1060 lines
40 KiB
JavaScript
Executable File
1060 lines
40 KiB
JavaScript
Executable File
(function() {
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var debug = false;
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var root = this;
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var EXIF = function(obj) {
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if (obj instanceof EXIF) return obj;
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if (!(this instanceof EXIF)) return new EXIF(obj);
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this.EXIFwrapped = obj;
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};
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if (typeof exports !== 'undefined') {
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if (typeof module !== 'undefined' && module.exports) {
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exports = module.exports = EXIF;
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}
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exports.EXIF = EXIF;
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} else {
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root.EXIF = EXIF;
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}
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var ExifTags = EXIF.Tags = {
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// version tags
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0x9000 : "ExifVersion", // EXIF version
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0xA000 : "FlashpixVersion", // Flashpix format version
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// colorspace tags
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0xA001 : "ColorSpace", // Color space information tag
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// image configuration
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0xA002 : "PixelXDimension", // Valid width of meaningful image
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0xA003 : "PixelYDimension", // Valid height of meaningful image
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0x9101 : "ComponentsConfiguration", // Information about channels
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0x9102 : "CompressedBitsPerPixel", // Compressed bits per pixel
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// user information
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0x927C : "MakerNote", // Any desired information written by the manufacturer
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0x9286 : "UserComment", // Comments by user
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// related file
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0xA004 : "RelatedSoundFile", // Name of related sound file
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// date and time
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0x9003 : "DateTimeOriginal", // Date and time when the original image was generated
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0x9004 : "DateTimeDigitized", // Date and time when the image was stored digitally
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0x9290 : "SubsecTime", // Fractions of seconds for DateTime
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0x9291 : "SubsecTimeOriginal", // Fractions of seconds for DateTimeOriginal
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0x9292 : "SubsecTimeDigitized", // Fractions of seconds for DateTimeDigitized
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// picture-taking conditions
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0x829A : "ExposureTime", // Exposure time (in seconds)
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0x829D : "FNumber", // F number
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0x8822 : "ExposureProgram", // Exposure program
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0x8824 : "SpectralSensitivity", // Spectral sensitivity
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0x8827 : "ISOSpeedRatings", // ISO speed rating
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0x8828 : "OECF", // Optoelectric conversion factor
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0x9201 : "ShutterSpeedValue", // Shutter speed
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0x9202 : "ApertureValue", // Lens aperture
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0x9203 : "BrightnessValue", // Value of brightness
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0x9204 : "ExposureBias", // Exposure bias
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0x9205 : "MaxApertureValue", // Smallest F number of lens
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0x9206 : "SubjectDistance", // Distance to subject in meters
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0x9207 : "MeteringMode", // Metering mode
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0x9208 : "LightSource", // Kind of light source
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0x9209 : "Flash", // Flash status
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0x9214 : "SubjectArea", // Location and area of main subject
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0x920A : "FocalLength", // Focal length of the lens in mm
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0xA20B : "FlashEnergy", // Strobe energy in BCPS
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0xA20C : "SpatialFrequencyResponse", //
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0xA20E : "FocalPlaneXResolution", // Number of pixels in width direction per FocalPlaneResolutionUnit
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0xA20F : "FocalPlaneYResolution", // Number of pixels in height direction per FocalPlaneResolutionUnit
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0xA210 : "FocalPlaneResolutionUnit", // Unit for measuring FocalPlaneXResolution and FocalPlaneYResolution
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0xA214 : "SubjectLocation", // Location of subject in image
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0xA215 : "ExposureIndex", // Exposure index selected on camera
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0xA217 : "SensingMethod", // Image sensor type
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0xA300 : "FileSource", // Image source (3 == DSC)
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0xA301 : "SceneType", // Scene type (1 == directly photographed)
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0xA302 : "CFAPattern", // Color filter array geometric pattern
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0xA401 : "CustomRendered", // Special processing
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0xA402 : "ExposureMode", // Exposure mode
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0xA403 : "WhiteBalance", // 1 = auto white balance, 2 = manual
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0xA404 : "DigitalZoomRation", // Digital zoom ratio
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0xA405 : "FocalLengthIn35mmFilm", // Equivalent foacl length assuming 35mm film camera (in mm)
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0xA406 : "SceneCaptureType", // Type of scene
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0xA407 : "GainControl", // Degree of overall image gain adjustment
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0xA408 : "Contrast", // Direction of contrast processing applied by camera
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0xA409 : "Saturation", // Direction of saturation processing applied by camera
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0xA40A : "Sharpness", // Direction of sharpness processing applied by camera
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0xA40B : "DeviceSettingDescription", //
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0xA40C : "SubjectDistanceRange", // Distance to subject
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// other tags
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0xA005 : "InteroperabilityIFDPointer",
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0xA420 : "ImageUniqueID" // Identifier assigned uniquely to each image
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};
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var TiffTags = EXIF.TiffTags = {
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0x0100 : "ImageWidth",
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0x0101 : "ImageHeight",
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0x8769 : "ExifIFDPointer",
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0x8825 : "GPSInfoIFDPointer",
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0xA005 : "InteroperabilityIFDPointer",
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0x0102 : "BitsPerSample",
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0x0103 : "Compression",
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0x0106 : "PhotometricInterpretation",
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0x0112 : "Orientation",
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0x0115 : "SamplesPerPixel",
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0x011C : "PlanarConfiguration",
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0x0212 : "YCbCrSubSampling",
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0x0213 : "YCbCrPositioning",
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0x011A : "XResolution",
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0x011B : "YResolution",
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0x0128 : "ResolutionUnit",
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0x0111 : "StripOffsets",
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0x0116 : "RowsPerStrip",
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0x0117 : "StripByteCounts",
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0x0201 : "JPEGInterchangeFormat",
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0x0202 : "JPEGInterchangeFormatLength",
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0x012D : "TransferFunction",
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0x013E : "WhitePoint",
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0x013F : "PrimaryChromaticities",
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0x0211 : "YCbCrCoefficients",
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0x0214 : "ReferenceBlackWhite",
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0x0132 : "DateTime",
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0x010E : "ImageDescription",
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0x010F : "Make",
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0x0110 : "Model",
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0x0131 : "Software",
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0x013B : "Artist",
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0x8298 : "Copyright"
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};
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var GPSTags = EXIF.GPSTags = {
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0x0000 : "GPSVersionID",
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0x0001 : "GPSLatitudeRef",
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0x0002 : "GPSLatitude",
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0x0003 : "GPSLongitudeRef",
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0x0004 : "GPSLongitude",
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0x0005 : "GPSAltitudeRef",
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0x0006 : "GPSAltitude",
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0x0007 : "GPSTimeStamp",
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0x0008 : "GPSSatellites",
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0x0009 : "GPSStatus",
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0x000A : "GPSMeasureMode",
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0x000B : "GPSDOP",
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0x000C : "GPSSpeedRef",
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0x000D : "GPSSpeed",
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0x000E : "GPSTrackRef",
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0x000F : "GPSTrack",
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0x0010 : "GPSImgDirectionRef",
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0x0011 : "GPSImgDirection",
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0x0012 : "GPSMapDatum",
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0x0013 : "GPSDestLatitudeRef",
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0x0014 : "GPSDestLatitude",
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0x0015 : "GPSDestLongitudeRef",
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0x0016 : "GPSDestLongitude",
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0x0017 : "GPSDestBearingRef",
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0x0018 : "GPSDestBearing",
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0x0019 : "GPSDestDistanceRef",
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0x001A : "GPSDestDistance",
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0x001B : "GPSProcessingMethod",
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0x001C : "GPSAreaInformation",
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0x001D : "GPSDateStamp",
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0x001E : "GPSDifferential"
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};
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// EXIF 2.3 Spec
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var IFD1Tags = EXIF.IFD1Tags = {
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0x0100: "ImageWidth",
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0x0101: "ImageHeight",
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0x0102: "BitsPerSample",
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0x0103: "Compression",
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0x0106: "PhotometricInterpretation",
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0x0111: "StripOffsets",
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0x0112: "Orientation",
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0x0115: "SamplesPerPixel",
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0x0116: "RowsPerStrip",
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0x0117: "StripByteCounts",
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0x011A: "XResolution",
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0x011B: "YResolution",
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0x011C: "PlanarConfiguration",
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0x0128: "ResolutionUnit",
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0x0201: "JpegIFOffset", // When image format is JPEG, this value show offset to JPEG data stored.(aka "ThumbnailOffset" or "JPEGInterchangeFormat")
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0x0202: "JpegIFByteCount", // When image format is JPEG, this value shows data size of JPEG image (aka "ThumbnailLength" or "JPEGInterchangeFormatLength")
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0x0211: "YCbCrCoefficients",
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0x0212: "YCbCrSubSampling",
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0x0213: "YCbCrPositioning",
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0x0214: "ReferenceBlackWhite"
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};
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var StringValues = EXIF.StringValues = {
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ExposureProgram : {
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0 : "Not defined",
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1 : "Manual",
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2 : "Normal program",
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3 : "Aperture priority",
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4 : "Shutter priority",
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5 : "Creative program",
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6 : "Action program",
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7 : "Portrait mode",
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8 : "Landscape mode"
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},
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MeteringMode : {
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0 : "Unknown",
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1 : "Average",
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2 : "CenterWeightedAverage",
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3 : "Spot",
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4 : "MultiSpot",
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5 : "Pattern",
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6 : "Partial",
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255 : "Other"
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},
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LightSource : {
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0 : "Unknown",
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1 : "Daylight",
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2 : "Fluorescent",
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3 : "Tungsten (incandescent light)",
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4 : "Flash",
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9 : "Fine weather",
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10 : "Cloudy weather",
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11 : "Shade",
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12 : "Daylight fluorescent (D 5700 - 7100K)",
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13 : "Day white fluorescent (N 4600 - 5400K)",
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14 : "Cool white fluorescent (W 3900 - 4500K)",
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15 : "White fluorescent (WW 3200 - 3700K)",
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17 : "Standard light A",
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18 : "Standard light B",
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19 : "Standard light C",
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20 : "D55",
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21 : "D65",
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22 : "D75",
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23 : "D50",
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24 : "ISO studio tungsten",
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255 : "Other"
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},
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Flash : {
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0x0000 : "Flash did not fire",
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0x0001 : "Flash fired",
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0x0005 : "Strobe return light not detected",
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0x0007 : "Strobe return light detected",
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0x0009 : "Flash fired, compulsory flash mode",
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0x000D : "Flash fired, compulsory flash mode, return light not detected",
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0x000F : "Flash fired, compulsory flash mode, return light detected",
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0x0010 : "Flash did not fire, compulsory flash mode",
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0x0018 : "Flash did not fire, auto mode",
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0x0019 : "Flash fired, auto mode",
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0x001D : "Flash fired, auto mode, return light not detected",
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0x001F : "Flash fired, auto mode, return light detected",
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0x0020 : "No flash function",
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0x0041 : "Flash fired, red-eye reduction mode",
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0x0045 : "Flash fired, red-eye reduction mode, return light not detected",
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0x0047 : "Flash fired, red-eye reduction mode, return light detected",
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0x0049 : "Flash fired, compulsory flash mode, red-eye reduction mode",
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0x004D : "Flash fired, compulsory flash mode, red-eye reduction mode, return light not detected",
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0x004F : "Flash fired, compulsory flash mode, red-eye reduction mode, return light detected",
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0x0059 : "Flash fired, auto mode, red-eye reduction mode",
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0x005D : "Flash fired, auto mode, return light not detected, red-eye reduction mode",
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0x005F : "Flash fired, auto mode, return light detected, red-eye reduction mode"
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},
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SensingMethod : {
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1 : "Not defined",
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2 : "One-chip color area sensor",
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3 : "Two-chip color area sensor",
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4 : "Three-chip color area sensor",
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5 : "Color sequential area sensor",
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7 : "Trilinear sensor",
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8 : "Color sequential linear sensor"
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},
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SceneCaptureType : {
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0 : "Standard",
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1 : "Landscape",
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2 : "Portrait",
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3 : "Night scene"
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},
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SceneType : {
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1 : "Directly photographed"
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},
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CustomRendered : {
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0 : "Normal process",
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1 : "Custom process"
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},
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WhiteBalance : {
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0 : "Auto white balance",
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1 : "Manual white balance"
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},
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GainControl : {
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0 : "None",
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1 : "Low gain up",
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2 : "High gain up",
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3 : "Low gain down",
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4 : "High gain down"
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},
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Contrast : {
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0 : "Normal",
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1 : "Soft",
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2 : "Hard"
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},
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Saturation : {
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0 : "Normal",
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1 : "Low saturation",
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2 : "High saturation"
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},
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Sharpness : {
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0 : "Normal",
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1 : "Soft",
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2 : "Hard"
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},
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SubjectDistanceRange : {
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0 : "Unknown",
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1 : "Macro",
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2 : "Close view",
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3 : "Distant view"
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},
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FileSource : {
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3 : "DSC"
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},
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Components : {
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0 : "",
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1 : "Y",
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2 : "Cb",
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3 : "Cr",
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4 : "R",
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5 : "G",
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6 : "B"
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}
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};
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function addEvent(element, event, handler) {
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if (element.addEventListener) {
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element.addEventListener(event, handler, false);
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} else if (element.attachEvent) {
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element.attachEvent("on" + event, handler);
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}
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}
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function imageHasData(img) {
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return !!(img.exifdata);
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}
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function base64ToArrayBuffer(base64, contentType) {
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contentType = contentType || base64.match(/^data\:([^\;]+)\;base64,/mi)[1] || ''; // e.g. 'data:image/jpeg;base64,...' => 'image/jpeg'
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base64 = base64.replace(/^data\:([^\;]+)\;base64,/gmi, '');
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var binary = atob(base64);
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var len = binary.length;
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var buffer = new ArrayBuffer(len);
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var view = new Uint8Array(buffer);
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for (var i = 0; i < len; i++) {
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view[i] = binary.charCodeAt(i);
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}
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return buffer;
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}
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function objectURLToBlob(url, callback) {
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var http = new XMLHttpRequest();
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http.open("GET", url, true);
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http.responseType = "blob";
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http.onload = function(e) {
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if (this.status == 200 || this.status === 0) {
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callback(this.response);
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}
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};
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http.send();
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}
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function getImageData(img, callback) {
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function handleBinaryFile(binFile) {
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var data = findEXIFinJPEG(binFile);
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img.exifdata = data || {};
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var iptcdata = findIPTCinJPEG(binFile);
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img.iptcdata = iptcdata || {};
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if (EXIF.isXmpEnabled) {
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var xmpdata= findXMPinJPEG(binFile);
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img.xmpdata = xmpdata || {};
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}
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if (callback) {
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callback.call(img);
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}
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}
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if (img.src) {
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if (/^data\:/i.test(img.src)) { // Data URI
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var arrayBuffer = base64ToArrayBuffer(img.src);
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handleBinaryFile(arrayBuffer);
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} else if (/^blob\:/i.test(img.src)) { // Object URL
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var fileReader = new FileReader();
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fileReader.onload = function(e) {
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handleBinaryFile(e.target.result);
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};
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objectURLToBlob(img.src, function (blob) {
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fileReader.readAsArrayBuffer(blob);
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});
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} else {
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var http = new XMLHttpRequest();
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http.onload = function() {
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if (this.status == 200 || this.status === 0) {
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handleBinaryFile(http.response);
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} else {
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throw "Could not load image";
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}
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http = null;
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};
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http.open("GET", img.src, true);
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http.responseType = "arraybuffer";
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http.send(null);
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}
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} else if (self.FileReader && (img instanceof self.Blob || img instanceof self.File)) {
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var fileReader = new FileReader();
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fileReader.onload = function(e) {
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if (debug) console.log("Got file of length " + e.target.result.byteLength);
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handleBinaryFile(e.target.result);
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};
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fileReader.readAsArrayBuffer(img);
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}
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}
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function findEXIFinJPEG(file) {
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var dataView = new DataView(file);
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if (debug) console.log("Got file of length " + file.byteLength);
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if ((dataView.getUint8(0) != 0xFF) || (dataView.getUint8(1) != 0xD8)) {
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if (debug) console.log("Not a valid JPEG");
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return false; // not a valid jpeg
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}
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var offset = 2,
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length = file.byteLength,
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marker;
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while (offset < length) {
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if (dataView.getUint8(offset) != 0xFF) {
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if (debug) console.log("Not a valid marker at offset " + offset + ", found: " + dataView.getUint8(offset));
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return false; // not a valid marker, something is wrong
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}
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marker = dataView.getUint8(offset + 1);
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if (debug) console.log(marker);
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// we could implement handling for other markers here,
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// but we're only looking for 0xFFE1 for EXIF data
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if (marker == 225) {
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if (debug) console.log("Found 0xFFE1 marker");
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return readEXIFData(dataView, offset + 4, dataView.getUint16(offset + 2) - 2);
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// offset += 2 + file.getShortAt(offset+2, true);
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} else {
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offset += 2 + dataView.getUint16(offset+2);
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}
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}
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}
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function findIPTCinJPEG(file) {
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var dataView = new DataView(file);
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if (debug) console.log("Got file of length " + file.byteLength);
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if ((dataView.getUint8(0) != 0xFF) || (dataView.getUint8(1) != 0xD8)) {
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if (debug) console.log("Not a valid JPEG");
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return false; // not a valid jpeg
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}
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var offset = 2,
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length = file.byteLength;
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var isFieldSegmentStart = function(dataView, offset){
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return (
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dataView.getUint8(offset) === 0x38 &&
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dataView.getUint8(offset+1) === 0x42 &&
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dataView.getUint8(offset+2) === 0x49 &&
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dataView.getUint8(offset+3) === 0x4D &&
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dataView.getUint8(offset+4) === 0x04 &&
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dataView.getUint8(offset+5) === 0x04
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);
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};
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while (offset < length) {
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if ( isFieldSegmentStart(dataView, offset )){
|
|
|
|
// Get the length of the name header (which is padded to an even number of bytes)
|
|
var nameHeaderLength = dataView.getUint8(offset+7);
|
|
if(nameHeaderLength % 2 !== 0) nameHeaderLength += 1;
|
|
// Check for pre photoshop 6 format
|
|
if(nameHeaderLength === 0) {
|
|
// Always 4
|
|
nameHeaderLength = 4;
|
|
}
|
|
|
|
var startOffset = offset + 8 + nameHeaderLength;
|
|
var sectionLength = dataView.getUint16(offset + 6 + nameHeaderLength);
|
|
|
|
return readIPTCData(file, startOffset, sectionLength);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
// Not the marker, continue searching
|
|
offset++;
|
|
|
|
}
|
|
|
|
}
|
|
var IptcFieldMap = {
|
|
0x78 : 'caption',
|
|
0x6E : 'credit',
|
|
0x19 : 'keywords',
|
|
0x37 : 'dateCreated',
|
|
0x50 : 'byline',
|
|
0x55 : 'bylineTitle',
|
|
0x7A : 'captionWriter',
|
|
0x69 : 'headline',
|
|
0x74 : 'copyright',
|
|
0x0F : 'category'
|
|
};
|
|
function readIPTCData(file, startOffset, sectionLength){
|
|
var dataView = new DataView(file);
|
|
var data = {};
|
|
var fieldValue, fieldName, dataSize, segmentType, segmentSize;
|
|
var segmentStartPos = startOffset;
|
|
while(segmentStartPos < startOffset+sectionLength) {
|
|
if(dataView.getUint8(segmentStartPos) === 0x1C && dataView.getUint8(segmentStartPos+1) === 0x02){
|
|
segmentType = dataView.getUint8(segmentStartPos+2);
|
|
if(segmentType in IptcFieldMap) {
|
|
dataSize = dataView.getInt16(segmentStartPos+3);
|
|
segmentSize = dataSize + 5;
|
|
fieldName = IptcFieldMap[segmentType];
|
|
fieldValue = getStringFromDB(dataView, segmentStartPos+5, dataSize);
|
|
// Check if we already stored a value with this name
|
|
if(data.hasOwnProperty(fieldName)) {
|
|
// Value already stored with this name, create multivalue field
|
|
if(data[fieldName] instanceof Array) {
|
|
data[fieldName].push(fieldValue);
|
|
}
|
|
else {
|
|
data[fieldName] = [data[fieldName], fieldValue];
|
|
}
|
|
}
|
|
else {
|
|
data[fieldName] = fieldValue;
|
|
}
|
|
}
|
|
|
|
}
|
|
segmentStartPos++;
|
|
}
|
|
return data;
|
|
}
|
|
|
|
|
|
|
|
function readTags(file, tiffStart, dirStart, strings, bigEnd) {
|
|
var entries = file.getUint16(dirStart, !bigEnd),
|
|
tags = {},
|
|
entryOffset, tag,
|
|
i;
|
|
|
|
for (i=0;i<entries;i++) {
|
|
entryOffset = dirStart + i*12 + 2;
|
|
tag = strings[file.getUint16(entryOffset, !bigEnd)];
|
|
if (!tag && debug) console.log("Unknown tag: " + file.getUint16(entryOffset, !bigEnd));
|
|
tags[tag] = readTagValue(file, entryOffset, tiffStart, dirStart, bigEnd);
|
|
}
|
|
return tags;
|
|
}
|
|
|
|
|
|
function readTagValue(file, entryOffset, tiffStart, dirStart, bigEnd) {
|
|
var type = file.getUint16(entryOffset+2, !bigEnd),
|
|
numValues = file.getUint32(entryOffset+4, !bigEnd),
|
|
valueOffset = file.getUint32(entryOffset+8, !bigEnd) + tiffStart,
|
|
offset,
|
|
vals, val, n,
|
|
numerator, denominator;
|
|
|
|
switch (type) {
|
|
case 1: // byte, 8-bit unsigned int
|
|
case 7: // undefined, 8-bit byte, value depending on field
|
|
if (numValues == 1) {
|
|
return file.getUint8(entryOffset + 8, !bigEnd);
|
|
} else {
|
|
offset = numValues > 4 ? valueOffset : (entryOffset + 8);
|
|
vals = [];
|
|
for (n=0;n<numValues;n++) {
|
|
vals[n] = file.getUint8(offset + n);
|
|
}
|
|
return vals;
|
|
}
|
|
|
|
case 2: // ascii, 8-bit byte
|
|
offset = numValues > 4 ? valueOffset : (entryOffset + 8);
|
|
return getStringFromDB(file, offset, numValues-1);
|
|
|
|
case 3: // short, 16 bit int
|
|
if (numValues == 1) {
|
|
return file.getUint16(entryOffset + 8, !bigEnd);
|
|
} else {
|
|
offset = numValues > 2 ? valueOffset : (entryOffset + 8);
|
|
vals = [];
|
|
for (n=0;n<numValues;n++) {
|
|
vals[n] = file.getUint16(offset + 2*n, !bigEnd);
|
|
}
|
|
return vals;
|
|
}
|
|
|
|
case 4: // long, 32 bit int
|
|
if (numValues == 1) {
|
|
return file.getUint32(entryOffset + 8, !bigEnd);
|
|
} else {
|
|
vals = [];
|
|
for (n=0;n<numValues;n++) {
|
|
vals[n] = file.getUint32(valueOffset + 4*n, !bigEnd);
|
|
}
|
|
return vals;
|
|
}
|
|
|
|
case 5: // rational = two long values, first is numerator, second is denominator
|
|
if (numValues == 1) {
|
|
numerator = file.getUint32(valueOffset, !bigEnd);
|
|
denominator = file.getUint32(valueOffset+4, !bigEnd);
|
|
val = new Number(numerator / denominator);
|
|
val.numerator = numerator;
|
|
val.denominator = denominator;
|
|
return val;
|
|
} else {
|
|
vals = [];
|
|
for (n=0;n<numValues;n++) {
|
|
numerator = file.getUint32(valueOffset + 8*n, !bigEnd);
|
|
denominator = file.getUint32(valueOffset+4 + 8*n, !bigEnd);
|
|
vals[n] = new Number(numerator / denominator);
|
|
vals[n].numerator = numerator;
|
|
vals[n].denominator = denominator;
|
|
}
|
|
return vals;
|
|
}
|
|
|
|
case 9: // slong, 32 bit signed int
|
|
if (numValues == 1) {
|
|
return file.getInt32(entryOffset + 8, !bigEnd);
|
|
} else {
|
|
vals = [];
|
|
for (n=0;n<numValues;n++) {
|
|
vals[n] = file.getInt32(valueOffset + 4*n, !bigEnd);
|
|
}
|
|
return vals;
|
|
}
|
|
|
|
case 10: // signed rational, two slongs, first is numerator, second is denominator
|
|
if (numValues == 1) {
|
|
return file.getInt32(valueOffset, !bigEnd) / file.getInt32(valueOffset+4, !bigEnd);
|
|
} else {
|
|
vals = [];
|
|
for (n=0;n<numValues;n++) {
|
|
vals[n] = file.getInt32(valueOffset + 8*n, !bigEnd) / file.getInt32(valueOffset+4 + 8*n, !bigEnd);
|
|
}
|
|
return vals;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Given an IFD (Image File Directory) start offset
|
|
* returns an offset to next IFD or 0 if it's the last IFD.
|
|
*/
|
|
function getNextIFDOffset(dataView, dirStart, bigEnd){
|
|
//the first 2bytes means the number of directory entries contains in this IFD
|
|
var entries = dataView.getUint16(dirStart, !bigEnd);
|
|
|
|
// After last directory entry, there is a 4bytes of data,
|
|
// it means an offset to next IFD.
|
|
// If its value is '0x00000000', it means this is the last IFD and there is no linked IFD.
|
|
|
|
return dataView.getUint32(dirStart + 2 + entries * 12, !bigEnd); // each entry is 12 bytes long
|
|
}
|
|
|
|
function readThumbnailImage(dataView, tiffStart, firstIFDOffset, bigEnd){
|
|
// get the IFD1 offset
|
|
var IFD1OffsetPointer = getNextIFDOffset(dataView, tiffStart+firstIFDOffset, bigEnd);
|
|
|
|
if (!IFD1OffsetPointer) {
|
|
// console.log('******** IFD1Offset is empty, image thumb not found ********');
|
|
return {};
|
|
}
|
|
else if (IFD1OffsetPointer > dataView.byteLength) { // this should not happen
|
|
// console.log('******** IFD1Offset is outside the bounds of the DataView ********');
|
|
return {};
|
|
}
|
|
// console.log('******* thumbnail IFD offset (IFD1) is: %s', IFD1OffsetPointer);
|
|
|
|
var thumbTags = readTags(dataView, tiffStart, tiffStart + IFD1OffsetPointer, IFD1Tags, bigEnd)
|
|
|
|
// EXIF 2.3 specification for JPEG format thumbnail
|
|
|
|
// If the value of Compression(0x0103) Tag in IFD1 is '6', thumbnail image format is JPEG.
|
|
// Most of Exif image uses JPEG format for thumbnail. In that case, you can get offset of thumbnail
|
|
// by JpegIFOffset(0x0201) Tag in IFD1, size of thumbnail by JpegIFByteCount(0x0202) Tag.
|
|
// Data format is ordinary JPEG format, starts from 0xFFD8 and ends by 0xFFD9. It seems that
|
|
// JPEG format and 160x120pixels of size are recommended thumbnail format for Exif2.1 or later.
|
|
|
|
if (thumbTags['Compression']) {
|
|
// console.log('Thumbnail image found!');
|
|
|
|
switch (thumbTags['Compression']) {
|
|
case 6:
|
|
// console.log('Thumbnail image format is JPEG');
|
|
if (thumbTags.JpegIFOffset && thumbTags.JpegIFByteCount) {
|
|
// extract the thumbnail
|
|
var tOffset = tiffStart + thumbTags.JpegIFOffset;
|
|
var tLength = thumbTags.JpegIFByteCount;
|
|
thumbTags['blob'] = new Blob([new Uint8Array(dataView.buffer, tOffset, tLength)], {
|
|
type: 'image/jpeg'
|
|
});
|
|
}
|
|
break;
|
|
|
|
case 1:
|
|
console.log("Thumbnail image format is TIFF, which is not implemented.");
|
|
break;
|
|
default:
|
|
console.log("Unknown thumbnail image format '%s'", thumbTags['Compression']);
|
|
}
|
|
}
|
|
else if (thumbTags['PhotometricInterpretation'] == 2) {
|
|
console.log("Thumbnail image format is RGB, which is not implemented.");
|
|
}
|
|
return thumbTags;
|
|
}
|
|
|
|
function getStringFromDB(buffer, start, length) {
|
|
var outstr = "";
|
|
for (n = start; n < start+length; n++) {
|
|
outstr += String.fromCharCode(buffer.getUint8(n));
|
|
}
|
|
return outstr;
|
|
}
|
|
|
|
function readEXIFData(file, start) {
|
|
if (getStringFromDB(file, start, 4) != "Exif") {
|
|
if (debug) console.log("Not valid EXIF data! " + getStringFromDB(file, start, 4));
|
|
return false;
|
|
}
|
|
|
|
var bigEnd,
|
|
tags, tag,
|
|
exifData, gpsData,
|
|
tiffOffset = start + 6;
|
|
|
|
// test for TIFF validity and endianness
|
|
if (file.getUint16(tiffOffset) == 0x4949) {
|
|
bigEnd = false;
|
|
} else if (file.getUint16(tiffOffset) == 0x4D4D) {
|
|
bigEnd = true;
|
|
} else {
|
|
if (debug) console.log("Not valid TIFF data! (no 0x4949 or 0x4D4D)");
|
|
return false;
|
|
}
|
|
|
|
if (file.getUint16(tiffOffset+2, !bigEnd) != 0x002A) {
|
|
if (debug) console.log("Not valid TIFF data! (no 0x002A)");
|
|
return false;
|
|
}
|
|
|
|
var firstIFDOffset = file.getUint32(tiffOffset+4, !bigEnd);
|
|
|
|
if (firstIFDOffset < 0x00000008) {
|
|
if (debug) console.log("Not valid TIFF data! (First offset less than 8)", file.getUint32(tiffOffset+4, !bigEnd));
|
|
return false;
|
|
}
|
|
|
|
tags = readTags(file, tiffOffset, tiffOffset + firstIFDOffset, TiffTags, bigEnd);
|
|
|
|
if (tags.ExifIFDPointer) {
|
|
exifData = readTags(file, tiffOffset, tiffOffset + tags.ExifIFDPointer, ExifTags, bigEnd);
|
|
for (tag in exifData) {
|
|
switch (tag) {
|
|
case "LightSource" :
|
|
case "Flash" :
|
|
case "MeteringMode" :
|
|
case "ExposureProgram" :
|
|
case "SensingMethod" :
|
|
case "SceneCaptureType" :
|
|
case "SceneType" :
|
|
case "CustomRendered" :
|
|
case "WhiteBalance" :
|
|
case "GainControl" :
|
|
case "Contrast" :
|
|
case "Saturation" :
|
|
case "Sharpness" :
|
|
case "SubjectDistanceRange" :
|
|
case "FileSource" :
|
|
exifData[tag] = StringValues[tag][exifData[tag]];
|
|
break;
|
|
|
|
case "ExifVersion" :
|
|
case "FlashpixVersion" :
|
|
exifData[tag] = String.fromCharCode(exifData[tag][0], exifData[tag][1], exifData[tag][2], exifData[tag][3]);
|
|
break;
|
|
|
|
case "ComponentsConfiguration" :
|
|
exifData[tag] =
|
|
StringValues.Components[exifData[tag][0]] +
|
|
StringValues.Components[exifData[tag][1]] +
|
|
StringValues.Components[exifData[tag][2]] +
|
|
StringValues.Components[exifData[tag][3]];
|
|
break;
|
|
}
|
|
tags[tag] = exifData[tag];
|
|
}
|
|
}
|
|
|
|
if (tags.GPSInfoIFDPointer) {
|
|
gpsData = readTags(file, tiffOffset, tiffOffset + tags.GPSInfoIFDPointer, GPSTags, bigEnd);
|
|
for (tag in gpsData) {
|
|
switch (tag) {
|
|
case "GPSVersionID" :
|
|
gpsData[tag] = gpsData[tag][0] +
|
|
"." + gpsData[tag][1] +
|
|
"." + gpsData[tag][2] +
|
|
"." + gpsData[tag][3];
|
|
break;
|
|
}
|
|
tags[tag] = gpsData[tag];
|
|
}
|
|
}
|
|
|
|
// extract thumbnail
|
|
tags['thumbnail'] = readThumbnailImage(file, tiffOffset, firstIFDOffset, bigEnd);
|
|
|
|
return tags;
|
|
}
|
|
|
|
function findXMPinJPEG(file) {
|
|
|
|
if (!('DOMParser' in self)) {
|
|
// console.warn('XML parsing not supported without DOMParser');
|
|
return;
|
|
}
|
|
var dataView = new DataView(file);
|
|
|
|
if (debug) console.log("Got file of length " + file.byteLength);
|
|
if ((dataView.getUint8(0) != 0xFF) || (dataView.getUint8(1) != 0xD8)) {
|
|
if (debug) console.log("Not a valid JPEG");
|
|
return false; // not a valid jpeg
|
|
}
|
|
|
|
var offset = 2,
|
|
length = file.byteLength,
|
|
dom = new DOMParser();
|
|
|
|
while (offset < (length-4)) {
|
|
if (getStringFromDB(dataView, offset, 4) == "http") {
|
|
var startOffset = offset - 1;
|
|
var sectionLength = dataView.getUint16(offset - 2) - 1;
|
|
var xmpString = getStringFromDB(dataView, startOffset, sectionLength)
|
|
var xmpEndIndex = xmpString.indexOf('xmpmeta>') + 8;
|
|
xmpString = xmpString.substring( xmpString.indexOf( '<x:xmpmeta' ), xmpEndIndex );
|
|
|
|
var indexOfXmp = xmpString.indexOf('x:xmpmeta') + 10
|
|
//Many custom written programs embed xmp/xml without any namespace. Following are some of them.
|
|
//Without these namespaces, XML is thought to be invalid by parsers
|
|
xmpString = xmpString.slice(0, indexOfXmp)
|
|
+ 'xmlns:Iptc4xmpCore="http://iptc.org/std/Iptc4xmpCore/1.0/xmlns/" '
|
|
+ 'xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" '
|
|
+ 'xmlns:tiff="http://ns.adobe.com/tiff/1.0/" '
|
|
+ 'xmlns:plus="http://schemas.android.com/apk/lib/com.google.android.gms.plus" '
|
|
+ 'xmlns:ext="http://www.gettyimages.com/xsltExtension/1.0" '
|
|
+ 'xmlns:exif="http://ns.adobe.com/exif/1.0/" '
|
|
+ 'xmlns:stEvt="http://ns.adobe.com/xap/1.0/sType/ResourceEvent#" '
|
|
+ 'xmlns:stRef="http://ns.adobe.com/xap/1.0/sType/ResourceRef#" '
|
|
+ 'xmlns:crs="http://ns.adobe.com/camera-raw-settings/1.0/" '
|
|
+ 'xmlns:xapGImg="http://ns.adobe.com/xap/1.0/g/img/" '
|
|
+ 'xmlns:Iptc4xmpExt="http://iptc.org/std/Iptc4xmpExt/2008-02-29/" '
|
|
+ xmpString.slice(indexOfXmp)
|
|
|
|
var domDocument = dom.parseFromString( xmpString, 'text/xml' );
|
|
return xml2Object(domDocument);
|
|
} else{
|
|
offset++;
|
|
}
|
|
}
|
|
}
|
|
|
|
function xml2json(xml) {
|
|
var json = {};
|
|
|
|
if (xml.nodeType == 1) { // element node
|
|
if (xml.attributes.length > 0) {
|
|
json['@attributes'] = {};
|
|
for (var j = 0; j < xml.attributes.length; j++) {
|
|
var attribute = xml.attributes.item(j);
|
|
json['@attributes'][attribute.nodeName] = attribute.nodeValue;
|
|
}
|
|
}
|
|
} else if (xml.nodeType == 3) { // text node
|
|
return xml.nodeValue;
|
|
}
|
|
|
|
// deal with children
|
|
if (xml.hasChildNodes()) {
|
|
for(var i = 0; i < xml.childNodes.length; i++) {
|
|
var child = xml.childNodes.item(i);
|
|
var nodeName = child.nodeName;
|
|
if (json[nodeName] == null) {
|
|
json[nodeName] = xml2json(child);
|
|
} else {
|
|
if (json[nodeName].push == null) {
|
|
var old = json[nodeName];
|
|
json[nodeName] = [];
|
|
json[nodeName].push(old);
|
|
}
|
|
json[nodeName].push(xml2json(child));
|
|
}
|
|
}
|
|
}
|
|
|
|
return json;
|
|
}
|
|
|
|
function xml2Object(xml) {
|
|
try {
|
|
var obj = {};
|
|
if (xml.children.length > 0) {
|
|
for (var i = 0; i < xml.children.length; i++) {
|
|
var item = xml.children.item(i);
|
|
var attributes = item.attributes;
|
|
for(var idx in attributes) {
|
|
var itemAtt = attributes[idx];
|
|
var dataKey = itemAtt.nodeName;
|
|
var dataValue = itemAtt.nodeValue;
|
|
|
|
if(dataKey !== undefined) {
|
|
obj[dataKey] = dataValue;
|
|
}
|
|
}
|
|
var nodeName = item.nodeName;
|
|
|
|
if (typeof (obj[nodeName]) == "undefined") {
|
|
obj[nodeName] = xml2json(item);
|
|
} else {
|
|
if (typeof (obj[nodeName].push) == "undefined") {
|
|
var old = obj[nodeName];
|
|
|
|
obj[nodeName] = [];
|
|
obj[nodeName].push(old);
|
|
}
|
|
obj[nodeName].push(xml2json(item));
|
|
}
|
|
}
|
|
} else {
|
|
obj = xml.textContent;
|
|
}
|
|
return obj;
|
|
} catch (e) {
|
|
console.log(e.message);
|
|
}
|
|
}
|
|
|
|
EXIF.enableXmp = function() {
|
|
EXIF.isXmpEnabled = true;
|
|
}
|
|
|
|
EXIF.disableXmp = function() {
|
|
EXIF.isXmpEnabled = false;
|
|
}
|
|
|
|
EXIF.getData = function(img, callback) {
|
|
if (((self.Image && img instanceof self.Image)
|
|
|| (self.HTMLImageElement && img instanceof self.HTMLImageElement))
|
|
&& !img.complete)
|
|
return false;
|
|
|
|
if (!imageHasData(img)) {
|
|
getImageData(img, callback);
|
|
} else {
|
|
if (callback) {
|
|
callback.call(img);
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
EXIF.getTag = function(img, tag) {
|
|
if (!imageHasData(img)) return;
|
|
return img.exifdata[tag];
|
|
}
|
|
|
|
EXIF.getIptcTag = function(img, tag) {
|
|
if (!imageHasData(img)) return;
|
|
return img.iptcdata[tag];
|
|
}
|
|
|
|
EXIF.getAllTags = function(img) {
|
|
if (!imageHasData(img)) return {};
|
|
var a,
|
|
data = img.exifdata,
|
|
tags = {};
|
|
for (a in data) {
|
|
if (data.hasOwnProperty(a)) {
|
|
tags[a] = data[a];
|
|
}
|
|
}
|
|
return tags;
|
|
}
|
|
|
|
EXIF.getAllIptcTags = function(img) {
|
|
if (!imageHasData(img)) return {};
|
|
var a,
|
|
data = img.iptcdata,
|
|
tags = {};
|
|
for (a in data) {
|
|
if (data.hasOwnProperty(a)) {
|
|
tags[a] = data[a];
|
|
}
|
|
}
|
|
return tags;
|
|
}
|
|
|
|
EXIF.pretty = function(img) {
|
|
if (!imageHasData(img)) return "";
|
|
var a,
|
|
data = img.exifdata,
|
|
strPretty = "";
|
|
for (a in data) {
|
|
if (data.hasOwnProperty(a)) {
|
|
if (typeof data[a] == "object") {
|
|
if (data[a] instanceof Number) {
|
|
strPretty += a + " : " + data[a] + " [" + data[a].numerator + "/" + data[a].denominator + "]\r\n";
|
|
} else {
|
|
strPretty += a + " : [" + data[a].length + " values]\r\n";
|
|
}
|
|
} else {
|
|
strPretty += a + " : " + data[a] + "\r\n";
|
|
}
|
|
}
|
|
}
|
|
return strPretty;
|
|
}
|
|
|
|
EXIF.readFromBinaryFile = function(file) {
|
|
return findEXIFinJPEG(file);
|
|
}
|
|
|
|
if (typeof define === 'function' && define.amd) {
|
|
define('exif-js', [], function() {
|
|
return EXIF;
|
|
});
|
|
}
|
|
}.call(this));
|
|
|