src/exif.c

   1 /*
   2  *  GQView
   3  *  (C) 2006 John Ellis
   4  *
   5  *  Authors:
   6  *    Support for Exif file format, originally written by Eric Swalens.
   7  *    Modified by Quy Tonthat
   8  *
   9  *    Reimplemented with generic data storage by John Ellis (Nov 2003)
  10  *
  11  *  The tags were added with information from the FREE document:
  12  *     http://www.ba.wakwak.com/~tsuruzoh/Computer/Digicams/exif-e.html
  13  *
  14  *  For the official Exif Format, please refer to:
  15  *     http://www.exif.org
  16  *     http://www.exif.org/specifications.html (PDF spec sheets)
  17  *
  18  *  Notes:
  19  *     Additional tag formats should be added to the proper
  20  *     location in ExifKnownMarkersList[].
  21  *
  22  *     Human readable ouput (that needs additional processing of data to
  23  *     be useable) can be defined by adding a key to ExifFormattedList[],
  24  *     then handling that tag in the function exif_get_formatted_by_key().
  25  *     The human readable formatted keys must begin with the character 'f'.
  26  *
  27  *  Unsupported at this time:
  28  *     IFD1 (thumbnail)
  29  *     MakerNote
  30  *     GPSInfo
  31  *
  32  *  TODO:
  33  *     Convert data to useable form in the ??_as_text function for:
  34  *        ComponentsConfiguration
  35  *        UserComment (convert this to UTF-8?)
  36  *
  37
  38     This program is free software; you can redistribute it and/or modify
  39     it under the terms of the GNU General Public License as published by
  40     the Free Software Foundation; either version 2 of the License, or
  41     (at your option) any later version.
  42
  43     This program is distributed in the hope that it will be useful,
  44     but WITHOUT ANY WARRANTY; without even the implied warranty of
  45     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  46     GNU General Public License for more details.
  47
  48     You should have received a copy of the GNU General Public License
  49     along with this program; if not, write to the Free Software
  50     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  51 */
  52
  53 #ifdef HAVE_CONFIG_H
  54 #  include "config.h"
  55 #endif
  56
  57 #include <stdio.h>
  58 #include <string.h>
  59 #include <fcntl.h>
  60 #include <unistd.h>
  61 #include <sys/types.h>
  62 #include <sys/stat.h>
  63 #include <sys/mman.h>
  64 #include <math.h>
  65
  66 #include <glib.h>
  67
  68 #include "intl.h"
  69
  70 #include "exif.h"
  71
  72 #include "format_raw.h"
  73 #include "ui_fileops.h"
  74
  75
  76 /*
  77  *-----------------------------------------------------------------------------
  78  * Tag formats
  79  *-----------------------------------------------------------------------------
  80  */
  81
  82 ExifFormatAttrib ExifFormatList[] = {
  83         { EXIF_FORMAT_UNKNOWN,          1, "unknown",   "unknown" },
  84         { EXIF_FORMAT_BYTE_UNSIGNED,    1, "ubyte",     "unsigned byte" },
  85         { EXIF_FORMAT_STRING,           1, "string",    "string" },
  86         { EXIF_FORMAT_SHORT_UNSIGNED,   2, "ushort",    "unsigned short" },
  87         { EXIF_FORMAT_LONG_UNSIGNED,    4, "ulong",     "unsigned long" },
  88         { EXIF_FORMAT_RATIONAL_UNSIGNED,8, "urational", "unsigned rational" },
  89         { EXIF_FORMAT_BYTE,             1, "byte",      "byte" },
  90         { EXIF_FORMAT_UNDEFINED,        1, "undefined", "undefined" },
  91         { EXIF_FORMAT_SHORT,            2, "sshort",    "signed short" },
  92         { EXIF_FORMAT_LONG,             4, "slong",     "signed long" },
  93         { EXIF_FORMAT_RATIONAL,         8, "srational", "signed rational" },
  94         { EXIF_FORMAT_FLOAT,            4, "float",     "float" },
  95         { EXIF_FORMAT_DOUBLE,           8, "double",    "double" },
  96         { -1, 0, NULL }
  97 };
  98
  99 /* tags that are special, or need special treatment */
 100 #define TAG_EXIFOFFSET          0x8769
 101 #define TAG_EXIFMAKERNOTE       0x927c
 102
 103
 104 /*
 105  *-----------------------------------------------------------------------------
 106  * Data
 107  *-----------------------------------------------------------------------------
 108  */
 109
 110 static ExifTextList ExifOrientationList[] = {
 111         { EXIF_ORIENTATION_UNKNOWN,     N_("unknown") },
 112         { EXIF_ORIENTATION_TOP_LEFT,    N_("top left") },
 113         { EXIF_ORIENTATION_TOP_RIGHT,   N_("top right") },
 114         { EXIF_ORIENTATION_BOTTOM_RIGHT,N_("bottom right") },
 115         { EXIF_ORIENTATION_BOTTOM_LEFT, N_("bottom left") },
 116         { EXIF_ORIENTATION_LEFT_TOP,    N_("left top") },
 117         { EXIF_ORIENTATION_RIGHT_TOP,   N_("right top") },
 118         { EXIF_ORIENTATION_RIGHT_BOTTOM,N_("right bottom") },
 119         { EXIF_ORIENTATION_LEFT_BOTTOM, N_("left bottom") },
 120         EXIF_TEXT_LIST_END
 121 };
 122
 123 static ExifTextList ExifUnitList[] = {
 124         { EXIF_UNIT_UNKNOWN,    N_("unknown") },
 125         { EXIF_UNIT_NOUNIT,     "" },
 126         { EXIF_UNIT_INCH,       N_("inch") },
 127         { EXIF_UNIT_CENTIMETER, N_("centimeter") },
 128         EXIF_TEXT_LIST_END
 129 };
 130
 131 static ExifTextList ExifYCbCrPosList[] = {
 132         { 1,    "center" },
 133         { 2,    "datum" },
 134         EXIF_TEXT_LIST_END
 135 };
 136
 137 static ExifTextList ExifMeteringModeList[] = {
 138         { 0,    N_("unknown") },
 139         { 1,    N_("average") },
 140         { 2,    N_("center weighted") },
 141         { 3,    N_("spot") },
 142         { 4,    N_("multi-spot") },
 143         { 5,    N_("multi-segment") },
 144         { 6,    N_("partial") },
 145         { 255,  N_("other") },
 146         EXIF_TEXT_LIST_END
 147 };
 148
 149 static ExifTextList ExifExposureProgramList[] = {
 150         { 0,    N_("not defined") },
 151         { 1,    N_("manual") },
 152         { 2,    N_("normal") },
 153         { 3,    N_("aperture") },
 154         { 4,    N_("shutter") },
 155         { 5,    N_("creative") },
 156         { 6,    N_("action") },
 157         { 7,    N_("portrait") },
 158         { 8,    N_("landscape") },
 159         EXIF_TEXT_LIST_END
 160 };
 161
 162 static ExifTextList ExifLightSourceList[] = {
 163         { 0,    N_("unknown") },
 164         { 1,    N_("daylight") },
 165         { 2,    N_("fluorescent") },
 166         { 3,    N_("tungsten (incandescent)") },
 167         { 4,    N_("flash") },
 168         { 9,    "fine weather" },
 169         { 10,   "cloudy weather" },
 170         { 11,   "shade" },
 171         { 12,   "daylight fluorescent" },
 172         { 13,   "day white fluorescent" },
 173         { 14,   "cool white fluorescent" },
 174         { 15,   "while fluorescent" },
 175         { 17,   "standard light A" },
 176         { 18,   "standard light B" },
 177         { 19,   "standard light C" },
 178         { 20,   "D55" },
 179         { 21,   "D65" },
 180         { 22,   "D75" },
 181         { 23,   "D50" },
 182         { 24,   "ISO studio tungsten" },
 183         { 255,  N_("other") },
 184         EXIF_TEXT_LIST_END
 185 };
 186
 187 static ExifTextList ExifFlashList[] = {
 188         { 0,    N_("no") },
 189         { 1,    N_("yes") },
 190         { 5,    N_("yes, not detected by strobe") },
 191         { 7,    N_("yes, detected by strobe") },
 192         EXIF_TEXT_LIST_END
 193 };
 194
 195 static ExifTextList ExifColorSpaceList[] = {
 196         { 1,    "sRGB" },
 197         { 65535,"uncalibrated" },
 198         EXIF_TEXT_LIST_END
 199 };
 200
 201 static ExifTextList ExifSensorList[] = {
 202         { 1,    "not defined" },
 203         { 2,    "1 chip color area" },
 204         { 2,    "2 chip color area" },
 205         { 4,    "3 chip color area" },
 206         { 5,    "color sequential area" },
 207         { 7,    "trilinear" },
 208         { 8,    "color sequential linear" },
 209         EXIF_TEXT_LIST_END
 210 };
 211
 212 static ExifTextList ExifSourceList[] = {
 213         { 3,    "digital still camera" },
 214         EXIF_TEXT_LIST_END
 215 };
 216
 217 static ExifTextList ExifSceneList[] = {
 218         { 1,    "direct photo" },
 219         EXIF_TEXT_LIST_END
 220 };
 221
 222 static ExifTextList ExifCustRenderList[] = {
 223         { 0,    "normal" },
 224         { 1,    "custom" },
 225         EXIF_TEXT_LIST_END
 226 };
 227
 228 static ExifTextList ExifExposureModeList[] = {
 229         { 0,    "auto" },
 230         { 1,    "manual" },
 231         { 2,    "auto bracket" },
 232         EXIF_TEXT_LIST_END
 233 };
 234
 235 static ExifTextList ExifWhiteBalanceList[] = {
 236         { 0,    "auto" },
 237         { 1,    "manual" },
 238         EXIF_TEXT_LIST_END
 239 };
 240
 241 static ExifTextList ExifSceneCaptureList[] = {
 242         { 0,    "standard" },
 243         { 1,    "landscape" },
 244         { 2,    "portrait" },
 245         { 3,    "night scene" },
 246         EXIF_TEXT_LIST_END
 247 };
 248
 249 static ExifTextList ExifGainControlList[] = {
 250         { 0,    "none" },
 251         { 1,    "low gain up" },
 252         { 2,    "high gain up" },
 253         { 3,    "low gain down" },
