640 lines
23 KiB
JavaScript
Executable File
640 lines
23 KiB
JavaScript
Executable File
/*
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* Javascript EXIF Reader 0.1.6
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* Copyright (c) 2008 Jacob Seidelin, jseidelin@nihilogic.dk, http://blog.nihilogic.dk/
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* Licensed under the MPL License [http://www.nihilogic.dk/licenses/mpl-license.txt]
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*/
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var EXIF = (function() {
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var debug = false;
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var ExifTags = {
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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 = {
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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 = {
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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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var 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 getImageData(img, callback) {
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BinaryAjax(img.src, function(http) {
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var data = findEXIFinJPEG(http.binaryResponse);
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img.exifdata = data || {};
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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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}
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function findEXIFinJPEG(file) {
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if (file.getByteAt(0) != 0xFF || file.getByteAt(1) != 0xD8) {
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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.getLength(),
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marker;
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while (offset < length) {
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if (file.getByteAt(offset) != 0xFF) {
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if (debug)
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console.log("Not a valid marker at offset " + offset + ", found: " + file.getByteAt(offset));
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return false; // not a valid marker, something is wrong
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}
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marker = file.getByteAt(offset + 1);
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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 == 22400) {
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if (debug)
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console.log("Found 0xFFE1 marker");
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return readEXIFData(file, offset + 4, file.getShortAt(offset + 2, true) - 2);
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// offset += 2 + file.getShortAt(offset+2, true);
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} else if (marker == 225) {
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// 0xE1 = Application-specific 1 (for EXIF)
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if (debug)
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console.log("Found 0xFFE1 marker");
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return readEXIFData(file, offset + 4, file.getShortAt(offset + 2, true) - 2);
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} else {
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offset += 2 + file.getShortAt(offset + 2, true);
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}
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}
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}
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function readTags(file, tiffStart, dirStart, strings, bigEnd) {
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var entries = file.getShortAt(dirStart, bigEnd),
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tags = {},
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entryOffset, tag,
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i;
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for (i = 0; i < entries; i++) {
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entryOffset = dirStart + i * 12 + 2;
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tag = strings[file.getShortAt(entryOffset, bigEnd)];
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if (!tag && debug)
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console.log("Unknown tag: " + file.getShortAt(entryOffset, bigEnd));
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tags[tag] = readTagValue(file, entryOffset, tiffStart, dirStart, bigEnd);
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}
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return tags;
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}
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function readTagValue(file, entryOffset, tiffStart, dirStart, bigEnd) {
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var type = file.getShortAt(entryOffset + 2, bigEnd),
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numValues = file.getLongAt(entryOffset + 4, bigEnd),
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valueOffset = file.getLongAt(entryOffset + 8, bigEnd) + tiffStart,
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offset,
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vals, val, n,
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numerator, denominator;
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switch (type) {
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case 1: // byte, 8-bit unsigned int
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case 7: // undefined, 8-bit byte, value depending on field
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if (numValues == 1) {
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return file.getByteAt(entryOffset + 8, bigEnd);
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} else {
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offset = numValues > 4 ? valueOffset : (entryOffset + 8);
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vals = [];
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for (n = 0; n < numValues; n++) {
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vals[n] = file.getByteAt(offset + n);
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}
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return vals;
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}
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case 2: // ascii, 8-bit byte
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offset = numValues > 4 ? valueOffset : (entryOffset + 8);
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return file.getStringAt(offset, numValues - 1);
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case 3: // short, 16 bit int
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if (numValues == 1) {
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return file.getShortAt(entryOffset + 8, bigEnd);
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} else {
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offset = numValues > 2 ? valueOffset : (entryOffset + 8);
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vals = [];
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for (n = 0; n < numValues; n++) {
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vals[n] = file.getShortAt(offset + 2 * n, bigEnd);
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}
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return vals;
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}
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case 4: // long, 32 bit int
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if (numValues == 1) {
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return file.getLongAt(entryOffset + 8, bigEnd);
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} else {
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vals = [];
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for (var n = 0; n < numValues; n++) {
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vals[n] = file.getLongAt(valueOffset + 4 * n, bigEnd);
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}
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return vals;
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}
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case 5: // rational = two long values, first is numerator, second is denominator
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if (numValues == 1) {
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numerator = file.getLongAt(valueOffset, bigEnd);
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denominator = file.getLongAt(valueOffset + 4, bigEnd);
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val = new Number(numerator / denominator);
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val.numerator = numerator;
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val.denominator = denominator;
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return val;
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} else {
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vals = [];
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for (n = 0; n < numValues; n++) {
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numerator = file.getLongAt(valueOffset + 8 * n, bigEnd);
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denominator = file.getLongAt(valueOffset + 4 + 8 * n, bigEnd);
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vals[n] = new Number(numerator / denominator);
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vals[n].numerator = numerator;
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vals[n].denominator = denominator;
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}
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return vals;
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}
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case 9: // slong, 32 bit signed int
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if (numValues == 1) {
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return file.getSLongAt(entryOffset + 8, bigEnd);
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} else {
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vals = [];
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for (n = 0; n < numValues; n++) {
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vals[n] = file.getSLongAt(valueOffset + 4 * n, bigEnd);
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}
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return vals;
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}
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case 10: // signed rational, two slongs, first is numerator, second is denominator
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if (numValues == 1) {
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return file.getSLongAt(valueOffset, bigEnd) / file.getSLongAt(valueOffset + 4, bigEnd);
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} else {
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vals = [];
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for (n = 0; n < numValues; n++) {
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vals[n] = file.getSLongAt(valueOffset + 8 * n, bigEnd) / file.getSLongAt(valueOffset + 4 + 8 * n, bigEnd);
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}
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return vals;
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}
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}
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}
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function readEXIFData(file, start) {
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if (file.getStringAt(start, 4) != "Exif") {
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if (debug)
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console.log("Not valid EXIF data! " + file.getStringAt(start, 4));
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return false;
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}
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var bigEnd,
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tags, tag,
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exifData, gpsData,
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tiffOffset = start + 6;
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// test for TIFF validity and endianness
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if (file.getShortAt(tiffOffset) == 0x4949) {
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bigEnd = false;
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} else if (file.getShortAt(tiffOffset) == 0x4D4D) {
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bigEnd = true;
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} else {
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if (debug)
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console.log("Not valid TIFF data! (no 0x4949 or 0x4D4D)");
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return false;
|
|
}
|
|
|
|
if (file.getShortAt(tiffOffset + 2, bigEnd) != 0x002A) {
|
|
if (debug)
|
|
console.log("Not valid TIFF data! (no 0x002A)");
|
|
return false;
|
|
}
|
|
|
|
if (file.getLongAt(tiffOffset + 4, bigEnd) != 0x00000008) {
|
|
if (debug)
|
|
console.log("Not valid TIFF data! (First offset not 8)", file.getShortAt(tiffOffset + 4, bigEnd));
|
|
return false;
|
|
}
|
|
|
|
tags = readTags(file, tiffOffset, tiffOffset + 8, 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];
|
|
}
|
|
}
|
|
|
|
return tags;
|
|
}
|
|
|
|
|
|
function getData(img, callback) {
|
|
if (!img.complete)
|
|
return false;
|
|
if (!imageHasData(img)) {
|
|
getImageData(img, callback);
|
|
} else {
|
|
if (callback) {
|
|
callback.call(img);
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
function getTag(img, tag) {
|
|
if (!imageHasData(img))
|
|
return;
|
|
return img.exifdata[tag];
|
|
}
|
|
|
|
function getAllTags(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;
|
|
}
|
|
|
|
function pretty(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;
|
|
}
|
|
|
|
function readFromBinaryFile(file) {
|
|
return findEXIFinJPEG(file);
|
|
}
|
|
|
|
|
|
return {
|
|
readFromBinaryFile: readFromBinaryFile,
|
|
pretty: pretty,
|
|
getTag: getTag,
|
|
getAllTags: getAllTags,
|
|
getData: getData,
|
|
Tags: ExifTags,
|
|
TiffTags: TiffTags,
|
|
GPSTags: GPSTags,
|
|
StringValues: StringValues
|
|
};
|
|
|
|
})(); |