src/exif.cc

   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 <cmath>
  53 #include <cstdio>
  54 #include <cstring>
  55 #include <fcntl.h>
  56 #include <sys/mman.h>
  57 #include <sys/stat.h>
  58 #include <sys/types.h>
  59 #include <unistd.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         { static_cast<ExifFormatType>(-1), 0, nullptr, nullptr }
  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"), nullptr },
 323 { 0x0101, EXIF_FORMAT_LONG_UNSIGNED, 1,         "Exif.Image.ImageLength",       N_("Image Height"), nullptr },
 324 { 0x0102, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Image.BitsPerSample",     N_("Bits per Sample/Pixel"), nullptr },
 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"), nullptr },
 327 { 0x010f, EXIF_FORMAT_STRING, -1,               "Exif.Image.Make",              N_("Camera make"), nullptr },
 328 { 0x0110, EXIF_FORMAT_STRING, -1,               "Exif.Image.Model",             N_("Camera model"), nullptr },
 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"), nullptr },
 331 { 0x011b, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Image.YResolution",       N_("Y Resolution"), nullptr },
 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"), nullptr },
 334 { 0x0132, EXIF_FORMAT_STRING, 20,               "Exif.Image.DateTime",          N_("Date"), nullptr },
 335 { 0x013e, EXIF_FORMAT_RATIONAL_UNSIGNED, 2,     "Exif.Image.WhitePoint",        N_("White point"), nullptr },
 336 { 0x013f, EXIF_FORMAT_RATIONAL_UNSIGNED, 6,     "Exif.Image.PrimaryChromaticities",N_("Primary chromaticities"), nullptr },
 337 { 0x0211, EXIF_FORMAT_RATIONAL_UNSIGNED, 3,     "Exif.Image.YCbCrCoefficients", N_("YCbCy coefficients"), nullptr },
 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"), nullptr },
 340 { 0x8298, EXIF_FORMAT_STRING, -1,               "Exif.Image.Copyright",         N_("Copyright"), nullptr },
 341 { 0x8769, EXIF_FORMAT_LONG_UNSIGNED, 1,         "Exif.Image.ExifTag",           N_("SubIFD Exif offset"), nullptr },
 342         /* subIFD follows */
 343 { 0x829a, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.ExposureTime",      N_("Exposure time (seconds)"), nullptr },
 344 { 0x829d, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.FNumber",           N_("FNumber"), nullptr },
 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"), nullptr },
 347 { 0x8827, EXIF_FORMAT_SHORT_UNSIGNED, -1,       "Exif.Photo.ISOSpeedRatings",   N_("ISO sensitivity"), nullptr },
 348 { 0x8828, EXIF_FORMAT_UNDEFINED, -1,            "Exif.Photo.OECF",              N_("Optoelectric conversion factor"), nullptr },
 349 { 0x9000, EXIF_FORMAT_UNDEFINED, 4,             "Exif.Photo.ExifVersion",       N_("Exif version"), nullptr },
 350 { 0x9003, EXIF_FORMAT_STRING, 20,               "Exif.Photo.DateTimeOriginal",  N_("Date original"), nullptr },
 351 { 0x9004, EXIF_FORMAT_STRING, 20,               "Exif.Photo.DateTimeDigitized", N_("Date digitized"), nullptr },
 352 { 0x9101, EXIF_FORMAT_UNDEFINED, -1,            "Exif.Photo.ComponentsConfiguration",N_("Pixel format"), nullptr },
 353 { 0x9102, EXIF_FORMAT_RATIONAL_UNSIGNED,1,      "Exif.Photo.CompressedBitsPerPixel",N_("Compression ratio"), nullptr },
 354 { 0x9201, EXIF_FORMAT_RATIONAL, 1,              "Exif.Photo.ShutterSpeedValue", N_("Shutter speed"), nullptr },
 355 { 0x9202, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.ApertureValue",     N_("Aperture"), nullptr },
 356 { 0x9203, EXIF_FORMAT_RATIONAL, 1,              "Exif.Photo.BrightnessValue",   N_("Brightness"), nullptr },
 357 { 0x9204, EXIF_FORMAT_RATIONAL, 1,              "Exif.Photo.ExposureBiasValue", N_("Exposure bias"), nullptr },
 358 { 0x9205, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.MaxApertureValue",  N_("Maximum aperture"), nullptr },
 359 { 0x9206, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.SubjectDistance",   N_("Subject distance"), nullptr },
 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"), nullptr },
 364 { 0x9214, EXIF_FORMAT_SHORT_UNSIGNED, -1,       "Exif.Photo.SubjectArea",       N_("Subject area"), nullptr },
 365 { 0x927c, EXIF_FORMAT_UNDEFINED, -1,            "Exif.Photo.MakerNote",         N_("MakerNote"), nullptr },
 366 { 0x9286, EXIF_FORMAT_UNDEFINED, -1,            "Exif.Photo.UserComment",       N_("UserComment"), nullptr },
 367 { 0x9290, EXIF_FORMAT_STRING, -1,               "Exif.Photo.SubSecTime",        N_("Subsecond time"), nullptr },
 368 { 0x9291, EXIF_FORMAT_STRING, -1,               "Exif.Photo.SubSecTimeOriginal",N_("Subsecond time original"), nullptr },
 369 { 0x9292, EXIF_FORMAT_STRING, -1,               "Exif.Photo.SubSecTimeDigitized",N_("Subsecond time digitized"), nullptr },
 370 { 0xa000, EXIF_FORMAT_UNDEFINED, 4,             "Exif.Photo.FlashpixVersion",   N_("FlashPix version"), nullptr },
 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"), nullptr },
 374 { 0xa003, EXIF_FORMAT_LONG_UNSIGNED, 1,         "Exif.Photo.PixelYDimension",   N_("Height"), nullptr },
 375 { 0xa004, EXIF_FORMAT_STRING, -1,               "Exif.Photo.RelatedSoundFile",  N_("Audio data"), nullptr },
 376 { 0xa005, EXIF_FORMAT_LONG_UNSIGNED, 1,         "ExifInteroperabilityOffset",   N_("ExifR98 extension"), nullptr },
 377 { 0xa20b, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.FlashEnergy",       N_("Flash strength"), nullptr },
 378 { 0xa20c, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Photo.SpatialFrequencyResponse",N_("Spatial frequency response"), nullptr },
 379 { 0xa20e, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.FocalPlaneXResolution", N_("X Pixel density"), nullptr },
 380 { 0xa20f, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.FocalPlaneYResolution", N_("Y Pixel density"), nullptr },
 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"), nullptr },
 383 { 0xa215, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.ExposureIndex",     N_("ISO sensitivity"), nullptr },
 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"), nullptr },
 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"), nullptr },
 393 { 0xa405, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Exif.Photo.FocalLengthIn35mmFilm",N_("Focal length (35mm)"), nullptr },
 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"), nullptr },
 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"), nullptr },
 402         /* place known, but undocumented or lesser used tags here */
 403 { 0x00fe, EXIF_FORMAT_LONG_UNSIGNED, 1,         "Exif.Image.NewSubfileType",    nullptr, nullptr },
 404 { 0x00ff, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "SubfileType",                  nullptr, nullptr },
 405 { 0x012d, EXIF_FORMAT_SHORT_UNSIGNED, 3,        "Exif.Image.TransferFunction",  nullptr, nullptr },
 406 { 0x013b, EXIF_FORMAT_STRING, -1,               "Exif.Image.Artist",            "Artist", nullptr },
 407 { 0x013d, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Predictor",            nullptr, nullptr },
 408 { 0x0142, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "TileWidth",            nullptr, nullptr },
 409 { 0x0143, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "TileLength",           nullptr, nullptr },
 410 { 0x0144, EXIF_FORMAT_LONG_UNSIGNED, -1,        "TileOffsets",          nullptr, nullptr },
 411 { 0x0145, EXIF_FORMAT_SHORT_UNSIGNED, -1,       "TileByteCounts",       nullptr, nullptr },
 412 { 0x014a, EXIF_FORMAT_LONG_UNSIGNED, -1,        "Exif.Image.SubIFDs",           nullptr, nullptr },
 413 { 0x015b, EXIF_FORMAT_UNDEFINED, -1,            "JPEGTables",           nullptr, nullptr },
 414 { 0x828d, EXIF_FORMAT_SHORT_UNSIGNED, 2,        "Exif.Image.CFARepeatPatternDim",       nullptr, nullptr },
 415 { 0x828e, EXIF_FORMAT_BYTE_UNSIGNED, -1,        "Exif.Image.CFAPattern",                nullptr, nullptr },
 416 { 0x828f, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Image.BatteryLevel",              nullptr, nullptr },
 417 { 0x83bb, EXIF_FORMAT_LONG_UNSIGNED, -1,        "IPTC/NAA",             nullptr, nullptr },
 418 { 0x8773, EXIF_FORMAT_UNDEFINED, -1,            "Exif.Image.InterColorProfile",         nullptr, nullptr },
 419 { 0x8825, EXIF_FORMAT_LONG_UNSIGNED, 1,         "GPSInfo",              "SubIFD GPS offset", nullptr },
 420 { 0x8829, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Interlace",            nullptr, nullptr },
 421 { 0x882a, EXIF_FORMAT_SHORT, 1,                 "TimeZoneOffset",       nullptr, nullptr },
 422 { 0x882b, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "SelfTimerMode",        nullptr, nullptr },
 423 { 0x920b, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.FlashEnergy",               nullptr, nullptr },
 424 { 0x920c, EXIF_FORMAT_UNDEFINED, -1,            "Exif.Photo.SpatialFrequencyResponse", nullptr, nullptr },
 425 { 0x920d, EXIF_FORMAT_UNDEFINED, -1,            "Noise",                nullptr, nullptr },
 426 { 0x9211, EXIF_FORMAT_LONG_UNSIGNED, 1,         "ImageNumber",          nullptr, nullptr },
 427 { 0x9212, EXIF_FORMAT_STRING, 1,                "SecurityClassification", nullptr, nullptr },
 428 { 0x9213, EXIF_FORMAT_STRING, -1,               "ImageHistory",         nullptr, nullptr },
 429 { 0x9215, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "Exif.Photo.ExposureIndex",     nullptr, nullptr },
 430 { 0x9216, EXIF_FORMAT_BYTE_UNSIGNED, 4,         "TIFF/EPStandardID",    nullptr, nullptr },
 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", nullptr, nullptr },
 440         { 0x0002, EXIF_FORMAT_RATIONAL_UNSIGNED, 3, "Exif.GPSInfo.GPSLatitude", nullptr, nullptr },
 441         { 0x0003, EXIF_FORMAT_STRING, 2, "Exif.GPSInfo.GPSLongitudeRef", nullptr, nullptr },
 442         { 0x0004, EXIF_FORMAT_RATIONAL_UNSIGNED, 3, "Exif.GPSInfo.GPSLongitude", nullptr, nullptr },
 443         { 0x0005, EXIF_FORMAT_BYTE_UNSIGNED, 1, "Exif.GPSInfo.GPSAltitudeRef", nullptr, nullptr },
 444         { 0x0006, EXIF_FORMAT_RATIONAL_UNSIGNED, 1, "Exif.GPSInfo.GPSAltitude", nullptr, nullptr },
 445         { 0x0007, EXIF_FORMAT_RATIONAL_UNSIGNED, 3, "Exif.GPSInfo.GPSTimeStamp", nullptr, nullptr },
 446         { 0x0008, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSSatellites", nullptr, nullptr },
 447         { 0x0009, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSStatus", nullptr, nullptr },
 448         { 0x000a, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSMeasureMode", nullptr, nullptr },
 449         { 0x000b, EXIF_FORMAT_RATIONAL_UNSIGNED, -1, "Exif.GPSInfo.GPSDOP", nullptr, nullptr },
 450         { 0x000c, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSSpeedRef", nullptr, nullptr },
 451         { 0x000d, EXIF_FORMAT_RATIONAL_UNSIGNED, -1, "Exif.GPSInfo.GPSSpeed", nullptr, nullptr },
 452         { 0x000e, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSTrackRef", nullptr, nullptr },
 453         { 0x000f, EXIF_FORMAT_RATIONAL_UNSIGNED, -1, "Exif.GPSInfo.GPSTrack", nullptr, nullptr },
 454         { 0x0010, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSImgDirectionRef", nullptr, nullptr },
 455         { 0x0011, EXIF_FORMAT_RATIONAL_UNSIGNED, -1, "Exif.GPSInfo.GPSImgDirection", nullptr, nullptr },
 456         { 0x0012, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSMapDatum", nullptr, nullptr },
 457         { 0x0013, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSDestLatitudeRef", nullptr, nullptr },
 458         { 0x0014, EXIF_FORMAT_RATIONAL_UNSIGNED, -1, "Exif.GPSInfo.GPSDestLatitude", nullptr, nullptr },
 459         { 0x0015, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSDestLongitudeRef", nullptr, nullptr },
 460         { 0x0016, EXIF_FORMAT_RATIONAL_UNSIGNED, -1, "Exif.GPSInfo.GPSDestLongitude", nullptr, nullptr },
 461         { 0x0017, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSDestBearingRef", nullptr, nullptr },
 462         { 0x0018, EXIF_FORMAT_RATIONAL_UNSIGNED, -1, "Exif.GPSInfo.GPSDestBearing", nullptr, nullptr },
 463         { 0x0019, EXIF_FORMAT_STRING, -1, "Exif.GPSInfo.GPSDestDistanceRef", nullptr, nullptr },
 464         { 0x001a, EXIF_FORMAT_RATIONAL_UNSIGNED, -1, "Exif.GPSInfo.GPSDestDistance", nullptr, nullptr },
 465         { 0x001b, EXIF_FORMAT_UNDEFINED, -1, "Exif.GPSInfo.GPSProcessingMethod", nullptr, nullptr },
 466         { 0x001c, EXIF_FORMAT_UNDEFINED, -1, "Exif.GPSInfo.GPSAreaInformation", nullptr, nullptr },
 467         { 0x001d, EXIF_FORMAT_RATIONAL_UNSIGNED, 3, "Exif.GPSInfo.GPSDateStamp", nullptr, nullptr },
 468         { 0x001e, EXIF_FORMAT_SHORT, -1, "Exif.GPSInfo.GPSDifferential", nullptr, nullptr },
 469
 470         EXIF_MARKER_LIST_END
 471 };
 472
 473 ExifMarker ExifUnknownMarkersList[] = {
 474 { 0x0000, EXIF_FORMAT_UNKNOWN, 0,               "unknown",      nullptr, nullptr },
 475 { 0x0000, EXIF_FORMAT_BYTE_UNSIGNED, -1,        "unknown",      nullptr, nullptr },
 476 { 0x0000, EXIF_FORMAT_STRING, -1,               "unknown",      nullptr, nullptr },
 477 { 0x0000, EXIF_FORMAT_SHORT_UNSIGNED, -1,       "unknown",      nullptr, nullptr },
 478 { 0x0000, EXIF_FORMAT_LONG_UNSIGNED, -1,        "unknown",      nullptr, nullptr },
 479 { 0x0000, EXIF_FORMAT_RATIONAL_UNSIGNED, -1,    "unknown",      nullptr, nullptr },
 480 { 0x0000, EXIF_FORMAT_BYTE, -1,                 "unknown",      nullptr, nullptr },
 481 { 0x0000, EXIF_FORMAT_UNDEFINED, -1,            "unknown",      nullptr, nullptr },
 482 { 0x0000, EXIF_FORMAT_SHORT, -1,                "unknown",      nullptr, nullptr },
 483 { 0x0000, EXIF_FORMAT_LONG, -1,                 "unknown",      nullptr, nullptr },
 484 { 0x0000, EXIF_FORMAT_RATIONAL, -1,             "unknown",      nullptr, nullptr },
 485 { 0x0000, EXIF_FORMAT_FLOAT, -1,                "unknown",      nullptr, nullptr },
 486 { 0x0000, EXIF_FORMAT_DOUBLE, -1,               "unknown",      nullptr, nullptr },
 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 nullptr;
 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 #if GLIB_CHECK_VERSION(2,68,0)
 588         return static_cast<gchar*>(g_memdup2(item->data, item->data_len));
 589 #else
 590         return static_cast<gchar*>(g_memdup(item->data, item->data_len));
 591 #endif
 592 }
 593
 594 guint exif_item_get_format_id(ExifItem *item)
 595 {
 596         if (!item) return EXIF_FORMAT_UNKNOWN;
 597         return item->format;
 598 }
 599
 600
 601 gchar *exif_item_get_description(ExifItem *item)
 602 {
 603         if (!item || !item->marker) return nullptr;
 604         return g_strdup(_(item->marker->description));
 605 }
 606
 607 const gchar *exif_item_get_format_name(ExifItem *item, gboolean brief)
 608 {
 609         if (!item || !item->marker) return nullptr;
 610         return (brief) ? ExifFormatList[item->format].short_name : ExifFormatList[item->format].description;
 611 }
 612
 613 static GString *string_append_raw_bytes(GString *string, gpointer data, gint ne)
 614 {
 615         gint i;
 616
 617         for (i = 0 ; i < ne; i++)
 618                 {
 619                 guchar c = (static_cast<gchar *>(data))[i];
 620                 if (c < 32 || c > 127) c = '.';
 621                 g_string_append_printf(string, "%c", c);
 622                 }
 623         string = g_string_append(string, " : ");
 624         for (i = 0 ; i < ne; i++)
 625                 {
 626                 const gchar *spacer;
 627                 if (i > 0)
 628                         {
 629                         if (i%8 == 0)
 630                                 {
 631                                 spacer = " - ";
 632                                 }
 633                         else
 634                                 {
 635                                 spacer = " ";
 636                                 }
 637                         }
 638                 else
 639                         {
 640                         spacer = "";
 641                         }
 642                 g_string_append_printf(string, "%s%02x", spacer, (static_cast<gchar *>(data))[i]);
 643                 }
 644
 645         return string;
 646 }
 647
 648
 649 gchar *exif_text_list_find_value(ExifTextList *list, guint value)
 650 {
 651         gchar *result = nullptr;
 652         gint i;
 653
 654         i = 0;
 655         while (!result && list[i].value >= 0)
 656                 {
 657                 if (value == static_cast<guint>(list[i].value)) result = g_strdup(_(list[i].description));
 658                 i++;
 659                 }
 660         if (!result) result = g_strdup_printf("%d (%s)", value, _("unknown"));
 661
 662         return result;
 663 }
 664
 665
 666 /*
 667  *-------------------------------------------------------------------
 668  * byte order utils
 669  *-------------------------------------------------------------------
 670  */
 671
 672 /* note: the align_buf is used to avoid alignment issues (on sparc) */
 673
 674 guint16 exif_byte_get_int16(guchar *f, ExifByteOrder bo)
 675 {
 676         guint16 align_buf;
 677
 678         memcpy(&align_buf, f, sizeof(guint16));
 679
 680         if (bo == EXIF_BYTE_ORDER_INTEL)
 681                 return GUINT16_FROM_LE(align_buf);
 682         else
 683                 return GUINT16_FROM_BE(align_buf);
 684 }
 685
 686 guint32 exif_byte_get_int32(guchar *f, ExifByteOrder bo)
 687 {
 688         guint32 align_buf;
 689
 690         memcpy(&align_buf, f, sizeof(guint32));
 691
 692         if (bo == EXIF_BYTE_ORDER_INTEL)
 693                 return GUINT32_FROM_LE(align_buf);
 694         else
 695                 return GUINT32_FROM_BE(align_buf);
 696 }
 697
 698 void exif_byte_put_int16(guchar *f, guint16 n, ExifByteOrder bo)
 699 {
 700         guint16 align_buf;
 701
 702         if (bo == EXIF_BYTE_ORDER_INTEL)
 703                 {
 704                 align_buf = GUINT16_TO_LE(n);
 705                 }
 706         else
 707                 {
 708                 align_buf = GUINT16_TO_BE(n);
 709                 }
 710
 711         memcpy(f, &align_buf, sizeof(guint16));
 712 }
 713
 714 void exif_byte_put_int32(guchar *f, guint32 n, ExifByteOrder bo)
 715 {
 716         guint32 align_buf;
 717
 718         if (bo == EXIF_BYTE_ORDER_INTEL)
 719                 {
 720                 align_buf = GUINT32_TO_LE(n);
 721                 }
 722         else
 723                 {
 724                 align_buf = GUINT32_TO_BE(n);
 725                 }
 726
 727         memcpy(f, &align_buf, sizeof(guint32));
 728 }
 729
 730
 731 /*
 732  *-------------------------------------------------------------------
 733  * IFD utils
 734  *-------------------------------------------------------------------
 735  */
 736
 737 static const ExifMarker *exif_marker_from_tag(guint16 tag, const ExifMarker *list)
 738 {
 739         gint i = 0;
 740
 741         if (!list) return nullptr;
 742
 743         while (list[i].tag != 0 && list[i].tag != tag)
 744                 {
 745                 i++;
 746                 }
 747
 748         return (list[i].tag == 0 ? nullptr : &list[i]);
 749 }
 750
 751 static void rational_from_data(ExifRational *r, gpointer src, ExifByteOrder bo)
 752 {
 753         r->num = exif_byte_get_int32(static_cast<guchar *>(src), bo);
 754         r->den = exif_byte_get_int32(static_cast<guchar *>(src) + sizeof(guint32), bo);
 755 }
 756
 757 /* src_format and item->format must be compatible
 758  * and not overrun src or item->data.
 759  */
 760 void exif_item_copy_data(ExifItem *item, gpointer src, guint len,
 761                          ExifFormatType src_format, ExifByteOrder bo)
 762 {
 763         gint bs;
 764         gint ne;
 765         gpointer dest;
 766         gint i;
 767
 768         bs = ExifFormatList[item->format].size;
 769         ne = item->elements;
 770         dest = item->data;
 771
 772         if (!dest ||
 773             ExifFormatList[src_format].size * ne > len)
 774                 {
 775                 gchar *tag = exif_item_get_tag_name(item);
 776                 log_printf("exif tag %s data size mismatch\n", tag);
 777                 g_free(tag);
 778                 return;
 779                 }
 780
 781         switch (item->format)
 782                 {
 783                 case EXIF_FORMAT_UNKNOWN:
 784                         break;
 785                 case EXIF_FORMAT_BYTE_UNSIGNED:
 786                 case EXIF_FORMAT_BYTE:
 787                 case EXIF_FORMAT_UNDEFINED:
 788                         memcpy(dest, src, len);
 789                         break;
 790                 case EXIF_FORMAT_STRING:
 791                         memcpy(dest, src, len);
 792                         /* string is NULL terminated, make sure this is true */
 793                         if ((static_cast<gchar *>(dest))[len - 1] != '\0') (static_cast<gchar *>(dest))[len - 1] = '\0';
 794                         break;
 795                 case EXIF_FORMAT_SHORT_UNSIGNED:
 796                 case EXIF_FORMAT_SHORT:
 797                         for (i = 0; i < ne; i++)
 798                                 {
 799                                 (static_cast<guint16 *>(dest))[i] = exif_byte_get_int16(static_cast<guchar *>(src) + i * bs, bo);
 800                                 }
 801                         break;
 802                 case EXIF_FORMAT_LONG_UNSIGNED:
 803                 case EXIF_FORMAT_LONG:
 804                         if (src_format == EXIF_FORMAT_SHORT_UNSIGNED ||
 805                             src_format == EXIF_FORMAT_SHORT)
 806                                 {
 807                                 /* a short fits into a long, so allow it */
 808                                 gint ss;
 809
 810                                 ss = ExifFormatList[src_format].size;
 811                                 for (i = 0; i < ne; i++)
 812                                         {
 813                                         (static_cast<gint32 *>(dest))[i] =
 814                                                 static_cast<gint32>(exif_byte_get_int16(static_cast<guchar *>(src) + i * ss, bo));
 815                                         }
 816                                 }
 817                         else
 818                                 {
 819                                 for (i = 0; i < ne; i++)
 820                                         {
 821                                         (static_cast<gint32 *>(dest))[i] =
 822                                                 exif_byte_get_int32(static_cast<guchar *>(src) + i * bs, bo);
 823                                         }
 824                                 }
 825                         break;
 826                 case EXIF_FORMAT_RATIONAL_UNSIGNED:
 827                 case EXIF_FORMAT_RATIONAL:
 828                         for (i = 0; i < ne; i++)
 829                                 {
 830                                 rational_from_data(&(static_cast<ExifRational *>(dest))[i], static_cast<guchar *>(src) + i * bs, bo);
 831                                 }
 832                         break;
 833                 case EXIF_FORMAT_FLOAT:
 834                         for (i = 0; i < ne; i++)
 835                                 {
 836                                 (static_cast<float *>(dest))[i] = exif_byte_get_int32(static_cast<guchar *>(src) + i * bs, bo);
 837                                 }
 838                         break;
 839                 case EXIF_FORMAT_DOUBLE:
 840                         for (i = 0; i < ne; i++)
 841                                 {
 842                                 ExifRational r;
 843
 844                                 rational_from_data(&r, static_cast<guchar *>(src) + i * bs, bo);
 845                                 if (r.den) (static_cast<gdouble *>(dest))[i] = static_cast<gdouble>(r.num) / r.den;
 846                                 }
 847                         break;
 848                 }
 849 }
 850
 851 static gint exif_parse_IFD_entry(ExifData *exif, guchar *tiff, guint offset,
 852                                  guint size, ExifByteOrder bo,
 853                                  gint level,
 854                                  const ExifMarker *list)
 855 {
 856         guint tag;
 857         guint format;
 858         guint count;
 859         guint data_val;
 860         guint data_offset;
 861         guint data_length;
 862         const ExifMarker *marker;
 863         ExifItem *item;
 864
 865         tag = exif_byte_get_int16(tiff + offset + EXIF_TIFD_OFFSET_TAG, bo);
 866         format = exif_byte_get_int16(tiff + offset + EXIF_TIFD_OFFSET_FORMAT, bo);
 867         count = exif_byte_get_int32(tiff + offset + EXIF_TIFD_OFFSET_COUNT, bo);
 868         data_val = exif_byte_get_int32(tiff + offset + EXIF_TIFD_OFFSET_DATA, bo);
 869
 870         /* Check tag type. If it does not match, either the format is wrong,
 871          * either it is a unknown tag; so it is not really an error.
 872          */
 873         marker = exif_marker_from_tag(tag, list);
 874         if (!marker)
 875                 {
 876                 if (format >= EXIF_FORMAT_COUNT)
 877                         {
 878                         log_printf("warning: exif tag 0x%4x has invalid format %d\n", tag, format);
 879                         return 0;
 880                         }
 881                 /* allow non recognized tags to be displayed */
 882                 marker = &ExifUnknownMarkersList[format];
 883                 }
 884         if (marker->format != format)
 885                 {
 886                 /* Some cameras got mixed up signed/unsigned_rational
 887                  * eg KODAK DC4800 on object_distance tag
 888                  *
 889                  * FIXME: what exactly is this test trying to do?
 890                  * ok, so this test is to allow the case of swapped signed/unsigned mismatch to leak through?
 891                  */
 892                 if ((marker->format != EXIF_FORMAT_RATIONAL_UNSIGNED || format != EXIF_FORMAT_RATIONAL) &&
 893                     (marker->format != EXIF_FORMAT_RATIONAL || format != EXIF_FORMAT_RATIONAL_UNSIGNED) &&
 894                         /* short fits into a long so allow this mismatch
 895                          * as well (some tags allowed to be unsigned short _or_ unsigned long)
 896                          */
 897                     (marker->format != EXIF_FORMAT_LONG_UNSIGNED || format != EXIF_FORMAT_SHORT_UNSIGNED) )
 898                         {
 899                         if (format < EXIF_FORMAT_COUNT)
 900                                 {
 901                                 log_printf("warning: exif tag %s format mismatch, found %s exif spec requests %s\n",
 902                                         marker->key, ExifFormatList[format].short_name,
 903                                         ExifFormatList[marker->format].short_name);
 904                                 }
 905                         else
 906                                 {
 907                                 log_printf("warning: exif tag %s format mismatch, found unknown id %d exif spec requests %d (%s)\n",
 908                                         marker->key, format, marker->format,
 909                                         ExifFormatList[marker->format].short_name);
 910                                 }
 911                         return 0;
 912                         }
 913                 }
 914
 915         /* Where is the data, is it available?
 916          */
 917         if (marker->components > 0 && static_cast<guint>(marker->components) != count)
 918                 {
 919                 log_printf("warning: exif tag %s has %d elements, exif spec requests %d\n",
 920                         marker->key, count, marker->components);
 921                 }
 922
 923         data_length = ExifFormatList[marker->format].size * count;
 924         if (data_length > 4)
 925                 {
 926                 data_offset = data_val;
 927                 if (size < data_offset || size < data_offset + data_length)
 928                         {
 929                         log_printf("warning: exif tag %s data will overrun end of file, ignored.\n", marker->key);
 930                         return -1;
 931                         }
 932                 }
 933         else
 934                 {
 935                 data_offset = offset + EXIF_TIFD_OFFSET_DATA;
 936                 }
 937
 938         item = exif_item_new(marker->format, tag, count, marker);
 939         exif_item_copy_data(item, tiff + data_offset, data_length, static_cast<ExifFormatType>(format), bo);
 940         exif->items = g_list_prepend(exif->items, item);
 941
 942         if (list == ExifKnownMarkersList)
 943                 {
 944                 switch (item->tag)
 945                         {
 946                         case TAG_EXIFOFFSET:
 947                                 exif_parse_IFD_table(exif, tiff, data_val, size, bo, level + 1, list);
 948                                 break;
 949                         case TAG_GPSOFFSET:
 950                                 exif_parse_IFD_table(exif, tiff, data_val, size, bo, level + 1, ExifKnownGPSInfoMarkersList);
 951                                 break;
 952                         case TAG_EXIFMAKERNOTE:
 953                                 format_exif_makernote_parse(exif, tiff, data_val, size, bo);
 954                                 break;
 955                         }
 956                 }
 957
 958         return 0;
 959 }
 960
 961 gint exif_parse_IFD_table(ExifData *exif,
 962                           guchar *tiff, guint offset,
 963                           guint size, ExifByteOrder bo,
 964                           gint level,
 965                           const ExifMarker *list)
 966 {
 967         guint count;
 968         guint i;
 969
 970         /* limit damage from infinite loops */
 971         if (level > EXIF_TIFF_MAX_LEVELS) return -1;
 972
 973         /* We should be able to read number of entries in IFD0) */
 974         if (size < offset + 2) return -1;
 975
 976         count = exif_byte_get_int16(tiff + offset, bo);
 977         offset += 2;
 978
 979         /* Entries and next IFD offset must be readable */
 980         if (size < offset + count * EXIF_TIFD_SIZE + 4) return -1;
 981
 982         for (i = 0; i < count; i++)
 983                 {
 984                 exif_parse_IFD_entry(exif, tiff, offset + i * EXIF_TIFD_SIZE, size, bo, level, list);
 985                 }
 986
 987         return 0;
 988 }
 989
 990 /*
 991  *-------------------------------------------------------------------
 992  * file formats
 993  *-------------------------------------------------------------------
 994  */
 995
 996 gint exif_tiff_directory_offset(guchar *data, const guint len,
 997                                 guint *offset, ExifByteOrder *bo)
 998 {
 999         if (len < 8) return FALSE;
1000
1001         if (memcmp(data, "II", 2) == 0)
1002                 {
1003                 *bo = EXIF_BYTE_ORDER_INTEL;
1004                 }
1005         else if (memcmp(data, "MM", 2) == 0)
1006                 {
1007                 *bo = EXIF_BYTE_ORDER_MOTOROLA;
1008                 }
1009         else
1010                 {
1011                 return FALSE;
1012                 }
1013
1014         if (exif_byte_get_int16(data + 2, *bo) != 0x002A)
1015                 {
1016                 return FALSE;
1017                 }
1018
1019         *offset = exif_byte_get_int32(data + 4, *bo);
1020
1021         return (*offset < len);
1022 }
1023
1024 gint exif_tiff_parse(ExifData *exif, guchar *tiff, guint size, ExifMarker *list)
1025 {
1026         ExifByteOrder bo;
1027         guint offset;
1028
1029         if (!exif_tiff_directory_offset(tiff, size, &offset, &bo)) return -1;
1030
1031         return exif_parse_IFD_table(exif, tiff, offset, size, bo, 0, list);
1032 }
1033
1034
1035 /*
1036  *-------------------------------------------------------------------
1037  * jpeg marker utils
1038  *-------------------------------------------------------------------
1039  */
1040
1041 /* jpeg container format:
1042      all data markers start with 0XFF
1043      2 byte long file start and end markers: 0xFFD8(SOI) and 0XFFD9(EOI)
1044      4 byte long data segment markers in format: 0xFFTTSSSSNNN...
1045        FF:   1 byte standard marker identifier
1046        TT:   1 byte data type
1047        SSSS: 2 bytes in Motorola byte alignment for length of the data.
1048              This value includes these 2 bytes in the count, making actual
1049              length of NN... == SSSS - 2.
1050        NNN.: the data in this segment
1051  */
1052 static ExifMarker jpeg_color_marker = { 0x8773, EXIF_FORMAT_UNDEFINED, -1, "Exif.Image.InterColorProfile", nullptr, nullptr };
1053
1054 void exif_add_jpeg_color_profile(ExifData *exif, guchar *cp_data, guint cp_length)
1055 {
1056         ExifItem *item = exif_item_new(jpeg_color_marker.format, jpeg_color_marker.tag, 1,
1057                                      &jpeg_color_marker);
1058         g_free(item->data);
1059         item->data = cp_data;
1060         item->elements = cp_length;
1061         item->data_len = cp_length;
1062         exif->items = g_list_prepend(exif->items, item);
1063
1064 }
1065
1066 static gint exif_jpeg_parse(ExifData *exif,
1067                             guchar *data, guint size,
1068                             ExifMarker *list)
1069 {
1070         guint seg_offset = 0;
1071         guint seg_length = 0;
1072         gint res = -1;
1073
1074         if (size < 4 ||
1075             memcmp(data, "\xFF\xD8", 2) != 0)
1076                 {
1077                 return -2;
1078                 }
1079
1080         if (jpeg_segment_find(data, size, JPEG_MARKER_APP1,
1081                                    "Exif\x00\x00", 6,
1082                                    &seg_offset, &seg_length))
1083                 {
1084                 res = exif_tiff_parse(exif, data + seg_offset + 6, seg_length - 6, list);
1085                 }
1086
1087         if (exif_jpeg_parse_color(exif, data, size))
1088                 {
1089                 res = 0;
1090                 }
1091
1092         return res;
1093 }
1094
1095 guchar *exif_get_color_profile(ExifData *exif, guint *data_len)
1096 {
1097         ExifItem *prof_item = exif_get_item(exif, "Exif.Image.InterColorProfile");
1098         if (prof_item && exif_item_get_format_id(prof_item) == EXIF_FORMAT_UNDEFINED)
1099                 return reinterpret_cast<guchar *>(exif_item_get_data(prof_item, data_len));
1100         return nullptr;
1101 }
1102
1103
1104 gchar* exif_get_image_comment(FileData*)
1105 {
1106         log_printf("%s", _("Can't get image comment: not compiled with Exiv2.\n"));
1107         return g_strdup("");
1108 }
1109
1110 void exif_set_image_comment(FileData*, const gchar*)
1111 {
1112         log_printf("%s", _("Can't set image comment: not compiled with Exiv2.\n"));
1113 }
1114
1115
1116 /*
1117  *-------------------------------------------------------------------
1118  * misc
1119  *-------------------------------------------------------------------
1120  */
1121
1122
1123 ExifItem *exif_get_first_item(ExifData *exif)
1124 {
1125         if (exif->items)
1126                 {
1127                 auto ret = static_cast<ExifItem *>(exif->items->data);
1128                 exif->current = exif->items->next;
1129                 return ret;
1130                 }
1131         exif->current = nullptr;
1132         return nullptr;
1133 }
1134
1135 ExifItem *exif_get_next_item(ExifData *exif)
1136 {
1137         if (exif->current)
1138                 {
1139                 auto ret = static_cast<ExifItem *>(exif->current->data);
1140                 exif->current = exif->current->next;
1141                 return ret;
1142                 }
1143         return nullptr;
1144 }
1145
1146 static gint map_file(const gchar *path, void **mapping, gint *size)
1147 {
1148         gint fd;
1149         struct stat fs;
1150
1151         fd = open(path, O_RDONLY);
1152         if (fd == -1)
1153                 {
1154                 perror(path);
1155                 return -1;
1156                 }
1157
1158         if (fstat(fd, &fs) == -1)
1159                 {
1160                 perror(path);
1161                 close(fd);
1162                 return -1;
1163                 }
1164
1165         *size = fs.st_size;
1166
1167         *mapping = mmap(nullptr, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
1168         if (*mapping == MAP_FAILED)
1169                 {
1170                 perror(path);
1171                 close(fd);
1172                 return -1;
1173                 }
1174
1175         close(fd);
1176         return 0;
1177 }
1178
1179 static gint unmap_file(gpointer mapping, gint size)
1180 {
1181         if (munmap(mapping, size) == -1)
1182                 {
1183                 perror("munmap");
1184                 return -1;
1185                 }
1186
1187         return 0;
1188 }
1189
1190 ExifData *exif_get_original(ExifData *processed)
1191 {
1192         return processed;
1193 }
1194
1195 void exif_free(ExifData *exif)
1196 {
1197         if (!exif) return;
1198
1199         g_list_free_full(exif->items, reinterpret_cast<GDestroyNotify>(exif_item_free));
1200         g_free(exif->path);
1201         g_free(exif);
1202 }
1203
1204 ExifData *exif_read(gchar *path, gchar *, GHashTable *)
1205 {
1206         ExifData *exif;
1207         gpointer f;
1208         gint size, res;
1209         gchar *pathl;
1210
1211         if (!path) return nullptr;
1212
1213         pathl = path_from_utf8(path);
1214         if (map_file(pathl, &f, &size) == -1)
1215                 {
1216                 g_free(pathl);
1217                 return nullptr;
1218                 }
1219         g_free(pathl);
1220
1221         exif = g_new0(ExifData, 1);
1222         exif->path = g_strdup(path);
1223
1224         res = exif_jpeg_parse(exif, static_cast<guchar *>(f), size, ExifKnownMarkersList);
1225         if (res == -2)
1226                 {
1227                 res = exif_tiff_parse(exif, static_cast<guchar *>(f), size, ExifKnownMarkersList);
1228                 }
1229
1230         if (res != 0)
1231                 {
1232                 FormatRawExifType exif_type;
1233                 FormatRawExifParseFunc exif_parse_func;
1234                 guint32 offset = 0;
1235
1236                 exif_type = format_raw_exif_offset(static_cast<guchar*>(f), size, &offset, &exif_parse_func);
1237                 switch (exif_type)
1238                         {
1239                         case FORMAT_RAW_EXIF_NONE:
1240                         default:
1241                                 break;
1242                         case FORMAT_RAW_EXIF_TIFF:
1243                                 res = exif_tiff_parse(exif, static_cast<guchar *>(f) + offset, size - offset,
1244                                                       ExifKnownMarkersList);
1245                                 break;
1246                         case FORMAT_RAW_EXIF_JPEG:
1247                                 res = exif_jpeg_parse(exif, static_cast<guchar *>(f) + offset, size - offset,
1248                                                       ExifKnownMarkersList);
1249                                 break;
1250                         case FORMAT_RAW_EXIF_IFD_II:
1251                         case FORMAT_RAW_EXIF_IFD_MM:
1252                                 res = exif_parse_IFD_table(exif, static_cast<guchar *>(f), offset, size - offset,
1253                                                            (exif_type == FORMAT_RAW_EXIF_IFD_II) ?
1254                                                                 EXIF_BYTE_ORDER_INTEL : EXIF_BYTE_ORDER_MOTOROLA,
1255                                                            0, ExifKnownMarkersList);
1256                                 break;
1257                         case FORMAT_RAW_EXIF_PROPRIETARY:
1258                                 if (exif_parse_func)
1259                                         {
1260                                         res = exif_parse_func(static_cast<guchar *>(f) + offset, size - offset, exif);
1261                                         }
1262                                 break;
1263                         }
1264                 }
1265
1266         if (res != 0)
1267                 {
1268                 exif_free(exif);
1269                 exif = nullptr;
1270                 }
1271
1272         unmap_file(f, size);
1273
1274         if (exif) exif->items = g_list_reverse(exif->items);
1275
1276         return exif;
1277 }
1278
1279 ExifItem *exif_get_item(ExifData *exif, const gchar *key)
1280 {
1281         GList *work;
1282
1283         if (!key) return nullptr;
1284
1285         work = exif->items;
1286         while (work)
1287                 {
1288                 ExifItem *item;
1289
1290                 item = static_cast<ExifItem*>(work->data);
1291                 work = work->next;
1292                 if (item->marker->key && strcmp(key, item->marker->key) == 0) return item;
1293                 }
1294         return nullptr;
1295 }
1296
1297 #define EXIF_DATA_AS_TEXT_MAX_COUNT 16
1298
1299
1300 static gchar *exif_item_get_data_as_text_full(ExifItem *item, MetadataFormat format)
1301 {
1302         const ExifMarker *marker;
1303         gpointer data;
1304         GString *string;
1305         gint ne;
1306         gint i;
1307
1308         if (!item) return nullptr;
1309
1310         marker = item->marker;
1311         if (!marker) return nullptr;
1312
1313         data = item->data;
1314         ne = item->elements;
1315         if (ne > EXIF_DATA_AS_TEXT_MAX_COUNT) ne = EXIF_DATA_AS_TEXT_MAX_COUNT;
1316         string = g_string_new("");
1317         switch (item->format)
1318                 {
1319                 case EXIF_FORMAT_UNKNOWN:
1320                         break;
1321                 case EXIF_FORMAT_BYTE_UNSIGNED:
1322                 case EXIF_FORMAT_BYTE:
1323                 case EXIF_FORMAT_UNDEFINED:
1324                         if (ne == 1 && marker->list && format == METADATA_FORMATTED)
1325                                 {
1326                                 gchar *result;
1327                                 guchar val;
1328
1329                                 if (item->format == EXIF_FORMAT_BYTE_UNSIGNED ||
1330                                     item->format == EXIF_FORMAT_UNDEFINED)
1331                                         {
1332                                         val = (static_cast<guchar *>(data))[0];
1333                                         }
1334                                 else
1335                                         {
1336                                         val = static_cast<guchar>((static_cast<gchar *>(data))[0]);
1337                                         }
1338
1339                                 result = exif_text_list_find_value(marker->list, static_cast<guint>(val));
1340                                 string = g_string_append(string, result);
1341                                 g_free(result);
1342                                 }
1343                         else
1344                                 {
1345                                 string = string_append_raw_bytes(string, data, ne);
1346                                 }
1347                         break;
1348                 case EXIF_FORMAT_STRING:
1349                         if (item->data) string = g_string_append(string, (gchar *)(item->data));
1350                         break;
1351                 case EXIF_FORMAT_SHORT_UNSIGNED:
1352                         if (ne == 1 && marker->list && format == METADATA_FORMATTED)
1353                                 {
1354                                 gchar *result;
1355
1356                                 result = exif_text_list_find_value(marker->list, (static_cast<guint16 *>(data))[0]);
1357                                 string = g_string_append(string, result);
1358                                 g_free(result);
1359                                 }
1360                         else for (i = 0; i < ne; i++)
1361                                 {
1362                                 g_string_append_printf(string, "%s%hd", (i > 0) ? ", " : "",
1363                                                         (static_cast<guint16 *>(data))[i]);
1364                                 }
1365                         break;
1366                 case EXIF_FORMAT_LONG_UNSIGNED:
1367                         for (i = 0; i < ne; i++)
1368                                 {
1369                                 g_string_append_printf(string, "%s%ld", (i > 0) ? ", " : "",
1370                                                         static_cast<gulong>((static_cast<guint32 *>(data))[i]));
1371                                 }
1372                         break;
1373                 case EXIF_FORMAT_RATIONAL_UNSIGNED:
1374                         for (i = 0; i < ne; i++)
1375                                 {
1376                                 ExifRational *r;
1377
1378                                 r = &(static_cast<ExifRational *>(data))[i];
1379                                 g_string_append_printf(string, "%s%ld/%ld", (i > 0) ? ", " : "",
1380                                                         static_cast<gulong>(r->num), static_cast<gulong>(r->den));
1381                                 }
1382                         break;
1383                 case EXIF_FORMAT_SHORT:
1384                         for (i = 0; i < ne; i++)
1385                                 {
1386                                 g_string_append_printf(string, "%s%hd", (i > 0) ? ", " : "",
1387                                                         (static_cast<gint16 *>(data))[i]);
1388                                 }
1389                         break;
1390                 case EXIF_FORMAT_LONG:
1391                         for (i = 0; i < ne; i++)
1392                                 {
1393                                 g_string_append_printf(string, "%s%ld", (i > 0) ? ", " : "",
1394                                                         static_cast<glong>((static_cast<gint32 *>(data))[i]));
1395                                 }
1396                         break;
1397                 case EXIF_FORMAT_RATIONAL:
1398                         for (i = 0; i < ne; i++)
1399                                 {
1400                                 ExifRational *r;
1401
1402                                 r = &(static_cast<ExifRational *>(data))[i];
1403                                 g_string_append_printf(string, "%s%ld/%ld", (i > 0) ? ", " : "",
1404                                                         static_cast<glong>(r->num), static_cast<glong>(r->den));
1405                                 }
1406                         break;
1407                 case EXIF_FORMAT_FLOAT:
1408                         for (i = 0; i < ne; i++)
1409                                 {
1410                                 g_string_append_printf(string, "%s%f", (i > 0) ? ", " : "",
1411                                                         (static_cast<float *>(data))[i]);
1412                                 }
1413                         break;
1414                 case EXIF_FORMAT_DOUBLE:
1415                         for (i = 0; i < ne; i++)
1416                                 {
1417                                 g_string_append_printf(string, "%s%f", (i > 0) ? ", " : "",
1418                                                         (static_cast<gdouble *>(data))[i]);
1419                                 }
1420                         break;
1421                 }
1422
1423         if (item->elements > EXIF_DATA_AS_TEXT_MAX_COUNT &&
1424             item->format != EXIF_FORMAT_STRING)
1425                 {
1426                 g_string_append(string, " ...");
1427                 }
1428
1429         return g_string_free(string, FALSE);
1430 }
1431
1432 gchar *exif_item_get_string(ExifItem *item, gint)
1433 {
1434         return exif_item_get_data_as_text_full(item, METADATA_PLAIN);
1435 }
1436
1437 gchar *exif_item_get_data_as_text(ExifItem *item, ExifData *)
1438 {
1439         return exif_item_get_data_as_text_full(item, METADATA_FORMATTED);
1440 }
1441
1442 gint exif_item_get_integer(ExifItem *item, gint *value)
1443 {
1444         if (!item) return FALSE;
1445         if (!item->elements) return FALSE;
1446
1447         switch (item->format)
1448                 {
1449                 case EXIF_FORMAT_SHORT:
1450                         *value = static_cast<gint>((static_cast<gint16 *>(item->data))[0]);
1451                         return TRUE;
1452                         break;
1453                 case EXIF_FORMAT_SHORT_UNSIGNED:
1454                         *value = static_cast<gint>((static_cast<guint16 *>(item->data))[0]);
1455                         return TRUE;
1456                         break;
1457                 case EXIF_FORMAT_LONG:
1458                         *value = static_cast<gint>((static_cast<gint32 *>(item->data))[0]);
1459                         return TRUE;
1460                         break;
1461                 case EXIF_FORMAT_LONG_UNSIGNED: /**< @FIXME overflow possible */
1462                         *value = static_cast<gint>((static_cast<guint32 *>(item->data))[0]);
1463                         return TRUE;
1464                 default:
1465                         /* all other type return FALSE */
1466                         break;
1467                 }
1468         return FALSE;
1469 }
1470
1471
1472 ExifRational *exif_item_get_rational(ExifItem *item, gint *sign, guint n)
1473 {
1474         if (!item) return nullptr;
1475         if (n >= item->elements) return nullptr;
1476
1477         if (item->format == EXIF_FORMAT_RATIONAL ||
1478             item->format == EXIF_FORMAT_RATIONAL_UNSIGNED)
1479                 {
1480                 if (sign) *sign = (item->format == EXIF_FORMAT_RATIONAL);
1481                 return &(static_cast<ExifRational *>(item->data))[n];
1482                 }
1483
1484         return nullptr;
1485 }
1486
1487 gchar *exif_get_tag_description_by_key(const gchar *key)
1488 {
1489         gint i;
1490
1491         if (!key) return nullptr;
1492
1493         i = 0;
1494         while (ExifKnownMarkersList[i].tag > 0)
1495                 {
1496                 if (strcmp(key, ExifKnownMarkersList[i].key) == 0) return g_strdup(_(ExifKnownMarkersList[i].description));
1497                 i++;
1498                 }
1499
1500         i = 0;
1501         while (ExifKnownGPSInfoMarkersList[i].tag > 0)
1502         {
1503            if (strcmp(key, ExifKnownGPSInfoMarkersList[i].key) == 0) return g_strdup(_(ExifKnownGPSInfoMarkersList[i].description));
1504            i++;
1505         }
1506
1507         return nullptr;
1508 }
1509
1510 static void exif_write_item(FILE *f, ExifItem *item, ExifData *exif)
1511 {
1512         gchar *text;
1513
1514         text = exif_item_get_data_as_text(item, exif);
1515         if (text)
1516                 {
1517                 gchar *tag = exif_item_get_tag_name(item);
1518                 g_fprintf(f, "%4x %9s %30s %s\n", item->tag, ExifFormatList[item->format].short_name,
1519                         tag, text);
1520                 g_free(tag);
1521                 }
1522         g_free(text);
1523 }
1524
1525 void exif_write_data_list(ExifData *exif, FILE *f, gint human_readable_list)
1526 {
1527         if (!f || !exif) return;
1528
1529         g_fprintf(f, " tag   format                             key value\n");
1530         g_fprintf(f, "----------------------------------------------------\n");
1531
1532         if (human_readable_list)
1533                 {
1534                 gint i;
1535
1536                 i = 0;
1537                 while (ExifFormattedList[i].key)
1538                         {
1539                         gchar *text;
1540
1541                         text = exif_get_formatted_by_key(exif, ExifFormattedList[i].key, nullptr);
1542                         if (text)
1543                                 {
1544                                 g_fprintf(f, "     %9s %30s %s\n", "string", ExifFormattedList[i].key, text);
1545                                 }
1546                         i++;
1547                         }
1548                 }
1549         else
1550                 {
1551                 GList *work;
1552
1553                 work = exif->items;
1554                 while (work)
1555                         {
1556                         ExifItem *item;
1557
1558                         item = static_cast<ExifItem*>(work->data);
1559                         work = work->next;
1560
1561                         exif_write_item(f, item, exif);
1562                         }
1563                 }
1564         g_fprintf(f, "----------------------------------------------------\n");
1565 }
1566
1567 gboolean exif_write(ExifData *)
1568 {
1569         log_printf("Not compiled with EXIF write support\n");
1570         return FALSE;
1571 }
1572
1573 gboolean exif_write_sidecar(ExifData *, gchar *)
1574 {
1575         log_printf("Not compiled with EXIF write support\n");
1576         return FALSE;
1577 }
1578
1579
1580 gint exif_update_metadata(ExifData *, const gchar *, const GList *)
1581 {
1582         return 0;
1583 }
1584
1585 GList *exif_get_metadata(ExifData *exif, const gchar *key, MetadataFormat format)
1586 {
1587         gchar *str;
1588         ExifItem *item;
1589
1590         if (!key) return nullptr;
1591
1592         /* convert xmp key to exif key */
1593         if (strcmp(key, "Xmp.tiff.Orientation") == 0) key = "Exif.Image.Orientation";
1594
1595         if (format == METADATA_FORMATTED)
1596                 {
1597                 gchar *text;
1598                 gint key_valid;
1599                 text = exif_get_formatted_by_key(exif, key, &key_valid);
1600                 if (key_valid) return g_list_append(nullptr, text);
1601                 }
1602
1603         item = exif_get_item(exif, key);
1604         if (!item) return nullptr;
1605
1606         str = exif_item_get_data_as_text_full(item, format);
1607
1608         if (!str) return nullptr;
1609
1610         return g_list_append(nullptr, str);
1611 }
1612
1613 struct UnmapData
1614 {
1615         guchar *ptr;
1616         guchar *map_data;
1617         size_t map_len;
1618 };
1619
1620 static GList *exif_unmap_list = nullptr;
1621
1622 guchar *exif_get_preview(ExifData *exif, guint *data_len, gint, gint)
1623 {
1624         guint offset;
1625         const gchar* path;
1626         struct stat st;
1627         guchar *map_data;
1628         size_t map_len;
1629         int fd;
1630
1631         if (!exif) return nullptr;
1632         path = exif->path;
1633
1634         fd = open(path, O_RDONLY);
1635
1636
1637         if (fd == -1)
1638                 {
1639                 return nullptr;
1640                 }
1641
1642         if (fstat(fd, &st) == -1)
1643                 {
1644                 close(fd);
1645                 return nullptr;
1646                 }
1647         map_len = st.st_size;
1648         map_data = static_cast<guchar *>(mmap(nullptr, map_len, PROT_READ, MAP_PRIVATE, fd, 0));
1649         close(fd);
1650
1651         if (map_data == MAP_FAILED)
1652                 {
1653                 return nullptr;
1654                 }
1655
1656         if (format_raw_img_exif_offsets(map_data, map_len, &offset, nullptr) && offset)
1657                 {
1658                 UnmapData *ud;
1659
1660                 DEBUG_1("%s: offset %u", path, offset);
1661
1662                 *data_len = map_len - offset;
1663                 ud = g_new(UnmapData, 1);
1664                 ud->ptr = map_data + offset;
1665                 ud->map_data = map_data;
1666                 ud->map_len = map_len;
1667
1668                 exif_unmap_list = g_list_prepend(exif_unmap_list, ud);
1669                 return ud->ptr;
1670                 }
1671
1672         munmap(map_data, map_len);
1673         return nullptr;
1674
1675 }
1676
1677 void exif_free_preview(const guchar *buf)
1678 {
1679         GList *work = exif_unmap_list;
1680
1681         while (work)
1682                 {
1683                 auto ud = static_cast<UnmapData *>(work->data);
1684                 if (ud->ptr == buf)
1685                         {
1686                         exif_unmap_list = g_list_remove_link(exif_unmap_list, work);
1687                         g_free(ud);
1688                         return;
1689                         }
1690                 work = work->next;
1691                 }
1692         g_assert_not_reached();
1693 }
1694
1695 void exif_init()
1696 {
1697 }
1698 #else
1699 using dummy_variable = int;
1700 #endif
1701 /* not HAVE_EXIV2 */
1702 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */