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[![Tests on Linux, MacOS and Windows](https://github.com/bep/goexif/workflows/Test/badge.svg)](https://github.com/bep/goexif/actions?query=workflow:Test) | ||
[![Go Report Card](https://goreportcard.com/badge/github.com/bep/goexif)](https://goreportcard.com/report/github.com/bep/goexif) | ||
[![GoDoc](https://godoc.org/github.com/bep/goexif?status.svg)](https://godoc.org/github.com/bep/goexif) | ||
[![GoDoc](https://godoc.org/github.com/bep/goexif?status.svg)](https://godoc.org/github.com/bep/goexif) | ||
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# Work in progress | ||
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This is not ready, yet, but the goal is to use this as the library to read image metadata in Hugo. The existing Go libraries I have found is not maintained anymore and too complex to build on top of. The goal of this library is to be relatively small and simple, but I may prove myself wrong. |
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package goexif | ||
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import "fmt" | ||
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const ( | ||
OrientationUnspecified Orientation = iota | ||
OrientationNormal | ||
OrientationFlipH | ||
OrientationRotate180 | ||
OrientationFlipV | ||
OrientationTranspose | ||
OrientationRotate270 | ||
OrientationTransverse | ||
OrientationRotate90 | ||
) | ||
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const ( | ||
// TODO1 check usage. | ||
markerSOI = 0xffd8 | ||
markerAPP1 = 0xffe1 | ||
markerApp13 = 0xffed | ||
exifPointer = 0x8769 | ||
gpsPointer = 0x8825 | ||
interopPointer = 0xa005 | ||
exifHeader = 0x45786966 | ||
byteOrderBigEndian = 0x4d4d | ||
byteOrderLittleEndian = 0x4949 | ||
tagOrientation = 0x0112 | ||
tagDate = 0x0132 | ||
) | ||
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var errStop = fmt.Errorf("stop") | ||
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const ( | ||
typeUnsignedByte exifType = 1 | ||
typeUnsignedAscii exifType = 2 | ||
typeUnsignedShort exifType = 3 | ||
typeUnsignedLong exifType = 4 | ||
typeUnsignedRat exifType = 5 | ||
typeSignedByte exifType = 6 | ||
typeUndef exifType = 7 | ||
typeSignedShort exifType = 8 | ||
typeSignedLong exifType = 9 | ||
typeSignedRat exifType = 10 | ||
typeSignedFloat exifType = 11 | ||
typeSignedDouble exifType = 12 | ||
) | ||
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// Size in bytes of each type. | ||
var typeSize = map[exifType]uint32{ | ||
typeUnsignedByte: 1, | ||
typeUnsignedAscii: 1, | ||
typeUnsignedShort: 2, | ||
typeUnsignedLong: 4, | ||
typeUnsignedRat: 8, | ||
typeSignedByte: 1, | ||
typeUndef: 1, | ||
typeSignedShort: 2, | ||
typeSignedLong: 4, | ||
typeSignedRat: 8, | ||
typeSignedFloat: 4, | ||
typeSignedDouble: 8, | ||
} | ||
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// UnknownPrefix is used as prefix for unknown tags. | ||
const UnknownPrefix = "UnknownTag_" | ||
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var ( | ||
fieldsExif = map[uint16]string{0x100: "ImageWidth", 0x101: "ImageLength", 0x102: "BitsPerSample", 0x103: "Compression", 0x106: "PhotometricInterpretation", 0x10e: "ImageDescription", 0x10f: "Make", 0x110: "Model", 0x112: "Orientation", 0x115: "SamplesPerPixel", 0x11a: "XResolution", 0x11b: "YResolution", 0x11c: "PlanarConfiguration", 0x128: "ResolutionUnit", 0x131: "Software", 0x132: "DateTime", 0x13b: "Artist", 0x212: "YCbCrSubSampling", 0x213: "YCbCrPositioning", 0x8298: "Copyright", 0x829a: "ExposureTime", 0x829d: "FNumber", 0x8769: "ExifIFDPointer", 0x8822: "ExposureProgram", 0x8824: "SpectralSensitivity", 0x8825: "GPSInfoIFDPointer", 0x8827: "ISOSpeedRatings", 0x8828: "OECF", 0x9000: "ExifVersion", 0x9003: "DateTimeOriginal", 0x9004: "DateTimeDigitized", 0x9101: "ComponentsConfiguration", 0x9102: "CompressedBitsPerPixel", 0x9201: "ShutterSpeedValue", 0x9202: "ApertureValue", 0x9203: "BrightnessValue", 0x9204: "ExposureBiasValue", 0x9205: "MaxApertureValue", 0x9206: "SubjectDistance", 0x9207: "MeteringMode", 0x9208: "LightSource", 0x9209: "Flash", 0x920a: "FocalLength", 0x9214: "SubjectArea", 0x927c: "MakerNote", 0x9286: "UserComment", 0x9290: "SubSecTime", 0x9291: "SubSecTimeOriginal", 0x9292: "SubSecTimeDigitized", 0x9c9b: "XPTitle", 0x9c9c: "XPComment", 0x9c9d: "XPAuthor", 0x9c9e: "XPKeywords", 0x9c9f: "XPSubject", 0xa000: "FlashpixVersion", 0xa001: "ColorSpace", 0xa002: "PixelXDimension", 0xa003: "PixelYDimension", 0xa004: "RelatedSoundFile", 0xa005: "InteroperabilityIFDPointer", 0xa20b: "FlashEnergy", 0xa20c: "SpatialFrequencyResponse", 0xa20e: "FocalPlaneXResolution", 0xa20f: "FocalPlaneYResolution", 0xa210: "FocalPlaneResolutionUnit", 0xa214: "SubjectLocation", 0xa215: "ExposureIndex", 0xa217: "SensingMethod", 0xa300: "FileSource", 0xa301: "SceneType", 0xa302: "CFAPattern", 0xa401: "CustomRendered", 0xa402: "ExposureMode", 0xa403: "WhiteBalance", 0xa404: "DigitalZoomRatio", 0xa405: "FocalLengthIn35mmFilm", 0xa406: "SceneCaptureType", 0xa407: "GainControl", 0xa408: "Contrast", 0xa409: "Saturation", 0xa40a: "Sharpness", 0xa40b: "DeviceSettingDescription", 0xa40c: "SubjectDistanceRange", 0xa420: "ImageUniqueID", 0xa433: "LensMake", 0xa434: "LensModel"} | ||
fieldsGps = map[uint16]string{0x0: "GPSVersionID", 0x1: "GPSLatitudeRef", 0x2: "GPSLatitude", 0x3: "GPSLongitudeRef", 0x4: "GPSLongitude", 0x5: "GPSAltitudeRef", 0x6: "GPSAltitude", 0x7: "GPSTimeStamp", 0x8: "GPSSatelites", 0x9: "GPSStatus", 0xa: "GPSMeasureMode", 0xb: "GPSDOP", 0xc: "GPSSpeedRef", 0xd: "GPSSpeed", 0xe: "GPSTrackRef", 0xf: "GPSTrack", 0x10: "GPSImgDirectionRef", 0x11: "GPSImgDirection", 0x12: "GPSMapDatum", 0x13: "GPSDestLatitudeRef", 0x14: "GPSDestLatitude", 0x15: "GPSDestLongitudeRef", 0x16: "GPSDestLongitude", 0x17: "GPSDestBearingRef", 0x18: "GPSDestBearing", 0x19: "GPSDestDistanceRef", 0x1a: "GPSDestDistance", 0x1b: "GPSProcessingMethod", 0x1c: "GPSAreaInformation", 0x1d: "GPSDateStamp", 0x1e: "GPSDifferential"} | ||
fieldsInterop = map[uint16]string{0x1: "InteroperabilityIndex"} | ||
fieldsThumbnail = map[uint16]string{0x201: "ThumbJPEGInterchangeFormat", 0x202: "ThumbJPEGInterchangeFormatLength"} | ||
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fieldsAll = map[uint16]string{} | ||
) | ||
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func init() { | ||
for k, v := range fieldsExif { | ||
fieldsAll[k] = v | ||
} | ||
for k, v := range fieldsGps { | ||
fieldsAll[k] = v | ||
} | ||
for k, v := range fieldsInterop { | ||
fieldsAll[k] = v | ||
} | ||
for k, v := range fieldsThumbnail { | ||
fieldsAll[k] = v | ||
} | ||
} |
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package goexif | ||
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var iptcFieldMap = map[uint8]iptcField{ | ||
0: {"RecordVersion", false, "B"}, | ||
5: {"ObjectName", false, "string"}, | ||
7: {"EditStatus", false, "string"}, | ||
10: {"Urgency", false, "B"}, | ||
15: {"Category", true, "string"}, | ||
20: {"SupplementalCategory", true, "string"}, | ||
22: {"FixtureIdentifier", false, "string"}, | ||
25: {"Keywords", true, "string"}, | ||
26: {"ContentLocationCode", false, "string"}, | ||
27: {"ContentLocationName", false, "string"}, | ||
30: {"ReleaseDate", false, "string"}, | ||
35: {"ReleaseTime", false, "string"}, | ||
37: {"ExpirationDate", false, "string"}, | ||
38: {"ExpirationTime", false, "string"}, | ||
40: {"SpecialInstructions", false, "string"}, | ||
42: {"ActionAdvised", false, "B"}, | ||
45: {"ReferenceService", false, "string"}, | ||
47: {"ReferenceDate", false, "string"}, | ||
50: {"ReferenceNumber", false, "string"}, | ||
55: {"DateCreated", false, "string"}, | ||
60: {"TimeCreated", false, "string"}, | ||
62: {"DigitalCreationDate", false, "string"}, | ||
63: {"DigitalCreationTime", false, "string"}, | ||
65: {"OriginatingProgram", false, "string"}, | ||
70: {"ProgramVersion", false, "string"}, | ||
75: {"ObjectCycle", false, "string"}, | ||
80: {"Byline", false, "string"}, | ||
85: {"BylineTitle", false, "string"}, | ||
90: {"City", false, "string"}, | ||
92: {"SubLocation", false, "string"}, | ||
95: {"ProvinceState", false, "string"}, | ||
100: {"CountryCode", false, "string"}, | ||
101: {"CountryName", false, "string"}, | ||
103: {"OriginalTransmissionReference", false, "string"}, | ||
105: {"Headline", false, "string"}, | ||
110: {"Credit", false, "string"}, | ||
115: {"Source", false, "string"}, | ||
116: {"Copyright", false, "string"}, | ||
118: {"Contact", false, "string"}, | ||
} | ||
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type iptcField struct { | ||
name string | ||
repeatable bool | ||
format string | ||
} |
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