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 "gqview.h"
  71 #include "exif.h"
  72
  73 #include "format_raw.h"
  74 #include "ui_fileops.h"
  75
  76
  77 /*
  78  *-----------------------------------------------------------------------------
  79  * Tag formats
  80  *-----------------------------------------------------------------------------
  81  */
  82
  83 ExifFormatAttrib ExifFormatList[] = {
  84         { EXIF_FORMAT_UNKNOWN,          1, "unknown",   "unknown" },
  85         { EXIF_FORMAT_BYTE_UNSIGNED,    1, "ubyte",     "unsigned byte" },
  86         { EXIF_FORMAT_STRING,           1, "string",    "string" },
  87         { EXIF_FORMAT_SHORT_UNSIGNED,   2, "ushort",    "unsigned short" },
  88         { EXIF_FORMAT_LONG_UNSIGNED,    4, "ulong",     "unsigned long" },
  89         { EXIF_FORMAT_RATIONAL_UNSIGNED,8, "urational", "unsigned rational" },
  90         { EXIF_FORMAT_BYTE,             1, "byte",      "byte" },
  91         { EXIF_FORMAT_UNDEFINED,        1, "undefined", "undefined" },
  92         { EXIF_FORMAT_SHORT,            2, "sshort",    "signed short" },
  93         { EXIF_FORMAT_LONG,             4, "slong",     "signed long" },
  94         { EXIF_FORMAT_RATIONAL,         8, "srational", "signed rational" },
  95         { EXIF_FORMAT_FLOAT,            4, "float",     "float" },
  96         { EXIF_FORMAT_DOUBLE,           8, "double",    "double" },
  97         { -1, 0, NULL }
  98 };
  99
 100 /* tags that are special, or need special treatment */
 101 #define TAG_EXIFOFFSET          0x8769
 102 #define TAG_EXIFMAKERNOTE       0x927c
 103
 104
 105 /*
 106  *-----------------------------------------------------------------------------
 107  * Data
 108  *-----------------------------------------------------------------------------
 109  */
 110
 111 static ExifTextList ExifOrientationList[] = {
 112         { EXIF_ORIENTATION_UNKNOWN,     N_("unknown") },
 113         { EXIF_ORIENTATION_TOP_LEFT,    N_("top left") },
 114         { EXIF_ORIENTATION_TOP_RIGHT,   N_("top right") },
 115         { EXIF_ORIENTATION_BOTTOM_RIGHT,N_("bottom right") },
 116         { EXIF_ORIENTATION_BOTTOM_LEFT, N_("bottom left") },
 117         { EXIF_ORIENTATION_LEFT_TOP,    N_("left top") },
 118         { EXIF_ORIENTATION_RIGHT_TOP,   N_("right top") },
 119         { EXIF_ORIENTATION_RIGHT_BOTTOM,N_("right bottom") },
 120         { EXIF_ORIENTATION_LEFT_BOTTOM, N_("left bottom") },
 121         EXIF_TEXT_LIST_END
 122 };
 123
 124 static ExifTextList ExifUnitList[] = {
 125         { EXIF_UNIT_UNKNOWN,    N_("unknown") },
 126         { EXIF_UNIT_NOUNIT,     "" },
 127         { EXIF_UNIT_INCH,       N_("inch") },
 128         { EXIF_UNIT_CENTIMETER, N_("centimeter") },
 129         EXIF_TEXT_LIST_END
 130 };
 131
 132 static ExifTextList ExifYCbCrPosList[] = {
 133         { 1,    "center" },
 134         { 2,    "datum" },
 135         EXIF_TEXT_LIST_END
 136 };
 137
 138 static ExifTextList ExifMeteringModeList[] = {
 139         { 0,    N_("unknown") },
 140         { 1,    N_("average") },
 141         { 2,    N_("center weighted") },
 142         { 3,    N_("spot") },
 143         { 4,    N_("multi-spot") },
 144         { 5,    N_("multi-segment") },
 145         { 6,    N_("partial") },
 146         { 255,  N_("other") },
 147         EXIF_TEXT_LIST_END
 148 };
 149
 150 static ExifTextList ExifExposureProgramList[] = {
 151         { 0,    N_("not defined") },
 152         { 1,    N_("manual") },
 153         { 2,    N_("normal") },
 154         { 3,    N_("aperture") },
 155         { 4,    N_("shutter") },
 156         { 5,    N_("creative") },
 157         { 6,    N_("action") },
 158         { 7,    N_("portrait") },
 159         { 8,    N_("landscape") },
 160         EXIF_TEXT_LIST_END
 161 };
 162
 163 static ExifTextList ExifLightSourceList[] = {
 164         { 0,    N_("unknown") },
 165         { 1,    N_("daylight") },
 166         { 2,    N_("fluorescent") },
 167         { 3,    N_("tungsten (incandescent)") },
 168         { 4,    N_("flash") },
 169         { 9,    "fine weather" },
 170         { 10,   "cloudy weather" },
 171         { 11,   "shade" },
 172         { 12,   "daylight fluorescent" },
 173         { 13,   "day white fluorescent" },
 174         { 14,   "cool white fluorescent" },
 175         { 15,   "while fluorescent" },
 176         { 17,   "standard light A" },
 177         { 18,   "standard light B" },
 178         { 19,   "standard light C" },
 179         { 20,   "D55" },
 180         { 21,   "D65" },
 181         { 22,   "D75" },
 182         { 23,   "D50" },
 183         { 24,   "ISO studio tungsten" },
 184         { 255,  N_("other") },
 185         EXIF_TEXT_LIST_END
 186 };
 187
 188 static ExifTextList ExifFlashList[] = {
 189         { 0,    N_("no") },
 190         { 1,    N_("yes") },
 191         { 5,    N_("yes, not detected by strobe") },
 192         { 7,    N_("yes, detected by strobe") },
 193         EXIF_TEXT_LIST_END
 194 };
 195
 196 static ExifTextList ExifColorSpaceList[] = {
 197         { 1,    "sRGB" },
 198         { 65535,"uncalibrated" },
 199         EXIF_TEXT_LIST_END
 200 };
 201
 202 static ExifTextList ExifSensorList[] = {
 203         { 1,    "not defined" },
 204         { 2,    "1 chip color area" },
 205         { 2,    "2 chip color area" },
 206         { 4,    "3 chip color area" },
 207         { 5,    "color sequential area" },
 208         { 7,    "trilinear" },
 209         { 8,    "color sequential linear" },
 210         EXIF_TEXT_LIST_END
 211 };
 212
 213 static ExifTextList ExifSourceList[] = {
 214         { 3,    "digital still camera" },
 215         EXIF_TEXT_LIST_END
 216 };
 217
 218 static ExifTextList ExifSceneList[] = {
 219         { 1,    "direct photo" },
 220         EXIF_TEXT_LIST_END
 221 };
 222
 223 static ExifTextList ExifCustRenderList[] = {
 224         { 0,    "normal" },
 225         { 1,    "custom" },
 226         EXIF_TEXT_LIST_END
 227 };
 228
 229 static ExifTextList ExifExposureModeList[] = {
 230         { 0,    "auto" },
 231         { 1,    "manual" },
 232         { 2,    "auto bracket" },
 233         EXIF_TEXT_LIST_END
 234 };
 235
 236 static ExifTextList ExifWhiteBalanceList[] = {
 237         { 0,    "auto" },
 238         { 1,    "manual" },
 239         EXIF_TEXT_LIST_END
 240 };
 241
 242 static ExifTextList ExifSceneCaptureList[] = {
 243         { 0,    "standard" },
 244         { 1,    "landscape" },
 245         { 2,    "portrait" },
 246         { 3,    "night scene" },
 247         EXIF_TEXT_LIST_END
 248 };
 249
 250 static ExifTextList ExifGainControlList[] = {
 251         { 0,    "none" },
 252         { 1,    "low gain up" },
 253         { 2,    "high gain up" },
 254         { 3,    "low gain down" },
 255         { 4,    "high gain down" },
 256         EXIF_TEXT_LIST_END
 257 };
 258
 259 static ExifTextList ExifContrastList[] = {
 260         { 0,    "normal" },
 261         { 1,    "soft" },
 262         { 2,    "hard" },
 263         EXIF_TEXT_LIST_END
 264 };
 265
 266 static ExifTextList ExifSaturationList[] = {
 267         { 0,    "normal" },
 268         { 1,    "low" },
 269         { 2,    "high" },
 270         EXIF_TEXT_LIST_END
 271 };
 272
 273 static ExifTextList ExifSharpnessList[] = {
 274         { 0,    "normal" },
 275         { 1,    "soft" },
 276         { 2,    "hard" },
 277         EXIF_TEXT_LIST_END
 278 };
 279
 280 static ExifTextList ExifSubjectRangeList[] = {
 281         { 0,    "unknown" },
 282         { 1,    "macro" },
 283         { 2,    "close" },
 284         { 3,    "distant" },
 285         EXIF_TEXT_LIST_END
 286 };
 287
 288 ExifMarker ExifKnownMarkersList[] = {
 289 { 0x010e, EXIF_FORMAT_STRING, -1,               "ImageDescription",     N_("Image description"), NULL },
 290 { 0x010f, EXIF_FORMAT_STRING, -1,               "Make",                 "Camera make", NULL },
 291 { 0x0110, EXIF_FORMAT_STRING, -1,               "Model",                "Camera model", NULL },
 292 { 0x0112, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Orientation",          N_("Orientation"), ExifOrientationList },
 293 { 0x011a, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "XResolution",          "X resolution", NULL },
 294 { 0x011b, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "YResolution",          "Y Resolution", NULL },
 295 { 0x0128, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "ResolutionUnit",       "Resolution units", ExifUnitList },
 296 { 0x0131, EXIF_FORMAT_STRING, -1,               "Software",             "Firmware", NULL },
