '?',  '?',  '?',  '?', 0x95,  '?',  '?',
 425
 426   /*  'N'   */
 427   /* 0x0300 */   '?',  '?',  '?', 0x84,  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 428
 429   /*  'n'   */
 430   /* 0x0300 */   '?',  '?',  '?', 0x96,  '?',  '?',  '?',  '?',  '?',  '?',  '?',
 431
 432   /*  'O'   */
 433   /* 0x0300 */  0xF1, 0xEE, 0xEF, 0xCD,  '?',  '?',  '?',  '?', 0x85,  '?',  '?',
 434
 435   /*  'o'   */
 436   /* 0x0300 */  0x98, 0x97, 0x99, 0x9B,  '?',  '?',  '?',  '?', 0x9A,  '?',  '?',
 437
 438   /*  'U'   */
 439   /* 0x0300 */  0xF4, 0xF2, 0xF3,  '?',  '?',  '?',  '?',  '?', 0x86,  '?',  '?',
 440
 441   /*  'u'   */
 442   /* 0x0300 */  0x9D, 0x9C, 0x9E,  '?',  '?',  '?',  '?',  '?', 0x9F,  '?',  '?',
 443
 444   /*  'Y'   */
 445   /* 0x0300 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xD9,  '?',  '?',
 446
 447   /*  'y'   */
 448   /* 0x0300 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xD8,  '?',  '?',
 449
 450   /*  else  */
 451   /* 0x0300 */   '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?'
 452 };
 453
 454
 455 /*
 456  * Convert Unicode string into HFS MacRoman encoding
 457  *
 458  * Assumes Unicode input is fully decomposed
 459  */
 460 static int unicode_to_mac_roman(UniChar *uni_str, UInt32 unicodeChars, Str31 hfs_str)
 461 {
 462         UInt8           *p;
 463         const UniChar   *u;
 464         UniChar         c;
 465         UniChar         mask;
 466         UInt16          inputChars;
 467         UInt16          pascalChars;
 468         OSErr           result = noErr;
 469         UInt8           lsb;
 470         UInt8           prevChar;
 471         UInt8           mc;
 472
 473         mask = (UniChar) 0xFF80;
 474         p = &hfs_str[1];
 475         u = uni_str;
 476         inputChars = unicodeChars;
 477         pascalChars = prevChar = 0;
 478
 479         while (inputChars) {
 480                 c = *(u++);
 481                 lsb = (UInt8) c;
 482
 483                 /*
 484                  * If its not 7-bit ascii, then we need to map it
 485                  */
 486                 if ( c & mask ) {
 487                         mc = '?';
 488                         switch (c & 0xFF00) {
 489                         case 0x0000:
 490                                 if (lsb >= 0xA0)
 491                                         mc = gLatin1Table[lsb - 0xA0];
 492                                 break;
 493
 494                         case 0x0200:
 495                                 if (lsb >= 0xC0 && lsb <= 0xDF)
 496                                         mc = gSpaceModsTable[lsb - 0xC0];
 497                                 break;
 498
 499                         case 0x2000:
 500                                 if (lsb >= 0x10 && lsb <= 0xAF)
 501                                         mc = gPunctTable[lsb- 0x10];
 502                                 break;
 503
 504                         case 0x2200:
 505                                 if (lsb <= 0x68)
 506                                         mc = gMathTable[lsb];
 507                                 break;
 508
 509                         case 0x0300:
 510                                 if (c <= 0x030A) {
 511                                         if (prevChar >= 'A' && prevChar < 'z') {
 512                                                 mc = gReverseCombTable[gReverseCombTable[prevChar - 0x40] + lsb];
 513                                                 --p;    /* backup over base char */
 514                                                 --pascalChars;
 515                                         }
 516                                 } else {
