libs/lcms2/src/cmsio0.c

   1 //---------------------------------------------------------------------------------
   2 //
   3 //  Little Color Management System
   4 //  Copyright (c) 1998-2023 Marti Maria Saguer
   5 //
   6 // Permission is hereby granted, free of charge, to any person obtaining
   7 // a copy of this software and associated documentation files (the "Software"),
   8 // to deal in the Software without restriction, including without limitation
   9 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10 // and/or sell copies of the Software, and to permit persons to whom the Software
  11 // is furnished to do so, subject to the following conditions:
  12 //
  13 // The above copyright notice and this permission notice shall be included in
  14 // all copies or substantial portions of the Software.
  15 //
  16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  17 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
  18 // THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  19 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  20 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  21 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  22 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23 //
  24 //---------------------------------------------------------------------------------
  25 //
  26
  27 #include "lcms2_internal.h"
  28
  29 // Generic I/O, tag dictionary management, profile struct
  30
  31 // IOhandlers are abstractions used by littleCMS to read from whatever file, stream,
  32 // memory block or any storage. Each IOhandler provides implementations for read,
  33 // write, seek and tell functions. LittleCMS code deals with IO across those objects.
  34 // In this way, is easier to add support for new storage media.
  35
  36 // NULL stream, for taking care of used space -------------------------------------
  37
  38 // NULL IOhandler basically does nothing but keep track on how many bytes have been
  39 // written. This is handy when creating profiles, where the file size is needed in the
  40 // header. Then, whole profile is serialized across NULL IOhandler and a second pass
  41 // writes the bytes to the pertinent IOhandler.
  42
  43 typedef struct {
  44     cmsUInt32Number Pointer;         // Points to current location
  45 } FILENULL;
  46
  47 static
  48 cmsUInt32Number NULLRead(cmsIOHANDLER* iohandler, void *Buffer, cmsUInt32Number size, cmsUInt32Number count)
  49 {
  50     FILENULL* ResData = (FILENULL*) iohandler ->stream;
  51
  52     cmsUInt32Number len = size * count;
  53     ResData -> Pointer += len;
  54     return count;
  55
  56     cmsUNUSED_PARAMETER(Buffer);
  57 }
  58
  59 static
  60 cmsBool  NULLSeek(cmsIOHANDLER* iohandler, cmsUInt32Number offset)
  61 {
  62     FILENULL* ResData = (FILENULL*) iohandler ->stream;
  63
  64     ResData ->Pointer = offset;
  65     return TRUE;
  66 }
  67
  68 static
  69 cmsUInt32Number NULLTell(cmsIOHANDLER* iohandler)
  70 {
  71     FILENULL* ResData = (FILENULL*) iohandler ->stream;
  72     return ResData -> Pointer;
  73 }
  74
  75 static
  76 cmsBool  NULLWrite(cmsIOHANDLER* iohandler, cmsUInt32Number size, const void *Ptr)
  77 {
  78     FILENULL* ResData = (FILENULL*) iohandler ->stream;
  79
  80     ResData ->Pointer += size;
  81     if (ResData ->Pointer > iohandler->UsedSpace)
  82         iohandler->UsedSpace = ResData ->Pointer;
  83
  84     return TRUE;
  85
  86     cmsUNUSED_PARAMETER(Ptr);
  87 }
  88
  89 static
  90 cmsBool  NULLClose(cmsIOHANDLER* iohandler)
  91 {
  92     FILENULL* ResData = (FILENULL*) iohandler ->stream;
  93
  94     _cmsFree(iohandler ->ContextID, ResData);
  95     _cmsFree(iohandler ->ContextID, iohandler);
  96     return TRUE;
  97 }
  98
  99 // The NULL IOhandler creator
 100 cmsIOHANDLER*  CMSEXPORT cmsOpenIOhandlerFromNULL(cmsContext ContextID)
 101 {
 102     struct _cms_io_handler* iohandler = NULL;
 103     FILENULL* fm = NULL;
 104
 105     iohandler = (struct _cms_io_handler*) _cmsMallocZero(ContextID, sizeof(struct _cms_io_handler));
 106     if (iohandler == NULL) return NULL;
 107
 108     fm = (FILENULL*) _cmsMallocZero(ContextID, sizeof(FILENULL));
 109     if (fm == NULL) goto Error;
 110
 111     fm ->Pointer = 0;
 112
 113     iohandler ->ContextID = ContextID;
 114     iohandler ->stream  = (void*) fm;
 115     iohandler ->UsedSpace = 0;
 116     iohandler ->ReportedSize = 0;
 117     iohandler ->PhysicalFile[0] = 0;
 118
 119     iohandler ->Read    = NULLRead;
 120     iohandler ->Seek    = NULLSeek;
 121     iohandler ->Close   = NULLClose;
 122     iohandler ->Tell    = NULLTell;
 123     iohandler ->Write   = NULLWrite;
 124
 125     return iohandler;
 126
 127 Error:
 128     if (iohandler) _cmsFree(ContextID, iohandler);
 129     return NULL;
 130
 131 }
 132
 133
 134 // Memory-based stream --------------------------------------------------------------
 135
 136 // Those functions implements an iohandler which takes a block of memory as storage medium.
 137
 138 typedef struct {
 139     cmsUInt8Number* Block;    // Points to allocated memory
 140     cmsUInt32Number Size;     // Size of allocated memory
 141     cmsUInt32Number Pointer;  // Points to current location
 142     int FreeBlockOnClose;     // As title
 143
 144 } FILEMEM;
 145
 146 static
 147 cmsUInt32Number MemoryRead(struct _cms_io_handler* iohandler, void *Buffer, cmsUInt32Number size, cmsUInt32Number count)
 148 {
 149     FILEMEM* ResData = (FILEMEM*) iohandler ->stream;
 150     cmsUInt8Number* Ptr;
 151     cmsUInt32Number len = size * count;
 152
 153     if (ResData -> Pointer + len > ResData -> Size){
 154
 155         len = (ResData -> Size - ResData -> Pointer);
 156         cmsSignalError(iohandler ->ContextID, cmsERROR_READ, "Read from memory error. Got %d bytes, block should be of %d bytes", len, count * size);
 157         return 0;
 158     }
 159
 160     Ptr  = ResData -> Block;
 161     Ptr += ResData -> Pointer;
 162     memmove(Buffer, Ptr, len);
 163     ResData -> Pointer += len;
 164
 165     return count;
 166 }
 167
 168 // SEEK_CUR is assumed
 169 static
 170 cmsBool  MemorySeek(struct _cms_io_handler* iohandler, cmsUInt32Number offset)
 171 {
 172     FILEMEM* ResData = (FILEMEM*) iohandler ->stream;
 173
 174     if (offset > ResData ->Size) {
 175         cmsSignalError(iohandler ->ContextID, cmsERROR_SEEK,  "Too few data; probably corrupted profile");
 176         return FALSE;
 177     }
 178
 179     ResData ->Pointer = offset;
 180     return TRUE;
 181 }
 182
 183 // Tell for memory
 184 static
 185 cmsUInt32Number MemoryTell(struct _cms_io_handler* iohandler)
 186 {
 187     FILEMEM* ResData = (FILEMEM*) iohandler ->stream;
 188
 189     if (ResData == NULL) return 0;
 190     return ResData -> Pointer;
 191 }
 192
 193
 194 // Writes data to memory, also keeps used space for further reference.
 195 static
 196 cmsBool MemoryWrite(struct _cms_io_handler* iohandler, cmsUInt32Number size, const void *Ptr)
 197 {
 198     FILEMEM* ResData = (FILEMEM*) iohandler ->stream;
 199
 200     if (ResData == NULL) return FALSE; // Housekeeping
 201
 202     // Check for available space. Clip.
 203     if (ResData->Pointer + size > ResData->Size) {
 204         size = ResData ->Size - ResData->Pointer;
 205     }
 206
 207     if (size == 0) return TRUE;     // Write zero bytes is ok, but does nothing
 208
 209     memmove(ResData ->Block + ResData ->Pointer, Ptr, size);
 210     ResData ->Pointer += size;
 211
 212     if (ResData ->Pointer > iohandler->UsedSpace)
 213         iohandler->UsedSpace = ResData ->Pointer;
 214
 215     return TRUE;
 216 }
 217
 218
 219 static
 220 cmsBool  MemoryClose(struct _cms_io_handler* iohandler)
 221 {
 222     FILEMEM* ResData = (FILEMEM*) iohandler ->stream;
 223
 224     if (ResData ->FreeBlockOnClose) {
 225
 226         if (ResData ->Block) _cmsFree(iohandler ->ContextID, ResData ->Block);
 227     }
 228
 229     _cmsFree(iohandler ->ContextID, ResData);
 230     _cmsFree(iohandler ->ContextID, iohandler);
 231
 232     return TRUE;
 233 }
 234
 235 // Create a iohandler for memory block. AccessMode=='r' assumes the iohandler is going to read, and makes
 236 // a copy of the memory block for letting user to free the memory after invoking open profile. In write
 237 // mode ("w"), Buffer points to the begin of memory block to be written.
