src/exiv2.cc

   1 /*
   2  * Geeqie
   3  * Copyright (C) 2008 The Geeqie Team
   4  *
   5  * Author: Vladimir Nadvornik
   6  *
   7  * This software is released under the GNU General Public License (GNU GPL).
   8  * Please read the included file COPYING for more information.
   9  * This software comes with no warranty of any kind, use at your own risk!
  10  */
  11
  12 #ifdef HAVE_CONFIG_H
  13 #  include "config.h"
  14 #endif
  15
  16 #ifdef HAVE_EXIV2
  17
  18 #include <exiv2/image.hpp>
  19 #include <exiv2/exif.hpp>
  20 #include <iostream>
  21
  22 // EXIV2_TEST_VERSION is defined in Exiv2 0.15 and newer.
  23 #ifndef EXIV2_TEST_VERSION
  24 # define EXIV2_TEST_VERSION(major,minor,patch) \
  25         ( EXIV2_VERSION >= EXIV2_MAKE_VERSION(major,minor,patch) )
  26 #endif
  27
  28
  29 #include <sys/types.h>
  30 #include <sys/stat.h>
  31 #include <unistd.h>
  32 #include <fcntl.h>
  33 #include <sys/mman.h>
  34
  35 #include <exiv2/tiffparser.hpp>
  36 #include <exiv2/tiffcomposite.hpp>
  37 #include <exiv2/tiffvisitor.hpp>
  38 #include <exiv2/tiffimage.hpp>
  39 #include <exiv2/cr2image.hpp>
  40 #include <exiv2/crwimage.hpp>
  41 #if EXIV2_TEST_VERSION(0,16,0)
  42 #include <exiv2/orfimage.hpp>
  43 #endif
  44 #if EXIV2_TEST_VERSION(0,13,0)
  45 #include <exiv2/rafimage.hpp>
  46 #endif
  47 #include <exiv2/futils.hpp>
  48
  49
  50
  51 extern "C" {
  52 #include <glib.h>
  53
  54 #include "main.h"
  55 #include "exif.h"
  56
  57 #include "debug.h"
  58 #include "filefilter.h"
  59 #include "ui_fileops.h"
  60 }
  61
  62 struct _ExifData
  63 {
  64         Exiv2::Image::AutoPtr image;
  65         Exiv2::Image::AutoPtr sidecar;
  66         Exiv2::ExifData::const_iterator exifIter; /* for exif_get_next_item */
  67         Exiv2::IptcData::const_iterator iptcIter; /* for exif_get_next_item */
  68 #if EXIV2_TEST_VERSION(0,16,0)
  69         Exiv2::XmpData::const_iterator xmpIter; /* for exif_get_next_item */
  70 #endif
  71         bool have_sidecar;
  72
  73         /* the icc profile in jpeg is not technically exif - store it here */
  74         unsigned char *cp_data;
  75         guint cp_length;
  76
  77         _ExifData(gchar *path, gchar *sidecar_path)
  78         {
  79                 have_sidecar = false;
  80                 cp_data = NULL;
  81                 cp_length = 0;
  82                 gchar *pathl = path_from_utf8(path);
  83                 image = Exiv2::ImageFactory::open(pathl);
  84                 g_free(pathl);
  85 //              g_assert (image.get() != 0);
  86                 image->readMetadata();
  87
  88 #if EXIV2_TEST_VERSION(0,16,0)
  89                 DEBUG_2("xmp count %li", image->xmpData().count());
  90                 if (sidecar_path && image->xmpData().empty())
  91                         {
  92                         gchar *sidecar_pathl = path_from_utf8(sidecar_path);
  93                         sidecar = Exiv2::ImageFactory::open(sidecar_pathl);
  94                         g_free(sidecar_pathl);
  95                         sidecar->readMetadata();
  96                         have_sidecar = sidecar->good();
  97                         DEBUG_2("sidecar xmp count %li", sidecar->xmpData().count());
  98                         }
  99
 100 #endif
 101 #if EXIV2_TEST_VERSION(0,14,0)
 102                 if (image->mimeType() == std::string("image/jpeg"))
 103                         {
 104                         /* try to get jpeg color profile */
 105                         Exiv2::BasicIo &io = image->io();
 106                         gint open = io.isopen();
 107                         if (!open) io.open();
 108                         unsigned char *mapped = (unsigned char*)io.mmap();
 109                         if (mapped) exif_jpeg_parse_color(this, mapped, io.size());
 110                         io.munmap();
 111                         if (!open) io.close();
 112                         }
 113 #endif
 114         }
 115
 116         ~_ExifData()
 117         {
 118                 if (cp_data) g_free(cp_data);
 119         }
 120
 121         void writeMetadata()
 122         {
 123                 if (have_sidecar) sidecar->writeMetadata();
 124                 image->writeMetadata();
 125         }
 126
 127         Exiv2::ExifData &exifData ()
 128         {
 129                 return image->exifData();
 130         }
 131
 132         Exiv2::IptcData &iptcData ()
 133         {
 134                 return image->iptcData();
 135         }
 136
 137 #if EXIV2_TEST_VERSION(0,16,0)
 138         Exiv2::XmpData &xmpData ()
 139         {
 140                 return have_sidecar ? sidecar->xmpData() : image->xmpData();
 141         }
 142 #endif
 143
 144 };
 145
 146 extern "C" {
 147
 148 ExifData *exif_read(gchar *path, gchar *sidecar_path)
 149 {
 150         DEBUG_1("exif read %s, sidecar: %s", path, sidecar_path ? sidecar_path : "-");
 151         try {
 152                 return new ExifData(path, sidecar_path);
 153         }
 154         catch (Exiv2::AnyError& e) {
 155                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 156                 return NULL;
 157         }
 158
 159 }
 160
 161 int exif_write(ExifData *exif)
 162 {
 163         try {
 164                 exif->writeMetadata();
 165                 return 1;
 166         }
 167         catch (Exiv2::AnyError& e) {
 168                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 169                 return 0;
 170         }
 171
 172 }
 173
 174
 175 void exif_free(ExifData *exif)
 176 {
 177
 178         delete exif;
 179 }
 180
 181 ExifItem *exif_get_item(ExifData *exif, const gchar *key)
 182 {
 183         try {
 184                 Exiv2::Metadatum *item = NULL;
 185                 try {
 186                         Exiv2::ExifKey ekey(key);
 187                         Exiv2::ExifData::iterator pos = exif->exifData().findKey(ekey);
 188                         if (pos == exif->exifData().end()) return NULL;
 189                         item = &*pos;
 190                 }
 191                 catch (Exiv2::AnyError& e) {
 192                         try {
 193                                 Exiv2::IptcKey ekey(key);
 194                                 Exiv2::IptcData::iterator pos = exif->iptcData().findKey(ekey);
 195                                 if (pos == exif->iptcData().end()) return NULL;
 196                                 item = &*pos;
 197                         }
 198                         catch (Exiv2::AnyError& e) {
 199 #if EXIV2_TEST_VERSION(0,16,0)
 200                                 Exiv2::XmpKey ekey(key);
 201                                 Exiv2::XmpData::iterator pos = exif->xmpData().findKey(ekey);
 202                                 if (pos == exif->xmpData().end()) return NULL;
 203                                 item = &*pos;
 204 #endif
 205                         }
 206                 }
 207                 return (ExifItem *)item;
 208         }
 209         catch (Exiv2::AnyError& e) {
 210                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 211                 return NULL;
 212         }
 213 }
 214
 215 ExifItem *exif_add_item(ExifData *exif, const gchar *key)
 216 {
 217         try {
 218                 Exiv2::Metadatum *item = NULL;
 219                 try {
 220                         Exiv2::ExifKey ekey(key);
 221                         exif->exifData().add(ekey, NULL);
 222                         Exiv2::ExifData::iterator pos = exif->exifData().end(); // a hack, there should be a better way to get the currently added item
 223                         pos--;
 224                         item = &*pos;
 225                 }
 226                 catch (Exiv2::AnyError& e) {
 227                         try {
 228                                 Exiv2::IptcKey ekey(key);
 229                                 exif->iptcData().add(ekey, NULL);
 230                                 Exiv2::IptcData::iterator pos = exif->iptcData().end();
 231                                 pos--;
 232                                 item = &*pos;
 233                         }