 517                                         switch (c) {
 518                                         case 0x0327:    /* combining cedilla */
 519                                                 if (prevChar == 'C')
 520                                                         mc = 0x82;
 521                                                 else if (prevChar == 'c')
 522                                                         mc = 0x8D;
 523                                                 else
 524                                                         break;
 525                                                 --p;    /* backup over base char */
 526                                                 --pascalChars;
 527                                                 break;
 528
 529                                         case 0x03A9: mc = 0xBD; break;  /* omega */
 530
 531                                         case 0x03C0: mc = 0xB9; break;  /* pi */
 532                                         }
 533                                 }
 534                                 break;
 535
 536                         default:
 537                                 switch (c) {
 538                                 case 0x0131: mc = 0xf5; break;  /* dotless i */
 539
 540                                 case 0x0152: mc = 0xce; break;  /* OE */
 541
 542                                 case 0x0153: mc = 0xcf; break;  /* oe */
 543
 544                                 case 0x0192: mc = 0xc4; break;  /* Ä */
 545
 546                                 case 0x2122: mc = 0xaa; break;  /* TM */
 547
 548                                 case 0x25ca: mc = 0xd7; break;  /* diamond */
 549
 550                                 case 0xf8ff: mc = 0xf0; break;  /* apple logo */
 551
 552                                 case 0xfb01: mc = 0xde; break;  /* fi */
 553
 554                                 case 0xfb02: mc = 0xdf; break;  /* fl */
 555                                 }
 556                         } /* end switch (c & 0xFF00) */
 557
 558                         /*
 559                          * If we have an unmapped character then we need to mangle the name...
 560                          */
 561                         if (mc == '?')
 562                                 result = kTECUsedFallbacksStatus;
 563
 564                         prevChar = 0;
 565                         lsb = mc;
 566
 567                 } else {
 568                         prevChar = lsb;
 569                 }
 570
 571                 if (pascalChars >= 31)
 572                         break;
 573
 574                 *(p++) = lsb;
 575                 ++pascalChars;
 576                 --inputChars;
 577
 578         } /* end while */
 579
 580         hfs_str[0] = pascalChars;
 581
 582         if (inputChars > 0)
 583                 result = ENAMETOOLONG;  /* ran out of room! */
 584
 585         return result;
 586 }
 587
 588
 589 static UniChar gHiBitBaseUnicode[128] = {
 590   /* 0x80 */    0x0041, 0x0041, 0x0043, 0x0045, 0x004e, 0x004f, 0x0055, 0x0061,
 591   /* 0x88 */    0x0061, 0x0061, 0x0061, 0x0061, 0x0061, 0x0063, 0x0065, 0x0065,
 592   /* 0x90 */    0x0065, 0x0065, 0x0069, 0x0069, 0x0069, 0x0069, 0x006e, 0x006f,
 593   /* 0x98 */    0x006f, 0x006f, 0x006f, 0x006f, 0x0075, 0x0075, 0x0075, 0x0075,
 594   /* 0xa0 */    0x2020, 0x00b0, 0x00a2, 0x00a3, 0x00a7, 0x2022, 0x00b6, 0x00df,
 595   /* 0xa8 */    0x00ae, 0x00a9, 0x2122, 0x00b4, 0x00a8, 0x2260, 0x00c6, 0x00d8,
 596   /* 0xb0 */    0x221e, 0x00b1, 0x2264, 0x2265, 0x00a5, 0x00b5, 0x2202, 0x2211,
 597   /* 0xb8 */    0x220f, 0x03c0, 0x222b, 0x00aa, 0x00ba, 0x03a9, 0x00e6, 0x00f8,
 598   /* 0xc0 */    0x00bf, 0x00a1, 0x00ac, 0x221a, 0x0192, 0x2248, 0x2206, 0x00ab,
 599   /* 0xc8 */    0x00bb, 0x2026, 0x00a0, 0x0041, 0x0041, 0x004f, 0x0152, 0x0153,
 600   /* 0xd0 */    0x2013, 0x2014, 0x201c, 0x201d, 0x2018, 0x2019, 0x00f7, 0x25ca,
 601   /* 0xd8 */    0x0079, 0x0059, 0x2044, 0x20ac, 0x2039, 0x203a, 0xfb01, 0xfb02,
 602   /* 0xe0 */    0x2021, 0x00b7, 0x201a, 0x201e, 0x2030, 0x0041, 0x0045, 0x0041,
 603   /* 0xe8 */    0x0045, 0x0045, 0x0049, 0x0049, 0x0049, 0x0049, 0x004f, 0x004f,
 604   /* 0xf0 */    0xf8ff, 0x004f, 0x0055, 0x0055, 0x0055, 0x0131, 0x02c6, 0x02dc,
 605   /* 0xf8 */    0x00af, 0x02d8, 0x02d9, 0x02da, 0x00b8, 0x02dd, 0x02db, 0x02c7
 606 };
 607
 608 static UniChar gHiBitCombUnicode[128] = {
 609   /* 0x80 */    0x0308, 0x030a, 0x0327, 0x0301, 0x0303, 0x0308, 0x0308, 0x0301,
 610   /* 0x88 */    0x0300, 0x0302, 0x0308, 0x0303, 0x030a, 0x0327, 0x0301, 0x0300,
 611   /* 0x90 */    0x0302, 0x0308, 0x0301, 0x0300, 0x0302, 0x0308, 0x0303, 0x0301,
 612   /* 0x98 */    0x0300, 0x0302, 0x0308, 0x0303, 0x0301, 0x0300, 0x0302, 0x0308,
 613   /* 0xa0 */    0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 614   /* 0xa8 */    0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 615   /* 0xb0 */    0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 616   /* 0xb8 */    0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 617   /* 0xc0 */    0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 618   /* 0xc8 */    0x0000, 0x0000, 0x0000, 0x0300, 0x0303, 0x0303, 0x0000, 0x0000,
 619   /* 0xd0 */    0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 620   /* 0xd8 */    0x0308, 0x0308, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
 621   /* 0xe0 */    0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0302, 0x0302, 0x0301,
 622   /* 0xe8 */    0x0308, 0x0300, 0x0301, 0x0302, 0x0308, 0x0300, 0x0301, 0x0302,
 623   /* 0xf0 */    0x0000, 0x0300, 0x0301, 0x0302, 0x0300, 0x0000, 0x0000, 0x0000,
 624   /* 0xf8 */    0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000
 625 };
 626
 627
 628 /*
 629  * Convert HFS MacRoman encoded string into Unicode
 630  *
 631  * Unicode output is fully decomposed
 632  */
 633 int
 634 mac_roman_to_unicode(const Str31 hfs_str, UniChar *uni_str,
 635                                 UInt32 maxCharLen, UInt32 *unicodeChars)
 636 {
 637         const UInt8  *p;
 638         UniChar  *u;
 639         UInt16  pascalChars;
 640         UInt8  c;
 641
 642         p = hfs_str;
 643         u = uni_str;
 644
 645         *unicodeChars = pascalChars = *(p++);   /* pick up length byte */
 646
 647         while (pascalChars--) {
 648                 c = *(p++);
 649
 650                 if ( (SInt8) c >= 0 ) {         /* check if seven bit ascii */
 651                         *(u++) = (UniChar) c;   /* just pad high byte with zero */
 652                 } else { /* its a hi bit character */
 653                         UniChar uc;
 654
 655                         c &= 0x7F;
 656                         *(u++) = uc = gHiBitBaseUnicode[c];
 657
 658                         /*
 659                          * if the unicode character we get back is an alpha char
 660                          * then we must have an additional combining character
 661                          */
 662                         if ((uc <= (UniChar) 'z') && (uc >= (UniChar) 'A')) {
 663                                 *(u++) = gHiBitCombUnicode[c];
 664                                 ++(*unicodeChars);
 665                         }
 666                 }
 667         }
 668
 669         return noErr;
 670 }
 671