src/exif.c

   1 /*
   2  * Copyright (C) 2003, 2006 John Ellis
   3  * Copyright (C) 2008 - 2016 The Geeqie Team
   4  *
   5  * Authors: Eric Swalens, Quy Tonthat
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  *  The tags were added with information from the FREE document:
  22  *     http://www.ba.wakwak.com/~tsuruzoh/Computer/Digicams/exif-e.html
  23  *
  24  *  For the official Exif Format, please refer to:
  25  *     http://www.exif.org
  26  *     http://www.exif.org/specifications.html (PDF spec sheets)
  27  *
  28  *  Notes:
  29  *     Additional tag formats should be added to the proper
  30  *     location in ExifKnownMarkersList[].
  31  *
  32  *     Human readable output (that needs additional processing of data to
  33  *     be useable) can be defined by adding a key to ExifFormattedList[],
  34  *     then handling that tag in the function exif_get_formatted_by_key().
  35  *     The human readable formatted keys must begin with the character 'f'.
  36  *
  37  *  Unsupported at this time:
  38  *     IFD1 (thumbnail)
  39  *     MakerNote
  40  *
  41  *  TODO:
  42  *     Convert data to useable form in the ??_as_text function for:
  43  *        ComponentsConfiguration
  44  *        UserComment (convert this to UTF-8?)
  45  *     Add support for marker tag 0x0000
  46  */
  47
  48 #include <config.h>
  49
  50 #ifndef HAVE_EXIV2
  51
  52 #include <stdio.h>
  53 #include <string.h>
  54 #include <fcntl.h>
  55 #include <unistd.h>
  56 #include <sys/types.h>
  57 #include <sys/stat.h>
  58 #include <sys/mman.h>
  59 #include <math.h>
  60
  61 #include <glib.h>
  62 #include <glib/gprintf.h>
  63
  64 #include "intl.h"
  65
  66 #include "main.h"
  67 #include "exif-int.h"
  68 #include "jpeg_parser.h"
  69
  70 #include "format_raw.h"
  71 #include "ui_fileops.h"
  72
  73
  74 /*
  75  *-----------------------------------------------------------------------------
  76  * Tag formats
  77  *-----------------------------------------------------------------------------
  78  */
  79
  80 ExifFormatAttrib ExifFormatList[] = {
  81         { EXIF_FORMAT_UNKNOWN,          1, "unknown",   "unknown" },
  82         { EXIF_FORMAT_BYTE_UNSIGNED,    1, "ubyte",     "unsigned byte" },
  83         { EXIF_FORMAT_STRING,           1, "string",    "string" },
  84         { EXIF_FORMAT_SHORT_UNSIGNED,   2, "ushort",    "unsigned short" },
  85         { EXIF_FORMAT_LONG_UNSIGNED,    4, "ulong",     "unsigned long" },
  86         { EXIF_FORMAT_RATIONAL_UNSIGNED,8, "urational", "unsigned rational" },
  87         { EXIF_FORMAT_BYTE,             1, "byte",      "byte" },
  88         { EXIF_FORMAT_UNDEFINED,        1, "undefined", "undefined" },
  89         { EXIF_FORMAT_SHORT,            2, "sshort",    "signed short" },
  90         { EXIF_FORMAT_LONG,             4, "slong",     "signed long" },
  91         { EXIF_FORMAT_RATIONAL,         8, "srational", "signed rational" },
  92         { EXIF_FORMAT_FLOAT,            4, "float",     "float" },
  93         { EXIF_FORMAT_DOUBLE,           8, "double",    "double" },
  94         { -1, 0, NULL, NULL }
  95 };
  96
  97 /* tags that are special, or need special treatment */
  98 #define TAG_EXIFOFFSET          0x8769
  99 #define TAG_EXIFMAKERNOTE       0x927c
 100 #define TAG_GPSOFFSET           0x8825
 101
 102
 103 /*
 104  *-----------------------------------------------------------------------------
 105  * Data
 106  *-----------------------------------------------------------------------------
 107  */
 108 static ExifTextList ExifCompressionList[] = {
 109         { 1, "Uncompressed" },
 110         { 2, "CCITT 1D" },
 111         { 3, "T4/Group 3 Fax" },
 112         { 4, "T6/Group 4 Fax" },
 113         { 5, "LZW" },
 114         { 6, "JPEG (old style)" },
 115         { 7, "JPEG" },
 116         { 8, "Adobe Deflate" },
 117         { 9, "JBIG B&W" },
 118         { 10, "JBIG Color" },
 119         { 32766, "Next" },
 120         { 32771, "CCIRLEW" },
 121         { 32773, "PackBits" },
 122         { 32809, "ThunderScan" },
 123         { 32895, "IT8CTPAD" },
 124         { 32896, "IT8LW" },
 125         { 32897, "IT8MP" },
 126         { 32898, "IT8BL" },
 127         { 32908, "PixasFilm" },
 128         { 32909, "PixasLog" },
 129         { 32946, "Deflate" },
 130         { 32947, "DCS" },
 131         { 34661, "JBIG" },
 132         { 34676, "SGILog" },
 133         { 34677, "SGILog24" },
 134         { 34712, "JPEF 2000" },
 135         { 34713, "Nikon NEF Compressed" },
 136         EXIF_TEXT_LIST_END
 137 };
 138
 139 static ExifTextList ExifOrientationList[] = {
 140         { EXIF_ORIENTATION_UNKNOWN,     N_("unknown") },
 141         { EXIF_ORIENTATION_TOP_LEFT,    N_("top left") },
 142         { EXIF_ORIENTATION_TOP_RIGHT,   N_("top right") },
 143         { EXIF_ORIENTATION_BOTTOM_RIGHT,N_("bottom right") },
 144         { EXIF_ORIENTATION_BOTTOM_LEFT, N_("bottom left") },
 145         { EXIF_ORIENTATION_LEFT_TOP,    N_("left top") },
 146         { EXIF_ORIENTATION_RIGHT_TOP,   N_("right top") },
 147         { EXIF_ORIENTATION_RIGHT_BOTTOM,N_("right bottom") },
 148         { EXIF_ORIENTATION_LEFT_BOTTOM, N_("left bottom") },
 149         EXIF_TEXT_LIST_END
 150 };
 151
 152 static ExifTextList ExifUnitList[] = {
 153         { EXIF_UNIT_UNKNOWN,    N_("unknown") },
 154         { EXIF_UNIT_NOUNIT,     "" },
 155         { EXIF_UNIT_INCH,       N_("inch") },
 156         { EXIF_UNIT_CENTIMETER, N_("centimeter") },
 157         EXIF_TEXT_LIST_END
 158 };
 159
 160 static ExifTextList ExifYCbCrPosList[] = {
 161         { 1,    "center" },
 162         { 2,    "datum" },
 163         EXIF_TEXT_LIST_END
 164 };
 165
 166 static ExifTextList ExifMeteringModeList[] = {
 167         { 0,    N_("unknown") },
 168         { 1,    N_("average") },
 169         { 2,    N_("center weighted") },
 170         { 3,    N_("spot") },
 171         { 4,    N_("multi-spot") },
 172         { 5,    N_("multi-segment") },
 173         { 6,    N_("partial") },
 174         { 255,  N_("other") },
 175         EXIF_TEXT_LIST_END
 176 };
 177
 178 static ExifTextList ExifExposureProgramList[] = {
 179         { 0,    N_("not defined") },
 180         { 1,    N_("manual") },
 181         { 2,    N_("normal") },
 182         { 3,    N_("aperture") },
 183         { 4,    N_("shutter") },
 184         { 5,    N_("creative") },
 185         { 6,    N_("action") },
 186         { 7,    N_("portrait") },
 187         { 8,    N_("landscape") },
 188         EXIF_TEXT_LIST_END
 189 };
 190
 191 static ExifTextList ExifLightSourceList[] = {
 192         { 0,    N_("unknown") },
 193         { 1,    N_("daylight") },
 194         { 2,    N_("fluorescent") },
 195         { 3,    N_("tungsten (incandescent)") },
 196         { 4,    N_("flash") },
 197         { 9,    N_("fine weather") },
 198         { 10,   N_("cloudy weather") },
 199         { 11,   N_("shade") },
 200         { 12,   N_("daylight fluorescent") },
 201         { 13,   N_("day white fluorescent") },
 202         { 14,   N_("cool white fluorescent") },
 203         { 15,   N_("white fluorescent") },
 204         { 17,   N_("standard light A") },
 205         { 18,   N_("standard light B") },
 206         { 19,   N_("standard light C") },
 207         { 20,   N_("D55") },
 208         { 21,   N_("D65") },
 209         { 22,   N_("D75") },
 210         { 23,   N_("D50") },
 211         { 24,   N_("ISO studio tungsten") },
 212         { 255,  N_("other") },
 213         EXIF_TEXT_LIST_END
 214 };
 215
 216 static ExifTextList ExifFlashList[] = {
 217         { 0,    N_("no") },
 218         { 1,    N_("yes") },
 219         { 5,    N_("yes, not detected by strobe") },
 220         { 7,    N_("yes, detected by strobe") },
 221         EXIF_TEXT_LIST_END
 222 };
 223
 224 static ExifTextList ExifColorSpaceList[] = {
 225         { 1,    N_("sRGB") },
 226         { 65535,N_("uncalibrated") },
 227         EXIF_TEXT_LIST_END
 228 };
 229
 230 static ExifTextList ExifSensorList[] = {
 231         { 1,    N_("not defined") },
 232         { 2,    N_("1 chip color area") },
 233         { 2,    N_("2 chip color area") },
 234         { 4,    N_("3 chip color area") },
 235         { 5,    N_("color sequential area") },
 236         { 7,    N_("trilinear") },
 237         { 8,    N_("color sequential linear") },
 238         EXIF_TEXT_LIST_END
 239 };
 240
 241 static ExifTextList ExifSourceList[] = {
 242         { 3,    N_("digital still camera") },
 243         EXIF_TEXT_LIST_END
 244 };
 245
 246 static ExifTextList ExifSceneList[] = {