 297 { 0x0132, EXIF_FORMAT_STRING, 20,               "DateTime",             N_("Date"), NULL },
 298 { 0x013e, EXIF_FORMAT_RATIONAL_UNSIGNED, 2,     "WhitePoint",           "White point", NULL },
 299 { 0x013f, EXIF_FORMAT_RATIONAL_UNSIGNED, 6,     "PrimaryChromaticities","Primary chromaticities", NULL },
 300 { 0x0211, EXIF_FORMAT_RATIONAL_UNSIGNED, 3,     "YCbCrCoefficients",    "YCbCy coefficients", NULL },
 301 { 0x0213, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "YCbCrPositioning",     "YCbCr positioning", ExifYCbCrPosList },
 302 { 0x0214, EXIF_FORMAT_RATIONAL_UNSIGNED, 6,     "ReferenceBlackWhite",  "Black white reference", NULL },
 303 { 0x8298, EXIF_FORMAT_STRING, -1,               "Copyright",            N_("Copyright"), NULL },
 304 { 0x8769, EXIF_FORMAT_LONG_UNSIGNED, 1,         "ExifOffset",           "SubIFD Exif offset", NULL },
 305         /* subIFD follows */
 306 { 0x829a, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "ExposureTime",         "Exposure time (seconds)", NULL },
 307 { 0x829d, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "FNumber",              "FNumber", NULL },
 308 { 0x8822, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "ExposureProgram",      N_("Exposure program"), ExifExposureProgramList },
 309 { 0x8824, EXIF_FORMAT_STRING, -1,               "SpectralSensitivity",  "Spectral Sensitivity", NULL },
 310 { 0x8827, EXIF_FORMAT_SHORT_UNSIGNED, -1,       "ISOSpeedRatings",      N_("ISO sensitivity"), NULL },
 311 { 0x8828, EXIF_FORMAT_UNDEFINED, -1,            "OECF",                 "Optoelectric conversion factor", NULL },
 312 { 0x9000, EXIF_FORMAT_UNDEFINED, 4,             "ExifVersion",          "Exif version", NULL },
 313 { 0x9003, EXIF_FORMAT_STRING, 20,               "DateTimeOriginal",     N_("Date original"), NULL },
 314 { 0x9004, EXIF_FORMAT_STRING, 20,               "DateTimeDigitized",    N_("Date digitized"), NULL },
 315 { 0x9101, EXIF_FORMAT_UNDEFINED, -1,            "ComponentsConfiguration","Pixel format", NULL },
 316 { 0x9102, EXIF_FORMAT_RATIONAL_UNSIGNED,1,      "CompressedBitsPerPixel","Compression ratio", NULL },
 317 { 0x9201, EXIF_FORMAT_RATIONAL, 1,              "ShutterSpeedValue",    N_("Shutter speed"), NULL },
 318 { 0x9202, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "ApertureValue",        N_("Aperture"), NULL },
 319 { 0x9203, EXIF_FORMAT_RATIONAL, 1,              "BrightnessValue",      "Brightness", NULL },
 320 { 0x9204, EXIF_FORMAT_RATIONAL, 1,              "ExposureBiasValue",    N_("Exposure bias"), NULL },
 321 { 0x9205, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "MaxApertureValue",     "Maximum aperture", NULL },
 322 { 0x9206, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "SubjectDistance",      N_("Subject distance"), NULL },
 323 { 0x9207, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "MeteringMode",         N_("Metering mode"), ExifMeteringModeList },
 324 { 0x9208, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "LightSource",          N_("Light source"), ExifLightSourceList },
 325 { 0x9209, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Flash",                N_("Flash"), ExifFlashList },
 326 { 0x920a, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "FocalLength",          N_("Focal length"), NULL },
 327 { 0x9214, EXIF_FORMAT_SHORT_UNSIGNED, -1,       "SubjectArea",          "Subject area", NULL },
 328 { 0x927c, EXIF_FORMAT_UNDEFINED, -1,            "MakerNote",            "MakerNote", NULL },
 329 { 0x9286, EXIF_FORMAT_UNDEFINED, -1,            "UserComment",          "UserComment", NULL },
 330 { 0x9290, EXIF_FORMAT_STRING, -1,               "SubsecTime",           "Subsecond time", NULL },
 331 { 0x9291, EXIF_FORMAT_STRING, -1,               "SubsecTimeOriginal",   "Subsecond time original", NULL },
 332 { 0x9292, EXIF_FORMAT_STRING, -1,               "SubsecTimeDigitized",  "Subsecond time digitized", NULL },
 333 { 0xa000, EXIF_FORMAT_UNDEFINED, 4,             "FlashPixVersion",      "FlashPix version", NULL },
 334 { 0xa001, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "ColorSpace",           "Colorspace", ExifColorSpaceList },
 335         /* ExifImageWidth, ExifImageHeight can also be unsigned short */
 336 { 0xa002, EXIF_FORMAT_LONG_UNSIGNED, 1,         "ExifImageWidth",       N_("Width"), NULL },
 337 { 0xa003, EXIF_FORMAT_LONG_UNSIGNED, 1,         "ExifImageHeight",      N_("Height"), NULL },
 338 { 0xa004, EXIF_FORMAT_STRING, -1,               "RelatedSoundFile",     "Audio data", NULL },
 339 { 0xa005, EXIF_FORMAT_LONG_UNSIGNED, 1,         "ExifInteroperabilityOffset", "ExifR98 extension", NULL },
 340 { 0xa20b, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "FlashEnergy",          "Flash strength", NULL },
 341 { 0xa20c, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "SpatialFrequencyResponse","Spatial frequency response", NULL },
 342 { 0xa20e, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "FocalPlaneXResolution", "X Pixel density", NULL },
 343 { 0xa20f, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "FocalPlaneYResolution", "Y Pixel density", NULL },
 344 { 0xa210, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "FocalPlaneResolutionUnit", "Pixel density units", ExifUnitList },
 345 { 0x0214, EXIF_FORMAT_SHORT_UNSIGNED, 2,        "SubjectLocation",      "Subject location", NULL },
 346 { 0xa215, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "ExposureIndex",        N_("ISO sensitivity"), NULL },
 347 { 0xa217, EXIF_FORMAT_SHORT_UNSIGNED, -1,       "SensingMethod",        "Sensor type", ExifSensorList },
 348 { 0xa300, EXIF_FORMAT_UNDEFINED, 1,             "FileSource",           "Source type", ExifSourceList },
 349 { 0xa301, EXIF_FORMAT_UNDEFINED, 1,             "SceneType",            "Scene type", ExifSceneList },
 350 { 0xa302, EXIF_FORMAT_UNDEFINED, -1,            "CFAPattern",           "Color filter array pattern", NULL },
 351         /* tags a4xx were added for Exif 2.2 (not just these - some above, as well) */
 352 { 0xa401, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "CustomRendered",       "Render process", ExifCustRenderList },
 353 { 0xa402, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "ExposureMode",         "Exposure mode", ExifExposureModeList },
 354 { 0xa403, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "WhiteBalance",         "White balance", ExifWhiteBalanceList },
 355 { 0xa404, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "DigitalZoomRatio",     "Digital zoom ratio", NULL },
 356 { 0xa405, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "FocalLength35mmFilm",  "Focal length (35mm)", NULL },
 357 { 0xa406, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "SceneCapturetype",     "Scene capture type", ExifSceneCaptureList },
 358 { 0xa407, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "GainControl",          "Gain control", ExifGainControlList },
 359 { 0xa408, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Contrast",             "Contrast", ExifContrastList },
 360 { 0xa409, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Saturation",           "Saturation", ExifSaturationList },
 361 { 0xa40a, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Sharpness",            "Sharpness", ExifSharpnessList },
 362 { 0xa40b, EXIF_FORMAT_UNDEFINED, -1,            "DeviceSettingDescription","Device setting", NULL },
 363 { 0xa40c, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "SubjectDistanceRange", "Subject range", ExifSubjectRangeList },
 364 { 0xa420, EXIF_FORMAT_STRING, -1,               "ImageUniqueID",        "Image serial number", NULL },
 365         /* place known, but undocumented or lesser used tags here */
 366 { 0x00fe, EXIF_FORMAT_LONG_UNSIGNED, 1,         "NewSubfileType",       NULL, NULL },
 367 { 0x00ff, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "SubfileType",          NULL, NULL },
 368 { 0x012d, EXIF_FORMAT_SHORT_UNSIGNED, 3,        "TransferFunction",     NULL, NULL },
 369 { 0x013b, EXIF_FORMAT_STRING, -1,               "Artist",               "Artist", NULL },
 370 { 0x013d, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Predictor",            NULL, NULL },
 371 { 0x0142, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "TileWidth",            NULL, NULL },
 372 { 0x0143, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "TileLength",           NULL, NULL },
 373 { 0x0144, EXIF_FORMAT_LONG_UNSIGNED, -1,        "TileOffsets",          NULL, NULL },
 374 { 0x0145, EXIF_FORMAT_SHORT_UNSIGNED, -1,       "TileByteCounts",       NULL, NULL },