 254         { 4,    "high gain down" },
 255         EXIF_TEXT_LIST_END
 256 };
 257
 258 static ExifTextList ExifContrastList[] = {
 259         { 0,    "normal" },
 260         { 1,    "soft" },
 261         { 2,    "hard" },
 262         EXIF_TEXT_LIST_END
 263 };
 264
 265 static ExifTextList ExifSaturationList[] = {
 266         { 0,    "normal" },
 267         { 1,    "low" },
 268         { 2,    "high" },
 269         EXIF_TEXT_LIST_END
 270 };
 271
 272 static ExifTextList ExifSharpnessList[] = {
 273         { 0,    "normal" },
 274         { 1,    "soft" },
 275         { 2,    "hard" },
 276         EXIF_TEXT_LIST_END
 277 };
 278
 279 static ExifTextList ExifSubjectRangeList[] = {
 280         { 0,    "unknown" },
 281         { 1,    "macro" },
 282         { 2,    "close" },
 283         { 3,    "distant" },
 284         EXIF_TEXT_LIST_END
 285 };
 286
 287 ExifMarker ExifKnownMarkersList[] = {
 288 { 0x010e, EXIF_FORMAT_STRING, -1,               "ImageDescription",     N_("Image description"), NULL },
 289 { 0x010f, EXIF_FORMAT_STRING, -1,               "Make",                 "Camera make", NULL },
 290 { 0x0110, EXIF_FORMAT_STRING, -1,               "Model",                "Camera model", NULL },
 291 { 0x0112, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Orientation",          N_("Orientation"), ExifOrientationList },
 292 { 0x011a, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "XResolution",          "X resolution", NULL },
 293 { 0x011b, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "YResolution",          "Y Resolution", NULL },
 294 { 0x0128, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "ResolutionUnit",       "Resolution units", ExifUnitList },
 295 { 0x0131, EXIF_FORMAT_STRING, -1,               "Software",             "Firmware", NULL },
 296 { 0x0132, EXIF_FORMAT_STRING, 20,               "DateTime",             N_("Date"), NULL },
 297 { 0x013e, EXIF_FORMAT_RATIONAL_UNSIGNED, 2,     "WhitePoint",           "White point", NULL },
 298 { 0x013f, EXIF_FORMAT_RATIONAL_UNSIGNED, 6,     "PrimaryChromaticities","Primary chromaticities", NULL },
 299 { 0x0211, EXIF_FORMAT_RATIONAL_UNSIGNED, 3,     "YCbCrCoefficients",    "YCbCy coefficients", NULL },
 300 { 0x0213, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "YCbCrPositioning",     "YCbCr positioning", ExifYCbCrPosList },
 301 { 0x0214, EXIF_FORMAT_RATIONAL_UNSIGNED, 6,     "ReferenceBlackWhite",  "Black white reference", NULL },
 302 { 0x8298, EXIF_FORMAT_STRING, -1,               "Copyright",            N_("Copyright"), NULL },
 303 { 0x8769, EXIF_FORMAT_LONG_UNSIGNED, 1,         "ExifOffset",           "SubIFD Exif offset", NULL },
 304         /* subIFD follows */
 305 { 0x829a, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "ExposureTime",         "Exposure time (seconds)", NULL },
 306 { 0x829d, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "FNumber",              "FNumber", NULL },
 307 { 0x8822, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "ExposureProgram",      N_("Exposure program"), ExifExposureProgramList },
 308 { 0x8824, EXIF_FORMAT_STRING, -1,               "SpectralSensitivity",  "Spectral Sensitivity", NULL },
 309 { 0x8827, EXIF_FORMAT_SHORT_UNSIGNED, -1,       "ISOSpeedRatings",      N_("ISO sensitivity"), NULL },
 310 { 0x8828, EXIF_FORMAT_UNDEFINED, -1,            "OECF",                 "Optoelectric conversion factor", NULL },
 311 { 0x9000, EXIF_FORMAT_UNDEFINED, 4,             "ExifVersion",          "Exif version", NULL },
 312 { 0x9003, EXIF_FORMAT_STRING, 20,               "DateTimeOriginal",     N_("Date original"), NULL },
 313 { 0x9004, EXIF_FORMAT_STRING, 20,               "DateTimeDigitized",    N_("Date digitized"), NULL },
 314 { 0x9101, EXIF_FORMAT_UNDEFINED, -1,            "ComponentsConfiguration","Pixel format", NULL },
 315 { 0x9102, EXIF_FORMAT_RATIONAL_UNSIGNED,1,      "CompressedBitsPerPixel","Compression ratio", NULL },
 316 { 0x9201, EXIF_FORMAT_RATIONAL, 1,              "ShutterSpeedValue",    N_("Shutter speed"), NULL },
 317 { 0x9202, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "ApertureValue",        N_("Aperture"), NULL },
 318 { 0x9203, EXIF_FORMAT_RATIONAL, 1,              "BrightnessValue",      "Brightness", NULL },
 319 { 0x9204, EXIF_FORMAT_RATIONAL, 1,              "ExposureBiasValue",    N_("Exposure bias"), NULL },
 320 { 0x9205, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "MaxApertureValue",     "Maximum aperture", NULL },
 321 { 0x9206, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "SubjectDistance",      N_("Subject distance"), NULL },
 322 { 0x9207, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "MeteringMode",         N_("Metering mode"), ExifMeteringModeList },
 323 { 0x9208, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "LightSource",          N_("Light source"), ExifLightSourceList },
 324 { 0x9209, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Flash",                N_("Flash"), ExifFlashList },
 325 { 0x920a, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "FocalLength",          N_("Focal length"), NULL },
 326 { 0x9214, EXIF_FORMAT_SHORT_UNSIGNED, -1,       "SubjectArea",          "Subject area", NULL },
 327 { 0x927c, EXIF_FORMAT_UNDEFINED, -1,            "MakerNote",            "MakerNote", NULL },
 328 { 0x9286, EXIF_FORMAT_UNDEFINED, -1,            "UserComment",          "UserComment", NULL },
 329 { 0x9290, EXIF_FORMAT_STRING, -1,               "SubsecTime",           "Subsecond time", NULL },
 330 { 0x9291, EXIF_FORMAT_STRING, -1,               "SubsecTimeOriginal",   "Subsecond time original", NULL },
 331 { 0x9292, EXIF_FORMAT_STRING, -1,               "SubsecTimeDigitized",  "Subsecond time digitized", NULL },
 332 { 0xa000, EXIF_FORMAT_UNDEFINED, 4,             "FlashPixVersion",      "FlashPix version", NULL },
 333 { 0xa001, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "ColorSpace",           "Colorspace", ExifColorSpaceList },
 334         /* ExifImageWidth, ExifImageHeight can also be unsigned short */
 335 { 0xa002, EXIF_FORMAT_LONG_UNSIGNED, 1,         "ExifImageWidth",       N_("Width"), NULL },
 336 { 0xa003, EXIF_FORMAT_LONG_UNSIGNED, 1,         "ExifImageHeight",      N_("Height"), NULL },
 337 { 0xa004, EXIF_FORMAT_STRING, -1,               "RelatedSoundFile",     "Audio data", NULL },
 338 { 0xa005, EXIF_FORMAT_LONG_UNSIGNED, 1,         "ExifInteroperabilityOffset", "ExifR98 extension", NULL },
 339 { 0xa20b, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "FlashEnergy",          "Flash strength", NULL },
 340 { 0xa20c, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "SpatialFrequencyResponse","Spatial frequency response", NULL },
 341 { 0xa20e, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "FocalPlaneXResolution", "X Pixel density", NULL },
 342 { 0xa20f, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "FocalPlaneYResolution", "Y Pixel density", NULL },
 343 { 0xa210, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "FocalPlaneResolutionUnit", "Pixel density units", ExifUnitList },
 344 { 0x0214, EXIF_FORMAT_SHORT_UNSIGNED, 2,        "SubjectLocation",      "Subject location", NULL },
 345 { 0xa215, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "ExposureIndex",        N_("ISO sensitivity"), NULL },
 346 { 0xa217, EXIF_FORMAT_SHORT_UNSIGNED, -1,       "SensingMethod",        "Sensor type", ExifSensorList },
 347 { 0xa300, EXIF_FORMAT_UNDEFINED, 1,             "FileSource",           "Source type", ExifSourceList },
 348 { 0xa301, EXIF_FORMAT_UNDEFINED, 1,             "SceneType",            "Scene type", ExifSceneList },
 349 { 0xa302, EXIF_FORMAT_UNDEFINED, -1,            "CFAPattern",           "Color filter array pattern", NULL },
 350         /* tags a4xx were added for Exif 2.2 (not just these - some above, as well) */
 351 { 0xa401, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "CustomRendered",       "Render process", ExifCustRenderList },
 352 { 0xa402, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "ExposureMode",         "Exposure mode", ExifExposureModeList },
 353 { 0xa403, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "WhiteBalance",         "White balance", ExifWhiteBalanceList },
 354 { 0xa404, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "DigitalZoomRatio",     "Digital zoom ratio", NULL },
 355 { 0xa405, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "FocalLength35mmFilm",  "Focal length (35mm)", NULL },
 356 { 0xa406, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "SceneCapturetype",     "Scene capture type", ExifSceneCaptureList },
 357 { 0xa407, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "GainControl",          "Gain control", ExifGainControlList },
 358 { 0xa408, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Contrast",             "Contrast", ExifContrastList },
 359 { 0xa409, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Saturation",           "Saturation", ExifSaturationList },
 360 { 0xa40a, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Sharpness",            "Sharpness", ExifSharpnessList },
 361 { 0xa40b, EXIF_FORMAT_UNDEFINED, -1,            "DeviceSettingDescription","Device setting", NULL },
 362 { 0xa40c, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "SubjectDistanceRange", "Subject range", ExifSubjectRangeList },
 363 { 0xa420, EXIF_FORMAT_STRING, -1,               "ImageUniqueID",        "Image serial number", NULL },
 364         /* place known, but undocumented or lesser used tags here */
 365 { 0x00fe, EXIF_FORMAT_LONG_UNSIGNED, 1,         "NewSubfileType",       NULL, NULL },
 366 { 0x00ff, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "SubfileType",          NULL, NULL },
 367 { 0x012d, EXIF_FORMAT_SHORT_UNSIGNED, 3,        "TransferFunction",     NULL, NULL },
 368 { 0x013b, EXIF_FORMAT_STRING, -1,               "Artist",               "Artist", NULL },
 369 { 0x013d, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Predictor",            NULL, NULL },
 370 { 0x0142, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "TileWidth",            NULL, NULL },
 371 { 0x0143, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "TileLength",           NULL, NULL },
 372 { 0x0144, EXIF_FORMAT_LONG_UNSIGNED, -1,        "TileOffsets",          NULL, NULL },
 373 { 0x0145, EXIF_FORMAT_SHORT_UNSIGNED, -1,       "TileByteCounts",       NULL, NULL },
 374 { 0x014a, EXIF_FORMAT_LONG_UNSIGNED, -1,        "SubIFDs",              NULL, NULL },
 375 { 0x015b, EXIF_FORMAT_UNDEFINED, -1,            "JPEGTables",           NULL, NULL },
 376 { 0x828d, EXIF_FORMAT_SHORT_UNSIGNED, 2,        "CFARepeatPatternDim",  NULL, NULL },
 377 { 0x828e, EXIF_FORMAT_BYTE_UNSIGNED, -1,        "CFAPattern",           NULL, NULL },
 378 { 0x828f, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "BatteryLevel",         NULL, NULL },
 379 { 0x83bb, EXIF_FORMAT_LONG_UNSIGNED, -1,        "IPTC/NAA",             NULL, NULL },
 380 { 0x8773, EXIF_FORMAT_UNDEFINED, -1,            "ColorProfile",         NULL, NULL },
 381 { 0x8825, EXIF_FORMAT_LONG_UNSIGNED, 1,         "GPSInfo",              "SubIFD GPS offset", NULL },
 382 { 0x8829, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Interlace",            NULL, NULL },
 383 { 0x882a, EXIF_FORMAT_SHORT, 1,                 "TimeZoneOffset",       NULL, NULL },
 384 { 0x882b, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "SelfTimerMode",        NULL, NULL },
 385 { 0x920b, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "FlashEnergy",          NULL, NULL },
 386 { 0x920c, EXIF_FORMAT_UNDEFINED, -1,            "SpatialFrequencyResponse", NULL, NULL },
 387 { 0x920d, EXIF_FORMAT_UNDEFINED, -1,            "Noise",                NULL, NULL },
 388 { 0x9211, EXIF_FORMAT_LONG_UNSIGNED, 1,         "ImageNumber",          NULL, NULL },
 389 { 0x9212, EXIF_FORMAT_STRING, 1,                "SecurityClassification", NULL, NULL },
 390 { 0x9213, EXIF_FORMAT_STRING, -1,               "ImageHistory",         NULL, NULL },
 391 { 0x9215, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "ExposureIndex",        NULL, NULL },
 392 { 0x9216, EXIF_FORMAT_BYTE_UNSIGNED, 4,         "TIFF/EPStandardID",    NULL, NULL },
 393
 394 EXIF_MARKER_LIST_END
 395 };
 396
 397 ExifMarker ExifUnknownMarkersList[] = {
 398 { 0x0000, EXIF_FORMAT_UNKNOWN, 0,               "unknown",      NULL, NULL },
 399 { 0x0000, EXIF_FORMAT_BYTE_UNSIGNED, -1,        "unknown",      NULL, NULL },
 400 { 0x0000, EXIF_FORMAT_STRING, -1,               "unknown",      NULL, NULL },
 401 { 0x0000, EXIF_FORMAT_SHORT_UNSIGNED, -1,       "unknown",      NULL, NULL },
 402 { 0x0000, EXIF_FORMAT_LONG_UNSIGNED, -1,        "unknown",      NULL, NULL },
 403 { 0x0000, EXIF_FORMAT_RATIONAL_UNSIGNED, -1,    "unknown",      NULL, NULL },
 404 { 0x0000, EXIF_FORMAT_BYTE, -1,                 "unknown",      NULL, NULL },
 405 { 0x0000, EXIF_FORMAT_UNDEFINED, -1,            "unknown",      NULL, NULL },
 406 { 0x0000, EXIF_FORMAT_SHORT, -1,                "unknown",      NULL, NULL },
 407 { 0x0000, EXIF_FORMAT_LONG, -1,                 "unknown",      NULL, NULL },
 408 { 0x0000, EXIF_FORMAT_RATIONAL, -1,             "unknown",      NULL, NULL },
 409 { 0x0000, EXIF_FORMAT_FLOAT, -1,                "unknown",      NULL, NULL },
 410 { 0x0000, EXIF_FORMAT_DOUBLE, -1,               "unknown",      NULL, NULL },
 411 };
 412
 413 /* human readable key list */
 414
 415 ExifFormattedText ExifFormattedList[] = {
 416         { "fCamera",            N_("Camera") },
 417         { "fDateTime",          N_("Date") },
 418         { "fShutterSpeed",      N_("Shutter speed") },
 419         { "fAperture",          N_("Aperture") },
 420         { "fExposureBias",      N_("Exposure bias") },
 421         { "fISOSpeedRating",    N_("ISO sensitivity") },
 422         { "fFocalLength",       N_("Focal length") },
 423         { "fSubjectDistance",   N_("Subject distance") },
 424         { "fFlash",             N_("Flash") },
 425         { "fResolution",        N_("Resolution") },
 426         { NULL, NULL }
 427 };
 428
 429
 430 static const ExifMarker *exif_marker_from_tag(guint16 tag, const ExifMarker *list);
 431
 432 /*
 433  *-----------------------------------------------------------------------------
 434  * ExifItem
 435  *-----------------------------------------------------------------------------
 436  */
 437
 438 ExifItem *exif_item_new(ExifFormatType format, guint tag,
 439                         guint elements, const ExifMarker *marker)
 440 {
 441         ExifItem *item;
 442
 443         item = g_new0(ExifItem, 1);
 444         item->format = format;
 445         item->tag = tag;
 446         item->marker = marker;
 447         item->elements = elements;
 448         item->data = NULL;
 449         item->data_len = 0;
 450
 451         switch (format)
 452                 {
 453                 case EXIF_FORMAT_UNKNOWN:
 454                         /* unknown, data is NULL */
 455                         return item;
 456                         break;
 457                 case EXIF_FORMAT_BYTE_UNSIGNED:
 458                         item->data_len = sizeof(char) * elements;
 459                         break;
 460                 case EXIF_FORMAT_STRING:
 461                         item->data_len = sizeof(char) * elements;
 462                         break;
 463                 case EXIF_FORMAT_SHORT_UNSIGNED:
 464                         item->data_len = sizeof(guint16) * elements;
 465                         break;
 466                 case EXIF_FORMAT_LONG_UNSIGNED:
 467                         item->data_len = sizeof(guint32) * elements;
 468                         break;
 469                 case EXIF_FORMAT_RATIONAL_UNSIGNED:
 470                         item->data_len = sizeof(ExifRational) * elements;
 471                         break;
 472                 case EXIF_FORMAT_BYTE:
 473                         item->data_len = sizeof(char) * elements;
 474                         break;
 475                 case EXIF_FORMAT_UNDEFINED:
 476                         item->data_len = sizeof(char) * elements;
 477                         break;
 478                 case EXIF_FORMAT_SHORT:
 479                         item->data_len = sizeof(gint16) * elements;
 480                         break;
 481                 case EXIF_FORMAT_LONG:
 482                         item->data_len = sizeof(gint32) * elements;
 483                         break;
 484                 case EXIF_FORMAT_RATIONAL:
 485                         item->data_len = sizeof(ExifRational) * elements;
 486                         break;
 487                 case EXIF_FORMAT_FLOAT:
 488                         item->data_len = sizeof(float) * elements;
 489                         break;
 490                 case EXIF_FORMAT_DOUBLE:
 491                         item->data_len = sizeof(double) * elements;
 492                         break;
 493                 }
 494
 495         item->data = g_malloc0(item->data_len);
 496
 497         return item;
 498 }
 499
 500 static void exif_item_free(ExifItem *item)
 501 {
 502         if (!item) return;
 503
 504         g_free(item->data);
 505         g_free(item);
 506 }
 507
 508 const char *exif_item_get_tag_name(ExifItem *item)
 509 {
 510         if (!item || !item->marker) return NULL;
 511         return item->marker->key;
 512 }
 513
 514 const char *exif_item_get_description(ExifItem *item)
 515 {
 516         if (!item || !item->marker) return NULL;
 517         return _(item->marker->description);
 518 }
 519
 520 const char *exif_item_get_format_name(ExifItem *item, gint brief)
 521 {
 522         if (!item || !item->marker) return NULL;
 523         return (brief) ? ExifFormatList[item->format].short_name : ExifFormatList[item->format].description;
 524 }
 525
 526 static GString *string_append_raw_bytes(GString *string, gpointer data, gint ne)
 527 {
 528         gint i;
 529
 530         for (i = 0 ; i < ne; i++)
 531                 {
 532                 unsigned char c = ((char *)data)[i];
 533                 if (c < 32 || c > 127) c = '.';
 534                 g_string_append_printf(string, "%c", c);
 535                 }
 536         string = g_string_append(string, " : ");
 537         for (i = 0 ; i < ne; i++)
 538                 {
 539                 const gchar *spacer;
 540                 if (i > 0)
 541                         {
 542                         if (i%8 == 0)
 543                                 {
 544                                 spacer = " - ";
 545                                 }
 546                         else
 547                                 {
 548                                 spacer = " ";
 549                                 }
 550                         }
 551                 else
 552                         {
 553                         spacer = "";
 554                         }
 555                 g_string_append_printf(string, "%s%02x", spacer, ((char *)data)[i]);
 556                 }
 557
 558         return string;
 559 }
 560
 561 gchar *exif_text_list_find_value(ExifTextList *list, guint value)
 562 {
 563         gchar *result = NULL;
 564         gint i;
 565
 566         i = 0;
 567         while (!result && list[i].value >= 0)
 568                 {
 569                 if (value == list[i].value) result = g_strdup(_(list[i].description));
 570                 i++;
 571                 }
 572         if (!result) result = g_strdup_printf("%d (%s)", value, _("unknown"));
 573
 574         return result;
 575 }
 576
 577 /*
 578  *-------------------------------------------------------------------
 579  * byte order utils
 580  *-------------------------------------------------------------------
 581  */
 582
 583 /* note: the align_buf is used to avoid alignment issues (on sparc) */
 584
 585 guint16 exif_byte_get_int16(unsigned char *f, ExifByteOrder bo)
 586 {
 587         guint16 align_buf;
 588
 589         memcpy(&align_buf, f, sizeof(guint16));
 590
 591         if (bo == EXIF_BYTE_ORDER_INTEL)
 592                 return GUINT16_FROM_LE(align_buf);
 593         else
 594                 return GUINT16_FROM_BE(align_buf);
 595 }
 596
 597 guint32 exif_byte_get_int32(unsigned char *f, ExifByteOrder bo)
 598 {
 599         guint32 align_buf;
 600
 601         memcpy(&align_buf, f, sizeof(guint32));
 602
 603         if (bo == EXIF_BYTE_ORDER_INTEL)
 604                 return GUINT32_FROM_LE(align_buf);
 605         else
 606                 return GUINT32_FROM_BE(align_buf);
 607 }
 608
 609 void exif_byte_put_int16(unsigned char *f, guint16 n, ExifByteOrder bo)
 610 {
 611         guint16 align_buf;
 612
 613         if (bo == EXIF_BYTE_ORDER_INTEL)
 614                 {
 615                 align_buf = GUINT16_TO_LE(n);
 616                 }
 617         else
 618                 {
 619                 align_buf = GUINT16_TO_BE(n);
 620                 }
 621
 622         memcpy(f, &align_buf, sizeof(guint16));
 623 }
 624
 625 void exif_byte_put_int32(unsigned char *f, guint32 n, ExifByteOrder bo)
 626 {
 627         guint32 align_buf;
 628
 629         if (bo == EXIF_BYTE_ORDER_INTEL)
 630                 {
 631                 align_buf = GUINT32_TO_LE(n);
 632                 }
 633         else
 634                 {
 635                 align_buf = GUINT32_TO_BE(n);
 636                 }
 637
 638         memcpy(f, &align_buf, sizeof(guint32));
 639 }
 640
 641
 642 /*
 643  *-------------------------------------------------------------------
 644  * IFD utils
 645  *-------------------------------------------------------------------
 646  */
 647
 648 static const ExifMarker *exif_marker_from_tag(guint16 tag, const ExifMarker *list)
 649 {
 650         gint i = 0;
 651
 652         if (!list) return NULL;
 653
 654         while (list[i].tag != 0 && list[i].tag != tag)
 655                 {
 656                 i++;
 657                 }
 658
 659         return (list[i].tag == 0 ? NULL : &list[i]);
 660 }
 661
 662 static void rational_from_data(ExifRational *r, void *src, ExifByteOrder bo)
 663 {
 664         r->num = exif_byte_get_int32(src, bo);
 665         r->den = exif_byte_get_int32(src + sizeof(guint32), bo);
 666 }
 667
 668 /* src_format and item->format must be compatible
 669  * and not overrun src or item->data.
 670  */
 671 void exif_item_copy_data(ExifItem *item, void *src, guint len,
 672                          ExifFormatType src_format, ExifByteOrder bo)
 673 {
 674         gint bs;
 675         gint ne;
 676         gpointer dest;
 677         gint i;
 678
 679         bs = ExifFormatList[item->format].size;
 680         ne = item->elements;
 681         dest = item->data;
 682
 683         if (!dest ||
 684             ExifFormatList[src_format].size * ne > len)
 685                 {
 686                 printf("exif tag %s data size mismatch\n", exif_item_get_tag_name(item));
 687                 return;
 688                 }
 689
 690         switch (item->format)
 691                 {
 692                 case EXIF_FORMAT_UNKNOWN:
 693                         break;
 694                 case EXIF_FORMAT_BYTE_UNSIGNED:
 695                 case EXIF_FORMAT_BYTE:
 696                 case EXIF_FORMAT_UNDEFINED:
 697                         memcpy(dest, src, len);
 698                         break;
 699                 case EXIF_FORMAT_STRING:
 700                         memcpy(dest, src, len);
 701                         /* string is NULL terminated, make sure this is true */
 702                         if (((char *)dest)[len - 1] != '\0') ((char *)dest)[len - 1] = '\0';
 703                         break;
 704                 case EXIF_FORMAT_SHORT_UNSIGNED:
 705                 case EXIF_FORMAT_SHORT:
 706                         for (i = 0; i < ne; i++)
 707                                 {
 708                                 ((guint16 *)dest)[i] = exif_byte_get_int16(src + i * bs, bo);
 709                                 }
 710                         break;
 711                 case EXIF_FORMAT_LONG_UNSIGNED:
 712                 case EXIF_FORMAT_LONG:
 713                         if (src_format == EXIF_FORMAT_SHORT_UNSIGNED ||
 714                             src_format == EXIF_FORMAT_SHORT)
 715                                 {
 716                                 /* a short fits into a long, so allow it */
 717                                 gint ss;
 718
 719                                 ss = ExifFormatList[src_format].size;
 720                                 for (i = 0; i < ne; i++)
 721                                         {
 722                                         ((gint32 *)dest)[i] =
 723                                                 (gint32)exif_byte_get_int16(src + i * ss, bo);
 724                                         }
 725                                 }
 726                         else
 727                                 {
 728                                 for (i = 0; i < ne; i++)
 729                                         {
 730                                         ((gint32 *)dest)[i] =
 731                                                 exif_byte_get_int32(src + i * bs, bo);
 732                                         }
 733                                 }
 734                         break;
 735                 case EXIF_FORMAT_RATIONAL_UNSIGNED:
 736                 case EXIF_FORMAT_RATIONAL:
 737                         for (i = 0; i < ne; i++)
 738                                 {
 739                                 rational_from_data(&((ExifRational *)dest)[i], src + i * bs, bo);
 740                                 }
 741                         break;
 742                 case EXIF_FORMAT_FLOAT:
 743                         for (i = 0; i < ne; i++)
 744                                 {
 745                                 ((float *)dest)[i] = exif_byte_get_int32(src + i * bs, bo);
 746                                 }
 747                         break;
 748                 case EXIF_FORMAT_DOUBLE:
 749                         for (i = 0; i < ne; i++)
 750                                 {
 751                                 ExifRational r;
 752
 753                                 rational_from_data(&r, src + i * bs, bo);
 754                                 if (r.den) ((double *)dest)[i] = (double)r.num / r.den;
 755                                 }
 756                         break;
 757                 }
 758 }
 759
 760 static gint exif_parse_IFD_entry(ExifData *exif, unsigned char *tiff, guint offset,
 761                                  guint size, ExifByteOrder bo,
 762                                  gint level,
 763                                  const ExifMarker *list)
 764 {
 765         guint tag;
 766         guint format;
 767         guint count;
 768         guint data_val;
 769         guint data_offset;
 770         guint data_length;
 771         const ExifMarker *marker;
 772         ExifItem *item;
 773
 774         tag = exif_byte_get_int16(tiff + offset + EXIF_TIFD_OFFSET_TAG, bo);
 775         format = exif_byte_get_int16(tiff + offset + EXIF_TIFD_OFFSET_FORMAT, bo);
 776         count = exif_byte_get_int32(tiff + offset + EXIF_TIFD_OFFSET_COUNT, bo);
 777         data_val = exif_byte_get_int32(tiff + offset + EXIF_TIFD_OFFSET_DATA, bo);
 778
 779         /* Check tag type. If it does not match, either the format is wrong,
 780          * either it is a unknown tag; so it is not really an error.
 781          */
 782         marker = exif_marker_from_tag(tag, list);
 783         if (!marker)
 784                 {
 785                 if (format >= EXIF_FORMAT_COUNT)
 786                         {
 787                         printf("warning: exif tag 0x%4x has invalid format %d\n", tag, format);
 788                         return 0;
 789                         }
 790                 /* allow non recognized tags to be displayed */
 791                 marker = &ExifUnknownMarkersList[format];
 792                 }
 793         if (marker->format != format)
 794                 {
 795                 /* Some cameras got mixed up signed/unsigned_rational
 796                  * eg KODAK DC4800 on object_distance tag
 797                  *
 798                  * FIXME: what exactly is this test trying to do?
 799                  * ok, so this test is to allow the case of swapped signed/unsigned mismatch to leak through?
 800                  */
 801                 if (!(marker->format == EXIF_FORMAT_RATIONAL_UNSIGNED && format == EXIF_FORMAT_RATIONAL) &&
 802                     !(marker->format == EXIF_FORMAT_RATIONAL && format == EXIF_FORMAT_RATIONAL_UNSIGNED) &&
 803                         /* short fits into a long so allow this mismatch
 804                          * as well (some tags allowed to be unsigned short _or_ unsigned long)
 805                          */
 806                     !(marker->format == EXIF_FORMAT_LONG_UNSIGNED && format == EXIF_FORMAT_SHORT_UNSIGNED) )
 807                         {
 808                         if (format < EXIF_FORMAT_COUNT)
 809                                 {
 810                                 printf("warning: exif tag %s format mismatch, found %s exif spec requests %s\n",
 811                                         marker->key, ExifFormatList[format].short_name,
 812                                         ExifFormatList[marker->format].short_name);
 813                                 }
 814                         else
 815                                 {
 816                                 printf("warning: exif tag %s format mismatch, found unknown id %d exif spec requests %d (%s)\n",
 817                                         marker->key, format, marker->format,
 818                                         ExifFormatList[marker->format].short_name);
 819                                 }
 820                         return 0;
 821                         }
 822                 }
 823
 824         /* Where is the data, is it available?
 825          */
 826         if (marker->components > 0 && marker->components != count)
 827                 {
 828                 printf("warning: exif tag %s has %d elements, exif spec requests %d\n",
 829                         marker->key, count, marker->components);
 830                 }
 831
 832         data_length = ExifFormatList[marker->format].size * count;
 833         if (data_length > 4)
 834                 {
 835                 data_offset = data_val;
 836                 if (size < data_offset + data_length)
 837                         {
 838                         printf("warning: exif tag %s data will overrun end of file, ignored.\n", marker->key);
 839                         return -1;
 840                         }
 841                 }
 842         else
 843                 {
 844                 data_offset = offset + EXIF_TIFD_OFFSET_DATA;
 845                 }
 846
 847         item = exif_item_new(marker->format, tag, count, marker);
 848         exif_item_copy_data(item, tiff + data_offset, data_length, format, bo);
 849         exif->items = g_list_prepend(exif->items, item);
 850
 851         if (list == ExifKnownMarkersList)
 852                 {
 853                 switch (item->tag)
 854                         {
 855                         case TAG_EXIFOFFSET:
 856                                 exif_parse_IFD_table(exif, tiff, data_val, size, bo, level + 1, list);
 857                                 break;
 858                         case TAG_EXIFMAKERNOTE:
 859                                 format_exif_makernote_parse(exif, tiff, data_val, size, bo);
 860                                 break;
 861                         }
 862                 }
 863
 864         return 0;
 865 }
 866
 867 gint exif_parse_IFD_table(ExifData *exif,
 868                           unsigned char *tiff, guint offset,
 869                           guint size, ExifByteOrder bo,
 870                           gint level,
 871                           const ExifMarker *list)
 872 {
 873         guint count;
 874         guint i;
 875
 876         /* limit damage from infinite loops */
 877         if (level > EXIF_TIFF_MAX_LEVELS) return -1;
 878
 879         /* We should be able to read number of entries in IFD0) */
 880         if (size < offset + 2) return -1;
 881
 882         count = exif_byte_get_int16(tiff + offset, bo);
 883         offset += 2;
 884
 885         /* Entries and next IFD offset must be readable */
 886         if (size < offset + count * EXIF_TIFD_SIZE + 4) return -1;
 887
 888         for (i = 0; i < count; i++)
 889                 {
 890                 exif_parse_IFD_entry(exif, tiff, offset + i * EXIF_TIFD_SIZE, size, bo, level, list);
 891                 }
 892
 893         return 0;
 894 }
 895
 896 /*
 897  *-------------------------------------------------------------------
 898  * file formats
 899  *-------------------------------------------------------------------
 900  */
 901
 902 gint exif_tiff_directory_offset(unsigned char *data, const guint len,
 903                                 guint *offset, ExifByteOrder *bo)
 904 {
 905         if (len < 8) return FALSE;
 906
 907         if (memcmp(data, "II", 2) == 0)
 908                 {
 909                 *bo = EXIF_BYTE_ORDER_INTEL;
 910                 }
 911         else if (memcmp(data, "MM", 2) == 0)
 912                 {
 913                 *bo = EXIF_BYTE_ORDER_MOTOROLA;
 914                 }
 915         else
 916                 {
 917                 return FALSE;
 918                 }
 919
 920         if (exif_byte_get_int16(data + 2, *bo) != 0x002A)
 921                 {
 922                 return FALSE;
 923                 }
 924
 925         *offset = exif_byte_get_int32(data + 4, *bo);
 926
 927         return (*offset < len);
 928 }
 929
 930 gint exif_tiff_parse(ExifData *exif, unsigned char *tiff, guint size, ExifMarker *list)
 931 {
 932         ExifByteOrder bo;
 933         guint offset;
 934
 935         if (!exif_tiff_directory_offset(tiff, size, &offset, &bo)) return -1;
 936
 937         return exif_parse_IFD_table(exif, tiff, offset, size, bo, 0, list);
 938 }
 939
 940 /*
 941  *-------------------------------------------------------------------
 942  * jpeg marker utils
 943  *-------------------------------------------------------------------
 944  */
 945
 946 #define JPEG_MARKER             0xFF
 947 #define JPEG_MARKER_SOI         0xD8
 948 #define JPEG_MARKER_EOI         0xD9
 949 #define JPEG_MARKER_APP1        0xE1
 950 #define JPEG_MARKER_APP2        0xE2
 951
 952 /* jpeg container format:
 953      all data markers start with 0XFF
 954      2 byte long file start and end markers: 0xFFD8(SOI) and 0XFFD9(EOI)
 955      4 byte long data segment markers in format: 0xFFTTSSSSNNN...
 956        FF:   1 byte standard marker identifier
 957        TT:   1 byte data type
 958        SSSS: 2 bytes in Motorola byte alignment for length of the data.
 959              This value includes these 2 bytes in the count, making actual
 960              length of NN... == SSSS - 2.
 961        NNN.: the data in this segment
 962  */
 963
 964 static gint exif_jpeg_segment_find(unsigned char *data, guint size,
 965                                    guchar app_marker, const gchar *magic, guint magic_len,
 966                                    guint *seg_offset, guint *seg_length)
 967 {
 968         guchar marker = 0;
 969         guint offset = 0;
 970         guint length = 0;
 971
 972         while (marker != app_marker &&
 973                marker != JPEG_MARKER_EOI)
 974                 {
 975                 offset += length;
 976                 length = 2;
 977
 978                 if (offset + 2 >= size ||
 979                     data[offset] != JPEG_MARKER) return FALSE;
 980
 981                 marker = data[offset + 1];
 982                 if (marker != JPEG_MARKER_SOI &&
 983                     marker != JPEG_MARKER_EOI)
 984                         {
 985                         if (offset + 4 >= size) return FALSE;
 986                         length += exif_byte_get_int16(data + offset + 2, EXIF_BYTE_ORDER_MOTOROLA);
 987                         }
 988                 }
 989
 990         if (marker == app_marker &&
 991             offset + length < size &&
 992             length >= 4 + magic_len &&
 993             memcmp(data + offset + 4, magic, magic_len) == 0)
 994                 {
 995                 *seg_offset = offset + 4;
 996                 *seg_length = length - 4;
 997                 return TRUE;
 998                 }
 999
1000         return FALSE;
1001 }
1002
1003 static ExifMarker jpeg_color_marker = { 0x8773, EXIF_FORMAT_UNDEFINED, -1, "ColorProfile", NULL, NULL };
1004
1005 static gint exif_jpeg_parse_color(ExifData *exif, unsigned char *data, guint size)
1006 {
1007         guint seg_offset = 0;
1008         guint seg_length = 0;
1009         guint chunk_offset[255];
1010         guint chunk_length[255];
1011         guint chunk_count = 0;
1012
1013         /* For jpeg/jfif, ICC color profile data can be in more than one segment.
1014            the data is in APP2 data segments that start with "ICC_PROFILE\x00\xNN\xTT"
1015            NN = segment number for data
1016            TT = total number of ICC segments (TT in each ICC segment should match)
1017          */
1018
1019         while (exif_jpeg_segment_find(data + seg_offset + seg_length,
1020                                       size - seg_offset - seg_length,
1021                                       JPEG_MARKER_APP2,
1022                                       "ICC_PROFILE\x00", 12,
1023                                       &seg_offset, &seg_length))
1024                 {
1025                 guchar chunk_num;
1026                 guchar chunk_tot;
1027
1028                 if (seg_length < 14) return FALSE;
1029
1030                 chunk_num = data[seg_offset + 12];
1031                 chunk_tot = data[seg_offset + 13];
1032
1033                 if (chunk_num == 0 || chunk_tot == 0) return FALSE;
1034
1035                 if (chunk_count == 0)
1036                         {
1037                         guint i;
1038
1039                         chunk_count = (guint)chunk_tot;
1040                         for (i = 0; i < chunk_count; i++) chunk_offset[i] = 0;
1041                         for (i = 0; i < chunk_count; i++) chunk_length[i] = 0;
1042                         }
1043
1044                 if (chunk_tot != chunk_count ||
1045                     chunk_num > chunk_count) return FALSE;
1046
1047                 chunk_num--;
1048                 chunk_offset[chunk_num] = seg_offset + 14;
1049                 chunk_length[chunk_num] = seg_length - 14;
1050                 }
1051
1052         if (chunk_count > 0)
1053                 {
1054                 ExifItem *item;
1055                 unsigned char *cp_data;
1056                 guint cp_length = 0;
1057                 guint i;
1058
1059                 for (i = 0; i < chunk_count; i++) cp_length += chunk_length[i];
1060                 cp_data = g_malloc(cp_length);
1061
1062                 for (i = 0; i < chunk_count; i++)
1063                         {
1064                         if (chunk_offset[i] == 0)
1065                                 {
1066                                 /* error, we never saw this chunk */
1067                                 g_free(cp_data);
1068                                 return FALSE;
1069                                 }
1070                         memcpy(cp_data, data + chunk_offset[i], chunk_length[i]);
1071                         }
1072
1073                 item = exif_item_new(jpeg_color_marker.format, jpeg_color_marker.tag, 1,
1074                                      &jpeg_color_marker);
1075                 g_free(item->data);
1076                 item->data = cp_data;
1077                 item->elements = cp_length;
1078                 item->data_len = cp_length;
1079                 exif->items = g_list_prepend(exif->items, item);
1080
1081                 return TRUE;
1082                 }
1083
1084         return FALSE;
1085 }
1086
1087 static gint exif_jpeg_parse(ExifData *exif,
1088                             unsigned char *data, guint size,
1089                             ExifMarker *list, gint parse_color)
1090 {
1091         guint seg_offset = 0;
1092         guint seg_length = 0;
1093         gint res = -1;
1094
1095         if (size < 4 ||
1096             memcmp(data, "\xFF\xD8", 2) != 0)
1097                 {
1098                 return -2;
1099                 }
1100
1101         if (exif_jpeg_segment_find(data, size, JPEG_MARKER_APP1,
1102                                    "Exif\x00\x00", 6,
1103                                    &seg_offset, &seg_length))
1104                 {
1105                 res = exif_tiff_parse(exif, data + seg_offset + 6, seg_length - 6, list);
1106                 }
1107
1108         if (parse_color &&
1109             exif_jpeg_parse_color(exif, data, size))
1110                 {
1111                 res = 0;
1112                 }
1113
1114         return res;
1115 }
1116
1117
1118 /*
1119  *-------------------------------------------------------------------
1120  * misc
1121  *-------------------------------------------------------------------
1122  */
1123
1124 static gint map_file(const gchar *path, void **mapping, int *size)
1125 {
1126         int fd;
1127         struct stat fs;
1128
1129         if ((fd = open(path, O_RDONLY)) == -1)
1130                 {
1131                 perror(path);
1132                 return -1;
1133                 }
1134
1135         if (fstat(fd, &fs) == -1)
1136                 {
1137                 perror(path);
1138                 close(fd);
1139                 return -1;
1140                 }
1141
1142         *size = fs.st_size;
1143
1144         if ((*mapping = mmap(0, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0)) == MAP_FAILED)
1145                 {
1146                 perror(path);
1147                 close(fd);
1148                 return -1;
1149                 }
1150
1151         close(fd);
1152         return 0;
1153 }
1154
1155 static gint unmap_file(void *mapping, int size)
1156 {
1157         if (munmap(mapping, size) == -1)
1158                 {
1159                 perror("munmap");
1160                 return -1;
1161                 }
1162
1163         return 0;
1164 }
1165
1166 void exif_free(ExifData *exif)
1167 {
1168         GList *work;
1169
1170         if (!exif) return;
1171
1172         work = exif->items;
1173         while (work)
1174                 {
1175                 ExifItem *item = work->data;
1176                 work = work->next;
1177                 exif_item_free(item);
1178                 }
1179
1180         g_list_free(exif->items);
1181         g_free(exif);
1182 }
1183
1184 ExifData *exif_read(const gchar *path, gint parse_color_profile)
1185 {
1186         ExifData *exif;
1187         void *f;
1188         int size, res;
1189         gchar *pathl;
1190
1191         if (!path) return NULL;
1192
1193         pathl = path_from_utf8(path);
1194         if (map_file(pathl, &f, &size) == -1)
1195                 {
1196                 g_free(pathl);
1197                 return NULL;
1198                 }
1199         g_free(pathl);
1200
1201         exif = g_new0(ExifData, 1);
1202         exif->items = NULL;
1203
1204         if ((res = exif_jpeg_parse(exif, (unsigned char *)f, size,
1205                                    ExifKnownMarkersList,
1206                                    parse_color_profile)) == -2)
1207                 {
1208                 res = exif_tiff_parse(exif, (unsigned char *)f, size, ExifKnownMarkersList);
1209                 }
1210
1211         if (res != 0)
1212                 {
1213                 FormatRawExifType exif_type;
1214                 FormatRawExifParseFunc exif_parse_func;
1215                 guint32 offset = 0;
1216
1217                 exif_type = format_raw_exif_offset(f, size, &offset, &exif_parse_func);
1218                 switch (exif_type)
1219                         {
1220                         case FORMAT_RAW_EXIF_NONE:
1221                         default:
1222                                 break;
1223                         case FORMAT_RAW_EXIF_TIFF:
1224                                 res = exif_tiff_parse(exif, (unsigned char*)f + offset, size - offset,
1225                                                       ExifKnownMarkersList);
1226                                 break;
1227                         case FORMAT_RAW_EXIF_JPEG:
1228                                 res = exif_jpeg_parse(exif, (unsigned char*)f + offset, size - offset,
1229                                                       ExifKnownMarkersList, FALSE);
1230                                 break;
1231                         case FORMAT_RAW_EXIF_IFD_II:
1232                         case FORMAT_RAW_EXIF_IFD_MM:
1233                                 res = exif_parse_IFD_table(exif, (unsigned char*)f, offset, size - offset,
1234                                                            (exif_type == FORMAT_RAW_EXIF_IFD_II) ?
1235                                                                 EXIF_BYTE_ORDER_INTEL : EXIF_BYTE_ORDER_MOTOROLA,
1236                                                            0, ExifKnownMarkersList);
1237                                 break;
1238                         case FORMAT_RAW_EXIF_PROPRIETARY:
1239                                 if (exif_parse_func)
1240                                         {
1241                                         res = exif_parse_func((unsigned char*)f + offset, size - offset, exif);
1242                                         }
1243                                 break;
1244                         }
1245                 }
1246
1247         if (res != 0)
1248                 {
1249                 exif_free(exif);
1250                 exif = NULL;
1251                 }
1252
1253         unmap_file(f, size);
1254
1255         if (exif) exif->items = g_list_reverse(exif->items);
1256
1257 #if 0
1258         exif_write_data_list(exif, stdout, TRUE);
1259         exif_write_data_list(exif, stdout, FALSE);
1260 #endif
1261
1262         return exif;
1263 }
1264
1265 ExifItem *exif_get_item(ExifData *exif, const gchar *key)
1266 {
1267         GList *work;
1268
1269         if (!key) return NULL;
1270
1271         work = exif->items;
1272         while (work)
1273                 {
1274                 ExifItem *item;
1275
1276                 item = work->data;
1277                 work = work->next;
1278                 if (item->marker->key && strcmp(key, item->marker->key) == 0) return item;
1279                 }
1280         return NULL;
1281 }
1282
1283 #define EXIF_DATA_AS_TEXT_MAX_COUNT 16
1284
1285 gchar *exif_item_get_data_as_text(ExifItem *item)
1286 {
1287         const ExifMarker *marker;
1288         gpointer data;
1289         GString *string;
1290         gchar *text;
1291         gint ne;
1292         gint i;
1293
1294         if (!item) return NULL;
1295
1296         marker = item->marker;
1297         if (!marker) return NULL;
1298
1299         data = item->data;
1300         ne = item->elements;
1301         if (ne > EXIF_DATA_AS_TEXT_MAX_COUNT) ne = EXIF_DATA_AS_TEXT_MAX_COUNT;
1302         string = g_string_new("");
1303         switch (item->format)
1304                 {
1305                 case EXIF_FORMAT_UNKNOWN:
1306                         break;
1307                 case EXIF_FORMAT_BYTE_UNSIGNED:
1308                 case EXIF_FORMAT_BYTE:
1309                 case EXIF_FORMAT_UNDEFINED:
1310                         if (ne == 1 && marker->list)
1311                                 {
1312                                 gchar *result;
1313                                 unsigned char val;
1314
1315                                 if (item->format == EXIF_FORMAT_BYTE_UNSIGNED ||
1316                                     item->format == EXIF_FORMAT_UNDEFINED)
1317                                         {
1318                                         val = ((unsigned char *)data)[0];
1319                                         }
1320                                 else
1321                                         {
1322                                         val = (unsigned char)(((signed char *)data)[0]);
1323                                         }
1324
1325                                 result = exif_text_list_find_value(marker->list, (guint)val);
1326                                 string = g_string_append(string, result);
1327                                 g_free(result);
1328                                 }
1329                         else
1330                                 {
1331                                 string = string_append_raw_bytes(string, data, ne);
1332                                 }
1333                         break;
1334                 case EXIF_FORMAT_STRING:
1335                         string = g_string_append(string, (gchar *)(item->data));
1336                         break;
1337                 case EXIF_FORMAT_SHORT_UNSIGNED:
1338                         if (ne == 1 && marker->list)
1339                                 {
1340                                 gchar *result;
1341
1342                                 result = exif_text_list_find_value(marker->list, ((guint16 *)data)[0]);
1343                                 string = g_string_append(string, result);
1344                                 g_free(result);
1345                                 }
1346                         else for (i = 0; i < ne; i++)
1347                                 {
1348                                 g_string_append_printf(string, "%s%hd", (i > 0) ? ", " : "",
1349                                                         ((guint16 *)data)[i]);
1350                                 }
1351                         break;
1352                 case EXIF_FORMAT_LONG_UNSIGNED:
1353                         for (i = 0; i < ne; i++)
1354                                 {
1355                                 g_string_append_printf(string, "%s%ld", (i > 0) ? ", " : "",
1356                                                         (unsigned long int)((guint32 *)data)[i]);
1357                                 }
1358                         break;
1359                 case EXIF_FORMAT_RATIONAL_UNSIGNED:
1360                         for (i = 0; i < ne; i++)
1361                                 {
1362                                 ExifRational *r;
1363
1364                                 r = &((ExifRational *)data)[i];
1365                                 g_string_append_printf(string, "%s%ld/%ld", (i > 0) ? ", " : "",
1366                                                         (unsigned long)r->num, (unsigned long)r->den);
1367                                 }
1368                         break;
1369                 case EXIF_FORMAT_SHORT:
1370                         for (i = 0; i < ne; i++)
1371                                 {
1372                                 g_string_append_printf(string, "%s%hd", (i > 0) ? ", " : "",
1373                                                         ((gint16 *)data)[i]);
1374                                 }
1375                         break;
1376                 case EXIF_FORMAT_LONG:
1377                         for (i = 0; i < ne; i++)
1378                                 {
1379                                 g_string_append_printf(string, "%s%ld", (i > 0) ? ", " : "",
1380                                                         (long int)((gint32 *)data)[i]);
1381                                 }
1382                         break;
1383                 case EXIF_FORMAT_RATIONAL:
1384                         for (i = 0; i < ne; i++)
1385                                 {
1386                                 ExifRational *r;
1387
1388                                 r = &((ExifRational *)data)[i];
1389                                 g_string_append_printf(string, "%s%ld/%ld", (i > 0) ? ", " : "",
1390                                                         (long)r->num, (long)r->den);
1391                                 }
1392                         break;
1393                 case EXIF_FORMAT_FLOAT:
1394                         for (i = 0; i < ne; i++)
1395                                 {
1396                                 g_string_append_printf(string, "%s%f", (i > 0) ? ", " : "",
1397                                                         ((float *)data)[i]);
1398                                 }
1399                         break;
1400                 case EXIF_FORMAT_DOUBLE:
1401                         for (i = 0; i < ne; i++)
1402                                 {
1403                                 g_string_append_printf(string, "%s%f", (i > 0) ? ", " : "",
1404                                                         ((double *)data)[i]);
1405                                 }
1406                         break;
1407                 }
1408
1409         if (item->elements > EXIF_DATA_AS_TEXT_MAX_COUNT &&
1410             item->format != EXIF_FORMAT_STRING)
1411                 {
1412                 g_string_append(string, " ...");
1413                 }
1414
1415         text = string->str;
1416         g_string_free(string, FALSE);
1417
1418         return text;
1419 }
1420
1421 gint exif_item_get_integer(ExifItem *item, gint *value)
1422 {
1423         if (!item) return FALSE;
1424
1425         switch (item->format)
1426                 {
1427                 case EXIF_FORMAT_SHORT:
1428                         *value = (gint)(((gint16 *)(item->data))[0]);
1429                         return TRUE;
1430                         break;
1431                 case EXIF_FORMAT_SHORT_UNSIGNED:
1432                         *value = (gint)(((guint16 *)(item->data))[0]);
1433                         return TRUE;
1434                         break;
1435                 case EXIF_FORMAT_LONG:
1436                         *value = (gint)(((gint32 *)(item->data))[0]);
1437                         return TRUE;
1438                         break;
1439                 case EXIF_FORMAT_LONG_UNSIGNED:
1440                         /* FIXME: overflow possible */
1441                         *value = (gint)(((guint32 *)(item->data))[0]);
1442                         return TRUE;
1443                 default:
1444                         /* all other type return FALSE */
1445                         break;
1446                 }
1447         return FALSE;
1448 }
1449
1450 gint exif_get_integer(ExifData *exif, const gchar *key, gint *value)
1451 {
1452         ExifItem *item;
1453
1454         item = exif_get_item(exif, key);
1455         return exif_item_get_integer(item, value);
1456 }
1457
1458 ExifRational *exif_item_get_rational(ExifItem *item, gint *sign)
1459 {
1460         if (!item) return NULL;
1461
1462         if (item->format == EXIF_FORMAT_RATIONAL ||
1463             item->format == EXIF_FORMAT_RATIONAL_UNSIGNED)
1464                 {
1465                 if (sign) *sign = (item->format == EXIF_FORMAT_RATIONAL);
1466                 return &((ExifRational *)(item->data))[0];
1467                 }
1468
1469         return NULL;
1470 }
1471
1472 ExifRational *exif_get_rational(ExifData *exif, const gchar *key, gint *sign)
1473 {
1474         ExifItem *item;
1475
1476         item = exif_get_item(exif, key);
1477         return exif_item_get_rational(item, sign);
1478 }
1479
1480 double exif_rational_to_double(ExifRational *r, gint sign)
1481 {
1482         if (!r || r->den == 0.0) return 0.0;
1483
1484         if (sign) return (double)((int)r->num) / (double)((int)r->den);
1485         return (double)r->num / r->den;
1486 }
1487
1488 static double exif_get_rational_as_double(ExifData *exif, const gchar *key)
1489 {
1490         ExifRational *r;
1491         gint sign;
1492
1493         r = exif_get_rational(exif, key, &sign);
1494         return exif_rational_to_double(r, sign);
1495 }
1496
1497 static GString *append_comma_text(GString *string, const gchar *text)
1498 {
1499         string = g_string_append(string, ", ");
1500         string = g_string_append(string, text);
1501
1502         return string;
1503 }
1504
1505 static gchar *exif_get_formatted_by_key(ExifData *exif, const gchar *key, gint *key_valid)
1506 {
1507         /* must begin with f, else not formatted */
1508         if (key[0] != 'f')
1509                 {
1510                 if (key_valid) *key_valid = FALSE;
1511                 return NULL;
1512                 }
1513
1514         if (key_valid) *key_valid = TRUE;
1515
1516         if (strcmp(key, "fCamera") == 0)
1517                 {
1518                 gchar *text;
1519                 gchar *make = exif_get_data_as_text(exif, "Make");
1520                 gchar *model = exif_get_data_as_text(exif, "Model");
1521                 gchar *software = exif_get_data_as_text(exif, "Software");
1522
1523                 text = g_strdup_printf("%s%s%s%s%s%s", (make) ? make : "", ((make) && (model)) ? " " : "",
1524                                                        (model) ? model : "",
1525                                                        (software) ? " (" : "",
1526                                                        (software) ? software : "",
1527                                                        (software) ? ")" : "");
1528
1529                 g_free(make);
1530                 g_free(model);
1531                 g_free(software);
1532                 return text;
1533                 }
1534         if (strcmp(key, "fDateTime") == 0)
1535                 {
1536                 gchar *text = exif_get_data_as_text(exif, "DateTimeOriginal");
1537                 gchar *subsec = NULL;
1538                 if (text) subsec = exif_get_data_as_text(exif, "SubsecTimeOriginal");
1539                 if (!text)
1540                         {
1541                         text = exif_get_data_as_text(exif, "DateTime");
1542                         if (text) subsec = exif_get_data_as_text(exif, "SubsecTime");
1543                         }
1544                 if (subsec)
1545                         {
1546                         gchar *tmp = text;
1547                         text = g_strconcat(tmp, ".", subsec, NULL);
1548                         g_free(tmp);
1549                         g_free(subsec);
1550                         }
1551                 return text;
1552                 }
1553         if (strcmp(key, "fShutterSpeed") == 0)
1554                 {
1555                 ExifRational *r;
1556
1557                 r = exif_get_rational(exif, "ExposureTime", NULL);
1558                 if (r && r->num && r->den)
1559                         {
1560                         double n = (double)r->den / (double)r->num;
1561                         return g_strdup_printf("%s%.0fs", n > 1.0 ? "1/" : "",
1562                                                           n > 1.0 ? n : 1.0 / n);
1563                         }
1564                 r = exif_get_rational(exif, "ShutterSpeedValue", NULL);
1565                 if (r && r->num  && r->den)
1566                         {
1567                         double n = pow(2.0, exif_rational_to_double(r, TRUE));
1568
1569                         /* Correct exposure time to avoid values like 1/91s (seen on Minolta DImage 7) */
1570                         if (n > 1.0 && (int)n - ((int)(n/10))*10 == 1) n--;
1571
1572                         return g_strdup_printf("%s%.0fs", n > 1.0 ? "1/" : "",
1573                                                           n > 1.0 ? floor(n) : 1.0 / n);
1574                         }
1575                 return NULL;
1576                 }
1577         if (strcmp(key, "fAperture") == 0)
1578                 {
1579                 double n;
1580
1581                 n = exif_get_rational_as_double(exif, "FNumber");
1582                 if (n == 0.0) n = exif_get_rational_as_double(exif, "ApertureValue");
1583                 if (n == 0.0) return NULL;
1584
1585                 return g_strdup_printf("f/%.1f", n);
1586                 }
1587         if (strcmp(key, "fExposureBias") == 0)
1588                 {
1589                 ExifRational *r;
1590                 gint sign;
1591                 double n;
1592
1593                 r = exif_get_rational(exif, "ExposureBiasValue", &sign);
1594                 if (!r) return NULL;
1595
1596                 n = exif_rational_to_double(r, sign);
1597                 return g_strdup_printf("%+.1f", n);
1598                 }
1599         if (strcmp(key, "fFocalLength") == 0)
1600                 {
1601                 double n;
1602
1603                 n = exif_get_rational_as_double(exif, "FocalLength");
1604                 if (n == 0.0) return NULL;
1605                 return g_strdup_printf("%.2f mm", n);
1606                 }
1607         if (strcmp(key, "fISOSpeedRating") == 0)
1608                 {
1609                 gchar *text;
1610
1611                 text = exif_get_data_as_text(exif, "ISOSpeedRatings");
1612                 /* kodak may set this instead */
1613                 if (!text) text = exif_get_data_as_text(exif, "ExposureIndex");
1614                 return text;
1615                 }
1616         if (strcmp(key, "fSubjectDistance") == 0)
1617                 {
1618                 ExifRational *r;
1619                 gint sign;
1620                 double n;
1621
1622                 r = exif_get_rational(exif, "SubjectDistance", &sign);
1623                 if (!r) return NULL;
1624
1625                 if ((long)r->num == 0xffffffff) return g_strdup(_("infinity"));
1626                 if ((long)r->num == 0) return g_strdup(_("unknown"));
1627
1628                 n = exif_rational_to_double(r, sign);
1629                 if (n == 0.0) return _("unknown");
1630                 return g_strdup_printf("%.3f m", n);
1631                 }
1632         if (strcmp(key, "fFlash") == 0)
1633                 {
1634                 /* grr, flash is a bitmask... */
1635                 GString *string;
1636                 gchar *text;
1637                 gint n;
1638                 gint v;
1639
1640                 if (!exif_get_integer(exif, "Flash", &n)) return NULL;
1641
1642                 /* Exif 2.1 only defines first 3 bits */
1643                 if (n <= 0x07) return exif_text_list_find_value(ExifFlashList, n);
1644
1645                 /* must be Exif 2.2 */
1646                 string = g_string_new("");
1647
1648                 /* flash fired (bit 0) */
1649                 string = g_string_append(string, (n & 0x01) ? _("yes") : _("no"));
1650
1651                 /* flash mode (bits 3, 4) */
1652                 v = (n >> 3) & 0x03;
1653                 if (v) string = append_comma_text(string, _("mode:"));
1654                 switch (v)
1655                         {
1656                         case 1:
1657                                 string = g_string_append(string, _("on"));
1658                                 break;
1659                         case 2:
1660                                 string = g_string_append(string, _("off"));
1661                                 break;
1662                         case 3:
1663                                 string = g_string_append(string, _("auto"));
1664                                 break;
1665                         }
1666
1667                 /* return light (bits 1, 2) */
1668                 v = (n >> 1) & 0x03;
1669                 if (v == 2) string = append_comma_text(string, _("not detected by strobe"));
1670                 if (v == 3) string = append_comma_text(string, _("detected by strobe"));
1671
1672                 /* we ignore flash function (bit 5) */
1673
1674                 /* red-eye (bit 6) */
1675                 if ((n >> 5) & 0x01) string = append_comma_text(string, _("red-eye reduction"));
1676
1677                 text = string->str;
1678                 g_string_free(string, FALSE);
1679                 return text;
1680                 }
1681         if (strcmp(key, "fResolution") == 0)
1682                 {
1683                 ExifRational *rx, *ry;
1684                 gchar *units;
1685                 gchar *text;
1686
1687                 rx = exif_get_rational(exif, "XResolution", NULL);
1688                 ry = exif_get_rational(exif, "YResolution", NULL);
1689                 if (!rx || !ry) return NULL;
1690
1691                 units = exif_get_data_as_text(exif, "ResolutionUnit");
1692                 text = g_strdup_printf("%0.f x %0.f (%s/%s)", rx->den ? (double)rx->num / rx->den : 1.0,
1693                                                               ry->den ? (double)ry->num / ry->den : 1.0,
1694                                                               _("dot"), (units) ? units : _("unknown"));
1695
1696                 g_free(units);
1697                 return text;
1698                 }
1699
1700         if (key_valid) *key_valid = FALSE;
1701         return NULL;
1702 }
1703
1704 gchar *exif_get_data_as_text(ExifData *exif, const gchar *key)
1705 {
1706         ExifItem *item;
1707         gchar *text;
1708         gint key_valid;
1709
1710         if (!key) return NULL;
1711
1712         text = exif_get_formatted_by_key(exif, key, &key_valid);
1713         if (key_valid) return text;
1714
1715         item = exif_get_item(exif, key);
1716         if (item) return exif_item_get_data_as_text(item);
1717
1718         return NULL;
1719 }
1720
1721 const gchar *exif_get_description_by_key(const gchar *key)
1722 {
1723         gint i;
1724
1725         if (!key) return NULL;
1726
1727         i = 0;
1728         while (ExifFormattedList[i].key != NULL)
1729                 {
1730                 if (strcmp(key, ExifFormattedList[i].key) == 0) return _(ExifFormattedList[i].description);
1731                 i++;
1732                 }
1733
1734         i = 0;
1735         while (ExifKnownMarkersList[i].tag > 0)
1736                 {
1737                 if (strcmp(key, ExifKnownMarkersList[i].key) == 0) return _(ExifKnownMarkersList[i].description);
1738                 i++;
1739                 }
1740
1741         return NULL;
1742 }
1743
1744 static void exif_write_item(FILE *f, ExifItem *item)
1745 {
1746         gchar *text;
1747
1748         text = exif_item_get_data_as_text(item);
1749         if (text)
1750                 {
1751                 fprintf(f, "%4x %9s %30s %s\n", item->tag, ExifFormatList[item->format].short_name,
1752                         exif_item_get_tag_name(item), text);
1753                 }
1754         g_free(text);
1755 }
1756
1757 void exif_write_data_list(ExifData *exif, FILE *f, gint human_readable_list)
1758 {
1759         if (!f || !exif) return;
1760
1761         fprintf(f, " tag   format                             key value\n");
1762         fprintf(f, "----------------------------------------------------\n");
1763
1764         if (human_readable_list)
1765                 {
1766                 gint i;
1767
1768                 i = 0;
1769                 while (ExifFormattedList[i].key)
1770                         {
1771                         gchar *text;
1772
1773                         text = exif_get_formatted_by_key(exif, ExifFormattedList[i].key, NULL);
1774                         if (text)
1775                                 {
1776                                 fprintf(f, "     %9s %30s %s\n", "string", ExifFormattedList[i].key, text);
1777                                 }
1778                         i++;
1779                         }
1780                 }
1781         else
1782                 {
1783                 GList *work;
1784
1785                 work = exif->items;
1786                 while (work)
1787                         {
1788                         ExifItem *item;
1789
1790                         item = work->data;
1791                         work = work->next;
1792
1793                         exif_write_item(f, item);
1794                         }
1795                 }
1796         fprintf(f, "----------------------------------------------------\n");
1797 }
1798