 247         { 1,    N_("direct photo") },
 248         EXIF_TEXT_LIST_END
 249 };
 250
 251 static ExifTextList ExifCustRenderList[] = {
 252         { 0,    N_("normal") },
 253         { 1,    N_("custom") },
 254         EXIF_TEXT_LIST_END
 255 };
 256
 257 static ExifTextList ExifExposureModeList[] = {
 258         { 0,    N_("auto") },
 259         { 1,    N_("manual") },
 260         { 2,    N_("auto bracket") },
 261         EXIF_TEXT_LIST_END
 262 };
 263
 264 static ExifTextList ExifWhiteBalanceList[] = {
 265         { 0,    N_("auto") },
 266         { 1,    N_("manual") },
 267         EXIF_TEXT_LIST_END
 268 };
 269
 270 static ExifTextList ExifSceneCaptureList[] = {
 271         { 0,    N_("standard") },
 272         { 1,    N_("landscape") },
 273         { 2,    N_("portrait") },
 274         { 3,    N_("night scene") },
 275         EXIF_TEXT_LIST_END
 276 };
 277
 278 static ExifTextList ExifGainControlList[] = {
 279         { 0,    N_("none") },
 280         { 1,    N_("low gain up") },
 281         { 2,    N_("high gain up") },
 282         { 3,    N_("low gain down") },
 283         { 4,    N_("high gain down") },
 284         EXIF_TEXT_LIST_END
 285 };
 286
 287 static ExifTextList ExifContrastList[] = {
 288         { 0,    N_("normal") },
 289         { 1,    N_("soft") },
 290         { 2,    N_("hard") },
 291         EXIF_TEXT_LIST_END
 292 };
 293
 294 static ExifTextList ExifSaturationList[] = {
 295         { 0,    N_("normal") },
 296         { 1,    N_("low") },
 297         { 2,    N_("high") },
 298         EXIF_TEXT_LIST_END
 299 };
 300
 301 static ExifTextList ExifSharpnessList[] = {
 302         { 0,    N_("normal") },
 303         { 1,    N_("soft") },
 304         { 2,    N_("hard") },
 305         EXIF_TEXT_LIST_END
 306 };
 307
 308 static ExifTextList ExifSubjectRangeList[] = {
 309         { 0,    N_("unknown") },
 310         { 1,    N_("macro") },
 311         { 2,    N_("close") },
 312         { 3,    N_("distant") },
 313         EXIF_TEXT_LIST_END
 314 };
 315
 316 /*
 317 Tag names should match to exiv2 keys, https://www.exiv2.org/metadata.html
 318 Tags that don't match are not supported by exiv2 and should not be used anywhere in the code
 319 */
 320
 321 ExifMarker ExifKnownMarkersList[] = {
 322 { 0x0100, EXIF_FORMAT_LONG_UNSIGNED, 1,         "Exif.Image.ImageWidth",        N_("Image Width"), NULL },
 323 { 0x0101, EXIF_FORMAT_LONG_UNSIGNED, 1,         "Exif.Image.ImageLength",       N_("Image Height"), NULL },
 324 { 0x0102, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Image.BitsPerSample",     N_("Bits per Sample/Pixel"), NULL },
 325 { 0x0103, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Image.Compression",       N_("Compression"), ExifCompressionList },
 326 { 0x010e, EXIF_FORMAT_STRING, -1,               "Exif.Image.ImageDescription",  N_("Image description"), NULL },
 327 { 0x010f, EXIF_FORMAT_STRING, -1,               "Exif.Image.Make",              N_("Camera make"), NULL },
 328 { 0x0110, EXIF_FORMAT_STRING, -1,               "Exif.Image.Model",             N_("Camera model"), NULL },
 329 { 0x0112, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Image.Orientation",       N_("Orientation"), ExifOrientationList },
 330 { 0x011a, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Image.XResolution",       N_("X resolution"), NULL },
 331 { 0x011b, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Image.YResolution",       N_("Y Resolution"), NULL },
 332 { 0x0128, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Image.ResolutionUnit",    N_("Resolution units"), ExifUnitList },
 333 { 0x0131, EXIF_FORMAT_STRING, -1,               "Exif.Image.Software",          N_("Firmware"), NULL },
 334 { 0x0132, EXIF_FORMAT_STRING, 20,               "Exif.Image.DateTime",          N_("Date"), NULL },
 335 { 0x013e, EXIF_FORMAT_RATIONAL_UNSIGNED, 2,     "Exif.Image.WhitePoint",        N_("White point"), NULL },
 336 { 0x013f, EXIF_FORMAT_RATIONAL_UNSIGNED, 6,     "Exif.Image.PrimaryChromaticities",N_("Primary chromaticities"), NULL },
 337 { 0x0211, EXIF_FORMAT_RATIONAL_UNSIGNED, 3,     "Exif.Image.YCbCrCoefficients", N_("YCbCy coefficients"), NULL },
 338 { 0x0213, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Image.YCbCrPositioning",  N_("YCbCr positioning"), ExifYCbCrPosList },
 339 { 0x0214, EXIF_FORMAT_RATIONAL_UNSIGNED, 6,     "Exif.Image.ReferenceBlackWhite",N_("Black white reference"), NULL },
 340 { 0x8298, EXIF_FORMAT_STRING, -1,               "Exif.Image.Copyright",         N_("Copyright"), NULL },
 341 { 0x8769, EXIF_FORMAT_LONG_UNSIGNED, 1,         "Exif.Image.ExifTag",           N_("SubIFD Exif offset"), NULL },
 342         /* subIFD follows */
 343 { 0x829a, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.ExposureTime",      N_("Exposure time (seconds)"), NULL },
 344 { 0x829d, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.FNumber",           N_("FNumber"), NULL },
 345 { 0x8822, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Photo.ExposureProgram",   N_("Exposure program"), ExifExposureProgramList },
 346 { 0x8824, EXIF_FORMAT_STRING, -1,               "Exif.Photo.SpectralSensitivity",N_("Spectral Sensitivity"), NULL },
 347 { 0x8827, EXIF_FORMAT_SHORT_UNSIGNED, -1,       "Exif.Photo.ISOSpeedRatings",   N_("ISO sensitivity"), NULL },
 348 { 0x8828, EXIF_FORMAT_UNDEFINED, -1,            "Exif.Photo.OECF",              N_("Optoelectric conversion factor"), NULL },
 349 { 0x9000, EXIF_FORMAT_UNDEFINED, 4,             "Exif.Photo.ExifVersion",       N_("Exif version"), NULL },
 350 { 0x9003, EXIF_FORMAT_STRING, 20,               "Exif.Photo.DateTimeOriginal",  N_("Date original"), NULL },
 351 { 0x9004, EXIF_FORMAT_STRING, 20,               "Exif.Photo.DateTimeDigitized", N_("Date digitized"), NULL },
 352 { 0x9101, EXIF_FORMAT_UNDEFINED, -1,            "Exif.Photo.ComponentsConfiguration",N_("Pixel format"), NULL },
 353 { 0x9102, EXIF_FORMAT_RATIONAL_UNSIGNED,1,      "Exif.Photo.CompressedBitsPerPixel",N_("Compression ratio"), NULL },
 354 { 0x9201, EXIF_FORMAT_RATIONAL, 1,              "Exif.Photo.ShutterSpeedValue", N_("Shutter speed"), NULL },
 355 { 0x9202, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.ApertureValue",     N_("Aperture"), NULL },
 356 { 0x9203, EXIF_FORMAT_RATIONAL, 1,              "Exif.Photo.BrightnessValue",   N_("Brightness"), NULL },
 357 { 0x9204, EXIF_FORMAT_RATIONAL, 1,              "Exif.Photo.ExposureBiasValue", N_("Exposure bias"), NULL },
 358 { 0x9205, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.MaxApertureValue",  N_("Maximum aperture"), NULL },
 359 { 0x9206, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.SubjectDistance",   N_("Subject distance"), NULL },
 360 { 0x9207, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Photo.MeteringMode",      N_("Metering mode"), ExifMeteringModeList },
 361 { 0x9208, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Photo.LightSource",       N_("Light source"), ExifLightSourceList },
 362 { 0x9209, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Photo.Flash",             N_("Flash"), ExifFlashList },
 363 { 0x920a, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.FocalLength",       N_("Focal length"), NULL },
 364 { 0x9214, EXIF_FORMAT_SHORT_UNSIGNED, -1,       "Exif.Photo.SubjectArea",       N_("Subject area"), NULL },
 365 { 0x927c, EXIF_FORMAT_UNDEFINED, -1,            "Exif.Photo.MakerNote",         N_("MakerNote"), NULL },
 366 { 0x9286, EXIF_FORMAT_UNDEFINED, -1,            "Exif.Photo.UserComment",       N_("UserComment"), NULL },
 367 { 0x9290, EXIF_FORMAT_STRING, -1,               "Exif.Photo.SubSecTime",        N_("Subsecond time"), NULL },
 368 { 0x9291, EXIF_FORMAT_STRING, -1,               "Exif.Photo.SubSecTimeOriginal",N_("Subsecond time original"), NULL },
 369 { 0x9292, EXIF_FORMAT_STRING, -1,               "Exif.Photo.SubSecTimeDigitized",N_("Subsecond time digitized"), NULL },
 370 { 0xa000, EXIF_FORMAT_UNDEFINED, 4,             "Exif.Photo.FlashpixVersion",   N_("FlashPix version"), NULL },
 371 { 0xa001, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Photo.ColorSpace",        N_("Colorspace"), ExifColorSpaceList },
 372         /* ExifImageWidth, ExifImageHeight can also be unsigned short */
 373 { 0xa002, EXIF_FORMAT_LONG_UNSIGNED, 1,         "Exif.Photo.PixelXDimension",   N_("Width"), NULL },
 374 { 0xa003, EXIF_FORMAT_LONG_UNSIGNED, 1,         "Exif.Photo.PixelYDimension",   N_("Height"), NULL },
 375 { 0xa004, EXIF_FORMAT_STRING, -1,               "Exif.Photo.RelatedSoundFile",  N_("Audio data"), NULL },