 234                         catch (Exiv2::AnyError& e) {
 235 #if EXIV2_TEST_VERSION(0,16,0)
 236                                 Exiv2::XmpKey ekey(key);
 237                                 exif->xmpData().add(ekey, NULL);
 238                                 Exiv2::XmpData::iterator pos = exif->xmpData().end();
 239                                 pos--;
 240                                 item = &*pos;
 241 #endif
 242                         }
 243                 }
 244                 return (ExifItem *)item;
 245         }
 246         catch (Exiv2::AnyError& e) {
 247                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 248                 return NULL;
 249         }
 250 }
 251
 252
 253 ExifItem *exif_get_first_item(ExifData *exif)
 254 {
 255         try {
 256                 exif->exifIter = exif->exifData().begin();
 257                 exif->iptcIter = exif->iptcData().begin();
 258 #if EXIV2_TEST_VERSION(0,16,0)
 259                 exif->xmpIter = exif->xmpData().begin();
 260 #endif
 261                 if (exif->exifIter != exif->exifData().end())
 262                         {
 263                         const Exiv2::Metadatum *item = &*exif->exifIter;
 264                         exif->exifIter++;
 265                         return (ExifItem *)item;
 266                         }
 267                 if (exif->iptcIter != exif->iptcData().end())
 268                         {
 269                         const Exiv2::Metadatum *item = &*exif->iptcIter;
 270                         exif->iptcIter++;
 271                         return (ExifItem *)item;
 272                         }
 273 #if EXIV2_TEST_VERSION(0,16,0)
 274                 if (exif->xmpIter != exif->xmpData().end())
 275                         {
 276                         const Exiv2::Metadatum *item = &*exif->xmpIter;
 277                         exif->xmpIter++;
 278                         return (ExifItem *)item;
 279                         }
 280 #endif
 281                 return NULL;
 282
 283         }
 284         catch (Exiv2::AnyError& e) {
 285                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 286                 return NULL;
 287         }
 288 }
 289
 290 ExifItem *exif_get_next_item(ExifData *exif)
 291 {
 292         try {
 293                 if (exif->exifIter != exif->exifData().end())
 294                         {
 295                         const Exiv2::Metadatum *item = &*exif->exifIter;
 296                         exif->exifIter++;
 297                         return (ExifItem *)item;
 298                 }
 299                 if (exif->iptcIter != exif->iptcData().end())
 300                         {
 301                         const Exiv2::Metadatum *item = &*exif->iptcIter;
 302                         exif->iptcIter++;
 303                         return (ExifItem *)item;
 304                 }
 305 #if EXIV2_TEST_VERSION(0,16,0)
 306                 if (exif->xmpIter != exif->xmpData().end())
 307                         {
 308                         const Exiv2::Metadatum *item = &*exif->xmpIter;
 309                         exif->xmpIter++;
 310                         return (ExifItem *)item;
 311                 }
 312 #endif
 313                 return NULL;
 314         }
 315         catch (Exiv2::AnyError& e) {
 316                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 317                 return NULL;
 318         }
 319 }
 320
 321 char *exif_item_get_tag_name(ExifItem *item)
 322 {
 323         try {
 324                 if (!item) return NULL;
 325                 return g_strdup(((Exiv2::Metadatum *)item)->key().c_str());
 326         }
 327         catch (Exiv2::AnyError& e) {
 328                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 329                 return NULL;
 330         }
 331 }
 332
 333 guint exif_item_get_tag_id(ExifItem *item)
 334 {
 335         try {
 336                 if (!item) return 0;
 337                 return ((Exiv2::Metadatum *)item)->tag();
 338         }
 339         catch (Exiv2::AnyError& e) {
