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 #include "config.h"
  13
  14 #ifdef HAVE_EXIV2
  15
  16 #include <exiv2/image.hpp>
  17 #include <exiv2/exif.hpp>
  18 #include <iostream>
  19
  20 // EXIV2_TEST_VERSION is defined in Exiv2 0.15 and newer.
  21 #ifndef EXIV2_TEST_VERSION
  22 # define EXIV2_TEST_VERSION(major,minor,patch) \
  23         ( EXIV2_VERSION >= EXIV2_MAKE_VERSION(major,minor,patch) )
  24 #endif
  25
  26
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29 #include <unistd.h>
  30 #include <fcntl.h>
  31 #include <sys/mman.h>
  32
  33 #if !EXIV2_TEST_VERSION(0,17,90)
  34 #include <exiv2/tiffparser.hpp>
  35 #include <exiv2/tiffcomposite.hpp>
  36 #include <exiv2/tiffvisitor.hpp>
  37 #include <exiv2/tiffimage.hpp>
  38 #include <exiv2/cr2image.hpp>
  39 #include <exiv2/crwimage.hpp>
  40 #if EXIV2_TEST_VERSION(0,16,0)
  41 #include <exiv2/orfimage.hpp>
  42 #endif
  43 #if EXIV2_TEST_VERSION(0,13,0)
  44 #include <exiv2/rafimage.hpp>
  45 #endif
  46 #include <exiv2/futils.hpp>
  47 #else
  48 #include <exiv2/preview.hpp>
  49 #endif
  50
  51
  52 extern "C" {
  53 #include <glib.h>
  54
  55 #include "main.h"
  56 #include "exif.h"
  57
  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                 Exiv2::Metadatum *metadatum = (Exiv2::Metadatum *)item;
 451 #if EXIV2_TEST_VERSION(0,17,0)
 452                 return g_strdup(metadatum->print().c_str());
 453 #else
 454                 std::stringstream str;
 455                 Exiv2::Exifdatum *exifdatum;
 456                 Exiv2::Iptcdatum *iptcdatum;
 457 #if EXIV2_TEST_VERSION(0,16,0)
 458                 Exiv2::Xmpdatum *xmpdatum;
 459 #endif
 460                 if ((exifdatum = dynamic_cast<Exiv2::Exifdatum *>(metadatum)))
 461                         str << *exifdatum;
 462                 else if ((iptcdatum = dynamic_cast<Exiv2::Iptcdatum *>(metadatum)))
 463                         str << *iptcdatum;
 464 #if EXIV2_TEST_VERSION(0,16,0)
 465                 else if ((xmpdatum = dynamic_cast<Exiv2::Xmpdatum *>(metadatum)))
 466                         str << *xmpdatum;
 467 #endif
 468
 469                 return g_strdup(str.str().c_str());
 470 #endif
 471         }
 472         catch (Exiv2::AnyError& e) {
 473                 return NULL;
 474         }
 475 }
 476
 477 gchar *exif_item_get_string(ExifItem *item, int idx)
 478 {
 479         try {
 480                 if (!item) return NULL;
 481                 Exiv2::Metadatum *em = (Exiv2::Metadatum *)item;
 482 #if EXIV2_TEST_VERSION(0,16,0)
 483                 std::string str = em->toString(idx);
 484 #else
 485                 std::string str = em->toString(); // FIXME
 486 #endif
 487                 if (idx == 0 && str == "") str = em->toString();
 488                 if (str.length() > 5 && str.substr(0, 5) == "lang=")
 489                         {
 490                         std::string::size_type pos = str.find_first_of(' ');
 491                         if (pos != std::string::npos) str = str.substr(pos+1);
 492                         }
 493
 494                 return g_strdup(str.c_str());
 495         }
 496         catch (Exiv2::AnyError& e) {
 497                 return NULL;
 498         }
 499 }
 500
 501
 502 gint exif_item_get_integer(ExifItem *item, gint *value)
 503 {
 504         try {
 505                 if (!item) return 0;
 506                 *value = ((Exiv2::Metadatum *)item)->toLong();
 507                 return 1;
 508         }
 509         catch (Exiv2::AnyError& e) {
 510                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 511                 return 0;
 512         }
 513 }
 514
 515 ExifRational *exif_item_get_rational(ExifItem *item, gint *sign, gint n)
 516 {
 517         try {
 518                 if (!item) return NULL;
 519                 if (n >= exif_item_get_elements(item)) return NULL;
 520                 Exiv2::Rational v = ((Exiv2::Metadatum *)item)->toRational(n);
 521                 static ExifRational ret;
 522                 ret.num = v.first;
 523                 ret.den = v.second;
 524                 if (sign) *sign = (((Exiv2::Metadatum *)item)->typeId() == Exiv2::signedRational);
 525                 return &ret;
 526         }
 527         catch (Exiv2::AnyError& e) {
 528                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 529                 return NULL;
 530         }
 531 }
 532
 533 const gchar *exif_get_tag_description_by_key(const gchar *key)
 534 {
 535         try {
 536                 Exiv2::ExifKey ekey(key);
 537                 return Exiv2::ExifTags::tagLabel(ekey.tag(), ekey.ifdId ());
 538         }
 539         catch (Exiv2::AnyError& e) {
 540                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 541                 return NULL;
 542         }
 543 }
 544
 545 int exif_item_set_string(ExifItem *item, const char *str)
 546 {
 547         try {
 548                 if (!item) return 0;
 549                 ((Exiv2::Metadatum *)item)->setValue(std::string(str));
 550                 return 1;
 551                 }
 552         catch (Exiv2::AnyError& e) {
 553                 return 0;
 554         }
 555 }
 556
 557 int exif_item_delete(ExifData *exif, ExifItem *item)
 558 {
 559         try {
 560                 if (!item) return 0;
 561                 for (Exiv2::ExifData::iterator i = exif->exifData().begin(); i != exif->exifData().end(); ++i) {
 562                         if (((Exiv2::Metadatum *)item) == &*i) {
 563                                 i = exif->exifData().erase(i);
 564                                 return 1;
 565                         }
 566                 }
 567                 for (Exiv2::IptcData::iterator i = exif->iptcData().begin(); i != exif->iptcData().end(); ++i) {
 568                         if (((Exiv2::Metadatum *)item) == &*i) {
 569                                 i = exif->iptcData().erase(i);
 570                                 return 1;
 571                         }
 572                 }
 573 #if EXIV2_TEST_VERSION(0,16,0)
 574                 for (Exiv2::XmpData::iterator i = exif->xmpData().begin(); i != exif->xmpData().end(); ++i) {
 575                         if (((Exiv2::Metadatum *)item) == &*i) {
 576                                 i = exif->xmpData().erase(i);
 577                                 return 1;
 578                         }
 579                 }
 580 #endif
 581                 return 0;
 582         }
 583         catch (Exiv2::AnyError& e) {
 584                 return 0;
 585         }
 586 }
 587
 588 void exif_add_jpeg_color_profile(ExifData *exif, unsigned char *cp_data, guint cp_length)
 589 {
 590         if (exif->cp_data) g_free(exif->cp_data);
 591         exif->cp_data = cp_data;
 592         exif->cp_length =cp_length;
 593 }
 594
 595 guchar *exif_get_color_profile(ExifData *exif, guint *data_len)
 596 {
 597         if (exif->cp_data)
 598                 {
 599                 if (data_len) *data_len = exif->cp_length;
 600                 return (unsigned char *) g_memdup(exif->cp_data, exif->cp_length);
 601                 }
 602         ExifItem *prof_item = exif_get_item(exif, "Exif.Image.InterColorProfile");
 603         if (prof_item && exif_item_get_format_id(prof_item) == EXIF_FORMAT_UNDEFINED)
 604                 return (unsigned char *) exif_item_get_data(prof_item, data_len);
 605         return NULL;
 606 }
 607
 608 #if EXIV2_TEST_VERSION(0,17,90)
 609
 610 guchar *exif_get_preview(ExifData *exif, guint *data_len)
 611 {
 612         if (!exif) return NULL;
 613
 614         const char* path = exif->image->io().path().c_str();
 615         /* given image pathname, first do simple (and fast) file extension test */
 616         if (!filter_file_class(path, FORMAT_CLASS_RAWIMAGE)) return NULL;
 617
 618         try {
 619
 620                 Exiv2::PreviewImageLoader loader(*exif->image);
 621
 622                 Exiv2::PreviewPropertiesList list = loader.getPreviewPropertiesList();
 623
 624                 if (!list.empty())
 625                         {
 626                         Exiv2::PreviewPropertiesList::iterator pos = --list.end();
 627
 628                         Exiv2::PreviewImage image = loader.getPreviewImage(*pos);
 629
 630                         Exiv2::DataBuf &buf = image.data();
 631                         std::pair<Exiv2::byte*, long> p = buf.release();
 632
 633                         *data_len = p.second;
 634                         return p.first;
 635                         }
 636                 return NULL;
 637         }
 638         catch (Exiv2::AnyError& e) {
 639                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 640                 return NULL;
 641         }
 642 }
 643
 644 void exif_free_preview(guchar *buf)
 645 {
 646         delete[] (Exiv2::byte*)buf;
 647 }
 648 #endif
 649
 650 }
 651 #if !EXIV2_TEST_VERSION(0,17,90)
 652
 653 /* This is a dirty hack to support raw file preview, bassed on
 654 tiffparse.cpp from Exiv2 examples */
 655
 656 class RawFile {
 657         public:
 658
 659         RawFile(Exiv2::BasicIo &io);
 660         ~RawFile();
 661
 662         const Exiv2::Value *find(uint16_t tag, uint16_t group);
 663
 664         unsigned long preview_offset();
 665
 666         private:
 667         int type;
 668         Exiv2::TiffComponent::AutoPtr rootDir;
 669         Exiv2::BasicIo &io_;
 670         const Exiv2::byte *map_data;
 671         size_t map_len;
 672         unsigned long offset;
 673 };
 674
 675 typedef struct _UnmapData UnmapData;
 676 struct _UnmapData
 677 {
 678         guchar *ptr;
 679         guchar *map_data;
 680         size_t map_len;
 681 };
 682
 683 static GList *exif_unmap_list = 0;
 684
 685 extern "C" guchar *exif_get_preview(ExifData *exif, guint *data_len)
 686 {
 687         unsigned long offset;
 688
 689         if (!exif) return NULL;
 690         const char* path = exif->image->io().path().c_str();
 691
 692         /* given image pathname, first do simple (and fast) file extension test */
 693         if (!filter_file_class(path, FORMAT_CLASS_RAWIMAGE)) return NULL;
 694
 695         try {
 696                 struct stat st;
 697                 guchar *map_data;
 698                 size_t map_len;
 699                 UnmapData *ud;
 700                 int fd;
 701
 702                 RawFile rf(exif->image->io());
 703                 offset = rf.preview_offset();
 704                 DEBUG_1("%s: offset %lu", path, offset);
 705
 706                 fd = open(path, O_RDONLY);
 707                 if (fd == -1)
 708                         {
 709                         return NULL;
 710                         }
 711
 712                 if (fstat(fd, &st) == -1)
 713                         {
 714                         close(fd);
 715                         return NULL;
 716                         }
 717                 map_len = st.st_size;
 718                 map_data = (guchar *) mmap(0, map_len, PROT_READ, MAP_PRIVATE, fd, 0);
 719                 close(fd);
 720                 if (map_data == MAP_FAILED)
 721                         {
 722                         return NULL;
 723                         }
 724                 *data_len = map_len - offset;
 725                 ud = g_new(UnmapData, 1);
 726                 ud->ptr = map_data + offset;
 727                 ud->map_data = map_data;
 728                 ud->map_len = map_len;
 729
 730                 exif_unmap_list = g_list_prepend(exif_unmap_list, ud);
 731                 return ud->ptr;
 732
 733         }
 734         catch (Exiv2::AnyError& e) {
 735                 std::cout << "Caught Exiv2 exception '" << e << "'\n";
 736         }
 737         return NULL;
 738
 739 }
 740
 741 void exif_free_preview(guchar *buf)
 742 {
 743         GList *work = exif_unmap_list;
 744
 745         while (work)
 746                 {
 747                 UnmapData *ud = (UnmapData *)work->data;
 748                 if (ud->ptr == buf)
 749                         {
 750                         munmap(ud->map_data, ud->map_len);
 751                         exif_unmap_list = g_list_remove_link(exif_unmap_list, work);
 752                         g_free(ud);
 753                         return;
 754                         }
 755                 work = work->next;
 756                 }
 757         g_assert_not_reached();
 758 }
 759
 760 using namespace Exiv2;
 761
 762 RawFile::RawFile(BasicIo &io) : io_(io), map_data(NULL), map_len(0), offset(0)
 763 {
 764 /*
 765         struct stat st;
 766         if (fstat(fd, &st) == -1)
 767                 {
 768                 throw Error(14);
 769                 }
 770         map_len = st.st_size;
 771         map_data = (Exiv2::byte *) mmap(0, map_len, PROT_READ, MAP_PRIVATE, fd, 0);
 772         if (map_data == MAP_FAILED)
 773                 {
 774                 throw Error(14);
 775                 }
 776 */
 777         if (io.open() != 0) {
 778             throw Error(9, io.path(), strError());
 779         }
 780
 781         map_data = io.mmap();
 782         map_len = io.size();
 783
 784
 785         type = Exiv2::ImageFactory::getType(map_data, map_len);
 786
 787 #if EXIV2_TEST_VERSION(0,16,0)
 788         TiffHeaderBase *tiffHeader = NULL;
 789 #else
 790         TiffHeade2 *tiffHeader = NULL;
 791 #endif
 792         Cr2Header *cr2Header = NULL;
 793
 794         switch (type) {
 795                 case Exiv2::ImageType::tiff:
 796                         tiffHeader = new TiffHeade2();
 797                         break;
 798                 case Exiv2::ImageType::cr2:
 799                         cr2Header = new Cr2Header();
 800                         break;
 801 #if EXIV2_TEST_VERSION(0,16,0)
 802                 case Exiv2::ImageType::orf:
 803                         tiffHeader = new OrfHeader();
 804                         break;
 805 #endif
 806 #if EXIV2_TEST_VERSION(0,13,0)
 807                 case Exiv2::ImageType::raf:
 808                         if (map_len < 84 + 4) throw Error(14);
 809                         offset = getULong(map_data + 84, bigEndian);
 810                         return;
 811 #endif
 812                 case Exiv2::ImageType::crw:
 813                         {
 814                         // Parse the image, starting with a CIFF header component
 815                         Exiv2::CiffHeader::AutoPtr parseTree(new Exiv2::CiffHeader);
 816                         parseTree->read(map_data, map_len);
 817                         CiffComponent *entry = parseTree->findComponent(0x2007, 0);
 818                         if (entry) offset =  entry->pData() - map_data;
 819                         return;
 820                         }
 821
 822                 default:
 823                         throw Error(3, "RAW");
 824         }
 825
 826         // process tiff-like formats
 827
 828         TiffCompFactoryFct createFct = TiffCreator::create;
 829
 830         rootDir = createFct(Tag::root, Group::none);
 831         if (0 == rootDir.get()) {
 832                 throw Error(1, "No root element defined in TIFF structure");
 833         }
 834
 835         if (tiffHeader)
 836                 {
 837                 if (!tiffHeader->read(map_data, map_len)) throw Error(3, "TIFF");
 838 #if EXIV2_TEST_VERSION(0,16,0)
 839                 rootDir->setStart(map_data + tiffHeader->offset());
 840 #else
 841                 rootDir->setStart(map_data + tiffHeader->ifdOffset());
 842 #endif
 843                 }
 844
 845         if (cr2Header)
 846                 {
 847                 rootDir->setStart(map_data + cr2Header->offset());
 848                 }
 849
 850         TiffRwState::AutoPtr state(new TiffRwState(tiffHeader ? tiffHeader->byteOrder() : littleEndian, 0, createFct));
 851
 852         TiffReader reader(map_data,
 853                           map_len,
 854                           rootDir.get(),
 855                           state);
 856
 857         rootDir->accept(reader);
 858
 859         if (tiffHeader)
 860                 delete tiffHeader;
 861         if (cr2Header)
 862                 delete cr2Header;
 863 }
 864
 865 RawFile::~RawFile(void)
 866 {
 867         io_.munmap();
 868         io_.close();
 869 }
 870
 871 const Value * RawFile::find(uint16_t tag, uint16_t group)
 872 {
 873         TiffFinder finder(tag, group);
 874         rootDir->accept(finder);
 875         TiffEntryBase* te = dynamic_cast<TiffEntryBase*>(finder.result());
 876         if (te)
 877                 {
 878                 DEBUG_1("(tag: %04x %04x) ", tag, group);
 879                 return te->pValue();
 880                 }
 881         else
 882                 return NULL;
 883 }
 884
 885 unsigned long RawFile::preview_offset(void)
 886 {
 887         const Value *val;
 888         if (offset) return offset;
 889
 890         if (type == Exiv2::ImageType::cr2)
 891                 {
 892                 val = find(0x111, Group::ifd0);
 893                 if (val) return val->toLong();
 894
 895                 return 0;
 896                 }
 897
 898         val = find(0x201, Group::sub0_0);
 899         if (val) return val->toLong();
 900
 901         val = find(0x201, Group::ifd0);
 902         if (val) return val->toLong();
 903
 904         val = find(0x201, Group::ignr); // for PEF files, originally it was probably ifd2
 905         if (val) return val->toLong();
 906
 907         val = find(0x111, Group::sub0_1); // dng
 908         if (val) return val->toLong();
 909
 910         return 0;
 911 }
 912
 913
 914 #endif
 915
 916
 917 #endif
 918 /* HAVE_EXIV2 */