 376 { 0xa005, EXIF_FORMAT_LONG_UNSIGNED, 1,         "ExifInteroperabilityOffset",   N_("ExifR98 extension"), NULL },
 377 { 0xa20b, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.FlashEnergy",       N_("Flash strength"), NULL },
 378 { 0xa20c, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Photo.SpatialFrequencyResponse",N_("Spatial frequency response"), NULL },
 379 { 0xa20e, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.FocalPlaneXResolution", N_("X Pixel density"), NULL },
 380 { 0xa20f, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.FocalPlaneYResolution", N_("Y Pixel density"), NULL },
 381 { 0xa210, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Photo.FocalPlaneResolutionUnit", N_("Pixel density units"), ExifUnitList },
 382 { 0x0214, EXIF_FORMAT_SHORT_UNSIGNED, 2,        "Exif.Photo.SubjectLocation",   N_("Subject location"), NULL },
 383 { 0xa215, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.ExposureIndex",     N_("ISO sensitivity"), NULL },
 384 { 0xa217, EXIF_FORMAT_SHORT_UNSIGNED, -1,       "Exif.Photo.SensingMethod",     N_("Sensor type"), ExifSensorList },
 385 { 0xa300, EXIF_FORMAT_UNDEFINED, 1,             "Exif.Photo.FileSource",        N_("Source type"), ExifSourceList },
 386 { 0xa301, EXIF_FORMAT_UNDEFINED, 1,             "Exif.Photo.SceneType",         N_("Scene type"), ExifSceneList },
 387 { 0xa302, EXIF_FORMAT_UNDEFINED, -1,            "Exif.Image.CFAPattern",        N_("Color filter array pattern"), NULL },
 388         /* tags a4xx were added for Exif 2.2 (not just these - some above, as well) */
 389 { 0xa401, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Photo.CustomRendered",    N_("Render process"), ExifCustRenderList },
 390 { 0xa402, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Photo.ExposureMode",      N_("Exposure mode"), ExifExposureModeList },
 391 { 0xa403, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Photo.WhiteBalance",      N_("White balance"), ExifWhiteBalanceList },
 392 { 0xa404, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.DigitalZoomRatio",  N_("Digital zoom ratio"), NULL },
 393 { 0xa405, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Photo.FocalLengthIn35mmFilm",N_("Focal length (35mm)"), NULL },
 394 { 0xa406, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Photo.SceneCaptureType",  N_("Scene capture type"), ExifSceneCaptureList },
 395 { 0xa407, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Photo.GainControl",       N_("Gain control"), ExifGainControlList },
 396 { 0xa408, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Photo.Contrast",          N_("Contrast"), ExifContrastList },
 397 { 0xa409, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Photo.Saturation",        N_("Saturation"), ExifSaturationList },
 398 { 0xa40a, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Photo.Sharpness",         N_("Sharpness"), ExifSharpnessList },
 399 { 0xa40b, EXIF_FORMAT_UNDEFINED, -1,            "Exif.Photo.DeviceSettingDescription",N_("Device setting"), NULL },
 400 { 0xa40c, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Photo.SubjectDistanceRange",N_("Subject range"), ExifSubjectRangeList },
 401 { 0xa420, EXIF_FORMAT_STRING, -1,               "Exif.Photo.ImageUniqueID",     N_("Image serial number"), NULL },
 402         /* place known, but undocumented or lesser used tags here */
 403 { 0x00fe, EXIF_FORMAT_LONG_UNSIGNED, 1,         "Exif.Image.NewSubfileType",    NULL, NULL },
 404 { 0x00ff, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "SubfileType",                  NULL, NULL },
 405 { 0x012d, EXIF_FORMAT_SHORT_UNSIGNED, 3,        "Exif.Image.TransferFunction",  NULL, NULL },
 406 { 0x013b, EXIF_FORMAT_STRING, -1,               "Exif.Image.Artist",            "Artist", NULL },
 407 { 0x013d, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Predictor",            NULL, NULL },
 408 { 0x0142, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "TileWidth",            NULL, NULL },
 409 { 0x0143, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "TileLength",           NULL, NULL },
 410 { 0x0144, EXIF_FORMAT_LONG_UNSIGNED, -1,        "TileOffsets",          NULL, NULL },
 411 { 0x0145, EXIF_FORMAT_SHORT_UNSIGNED, -1,       "TileByteCounts",       NULL, NULL },
 412 { 0x014a, EXIF_FORMAT_LONG_UNSIGNED, -1,        "Exif.Image.SubIFDs",           NULL, NULL },
 413 { 0x015b, EXIF_FORMAT_UNDEFINED, -1,            "JPEGTables",           NULL, NULL },
 414 { 0x828d, EXIF_FORMAT_SHORT_UNSIGNED, 2,        "Exif.Image.CFARepeatPatternDim",       NULL, NULL },
 415 { 0x828e, EXIF_FORMAT_BYTE_UNSIGNED, -1,        "Exif.Image.CFAPattern",                NULL, NULL },
 416 { 0x828f, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Image.BatteryLevel",              NULL, NULL },
 417 { 0x83bb, EXIF_FORMAT_LONG_UNSIGNED, -1,        "IPTC/NAA",             NULL, NULL },
 418 { 0x8773, EXIF_FORMAT_UNDEFINED, -1,            "Exif.Image.InterColorProfile",         NULL, NULL },
 419 { 0x8825, EXIF_FORMAT_LONG_UNSIGNED, 1,         "GPSInfo",              "SubIFD GPS offset", NULL },
 420 { 0x8829, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Interlace",            NULL, NULL },
 421 { 0x882a, EXIF_FORMAT_SHORT, 1,                 "TimeZoneOffset",       NULL, NULL },
 422 { 0x882b, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "SelfTimerMode",        NULL, NULL },
 423 { 0x920b, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.FlashEnergy",               NULL, NULL },
 424 { 0x920c, EXIF_FORMAT_UNDEFINED, -1,            "Exif.Photo.SpatialFrequencyResponse", NULL, NULL },
 425 { 0x920d, EXIF_FORMAT_UNDEFINED, -1,            "Noise",                NULL, NULL },
 426 { 0x9211, EXIF_FORMAT_LONG_UNSIGNED, 1,         "ImageNumber",          NULL, NULL },
 427 { 0x9212, EXIF_FORMAT_STRING, 1,                "SecurityClassification", NULL, NULL },
 428 { 0x9213, EXIF_FORMAT_STRING, -1,               "ImageHistory",         NULL, NULL },
 429 { 0x9215, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.ExposureIndex",     NULL, NULL },
 430 { 0x9216, EXIF_FORMAT_BYTE_UNSIGNED, 4,         "TIFF/EPStandardID",    NULL, NULL },
 431
 432 EXIF_MARKER_LIST_END
 433 };
 434
 435 ExifMarker ExifKnownGPSInfoMarkersList[] = {
 436         /* The following do not work at the moment as the tag value 0x0000 has a
 437          * special meaning. */
 438         /* { 0x0000, EXIF_FORMAT_BYTE, -1, "Exif.GPSInfo.GPSVersionID", NULL, NULL }, */
 439         { 0x0001, EXIF_FORMAT_STRING, 2, "Exif.GPSInfo.GPSLatitudeRef", NULL, NULL },
 440         { 0x0002, EXIF_FORMAT_RATIONAL_UNSIGNED, 3, "Exif.GPSInfo.GPSLatitude", NULL, NULL },
 441         { 0x0003, EXIF_FORMAT_STRING, 2, "Exif.GPSInfo.GPSLongitudeRef", NULL, NULL },
 442         { 0x0004, EXIF_FORMAT_RATIONAL_UNSIGNED, 3, "Exif.GPSInfo.GPSLongitude", NULL, NULL },
 443         { 0x0005, EXIF_FORMAT_BYTE_UNSIGNED, 1, "Exif.GPSInfo.GPSAltitudeRef", NULL, NULL },
 444         { 0x0006, EXIF_FORMAT_RATIONAL_UNSIGNED, 1, "Exif.GPSInfo.GPSAltitude", NULL, NULL },
 445         { 0x0007, EXIF_FORMAT_RATIONAL_UNSIGNED, 3, "Exif.GPSInfo.GPSTimeStamp", NULL, NULL },
 446         { 0x0008, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSSatellites", NULL, NULL },
 447         { 0x0009, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSStatus", NULL, NULL },
 448         { 0x000a, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSMeasureMode", NULL, NULL },
 449         { 0x000b, EXIF_FORMAT_RATIONAL_UNSIGNED, -1, "Exif.GPSInfo.GPSDOP", NULL, NULL },
 450         { 0x000c, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSSpeedRef", NULL, NULL },
 451         { 0x000d, EXIF_FORMAT_RATIONAL_UNSIGNED, -1, "Exif.GPSInfo.GPSSpeed", NULL, NULL },
 452         { 0x000e, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSTrackRef", NULL, NULL },
 453         { 0x000f, EXIF_FORMAT_RATIONAL_UNSIGNED, -1, "Exif.GPSInfo.GPSTrack", NULL, NULL },
 454         { 0x0010, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSImgDirectionRef", NULL, NULL },
 455         { 0x0011, EXIF_FORMAT_RATIONAL_UNSIGNED, -1, "Exif.GPSInfo.GPSImgDirection", NULL, NULL },
 456         { 0x0012, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSMapDatum", NULL, NULL },
 457         { 0x0013, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSDestLatitudeRef", NULL, NULL },
 458         { 0x0014, EXIF_FORMAT_RATIONAL_UNSIGNED, -1, "Exif.GPSInfo.GPSDestLatitude", NULL, NULL },
 459         { 0x0015, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSDestLongitudeRef", NULL, NULL },