 340                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 341                 return 0;
 342         }
 343 }
 344
 345 guint exif_item_get_elements(ExifItem *item)
 346 {
 347         try {
 348                 if (!item) return 0;
 349                 return ((Exiv2::Metadatum *)item)->count();
 350         }
 351         catch (Exiv2::AnyError& e) {
 352                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 353                 return 0;
 354         }
 355 }
 356
 357 char *exif_item_get_data(ExifItem *item, guint *data_len)
 358 {
 359         try {
 360                 if (!item) return 0;
 361                 Exiv2::Metadatum *md = (Exiv2::Metadatum *)item;
 362                 if(data_len) *data_len = md->size();
 363                 char *data = (char *)g_malloc(md->size());
 364                 long res = md->copy((Exiv2::byte *)data, Exiv2::littleEndian /* should not matter */);
 365                 g_assert(res == md->size());
 366                 return data;
 367         }
 368         catch (Exiv2::AnyError& e) {
 369                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 370                 return NULL;
 371         }
 372 }
 373
 374 char *exif_item_get_description(ExifItem *item)
 375 {
 376         try {
 377                 if (!item) return NULL;
 378                 return g_strdup(((Exiv2::Metadatum *)item)->tagLabel().c_str());
 379         }
 380         catch (std::exception& e) {
 381 //              std::cout << "Caught Exiv2 exception '" << e << "'\n";
 382                 return NULL;
 383         }
 384 }
 385
 386 /*
 387 invalidTypeId, unsignedByte, asciiString, unsignedShort,
 388   unsignedLong, unsignedRational, signedByte, undefined,
 389   signedShort, signedLong, signedRational, string,
 390   date, time, comment, directory,
 391   xmpText, xmpAlt, xmpBag, xmpSeq,
 392   langAlt, lastTypeId
 393 */
 394
 395 static guint format_id_trans_tbl [] = {
 396         EXIF_FORMAT_UNKNOWN,
 397         EXIF_FORMAT_BYTE_UNSIGNED,
 398         EXIF_FORMAT_STRING,
 399         EXIF_FORMAT_SHORT_UNSIGNED,
 400         EXIF_FORMAT_LONG_UNSIGNED,
 401         EXIF_FORMAT_RATIONAL_UNSIGNED,
 402         EXIF_FORMAT_BYTE,
 403         EXIF_FORMAT_UNDEFINED,
 404         EXIF_FORMAT_SHORT,
 405         EXIF_FORMAT_LONG,
 406         EXIF_FORMAT_RATIONAL,
 407         EXIF_FORMAT_STRING,
 408         EXIF_FORMAT_STRING,
 409         EXIF_FORMAT_STRING,
 410         EXIF_FORMAT_UNDEFINED,
 411         EXIF_FORMAT_STRING,
 412         EXIF_FORMAT_STRING,
 413         EXIF_FORMAT_STRING,
 414         EXIF_FORMAT_STRING
 415         };
 416
 417
 418
 419 guint exif_item_get_format_id(ExifItem *item)
 420 {
 421         try {
 422                 if (!item) return EXIF_FORMAT_UNKNOWN;
 423                 guint id = ((Exiv2::Metadatum *)item)->typeId();
 424                 if (id >= (sizeof(format_id_trans_tbl) / sizeof(format_id_trans_tbl[0])) ) return EXIF_FORMAT_UNKNOWN;
 425                 return format_id_trans_tbl[id];
 426         }
 427         catch (Exiv2::AnyError& e) {
 428                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 429                 return EXIF_FORMAT_UNKNOWN;
 430         }
 431 }
 432
 433 const char *exif_item_get_format_name(ExifItem *item, gint brief)
 434 {
 435         try {
 436                 if (!item) return NULL;
 437                 return ((Exiv2::Metadatum *)item)->typeName();
 438         }
 439         catch (Exiv2::AnyError& e) {
 440                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 441                 return NULL;
 442         }
 443 }
 444
 445
 446 gchar *exif_item_get_data_as_text(ExifItem *item)
 447 {
 448         try {
 449                 if (!item) return NULL;
 450 //              std::stringstream str;  // does not work with Exiv2::Metadatum because operator<< is not virtual
 451 //              str << *((Exiv2::Metadatum *)item);
 452 //              return g_strdup(str.str().c_str());
 453                 return g_strdup(((Exiv2::Metadatum *)item)->toString().c_str());