 375 { 0x014a, EXIF_FORMAT_LONG_UNSIGNED, -1,        "SubIFDs",              NULL, NULL },
 376 { 0x015b, EXIF_FORMAT_UNDEFINED, -1,            "JPEGTables",           NULL, NULL },
 377 { 0x828d, EXIF_FORMAT_SHORT_UNSIGNED, 2,        "CFARepeatPatternDim",  NULL, NULL },
 378 { 0x828e, EXIF_FORMAT_BYTE_UNSIGNED, -1,        "CFAPattern",           NULL, NULL },
 379 { 0x828f, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "BatteryLevel",         NULL, NULL },
 380 { 0x83bb, EXIF_FORMAT_LONG_UNSIGNED, -1,        "IPTC/NAA",             NULL, NULL },
 381 { 0x8773, EXIF_FORMAT_UNDEFINED, -1,            "ColorProfile",         NULL, NULL },
 382 { 0x8825, EXIF_FORMAT_LONG_UNSIGNED, 1,         "GPSInfo",              "SubIFD GPS offset", NULL },
 383 { 0x8829, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "Interlace",            NULL, NULL },
 384 { 0x882a, EXIF_FORMAT_SHORT, 1,                 "TimeZoneOffset",       NULL, NULL },
 385 { 0x882b, EXIF_FORMAT_SHORT_UNSIGNED, 1,        "SelfTimerMode",        NULL, NULL },
 386 { 0x920b, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "FlashEnergy",          NULL, NULL },
 387 { 0x920c, EXIF_FORMAT_UNDEFINED, -1,            "SpatialFrequencyResponse", NULL, NULL },
 388 { 0x920d, EXIF_FORMAT_UNDEFINED, -1,            "Noise",                NULL, NULL },
 389 { 0x9211, EXIF_FORMAT_LONG_UNSIGNED, 1,         "ImageNumber",          NULL, NULL },
 390 { 0x9212, EXIF_FORMAT_STRING, 1,                "SecurityClassification", NULL, NULL },
 391 { 0x9213, EXIF_FORMAT_STRING, -1,               "ImageHistory",         NULL, NULL },
 392 { 0x9215, EXIF_FORMAT_RATIONAL_UNSIGNED, 1,     "ExposureIndex",        NULL, NULL },
 393 { 0x9216, EXIF_FORMAT_BYTE_UNSIGNED, 4,         "TIFF/EPStandardID",    NULL, NULL },
 394
 395 EXIF_MARKER_LIST_END
 396 };
 397
 398 ExifMarker ExifUnknownMarkersList[] = {
 399 { 0x0000, EXIF_FORMAT_UNKNOWN, 0,               "unknown",      NULL, NULL },
 400 { 0x0000, EXIF_FORMAT_BYTE_UNSIGNED, -1,        "unknown",      NULL, NULL },
 401 { 0x0000, EXIF_FORMAT_STRING, -1,               "unknown",      NULL, NULL },
 402 { 0x0000, EXIF_FORMAT_SHORT_UNSIGNED, -1,       "unknown",      NULL, NULL },
 403 { 0x0000, EXIF_FORMAT_LONG_UNSIGNED, -1,        "unknown",      NULL, NULL },
 404 { 0x0000, EXIF_FORMAT_RATIONAL_UNSIGNED, -1,    "unknown",      NULL, NULL },
 405 { 0x0000, EXIF_FORMAT_BYTE, -1,                 "unknown",      NULL, NULL },
 406 { 0x0000, EXIF_FORMAT_UNDEFINED, -1,            "unknown",      NULL, NULL },
 407 { 0x0000, EXIF_FORMAT_SHORT, -1,                "unknown",      NULL, NULL },
 408 { 0x0000, EXIF_FORMAT_LONG, -1,                 "unknown",      NULL, NULL },
 409 { 0x0000, EXIF_FORMAT_RATIONAL, -1,             "unknown",      NULL, NULL },
 410 { 0x0000, EXIF_FORMAT_FLOAT, -1,                "unknown",      NULL, NULL },
 411 { 0x0000, EXIF_FORMAT_DOUBLE, -1,               "unknown",      NULL, NULL },
 412 };
 413
 414 /* human readable key list */
 415
 416 ExifFormattedText ExifFormattedList[] = {
 417         { "fCamera",            N_("Camera") },
 418         { "fDateTime",          N_("Date") },
 419         { "fShutterSpeed",      N_("Shutter speed") },
 420         { "fAperture",          N_("Aperture") },
 421         { "fExposureBias",      N_("Exposure bias") },
 422         { "fISOSpeedRating",    N_("ISO sensitivity") },
 423         { "fFocalLength",       N_("Focal length") },
 424         { "fSubjectDistance",   N_("Subject distance") },
 425         { "fFlash",             N_("Flash") },
 426         { "fResolution",        N_("Resolution") },
 427         { NULL, NULL }
 428 };
 429
 430
 431 static const ExifMarker *exif_marker_from_tag(guint16 tag, const ExifMarker *list);
 432
 433 /*
 434  *-----------------------------------------------------------------------------
 435  * ExifItem
 436  *-----------------------------------------------------------------------------
 437  */
 438
 439 ExifItem *exif_item_new(ExifFormatType format, guint tag,
 440                         guint elements, const ExifMarker *marker)
 441 {
 442         ExifItem *item;
 443
 444         item = g_new0(ExifItem, 1);
 445         item->format = format;
 446         item->tag = tag;
 447         item->marker = marker;
 448         item->elements = elements;
 449         item->data = NULL;
 450         item->data_len = 0;
 451
 452         switch (format)
 453                 {
 454                 case EXIF_FORMAT_UNKNOWN:
 455                         /* unknown, data is NULL */
 456                         return item;
 457                         break;
 458                 case EXIF_FORMAT_BYTE_UNSIGNED:
 459                         item->data_len = sizeof(char) * elements;
 460                         break;
 461                 case EXIF_FORMAT_STRING:
 462                         item->data_len = sizeof(char) * elements;
 463                         break;
 464                 case EXIF_FORMAT_SHORT_UNSIGNED:
 465                         item->data_len = sizeof(guint16) * elements;
 466                         break;
 467                 case EXIF_FORMAT_LONG_UNSIGNED:
 468                         item->data_len = sizeof(guint32) * elements;
 469                         break;
 470                 case EXIF_FORMAT_RATIONAL_UNSIGNED:
 471                         item->data_len = sizeof(ExifRational) * elements;
 472                         break;
 473                 case EXIF_FORMAT_BYTE:
 474                         item->data_len = sizeof(char) * elements;
 475                         break;
 476                 case EXIF_FORMAT_UNDEFINED:
 477                         item->data_len = sizeof(char) * elements;
 478                         break;
 479                 case EXIF_FORMAT_SHORT:
 480                         item->data_len = sizeof(gint16) * elements;
 481                         break;
 482                 case EXIF_FORMAT_LONG:
 483                         item->data_len = sizeof(gint32) * elements;
 484                         break;
 485                 case EXIF_FORMAT_RATIONAL:
 486                         item->data_len = sizeof(ExifRational) * elements;
 487                         break;
 488                 case EXIF_FORMAT_FLOAT:
 489                         item->data_len = sizeof(float) * elements;
 490                         break;
 491                 case EXIF_FORMAT_DOUBLE:
 492                         item->data_len = sizeof(double) * elements;
 493                         break;
 494                 }
 495
 496         item->data = g_malloc0(item->data_len);
 497
 498         return item;
 499 }
 500
 501 static void exif_item_free(ExifItem *item)
 502 {
 503         if (!item) return;
 504
 505         g_free(item->data);
 506         g_free(item);
 507 }
 508
 509 const char *exif_item_get_tag_name(ExifItem *item)
 510 {
 511         if (!item || !item->marker) return NULL;
 512         return item->marker->key;
 513 }
 514
 515 const char *exif_item_get_description(ExifItem *item)
 516 {
 517         if (!item || !item->marker) return NULL;
 518         return _(item->marker->description);
 519 }
 520
 521 const char *exif_item_get_format_name(ExifItem *item, gint brief)
 522 {
 523         if (!item || !item->marker) return NULL;
 524         return (brief) ? ExifFormatList[item->format].short_name : ExifFormatList[item->format].description;
 525 }
 526
 527 static GString *string_append_raw_bytes(GString *string, gpointer data, gint ne)
 528 {
 529         gint i;
 530
 531         for (i = 0 ; i < ne; i++)
 532                 {
 533                 unsigned char c = ((char *)data)[i];
 534                 if (c < 32 || c > 127) c = '.';
 535                 g_string_append_printf(string, "%c", c);
 536                 }
 537         string = g_string_append(string, " : ");
 538         for (i = 0 ; i < ne; i++)
 539                 {
 540                 const gchar *spacer;
 541                 if (i > 0)
 542                         {
 543                         if (i%8 == 0)
 544                                 {
 545                                 spacer = " - ";
 546                                 }
 547                         else
 548                                 {
 549                                 spacer = " ";
 550                                 }
 551                         }
 552                 else
 553                         {
 554                         spacer = "";
 555                         }
 556                 g_string_append_printf(string, "%s%02x", spacer, ((char *)data)[i]);
 557                 }
 558
 559         return string;
 560 }
 561
 562 gchar *exif_text_list_find_value(ExifTextList *list, guint value)
 563 {
 564         gchar *result = NULL;
 565         gint i;
 566
 567         i = 0;
 568         while (!result && list[i].value >= 0)
 569                 {
 570                 if (value == list[i].value) result = g_strdup(_(list[i].description));
 571                 i++;
 572                 }
 573         if (!result) result = g_strdup_printf("%d (%s)", value, _("unknown"));
 574
 575         return result;
 576 }
 577
 578 /*
 579  *-------------------------------------------------------------------
 580  * byte order utils
 581  *-------------------------------------------------------------------
 582  */
 583
 584 /* note: the align_buf is used to avoid alignment issues (on sparc) */
 585
 586 guint16 exif_byte_get_int16(unsigned char *f, ExifByteOrder bo)
 587 {
 588         guint16 align_buf;
 589
 590         memcpy(&align_buf, f, sizeof(guint16));
 591
 592         if (bo == EXIF_BYTE_ORDER_INTEL)
 593                 return GUINT16_FROM_LE(align_buf);
 594         else
 595                 return GUINT16_FROM_BE(align_buf);
 596 }
 597
 598 guint32 exif_byte_get_int32(unsigned char *f, ExifByteOrder bo)
 599 {
 600         guint32 align_buf;
 601
 602         memcpy(&align_buf, f, sizeof(guint32));
 603
 604         if (bo == EXIF_BYTE_ORDER_INTEL)
 605                 return GUINT32_FROM_LE(align_buf);
 606         else
 607                 return GUINT32_FROM_BE(align_buf);
 608 }
 609
 610 void exif_byte_put_int16(unsigned char *f, guint16 n, ExifByteOrder bo)
 611 {
 612         guint16 align_buf;
 613
 614         if (bo == EXIF_BYTE_ORDER_INTEL)
 615                 {
 616                 align_buf = GUINT16_TO_LE(n);
 617                 }
 618         else
 619                 {
 620                 align_buf = GUINT16_TO_BE(n);
 621                 }
 622
 623         memcpy(f, &align_buf, sizeof(guint16));
 624 }
 625
 626 void exif_byte_put_int32(unsigned char *f, guint32 n, ExifByteOrder bo)
 627 {
 628         guint32 align_buf;
 629
 630         if (bo == EXIF_BYTE_ORDER_INTEL)
 631                 {
 632                 align_buf = GUINT32_TO_LE(n);
 633                 }
 634         else
 635                 {
 636                 align_buf = GUINT32_TO_BE(n);
 637                 }
 638
 639         memcpy(f, &align_buf, sizeof(guint32));
 640 }
 641
 642
 643 /*
 644  *-------------------------------------------------------------------
 645  * IFD utils
 646  *-------------------------------------------------------------------
 647  */
 648
 649 static const ExifMarker *exif_marker_from_tag(guint16 tag, const ExifMarker *list)
 650 {
 651         gint i = 0;
 652
 653         if (!list) return NULL;
 654
 655         while (list[i].tag != 0 && list[i].tag != tag)
 656                 {
 657                 i++;
 658                 }
 659
 660         return (list[i].tag == 0 ? NULL : &list[i]);
 661 }
 662
 663 static void rational_from_data(ExifRational *r, void *src, ExifByteOrder bo)
 664 {
 665         r->num = exif_byte_get_int32(src, bo);
 666         r->den = exif_byte_get_int32(src + sizeof(guint32), bo);
 667 }
 668
 669 /* src_format and item->format must be compatible
 670  * and not overrun src or item->data.
 671  */
 672 void exif_item_copy_data(ExifItem *item, void *src, guint len,
 673                          ExifFormatType src_format, ExifByteOrder bo)
 674 {
 675         gint bs;
 676         gint ne;
 677         gpointer dest;
 678         gint i;
 679
 680         bs = ExifFormatList[item->format].size;
 681         ne = item->elements;
 682         dest = item->data;
 683
 684         if (!dest ||
 685             ExifFormatList[src_format].size * ne > len)
 686                 {
 687                 printf("exif tag %s data size mismatch\n", exif_item_get_tag_name(item));
 688                 return;
 689                 }
 690
 691         switch (item->format)
 692                 {
 693                 case EXIF_FORMAT_UNKNOWN:
 694                         break;
 695                 case EXIF_FORMAT_BYTE_UNSIGNED:
 696                 case EXIF_FORMAT_BYTE:
 697                 case EXIF_FORMAT_UNDEFINED:
 698                         memcpy(dest, src, len);
 699                         break;
 700                 case EXIF_FORMAT_STRING:
 701                         memcpy(dest, src, len);
 702                         /* string is NULL terminated, make sure this is true */
 703                         if (((char *)dest)[len - 1] != '\0') ((char *)dest)[len - 1] = '\0';
 704                         break;
 705                 case EXIF_FORMAT_SHORT_UNSIGNED:
 706                 case EXIF_FORMAT_SHORT:
 707                         for (i = 0; i < ne; i++)
 708                                 {
 709                                 ((guint16 *)dest)[i] = exif_byte_get_int16(src + i * bs, bo);
 710                                 }
 711                         break;
 712                 case EXIF_FORMAT_LONG_UNSIGNED:
 713                 case EXIF_FORMAT_LONG:
 714                         if (src_format == EXIF_FORMAT_SHORT_UNSIGNED ||
 715                             src_format == EXIF_FORMAT_SHORT)
 716                                 {
 717                                 /* a short fits into a long, so allow it */
 718                                 gint ss;
 719
 720                                 ss = ExifFormatList[src_format].size;
 721                                 for (i = 0; i < ne; i++)
 722                                         {
 723                                         ((gint32 *)dest)[i] =
 724                                                 (gint32)exif_byte_get_int16(src + i * ss, bo);
 725                                         }
 726                                 }
 727                         else
 728                                 {
 729                                 for (i = 0; i < ne; i++)
 730                                         {
 731                                         ((gint32 *)dest)[i] =
 732                                                 exif_byte_get_int32(src + i * bs, bo);
 733                                         }
 734                                 }
 735                         break;
 736                 case EXIF_FORMAT_RATIONAL_UNSIGNED:
 737                 case EXIF_FORMAT_RATIONAL:
 738                         for (i = 0; i < ne; i++)
 739                                 {
 740                                 rational_from_data(&((ExifRational *)dest)[i], src + i * bs, bo);
 741                                 }
 742                         break;
 743                 case EXIF_FORMAT_FLOAT:
 744                         for (i = 0; i < ne; i++)
 745                                 {
 746                                 ((float *)dest)[i] = exif_byte_get_int32(src + i * bs, bo);
 747                                 }
 748                         break;
 749                 case EXIF_FORMAT_DOUBLE:
 750                         for (i = 0; i < ne; i++)
 751                                 {
 752                                 ExifRational r;
 753
 754                                 rational_from_data(&r, src + i * bs, bo);
 755                                 if (r.den) ((double *)dest)[i] = (double)r.num / r.den;
 756                                 }
 757                         break;
 758                 }
 759 }
 760
 761 static gint exif_parse_IFD_entry(ExifData *exif, unsigned char *tiff, guint offset,
 762                                  guint size, ExifByteOrder bo,
 763                                  gint level,
 764                                  const ExifMarker *list)
 765 {
 766         guint tag;
 767         guint format;
 768         guint count;
 769         guint data_val;
 770         guint data_offset;
 771         guint data_length;
 772         const ExifMarker *marker;
 773         ExifItem *item;
 774
 775         tag = exif_byte_get_int16(tiff + offset + EXIF_TIFD_OFFSET_TAG, bo);
 776         format = exif_byte_get_int16(tiff + offset + EXIF_TIFD_OFFSET_FORMAT, bo);
 777         count = exif_byte_get_int32(tiff + offset + EXIF_TIFD_OFFSET_COUNT, bo);
 778         data_val = exif_byte_get_int32(tiff + offset + EXIF_TIFD_OFFSET_DATA, bo);
 779
 780         /* Check tag type. If it does not match, either the format is wrong,
 781          * either it is a unknown tag; so it is not really an error.
 782          */
 783         marker = exif_marker_from_tag(tag, list);
 784         if (!marker)
 785                 {
 786                 if (format >= EXIF_FORMAT_COUNT)
 787                         {
 788                         printf("warning: exif tag 0x%4x has invalid format %d\n", tag, format);
 789                         return 0;
 790                         }
 791                 /* allow non recognized tags to be displayed */
 792                 marker = &ExifUnknownMarkersList[format];
 793                 }
 794         if (marker->format != format)
 795                 {
 796                 /* Some cameras got mixed up signed/unsigned_rational
 797                  * eg KODAK DC4800 on object_distance tag
 798                  *
 799                  * FIXME: what exactly is this test trying to do?
 800                  * ok, so this test is to allow the case of swapped signed/unsigned mismatch to leak through?
 801                  */
 802                 if (!(marker->format == EXIF_FORMAT_RATIONAL_UNSIGNED && format == EXIF_FORMAT_RATIONAL) &&
 803                     !(marker->format == EXIF_FORMAT_RATIONAL && format == EXIF_FORMAT_RATIONAL_UNSIGNED) &&
 804                         /* short fits into a long so allow this mismatch
 805                          * as well (some tags allowed to be unsigned short _or_ unsigned long)
 806                          */
 807                     !(marker->format == EXIF_FORMAT_LONG_UNSIGNED && format == EXIF_FORMAT_SHORT_UNSIGNED) )
 808                         {
 809                         if (format < EXIF_FORMAT_COUNT)
 810                                 {
 811                                 printf("warning: exif tag %s format mismatch, found %s exif spec requests %s\n",
 812                                         marker->key, ExifFormatList[format].short_name,
 813                                         ExifFormatList[marker->format].short_name);
 814                                 }
 815                         else
 816                                 {
 817                                 printf("warning: exif tag %s format mismatch, found unknown id %d exif spec requests %d (%s)\n",
 818                                         marker->key, format, marker->format,
 819                                         ExifFormatList[marker->format].short_name);
 820                                 }
 821                         return 0;
 822                         }
 823                 }
 824
 825         /* Where is the data, is it available?
 826          */
 827         if (marker->components > 0 && marker->components != count)
 828                 {
 829                 printf("warning: exif tag %s has %d elements, exif spec requests %d\n",
 830                         marker->key, count, marker->components);
 831                 }
 832
 833         data_length = ExifFormatList[marker->format].size * count;
 834         if (data_length > 4)
 835                 {
 836                 data_offset = data_val;
 837                 if (size < data_offset + data_length)
 838                         {
 839                         printf("warning: exif tag %s data will overrun end of file, ignored.\n", marker->key);
 840                         return -1;
 841                         }
 842                 }
 843         else
 844                 {
 845                 data_offset = offset + EXIF_TIFD_OFFSET_DATA;
 846                 }
 847
 848         item = exif_item_new(marker->format, tag, count, marker);
 849         exif_item_copy_data(item, tiff + data_offset, data_length, format, bo);
 850         exif->items = g_list_prepend(exif->items, item);
 851
 852         if (list == ExifKnownMarkersList)
 853                 {
 854                 switch (item->tag)
 855                         {
 856                         case TAG_EXIFOFFSET:
 857                                 exif_parse_IFD_table(exif, tiff, data_val, size, bo, level + 1, list);
 858                                 break;
 859                         case TAG_EXIFMAKERNOTE:
 860                                 format_exif_makernote_parse(exif, tiff, data_val, size, bo);
 861                                 break;
 862                         }
 863                 }
 864
 865         return 0;
 866 }
 867
 868 gint exif_parse_IFD_table(ExifData *exif,
 869                           unsigned char *tiff, guint offset,
 870                           guint size, ExifByteOrder bo,
 871                           gint level,
 872                           const ExifMarker *list)
 873 {
 874         guint count;
 875         guint i;
 876
 877         /* limit damage from infinite loops */
 878         if (level > EXIF_TIFF_MAX_LEVELS) return -1;
 879
 880         /* We should be able to read number of entries in IFD0) */
 881         if (size < offset + 2) return -1;
 882
 883         count = exif_byte_get_int16(tiff + offset, bo);
 884         offset += 2;
 885
 886         /* Entries and next IFD offset must be readable */
 887         if (size < offset + count * EXIF_TIFD_SIZE + 4) return -1;
 888
 889         for (i = 0; i < count; i++)
 890                 {
 891                 exif_parse_IFD_entry(exif, tiff, offset + i * EXIF_TIFD_SIZE, size, bo, level, list);
 892                 }
 893
 894         return 0;
 895 }
 896
 897 /*
 898  *-------------------------------------------------------------------
 899  * file formats
 900  *-------------------------------------------------------------------
 901  */
 902
 903 gint exif_tiff_directory_offset(unsigned char *data, const guint len,
 904                                 guint *offset, ExifByteOrder *bo)
 905 {
 906         if (len < 8) return FALSE;
 907
 908         if (memcmp(data, "II", 2) == 0)
 909                 {
 910                 *bo = EXIF_BYTE_ORDER_INTEL;
 911                 }
 912         else if (memcmp(data, "MM", 2) == 0)
 913                 {
 914                 *bo = EXIF_BYTE_ORDER_MOTOROLA;
 915                 }
 916         else
 917                 {
 918                 return FALSE;
 919                 }
 920
 921         if (exif_byte_get_int16(data + 2, *bo) != 0x002A)
 922                 {
 923                 return FALSE;
 924                 }
 925
 926         *offset = exif_byte_get_int32(data + 4, *bo);
 927
 928         return (*offset < len);
 929 }
 930
 931 gint exif_tiff_parse(ExifData *exif, unsigned char *tiff, guint size, ExifMarker *list)
 932 {
 933         ExifByteOrder bo;
 934         guint offset;
 935
 936         if (!exif_tiff_directory_offset(tiff, size, &offset, &bo)) return -1;
 937
 938         return exif_parse_IFD_table(exif, tiff, offset, size, bo, 0, list);
 939 }
 940
 941 /*
 942  *-------------------------------------------------------------------
 943  * jpeg marker utils
 944  *-------------------------------------------------------------------
 945  */
 946
 947 #define JPEG_MARKER             0xFF
 948 #define JPEG_MARKER_SOI         0xD8
 949 #define JPEG_MARKER_EOI         0xD9
 950 #define JPEG_MARKER_APP1        0xE1
 951 #define JPEG_MARKER_APP2        0xE2
 952
 953 /* jpeg container format:
 954      all data markers start with 0XFF
 955      2 byte long file start and end markers: 0xFFD8(SOI) and 0XFFD9(EOI)
 956      4 byte long data segment markers in format: 0xFFTTSSSSNNN...
 957        FF:   1 byte standard marker identifier
 958        TT:   1 byte data type
 959        SSSS: 2 bytes in Motorola byte alignment for length of the data.
 960              This value includes these 2 bytes in the count, making actual
 961              length of NN... == SSSS - 2.
 962        NNN.: the data in this segment
 963  */
 964
 965 static gint exif_jpeg_segment_find(unsigned char *data, guint size,
 966                                    guchar app_marker, const gchar *magic, guint magic_len,
 967                                    guint *seg_offset, guint *seg_length)
 968 {
 969         guchar marker = 0;
 970         guint offset = 0;
 971         guint length = 0;
 972
 973         while (marker != app_marker &&
 974                marker != JPEG_MARKER_EOI)
 975                 {
 976                 offset += length;
 977                 length = 2;
 978
 979                 if (offset + 2 >= size ||
 980                     data[offset] != JPEG_MARKER) return FALSE;
 981
 982                 marker = data[offset + 1];
 983                 if (marker != JPEG_MARKER_SOI &&
 984                     marker != JPEG_MARKER_EOI)
 985                         {
 986                         if (offset + 4 >= size) return FALSE;
 987                         length += exif_byte_get_int16(data + offset + 2, EXIF_BYTE_ORDER_MOTOROLA);
 988                         }
 989                 }
 990
 991         if (marker == app_marker &&
 992             offset + length < size &&
 993             length >= 4 + magic_len &&
 994             memcmp(data + offset + 4, magic, magic_len) == 0)
 995                 {
 996                 *seg_offset = offset + 4;
 997                 *seg_length = length - 4;
 998                 return TRUE;
 999                 }
1000
1001         return FALSE;
1002 }
1003
1004 static ExifMarker jpeg_color_marker = { 0x8773, EXIF_FORMAT_UNDEFINED, -1, "ColorProfile", NULL, NULL };
1005
1006 static gint exif_jpeg_parse_color(ExifData *exif, unsigned char *data, guint size)
1007 {
1008         guint seg_offset = 0;
1009         guint seg_length = 0;
1010         guint chunk_offset[255];
1011         guint chunk_length[255];
1012         guint chunk_count = 0;
1013
1014         /* For jpeg/jfif, ICC color profile data can be in more than one segment.
1015            the data is in APP2 data segments that start with "ICC_PROFILE\x00\xNN\xTT"
1016            NN = segment number for data
1017            TT = total number of ICC segments (TT in each ICC segment should match)
1018          */
1019
1020         while (exif_jpeg_segment_find(data + seg_offset + seg_length,
1021                                       size - seg_offset - seg_length,
1022                                       JPEG_MARKER_APP2,
1023                                       "ICC_PROFILE\x00", 12,
1024                                       &seg_offset, &seg_length))
1025                 {
1026                 guchar chunk_num;
1027                 guchar chunk_tot;
1028
1029                 if (seg_length < 14) return FALSE;
1030
1031                 chunk_num = data[seg_offset + 12];
1032                 chunk_tot = data[seg_offset + 13];
1033
1034                 if (chunk_num == 0 || chunk_tot == 0) return FALSE;
1035
1036                 if (chunk_count == 0)
1037                         {
1038                         guint i;
1039
1040                         chunk_count = (guint)chunk_tot;
1041                         for (i = 0; i < chunk_count; i++) chunk_offset[i] = 0;
1042                         for (i = 0; i < chunk_count; i++) chunk_length[i] = 0;
1043                         }
1044
1045                 if (chunk_tot != chunk_count ||
1046                     chunk_num > chunk_count) return FALSE;
1047
1048                 chunk_num--;
1049                 chunk_offset[chunk_num] = seg_offset + 14;
1050                 chunk_length[chunk_num] = seg_length - 14;
1051                 }
1052
1053         if (chunk_count > 0)
1054                 {
1055                 ExifItem *item;
1056                 unsigned char *cp_data;
1057                 guint cp_length = 0;
1058                 guint i;
1059
1060                 for (i = 0; i < chunk_count; i++) cp_length += chunk_length[i];
1061                 cp_data = g_malloc(cp_length);
1062
1063                 for (i = 0; i < chunk_count; i++)
1064                         {
1065                         if (chunk_offset[i] == 0)
1066                                 {
1067                                 /* error, we never saw this chunk */
1068                                 g_free(cp_data);
1069                                 return FALSE;
1070                                 }
1071                         memcpy(cp_data, data + chunk_offset[i], chunk_length[i]);
1072                         }
1073
1074                 item = exif_item_new(jpeg_color_marker.format, jpeg_color_marker.tag, 1,
1075                                      &jpeg_color_marker);
1076                 g_free(item->data);
1077                 item->data = cp_data;
1078                 item->elements = cp_length;
1079                 item->data_len = cp_length;
1080                 exif->items = g_list_prepend(exif->items, item);
1081
1082                 return TRUE;
1083                 }
1084
1085         return FALSE;
1086 }
1087
1088 static gint exif_jpeg_parse(ExifData *exif,
1089                             unsigned char *data, guint size,
1090                             ExifMarker *list, gint parse_color)
1091 {
1092         guint seg_offset = 0;
1093         guint seg_length = 0;
1094         gint res = -1;
1095
1096         if (size < 4 ||
1097             memcmp(data, "\xFF\xD8", 2) != 0)
1098                 {
1099                 return -2;
1100                 }
1101
1102         if (exif_jpeg_segment_find(data, size, JPEG_MARKER_APP1,
1103                                    "Exif\x00\x00", 6,
1104                                    &seg_offset, &seg_length))
1105                 {
1106                 res = exif_tiff_parse(exif, data + seg_offset + 6, seg_length - 6, list);
1107                 }
1108
1109         if (parse_color &&
1110             exif_jpeg_parse_color(exif, data, size))
1111                 {
1112                 res = 0;
1113                 }
1114
1115         return res;
1116 }
1117
1118
1119 /*
1120  *-------------------------------------------------------------------
1121  * misc
1122  *-------------------------------------------------------------------
1123  */
1124
1125 static gint map_file(const gchar *path, void **mapping, int *size)
1126 {
1127         int fd;
1128         struct stat fs;
1129
1130         if ((fd = open(path, O_RDONLY)) == -1)
1131                 {
1132                 perror(path);
1133                 return -1;
1134                 }
1135
1136         if (fstat(fd, &fs) == -1)
1137                 {
1138                 perror(path);
1139                 close(fd);
1140                 return -1;
1141                 }
1142
1143         *size = fs.st_size;
1144
1145         if ((*mapping = mmap(0, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0)) == MAP_FAILED)
1146                 {
1147                 perror(path);
1148                 close(fd);
1149                 return -1;
1150                 }
1151
1152         close(fd);
1153         return 0;
1154 }
1155
1156 static gint unmap_file(void *mapping, int size)
1157 {
1158         if (munmap(mapping, size) == -1)
1159                 {
1160                 perror("munmap");
1161                 return -1;
1162                 }
1163
1164         return 0;
1165 }
1166
1167 void exif_free(ExifData *exif)
1168 {
1169         GList *work;
1170
1171         if (!exif) return;
1172
1173         work = exif->items;
1174         while (work)
1175                 {
1176                 ExifItem *item = work->data;
1177                 work = work->next;
1178                 exif_item_free(item);
1179                 }
1180
1181         g_list_free(exif->items);
1182         g_free(exif);
1183 }
1184
1185 ExifData *exif_read(FileData *fd, gint parse_color_profile)
1186 {
1187         ExifData *exif;
1188         void *f;
1189         int size, res;
1190         gchar *pathl;
1191
1192         if (!fd) return NULL;
1193
1194         pathl = path_from_utf8(fd->path);
1195         if (map_file(pathl, &f, &size) == -1)
1196                 {
1197                 g_free(pathl);
1198                 return NULL;
1199                 }
1200         g_free(pathl);
1201
1202         exif = g_new0(ExifData, 1);
1203         exif->items = NULL;
1204
1205         if ((res = exif_jpeg_parse(exif, (unsigned char *)f, size,
1206                                    ExifKnownMarkersList,
1207                                    parse_color_profile)) == -2)
1208                 {
1209                 res = exif_tiff_parse(exif, (unsigned char *)f, size, ExifKnownMarkersList);
1210                 }
1211
1212         if (res != 0)
1213                 {
1214                 FormatRawExifType exif_type;
1215                 FormatRawExifParseFunc exif_parse_func;
1216                 guint32 offset = 0;
1217
1218                 exif_type = format_raw_exif_offset(f, size, &offset, &exif_parse_func);
1219                 switch (exif_type)
1220                         {
1221                         case FORMAT_RAW_EXIF_NONE:
1222                         default:
1223                                 break;
1224                         case FORMAT_RAW_EXIF_TIFF:
1225                                 res = exif_tiff_parse(exif, (unsigned char*)f + offset, size - offset,
1226                                                       ExifKnownMarkersList);
1227                                 break;
1228                         case FORMAT_RAW_EXIF_JPEG:
1229                                 res = exif_jpeg_parse(exif, (unsigned char*)f + offset, size - offset,
1230                                                       ExifKnownMarkersList, FALSE);
1231                                 break;
1232                         case FORMAT_RAW_EXIF_IFD_II:
1233                         case FORMAT_RAW_EXIF_IFD_MM:
1234                                 res = exif_parse_IFD_table(exif, (unsigned char*)f, offset, size - offset,
1235                                                            (exif_type == FORMAT_RAW_EXIF_IFD_II) ?
1236                                                                 EXIF_BYTE_ORDER_INTEL : EXIF_BYTE_ORDER_MOTOROLA,
1237                                                            0, ExifKnownMarkersList);
1238                                 break;
1239                         case FORMAT_RAW_EXIF_PROPRIETARY:
1240                                 if (exif_parse_func)
1241                                         {
1242                                         res = exif_parse_func((unsigned char*)f + offset, size - offset, exif);
1243                                         }
1244                                 break;
1245                         }
1246                 }
1247
1248         if (res != 0)
1249                 {
1250                 exif_free(exif);
1251                 exif = NULL;
1252                 }
1253
1254         unmap_file(f, size);
1255
1256         if (exif) exif->items = g_list_reverse(exif->items);
1257
1258 #if 0
1259         exif_write_data_list(exif, stdout, TRUE);
1260         exif_write_data_list(exif, stdout, FALSE);
1261 #endif
1262
1263         return exif;
1264 }
1265
1266 ExifItem *exif_get_item(ExifData *exif, const gchar *key)
1267 {
1268         GList *work;
1269
1270         if (!key) return NULL;
1271
1272         work = exif->items;
1273         while (work)
1274                 {
1275                 ExifItem *item;
1276
1277                 item = work->data;
1278                 work = work->next;
1279                 if (item->marker->key && strcmp(key, item->marker->key) == 0) return item;
1280                 }
1281         return NULL;
1282 }
1283
1284 #define EXIF_DATA_AS_TEXT_MAX_COUNT 16
1285
1286 gchar *exif_item_get_data_as_text(ExifItem *item)
1287 {
1288         const ExifMarker *marker;
1289         gpointer data;
1290         GString *string;
1291         gchar *text;
1292         gint ne;
1293         gint i;
1294
1295         if (!item) return NULL;
1296
1297         marker = item->marker;
1298         if (!marker) return NULL;
1299
1300         data = item->data;
1301         ne = item->elements;
1302         if (ne > EXIF_DATA_AS_TEXT_MAX_COUNT) ne = EXIF_DATA_AS_TEXT_MAX_COUNT;
1303         string = g_string_new("");
1304         switch (item->format)
1305                 {
1306                 case EXIF_FORMAT_UNKNOWN:
1307                         break;
1308                 case EXIF_FORMAT_BYTE_UNSIGNED:
1309                 case EXIF_FORMAT_BYTE:
1310                 case EXIF_FORMAT_UNDEFINED:
1311                         if (ne == 1 && marker->list)
1312                                 {
1313                                 gchar *result;
1314                                 unsigned char val;
1315
1316                                 if (item->format == EXIF_FORMAT_BYTE_UNSIGNED ||
1317                                     item->format == EXIF_FORMAT_UNDEFINED)
1318                                         {
1319                                         val = ((unsigned char *)data)[0];
1320                                         }
1321                                 else
1322                                         {
1323                                         val = (unsigned char)(((signed char *)data)[0]);
1324                                         }
1325
1326                                 result = exif_text_list_find_value(marker->list, (guint)val);
1327                                 string = g_string_append(string, result);
1328                                 g_free(result);
1329                                 }
1330                         else
1331                                 {
1332                                 string = string_append_raw_bytes(string, data, ne);
1333                                 }
1334                         break;
1335                 case EXIF_FORMAT_STRING:
1336                         string = g_string_append(string, (gchar *)(item->data));
1337                         break;
1338                 case EXIF_FORMAT_SHORT_UNSIGNED:
1339                         if (ne == 1 && marker->list)
1340                                 {
1341                                 gchar *result;
1342
1343                                 result = exif_text_list_find_value(marker->list, ((guint16 *)data)[0]);
1344                                 string = g_string_append(string, result);
1345                                 g_free(result);
1346                                 }
1347                         else for (i = 0; i < ne; i++)
1348                                 {
1349                                 g_string_append_printf(string, "%s%hd", (i > 0) ? ", " : "",
1350                                                         ((guint16 *)data)[i]);
1351                                 }
1352                         break;
1353                 case EXIF_FORMAT_LONG_UNSIGNED:
1354                         for (i = 0; i < ne; i++)
1355                                 {
1356                                 g_string_append_printf(string, "%s%ld", (i > 0) ? ", " : "",
1357                                                         (unsigned long int)((guint32 *)data)[i]);
1358                                 }
1359                         break;
1360                 case EXIF_FORMAT_RATIONAL_UNSIGNED:
1361                         for (i = 0; i < ne; i++)
1362                                 {
1363                                 ExifRational *r;
1364
1365                                 r = &((ExifRational *)data)[i];
1366                                 g_string_append_printf(string, "%s%ld/%ld", (i > 0) ? ", " : "",
1367                                                         (unsigned long)r->num, (unsigned long)r->den);
1368                                 }
1369                         break;
1370                 case EXIF_FORMAT_SHORT:
1371                         for (i = 0; i < ne; i++)
1372                                 {
1373                                 g_string_append_printf(string, "%s%hd", (i > 0) ? ", " : "",
1374                                                         ((gint16 *)data)[i]);
1375                                 }
1376                         break;
1377                 case EXIF_FORMAT_LONG:
1378                         for (i = 0; i < ne; i++)
1379                                 {
1380                                 g_string_append_printf(string, "%s%ld", (i > 0) ? ", " : "",
1381                                                         (long int)((gint32 *)data)[i]);
1382                                 }
1383                         break;
1384                 case EXIF_FORMAT_RATIONAL:
1385                         for (i = 0; i < ne; i++)
1386                                 {
1387                                 ExifRational *r;
1388
1389                                 r = &((ExifRational *)data)[i];
1390                                 g_string_append_printf(string, "%s%ld/%ld", (i > 0) ? ", " : "",
1391                                                         (long)r->num, (long)r->den);
1392                                 }
1393                         break;
1394                 case EXIF_FORMAT_FLOAT:
1395                         for (i = 0; i < ne; i++)
1396                                 {
1397                                 g_string_append_printf(string, "%s%f", (i > 0) ? ", " : "",
1398                                                         ((float *)data)[i]);
1399                                 }
1400                         break;
1401                 case EXIF_FORMAT_DOUBLE:
1402                         for (i = 0; i < ne; i++)
1403                                 {
1404                                 g_string_append_printf(string, "%s%f", (i > 0) ? ", " : "",
1405                                                         ((double *)data)[i]);
1406                                 }
1407                         break;
1408                 }
1409
1410         if (item->elements > EXIF_DATA_AS_TEXT_MAX_COUNT &&
1411             item->format != EXIF_FORMAT_STRING)
1412                 {
1413                 g_string_append(string, " ...");
1414                 }
1415
1416         text = string->str;
1417         g_string_free(string, FALSE);
1418
1419         return text;
1420 }
1421
1422 gint exif_item_get_integer(ExifItem *item, gint *value)
1423 {
1424         if (!item) return FALSE;
1425
1426         switch (item->format)
1427                 {
1428                 case EXIF_FORMAT_SHORT:
1429                         *value = (gint)(((gint16 *)(item->data))[0]);
1430                         return TRUE;
1431                         break;
1432                 case EXIF_FORMAT_SHORT_UNSIGNED:
1433                         *value = (gint)(((guint16 *)(item->data))[0]);
1434                         return TRUE;
1435                         break;
1436                 case EXIF_FORMAT_LONG:
1437                         *value = (gint)(((gint32 *)(item->data))[0]);
1438                         return TRUE;
1439                         break;
1440                 case EXIF_FORMAT_LONG_UNSIGNED:
1441                         /* FIXME: overflow possible */
1442                         *value = (gint)(((guint32 *)(item->data))[0]);
1443                         return TRUE;
1444                 default:
1445                         /* all other type return FALSE */
1446                         break;
1447                 }
1448         return FALSE;
1449 }
1450
1451 gint exif_get_integer(ExifData *exif, const gchar *key, gint *value)
1452 {
1453         ExifItem *item;
1454
1455         item = exif_get_item(exif, key);
1456         return exif_item_get_integer(item, value);
1457 }
1458
1459 ExifRational *exif_item_get_rational(ExifItem *item, gint *sign)
1460 {
1461         if (!item) return NULL;
1462
1463         if (item->format == EXIF_FORMAT_RATIONAL ||
1464             item->format == EXIF_FORMAT_RATIONAL_UNSIGNED)
1465                 {
1466                 if (sign) *sign = (item->format == EXIF_FORMAT_RATIONAL);
1467                 return &((ExifRational *)(item->data))[0];
1468                 }
1469
1470         return NULL;
1471 }
1472
1473 ExifRational *exif_get_rational(ExifData *exif, const gchar *key, gint *sign)
1474 {
1475         ExifItem *item;
1476
1477         item = exif_get_item(exif, key);
1478         return exif_item_get_rational(item, sign);
1479 }
1480
1481 double exif_rational_to_double(ExifRational *r, gint sign)
1482 {
1483         if (!r || r->den == 0.0) return 0.0;
1484
1485         if (sign) return (double)((int)r->num) / (double)((int)r->den);
1486         return (double)r->num / r->den;
1487 }
1488
1489 static double exif_get_rational_as_double(ExifData *exif, const gchar *key)
1490 {
1491         ExifRational *r;
1492         gint sign;
1493
1494         r = exif_get_rational(exif, key, &sign);
1495         return exif_rational_to_double(r, sign);
1496 }
1497
1498 static GString *append_comma_text(GString *string, const gchar *text)
1499 {
1500         string = g_string_append(string, ", ");
1501         string = g_string_append(string, text);
1502
1503         return string;
1504 }
1505
1506 static gchar *exif_get_formatted_by_key(ExifData *exif, const gchar *key, gint *key_valid)
1507 {
1508         /* must begin with f, else not formatted */
1509         if (key[0] != 'f')
1510                 {
1511                 if (key_valid) *key_valid = FALSE;
1512                 return NULL;
1513                 }
1514
1515         if (key_valid) *key_valid = TRUE;
1516
1517         if (strcmp(key, "fCamera") == 0)
1518                 {
1519                 gchar *text;
1520                 gchar *make = exif_get_data_as_text(exif, "Make");
1521                 gchar *model = exif_get_data_as_text(exif, "Model");
1522                 gchar *software = exif_get_data_as_text(exif, "Software");
1523
1524                 text = g_strdup_printf("%s%s%s%s%s%s", (make) ? make : "", ((make) && (model)) ? " " : "",
1525                                                        (model) ? model : "",
1526                                                        (software) ? " (" : "",
1527                                                        (software) ? software : "",
1528                                                        (software) ? ")" : "");
1529
1530                 g_free(make);
1531                 g_free(model);
1532                 g_free(software);
1533                 return text;
1534                 }
1535         if (strcmp(key, "fDateTime") == 0)
1536                 {
1537                 gchar *text = exif_get_data_as_text(exif, "DateTimeOriginal");
1538                 gchar *subsec = NULL;
1539                 if (text) subsec = exif_get_data_as_text(exif, "SubsecTimeOriginal");
1540                 if (!text)
1541                         {
1542                         text = exif_get_data_as_text(exif, "DateTime");
1543                         if (text) subsec = exif_get_data_as_text(exif, "SubsecTime");
1544                         }
1545                 if (subsec)
1546                         {
1547                         gchar *tmp = text;
1548                         text = g_strconcat(tmp, ".", subsec, NULL);
1549                         g_free(tmp);
1550                         g_free(subsec);
1551                         }
1552                 return text;
1553                 }
1554         if (strcmp(key, "fShutterSpeed") == 0)
1555                 {
1556                 ExifRational *r;
1557
1558                 r = exif_get_rational(exif, "ExposureTime", NULL);
1559                 if (r && r->num && r->den)
1560                         {
1561                         double n = (double)r->den / (double)r->num;
1562                         return g_strdup_printf("%s%.0fs", n > 1.0 ? "1/" : "",
1563                                                           n > 1.0 ? n : 1.0 / n);
1564                         }
1565                 r = exif_get_rational(exif, "ShutterSpeedValue", NULL);
1566                 if (r && r->num  && r->den)
1567                         {
1568                         double n = pow(2.0, exif_rational_to_double(r, TRUE));
1569
1570                         /* Correct exposure time to avoid values like 1/91s (seen on Minolta DImage 7) */
1571                         if (n > 1.0 && (int)n - ((int)(n/10))*10 == 1) n--;
1572
1573                         return g_strdup_printf("%s%.0fs", n > 1.0 ? "1/" : "",
1574                                                           n > 1.0 ? floor(n) : 1.0 / n);
1575                         }
1576                 return NULL;
1577                 }
1578         if (strcmp(key, "fAperture") == 0)
1579                 {
1580                 double n;
1581
1582                 n = exif_get_rational_as_double(exif, "FNumber");
1583                 if (n == 0.0) n = exif_get_rational_as_double(exif, "ApertureValue");
1584                 if (n == 0.0) return NULL;
1585
1586                 return g_strdup_printf("f/%.1f", n);
1587                 }
1588         if (strcmp(key, "fExposureBias") == 0)
1589                 {
1590                 ExifRational *r;
1591                 gint sign;
1592                 double n;
1593
1594                 r = exif_get_rational(exif, "ExposureBiasValue", &sign);
1595                 if (!r) return NULL;
1596
1597                 n = exif_rational_to_double(r, sign);
1598                 return g_strdup_printf("%+.1f", n);
1599                 }
1600         if (strcmp(key, "fFocalLength") == 0)
1601                 {
1602                 double n;
1603
1604                 n = exif_get_rational_as_double(exif, "FocalLength");
1605                 if (n == 0.0) return NULL;
1606                 return g_strdup_printf("%.2f mm", n);
1607                 }
1608         if (strcmp(key, "fISOSpeedRating") == 0)
1609                 {
1610                 gchar *text;
1611
1612                 text = exif_get_data_as_text(exif, "ISOSpeedRatings");
1613                 /* kodak may set this instead */
1614                 if (!text) text = exif_get_data_as_text(exif, "ExposureIndex");
1615                 return text;
1616                 }
1617         if (strcmp(key, "fSubjectDistance") == 0)
1618                 {
1619                 ExifRational *r;
1620                 gint sign;
1621                 double n;
1622
1623                 r = exif_get_rational(exif, "SubjectDistance", &sign);
1624                 if (!r) return NULL;
1625
1626                 if ((long)r->num == 0xffffffff) return g_strdup(_("infinity"));
1627                 if ((long)r->num == 0) return g_strdup(_("unknown"));
1628
1629                 n = exif_rational_to_double(r, sign);
1630                 if (n == 0.0) return _("unknown");
1631                 return g_strdup_printf("%.3f m", n);
1632                 }
1633         if (strcmp(key, "fFlash") == 0)
1634                 {
1635                 /* grr, flash is a bitmask... */
1636                 GString *string;
1637                 gchar *text;
1638                 gint n;
1639                 gint v;
1640
1641                 if (!exif_get_integer(exif, "Flash", &n)) return NULL;
1642
1643                 /* Exif 2.1 only defines first 3 bits */
1644                 if (n <= 0x07) return exif_text_list_find_value(ExifFlashList, n);
1645
1646                 /* must be Exif 2.2 */
1647                 string = g_string_new("");
1648
1649                 /* flash fired (bit 0) */
1650                 string = g_string_append(string, (n & 0x01) ? _("yes") : _("no"));
1651
1652                 /* flash mode (bits 3, 4) */
1653                 v = (n >> 3) & 0x03;
1654                 if (v) string = append_comma_text(string, _("mode:"));
1655                 switch (v)
1656                         {
1657                         case 1:
1658                                 string = g_string_append(string, _("on"));
1659                                 break;
1660                         case 2:
1661                                 string = g_string_append(string, _("off"));
1662                                 break;
1663                         case 3:
1664                                 string = g_string_append(string, _("auto"));
1665                                 break;
1666                         }
1667
1668                 /* return light (bits 1, 2) */
1669                 v = (n >> 1) & 0x03;
1670                 if (v == 2) string = append_comma_text(string, _("not detected by strobe"));
1671                 if (v == 3) string = append_comma_text(string, _("detected by strobe"));
1672
1673                 /* we ignore flash function (bit 5) */
1674
1675                 /* red-eye (bit 6) */
1676                 if ((n >> 5) & 0x01) string = append_comma_text(string, _("red-eye reduction"));
1677
1678                 text = string->str;
1679                 g_string_free(string, FALSE);
1680                 return text;
1681                 }
1682         if (strcmp(key, "fResolution") == 0)
1683                 {
1684                 ExifRational *rx, *ry;
1685                 gchar *units;
1686                 gchar *text;
1687
1688                 rx = exif_get_rational(exif, "XResolution", NULL);
1689                 ry = exif_get_rational(exif, "YResolution", NULL);
1690                 if (!rx || !ry) return NULL;
1691
1692                 units = exif_get_data_as_text(exif, "ResolutionUnit");
1693                 text = g_strdup_printf("%0.f x %0.f (%s/%s)", rx->den ? (double)rx->num / rx->den : 1.0,
1694                                                               ry->den ? (double)ry->num / ry->den : 1.0,
1695                                                               _("dot"), (units) ? units : _("unknown"));
1696
1697                 g_free(units);
1698                 return text;
1699                 }
1700
1701         if (key_valid) *key_valid = FALSE;
1702         return NULL;
1703 }
1704
1705 gchar *exif_get_data_as_text(ExifData *exif, const gchar *key)
1706 {
1707         ExifItem *item;
1708         gchar *text;
1709         gint key_valid;
1710
1711         if (!key) return NULL;
1712
1713         text = exif_get_formatted_by_key(exif, key, &key_valid);
1714         if (key_valid) return text;
1715
1716         item = exif_get_item(exif, key);
1717         if (item) return exif_item_get_data_as_text(item);
1718
1719         return NULL;
1720 }
1721
1722 const gchar *exif_get_description_by_key(const gchar *key)
1723 {
1724         gint i;
1725
1726         if (!key) return NULL;
1727
1728         i = 0;
1729         while (ExifFormattedList[i].key != NULL)
1730                 {
1731                 if (strcmp(key, ExifFormattedList[i].key) == 0) return _(ExifFormattedList[i].description);
1732                 i++;
1733                 }
1734
1735         i = 0;
1736         while (ExifKnownMarkersList[i].tag > 0)
1737                 {
1738                 if (strcmp(key, ExifKnownMarkersList[i].key) == 0) return _(ExifKnownMarkersList[i].description);
1739                 i++;
1740                 }
1741
1742         return NULL;
1743 }
1744
1745 static void exif_write_item(FILE *f, ExifItem *item)
1746 {
1747         gchar *text;
1748
1749         text = exif_item_get_data_as_text(item);
1750         if (text)
1751                 {
1752                 fprintf(f, "%4x %9s %30s %s\n", item->tag, ExifFormatList[item->format].short_name,
1753                         exif_item_get_tag_name(item), text);
1754                 }
1755         g_free(text);
1756 }
1757
1758 void exif_write_data_list(ExifData *exif, FILE *f, gint human_readable_list)
1759 {
1760         if (!f || !exif) return;
1761
1762         fprintf(f, " tag   format                             key value\n");
1763         fprintf(f, "----------------------------------------------------\n");
1764
1765         if (human_readable_list)
1766                 {
1767                 gint i;
1768
1769                 i = 0;
1770                 while (ExifFormattedList[i].key)
1771                         {
1772                         gchar *text;
1773
1774                         text = exif_get_formatted_by_key(exif, ExifFormattedList[i].key, NULL);
1775                         if (text)
1776                                 {
1777                                 fprintf(f, "     %9s %30s %s\n", "string", ExifFormattedList[i].key, text);
1778                                 }
1779                         i++;
1780                         }
1781                 }
1782         else
1783                 {
1784                 GList *work;
1785
1786                 work = exif->items;
1787                 while (work)
1788                         {
1789                         ExifItem *item;
1790
1791                         item = work->data;
1792                         work = work->next;
1793
1794                         exif_write_item(f, item);
1795                         }
1796                 }
1797         fprintf(f, "----------------------------------------------------\n");
1798 }
1799