 460         { 0x0016, EXIF_FORMAT_RATIONAL_UNSIGNED, -1, "Exif.GPSInfo.GPSDestLongitude", NULL, NULL },
 461         { 0x0017, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSDestBearingRef", NULL, NULL },
 462         { 0x0018, EXIF_FORMAT_RATIONAL_UNSIGNED, -1, "Exif.GPSInfo.GPSDestBearing", NULL, NULL },
 463         { 0x0019, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSDestDistanceRef", NULL, NULL },
 464         { 0x001a, EXIF_FORMAT_RATIONAL_UNSIGNED, -1, "Exif.GPSInfo.GPSDestDistance", NULL, NULL },
 465         { 0x001b, EXIF_FORMAT_UNDEFINED, -1, "Exif.GPSInfo.GPSProcessingMethod", NULL, NULL },
 466         { 0x001c, EXIF_FORMAT_UNDEFINED, -1, "Exif.GPSInfo.GPSAreaInformation", NULL, NULL },
 467         { 0x001d, EXIF_FORMAT_RATIONAL_UNSIGNED, 3, "Exif.GPSInfo.GPSDateStamp", NULL, NULL },
 468         { 0x001e, EXIF_FORMAT_SHORT, -1, "Exif.GPSInfo.GPSDifferential", NULL, NULL },
 469
 470         EXIF_MARKER_LIST_END
 471 };
 472
 473 ExifMarker ExifUnknownMarkersList[] = {
 474 { 0x0000, EXIF_FORMAT_UNKNOWN, 0,               "unknown",      NULL, NULL },
 475 { 0x0000, EXIF_FORMAT_BYTE_UNSIGNED, -1,        "unknown",      NULL, NULL },
 476 { 0x0000, EXIF_FORMAT_STRING, -1,               "unknown",      NULL, NULL },
 477 { 0x0000, EXIF_FORMAT_SHORT_UNSIGNED, -1,       "unknown",      NULL, NULL },
 478 { 0x0000, EXIF_FORMAT_LONG_UNSIGNED, -1,        "unknown",      NULL, NULL },
 479 { 0x0000, EXIF_FORMAT_RATIONAL_UNSIGNED, -1,    "unknown",      NULL, NULL },
 480 { 0x0000, EXIF_FORMAT_BYTE, -1,                 "unknown",      NULL, NULL },
 481 { 0x0000, EXIF_FORMAT_UNDEFINED, -1,            "unknown",      NULL, NULL },
 482 { 0x0000, EXIF_FORMAT_SHORT, -1,                "unknown",      NULL, NULL },
 483 { 0x0000, EXIF_FORMAT_LONG, -1,                 "unknown",      NULL, NULL },
 484 { 0x0000, EXIF_FORMAT_RATIONAL, -1,             "unknown",      NULL, NULL },
 485 { 0x0000, EXIF_FORMAT_FLOAT, -1,                "unknown",      NULL, NULL },
 486 { 0x0000, EXIF_FORMAT_DOUBLE, -1,               "unknown",      NULL, NULL },
 487 };
 488
 489 static const ExifMarker *exif_marker_from_tag(guint16 tag, const ExifMarker *list);
 490
 491 /*
 492  *-----------------------------------------------------------------------------
 493  * ExifItem
 494  *-----------------------------------------------------------------------------
 495  */
 496
 497 ExifItem *exif_item_new(ExifFormatType format, guint tag,
 498                         guint elements, const ExifMarker *marker)
 499 {
 500         ExifItem *item;
 501
 502         item = g_new0(ExifItem, 1);
 503         item->format = format;
 504         item->tag = tag;
 505         item->marker = marker;
 506         item->elements = elements;
 507
 508         switch (format)
 509                 {
 510                 case EXIF_FORMAT_UNKNOWN:
 511                         /* unknown, data is NULL */
 512                         return item;
 513                         break;
 514                 case EXIF_FORMAT_BYTE_UNSIGNED:
 515                         item->data_len = sizeof(gchar) * elements;
 516                         break;
 517                 case EXIF_FORMAT_STRING:
 518                         item->data_len = sizeof(gchar) * elements;
 519                         break;
 520                 case EXIF_FORMAT_SHORT_UNSIGNED:
 521                         item->data_len = sizeof(guint16) * elements;
 522                         break;
 523                 case EXIF_FORMAT_LONG_UNSIGNED:
 524                         item->data_len = sizeof(guint32) * elements;
 525                         break;
 526                 case EXIF_FORMAT_RATIONAL_UNSIGNED:
 527                         item->data_len = sizeof(ExifRational) * elements;
 528                         break;
 529                 case EXIF_FORMAT_BYTE:
 530                         item->data_len = sizeof(gchar) * elements;
 531                         break;
 532                 case EXIF_FORMAT_UNDEFINED:
 533                         item->data_len = sizeof(gchar) * elements;
 534                         break;
 535                 case EXIF_FORMAT_SHORT:
 536                         item->data_len = sizeof(gint16) * elements;
 537                         break;
 538                 case EXIF_FORMAT_LONG:
 539                         item->data_len = sizeof(gint32) * elements;
 540                         break;
 541                 case EXIF_FORMAT_RATIONAL:
 542                         item->data_len = sizeof(ExifRational) * elements;
 543                         break;
 544                 case EXIF_FORMAT_FLOAT:
 545                         item->data_len = sizeof(float) * elements;
 546                         break;
 547                 case EXIF_FORMAT_DOUBLE:
 548                         item->data_len = sizeof(gdouble) * elements;
 549                         break;
 550                 }
 551
 552         item->data = g_malloc0(item->data_len);
 553
 554         return item;
 555 }
 556
 557 static void exif_item_free(ExifItem *item)
 558 {
 559         if (!item) return;
 560
 561         g_free(item->data);
 562         g_free(item);
 563 }
 564
 565 gchar *exif_item_get_tag_name(ExifItem *item)
 566 {
 567         if (!item || !item->marker) return NULL;
 568         return g_strdup(item->marker->key);
 569 }
 570
 571 guint exif_item_get_tag_id(ExifItem *item)
 572 {
 573         if (!item) return 0;
 574         return item->tag;
 575 }
 576
 577 guint exif_item_get_elements(ExifItem *item)
 578 {
 579         if (!item) return 0;
 580         return item->elements;
 581 }
 582
 583 gchar *exif_item_get_data(ExifItem *item, guint *data_len)
 584 {
 585         if (data_len)
 586                 *data_len = item->data_len;
 587         return g_memdup(item->data, item->data_len);
 588 }
 589
 590 guint exif_item_get_format_id(ExifItem *item)
 591 {
 592         if (!item) return EXIF_FORMAT_UNKNOWN;
 593         return item->format;
 594 }
 595
 596
 597 gchar *exif_item_get_description(ExifItem *item)
 598 {
 599         if (!item || !item->marker) return NULL;
 600         return g_strdup(_(item->marker->description));
 601 }
 602
 603 const gchar *exif_item_get_format_name(ExifItem *item, gboolean brief)
 604 {
 605         if (!item || !item->marker) return NULL;
 606         return (brief) ? ExifFormatList[item->format].short_name : ExifFormatList[item->format].description;
 607 }
 608
 609 static GString *string_append_raw_bytes(GString *string, gpointer data, gint ne)
 610 {
 611         gint i;
 612
 613         for (i = 0 ; i < ne; i++)
 614                 {
 615                 guchar c = ((gchar *)data)[i];
 616                 if (c < 32 || c > 127) c = '.';
 617                 g_string_append_printf(string, "%c", c);
 618                 }
 619         string = g_string_append(string, " : ");
 620         for (i = 0 ; i < ne; i++)
 621                 {
 622                 const gchar *spacer;
 623                 if (i > 0)
 624                         {
 625                         if (i%8 == 0)
 626                                 {
 627                                 spacer = " - ";
 628                                 }
 629                         else
 630                                 {
 631                                 spacer = " ";
 632                                 }
 633                         }
 634                 else
 635                         {
 636                         spacer = "";
 637                         }
 638                 g_string_append_printf(string, "%s%02x", spacer, ((gchar *)data)[i]);
 639                 }
 640
 641         return string;
 642 }
 643
 644
 645 gchar *exif_text_list_find_value(ExifTextList *list, guint value)
 646 {
 647         gchar *result = NULL;
 648         gint i;
 649
 650         i = 0;
 651         while (!result && list[i].value >= 0)
 652                 {
 653                 if (value == (guint) list[i].value) result = g_strdup(_(list[i].description));
 654                 i++;
 655                 }
 656         if (!result) result = g_strdup_printf("%d (%s)", value, _("unknown"));
 657
 658         return result;
 659 }
 660
 661
 662 /*
 663  *-------------------------------------------------------------------
 664  * byte order utils
 665  *-------------------------------------------------------------------
 666  */
 667
 668 /* note: the align_buf is used to avoid alignment issues (on sparc) */
 669
 670 guint16 exif_byte_get_int16(guchar *f, ExifByteOrder bo)
 671 {
 672         guint16 align_buf;
 673
 674         memcpy(&align_buf, f, sizeof(guint16));
 675
 676         if (bo == EXIF_BYTE_ORDER_INTEL)
 677                 return GUINT16_FROM_LE(align_buf);
 678         else
 679                 return GUINT16_FROM_BE(align_buf);
 680 }
 681
 682 guint32 exif_byte_get_int32(guchar *f, ExifByteOrder bo)
 683 {
 684         guint32 align_buf;
 685
 686         memcpy(&align_buf, f, sizeof(guint32));
 687
 688         if (bo == EXIF_BYTE_ORDER_INTEL)
 689                 return GUINT32_FROM_LE(align_buf);
 690         else
 691                 return GUINT32_FROM_BE(align_buf);
 692 }
 693
 694 void exif_byte_put_int16(guchar *f, guint16 n, ExifByteOrder bo)
 695 {
 696         guint16 align_buf;
 697
 698         if (bo == EXIF_BYTE_ORDER_INTEL)
 699                 {
 700                 align_buf = GUINT16_TO_LE(n);
 701                 }
 702         else
 703                 {
 704                 align_buf = GUINT16_TO_BE(n);
 705                 }
 706
 707         memcpy(f, &align_buf, sizeof(guint16));
 708 }
 709
 710 void exif_byte_put_int32(guchar *f, guint32 n, ExifByteOrder bo)
 711 {
 712         guint32 align_buf;
 713
 714         if (bo == EXIF_BYTE_ORDER_INTEL)
 715                 {
 716                 align_buf = GUINT32_TO_LE(n);
 717                 }
 718         else
 719                 {
 720                 align_buf = GUINT32_TO_BE(n);
 721                 }
 722
 723         memcpy(f, &align_buf, sizeof(guint32));
 724 }
 725
 726
 727 /*
 728  *-------------------------------------------------------------------
 729  * IFD utils
 730  *-------------------------------------------------------------------
 731  */
 732
 733 static const ExifMarker *exif_marker_from_tag(guint16 tag, const ExifMarker *list)
 734 {
 735         gint i = 0;
 736
 737         if (!list) return NULL;
 738
 739         while (list[i].tag != 0 && list[i].tag != tag)
 740                 {
 741                 i++;
 742                 }
 743
 744         return (list[i].tag == 0 ? NULL : &list[i]);
 745 }
 746
 747 static void rational_from_data(ExifRational *r, gpointer src, ExifByteOrder bo)
 748 {
 749         r->num = exif_byte_get_int32(src, bo);
 750         r->den = exif_byte_get_int32(src + sizeof(guint32), bo);
 751 }
 752
 753 /* src_format and item->format must be compatible
 754  * and not overrun src or item->data.
 755  */
 756 void exif_item_copy_data(ExifItem *item, gpointer src, guint len,
 757                          ExifFormatType src_format, ExifByteOrder bo)
 758 {
 759         gint bs;
 760         gint ne;
 761         gpointer dest;
 762         gint i;
 763
 764         bs = ExifFormatList[item->format].size;
 765         ne = item->elements;
 766         dest = item->data;
 767
 768         if (!dest ||
 769             ExifFormatList[src_format].size * ne > len)
 770                 {
 771                 gchar *tag = exif_item_get_tag_name(item);
 772                 log_printf("exif tag %s data size mismatch\n", tag);
 773                 g_free(tag);
 774                 return;
 775                 }
 776
 777         switch (item->format)
 778                 {
 779                 case EXIF_FORMAT_UNKNOWN:
 780                         break;
 781                 case EXIF_FORMAT_BYTE_UNSIGNED:
 782                 case EXIF_FORMAT_BYTE:
 783                 case EXIF_FORMAT_UNDEFINED:
 784                         memcpy(dest, src, len);
 785                         break;
 786                 case EXIF_FORMAT_STRING:
 787                         memcpy(dest, src, len);
 788                         /* string is NULL terminated, make sure this is true */
 789                         if (((gchar *)dest)[len - 1] != '\0') ((gchar *)dest)[len - 1] = '\0';
 790                         break;
 791                 case EXIF_FORMAT_SHORT_UNSIGNED:
 792                 case EXIF_FORMAT_SHORT:
 793                         for (i = 0; i < ne; i++)
 794                                 {
 795                                 ((guint16 *)dest)[i] = exif_byte_get_int16(src + i * bs, bo);
 796                                 }
 797                         break;
 798                 case EXIF_FORMAT_LONG_UNSIGNED:
 799                 case EXIF_FORMAT_LONG:
 800                         if (src_format == EXIF_FORMAT_SHORT_UNSIGNED ||
 801                             src_format == EXIF_FORMAT_SHORT)
 802                                 {
 803                                 /* a short fits into a long, so allow it */
 804                                 gint ss;
 805
 806                                 ss = ExifFormatList[src_format].size;
 807                                 for (i = 0; i < ne; i++)
 808                                         {
 809                                         ((gint32 *)dest)[i] =
 810                                                 (gint32)exif_byte_get_int16(src + i * ss, bo);
 811                                         }
 812                                 }
 813                         else
 814                                 {
 815                                 for (i = 0; i < ne; i++)
 816                                         {
 817                                         ((gint32 *)dest)[i] =
 818                                                 exif_byte_get_int32(src + i * bs, bo);
 819                                         }
 820                                 }
 821                         break;
 822                 case EXIF_FORMAT_RATIONAL_UNSIGNED:
 823                 case EXIF_FORMAT_RATIONAL:
 824                         for (i = 0; i < ne; i++)
 825                                 {
 826                                 rational_from_data(&((ExifRational *)dest)[i], src + i * bs, bo);
 827                                 }
 828                         break;
 829                 case EXIF_FORMAT_FLOAT:
 830                         for (i = 0; i < ne; i++)
 831                                 {
 832                                 ((float *)dest)[i] = exif_byte_get_int32(src + i * bs, bo);
 833                                 }
 834                         break;
 835                 case EXIF_FORMAT_DOUBLE:
 836                         for (i = 0; i < ne; i++)
 837                                 {
 838                                 ExifRational r;
 839
 840                                 rational_from_data(&r, src + i * bs, bo);
 841                                 if (r.den) ((gdouble *)dest)[i] = (gdouble)r.num / r.den;
 842                                 }
 843                         break;
 844                 }
 845 }
 846
 847 static gint exif_parse_IFD_entry(ExifData *exif, guchar *tiff, guint offset,
 848                                  guint size, ExifByteOrder bo,
 849                                  gint level,
 850                                  const ExifMarker *list)
 851 {
 852         guint tag;
 853         guint format;
 854         guint count;
 855         guint data_val;
 856         guint data_offset;
 857         guint data_length;
 858         const ExifMarker *marker;
 859         ExifItem *item;
 860
 861         tag = exif_byte_get_int16(tiff + offset + EXIF_TIFD_OFFSET_TAG, bo);
 862         format = exif_byte_get_int16(tiff + offset + EXIF_TIFD_OFFSET_FORMAT, bo);
 863         count = exif_byte_get_int32(tiff + offset + EXIF_TIFD_OFFSET_COUNT, bo);
 864         data_val = exif_byte_get_int32(tiff + offset + EXIF_TIFD_OFFSET_DATA, bo);
 865
 866         /* Check tag type. If it does not match, either the format is wrong,
 867          * either it is a unknown tag; so it is not really an error.
 868          */
 869         marker = exif_marker_from_tag(tag, list);
 870         if (!marker)
 871                 {
 872                 if (format >= EXIF_FORMAT_COUNT)
 873                         {
 874                         log_printf("warning: exif tag 0x%4x has invalid format %d\n", tag, format);
 875                         return 0;
 876                         }
 877                 /* allow non recognized tags to be displayed */
 878                 marker = &ExifUnknownMarkersList[format];
 879                 }
 880         if (marker->format != format)
 881                 {
 882                 /* Some cameras got mixed up signed/unsigned_rational
 883                  * eg KODAK DC4800 on object_distance tag
 884                  *
 885                  * FIXME: what exactly is this test trying to do?
 886                  * ok, so this test is to allow the case of swapped signed/unsigned mismatch to leak through?