 238 cmsIOHANDLER* CMSEXPORT cmsOpenIOhandlerFromMem(cmsContext ContextID, void *Buffer, cmsUInt32Number size, const char* AccessMode)
 239 {
 240     cmsIOHANDLER* iohandler = NULL;
 241     FILEMEM* fm = NULL;
 242
 243     _cmsAssert(AccessMode != NULL);
 244
 245     iohandler = (cmsIOHANDLER*) _cmsMallocZero(ContextID, sizeof(cmsIOHANDLER));
 246     if (iohandler == NULL) return NULL;
 247
 248     switch (*AccessMode) {
 249
 250     case 'r':
 251         fm = (FILEMEM*) _cmsMallocZero(ContextID, sizeof(FILEMEM));
 252         if (fm == NULL) goto Error;
 253
 254         if (Buffer == NULL) {
 255             cmsSignalError(ContextID, cmsERROR_READ, "Couldn't read profile from NULL pointer");
 256             goto Error;
 257         }
 258
 259         fm ->Block = (cmsUInt8Number*) _cmsMalloc(ContextID, size);
 260         if (fm ->Block == NULL) {
 261
 262             _cmsFree(ContextID, fm);
 263             _cmsFree(ContextID, iohandler);
 264             cmsSignalError(ContextID, cmsERROR_READ, "Couldn't allocate %ld bytes for profile", (long) size);
 265             return NULL;
 266         }
 267
 268
 269         memmove(fm->Block, Buffer, size);
 270         fm ->FreeBlockOnClose = TRUE;
 271         fm ->Size    = size;
 272         fm ->Pointer = 0;
 273         iohandler -> ReportedSize = size;
 274         break;
 275
 276     case 'w':
 277         fm = (FILEMEM*) _cmsMallocZero(ContextID, sizeof(FILEMEM));
 278         if (fm == NULL) goto Error;
 279
 280         fm ->Block = (cmsUInt8Number*) Buffer;
 281         fm ->FreeBlockOnClose = FALSE;
 282         fm ->Size    = size;
 283         fm ->Pointer = 0;
 284         iohandler -> ReportedSize = 0;
 285         break;
 286
 287     default:
 288         cmsSignalError(ContextID, cmsERROR_UNKNOWN_EXTENSION, "Unknown access mode '%c'", *AccessMode);
 289         return NULL;
 290     }
 291
 292     iohandler ->ContextID = ContextID;
 293     iohandler ->stream  = (void*) fm;
 294     iohandler ->UsedSpace = 0;
 295     iohandler ->PhysicalFile[0] = 0;
 296
 297     iohandler ->Read    = MemoryRead;
 298     iohandler ->Seek    = MemorySeek;
 299     iohandler ->Close   = MemoryClose;
 300     iohandler ->Tell    = MemoryTell;
 301     iohandler ->Write   = MemoryWrite;
 302
 303     return iohandler;
 304
 305 Error:
 306     if (fm) _cmsFree(ContextID, fm);
 307     if (iohandler) _cmsFree(ContextID, iohandler);
 308     return NULL;
 309 }
 310
 311 // File-based stream -------------------------------------------------------
 312
 313 // Read count elements of size bytes each. Return number of elements read
 314 static
 315 cmsUInt32Number FileRead(cmsIOHANDLER* iohandler, void *Buffer, cmsUInt32Number size, cmsUInt32Number count)
 316 {
 317     cmsUInt32Number nReaded = (cmsUInt32Number) fread(Buffer, size, count, (FILE*) iohandler->stream);
 318
 319     if (nReaded != count) {
 320             cmsSignalError(iohandler ->ContextID, cmsERROR_FILE, "Read error. Got %d bytes, block should be of %d bytes", nReaded * size, count * size);
 321             return 0;
 322     }
 323
 324     return nReaded;
 325 }
 326
 327 // Position file pointer in the file
 328 static
 329 cmsBool  FileSeek(cmsIOHANDLER* iohandler, cmsUInt32Number offset)
 330 {
 331     if (fseek((FILE*) iohandler ->stream, (long) offset, SEEK_SET) != 0) {
 332
 333        cmsSignalError(iohandler ->ContextID, cmsERROR_FILE, "Seek error; probably corrupted file");
 334        return FALSE;
 335     }
 336
 337     return TRUE;
 338 }
 339
 340 // Returns file pointer position or 0 on error, which is also a valid position.
 341 static
 342 cmsUInt32Number FileTell(cmsIOHANDLER* iohandler)
 343 {
 344     long t = ftell((FILE*)iohandler ->stream);
 345     if (t == -1L) {
 346         cmsSignalError(iohandler->ContextID, cmsERROR_FILE, "Tell error; probably corrupted file");
 347         return 0;
 348     }
 349
 350     return (cmsUInt32Number)t;
 351 }
 352
 353 // Writes data to stream, also keeps used space for further reference. Returns TRUE on success, FALSE on error
 354 static
 355 cmsBool  FileWrite(cmsIOHANDLER* iohandler, cmsUInt32Number size, const void* Buffer)
 356 {
 357     if (size == 0) return TRUE;  // We allow to write 0 bytes, but nothing is written
 358
 359     iohandler->UsedSpace += size;
 360     return (fwrite(Buffer, size, 1, (FILE*)iohandler->stream) == 1);
 361 }
 362
 363 // Closes the file
 364 static
 365 cmsBool  FileClose(cmsIOHANDLER* iohandler)
 366 {
 367     if (fclose((FILE*) iohandler ->stream) != 0) return FALSE;
 368     _cmsFree(iohandler ->ContextID, iohandler);
 369     return TRUE;
 370 }
 371
 372 // Create a iohandler for disk based files.
 373 cmsIOHANDLER* CMSEXPORT cmsOpenIOhandlerFromFile(cmsContext ContextID, const char* FileName, const char* AccessMode)
 374 {
 375     cmsIOHANDLER* iohandler = NULL;
 376     FILE* fm = NULL;
 377     cmsInt32Number fileLen;
 378     char mode[4] = { 0,0,0,0 };
 379
 380     _cmsAssert(FileName != NULL);
 381     _cmsAssert(AccessMode != NULL);
 382
 383     iohandler = (cmsIOHANDLER*) _cmsMallocZero(ContextID, sizeof(cmsIOHANDLER));
 384     if (iohandler == NULL) return NULL;
 385
 386     // Validate access mode
 387     while (*AccessMode) {
 388
 389         switch (*AccessMode)
 390         {
 391         case 'r':
 392         case 'w':
 393
 394             if (mode[0] == 0) {
 395                 mode[0] = *AccessMode;
 396                 mode[1] = 'b';
 397             }
 398             else {
 399                 _cmsFree(ContextID, iohandler);
 400                 cmsSignalError(ContextID, cmsERROR_FILE, "Access mode already specified '%c'", *AccessMode);
 401                 return NULL;
 402             }
 403             break;
 404
 405         // Close on exec. Not all runtime supports that. Up to the caller to decide.
 406         case 'e':
 407             mode[2] = 'e';
 408             break;
 409
 410         default:
 411             _cmsFree(ContextID, iohandler);
 412             cmsSignalError(ContextID, cmsERROR_FILE, "Wrong access mode '%c'", *AccessMode);
 413             return NULL;
 414         }
 415
 416         AccessMode++;
 417     }
 418
 419     switch (mode[0]) {
 420
 421     case 'r':
 422         fm = fopen(FileName, mode);
 423         if (fm == NULL) {
 424             _cmsFree(ContextID, iohandler);
 425              cmsSignalError(ContextID, cmsERROR_FILE, "File '%s' not found", FileName);
 426             return NULL;
 427         }
 428         fileLen = (cmsInt32Number)cmsfilelength(fm);
 429         if (fileLen < 0)
 430         {
 431             fclose(fm);
 432             _cmsFree(ContextID, iohandler);
 433             cmsSignalError(ContextID, cmsERROR_FILE, "Cannot get size of file '%s'", FileName);
 434             return NULL;
 435         }
 436         iohandler -> ReportedSize = (cmsUInt32Number) fileLen;
 437         break;
 438
 439     case 'w':
 440         fm = fopen(FileName, mode);
 441         if (fm == NULL) {
 442             _cmsFree(ContextID, iohandler);
 443              cmsSignalError(ContextID, cmsERROR_FILE, "Couldn't create '%s'", FileName);
 444             return NULL;
 445         }
 446         iohandler -> ReportedSize = 0;
 447         break;
 448
 449     default:
 450         _cmsFree(ContextID, iohandler);   // Would never reach
 451         return NULL;
 452     }
 453
 454     iohandler ->ContextID = ContextID;
 455     iohandler ->stream = (void*) fm;
 456     iohandler ->UsedSpace = 0;
 457
 458     // Keep track of the original file
 459     strncpy(iohandler -> PhysicalFile, FileName, sizeof(iohandler -> PhysicalFile)-1);
 460     iohandler -> PhysicalFile[sizeof(iohandler -> PhysicalFile)-1] = 0;
 461
 462     iohandler ->Read    = FileRead;
 463     iohandler ->Seek    = FileSeek;
 464     iohandler ->Close   = FileClose;
 465     iohandler ->Tell    = FileTell;
 466     iohandler ->Write   = FileWrite;
 467
 468     return iohandler;
 469 }
 470
 471 // Create a iohandler for stream based files
 472 cmsIOHANDLER* CMSEXPORT cmsOpenIOhandlerFromStream(cmsContext ContextID, FILE* Stream)
 473 {
 474     cmsIOHANDLER* iohandler = NULL;
 475     cmsInt32Number fileSize;
 476
 477     fileSize = (cmsInt32Number)cmsfilelength(Stream);
 478     if (fileSize < 0)
 479     {
 480         cmsSignalError(ContextID, cmsERROR_FILE, "Cannot get size of stream");
 481         return NULL;
 482     }
 483
 484     iohandler = (cmsIOHANDLER*) _cmsMallocZero(ContextID, sizeof(cmsIOHANDLER));
 485     if (iohandler == NULL) return NULL;
 486
 487     iohandler -> ContextID = ContextID;
 488     iohandler -> stream = (void*) Stream;
 489     iohandler -> UsedSpace = 0;
 490     iohandler -> ReportedSize = (cmsUInt32Number) fileSize;
 491     iohandler -> PhysicalFile[0] = 0;
 492
 493     iohandler ->Read    = FileRead;
 494     iohandler ->Seek    = FileSeek;
 495     iohandler ->Close   = FileClose;
 496     iohandler ->Tell    = FileTell;
 497     iohandler ->Write   = FileWrite;
 498
 499     return iohandler;
 500 }
 501
 502
 503
 504 // Close an open IO handler
 505 cmsBool CMSEXPORT cmsCloseIOhandler(cmsIOHANDLER* io)
 506 {
 507     return io -> Close(io);
 508 }
 509
 510 // -------------------------------------------------------------------------------------------------------
 511
 512 cmsIOHANDLER* CMSEXPORT cmsGetProfileIOhandler(cmsHPROFILE hProfile)
 513 {
 514     _cmsICCPROFILE* Icc = (_cmsICCPROFILE*)hProfile;
 515
 516     if (Icc == NULL) return NULL;
 517     return Icc->IOhandler;
 518 }
 519
 520 // Creates an empty structure holding all required parameters
 521 cmsHPROFILE CMSEXPORT cmsCreateProfilePlaceholder(cmsContext ContextID)
 522 {
 523     _cmsICCPROFILE* Icc = (_cmsICCPROFILE*) _cmsMallocZero(ContextID, sizeof(_cmsICCPROFILE));
 524     if (Icc == NULL) return NULL;
 525
 526     Icc ->ContextID = ContextID;
 527
 528     // Set it to empty
 529     Icc -> TagCount   = 0;
 530
 531     // Set default version
 532     Icc ->Version =  0x02100000;
 533
 534     // Set default device class
 535     Icc->DeviceClass = cmsSigDisplayClass;
 536
 537     // Set creation date/time
 538     if (!_cmsGetTime(&Icc->Created))
 539         goto Error;
 540
 541     // Create a mutex if the user provided proper plugin. NULL otherwise
 542     Icc ->UsrMutex = _cmsCreateMutex(ContextID);
 543
 544     // Return the handle
 545     return (cmsHPROFILE) Icc;
 546
 547 Error:
 548     _cmsFree(ContextID, Icc);
 549     return NULL;
 550 }
 551
 552 cmsContext CMSEXPORT cmsGetProfileContextID(cmsHPROFILE hProfile)
 553 {
 554      _cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
 555
 556     if (Icc == NULL) return NULL;
 557     return Icc -> ContextID;
 558 }
 559
 560
 561 // Return the number of tags
 562 cmsInt32Number CMSEXPORT cmsGetTagCount(cmsHPROFILE hProfile)
 563 {
 564     _cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
 565     if (Icc == NULL) return -1;
 566
 567     return  (cmsInt32Number) Icc->TagCount;
 568 }
 569
 570 // Return the tag signature of a given tag number
 571 cmsTagSignature CMSEXPORT cmsGetTagSignature(cmsHPROFILE hProfile, cmsUInt32Number n)
 572 {
 573     _cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
 574
 575     if (n > Icc->TagCount) return (cmsTagSignature) 0;  // Mark as not available
 576     if (n >= MAX_TABLE_TAG) return (cmsTagSignature) 0; // As double check
 577
 578     return Icc ->TagNames[n];
 579 }
 580
 581
 582 static
 583 int SearchOneTag(_cmsICCPROFILE* Profile, cmsTagSignature sig)
 584 {
 585     int i;
 586
 587     for (i=0; i < (int) Profile -> TagCount; i++) {
 588
 589         if (sig == Profile -> TagNames[i])
 590             return i;
 591     }
 592
 593     return -1;
 594 }
 595
 596 // Search for a specific tag in tag dictionary. Returns position or -1 if tag not found.
 597 // If followlinks is turned on, then the position of the linked tag is returned
 598 int _cmsSearchTag(_cmsICCPROFILE* Icc, cmsTagSignature sig, cmsBool lFollowLinks)
 599 {
 600     int n;
 601     cmsTagSignature LinkedSig;
 602
 603     do {
 604
 605         // Search for given tag in ICC profile directory
 606         n = SearchOneTag(Icc, sig);
 607         if (n < 0)
 608             return -1;        // Not found
 609
 610         if (!lFollowLinks)
 611             return n;         // Found, don't follow links
 612
 613         // Is this a linked tag?
 614         LinkedSig = Icc ->TagLinked[n];
 615
 616         // Yes, follow link
 617         if (LinkedSig != (cmsTagSignature) 0) {
 618             sig = LinkedSig;
 619         }
 620
 621     } while (LinkedSig != (cmsTagSignature) 0);
 622
 623     return n;
 624 }
 625
 626 // Deletes a tag entry
 627
 628 static
 629 void _cmsDeleteTagByPos(_cmsICCPROFILE* Icc, int i)
 630 {
 631     _cmsAssert(Icc != NULL);
 632     _cmsAssert(i >= 0);
 633
 634
 635     if (Icc -> TagPtrs[i] != NULL) {
 636
 637         // Free previous version
 638         if (Icc ->TagSaveAsRaw[i]) {
 639             _cmsFree(Icc ->ContextID, Icc ->TagPtrs[i]);
 640         }
 641         else {
 642             cmsTagTypeHandler* TypeHandler = Icc ->TagTypeHandlers[i];
 643
 644             if (TypeHandler != NULL) {
 645
 646                 cmsTagTypeHandler LocalTypeHandler = *TypeHandler;
 647                 LocalTypeHandler.ContextID = Icc ->ContextID;              // As an additional parameter
 648                 LocalTypeHandler.ICCVersion = Icc ->Version;
 649                 LocalTypeHandler.FreePtr(&LocalTypeHandler, Icc -> TagPtrs[i]);
 650                 Icc ->TagPtrs[i] = NULL;
 651             }
 652         }
 653
 654     }
 655 }
 656
 657
 658 // Creates a new tag entry
 659 static
 660 cmsBool _cmsNewTag(_cmsICCPROFILE* Icc, cmsTagSignature sig, int* NewPos)
 661 {
 662     int i;
 663
 664     // Search for the tag
 665     i = _cmsSearchTag(Icc, sig, FALSE);
 666     if (i >= 0) {
 667
 668         // Already exists? delete it
 669         _cmsDeleteTagByPos(Icc, i);
 670         *NewPos = i;
 671     }
 672     else  {
 673
 674         // No, make a new one
 675         if (Icc -> TagCount >= MAX_TABLE_TAG) {
 676             cmsSignalError(Icc ->ContextID, cmsERROR_RANGE, "Too many tags (%d)", MAX_TABLE_TAG);
 677             return FALSE;
 678         }
 679
 680         *NewPos = (int) Icc ->TagCount;
 681         Icc -> TagCount++;
 682     }
 683
 684     return TRUE;
 685 }
 686
 687
 688 // Check existence
 689 cmsBool CMSEXPORT cmsIsTag(cmsHPROFILE hProfile, cmsTagSignature sig)
 690 {
 691        _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) (void*) hProfile;
 692        return _cmsSearchTag(Icc, sig, FALSE) >= 0;
 693 }
 694
 695
 696
 697 // Checks for link compatibility
 698 static
 699 cmsBool CompatibleTypes(const cmsTagDescriptor* desc1, const cmsTagDescriptor* desc2)
 700 {
 701     cmsUInt32Number i;
 702
 703     if (desc1 == NULL || desc2 == NULL) return FALSE;
 704
 705     if (desc1->nSupportedTypes != desc2->nSupportedTypes) return FALSE;
 706     if (desc1->ElemCount != desc2->ElemCount) return FALSE;
 707
 708     for (i = 0; i < desc1->nSupportedTypes; i++)
 709     {
 710         if (desc1->SupportedTypes[i] != desc2->SupportedTypes[i]) return FALSE;
 711     }
 712
 713     return TRUE;
 714 }
 715
 716 // Enforces that the profile version is per. spec.
 717 // Operates on the big endian bytes from the profile.
 718 // Called before converting to platform endianness.
 719 // Byte 0 is BCD major version, so max 9.
 720 // Byte 1 is 2 BCD digits, one per nibble.
 721 // Reserved bytes 2 & 3 must be 0.
 722 static
 723 cmsUInt32Number _validatedVersion(cmsUInt32Number DWord)
 724 {
 725     cmsUInt8Number* pByte = (cmsUInt8Number*) &DWord;
 726     cmsUInt8Number temp1;
 727     cmsUInt8Number temp2;
 728
 729     if (*pByte > 0x09) *pByte = (cmsUInt8Number) 0x09;
 730     temp1 = (cmsUInt8Number) (*(pByte+1) & 0xf0);
 731     temp2 = (cmsUInt8Number) (*(pByte+1) & 0x0f);
 732     if (temp1 > 0x90U) temp1 = 0x90U;
 733     if (temp2 > 0x09U) temp2 = 0x09U;
 734     *(pByte+1) = (cmsUInt8Number)(temp1 | temp2);
 735     *(pByte+2) = (cmsUInt8Number)0;
 736     *(pByte+3) = (cmsUInt8Number)0;
 737
 738     return DWord;
 739 }
 740
 741 // Check device class
 742 static
 743 cmsBool validDeviceClass(cmsProfileClassSignature cl)
 744 {
 745     if ((int)cl == 0) return TRUE; // We allow zero because older lcms versions defaulted to that.
 746
 747     switch (cl)
 748     {
 749     case cmsSigInputClass:
 750     case cmsSigDisplayClass:
 751     case cmsSigOutputClass:
 752     case cmsSigLinkClass:
 753     case cmsSigAbstractClass:
 754     case cmsSigColorSpaceClass:
 755     case cmsSigNamedColorClass:
 756         return TRUE;
 757
 758     default:
 759         return FALSE;
 760     }
 761
 762 }
 763
 764 // Read profile header and validate it
 765 cmsBool _cmsReadHeader(_cmsICCPROFILE* Icc)
 766 {
 767     cmsTagEntry Tag;
 768     cmsICCHeader Header;
 769     cmsUInt32Number i, j;
 770     cmsUInt32Number HeaderSize;
 771     cmsIOHANDLER* io = Icc ->IOhandler;
 772     cmsUInt32Number TagCount;
 773
 774
 775     // Read the header
 776     if (io -> Read(io, &Header, sizeof(cmsICCHeader), 1) != 1) {
 777         return FALSE;
 778     }
 779
 780     // Validate file as an ICC profile
 781     if (_cmsAdjustEndianess32(Header.magic) != cmsMagicNumber) {
 782         cmsSignalError(Icc ->ContextID, cmsERROR_BAD_SIGNATURE, "not an ICC profile, invalid signature");
 783         return FALSE;
 784     }
 785
 786     // Adjust endianness of the used parameters
 787     Icc -> DeviceClass     = (cmsProfileClassSignature) _cmsAdjustEndianess32(Header.deviceClass);
 788     Icc -> ColorSpace      = (cmsColorSpaceSignature)   _cmsAdjustEndianess32(Header.colorSpace);
 789     Icc -> PCS             = (cmsColorSpaceSignature)   _cmsAdjustEndianess32(Header.pcs);
 790
 791     Icc -> RenderingIntent = _cmsAdjustEndianess32(Header.renderingIntent);
 792     Icc -> flags           = _cmsAdjustEndianess32(Header.flags);
 793     Icc -> manufacturer    = _cmsAdjustEndianess32(Header.manufacturer);
 794     Icc -> model           = _cmsAdjustEndianess32(Header.model);
 795     Icc -> creator         = _cmsAdjustEndianess32(Header.creator);
 796
 797     _cmsAdjustEndianess64(&Icc -> attributes, &Header.attributes);
 798     Icc -> Version         = _cmsAdjustEndianess32(_validatedVersion(Header.version));
 799
 800     if (Icc->Version > 0x5000000) {
 801         cmsSignalError(Icc->ContextID, cmsERROR_UNKNOWN_EXTENSION, "Unsupported profile version '0x%x'", Icc->Version);
 802         return FALSE;
 803     }
 804
 805     if (!validDeviceClass(Icc->DeviceClass)) {
 806         cmsSignalError(Icc->ContextID, cmsERROR_UNKNOWN_EXTENSION, "Unsupported device class '0x%x'", Icc->DeviceClass);
 807         return FALSE;
 808     }
 809
 810     // Get size as reported in header
 811     HeaderSize = _cmsAdjustEndianess32(Header.size);
 812
 813     // Make sure HeaderSize is lower than profile size
 814     if (HeaderSize >= Icc ->IOhandler ->ReportedSize)
 815             HeaderSize = Icc ->IOhandler ->ReportedSize;
 816
 817
 818     // Get creation date/time
 819     _cmsDecodeDateTimeNumber(&Header.date, &Icc ->Created);
 820
 821     // The profile ID are 32 raw bytes
 822     memmove(Icc ->ProfileID.ID32, Header.profileID.ID32, 16);
 823
 824
 825     // Read tag directory
 826     if (!_cmsReadUInt32Number(io, &TagCount)) return FALSE;
 827     if (TagCount > MAX_TABLE_TAG) {
 828
 829         cmsSignalError(Icc ->ContextID, cmsERROR_RANGE, "Too many tags (%d)", TagCount);
 830         return FALSE;
 831     }
 832
 833
 834     // Read tag directory
 835     Icc -> TagCount = 0;
 836     for (i=0; i < TagCount; i++) {
 837
 838         if (!_cmsReadUInt32Number(io, (cmsUInt32Number *) &Tag.sig)) return FALSE;
 839         if (!_cmsReadUInt32Number(io, &Tag.offset)) return FALSE;
 840         if (!_cmsReadUInt32Number(io, &Tag.size)) return FALSE;
 841
 842         // Perform some sanity check. Offset + size should fall inside file.
 843         if (Tag.size == 0 || Tag.offset == 0) continue;
 844         if (Tag.offset + Tag.size > HeaderSize ||
 845             Tag.offset + Tag.size < Tag.offset)
 846                   continue;
 847
 848         Icc -> TagNames[Icc ->TagCount]   = Tag.sig;
 849         Icc -> TagOffsets[Icc ->TagCount] = Tag.offset;
 850         Icc -> TagSizes[Icc ->TagCount]   = Tag.size;
 851
 852        // Search for links
 853         for (j=0; j < Icc ->TagCount; j++) {
 854
 855             if ((Icc ->TagOffsets[j] == Tag.offset) &&
 856                 (Icc ->TagSizes[j]   == Tag.size)) {
 857
 858                 // Check types.
 859                 if (CompatibleTypes(_cmsGetTagDescriptor(Icc->ContextID, Icc->TagNames[j]),
 860                                     _cmsGetTagDescriptor(Icc->ContextID, Tag.sig))) {
 861
 862                     Icc->TagLinked[Icc->TagCount] = Icc->TagNames[j];
 863                 }
 864             }
 865
 866         }
 867
 868         Icc ->TagCount++;
 869     }
 870
 871
 872     for (i = 0; i < Icc->TagCount; i++) {
 873         for (j = 0; j < Icc->TagCount; j++) {
 874
 875             // Tags cannot be duplicate
 876             if ((i != j) && (Icc->TagNames[i] == Icc->TagNames[j])) {
 877                 cmsSignalError(Icc->ContextID, cmsERROR_RANGE, "Duplicate tag found");
 878                 return FALSE;
 879             }
 880
 881         }
 882     }
 883
 884     return TRUE;
 885 }
 886
 887 // Saves profile header
 888 cmsBool _cmsWriteHeader(_cmsICCPROFILE* Icc, cmsUInt32Number UsedSpace)
 889 {
 890     cmsICCHeader Header;
 891     cmsUInt32Number i;
 892     cmsTagEntry Tag;
 893     cmsUInt32Number Count;
 894
 895     Header.size        = _cmsAdjustEndianess32(UsedSpace);
 896     Header.cmmId       = _cmsAdjustEndianess32(lcmsSignature);
 897     Header.version     = _cmsAdjustEndianess32(Icc ->Version);
 898
 899     Header.deviceClass = (cmsProfileClassSignature) _cmsAdjustEndianess32(Icc -> DeviceClass);
 900     Header.colorSpace  = (cmsColorSpaceSignature) _cmsAdjustEndianess32(Icc -> ColorSpace);
 901     Header.pcs         = (cmsColorSpaceSignature) _cmsAdjustEndianess32(Icc -> PCS);
 902
 903     //   NOTE: in v4 Timestamp must be in UTC rather than in local time
 904     _cmsEncodeDateTimeNumber(&Header.date, &Icc ->Created);
 905
 906     Header.magic       = _cmsAdjustEndianess32(cmsMagicNumber);
 907
 908 #ifdef CMS_IS_WINDOWS_
 909     Header.platform    = (cmsPlatformSignature) _cmsAdjustEndianess32(cmsSigMicrosoft);
 910 #else
 911     Header.platform    = (cmsPlatformSignature) _cmsAdjustEndianess32(cmsSigMacintosh);
 912 #endif
 913
 914     Header.flags        = _cmsAdjustEndianess32(Icc -> flags);
 915     Header.manufacturer = _cmsAdjustEndianess32(Icc -> manufacturer);
 916     Header.model        = _cmsAdjustEndianess32(Icc -> model);
 917
 918     _cmsAdjustEndianess64(&Header.attributes, &Icc -> attributes);
 919
 920     // Rendering intent in the header (for embedded profiles)
 921     Header.renderingIntent = _cmsAdjustEndianess32(Icc -> RenderingIntent);
 922
 923     // Illuminant is always D50
 924     Header.illuminant.X = (cmsS15Fixed16Number) _cmsAdjustEndianess32((cmsUInt32Number) _cmsDoubleTo15Fixed16(cmsD50_XYZ()->X));
 925     Header.illuminant.Y = (cmsS15Fixed16Number) _cmsAdjustEndianess32((cmsUInt32Number) _cmsDoubleTo15Fixed16(cmsD50_XYZ()->Y));
 926     Header.illuminant.Z = (cmsS15Fixed16Number) _cmsAdjustEndianess32((cmsUInt32Number) _cmsDoubleTo15Fixed16(cmsD50_XYZ()->Z));
 927
 928     // Created by LittleCMS (that's me!)
 929     Header.creator      = _cmsAdjustEndianess32(lcmsSignature);
 930
 931     memset(&Header.reserved, 0, sizeof(Header.reserved));
 932
 933     // Set profile ID. Endianness is always big endian
 934     memmove(&Header.profileID, &Icc ->ProfileID, 16);
 935
 936     // Dump the header
 937     if (!Icc -> IOhandler->Write(Icc->IOhandler, sizeof(cmsICCHeader), &Header)) return FALSE;
 938
 939     // Saves Tag directory
 940
 941     // Get true count
 942     Count = 0;
 943     for (i=0;  i < Icc -> TagCount; i++) {
 944         if (Icc ->TagNames[i] != (cmsTagSignature) 0)
 945             Count++;
 946     }
 947
 948     // Store number of tags
 949     if (!_cmsWriteUInt32Number(Icc ->IOhandler, Count)) return FALSE;
 950
 951     for (i=0; i < Icc -> TagCount; i++) {
 952
 953         if (Icc ->TagNames[i] == (cmsTagSignature) 0) continue;   // It is just a placeholder
 954
 955         Tag.sig    = (cmsTagSignature) _cmsAdjustEndianess32((cmsUInt32Number) Icc -> TagNames[i]);
 956         Tag.offset = _cmsAdjustEndianess32((cmsUInt32Number) Icc -> TagOffsets[i]);
 957         Tag.size   = _cmsAdjustEndianess32((cmsUInt32Number) Icc -> TagSizes[i]);
 958
 959         if (!Icc ->IOhandler -> Write(Icc-> IOhandler, sizeof(cmsTagEntry), &Tag)) return FALSE;
 960     }
 961
 962     return TRUE;
 963 }
 964
 965 // ----------------------------------------------------------------------- Set/Get several struct members
 966
 967
 968 cmsUInt32Number CMSEXPORT cmsGetHeaderRenderingIntent(cmsHPROFILE hProfile)
 969 {
 970     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
 971     return Icc -> RenderingIntent;
 972 }
 973
 974 void CMSEXPORT cmsSetHeaderRenderingIntent(cmsHPROFILE hProfile, cmsUInt32Number RenderingIntent)
 975 {
 976     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
 977     Icc -> RenderingIntent = RenderingIntent;
 978 }
 979
 980 cmsUInt32Number CMSEXPORT cmsGetHeaderFlags(cmsHPROFILE hProfile)
 981 {
 982     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
 983     return (cmsUInt32Number) Icc -> flags;
 984 }
 985
 986 void CMSEXPORT cmsSetHeaderFlags(cmsHPROFILE hProfile, cmsUInt32Number Flags)
 987 {
 988     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
 989     Icc -> flags = (cmsUInt32Number) Flags;
 990 }
 991
 992 cmsUInt32Number CMSEXPORT cmsGetHeaderManufacturer(cmsHPROFILE hProfile)
 993 {
 994     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
 995     return Icc ->manufacturer;
 996 }
 997
 998 void CMSEXPORT cmsSetHeaderManufacturer(cmsHPROFILE hProfile, cmsUInt32Number manufacturer)
 999 {
1000     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
1001     Icc -> manufacturer = manufacturer;
1002 }
1003
1004 cmsUInt32Number CMSEXPORT cmsGetHeaderCreator(cmsHPROFILE hProfile)
1005 {
1006     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
1007     return Icc ->creator;
1008 }
1009
1010 cmsUInt32Number CMSEXPORT cmsGetHeaderModel(cmsHPROFILE hProfile)
1011 {
1012     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
1013     return Icc ->model;
1014 }
1015
1016 void CMSEXPORT cmsSetHeaderModel(cmsHPROFILE hProfile, cmsUInt32Number model)
1017 {
1018     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
1019     Icc -> model = model;
1020 }
1021
1022 void CMSEXPORT cmsGetHeaderAttributes(cmsHPROFILE hProfile, cmsUInt64Number* Flags)
1023 {
1024     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
1025     memmove(Flags, &Icc -> attributes, sizeof(cmsUInt64Number));
1026 }
1027
1028 void CMSEXPORT cmsSetHeaderAttributes(cmsHPROFILE hProfile, cmsUInt64Number Flags)
1029 {
1030     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
1031     memmove(&Icc -> attributes, &Flags, sizeof(cmsUInt64Number));
1032 }
1033
1034 void CMSEXPORT cmsGetHeaderProfileID(cmsHPROFILE hProfile, cmsUInt8Number* ProfileID)
1035 {
1036     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
1037     memmove(ProfileID, Icc ->ProfileID.ID8, 16);
1038 }
1039
1040 void CMSEXPORT cmsSetHeaderProfileID(cmsHPROFILE hProfile, cmsUInt8Number* ProfileID)
1041 {
1042     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
1043     memmove(&Icc -> ProfileID, ProfileID, 16);
1044 }
1045
1046 cmsBool  CMSEXPORT cmsGetHeaderCreationDateTime(cmsHPROFILE hProfile, struct tm *Dest)
1047 {
1048     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
1049     memmove(Dest, &Icc ->Created, sizeof(struct tm));
1050     return TRUE;
1051 }
1052
1053 cmsColorSpaceSignature CMSEXPORT cmsGetPCS(cmsHPROFILE hProfile)
1054 {
1055     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
1056     return Icc -> PCS;
1057 }
1058
1059 void CMSEXPORT cmsSetPCS(cmsHPROFILE hProfile, cmsColorSpaceSignature pcs)
1060 {
1061     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
1062     Icc -> PCS = pcs;
1063 }
1064
1065 cmsColorSpaceSignature CMSEXPORT cmsGetColorSpace(cmsHPROFILE hProfile)
1066 {
1067     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
1068     return Icc -> ColorSpace;
1069 }
1070
1071 void CMSEXPORT cmsSetColorSpace(cmsHPROFILE hProfile, cmsColorSpaceSignature sig)
1072 {
1073     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
1074     Icc -> ColorSpace = sig;
1075 }
1076
1077 cmsProfileClassSignature CMSEXPORT cmsGetDeviceClass(cmsHPROFILE hProfile)
1078 {
1079     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
1080     return Icc -> DeviceClass;
1081 }
1082
1083 void CMSEXPORT cmsSetDeviceClass(cmsHPROFILE hProfile, cmsProfileClassSignature sig)
1084 {
1085     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
1086     Icc -> DeviceClass = sig;
1087 }
1088
1089 cmsUInt32Number CMSEXPORT cmsGetEncodedICCversion(cmsHPROFILE hProfile)
1090 {
1091     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
1092     return Icc -> Version;
1093 }
1094
1095 void CMSEXPORT cmsSetEncodedICCversion(cmsHPROFILE hProfile, cmsUInt32Number Version)
1096 {
1097     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
1098     Icc -> Version = Version;
1099 }
1100
1101 // Get an hexadecimal number with same digits as v
1102 static
1103 cmsUInt32Number BaseToBase(cmsUInt32Number in, int BaseIn, int BaseOut)
1104 {
1105     char Buff[100];
1106     int i, len;
1107     cmsUInt32Number out;
1108
1109     for (len=0; in > 0 && len < 100; len++) {
1110
1111         Buff[len] = (char) (in % BaseIn);
1112         in /= BaseIn;
1113     }
1114
1115     for (i=len-1, out=0; i >= 0; --i) {
1116         out = out * BaseOut + Buff[i];
1117     }
1118
1119     return out;
1120 }
1121
1122 void  CMSEXPORT cmsSetProfileVersion(cmsHPROFILE hProfile, cmsFloat64Number Version)
1123 {
1124     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
1125
1126     // 4.2 -> 0x4200000
1127
1128     Icc -> Version = BaseToBase((cmsUInt32Number) floor(Version * 100.0 + 0.5), 10, 16) << 16;
1129 }
1130
1131 cmsFloat64Number CMSEXPORT cmsGetProfileVersion(cmsHPROFILE hProfile)
1132 {
1133     _cmsICCPROFILE*  Icc = (_cmsICCPROFILE*) hProfile;
1134     cmsUInt32Number n = Icc -> Version >> 16;
1135
1136     return BaseToBase(n, 16, 10) / 100.0;
1137 }
1138 // --------------------------------------------------------------------------------------------------------------
1139
1140
1141 // Create profile from IOhandler
1142 cmsHPROFILE CMSEXPORT cmsOpenProfileFromIOhandlerTHR(cmsContext ContextID, cmsIOHANDLER* io)
1143 {
1144     _cmsICCPROFILE* NewIcc;
1145     cmsHPROFILE hEmpty = cmsCreateProfilePlaceholder(ContextID);
1146
1147     if (hEmpty == NULL) return NULL;
1148
1149     NewIcc = (_cmsICCPROFILE*) hEmpty;
1150
1151     NewIcc ->IOhandler = io;
1152     if (!_cmsReadHeader(NewIcc)) goto Error;
1153     return hEmpty;
1154
1155 Error:
1156     cmsCloseProfile(hEmpty);
1157     return NULL;
1158 }
1159
1160 // Create profile from IOhandler
1161 cmsHPROFILE CMSEXPORT cmsOpenProfileFromIOhandler2THR(cmsContext ContextID, cmsIOHANDLER* io, cmsBool write)
1162 {
1163     _cmsICCPROFILE* NewIcc;
1164     cmsHPROFILE hEmpty = cmsCreateProfilePlaceholder(ContextID);
1165
1166     if (hEmpty == NULL) return NULL;
1167
1168     NewIcc = (_cmsICCPROFILE*) hEmpty;
1169
1170     NewIcc ->IOhandler = io;
1171     if (write) {
1172
1173         NewIcc -> IsWrite = TRUE;
1174         return hEmpty;
1175     }
1176
1177     if (!_cmsReadHeader(NewIcc)) goto Error;
1178     return hEmpty;
1179
1180 Error:
1181     cmsCloseProfile(hEmpty);
1182     return NULL;
1183 }
1184
1185
1186 // Create profile from disk file
1187 cmsHPROFILE CMSEXPORT cmsOpenProfileFromFileTHR(cmsContext ContextID, const char *lpFileName, const char *sAccess)
1188 {
1189     _cmsICCPROFILE* NewIcc;
1190     cmsHPROFILE hEmpty = cmsCreateProfilePlaceholder(ContextID);
1191
1192     if (hEmpty == NULL) return NULL;
1193
1194     NewIcc = (_cmsICCPROFILE*) hEmpty;
1195
1196     NewIcc ->IOhandler = cmsOpenIOhandlerFromFile(ContextID, lpFileName, sAccess);
1197     if (NewIcc ->IOhandler == NULL) goto Error;
1198
1199     if (*sAccess == 'W' || *sAccess == 'w') {
1200
1201         NewIcc -> IsWrite = TRUE;
1202
1203         return hEmpty;
1204     }
1205
1206     if (!_cmsReadHeader(NewIcc)) goto Error;
1207     return hEmpty;
1208
1209 Error:
1210     cmsCloseProfile(hEmpty);
1211     return NULL;
1212 }
1213
1214
1215 cmsHPROFILE CMSEXPORT cmsOpenProfileFromFile(const char *ICCProfile, const char *sAccess)
1216 {
1217     return cmsOpenProfileFromFileTHR(NULL, ICCProfile, sAccess);
1218 }
1219
1220
1221 cmsHPROFILE  CMSEXPORT cmsOpenProfileFromStreamTHR(cmsContext ContextID, FILE* ICCProfile, const char *sAccess)
1222 {
1223     _cmsICCPROFILE* NewIcc;
1224     cmsHPROFILE hEmpty = cmsCreateProfilePlaceholder(ContextID);
1225
1226     if (hEmpty == NULL) return NULL;
1227
1228     NewIcc = (_cmsICCPROFILE*) hEmpty;
1229
1230     NewIcc ->IOhandler = cmsOpenIOhandlerFromStream(ContextID, ICCProfile);
1231     if (NewIcc ->IOhandler == NULL) goto Error;
1232
1233     if (*sAccess == 'w') {
1234
1235         NewIcc -> IsWrite = TRUE;
1236         return hEmpty;
1237     }
1238
1239     if (!_cmsReadHeader(NewIcc)) goto Error;
1240     return hEmpty;
1241
1242 Error:
1243     cmsCloseProfile(hEmpty);
1244     return NULL;
1245
1246 }
1247
1248 cmsHPROFILE  CMSEXPORT cmsOpenProfileFromStream(FILE* ICCProfile, const char *sAccess)
1249 {
1250     return cmsOpenProfileFromStreamTHR(NULL, ICCProfile, sAccess);
1251 }
1252
1253
1254 // Open from memory block
1255 cmsHPROFILE CMSEXPORT cmsOpenProfileFromMemTHR(cmsContext ContextID, const void* MemPtr, cmsUInt32Number dwSize)
1256 {
1257     _cmsICCPROFILE* NewIcc;
1258     cmsHPROFILE hEmpty;
1259
1260     hEmpty = cmsCreateProfilePlaceholder(ContextID);
1261     if (hEmpty == NULL) return NULL;
1262
1263     NewIcc = (_cmsICCPROFILE*) hEmpty;
1264
1265     // Ok, in this case const void* is casted to void* just because open IO handler
1266     // shares read and writing modes. Don't abuse this feature!
1267     NewIcc ->IOhandler = cmsOpenIOhandlerFromMem(ContextID, (void*) MemPtr, dwSize, "r");
1268     if (NewIcc ->IOhandler == NULL) goto Error;
1269
1270     if (!_cmsReadHeader(NewIcc)) goto Error;
1271
1272     return hEmpty;
1273
1274 Error:
1275     cmsCloseProfile(hEmpty);
1276     return NULL;
1277 }
1278
1279 cmsHPROFILE CMSEXPORT cmsOpenProfileFromMem(const void* MemPtr, cmsUInt32Number dwSize)
1280 {
1281     return cmsOpenProfileFromMemTHR(NULL, MemPtr, dwSize);
1282 }
1283
1284
1285
1286 // Dump tag contents. If the profile is being modified, untouched tags are copied from FileOrig
1287 static
1288 cmsBool SaveTags(_cmsICCPROFILE* Icc, _cmsICCPROFILE* FileOrig)
1289 {
1290     cmsUInt8Number* Data;
1291     cmsUInt32Number i;
1292     cmsUInt32Number Begin;
1293     cmsIOHANDLER* io = Icc ->IOhandler;
1294     cmsTagDescriptor* TagDescriptor;
1295     cmsTagTypeSignature TypeBase;
1296     cmsTagTypeSignature Type;
1297     cmsTagTypeHandler* TypeHandler;
1298     cmsFloat64Number   Version = cmsGetProfileVersion((cmsHPROFILE) Icc);
1299     cmsTagTypeHandler LocalTypeHandler;
1300
1301     for (i=0; i < Icc -> TagCount; i++) {
1302
1303         if (Icc ->TagNames[i] == (cmsTagSignature) 0) continue;
1304
1305         // Linked tags are not written
1306         if (Icc ->TagLinked[i] != (cmsTagSignature) 0) continue;
1307
1308         Icc -> TagOffsets[i] = Begin = io ->UsedSpace;
1309
1310         Data = (cmsUInt8Number*)  Icc -> TagPtrs[i];
1311
1312         if (!Data) {
1313
1314             // Reach here if we are copying a tag from a disk-based ICC profile which has not been modified by user.
1315             // In this case a blind copy of the block data is performed
1316             if (FileOrig != NULL && Icc -> TagOffsets[i]) {
1317
1318                 if (FileOrig->IOhandler != NULL)
1319                 {
1320                     cmsUInt32Number TagSize = FileOrig->TagSizes[i];
1321                     cmsUInt32Number TagOffset = FileOrig->TagOffsets[i];
1322                     void* Mem;
1323
1324                     if (!FileOrig->IOhandler->Seek(FileOrig->IOhandler, TagOffset)) return FALSE;
1325
1326                     Mem = _cmsMalloc(Icc->ContextID, TagSize);
1327                     if (Mem == NULL) return FALSE;
1328
1329                     if (FileOrig->IOhandler->Read(FileOrig->IOhandler, Mem, TagSize, 1) != 1) return FALSE;
1330                     if (!io->Write(io, TagSize, Mem)) return FALSE;
1331                     _cmsFree(Icc->ContextID, Mem);
1332
1333                     Icc->TagSizes[i] = (io->UsedSpace - Begin);
1334
1335
1336                     // Align to 32 bit boundary.
1337                     if (!_cmsWriteAlignment(io))
1338                         return FALSE;
1339                 }
1340             }
1341
1342             continue;
1343         }
1344
1345
1346         // Should this tag be saved as RAW? If so, tagsizes should be specified in advance (no further cooking is done)
1347         if (Icc ->TagSaveAsRaw[i]) {
1348
1349             if (io -> Write(io, Icc ->TagSizes[i], Data) != 1) return FALSE;
1350         }
1351         else {
1352
1353             // Search for support on this tag
1354             TagDescriptor = _cmsGetTagDescriptor(Icc-> ContextID, Icc -> TagNames[i]);
1355             if (TagDescriptor == NULL) continue;                        // Unsupported, ignore it
1356
1357             if (TagDescriptor ->DecideType != NULL) {
1358
1359                 Type = TagDescriptor ->DecideType(Version, Data);
1360             }
1361             else {
1362
1363                 Type = TagDescriptor ->SupportedTypes[0];
1364             }
1365
1366             TypeHandler =  _cmsGetTagTypeHandler(Icc->ContextID, Type);
1367
1368             if (TypeHandler == NULL) {
1369                 cmsSignalError(Icc ->ContextID, cmsERROR_INTERNAL, "(Internal) no handler for tag %x", Icc -> TagNames[i]);
1370                 continue;
1371             }
1372
1373             TypeBase = TypeHandler ->Signature;
1374             if (!_cmsWriteTypeBase(io, TypeBase))
1375                 return FALSE;
1376
1377             LocalTypeHandler = *TypeHandler;
1378             LocalTypeHandler.ContextID  = Icc ->ContextID;
1379             LocalTypeHandler.ICCVersion = Icc ->Version;
1380             if (!LocalTypeHandler.WritePtr(&LocalTypeHandler, io, Data, TagDescriptor ->ElemCount)) {
1381
1382                 char String[5];
1383
1384                 _cmsTagSignature2String(String, (cmsTagSignature) TypeBase);
1385                 cmsSignalError(Icc ->ContextID, cmsERROR_WRITE, "Couldn't write type '%s'", String);
1386                 return FALSE;
1387             }
1388         }
1389
1390
1391         Icc -> TagSizes[i] = (io ->UsedSpace - Begin);
1392
1393         // Align to 32 bit boundary.
1394         if (! _cmsWriteAlignment(io))
1395             return FALSE;
1396     }
1397
1398
1399     return TRUE;
1400 }
1401
1402
1403 // Fill the offset and size fields for all linked tags
1404 static
1405 cmsBool SetLinks( _cmsICCPROFILE* Icc)
1406 {
1407     cmsUInt32Number i;
1408
1409     for (i=0; i < Icc -> TagCount; i++) {
1410
1411         cmsTagSignature lnk = Icc ->TagLinked[i];
1412         if (lnk != (cmsTagSignature) 0) {
1413
1414             int j = _cmsSearchTag(Icc, lnk, FALSE);
1415             if (j >= 0) {
1416
1417                 Icc ->TagOffsets[i] = Icc ->TagOffsets[j];
1418                 Icc ->TagSizes[i]   = Icc ->TagSizes[j];
1419             }
1420
1421         }
1422     }
1423
1424     return TRUE;
1425 }
1426
1427 // Low-level save to IOHANDLER. It returns the number of bytes used to
1428 // store the profile, or zero on error. io may be NULL and in this case
1429 // no data is written--only sizes are calculated
1430 cmsUInt32Number CMSEXPORT cmsSaveProfileToIOhandler(cmsHPROFILE hProfile, cmsIOHANDLER* io)
1431 {
1432     _cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
1433     _cmsICCPROFILE Keep;
1434     cmsIOHANDLER* PrevIO = NULL;
1435     cmsUInt32Number UsedSpace;
1436     cmsContext ContextID;
1437
1438     _cmsAssert(hProfile != NULL);
1439
1440     if (!_cmsLockMutex(Icc->ContextID, Icc->UsrMutex)) return 0;
1441     memmove(&Keep, Icc, sizeof(_cmsICCPROFILE));
1442
1443     ContextID = cmsGetProfileContextID(hProfile);
1444     PrevIO = Icc ->IOhandler = cmsOpenIOhandlerFromNULL(ContextID);
1445     if (PrevIO == NULL) {
1446         _cmsUnlockMutex(Icc->ContextID, Icc->UsrMutex);
1447         return 0;
1448     }
1449
1450     // Pass #1 does compute offsets
1451
1452     if (!_cmsWriteHeader(Icc, 0)) goto Error;
1453     if (!SaveTags(Icc, &Keep)) goto Error;
1454
1455     UsedSpace = PrevIO ->UsedSpace;
1456
1457     // Pass #2 does save to iohandler
1458
1459     if (io != NULL) {
1460
1461         Icc ->IOhandler = io;
1462         if (!SetLinks(Icc)) goto Error;
1463         if (!_cmsWriteHeader(Icc, UsedSpace)) goto Error;
1464         if (!SaveTags(Icc, &Keep)) goto Error;
1465     }
1466
1467     memmove(Icc, &Keep, sizeof(_cmsICCPROFILE));
1468     if (!cmsCloseIOhandler(PrevIO))
1469         UsedSpace = 0; // As a error marker
1470
1471     _cmsUnlockMutex(Icc->ContextID, Icc->UsrMutex);
1472
1473     return UsedSpace;
1474
1475
1476 Error:
1477     cmsCloseIOhandler(PrevIO);
1478     memmove(Icc, &Keep, sizeof(_cmsICCPROFILE));
1479     _cmsUnlockMutex(Icc->ContextID, Icc->UsrMutex);
1480
1481     return 0;
1482 }
1483
1484
1485 // Low-level save to disk.
1486 cmsBool  CMSEXPORT cmsSaveProfileToFile(cmsHPROFILE hProfile, const char* FileName)
1487 {
1488     cmsContext ContextID = cmsGetProfileContextID(hProfile);
1489     cmsIOHANDLER* io = cmsOpenIOhandlerFromFile(ContextID, FileName, "w");
1490     cmsBool rc;
1491
1492     if (io == NULL) return FALSE;
1493
1494     rc = (cmsSaveProfileToIOhandler(hProfile, io) != 0);
1495     rc &= cmsCloseIOhandler(io);
1496
1497     if (rc == FALSE) {          // remove() is C99 per 7.19.4.1
1498             remove(FileName);   // We have to IGNORE return value in this case
1499     }
1500     return rc;
1501 }
1502
1503 // Same as anterior, but for streams
1504 cmsBool CMSEXPORT cmsSaveProfileToStream(cmsHPROFILE hProfile, FILE* Stream)
1505 {
1506     cmsBool rc;
1507     cmsContext ContextID = cmsGetProfileContextID(hProfile);
1508     cmsIOHANDLER* io = cmsOpenIOhandlerFromStream(ContextID, Stream);
1509
1510     if (io == NULL) return FALSE;
1511
1512     rc = (cmsSaveProfileToIOhandler(hProfile, io) != 0);
1513     rc &= cmsCloseIOhandler(io);
1514
1515     return rc;
1516 }
1517
1518
1519 // Same as anterior, but for memory blocks. In this case, a NULL as MemPtr means calculate needed space only
1520 cmsBool CMSEXPORT cmsSaveProfileToMem(cmsHPROFILE hProfile, void *MemPtr, cmsUInt32Number* BytesNeeded)
1521 {
1522     cmsBool rc;
1523     cmsIOHANDLER* io;
1524     cmsContext ContextID = cmsGetProfileContextID(hProfile);
1525
1526     _cmsAssert(BytesNeeded != NULL);
1527
1528     // Should we just calculate the needed space?
1529     if (MemPtr == NULL) {
1530
1531            *BytesNeeded =  cmsSaveProfileToIOhandler(hProfile, NULL);
1532             return (*BytesNeeded == 0) ? FALSE : TRUE;
1533     }
1534
1535     // That is a real write operation
1536     io =  cmsOpenIOhandlerFromMem(ContextID, MemPtr, *BytesNeeded, "w");
1537     if (io == NULL) return FALSE;
1538
1539     rc = (cmsSaveProfileToIOhandler(hProfile, io) != 0);
1540     rc &= cmsCloseIOhandler(io);
1541
1542     return rc;
1543 }
1544
1545 // Free one tag contents
1546 static
1547 void freeOneTag(_cmsICCPROFILE* Icc, cmsUInt32Number i)
1548 {
1549     if (Icc->TagPtrs[i]) {
1550
1551         cmsTagTypeHandler* TypeHandler = Icc->TagTypeHandlers[i];
1552
1553         if (TypeHandler != NULL) {
1554             cmsTagTypeHandler LocalTypeHandler = *TypeHandler;
1555
1556             LocalTypeHandler.ContextID = Icc->ContextID;
1557             LocalTypeHandler.ICCVersion = Icc->Version;
1558             LocalTypeHandler.FreePtr(&LocalTypeHandler, Icc->TagPtrs[i]);
1559         }
1560         else
1561             _cmsFree(Icc->ContextID, Icc->TagPtrs[i]);
1562     }
1563 }
1564
1565 // Closes a profile freeing any involved resources
1566 cmsBool  CMSEXPORT cmsCloseProfile(cmsHPROFILE hProfile)
1567 {
1568     _cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
1569     cmsBool  rc = TRUE;
1570     cmsUInt32Number i;
1571
1572     if (!Icc) return FALSE;
1573
1574     // Was open in write mode?
1575     if (Icc ->IsWrite) {
1576
1577         Icc ->IsWrite = FALSE;      // Assure no further writing
1578         rc &= cmsSaveProfileToFile(hProfile, Icc ->IOhandler->PhysicalFile);
1579     }
1580
1581     for (i=0; i < Icc -> TagCount; i++) {
1582
1583         freeOneTag(Icc, i);
1584     }
1585
1586     if (Icc ->IOhandler != NULL) {
1587         rc &= cmsCloseIOhandler(Icc->IOhandler);
1588     }
1589
1590     _cmsDestroyMutex(Icc->ContextID, Icc->UsrMutex);
1591
1592     _cmsFree(Icc ->ContextID, Icc);   // Free placeholder memory
1593
1594     return rc;
1595 }
1596
1597
1598 // -------------------------------------------------------------------------------------------------------------------
1599
1600
1601 // Returns TRUE if a given tag is supported by a plug-in
1602 static
1603 cmsBool IsTypeSupported(cmsTagDescriptor* TagDescriptor, cmsTagTypeSignature Type)
1604 {
1605     cmsUInt32Number i, nMaxTypes;
1606
1607     nMaxTypes = TagDescriptor->nSupportedTypes;
1608     if (nMaxTypes >= MAX_TYPES_IN_LCMS_PLUGIN)
1609         nMaxTypes = MAX_TYPES_IN_LCMS_PLUGIN;
1610
1611     for (i=0; i < nMaxTypes; i++) {
1612         if (Type == TagDescriptor ->SupportedTypes[i]) return TRUE;
1613     }
1614
1615     return FALSE;
1616 }
1617
1618
1619 // That's the main read function
1620 void* CMSEXPORT cmsReadTag(cmsHPROFILE hProfile, cmsTagSignature sig)
1621 {
1622     _cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
1623     cmsIOHANDLER* io;
1624     cmsTagTypeHandler* TypeHandler;
1625     cmsTagTypeHandler LocalTypeHandler;
1626     cmsTagDescriptor*  TagDescriptor;
1627     cmsTagTypeSignature BaseType;
1628     cmsUInt32Number Offset, TagSize;
1629     cmsUInt32Number ElemCount;
1630     int n;
1631
1632     if (!_cmsLockMutex(Icc->ContextID, Icc ->UsrMutex)) return NULL;
1633
1634     n = _cmsSearchTag(Icc, sig, TRUE);
1635     if (n < 0)
1636     {
1637         // Not found, return NULL
1638         _cmsUnlockMutex(Icc->ContextID, Icc->UsrMutex);
1639         return NULL;
1640     }
1641
1642     // If the element is already in memory, return the pointer
1643     if (Icc -> TagPtrs[n]) {
1644
1645         if (Icc->TagTypeHandlers[n] == NULL) goto Error;
1646
1647         // Sanity check
1648         BaseType = Icc->TagTypeHandlers[n]->Signature;
1649         if (BaseType == 0) goto Error;
1650
1651         TagDescriptor = _cmsGetTagDescriptor(Icc->ContextID, sig);
1652         if (TagDescriptor == NULL) goto Error;
1653
1654         if (!IsTypeSupported(TagDescriptor, BaseType)) goto Error;
1655
1656         if (Icc ->TagSaveAsRaw[n]) goto Error;  // We don't support read raw tags as cooked
1657
1658         _cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex);
1659         return Icc -> TagPtrs[n];
1660     }
1661
1662     // We need to read it. Get the offset and size to the file
1663     Offset    = Icc -> TagOffsets[n];
1664     TagSize   = Icc -> TagSizes[n];
1665
1666     if (TagSize < 8) goto Error;
1667
1668     io = Icc ->IOhandler;
1669
1670     if (io == NULL) { // This is a built-in profile that has been manipulated, abort early
1671
1672         cmsSignalError(Icc->ContextID, cmsERROR_CORRUPTION_DETECTED, "Corrupted built-in profile.");
1673         goto Error;
1674     }
1675
1676     // Seek to its location
1677     if (!io -> Seek(io, Offset))
1678         goto Error;
1679
1680     // Search for support on this tag
1681     TagDescriptor = _cmsGetTagDescriptor(Icc-> ContextID, sig);
1682     if (TagDescriptor == NULL) {
1683
1684         char String[5];
1685
1686         _cmsTagSignature2String(String, sig);
1687
1688         // An unknown element was found.
1689         cmsSignalError(Icc ->ContextID, cmsERROR_UNKNOWN_EXTENSION, "Unknown tag type '%s' found.", String);
1690         goto Error;     // Unsupported.
1691     }
1692
1693     // if supported, get type and check if in list
1694     BaseType = _cmsReadTypeBase(io);
1695     if (BaseType == 0) goto Error;
1696
1697     if (!IsTypeSupported(TagDescriptor, BaseType)) goto Error;
1698
1699     TagSize  -= 8;       // Already read by the type base logic
1700
1701     // Get type handler
1702     TypeHandler = _cmsGetTagTypeHandler(Icc ->ContextID, BaseType);
1703     if (TypeHandler == NULL) goto Error;
1704     LocalTypeHandler = *TypeHandler;
1705
1706
1707     // Read the tag
1708     Icc -> TagTypeHandlers[n] = TypeHandler;
1709
1710     LocalTypeHandler.ContextID = Icc ->ContextID;
1711     LocalTypeHandler.ICCVersion = Icc ->Version;
1712     Icc -> TagPtrs[n] = LocalTypeHandler.ReadPtr(&LocalTypeHandler, io, &ElemCount, TagSize);
1713
1714     // The tag type is supported, but something wrong happened and we cannot read the tag.
1715     // let know the user about this (although it is just a warning)
1716     if (Icc -> TagPtrs[n] == NULL) {
1717
1718         char String[5];
1719
1720         _cmsTagSignature2String(String, sig);
1721         cmsSignalError(Icc ->ContextID, cmsERROR_CORRUPTION_DETECTED, "Corrupted tag '%s'", String);
1722         goto Error;
1723     }
1724
1725     // This is a weird error that may be a symptom of something more serious, the number of
1726     // stored item is actually less than the number of required elements.
1727     if (ElemCount < TagDescriptor ->ElemCount) {
1728
1729         char String[5];
1730
1731         _cmsTagSignature2String(String, sig);
1732         cmsSignalError(Icc ->ContextID, cmsERROR_CORRUPTION_DETECTED, "'%s' Inconsistent number of items: expected %d, got %d",
1733             String, TagDescriptor ->ElemCount, ElemCount);
1734         goto Error;
1735     }
1736
1737
1738     // Return the data
1739     _cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex);
1740     return Icc -> TagPtrs[n];
1741
1742
1743     // Return error and unlock the data
1744 Error:
1745
1746     freeOneTag(Icc, n);
1747     Icc->TagPtrs[n] = NULL;
1748
1749     _cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex);
1750     return NULL;
1751 }
1752
1753
1754 // Get true type of data
1755 cmsTagTypeSignature _cmsGetTagTrueType(cmsHPROFILE hProfile, cmsTagSignature sig)
1756 {
1757     _cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
1758     cmsTagTypeHandler* TypeHandler;
1759     int n;
1760
1761     // Search for given tag in ICC profile directory
1762     n = _cmsSearchTag(Icc, sig, TRUE);
1763     if (n < 0) return (cmsTagTypeSignature) 0;                // Not found, return NULL
1764
1765     // Get the handler. The true type is there
1766     TypeHandler =  Icc -> TagTypeHandlers[n];
1767     return TypeHandler ->Signature;
1768 }
1769
1770
1771 // Write a single tag. This just keeps track of the tak into a list of "to be written". If the tag is already
1772 // in that list, the previous version is deleted.
1773 cmsBool CMSEXPORT cmsWriteTag(cmsHPROFILE hProfile, cmsTagSignature sig, const void* data)
1774 {
1775     _cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
1776     cmsTagTypeHandler* TypeHandler = NULL;
1777     cmsTagTypeHandler LocalTypeHandler;
1778     cmsTagDescriptor* TagDescriptor = NULL;
1779     cmsTagTypeSignature Type;
1780     int i;
1781     cmsFloat64Number Version;
1782     char TypeString[5], SigString[5];
1783
1784     if (!_cmsLockMutex(Icc->ContextID, Icc ->UsrMutex)) return FALSE;
1785
1786     // To delete tags.
1787     if (data == NULL) {
1788
1789          // Delete the tag
1790          i = _cmsSearchTag(Icc, sig, FALSE);
1791          if (i >= 0) {
1792
1793              // Use zero as a mark of deleted
1794              _cmsDeleteTagByPos(Icc, i);
1795              Icc ->TagNames[i] = (cmsTagSignature) 0;
1796              _cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex);
1797              return TRUE;
1798          }
1799          // Didn't find the tag
1800         goto Error;
1801     }
1802
1803     if (!_cmsNewTag(Icc, sig, &i)) goto Error;
1804
1805     // This is not raw
1806     Icc ->TagSaveAsRaw[i] = FALSE;
1807
1808     // This is not a link
1809     Icc ->TagLinked[i] = (cmsTagSignature) 0;
1810
1811     // Get information about the TAG.
1812     TagDescriptor = _cmsGetTagDescriptor(Icc-> ContextID, sig);
1813     if (TagDescriptor == NULL){
1814          cmsSignalError(Icc ->ContextID, cmsERROR_UNKNOWN_EXTENSION, "Unsupported tag '%x'", sig);
1815         goto Error;
1816     }
1817
1818
1819     // Now we need to know which type to use. It depends on the version.
1820     Version = cmsGetProfileVersion(hProfile);
1821
1822     if (TagDescriptor ->DecideType != NULL) {
1823
1824         // Let the tag descriptor to decide the type base on depending on
1825         // the data. This is useful for example on parametric curves, where
1826         // curves specified by a table cannot be saved as parametric and needs
1827         // to be casted to single v2-curves, even on v4 profiles.
1828
1829         Type = TagDescriptor ->DecideType(Version, data);
1830     }
1831     else {
1832
1833         Type = TagDescriptor ->SupportedTypes[0];
1834     }
1835
1836     // Does the tag support this type?
1837     if (!IsTypeSupported(TagDescriptor, Type)) {
1838
1839         _cmsTagSignature2String(TypeString, (cmsTagSignature) Type);
1840         _cmsTagSignature2String(SigString,  sig);
1841
1842         cmsSignalError(Icc ->ContextID, cmsERROR_UNKNOWN_EXTENSION, "Unsupported type '%s' for tag '%s'", TypeString, SigString);
1843         goto Error;
1844     }
1845
1846     // Does we have a handler for this type?
1847     TypeHandler =  _cmsGetTagTypeHandler(Icc->ContextID, Type);
1848     if (TypeHandler == NULL) {
1849
1850         _cmsTagSignature2String(TypeString, (cmsTagSignature) Type);
1851         _cmsTagSignature2String(SigString,  sig);
1852
1853         cmsSignalError(Icc ->ContextID, cmsERROR_UNKNOWN_EXTENSION, "Unsupported type '%s' for tag '%s'", TypeString, SigString);
1854         goto Error;           // Should never happen
1855     }
1856
1857
1858     // Fill fields on icc structure
1859     Icc ->TagTypeHandlers[i]  = TypeHandler;
1860     Icc ->TagNames[i]         = sig;
1861     Icc ->TagSizes[i]         = 0;
1862     Icc ->TagOffsets[i]       = 0;
1863
1864     LocalTypeHandler = *TypeHandler;
1865     LocalTypeHandler.ContextID  = Icc ->ContextID;
1866     LocalTypeHandler.ICCVersion = Icc ->Version;
1867     Icc ->TagPtrs[i]            = LocalTypeHandler.DupPtr(&LocalTypeHandler, data, TagDescriptor ->ElemCount);
1868
1869     if (Icc ->TagPtrs[i] == NULL)  {
1870
1871         _cmsTagSignature2String(TypeString, (cmsTagSignature) Type);
1872         _cmsTagSignature2String(SigString,  sig);
1873         cmsSignalError(Icc ->ContextID, cmsERROR_CORRUPTION_DETECTED, "Malformed struct in type '%s' for tag '%s'", TypeString, SigString);
1874
1875         goto Error;
1876     }
1877
1878     _cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex);
1879     return TRUE;
1880
1881 Error:
1882     _cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex);
1883     return FALSE;
1884
1885 }
1886
1887 // Read and write raw data. Read/Write Raw/cooked pairs try to maintain consistency within the pair. Some sequences
1888 // raw/cooked would work, but at a cost. Data "cooked" may be converted to "raw" by using the "write" serialization logic.
1889 // In general it is better to avoid mixing pairs.
1890
1891 cmsUInt32Number CMSEXPORT cmsReadRawTag(cmsHPROFILE hProfile, cmsTagSignature sig, void* data, cmsUInt32Number BufferSize)
1892 {
1893     _cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
1894     void *Object;
1895     int i;
1896     cmsIOHANDLER* MemIO;
1897     cmsTagTypeHandler* TypeHandler = NULL;
1898     cmsTagTypeHandler LocalTypeHandler;
1899     cmsTagDescriptor* TagDescriptor = NULL;
1900     cmsUInt32Number rc;
1901     cmsUInt32Number Offset, TagSize;
1902
1903     // Sanity check
1904     if (data != NULL && BufferSize == 0) return 0;
1905
1906     if (!_cmsLockMutex(Icc->ContextID, Icc ->UsrMutex)) return 0;
1907
1908     // Search for given tag in ICC profile directory
1909
1910     i = _cmsSearchTag(Icc, sig, TRUE);
1911     if (i < 0) goto Error;                 // Not found,
1912
1913     // It is already read?
1914     if (Icc -> TagPtrs[i] == NULL) {
1915
1916         // Not yet, get original position
1917         Offset   = Icc ->TagOffsets[i];
1918         TagSize  = Icc ->TagSizes[i];
1919
1920         // read the data directly, don't keep copy
1921
1922         if (data != NULL) {
1923
1924             if (BufferSize < TagSize)
1925                 TagSize = BufferSize;
1926
1927             if (!Icc ->IOhandler ->Seek(Icc ->IOhandler, Offset)) goto Error;
1928             if (!Icc ->IOhandler ->Read(Icc ->IOhandler, data, 1, TagSize)) goto Error;
1929
1930             _cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex);
1931             return TagSize;
1932         }
1933
1934         _cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex);
1935         return Icc ->TagSizes[i];
1936     }
1937
1938     // The data has been already read, or written. But wait!, maybe the user choose to save as
1939     // raw data. In this case, return the raw data directly
1940
1941     if (Icc ->TagSaveAsRaw[i]) {
1942
1943         if (data != NULL)  {
1944
1945             TagSize  = Icc ->TagSizes[i];
1946             if (BufferSize < TagSize)
1947                 TagSize = BufferSize;
1948
1949             memmove(data, Icc ->TagPtrs[i], TagSize);
1950
1951             _cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex);
1952             return TagSize;
1953         }
1954
1955         _cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex);
1956         return Icc ->TagSizes[i];
1957     }
1958
1959     // Already read, or previously set by cmsWriteTag(). We need to serialize that
1960     // data to raw to get something that makes sense
1961
1962     _cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex);
1963     Object = cmsReadTag(hProfile, sig);
1964     if (!_cmsLockMutex(Icc->ContextID, Icc ->UsrMutex)) return 0;
1965
1966     if (Object == NULL) goto Error;
1967
1968     // Now we need to serialize to a memory block: just use a memory iohandler
1969
1970     if (data == NULL) {
1971         MemIO = cmsOpenIOhandlerFromNULL(cmsGetProfileContextID(hProfile));
1972     } else{
1973         MemIO = cmsOpenIOhandlerFromMem(cmsGetProfileContextID(hProfile), data, BufferSize, "w");
1974     }
1975     if (MemIO == NULL) goto Error;
1976
1977     // Obtain type handling for the tag
1978     TypeHandler = Icc ->TagTypeHandlers[i];
1979     TagDescriptor = _cmsGetTagDescriptor(Icc-> ContextID, sig);
1980     if (TagDescriptor == NULL) {
1981         cmsCloseIOhandler(MemIO);
1982         goto Error;
1983     }
1984
1985     if (TypeHandler == NULL) goto Error;
1986
1987     // Serialize
1988     LocalTypeHandler = *TypeHandler;
1989     LocalTypeHandler.ContextID  = Icc ->ContextID;
1990     LocalTypeHandler.ICCVersion = Icc ->Version;
1991
1992     if (!_cmsWriteTypeBase(MemIO, TypeHandler ->Signature)) {
1993         cmsCloseIOhandler(MemIO);
1994         goto Error;
1995     }
1996
1997     if (!LocalTypeHandler.WritePtr(&LocalTypeHandler, MemIO, Object, TagDescriptor ->ElemCount)) {
1998         cmsCloseIOhandler(MemIO);
1999         goto Error;
2000     }
2001
2002     // Get Size and close
2003     rc = MemIO ->Tell(MemIO);
2004     cmsCloseIOhandler(MemIO);      // Ignore return code this time
2005
2006     _cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex);
2007     return rc;
2008
2009 Error:
2010     _cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex);
2011     return 0;
2012 }
2013
2014 // Similar to the anterior. This function allows to write directly to the ICC profile any data, without
2015 // checking anything. As a rule, mixing Raw with cooked doesn't work, so writing a tag as raw and then reading
2016 // it as cooked without serializing does result into an error. If that is what you want, you will need to dump
2017 // the profile to memry or disk and then reopen it.
2018 cmsBool CMSEXPORT cmsWriteRawTag(cmsHPROFILE hProfile, cmsTagSignature sig, const void* data, cmsUInt32Number Size)
2019 {
2020     _cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
2021     int i;
2022
2023     if (!_cmsLockMutex(Icc->ContextID, Icc ->UsrMutex)) return 0;
2024
2025     if (!_cmsNewTag(Icc, sig, &i)) {
2026         _cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex);
2027          return FALSE;
2028     }
2029
2030     // Mark the tag as being written as RAW
2031     Icc ->TagSaveAsRaw[i] = TRUE;
2032     Icc ->TagNames[i]     = sig;
2033     Icc ->TagLinked[i]    = (cmsTagSignature) 0;
2034
2035     // Keep a copy of the block
2036     Icc ->TagPtrs[i]  = _cmsDupMem(Icc ->ContextID, data, Size);
2037     Icc ->TagSizes[i] = Size;
2038
2039     _cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex);
2040
2041     if (Icc->TagPtrs[i] == NULL) {
2042            Icc->TagNames[i] = (cmsTagSignature) 0;
2043            return FALSE;
2044     }
2045     return TRUE;
2046 }
2047
2048 // Using this function you can collapse several tag entries to the same block in the profile
2049 cmsBool CMSEXPORT cmsLinkTag(cmsHPROFILE hProfile, cmsTagSignature sig, cmsTagSignature dest)
2050 {
2051     _cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
2052     int i;
2053
2054      if (!_cmsLockMutex(Icc->ContextID, Icc ->UsrMutex)) return FALSE;
2055
2056     if (!_cmsNewTag(Icc, sig, &i)) {
2057         _cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex);
2058         return FALSE;
2059     }
2060
2061     // Keep necessary information
2062     Icc ->TagSaveAsRaw[i] = FALSE;
2063     Icc ->TagNames[i]     = sig;
2064     Icc ->TagLinked[i]    = dest;
2065
2066     Icc ->TagPtrs[i]    = NULL;
2067     Icc ->TagSizes[i]   = 0;
2068     Icc ->TagOffsets[i] = 0;
2069
2070     _cmsUnlockMutex(Icc->ContextID, Icc ->UsrMutex);
2071     return TRUE;
2072 }
2073
2074
2075 // Returns the tag linked to sig, in the case two tags are sharing same resource
2076 cmsTagSignature  CMSEXPORT cmsTagLinkedTo(cmsHPROFILE hProfile, cmsTagSignature sig)
2077 {
2078     _cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
2079     int i;
2080
2081     // Search for given tag in ICC profile directory
2082     i = _cmsSearchTag(Icc, sig, FALSE);
2083     if (i < 0) return (cmsTagSignature) 0;                 // Not found, return 0
2084
2085     return Icc -> TagLinked[i];
2086 }