 454         }
 455         catch (Exiv2::AnyError& e) {
 456                 return NULL;
 457         }
 458 }
 459
 460 gchar *exif_item_get_string(ExifItem *item, int idx)
 461 {
 462         try {
 463                 if (!item) return NULL;
 464                 Exiv2::Metadatum *em = (Exiv2::Metadatum *)item;
 465 #if EXIV2_TEST_VERSION(0,16,0)
 466                 std::string str = em->toString(idx);
 467 #else
 468                 std::string str = em->toString(); // FIXME
 469 #endif
 470                 if (idx == 0 && str == "") str = em->toString();
 471                 if (str.length() > 5 && str.substr(0, 5) == "lang=")
 472                         {
 473                         std::string::size_type pos = str.find_first_of(' ');
 474                         if (pos != std::string::npos) str = str.substr(pos+1);
 475                         }
 476
 477                 return g_strdup(str.c_str());
 478         }
 479         catch (Exiv2::AnyError& e) {
 480                 return NULL;
 481         }
 482 }
 483
 484
 485 gint exif_item_get_integer(ExifItem *item, gint *value)
 486 {
 487         try {
 488                 if (!item) return 0;
 489                 *value = ((Exiv2::Metadatum *)item)->toLong();
 490                 return 1;
 491         }
 492         catch (Exiv2::AnyError& e) {
 493                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 494                 return 0;
 495         }
 496 }
 497
 498 ExifRational *exif_item_get_rational(ExifItem *item, gint *sign)
 499 {
 500         try {
 501                 if (!item) return NULL;
 502                 Exiv2::Rational v = ((Exiv2::Metadatum *)item)->toRational();
 503                 static ExifRational ret;
 504                 ret.num = v.first;
 505                 ret.den = v.second;
 506                 if (sign) *sign = (((Exiv2::Metadatum *)item)->typeId() == Exiv2::signedRational);
 507                 return &ret;
 508         }
 509         catch (Exiv2::AnyError& e) {
 510                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 511                 return NULL;
 512         }
 513 }
 514
 515 const gchar *exif_get_tag_description_by_key(const gchar *key)
 516 {
 517         try {
 518                 Exiv2::ExifKey ekey(key);
 519                 return Exiv2::ExifTags::tagLabel(ekey.tag(), ekey.ifdId ());
 520         }
 521         catch (Exiv2::AnyError& e) {
 522                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 523                 return NULL;
 524         }
 525 }
 526
 527 int exif_item_set_string(ExifItem *item, const char *str)
 528 {
 529         try {
 530                 if (!item) return 0;
 531                 ((Exiv2::Metadatum *)item)->setValue(std::string(str));
 532                 return 1;
 533         }
 534         catch (Exiv2::AnyError& e) {
 535                 return 0;
 536         }
 537 }
 538
 539 int exif_item_delete(ExifData *exif, ExifItem *item)
 540 {
 541         try {
 542                 if (!item) return 0;
 543                 for (Exiv2::ExifData::iterator i = exif->exifData().begin(); i != exif->exifData().end(); ++i) {
 544                         if (((Exiv2::Metadatum *)item) == &*i) {
 545                                 i = exif->exifData().erase(i);
 546                                 return 1;
 547                         }
 548                 }
 549                 for (Exiv2::IptcData::iterator i = exif->iptcData().begin(); i != exif->iptcData().end(); ++i) {
 550                         if (((Exiv2::Metadatum *)item) == &*i) {
 551                                 i = exif->iptcData().erase(i);
 552                                 return 1;
 553                         }
 554                 }
 555 #if EXIV2_TEST_VERSION(0,16,0)
 556                 for (Exiv2::XmpData::iterator i = exif->xmpData().begin(); i != exif->xmpData().end(); ++i) {
 557                         if (((Exiv2::Metadatum *)item) == &*i) {
 558                                 i = exif->xmpData().erase(i);
 559                                 return 1;
 560                         }
 561                 }
 562 #endif
 563                 return 0;
 564         }
 565         catch (Exiv2::AnyError& e) {
 566                 return 0;
 567         }
 568 }
 569
 570 void exif_add_jpeg_color_profile(ExifData *exif, unsigned char *cp_data, guint cp_length)
 571 {
 572         if (exif->cp_data) g_free(exif->cp_data);
 573         exif->cp_data = cp_data;
 574         exif->cp_length =cp_length;
 575 }
 576
 577 unsigned char *exif_get_color_profile(ExifData *exif, guint *data_len)
 578 {
 579         if (exif->cp_data)
 580                 {
 581                 if (data_len) *data_len = exif->cp_length;
 582                 return (unsigned char *) g_memdup(exif->cp_data, exif->cp_length);
 583                 }
 584         ExifItem *prof_item = exif_get_item(exif, "Exif.Image.InterColorProfile");
 585         if (prof_item && exif_item_get_format_id(prof_item) == EXIF_FORMAT_UNDEFINED)
 586                 return (unsigned char *) exif_item_get_data(prof_item, data_len);
 587         return NULL;
 588 }
 589
 590
 591
 592 }
 593
 594 /* This is a dirty hack to support raw file preview, bassed on
 595 tiffparse.cpp from Exiv2 examples */
 596
 597 class RawFile {
 598         public:
 599
 600         RawFile(int fd);
 601         ~RawFile();
 602
 603         const Exiv2::Value *find(uint16_t tag, uint16_t group);
 604
 605         unsigned long preview_offset();
 606
 607         private:
 608         int type;
 609         Exiv2::TiffComponent::AutoPtr rootDir;
 610         Exiv2::byte *map_data;
 611         size_t map_len;
 612         unsigned long offset;
 613 };
 614
 615 using namespace Exiv2;
 616
 617 RawFile::RawFile(int fd) : map_data(NULL), map_len(0), offset(0)
 618 {
 619         struct stat st;
 620         if (fstat(fd, &st) == -1)
 621                 {
 622                 throw Error(14);
 623                 }
 624         map_len = st.st_size;
 625         map_data = (Exiv2::byte *) mmap(0, map_len, PROT_READ, MAP_PRIVATE, fd, 0);
 626         if (map_data == MAP_FAILED)
 627                 {
 628                 throw Error(14);
 629                 }
 630         type = Exiv2::ImageFactory::getType(map_data, map_len);
 631
 632 #if EXIV2_TEST_VERSION(0,16,0)
 633         TiffHeaderBase *tiffHeader = NULL;
 634 #else
 635         TiffHeade2 *tiffHeader = NULL;
 636 #endif
 637         Cr2Header *cr2Header = NULL;
 638
 639         switch (type) {
 640                 case Exiv2::ImageType::tiff:
 641                         tiffHeader = new TiffHeade2();
 642                         break;
 643                 case Exiv2::ImageType::cr2:
 644                         cr2Header = new Cr2Header();
 645                         break;
 646 #if EXIV2_TEST_VERSION(0,16,0)
 647                 case Exiv2::ImageType::orf:
 648                         tiffHeader = new OrfHeader();
 649                         break;
 650 #endif
 651 #if EXIV2_TEST_VERSION(0,13,0)
 652                 case Exiv2::ImageType::raf:
 653                         if (map_len < 84 + 4) throw Error(14);
 654                         offset = getULong(map_data + 84, bigEndian);
 655                         return;
 656 #endif
 657                 case Exiv2::ImageType::crw:
 658                         {
 659                         // Parse the image, starting with a CIFF header component
 660                         Exiv2::CiffHeader::AutoPtr parseTree(new Exiv2::CiffHeader);
 661                         parseTree->read(map_data, map_len);
 662                         CiffComponent *entry = parseTree->findComponent(0x2007, 0);
 663                         if (entry) offset =  entry->pData() - map_data;
 664                         return;
 665                         }
 666
 667                 default:
 668                         throw Error(3, "RAW");
 669         }
 670
 671         // process tiff-like formats
 672
 673         TiffCompFactoryFct createFct = TiffCreator::create;
 674
 675         rootDir = createFct(Tag::root, Group::none);
 676         if (0 == rootDir.get()) {
 677                 throw Error(1, "No root element defined in TIFF structure");
 678         }
 679
 680         if (tiffHeader)
 681                 {
 682                 if (!tiffHeader->read(map_data, map_len)) throw Error(3, "TIFF");
 683 #if EXIV2_TEST_VERSION(0,16,0)
 684                 rootDir->setStart(map_data + tiffHeader->offset());
 685 #else
 686                 rootDir->setStart(map_data + tiffHeader->ifdOffset());
 687 #endif
 688                 }
 689
 690         if (cr2Header)
 691                 {
 692                 rootDir->setStart(map_data + cr2Header->offset());
 693                 }
 694
 695         TiffRwState::AutoPtr state(new TiffRwState(tiffHeader ? tiffHeader->byteOrder() : littleEndian, 0, createFct));
 696
 697         TiffReader reader(map_data,
 698                       map_len,
 699                       rootDir.get(),
 700                       state);
 701
 702         rootDir->accept(reader);
 703
 704         if (tiffHeader)
 705                 delete tiffHeader;
 706         if (cr2Header)
 707                 delete cr2Header;
 708 }
 709
 710 RawFile::~RawFile()
 711 {
 712         if (map_data && munmap(map_data, map_len) == -1)
 713                 {
 714                 printf("Failed to unmap file \n");
 715                 }
 716 }
 717
 718 const Value * RawFile::find(uint16_t tag, uint16_t group)
 719 {
 720         TiffFinder finder(tag, group);
 721         rootDir->accept(finder);
 722         TiffEntryBase* te = dynamic_cast<TiffEntryBase*>(finder.result());
 723         if (te)
 724                 {
 725                 DEBUG_1("(tag: %04x %04x) ", tag, group);
 726                 return te->pValue();
 727                 }
 728         else
 729                 return NULL;
 730 }
 731
 732 unsigned long RawFile::preview_offset()
 733 {
 734         const Value *val;
 735         if (offset) return offset;
 736
 737         if (type == Exiv2::ImageType::cr2)
 738                 {
 739                 val = find(0x111, Group::ifd0);
 740                 if (val) return val->toLong();
 741
 742                 return 0;
 743                 }
 744
 745         val = find(0x201, Group::sub0_0);
 746         if (val) return val->toLong();
 747
 748         val = find(0x201, Group::ifd0);
 749         if (val) return val->toLong();
 750
 751         val = find(0x201, Group::ignr); // for PEF files, originally it was probably ifd2
 752         if (val) return val->toLong();
 753
 754         val = find(0x111, Group::sub0_1); // dng
 755         if (val) return val->toLong();
 756
 757         return 0;
 758 }
 759
 760
 761 extern "C" gint format_raw_img_exif_offsets_fd(int fd, const gchar *path,
 762                                     unsigned char *header_data, const guint header_len,
 763                                     guint *image_offset, guint *exif_offset)
 764 {
 765         int success;
 766         unsigned long offset;
 767
 768         /* given image pathname, first do simple (and fast) file extension test */
 769         if (!filter_file_class(path, FORMAT_CLASS_RAWIMAGE)) return 0;
 770
 771         try {
 772                 RawFile rf(fd);
 773                 offset = rf.preview_offset();
 774                 DEBUG_1("%s: offset %lu", path, offset);
 775         }
 776         catch (Exiv2::AnyError& e) {
 777                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 778                 return 0;
 779         }
 780
 781         if (image_offset && offset > 0)
 782                 {
 783                 *image_offset = offset;
 784                 if ((unsigned long) lseek(fd, *image_offset, SEEK_SET) != *image_offset)
 785                         {
 786                         printf("Failed to seek to embedded image\n");
 787
 788                         *image_offset = 0;
 789                         if (*exif_offset) *exif_offset = 0;
 790                         success = FALSE;
 791                         }
 792                 }
 793
 794         return offset > 0;
 795 }
 796
 797
 798 #endif
 799 /* HAVE_EXIV2 */