// @ts-nocheck
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import { base64ToArrayBuffer } from '../base64ToArrayBuffer';
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import { pathToBase64 } from '../pathToBase64';
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// import { isBase64 } from '../isBase64';
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import { isBase64DataUri } from '../isBase64';
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import { isString } from '../isString';
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interface File {
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exifdata : any
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iptcdata : any
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xmpdata : any
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src : string
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}
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class EXIF {
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isXmpEnabled = false
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debug = false
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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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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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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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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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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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enableXmp() {
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this.isXmpEnabled = true
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}
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disableXmp() {
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this.isXmpEnabled = false;
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}
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/**
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* 获取图片数据
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* @param img 图片地址
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* @param callback 回调 返回图片数据
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* */
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getData(img : any, callback : Function) {
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// if (((self.Image && img instanceof self.Image) || (self.HTMLImageElement && img instanceof self.HTMLImageElement)) && !img.complete)
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// return false;
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let file : File = {
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src: '',
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exifdata: null,
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iptcdata: null,
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xmpdata: null,
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}
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if (isBase64(img)) {
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file.src = img
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} else if (img.path) {
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file.src = img.path
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} else if (isString(img)) {
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file.src = img
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} else {
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return false;
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}
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if (!imageHasData(file)) {
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getImageData(file, callback);
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} else {
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if (callback) {
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callback.call(file);
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}
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}
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return true;
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}
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/**
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* 获取图片tag
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* @param img 图片数据
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* @param tag tag 类型
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* */
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getTag(img : File, tag : string) {
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if (!imageHasData(img)) return;
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return img.exifdata[tag];
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}
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getIptcTag(img : File, tag : string) {
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if (!imageHasData(img)) return;
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return img.iptcdata[tag];
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}
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getAllTags(img : File) {
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if (!imageHasData(img)) return {};
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let a,
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data = img.exifdata,
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tags = {};
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for (a in data) {
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if (data.hasOwnProperty(a)) {
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tags[a] = data[a];
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}
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}
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return tags;
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}
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getAllIptcTags(img : File) {
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if (!imageHasData(img)) return {};
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let a,
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data = img.iptcdata,
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tags = {};
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for (a in data) {
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if (data.hasOwnProperty(a)) {
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tags[a] = data[a];
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}
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}
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return tags;
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}
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pretty(img : File) {
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if (!imageHasData(img)) return "";
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let a,
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data = img.exifdata,
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strPretty = "";
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for (a in data) {
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if (data.hasOwnProperty(a)) {
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if (typeof data[a] == "object") {
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if (data[a] instanceof Number) {
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strPretty += a + " : " + data[a] + " [" + data[a].numerator + "/" + data[a]
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.denominator + "]\r\n";
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} else {
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strPretty += a + " : [" + data[a].length + " values]\r\n";
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}
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} else {
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strPretty += a + " : " + data[a] + "\r\n";
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}
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}
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}
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return strPretty;
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}
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readFromBinaryFile(file: ArrayBuffer) {
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return findEXIFinJPEG(file);
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}
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}
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export const exif = new EXIF()
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// export function getData(img, callback) {
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// const exif = new EXIF()
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// exif.getData(img, callback)
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// }
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// export default {getData}
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const ExifTags = exif.Tags
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const TiffTags = exif.TiffTags
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const IFD1Tags = exif.IFD1Tags
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const GPSTags = exif.GPSTags
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const StringValues = exif.StringValues
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function imageHasData(img : File) : boolean {
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return !!(img.exifdata);
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}
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function objectURLToBlob(url : string, callback : Function) {
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try {
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const 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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} catch (e) {
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console.warn(e)
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}
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}
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function getImageData(img : File, callback : Function) {
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function handleBinaryFile(binFile: ArrayBuffer) {
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const data = findEXIFinJPEG(binFile);
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img.exifdata = data ?? {};
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const iptcdata = findIPTCinJPEG(binFile);
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img.iptcdata = iptcdata ?? {};
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if (exif.isXmpEnabled) {
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const 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(base64ToArrayBuffer(img.src));
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} else if (/^blob\:/i.test(img.src) && typeof FileReader !== 'undefined') { // 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 : Blob) {
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fileReader.readAsArrayBuffer(blob);
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});
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} else if (typeof XMLHttpRequest !== 'undefined') {
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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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} else {
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pathToBase64(img.src).then(res => {
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handleBinaryFile(base64ToArrayBuffer(res));
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})
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}
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} else if (typeof FileReader !== 'undefined' && 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 : any) {
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if (exif.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: ArrayBuffer) {
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const dataView = new DataView(file);
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if (exif.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 (exif.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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let 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 (exif.debug) console.log("Not a valid marker at offset " + offset + ", found: " + dataView.getUint8(
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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 (exif.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 (exif.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: ArrayBuffer) {
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const dataView = new DataView(file);
|
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if (exif.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 (exif.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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let offset = 2,
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length = file.byteLength;
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|
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const isFieldSegmentStart = function (dataView, offset: number) {
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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) {
|
|
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
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nameHeaderLength = 4;
|
}
|
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var startOffset = offset + 8 + nameHeaderLength;
|
var sectionLength = dataView.getUint16(offset + 6 + nameHeaderLength);
|
|
return readIPTCData(file, startOffset, sectionLength);
|
|
break;
|
|
}
|
|
|
// Not the marker, continue searching
|
offset++;
|
|
}
|
|
}
|
|
const IptcFieldMap = {
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0x78: 'caption',
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0x6E: 'credit',
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0x19: 'keywords',
|
0x37: 'dateCreated',
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0x50: 'byline',
|
0x55: 'bylineTitle',
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0x7A: 'captionWriter',
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0x69: 'headline',
|
0x74: 'copyright',
|
0x0F: 'category'
|
};
|
|
function readIPTCData(file: ArrayBuffer, startOffset: number, sectionLength: number) {
|
const dataView = new DataView(file);
|
let data = {};
|
let fieldValue, fieldName, dataSize, segmentType, segmentSize;
|
let 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: DataView, tiffStart: number, dirStart: number, strings: any[], bigEnd: number) {
|
let entries = file.getUint16(dirStart, !bigEnd),
|
tags = {},
|
entryOffset, tag;
|
|
for (let i = 0; i < entries; i++) {
|
entryOffset = dirStart + i * 12 + 2;
|
tag = strings[file.getUint16(entryOffset, !bigEnd)];
|
if (!tag && exif.debug) console.log("Unknown tag: " + file.getUint16(entryOffset, !bigEnd));
|
tags[tag] = readTagValue(file, entryOffset, tiffStart, dirStart, bigEnd);
|
}
|
return tags;
|
}
|
|
function readTagValue(file: DataView, entryOffset: number, tiffStart: number, dirStart: number, bigEnd: number) {
|
let 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: DataView, dirStart: number, bigEnd: number) {
|
//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: DataView, tiffStart: number, firstIFDOffset: number, bigEnd: number) {
|
// get the IFD1 offset
|
const 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);
|
|
let thumbTags : any = 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'] && typeof Blob !== 'undefined') {
|
// 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: DataView, start: number, length: number) {
|
let outstr = "";
|
for (let n = start; n < start + length; n++) {
|
outstr += String.fromCharCode(buffer.getUint8(n));
|
}
|
return outstr;
|
}
|
|
function readEXIFData(file: DataView, start: number) {
|
if (getStringFromDB(file, start, 4) != "Exif") {
|
if (exif.debug) console.log("Not valid EXIF data! " + getStringFromDB(file, start, 4));
|
return false;
|
}
|
|
let 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 (exif.debug) console.log("Not valid TIFF data! (no 0x4949 or 0x4D4D)");
|
return false;
|
}
|
|
if (file.getUint16(tiffOffset + 2, !bigEnd) != 0x002A) {
|
if (exif.debug) console.log("Not valid TIFF data! (no 0x002A)");
|
return false;
|
}
|
|
const firstIFDOffset = file.getUint32(tiffOffset + 4, !bigEnd);
|
|
if (firstIFDOffset < 0x00000008) {
|
if (exif.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: ArrayBuffer) {
|
|
if (!('DOMParser' in self)) {
|
// console.warn('XML parsing not supported without DOMParser');
|
return;
|
}
|
const dataView = new DataView(file);
|
|
if (exif.debug) console.log("Got file of length " + file.byteLength);
|
if ((dataView.getUint8(0) != 0xFF) || (dataView.getUint8(1) != 0xD8)) {
|
if (exif.debug) console.log("Not a valid JPEG");
|
return false; // not a valid jpeg
|
}
|
|
let offset = 2,
|
length = file.byteLength,
|
dom = new DOMParser();
|
|
while (offset < (length - 4)) {
|
if (getStringFromDB(dataView, offset, 4) == "http") {
|
const startOffset = offset - 1;
|
const sectionLength = dataView.getUint16(offset - 2) - 1;
|
let xmpString = getStringFromDB(dataView, startOffset, sectionLength)
|
const xmpEndIndex = xmpString.indexOf('xmpmeta>') + 8;
|
xmpString = xmpString.substring(xmpString.indexOf('<x:xmpmeta'), xmpEndIndex);
|
|
const 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: any) {
|
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: any) {
|
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);
|
}
|
}
|