 887                  */
 888                 if (!(marker->format == EXIF_FORMAT_RATIONAL_UNSIGNED && format == EXIF_FORMAT_RATIONAL) &&
 889                     !(marker->format == EXIF_FORMAT_RATIONAL && format == EXIF_FORMAT_RATIONAL_UNSIGNED) &&
 890                         /* short fits into a long so allow this mismatch
 891                          * as well (some tags allowed to be unsigned short _or_ unsigned long)
 892                          */
 893                     !(marker->format == EXIF_FORMAT_LONG_UNSIGNED && format == EXIF_FORMAT_SHORT_UNSIGNED) )
 894                         {
 895                         if (format < EXIF_FORMAT_COUNT)
 896                                 {
 897                                 log_printf("warning: exif tag %s format mismatch, found %s exif spec requests %s\n",
 898                                         marker->key, ExifFormatList[format].short_name,
 899                                         ExifFormatList[marker->format].short_name);
 900                                 }
 901                         else
 902                                 {
 903                                 log_printf("warning: exif tag %s format mismatch, found unknown id %d exif spec requests %d (%s)\n",
 904                                         marker->key, format, marker->format,
 905                                         ExifFormatList[marker->format].short_name);
 906                                 }
 907                         return 0;
 908                         }
 909                 }
 910
 911         /* Where is the data, is it available?
 912          */
 913         if (marker->components > 0 && (guint) marker->components != count)
 914                 {
 915                 log_printf("warning: exif tag %s has %d elements, exif spec requests %d\n",
 916                         marker->key, count, marker->components);
 917                 }
 918
 919         data_length = ExifFormatList[marker->format].size * count;
 920         if (data_length > 4)
 921                 {
 922                 data_offset = data_val;
 923                 if (size < data_offset || size < data_offset + data_length)
 924                         {
 925                         log_printf("warning: exif tag %s data will overrun end of file, ignored.\n", marker->key);
 926                         return -1;
 927                         }
 928                 }
 929         else
 930                 {
 931                 data_offset = offset + EXIF_TIFD_OFFSET_DATA;
 932                 }
 933
 934         item = exif_item_new(marker->format, tag, count, marker);
 935         exif_item_copy_data(item, tiff + data_offset, data_length, format, bo);
 936         exif->items = g_list_prepend(exif->items, item);
 937
 938         if (list == ExifKnownMarkersList)
 939                 {
 940                 switch (item->tag)
 941                         {
 942                         case TAG_EXIFOFFSET:
 943                                 exif_parse_IFD_table(exif, tiff, data_val, size, bo, level + 1, list);
 944                                 break;
 945                         case TAG_GPSOFFSET:
 946                                 exif_parse_IFD_table(exif, tiff, data_val, size, bo, level + 1, ExifKnownGPSInfoMarkersList);
 947                                 break;
 948                         case TAG_EXIFMAKERNOTE:
 949                                 format_exif_makernote_parse(exif, tiff, data_val, size, bo);
 950                                 break;
 951                         }
 952                 }
 953
 954         return 0;
 955 }
 956
 957 gint exif_parse_IFD_table(ExifData *exif,
 958                           guchar *tiff, guint offset,
 959                           guint size, ExifByteOrder bo,
 960                           gint level,
 961                           const ExifMarker *list)
 962 {
 963         guint count;
 964         guint i;
 965
 966         /* limit damage from infinite loops */
 967         if (level > EXIF_TIFF_MAX_LEVELS) return -1;
 968
 969         /* We should be able to read number of entries in IFD0) */
 970         if (size < offset + 2) return -1;
 971
 972         count = exif_byte_get_int16(tiff + offset, bo);
 973         offset += 2;
 974
 975         /* Entries and next IFD offset must be readable */
 976         if (size < offset + count * EXIF_TIFD_SIZE + 4) return -1;
 977
 978         for (i = 0; i < count; i++)
 979                 {
 980                 exif_parse_IFD_entry(exif, tiff, offset + i * EXIF_TIFD_SIZE, size, bo, level, list);
 981                 }
 982
 983         return 0;
 984 }
 985
 986 /*
 987  *-------------------------------------------------------------------
 988  * file formats
 989  *-------------------------------------------------------------------
 990  */
 991
 992 gint exif_tiff_directory_offset(guchar *data, const guint len,
 993                                 guint *offset, ExifByteOrder *bo)
 994 {
 995         if (len < 8) return FALSE;
 996
 997         if (memcmp(data, "II", 2) == 0)
 998                 {
 999                 *bo = EXIF_BYTE_ORDER_INTEL;
1000                 }
1001         else if (memcmp(data, "MM", 2) == 0)
1002                 {
1003                 *bo = EXIF_BYTE_ORDER_MOTOROLA;
1004                 }
1005         else
1006                 {
1007                 return FALSE;
1008                 }
1009
1010         if (exif_byte_get_int16(data + 2, *bo) != 0x002A)
1011                 {
1012                 return FALSE;
1013                 }
1014
1015         *offset = exif_byte_get_int32(data + 4, *bo);
1016
1017         return (*offset < len);
1018 }
1019
1020 gint exif_tiff_parse(ExifData *exif, guchar *tiff, guint size, ExifMarker *list)
1021 {
1022         ExifByteOrder bo;
1023         guint offset;
1024
1025         if (!exif_tiff_directory_offset(tiff, size, &offset, &bo)) return -1;
1026
1027         return exif_parse_IFD_table(exif, tiff, offset, size, bo, 0, list);
1028 }
1029
1030
1031 /*
1032  *-------------------------------------------------------------------
1033  * jpeg marker utils
1034  *-------------------------------------------------------------------
1035  */
1036
1037 #define JPEG_MARKER             0xFF
1038 #define JPEG_MARKER_SOI         0xD8
1039 #define JPEG_MARKER_EOI         0xD9
1040 #define JPEG_MARKER_APP1        0xE1
1041 #define JPEG_MARKER_APP2        0xE2
1042
1043 /* jpeg container format:
1044      all data markers start with 0XFF
1045      2 byte long file start and end markers: 0xFFD8(SOI) and 0XFFD9(EOI)
1046      4 byte long data segment markers in format: 0xFFTTSSSSNNN...
1047        FF:   1 byte standard marker identifier
1048        TT:   1 byte data type
1049        SSSS: 2 bytes in Motorola byte alignment for length of the data.
1050              This value includes these 2 bytes in the count, making actual
1051              length of NN... == SSSS - 2.
1052        NNN.: the data in this segment
1053  */
1054 static ExifMarker jpeg_color_marker = { 0x8773, EXIF_FORMAT_UNDEFINED, -1, "Exif.Image.InterColorProfile", NULL, NULL };
1055
1056 void exif_add_jpeg_color_profile(ExifData *exif, guchar *cp_data, guint cp_length)
1057 {
1058         ExifItem *item = exif_item_new(jpeg_color_marker.format, jpeg_color_marker.tag, 1,
1059                                      &jpeg_color_marker);
1060         g_free(item->data);
1061         item->data = cp_data;
1062         item->elements = cp_length;
1063         item->data_len = cp_length;
1064         exif->items = g_list_prepend(exif->items, item);
1065
1066 }
1067
1068 static gint exif_jpeg_parse(ExifData *exif,
1069                             guchar *data, guint size,
1070                             ExifMarker *list)
1071 {
1072         guint seg_offset = 0;
1073         guint seg_length = 0;
1074         gint res = -1;
1075
1076         if (size < 4 ||
1077             memcmp(data, "\xFF\xD8", 2) != 0)
1078                 {
1079                 return -2;
1080                 }
1081
1082         if (jpeg_segment_find(data, size, JPEG_MARKER_APP1,
1083                                    "Exif\x00\x00", 6,
1084                                    &seg_offset, &seg_length))
1085                 {
1086                 res = exif_tiff_parse(exif, data + seg_offset + 6, seg_length - 6, list);
1087                 }
1088
1089         if (exif_jpeg_parse_color(exif, data, size))
1090                 {
1091                 res = 0;
1092                 }
1093
1094         return res;
1095 }
1096
1097 guchar *exif_get_color_profile(ExifData *exif, guint *data_len)
1098 {
1099         ExifItem *prof_item = exif_get_item(exif, "Exif.Image.InterColorProfile");
1100         if (prof_item && exif_item_get_format_id(prof_item) == EXIF_FORMAT_UNDEFINED)
1101                 return (guchar *) exif_item_get_data(prof_item, data_len);
1102         return NULL;
1103 }
1104
1105
1106 gchar* exif_get_image_comment(FileData* fd)
1107 {
1108         log_printf("%s", _("Can't get image comment: not compiled with Exiv2.\n"));
1109         return g_strdup("");
1110 }
1111
1112 void exif_set_image_comment(FileData* fd, const gchar* comment)
1113 {
1114         log_printf("%s", _("Can't set image comment: not compiled with Exiv2.\n"));
1115 }
1116
1117
1118 /*
1119  *-------------------------------------------------------------------
1120  * misc
1121  *-------------------------------------------------------------------
1122  */
1123
1124
1125 ExifItem *exif_get_first_item(ExifData *exif)
1126 {
1127         if (exif->items)
1128                 {
1129                 ExifItem *ret = (ExifItem *)exif->items->data;
1130                 exif->current = exif->items->next;
1131                 return ret;
1132                 }
1133         exif->current = NULL;
1134         return NULL;
1135 }
1136
1137 ExifItem *exif_get_next_item(ExifData *exif)
1138 {
1139         if (exif->current)
1140                 {
1141                 ExifItem *ret = (ExifItem *)exif->current->data;
1142                 exif->current = exif->current->next;
1143                 return ret;
1144                 }
1145         return NULL;
1146 }
1147
1148 static gint map_file(const gchar *path, void **mapping, gint *size)
1149 {
1150         gint fd;
1151         struct stat fs;
1152
1153         fd = open(path, O_RDONLY);
1154         if (fd == -1)
1155                 {
1156                 perror(path);
1157                 return -1;
1158                 }
1159
1160         if (fstat(fd, &fs) == -1)
1161                 {
1162                 perror(path);
1163                 close(fd);
1164                 return -1;
1165                 }
1166
1167         *size = fs.st_size;
1168
1169         *mapping = mmap(0, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
1170         if (*mapping == MAP_FAILED)
1171                 {
1172                 perror(path);
1173                 close(fd);
1174                 return -1;
1175                 }
1176
1177         close(fd);
1178         return 0;
1179 }
1180
1181 static gint unmap_file(gpointer mapping, gint size)
1182 {
1183         if (munmap(mapping, size) == -1)
1184                 {
1185                 perror("munmap");
1186                 return -1;
1187                 }
1188
1189         return 0;
1190 }
1191
1192 ExifData *exif_get_original(ExifData *processed)
1193 {
1194         return processed;
1195 }
1196
1197 void exif_free(ExifData *exif)
1198 {
1199         GList *work;
1200
1201         if (!exif) return;
1202
1203         work = exif->items;
1204         while (work)
1205                 {
1206                 ExifItem *item = work->data;
1207                 work = work->next;
1208                 exif_item_free(item);
1209                 }
1210
1211         g_list_free(exif->items);
1212         g_free(exif->path);
1213         g_free(exif);
1214 }
1215
1216 ExifData *exif_read(gchar *path, gchar *sidecar_path, GHashTable *modified_xmp)
1217 {
1218         ExifData *exif;
1219         gpointer f;
1220         gint size, res;
1221         gchar *pathl;
1222
1223         if (!path) return NULL;
1224
1225         pathl = path_from_utf8(path);
1226         if (map_file(pathl, &f, &size) == -1)
1227                 {
1228                 g_free(pathl);
1229                 return NULL;
1230                 }
1231         g_free(pathl);
1232
1233         exif = g_new0(ExifData, 1);
1234         exif->path = g_strdup(path);
1235
1236         res = exif_jpeg_parse(exif, (guchar *)f, size, ExifKnownMarkersList);
1237         if (res == -2)
1238                 {
1239                 res = exif_tiff_parse(exif, (guchar *)f, size, ExifKnownMarkersList);
1240                 }
1241
1242         if (res != 0)
1243                 {
1244                 FormatRawExifType exif_type;
1245                 FormatRawExifParseFunc exif_parse_func;
1246                 guint32 offset = 0;
1247
1248                 exif_type = format_raw_exif_offset(f, size, &offset, &exif_parse_func);
1249                 switch (exif_type)
1250                         {
1251                         case FORMAT_RAW_EXIF_NONE:
1252                         default:
1253                                 break;
1254                         case FORMAT_RAW_EXIF_TIFF:
1255                                 res = exif_tiff_parse(exif, (guchar *)f + offset, size - offset,
1256                                                       ExifKnownMarkersList);
1257                                 break;
1258                         case FORMAT_RAW_EXIF_JPEG:
1259                                 res = exif_jpeg_parse(exif, (guchar *)f + offset, size - offset,
1260                                                       ExifKnownMarkersList);
1261                                 break;
1262                         case FORMAT_RAW_EXIF_IFD_II:
1263                         case FORMAT_RAW_EXIF_IFD_MM:
1264                                 res = exif_parse_IFD_table(exif, (guchar *)f, offset, size - offset,
1265                                                            (exif_type == FORMAT_RAW_EXIF_IFD_II) ?
1266                                                                 EXIF_BYTE_ORDER_INTEL : EXIF_BYTE_ORDER_MOTOROLA,
1267                                                            0, ExifKnownMarkersList);
1268                                 break;
1269                         case FORMAT_RAW_EXIF_PROPRIETARY:
1270                                 if (exif_parse_func)
1271                                         {
1272                                         res = exif_parse_func((guchar *)f + offset, size - offset, exif);
1273                                         }
1274                                 break;
1275                         }
1276                 }
1277
1278         if (res != 0)
1279                 {
1280                 exif_free(exif);
1281                 exif = NULL;
1282                 }
1283
1284         unmap_file(f, size);
1285
1286         if (exif) exif->items = g_list_reverse(exif->items);
1287
1288         return exif;
1289 }
1290
1291 ExifItem *exif_get_item(ExifData *exif, const gchar *key)
1292 {
1293         GList *work;
1294
1295         if (!key) return NULL;
1296
1297         work = exif->items;
1298         while (work)
1299                 {
1300                 ExifItem *item;
1301
1302                 item = work->data;
1303                 work = work->next;
1304                 if (item->marker->key && strcmp(key, item->marker->key) == 0) return item;
1305                 }
1306         return NULL;
1307 }
1308
1309 #define EXIF_DATA_AS_TEXT_MAX_COUNT 16
1310
1311
1312 static gchar *exif_item_get_data_as_text_full(ExifItem *item, MetadataFormat format)
1313 {
1314         const ExifMarker *marker;
1315         gpointer data;
1316         GString *string;
1317         gchar *text;
1318         gint ne;
1319         gint i;
1320
1321         if (!item) return NULL;
1322
1323         marker = item->marker;
1324         if (!marker) return NULL;
1325
1326         data = item->data;
1327         ne = item->elements;
1328         if (ne > EXIF_DATA_AS_TEXT_MAX_COUNT) ne = EXIF_DATA_AS_TEXT_MAX_COUNT;
1329         string = g_string_new("");
1330         switch (item->format)
1331                 {
1332                 case EXIF_FORMAT_UNKNOWN:
1333                         break;
1334                 case EXIF_FORMAT_BYTE_UNSIGNED:
1335                 case EXIF_FORMAT_BYTE:
1336                 case EXIF_FORMAT_UNDEFINED:
1337                         if (ne == 1 && marker->list && format == METADATA_FORMATTED)
1338                                 {
1339                                 gchar *result;
1340                                 guchar val;
1341
1342                                 if (item->format == EXIF_FORMAT_BYTE_UNSIGNED ||
1343                                     item->format == EXIF_FORMAT_UNDEFINED)
1344                                         {
1345                                         val = ((guchar *)data)[0];
1346                                         }
1347                                 else
1348                                         {
1349                                         val = (guchar)(((gchar *)data)[0]);
1350                                         }
1351
1352                                 result = exif_text_list_find_value(marker->list, (guint)val);
1353                                 string = g_string_append(string, result);
1354                                 g_free(result);
1355                                 }
1356                         else
1357                                 {
1358                                 string = string_append_raw_bytes(string, data, ne);
1359                                 }
1360                         break;
1361                 case EXIF_FORMAT_STRING:
1362                         if (item->data) string = g_string_append(string, (gchar *)(item->data));
1363                         break;
1364                 case EXIF_FORMAT_SHORT_UNSIGNED:
1365                         if (ne == 1 && marker->list && format == METADATA_FORMATTED)
1366                                 {
1367                                 gchar *result;
1368
1369                                 result = exif_text_list_find_value(marker->list, ((guint16 *)data)[0]);
1370                                 string = g_string_append(string, result);
1371                                 g_free(result);
1372                                 }
1373                         else for (i = 0; i < ne; i++)
1374                                 {
1375                                 g_string_append_printf(string, "%s%hd", (i > 0) ? ", " : "",
1376                                                         ((guint16 *)data)[i]);
1377                                 }
1378                         break;
1379                 case EXIF_FORMAT_LONG_UNSIGNED:
1380                         for (i = 0; i < ne; i++)
1381                                 {
1382                                 g_string_append_printf(string, "%s%ld", (i > 0) ? ", " : "",
1383                                                         (gulong)((guint32 *)data)[i]);
1384                                 }
1385                         break;
1386                 case EXIF_FORMAT_RATIONAL_UNSIGNED:
1387                         for (i = 0; i < ne; i++)
1388                                 {
1389                                 ExifRational *r;
1390
1391                                 r = &((ExifRational *)data)[i];
1392                                 g_string_append_printf(string, "%s%ld/%ld", (i > 0) ? ", " : "",
1393                                                         (gulong)r->num, (gulong)r->den);
1394                                 }
1395                         break;
1396                 case EXIF_FORMAT_SHORT:
1397                         for (i = 0; i < ne; i++)
1398                                 {
1399                                 g_string_append_printf(string, "%s%hd", (i > 0) ? ", " : "",
1400                                                         ((gint16 *)data)[i]);
1401                                 }
1402                         break;
1403                 case EXIF_FORMAT_LONG:
1404                         for (i = 0; i < ne; i++)
1405                                 {
1406                                 g_string_append_printf(string, "%s%ld", (i > 0) ? ", " : "",
1407                                                         (glong)((gint32 *)data)[i]);
1408                                 }
1409                         break;
1410                 case EXIF_FORMAT_RATIONAL:
1411                         for (i = 0; i < ne; i++)
1412                                 {
1413                                 ExifRational *r;
1414
1415                                 r = &((ExifRational *)data)[i];
1416                                 g_string_append_printf(string, "%s%ld/%ld", (i > 0) ? ", " : "",
1417                                                         (glong)r->num, (glong)r->den);
1418                                 }
1419                         break;
1420                 case EXIF_FORMAT_FLOAT:
1421                         for (i = 0; i < ne; i++)
1422                                 {
1423                                 g_string_append_printf(string, "%s%f", (i > 0) ? ", " : "",
1424                                                         ((float *)data)[i]);
1425                                 }
1426                         break;
1427                 case EXIF_FORMAT_DOUBLE:
1428                         for (i = 0; i < ne; i++)
1429                                 {
1430                                 g_string_append_printf(string, "%s%f", (i > 0) ? ", " : "",
1431                                                         ((gdouble *)data)[i]);
1432                                 }
1433                         break;
1434                 }
1435
1436         if (item->elements > EXIF_DATA_AS_TEXT_MAX_COUNT &&
1437             item->format != EXIF_FORMAT_STRING)
1438                 {
1439                 g_string_append(string, " ...");
1440                 }
1441
1442         text = string->str;
1443         g_string_free(string, FALSE);
1444
1445         return text;
1446 }
1447
1448 gchar *exif_item_get_string(ExifItem *item, gint idx)
1449 {
1450         return exif_item_get_data_as_text_full(item, METADATA_PLAIN);
1451 }
1452
1453 gchar *exif_item_get_data_as_text(ExifItem *item)
1454 {
1455         return exif_item_get_data_as_text_full(item, METADATA_FORMATTED);
1456 }
1457
1458 gint exif_item_get_integer(ExifItem *item, gint *value)
1459 {
1460         if (!item) return FALSE;
1461         if (!item->elements) return FALSE;
1462
1463         switch (item->format)
1464                 {
1465                 case EXIF_FORMAT_SHORT:
1466                         *value = (gint)(((gint16 *)(item->data))[0]);
1467                         return TRUE;
1468                         break;
1469                 case EXIF_FORMAT_SHORT_UNSIGNED:
1470                         *value = (gint)(((guint16 *)(item->data))[0]);
1471                         return TRUE;
1472                         break;
1473                 case EXIF_FORMAT_LONG:
1474                         *value = (gint)(((gint32 *)(item->data))[0]);
1475                         return TRUE;
1476                         break;
1477                 case EXIF_FORMAT_LONG_UNSIGNED: /**< @FIXME overflow possible */
1478                         *value = (gint)(((guint32 *)(item->data))[0]);
1479                         return TRUE;
1480                 default:
1481                         /* all other type return FALSE */
1482                         break;
1483                 }
1484         return FALSE;
1485 }
1486
1487
1488 ExifRational *exif_item_get_rational(ExifItem *item, gint *sign, guint n)
1489 {
1490         if (!item) return NULL;
1491         if (n >= item->elements) return NULL;
1492
1493         if (item->format == EXIF_FORMAT_RATIONAL ||
1494             item->format == EXIF_FORMAT_RATIONAL_UNSIGNED)
1495                 {
1496                 if (sign) *sign = (item->format == EXIF_FORMAT_RATIONAL);
1497                 return &((ExifRational *)(item->data))[n];
1498                 }
1499
1500         return NULL;
1501 }
1502
1503 gchar *exif_get_tag_description_by_key(const gchar *key)
1504 {
1505         gint i;
1506
1507         if (!key) return NULL;
1508
1509         i = 0;
1510         while (ExifKnownMarkersList[i].tag > 0)
1511                 {
1512                 if (strcmp(key, ExifKnownMarkersList[i].key) == 0) return g_strdup(_(ExifKnownMarkersList[i].description));
1513                 i++;
1514                 }
1515
1516         i = 0;
1517         while (ExifKnownGPSInfoMarkersList[i].tag > 0)
1518         {
1519            if (strcmp(key, ExifKnownGPSInfoMarkersList[i].key) == 0) return g_strdup(_(ExifKnownGPSInfoMarkersList[i].description));
1520            i++;
1521         }
1522
1523         return NULL;
1524 }
1525
1526 static void exif_write_item(FILE *f, ExifItem *item)
1527 {
1528         gchar *text;
1529
1530         text = exif_item_get_data_as_text(item);
1531         if (text)
1532                 {
1533                 gchar *tag = exif_item_get_tag_name(item);
1534                 g_fprintf(f, "%4x %9s %30s %s\n", item->tag, ExifFormatList[item->format].short_name,
1535                         tag, text);
1536                 g_free(tag);
1537                 }
1538         g_free(text);
1539 }
1540
1541 void exif_write_data_list(ExifData *exif, FILE *f, gint human_readable_list)
1542 {
1543         if (!f || !exif) return;
1544
1545         g_fprintf(f, " tag   format                             key value\n");
1546         g_fprintf(f, "----------------------------------------------------\n");
1547
1548         if (human_readable_list)
1549                 {
1550                 gint i;
1551
1552                 i = 0;
1553                 while (ExifFormattedList[i].key)
1554                         {
1555                         gchar *text;
1556
1557                         text = exif_get_formatted_by_key(exif, ExifFormattedList[i].key, NULL);
1558                         if (text)
1559                                 {
1560                                 g_fprintf(f, "     %9s %30s %s\n", "string", ExifFormattedList[i].key, text);
1561                                 }
1562                         i++;
1563                         }
1564                 }
1565         else
1566                 {
1567                 GList *work;
1568
1569                 work = exif->items;
1570                 while (work)
1571                         {
1572                         ExifItem *item;
1573
1574                         item = work->data;
1575                         work = work->next;
1576
1577                         exif_write_item(f, item);
1578                         }
1579                 }
1580         g_fprintf(f, "----------------------------------------------------\n");
1581 }
1582
1583 gboolean exif_write(ExifData *exif)
1584 {
1585         log_printf("Not compiled with EXIF write support\n");
1586         return FALSE;
1587 }
1588
1589 gboolean exif_write_sidecar(ExifData *exif, gchar *path)
1590 {
1591         log_printf("Not compiled with EXIF write support\n");
1592         return FALSE;
1593 }
1594
1595
1596 gint exif_update_metadata(ExifData *exif, const gchar *key, const GList *values)
1597 {
1598         return 0;
1599 }
1600
1601 GList *exif_get_metadata(ExifData *exif, const gchar *key, MetadataFormat format)
1602 {
1603         gchar *str;
1604         ExifItem *item;
1605
1606         if (!key) return NULL;
1607
1608         /* convert xmp key to exif key */
1609         if (strcmp(key, "Xmp.tiff.Orientation") == 0) key = "Exif.Image.Orientation";
1610
1611         if (format == METADATA_FORMATTED)
1612                 {
1613                 gchar *text;
1614                 gint key_valid;
1615                 text = exif_get_formatted_by_key(exif, key, &key_valid);
1616                 if (key_valid) return g_list_append(NULL, text);
1617                 }
1618
1619         item = exif_get_item(exif, key);
1620         if (!item) return NULL;
1621
1622         str = exif_item_get_data_as_text_full(item, format);
1623
1624         if (!str) return NULL;
1625
1626         return g_list_append(NULL, str);
1627 }
1628
1629 typedef struct _UnmapData UnmapData;
1630 struct _UnmapData
1631 {
1632         guchar *ptr;
1633         guchar *map_data;
1634         size_t map_len;
1635 };
1636
1637 static GList *exif_unmap_list = 0;
1638
1639 guchar *exif_get_preview(ExifData *exif, guint *data_len, gint requested_width, gint requested_height)
1640 {
1641         guint offset;
1642         const gchar* path;
1643         struct stat st;
1644         guchar *map_data;
1645         size_t map_len;
1646         int fd;
1647
1648         if (!exif) return NULL;
1649         path = exif->path;
1650
1651         fd = open(path, O_RDONLY);
1652
1653
1654         if (fd == -1)
1655                 {
1656                 return 0;
1657                 }
1658
1659         if (fstat(fd, &st) == -1)
1660                 {
1661                 close(fd);
1662                 return 0;
1663                 }
1664         map_len = st.st_size;
1665         map_data = (guchar *) mmap(0, map_len, PROT_READ, MAP_PRIVATE, fd, 0);
1666         close(fd);
1667
1668         if (map_data == MAP_FAILED)
1669                 {
1670                 return 0;
1671                 }
1672
1673         if (format_raw_img_exif_offsets(map_data, map_len, &offset, NULL) && offset)
1674                 {
1675                 UnmapData *ud;
1676
1677                 DEBUG_1("%s: offset %u", path, offset);
1678
1679                 *data_len = map_len - offset;
1680                 ud = g_new(UnmapData, 1);
1681                 ud->ptr = map_data + offset;
1682                 ud->map_data = map_data;
1683                 ud->map_len = map_len;
1684
1685                 exif_unmap_list = g_list_prepend(exif_unmap_list, ud);
1686                 return ud->ptr;
1687                 }
1688
1689         munmap(map_data, map_len);
1690         return NULL;
1691
1692 }
1693
1694 void exif_free_preview(guchar *buf)
1695 {
1696         GList *work = exif_unmap_list;
1697
1698         while (work)
1699                 {
1700                 UnmapData *ud = (UnmapData *)work->data;
1701                 if (ud->ptr == buf)
1702                         {
1703                         exif_unmap_list = g_list_remove_link(exif_unmap_list, work);
1704                         g_free(ud);
1705                         return;
1706                         }
1707                 work = work->next;
1708                 }
1709         g_assert_not_reached();
1710 }
1711
1712 void exif_init(void)
1713 {
1714 }
1715
1716 #endif
1717 /* not HAVE_EXIV2 */
1718 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */