src/exif.c

   1 /*
   2  *  GQView
   3  *  (C) 2004 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,            "InterColorProfile",    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
 527 #define UNDEFINED_TEXT_BYTE_COUNT 16
 528
 529 static GString *string_append_raw_bytes(GString *string, gpointer data, gint ne)
 530 {
 531         gint i;
 532
 533         for (i = 0 ; i < ne && i < UNDEFINED_TEXT_BYTE_COUNT; i++)
 534                 {
 535                 unsigned char c = ((char *)data)[i];
 536                 if (c < 32 || c > 127) c = '.';
 537                 g_string_append_printf(string, "%c", c);
 538                 }
 539         string = g_string_append(string, " : ");
 540         for (i = 0 ; i < ne && i < UNDEFINED_TEXT_BYTE_COUNT; i++)
 541                 {
 542                 const gchar *spacer;
 543                 if (i > 0)
 544                         {
 545                         if (i%8 == 0)
 546                                 {
 547                                 spacer = " - ";
 548                                 }
 549                         else
 550                                 {
 551                                 spacer = " ";
 552                                 }
 553                         }
 554                 else
 555                         {
 556                         spacer = "";
 557                         }
 558                 g_string_append_printf(string, "%s%02x", spacer, ((char *)data)[i]);
 559                 }
 560         if (i >= UNDEFINED_TEXT_BYTE_COUNT) g_string_append_printf(string, " (%d bytes)", ne);
 561
 562         return string;
 563 }
 564
 565 gchar *exif_text_list_find_value(ExifTextList *list, guint value)
 566 {
 567         gchar *result = NULL;
 568         gint i;
 569
 570         i = 0;
 571         while (!result && list[i].value >= 0)
 572                 {
 573                 if (value == list[i].value) result = g_strdup(_(list[i].description));
 574                 i++;
 575                 }
 576         if (!result) result = g_strdup_printf("%d (%s)", value, _("unknown"));
 577
 578         return result;
 579 }
 580
 581 /*
 582  *-------------------------------------------------------------------
 583  * byte size utils
 584  *-------------------------------------------------------------------
 585  */
 586
 587 guint16 exif_byte_get_int16(unsigned char *f, ExifByteOrder bo)
 588 {
 589         if (bo == EXIF_BYTE_ORDER_INTEL)
 590                 return GUINT16_FROM_LE(*(guint16*)f);
 591         else
 592                 return GUINT16_FROM_BE(*(guint16*)f);
 593 }
 594
 595 guint32 exif_byte_get_int32(unsigned char *f, ExifByteOrder bo)
 596 {
 597         if (bo == EXIF_BYTE_ORDER_INTEL)
 598                 return GUINT32_FROM_LE(*(guint32*)f);
 599         else
 600                 return GUINT32_FROM_BE(*(guint32*)f);
 601 }
 602
 603 guint16 exif_byte_swab_int16(guint16 n, ExifByteOrder bo)
 604 {
 605 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
 606         if (bo == EXIF_BYTE_ORDER_MOTOROLA)
 607 #else
 608         if (bo == EXIF_BYTE_ORDER_INTEL)
 609 #endif
 610                 return GUINT16_SWAP_LE_BE(n);
 611         else
 612                 return n;
 613 }
 614
 615 guint32 exif_byte_swab_int32(guint32 n, ExifByteOrder bo)
 616 {
 617 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
 618         if (bo == EXIF_BYTE_ORDER_MOTOROLA)
 619 #else
 620         if (bo == EXIF_BYTE_ORDER_INTEL)
 621 #endif
 622                 return GUINT32_SWAP_LE_BE(n);
 623         else
 624                 return n;
 625 }
 626
 627 /*
 628  *-------------------------------------------------------------------
 629  * IFD utils
 630  *-------------------------------------------------------------------
 631  */
 632
 633 static const ExifMarker *exif_marker_from_tag(guint16 tag, const ExifMarker *list)
 634 {
 635         gint i = 0;
 636
 637         if (!list) return NULL;
 638
 639         while (list[i].tag != 0 && list[i].tag != tag)
 640                 {
 641                 i++;
 642                 }
 643
 644         return (list[i].tag == 0 ? NULL : &list[i]);
 645 }
 646
 647 static void rational_from_data(ExifRational *r, void *src, ExifByteOrder bo)
 648 {
 649         r->num = exif_byte_get_int32(src, bo);
 650         r->den = exif_byte_get_int32(src + sizeof(guint32), bo);
 651 }
 652
 653 /* src_format and item->format must be compatible
 654  * and not overrun src or item->data.
 655  */
 656 void exif_item_copy_data(ExifItem *item, void *src, guint len,
 657                          ExifFormatType src_format, ExifByteOrder bo)
 658 {
 659         gint bs;
 660         gint ne;
 661         gpointer dest;
 662         gint i;
 663
 664         bs = ExifFormatList[item->format].size;
 665         ne = item->elements;
 666         dest = item->data;
 667
 668         if (!dest ||
 669             ExifFormatList[src_format].size * ne > len)
 670                 {
 671                 printf("exif tag %s data size mismatch\n", exif_item_get_tag_name(item));
 672                 return;
 673                 }
 674
 675         switch (item->format)
 676                 {
 677                 case EXIF_FORMAT_UNKNOWN:
 678                         break;
 679                 case EXIF_FORMAT_BYTE_UNSIGNED:
 680                 case EXIF_FORMAT_BYTE:
 681                 case EXIF_FORMAT_UNDEFINED:
 682                         memcpy(dest, src, len);
 683                         break;
 684                 case EXIF_FORMAT_STRING:
 685                         memcpy(dest, src, len);
 686                         /* string is NULL terminated, make sure this is true */
 687                         if (((char *)dest)[len - 1] != '\0') ((char *)dest)[len - 1] = '\0';
 688                         break;
 689                 case EXIF_FORMAT_SHORT_UNSIGNED:
 690                 case EXIF_FORMAT_SHORT:
 691                         for (i = 0; i < ne; i++)
 692                                 {
 693                                 ((guint16 *)dest)[i] = exif_byte_get_int16(src + i * bs, bo);
 694                                 }
 695                         break;
 696                 case EXIF_FORMAT_LONG_UNSIGNED:
 697                 case EXIF_FORMAT_LONG:
 698                         if (src_format == EXIF_FORMAT_SHORT_UNSIGNED ||
 699                             src_format == EXIF_FORMAT_SHORT)
 700                                 {
 701                                 /* a short fits into a long, so allow it */
 702                                 gint ss;
 703
 704                                 ss = ExifFormatList[src_format].size;
 705                                 for (i = 0; i < ne; i++)
 706                                         {
 707                                         ((gint32 *)dest)[i] =
 708                                                 (gint32)exif_byte_get_int16(src + i * ss, bo);
 709                                         }
 710                                 }
 711                         else
 712                                 {
 713                                 for (i = 0; i < ne; i++)
 714                                         {
 715                                         ((gint32 *)dest)[i] =
 716                                                 exif_byte_get_int32(src + i * bs, bo);
 717                                         }
 718                                 }
 719                         break;
 720                 case EXIF_FORMAT_RATIONAL_UNSIGNED:
 721                 case EXIF_FORMAT_RATIONAL:
 722                         for (i = 0; i < ne; i++)
 723                                 {
 724                                 rational_from_data(&((ExifRational *)dest)[i], src + i * bs, bo);
 725                                 }
 726                         break;
 727                 case EXIF_FORMAT_FLOAT:
 728                         for (i = 0; i < ne; i++)
 729                                 {
 730                                 ((float *)dest)[i] = exif_byte_get_int32(src + i * bs, bo);
 731                                 }
 732                         break;
 733                 case EXIF_FORMAT_DOUBLE:
 734                         for (i = 0; i < ne; i++)
 735                                 {
 736                                 ExifRational r;
 737
 738                                 rational_from_data(&r, src + i * bs, bo);
 739                                 if (r.den) ((double *)dest)[i] = (double)r.num / r.den;
 740                                 }
 741                         break;
 742                 }
 743 }
 744
 745 static gint exif_parse_IFD_entry(ExifData *exif, unsigned char *tiff, guint offset,
 746                                  guint size, ExifByteOrder bo,
 747                                  gint level,
 748                                  const ExifMarker *list)
 749 {
 750         guint tag;
 751         guint format;
 752         guint count;
 753         guint data_val;
 754         guint data_offset;
 755         guint data_length;
 756         const ExifMarker *marker;
 757         ExifItem *item;
 758
 759         tag = exif_byte_get_int16(tiff + offset + EXIF_TIFD_OFFSET_TAG, bo);
 760         format = exif_byte_get_int16(tiff + offset + EXIF_TIFD_OFFSET_FORMAT, bo);
 761         count = exif_byte_get_int32(tiff + offset + EXIF_TIFD_OFFSET_COUNT, bo);
 762         data_val = exif_byte_get_int32(tiff + offset + EXIF_TIFD_OFFSET_DATA, bo);
 763
 764         /* Check tag type. If it does not match, either the format is wrong,
 765          * either it is a unknown tag; so it is not really an error.
 766          */
 767         marker = exif_marker_from_tag(tag, list);
 768         if (!marker)
 769                 {
 770                 if (format >= EXIF_FORMAT_COUNT)
 771                         {
 772                         printf("warning: exif tag 0x%4x has invalid format %d\n", tag, format);
 773                         return 0;
 774                         }
 775                 /* allow non recognized tags to be displayed */
 776                 marker = &ExifUnknownMarkersList[format];
 777                 }
 778         if (marker->format != format)
 779                 {
 780                 /* Some cameras got mixed up signed/unsigned_rational
 781                  * eg KODAK DC4800 on object_distance tag
 782                  *
 783                  * FIXME: what exactly is this test trying to do?
 784                  * ok, so this test is to allow the case of swapped signed/unsigned mismatch to leak through?
 785                  */
 786                 if (!(marker->format == EXIF_FORMAT_RATIONAL_UNSIGNED && format == EXIF_FORMAT_RATIONAL) &&
 787                     !(marker->format == EXIF_FORMAT_RATIONAL && format == EXIF_FORMAT_RATIONAL_UNSIGNED) &&
 788                         /* short fits into a long so allow this mismatch
 789                          * as well (some tags allowed to be unsigned short _or_ unsigned long)
 790                          */
 791                     !(marker->format == EXIF_FORMAT_LONG_UNSIGNED && format == EXIF_FORMAT_SHORT_UNSIGNED) )
 792                         {
 793                         if (format < EXIF_FORMAT_COUNT)
 794                                 {
 795                                 printf("warning: exif tag %s format mismatch, found %s exif spec requests %s\n",
 796                                         marker->key, ExifFormatList[format].short_name,
 797                                         ExifFormatList[marker->format].short_name);
 798                                 }
 799                         else
 800                                 {
 801                                 printf("warning: exif tag %s format mismatch, found unknown id %d exif spec requests %d (%s)\n",
 802                                         marker->key, format, marker->format,
 803                                         ExifFormatList[marker->format].short_name);
 804                                 }
 805                         return 0;
 806                         }
 807                 }
 808
 809         /* Where is the data, is it available?
 810          */
 811         if (marker->components > 0 && marker->components != count)
 812                 {
 813                 printf("warning: exif tag %s has %d elements, exif spec requests %d\n",
 814                         marker->key, count, marker->components);
 815                 }
 816
 817         data_length = ExifFormatList[marker->format].size * count;
 818         if (data_length > 4)
 819                 {
 820                 data_offset = data_val;
 821                 if (size < data_offset + data_length)
 822                         {
 823                         printf("warning: exif tag %s data will overrun end of file, ignored.\n", marker->key);
 824                         return -1;
 825                         }
 826                 }
 827         else
 828                 {
 829                 data_offset = offset + EXIF_TIFD_OFFSET_DATA;
 830                 }
 831
 832         item = exif_item_new(marker->format, tag, count, marker);
 833         exif_item_copy_data(item, tiff + data_offset, data_length, format, bo);
 834         exif->items = g_list_prepend(exif->items, item);
 835
 836         if (list == ExifKnownMarkersList)
 837                 {
 838                 switch (item->tag)
 839                         {
 840                         case TAG_EXIFOFFSET:
 841                                 exif_parse_IFD_table(exif, tiff, data_val, size, bo, level + 1, list);
 842                                 break;
 843                         case TAG_EXIFMAKERNOTE:
 844                                 format_exif_makernote_parse(exif, tiff, data_val, size, bo);
 845                                 break;
 846                         }
 847                 }
 848
 849         return 0;
 850 }
 851
 852 gint exif_parse_IFD_table(ExifData *exif,
 853                           unsigned char *tiff, guint offset,
 854                           guint size, ExifByteOrder bo,
 855                           gint level,
 856                           const ExifMarker *list)
 857 {
 858         guint count;
 859         guint i;
 860
 861         /* limit damage from infinite loops */
 862         if (level > EXIF_TIFF_MAX_LEVELS) return -1;
 863
 864         /* We should be able to read number of entries in IFD0) */
 865         if (size < offset + 2) return -1;
 866
 867         count = exif_byte_get_int16(tiff + offset, bo);
 868         offset += 2;
 869
 870         /* Entries and next IFD offset must be readable */
 871         if (size < offset + count * EXIF_TIFD_SIZE + 4) return -1;
 872
 873         for (i = 0; i < count; i++)
 874                 {
 875                 exif_parse_IFD_entry(exif, tiff, offset + i * EXIF_TIFD_SIZE, size, bo, level, list);
 876                 }
 877
 878         return 0;
 879 }
 880
 881 /*
 882  *-------------------------------------------------------------------
 883  * file formats
 884  *-------------------------------------------------------------------
 885  */
 886
 887 gint exif_tiff_directory_offset(unsigned char *data, const guint len,
 888                                 guint *offset, ExifByteOrder *bo)
 889 {
 890         if (len < 8) return FALSE;
 891
 892         if (memcmp(data, "II", 2) == 0)
 893                 {
 894                 *bo = EXIF_BYTE_ORDER_INTEL;
 895                 }
 896         else if (memcmp(data, "MM", 2) == 0)
 897                 {
 898                 *bo = EXIF_BYTE_ORDER_MOTOROLA;
 899                 }
 900         else
 901                 {
 902                 return FALSE;
 903                 }
 904
 905         if (exif_byte_get_int16(data + 2, *bo) != 0x002A)
 906                 {
 907                 return FALSE;
 908                 }
 909
 910         *offset = exif_byte_get_int32(data + 4, *bo);
 911
 912         return (*offset < len);
 913 }
 914
 915 gint exif_tiff_parse(ExifData *exif, unsigned char *tiff, guint size, ExifMarker *list)
 916 {
 917         ExifByteOrder bo;
 918         guint offset;
 919
 920         if (!exif_tiff_directory_offset(tiff, size, &offset, &bo)) return -1;
 921
 922         return exif_parse_IFD_table(exif, tiff, offset, size, bo, 0, list);
 923 }
 924
 925 /*
 926  *-------------------------------------------------------------------
 927  * jpeg marker utils
 928  *-------------------------------------------------------------------
 929  */
 930
 931 #define MARKER_UNKNOWN          0x00
 932 #define MARKER_SOI              0xD8
 933 #define MARKER_APP1             0xE1
 934
 935 static gint jpeg_get_marker_size(unsigned char *data)
 936 {
 937         /* Size is always in Motorola byte order */
 938         return exif_byte_get_int16(data + 2, EXIF_BYTE_ORDER_MOTOROLA);
 939 }
 940
 941 static gint jpeg_goto_next_marker(unsigned char **data, gint *size, gint *marker)
 942 {
 943         gint marker_size = 2;
 944
 945         *marker = MARKER_UNKNOWN;
 946
 947         /* It is safe to access the marker and its size since we have checked
 948          * the SOI and this function guaranties the whole next marker is
 949          * available
 950          */
 951         if (*(*data + 1) != MARKER_SOI)
 952                 {
 953                 marker_size += jpeg_get_marker_size(*data);
 954                 }
 955
 956         *size -= marker_size;
 957
 958         /* size should be at least 4, so we can read the marker and its size
 959          * and check data are actually available
 960          */
 961         if (*size < 4) return -1;
 962
 963         /* Jump to the next marker and be sure it begins with 0xFF
 964          */
 965         *data += marker_size;
 966         if (**data != 0xFF) return -1;
 967
 968         if (jpeg_get_marker_size(*data) + 2 > *size) return -1;
 969
 970         *marker = *(*data + 1);
 971
 972         return 0;
 973 }
 974
 975
 976 static gint exif_parse_JPEG(ExifData *exif, unsigned char *data, guint size, ExifMarker *list)
 977 {
 978         guint marker;
 979         guint marker_size;
 980
 981         if (size < 4 || *data != 0xFF || *(data + 1) != MARKER_SOI)
 982                 {
 983                 return -2;
 984                 }
 985
 986         do {
 987                 if (jpeg_goto_next_marker(&data, &size, &marker) == -1)
 988                         {
 989                         break;
 990                         }
 991         } while (marker != MARKER_APP1);
 992
 993         if (marker != MARKER_APP1)
 994                 {
 995                 return -2;
 996                 }
 997
 998         marker_size = jpeg_get_marker_size(data) - 2;
 999
1000         if (marker_size < 6 || memcmp(data + 4, "Exif\x00\x00", 6) != 0)
1001                 {
1002                 return -2;
1003                 }
1004
1005         return exif_tiff_parse(exif, data + 10, marker_size - 6, list);
1006 }
1007
1008 /*
1009  *-------------------------------------------------------------------
1010  * misc
1011  *-------------------------------------------------------------------
1012  */
1013
1014 static gint map_file(const gchar *path, void **mapping, int *size)
1015 {
1016         int fd;
1017         struct stat fs;
1018
1019         if ((fd = open(path, O_RDONLY)) == -1)
1020                 {
1021                 perror(path);
1022                 return -1;
1023                 }
1024
1025         if (fstat(fd, &fs) == -1)
1026                 {
1027                 perror(path);
1028                 close(fd);
1029                 return -1;
1030                 }
1031
1032         *size = fs.st_size;
1033
1034         if ((*mapping = mmap(0, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0)) == MAP_FAILED)
1035                 {
1036                 perror(path);
1037                 close(fd);
1038                 return -1;
1039                 }
1040
1041         close(fd);
1042         return 0;
1043 }
1044
1045 static gint unmap_file(void *mapping, int size)
1046 {
1047         if (munmap(mapping, size) == -1)
1048                 {
1049                 perror("munmap");
1050                 return -1;
1051                 }
1052
1053         return 0;
1054 }
1055
1056 void exif_free(ExifData *exif)
1057 {
1058         GList *work;
1059
1060         if (!exif) return;
1061
1062         work = exif->items;
1063         while (work)
1064                 {
1065                 ExifItem *item = work->data;
1066                 work = work->next;
1067                 exif_item_free(item);
1068                 }
1069
1070         g_list_free(exif->items);
1071         g_free(exif);
1072 }
1073
1074 ExifData *exif_read(const gchar *path)
1075 {
1076         ExifData *exif;
1077         void *f;
1078         int size, res;
1079         gchar *pathl;
1080
1081         if (!path) return NULL;
1082
1083         pathl = path_from_utf8(path);
1084         if (map_file(pathl, &f, &size) == -1)
1085                 {
1086                 g_free(pathl);
1087                 return NULL;
1088                 }
1089         g_free(pathl);
1090
1091         exif = g_new0(ExifData, 1);
1092         exif->items = NULL;
1093
1094         if ((res = exif_parse_JPEG(exif, (unsigned char *)f, size, ExifKnownMarkersList)) == -2)
1095                 {
1096                 res = exif_tiff_parse(exif, (unsigned char *)f, size, ExifKnownMarkersList);
1097                 }
1098
1099         if (res != 0)
1100                 {
1101                 guint32 offset = 0;
1102
1103                 if (format_raw_img_exif_offsets(f, size, NULL, &offset))
1104                         {
1105                         res = exif_tiff_parse(exif, (unsigned char*)f + offset, size - offset, ExifKnownMarkersList);
1106                         }
1107                 }
1108
1109         if (res != 0)
1110                 {
1111                 exif_free(exif);
1112                 exif = NULL;
1113                 }
1114
1115         unmap_file(f, size);
1116
1117         if (exif) exif->items = g_list_reverse(exif->items);
1118
1119 #if 0
1120         exif_write_data_list(exif, stdout, TRUE);
1121         exif_write_data_list(exif, stdout, FALSE);
1122 #endif
1123
1124         return exif;
1125 }
1126
1127 ExifItem *exif_get_item(ExifData *exif, const gchar *key)
1128 {
1129         GList *work;
1130
1131         if (!key) return NULL;
1132
1133         work = exif->items;
1134         while (work)
1135                 {
1136                 ExifItem *item;
1137
1138                 item = work->data;
1139                 work = work->next;
1140                 if (item->marker->key && strcmp(key, item->marker->key) == 0) return item;
1141                 }
1142         return NULL;
1143 }
1144
1145 gchar *exif_item_get_data_as_text(ExifItem *item)
1146 {
1147         const ExifMarker *marker;
1148         gpointer data;
1149         GString *string;
1150         gchar *text;
1151         gint ne;
1152         gint i;
1153
1154         if (!item) return NULL;
1155
1156         marker = item->marker;
1157         if (!marker) return NULL;
1158
1159         data = item->data;
1160         ne = item->elements;
1161         string = g_string_new("");
1162         switch (item->format)
1163                 {
1164                 case EXIF_FORMAT_UNKNOWN:
1165                         break;
1166                 case EXIF_FORMAT_BYTE_UNSIGNED:
1167                 case EXIF_FORMAT_BYTE:
1168                 case EXIF_FORMAT_UNDEFINED:
1169                         if (ne == 1 && marker->list)
1170                                 {
1171                                 gchar *result;
1172                                 unsigned char val;
1173
1174                                 if (item->format == EXIF_FORMAT_BYTE_UNSIGNED ||
1175                                     item->format == EXIF_FORMAT_UNDEFINED)
1176                                         {
1177                                         val = ((unsigned char *)data)[0];
1178                                         }
1179                                 else
1180                                         {
1181                                         val = (unsigned char)(((signed char *)data)[0]);
1182                                         }
1183
1184                                 result = exif_text_list_find_value(marker->list, (guint)val);
1185                                 string = g_string_append(string, result);
1186                                 g_free(result);
1187                                 }
1188                         else
1189                                 {
1190                                 string = string_append_raw_bytes(string, data, ne);
1191                                 }
1192                         break;
1193                 case EXIF_FORMAT_STRING:
1194                         string = g_string_append(string, (gchar *)(item->data));
1195                         break;
1196                 case EXIF_FORMAT_SHORT_UNSIGNED:
1197                         if (ne == 1 && marker->list)
1198                                 {
1199                                 gchar *result;
1200
1201                                 result = exif_text_list_find_value(marker->list, ((unsigned short *)data)[0]);
1202                                 string = g_string_append(string, result);
1203                                 g_free(result);
1204                                 }
1205                         else for (i = 0; i < ne; i++)
1206                                 {
1207                                 g_string_append_printf(string, "%s%hd", (i > 0) ? ", " : "",
1208                                                         ((unsigned short *)data)[i]);
1209                                 }
1210                         break;
1211                 case EXIF_FORMAT_LONG_UNSIGNED:
1212                         for (i = 0; i < ne; i++)
1213                                 {
1214                                 g_string_append_printf(string, "%s%ld", (i > 0) ? ", " : "",
1215                                                         ((unsigned long *)data)[i]);
1216                                 }
1217                         break;
1218                 case EXIF_FORMAT_RATIONAL_UNSIGNED:
1219                         for (i = 0; i < ne; i++)
1220                                 {
1221                                 ExifRational *r;
1222
1223                                 r = &((ExifRational *)data)[i];
1224                                 g_string_append_printf(string, "%s%ld/%ld", (i > 0) ? ", " : "",
1225                                                         (unsigned long)r->num, (unsigned long)r->den);
1226                                 }
1227                         break;
1228                 case EXIF_FORMAT_SHORT:
1229                         for (i = 0; i < ne; i++)
1230                                 {
1231                                 g_string_append_printf(string, "%s%hd", (i > 0) ? ", " : "",
1232                                                         ((short *)data)[i]);
1233                                 }
1234                         break;
1235                 case EXIF_FORMAT_LONG:
1236                         for (i = 0; i < ne; i++)
1237                                 {
1238                                 g_string_append_printf(string, "%s%ld", (i > 0) ? ", " : "",
1239                                                         ((long *)data)[i]);
1240                                 }
1241                         break;
1242                 case EXIF_FORMAT_RATIONAL:
1243                         for (i = 0; i < ne; i++)
1244                                 {
1245                                 ExifRational *r;
1246
1247                                 r = &((ExifRational *)data)[i];
1248                                 g_string_append_printf(string, "%s%ld/%ld", (i > 0) ? ", " : "",
1249                                                         (long)r->num, (long)r->den);
1250                                 }
1251                         break;
1252                 case EXIF_FORMAT_FLOAT:
1253                         for (i = 0; i < ne; i++)
1254                                 {
1255                                 g_string_append_printf(string, "%s%f", (i > 0) ? ", " : "",
1256                                                         ((float *)data)[i]);
1257                                 }
1258                         break;
1259                 case EXIF_FORMAT_DOUBLE:
1260                         for (i = 0; i < ne; i++)
1261                                 {
1262                                 g_string_append_printf(string, "%s%f", (i > 0) ? ", " : "",
1263                                                         ((double *)data)[i]);
1264                                 }
1265                         break;
1266                 }
1267
1268         text = g_strdup(string->str);
1269         g_string_free(string, TRUE);
1270
1271         return text;
1272 }
1273
1274 gint exif_item_get_integer(ExifItem *item, gint *value)
1275 {
1276         if (!item) return FALSE;
1277
1278         switch (item->format)
1279                 {
1280                 case EXIF_FORMAT_SHORT:
1281                         *value = (gint)(((short *)(item->data))[0]);
1282                         return TRUE;
1283                         break;
1284                 case EXIF_FORMAT_SHORT_UNSIGNED:
1285                         *value = (gint)(((unsigned short *)(item->data))[0]);
1286                         return TRUE;
1287                         break;
1288                 case EXIF_FORMAT_LONG:
1289                         *value = (gint)(((long *)(item->data))[0]);
1290                         return TRUE;
1291                         break;
1292                 case EXIF_FORMAT_LONG_UNSIGNED:
1293                         /* FIXME: overflow possible */
1294                         *value = (gint)(((unsigned long *)(item->data))[0]);
1295                         return TRUE;
1296                 default:
1297                         /* all other type return FALSE */
1298                         break;
1299                 }
1300         return FALSE;
1301 }
1302
1303 gint exif_get_integer(ExifData *exif, const gchar *key, gint *value)
1304 {
1305         ExifItem *item;
1306
1307         item = exif_get_item(exif, key);
1308         return exif_item_get_integer(item, value);
1309 }
1310
1311 ExifRational *exif_item_get_rational(ExifItem *item, gint *sign)
1312 {
1313         if (!item) return NULL;
1314
1315         if (item->format == EXIF_FORMAT_RATIONAL ||
1316             item->format == EXIF_FORMAT_RATIONAL_UNSIGNED)
1317                 {
1318                 if (sign) *sign = (item->format == EXIF_FORMAT_RATIONAL);
1319                 return &((ExifRational *)(item->data))[0];
1320                 }
1321
1322         return NULL;
1323 }
1324
1325 ExifRational *exif_get_rational(ExifData *exif, const gchar *key, gint *sign)
1326 {
1327         ExifItem *item;
1328
1329         item = exif_get_item(exif, key);
1330         return exif_item_get_rational(item, sign);
1331 }
1332
1333 double exif_rational_to_double(ExifRational *r, gint sign)
1334 {
1335         if (!r || r->den == 0.0) return 0.0;
1336
1337         if (sign) return (double)((int)r->num) / (double)((int)r->den);
1338         return (double)r->num / r->den;
1339 }
1340
1341 static double exif_get_rational_as_double(ExifData *exif, const gchar *key)
1342 {
1343         ExifRational *r;
1344         gint sign;
1345
1346         r = exif_get_rational(exif, key, &sign);
1347         return exif_rational_to_double(r, sign);
1348 }
1349
1350 static GString *append_comma_text(GString *string, const gchar *text)
1351 {
1352         string = g_string_append(string, ", ");
1353         string = g_string_append(string, text);
1354
1355         return string;
1356 }
1357
1358 static gchar *exif_get_formatted_by_key(ExifData *exif, const gchar *key, gint *key_valid)
1359 {
1360         /* must begin with f, else not formatted */
1361         if (key[0] != 'f')
1362                 {
1363                 if (key_valid) *key_valid = FALSE;
1364                 return NULL;
1365                 }
1366
1367         if (key_valid) *key_valid = TRUE;
1368
1369         if (strcmp(key, "fCamera") == 0)
1370                 {
1371                 gchar *text;
1372                 gchar *make = exif_get_data_as_text(exif, "Make");
1373                 gchar *model = exif_get_data_as_text(exif, "Model");
1374                 gchar *software = exif_get_data_as_text(exif, "Software");
1375
1376                 text = g_strdup_printf("%s%s%s%s%s%s", (make) ? make : "", ((make) && (model)) ? " " : "",
1377                                                        (model) ? model : "",
1378                                                        (software) ? " (" : "",
1379                                                        (software) ? software : "",
1380                                                        (software) ? ")" : "");
1381
1382                 g_free(make);
1383                 g_free(model);
1384                 g_free(software);
1385                 return text;
1386                 }
1387         if (strcmp(key, "fDateTime") == 0)
1388                 {
1389                 gchar *text = exif_get_data_as_text(exif, "DateTimeOriginal");
1390                 gchar *subsec = NULL;
1391                 if (text) subsec = exif_get_data_as_text(exif, "SubsecTimeOriginal");
1392                 if (!text)
1393                         {
1394                         text = exif_get_data_as_text(exif, "DateTime");
1395                         if (text) subsec = exif_get_data_as_text(exif, "SubsecTime");
1396                         }
1397                 if (subsec)
1398                         {
1399                         gchar *tmp = text;
1400                         text = g_strconcat(tmp, ".", subsec, NULL);
1401                         g_free(tmp);
1402                         g_free(subsec);
1403                         }
1404                 return text;
1405                 }
1406         if (strcmp(key, "fShutterSpeed") == 0)
1407                 {
1408                 ExifRational *r;
1409
1410                 r = exif_get_rational(exif, "ExposureTime", NULL);
1411                 if (r && r->num && r->den)
1412                         {
1413                         double n = (double)r->den / (double)r->num;
1414                         return g_strdup_printf("%s%.0fs", n > 1.0 ? "1/" : "",
1415                                                           n > 1.0 ? n : 1.0 / n);
1416                         }
1417                 r = exif_get_rational(exif, "ShutterSpeedValue", NULL);
1418                 if (r && r->num  && r->den)
1419                         {
1420                         double n = pow(2.0, exif_rational_to_double(r, TRUE));
1421
1422                         /* Correct exposure time to avoid values like 1/91s (seen on Minolta DImage 7) */
1423                         if (n > 1.0 && (int)n - ((int)(n/10))*10 == 1) n--;
1424
1425                         return g_strdup_printf("%s%.0fs", n > 1.0 ? "1/" : "",
1426                                                           n > 1.0 ? floor(n) : 1.0 / n);
1427                         }
1428                 return NULL;
1429                 }
1430         if (strcmp(key, "fAperture") == 0)
1431                 {
1432                 double n;
1433
1434                 n = exif_get_rational_as_double(exif, "FNumber");
1435                 if (n == 0.0) n = exif_get_rational_as_double(exif, "ApertureValue");
1436                 if (n == 0.0) return NULL;
1437
1438                 return g_strdup_printf("f/%.1f", n);
1439                 }
1440         if (strcmp(key, "fExposureBias") == 0)
1441                 {
1442                 ExifRational *r;
1443                 gint sign;
1444                 double n;
1445
1446                 r = exif_get_rational(exif, "ExposureBiasValue", &sign);
1447                 if (!r) return NULL;
1448
1449                 n = exif_rational_to_double(r, sign);
1450                 return g_strdup_printf("%+.1f", n);
1451                 }
1452         if (strcmp(key, "fFocalLength") == 0)
1453                 {
1454                 double n;
1455
1456                 n = exif_get_rational_as_double(exif, "FocalLength");
1457                 if (n == 0.0) return NULL;
1458                 return g_strdup_printf("%.2f mm", n);
1459                 }
1460         if (strcmp(key, "fISOSpeedRating") == 0)
1461                 {
1462                 gchar *text;
1463
1464                 text = exif_get_data_as_text(exif, "ISOSpeedRatings");
1465                 /* kodak may set this instead */
1466                 if (!text) text = exif_get_data_as_text(exif, "ExposureIndex");
1467                 return text;
1468                 }
1469         if (strcmp(key, "fSubjectDistance") == 0)
1470                 {
1471                 ExifRational *r;
1472                 gint sign;
1473                 double n;
1474
1475                 r = exif_get_rational(exif, "SubjectDistance", &sign);
1476                 if (!r) return NULL;
1477
1478                 if ((long)r->num == 0xffffffff) return g_strdup(_("infinity"));
1479                 if ((long)r->num == 0) return g_strdup(_("unknown"));
1480
1481                 n = exif_rational_to_double(r, sign);
1482                 if (n == 0.0) return _("unknown");
1483                 return g_strdup_printf("%.3f m", n);
1484                 }
1485         if (strcmp(key, "fFlash") == 0)
1486                 {
1487                 /* grr, flash is a bitmask... */
1488                 GString *string;
1489                 gchar *text;
1490                 gint n;
1491                 gint v;
1492
1493                 if (!exif_get_integer(exif, "Flash", &n)) return NULL;
1494
1495                 /* Exif 2.1 only defines first 3 bits */
1496                 if (n <= 0x07) return g_strdup(exif_text_list_find_value(ExifFlashList, n));
1497
1498                 /* must be Exif 2.2 */
1499                 string = g_string_new("");
1500
1501                 /* flash fired (bit 0) */
1502                 string = g_string_append(string, (n & 0x01) ? _("yes") : _("no"));
1503
1504                 /* flash mode (bits 3, 4) */
1505                 v = (n >> 3) & 0x03;
1506                 if (v) string = append_comma_text(string, _("mode:"));
1507                 switch (v)
1508                         {
1509                         case 1:
1510                                 string = g_string_append(string, _("on"));
1511                                 break;
1512                         case 2:
1513                                 string = g_string_append(string, _("off"));
1514                                 break;
1515                         case 3:
1516                                 string = g_string_append(string, _("auto"));
1517                                 break;
1518                         }
1519
1520                 /* return light (bits 1, 2) */
1521                 v = (n >> 1) & 0x03;
1522                 if (v == 2) string = append_comma_text(string, _("not detected by strobe"));
1523                 if (v == 3) string = append_comma_text(string, _("detected by strobe"));
1524
1525                 /* we ignore flash function (bit 5) */
1526
1527                 /* red-eye (bit 6) */
1528                 if ((n >> 5) & 0x01) string = append_comma_text(string, _("red-eye reduction"));
1529
1530                 text = string->str;
1531                 g_string_free(string, FALSE);
1532                 return text;
1533                 }
1534         if (strcmp(key, "fResolution") == 0)
1535                 {
1536                 ExifRational *rx, *ry;
1537                 gchar *units;
1538                 gchar *text;
1539
1540                 rx = exif_get_rational(exif, "XResolution", NULL);
1541                 ry = exif_get_rational(exif, "YResolution", NULL);
1542                 if (!rx || !ry) return NULL;
1543
1544                 units = exif_get_data_as_text(exif, "ResolutionUnit");
1545                 text = g_strdup_printf("%0.f x %0.f (%s/%s)", rx->den ? (double)rx->num / rx->den : 1.0,
1546                                                               ry->den ? (double)ry->num / ry->den : 1.0,
1547                                                               _("dot"), (units) ? units : _("unknown"));
1548
1549                 g_free(units);
1550                 return text;
1551                 }
1552
1553         if (key_valid) *key_valid = FALSE;
1554         return NULL;
1555 }
1556
1557 gchar *exif_get_data_as_text(ExifData *exif, const gchar *key)
1558 {
1559         ExifItem *item;
1560         gchar *text;
1561         gint key_valid;
1562
1563         if (!key) return NULL;
1564
1565         text = exif_get_formatted_by_key(exif, key, &key_valid);
1566         if (key_valid) return text;
1567
1568         item = exif_get_item(exif, key);
1569         if (item) return exif_item_get_data_as_text(item);
1570
1571         return NULL;
1572 }
1573
1574 const gchar *exif_get_description_by_key(const gchar *key)
1575 {
1576         gint i;
1577
1578         if (!key) return NULL;
1579
1580         i = 0;
1581         while (ExifFormattedList[i].key != NULL)
1582                 {
1583                 if (strcmp(key, ExifFormattedList[i].key) == 0) return _(ExifFormattedList[i].description);
1584                 i++;
1585                 }
1586
1587         i = 0;
1588         while (ExifKnownMarkersList[i].tag > 0)
1589                 {
1590                 if (strcmp(key, ExifKnownMarkersList[i].key) == 0) return _(ExifKnownMarkersList[i].description);
1591                 i++;
1592                 }
1593
1594         return NULL;
1595 }
1596
1597 static void exif_write_item(FILE *f, ExifItem *item)
1598 {
1599         gchar *text;
1600
1601         text = exif_item_get_data_as_text(item);
1602         if (text)
1603                 {
1604                 fprintf(f, "%4x %9s %30s %s\n", item->tag, ExifFormatList[item->format].short_name,
1605                         exif_item_get_tag_name(item), text);
1606                 }
1607         g_free(text);
1608 }
1609
1610 void exif_write_data_list(ExifData *exif, FILE *f, gint human_readable_list)
1611 {
1612         if (!f || !exif) return;
1613
1614         fprintf(f, " tag   format                             key value\n");
1615         fprintf(f, "----------------------------------------------------\n");
1616
1617         if (human_readable_list)
1618                 {
1619                 gint i;
1620
1621                 i = 0;
1622                 while (ExifFormattedList[i].key)
1623                         {
1624                         gchar *text;
1625
1626                         text = exif_get_formatted_by_key(exif, ExifFormattedList[i].key, NULL);
1627                         if (text)
1628                                 {
1629                                 fprintf(f, "     %9s %30s %s\n", "string", ExifFormattedList[i].key, text);
1630                                 }
1631                         i++;
1632                         }
1633                 }
1634         else
1635                 {
1636                 GList *work;
1637
1638                 work = exif->items;
1639                 while (work)
1640                         {
1641                         ExifItem *item;
1642
1643                         item = work->data;
1644                         work = work->next;
1645
1646                         exif_write_item(f, item);
1647                         }
1648                 }
1649         fprintf(f, "----------------------------------------------------\n");
1650 }
1651