mirror of https://github.com/dsoprea/go-exif.git
ifd: Implemented recursion. Refactored IFD seeking.
- tags.yaml: Uncommented previously-unhandleable tags.pull/3/head
Dustin Oprea
parent
34fb63841d
commit
172013e0f0
312
assets/tags.yaml
312
assets/tags.yaml
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@ -71,10 +71,9 @@ GPSInfo:
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name: GPSDateStamp
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- id: 0x001e
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name: GPSDifferential
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Image:
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# Conflicts with GPSDOP and may not even be official.
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#- id: 0x000b
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# name: ProcessingSoftware
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IFD:
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- id: 0x000b
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name: ProcessingSoftware
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- id: 0x00fe
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name: NewSubfileType
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- id: 0x00ff
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@ -483,158 +482,153 @@ Image:
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name: OpcodeList3
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- id: 0xc761
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name: NoiseProfile
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# Note sure about this. ExifTool doesn't recognize it and 0x0001 conflicts with GPSLatitudeRef.
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#
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# Iop:
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# - id: 0x0001
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# name: InteroperabilityIndex
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# - id: 0x0002
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# name: InteroperabilityVersion
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# - id: 0x1000
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# name: RelatedImageFileFormat
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# - id: 0x1001
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# name: RelatedImageWidth
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# - id: 0x1002
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# name: RelatedImageLength
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#
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# Aren't recognized by ExifTool nor the PDF documentation (included).
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#
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# Photo:
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# - id: 0x829a
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# name: ExposureTime
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# - id: 0x829d
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# name: FNumber
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# - id: 0x8822
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# name: ExposureProgram
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# - id: 0x8824
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# name: SpectralSensitivity
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# - id: 0x8827
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# name: ISOSpeedRatings
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# - id: 0x8828
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# name: OECF
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# - id: 0x8830
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# name: SensitivityType
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# - id: 0x8831
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# name: StandardOutputSensitivity
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# - id: 0x8832
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# name: RecommendedExposureIndex
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# - id: 0x8833
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# name: ISOSpeed
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# - id: 0x8834
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# name: ISOSpeedLatitudeyyy
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# - id: 0x8835
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# name: ISOSpeedLatitudezzz
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# - id: 0x9000
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# name: ExifVersion
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# - id: 0x9003
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# name: DateTimeOriginal
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# - id: 0x9004
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# name: DateTimeDigitized
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# - id: 0x9101
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# name: ComponentsConfiguration
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# - id: 0x9102
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# name: CompressedBitsPerPixel
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# - id: 0x9201
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# name: ShutterSpeedValue
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# - id: 0x9202
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# name: ApertureValue
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# - id: 0x9203
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# name: BrightnessValue
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# - id: 0x9204
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# name: ExposureBiasValue
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# - id: 0x9205
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# name: MaxApertureValue
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# - id: 0x9206
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# name: SubjectDistance
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# - id: 0x9207
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# name: MeteringMode
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# - id: 0x9208
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# name: LightSource
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# - id: 0x9209
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# name: Flash
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# - id: 0x920a
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# name: FocalLength
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# - id: 0x9214
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# name: SubjectArea
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# - id: 0x927c
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# name: MakerNote
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# - id: 0x9286
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# name: UserComment
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# - id: 0x9290
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# name: SubSecTime
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# - id: 0x9291
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# name: SubSecTimeOriginal
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# - id: 0x9292
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# name: SubSecTimeDigitized
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# - id: 0xa000
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# name: FlashpixVersion
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# - id: 0xa001
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# name: ColorSpace
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# - id: 0xa002
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# name: PixelXDimension
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# - id: 0xa003
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# name: PixelYDimension
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# - id: 0xa004
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# name: RelatedSoundFile
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# - id: 0xa005
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# name: InteroperabilityTag
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# - id: 0xa20b
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# name: FlashEnergy
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# - id: 0xa20c
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# name: SpatialFrequencyResponse
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# - id: 0xa20e
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# name: FocalPlaneXResolution
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# - id: 0xa20f
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# name: FocalPlaneYResolution
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# - id: 0xa210
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# name: FocalPlaneResolutionUnit
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# - id: 0xa214
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# name: SubjectLocation
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# - id: 0xa215
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# name: ExposureIndex
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# - id: 0xa217
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# name: SensingMethod
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# - id: 0xa300
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# name: FileSource
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# - id: 0xa301
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# name: SceneType
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# - id: 0xa302
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# name: CFAPattern
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# - id: 0xa401
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# name: CustomRendered
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# - id: 0xa402
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# name: ExposureMode
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# - id: 0xa403
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# name: WhiteBalance
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# - id: 0xa404
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# name: DigitalZoomRatio
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# - id: 0xa405
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# name: FocalLengthIn35mmFilm
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# - id: 0xa406
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# name: SceneCaptureType
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# - id: 0xa407
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# name: GainControl
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# - id: 0xa408
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# name: Contrast
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# - id: 0xa409
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# name: Saturation
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# - id: 0xa40a
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# name: Sharpness
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# - id: 0xa40b
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# name: DeviceSettingDescription
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# - id: 0xa40c
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# name: SubjectDistanceRange
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# - id: 0xa420
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# name: ImageUniqueID
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# - id: 0xa430
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# name: CameraOwnerName
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# - id: 0xa431
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# name: BodySerialNumber
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# - id: 0xa432
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# name: LensSpecification
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# - id: 0xa433
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# name: LensMake
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# - id: 0xa434
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# name: LensModel
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# - id: 0xa435
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# name: LensSerialNumber
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Iop:
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- id: 0x0001
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name: InteroperabilityIndex
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- id: 0x0002
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name: InteroperabilityVersion
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- id: 0x1000
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name: RelatedImageFileFormat
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- id: 0x1001
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name: RelatedImageWidth
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- id: 0x1002
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name: RelatedImageLength
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Exif:
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- id: 0x829a
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name: ExposureTime
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- id: 0x829d
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name: FNumber
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- id: 0x8822
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name: ExposureProgram
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- id: 0x8824
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name: SpectralSensitivity
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- id: 0x8827
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name: ISOSpeedRatings
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- id: 0x8828
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name: OECF
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- id: 0x8830
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name: SensitivityType
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- id: 0x8831
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name: StandardOutputSensitivity
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- id: 0x8832
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name: RecommendedExposureIndex
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- id: 0x8833
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name: ISOSpeed
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- id: 0x8834
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name: ISOSpeedLatitudeyyy
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- id: 0x8835
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name: ISOSpeedLatitudezzz
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- id: 0x9000
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name: ExifVersion
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- id: 0x9003
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name: DateTimeOriginal
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- id: 0x9004
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name: DateTimeDigitized
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- id: 0x9101
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name: ComponentsConfiguration
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- id: 0x9102
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name: CompressedBitsPerPixel
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- id: 0x9201
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name: ShutterSpeedValue
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- id: 0x9202
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name: ApertureValue
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- id: 0x9203
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name: BrightnessValue
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- id: 0x9204
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name: ExposureBiasValue
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- id: 0x9205
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name: MaxApertureValue
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- id: 0x9206
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name: SubjectDistance
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- id: 0x9207
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name: MeteringMode
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- id: 0x9208
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name: LightSource
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- id: 0x9209
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name: Flash
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- id: 0x920a
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name: FocalLength
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- id: 0x9214
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name: SubjectArea
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- id: 0x927c
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name: MakerNote
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- id: 0x9286
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name: UserComment
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- id: 0x9290
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name: SubSecTime
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- id: 0x9291
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name: SubSecTimeOriginal
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- id: 0x9292
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name: SubSecTimeDigitized
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- id: 0xa000
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name: FlashpixVersion
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- id: 0xa001
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name: ColorSpace
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- id: 0xa002
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name: PixelXDimension
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- id: 0xa003
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name: PixelYDimension
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- id: 0xa004
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name: RelatedSoundFile
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- id: 0xa005
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name: InteroperabilityTag
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- id: 0xa20b
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name: FlashEnergy
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- id: 0xa20c
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name: SpatialFrequencyResponse
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- id: 0xa20e
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name: FocalPlaneXResolution
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- id: 0xa20f
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name: FocalPlaneYResolution
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- id: 0xa210
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name: FocalPlaneResolutionUnit
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- id: 0xa214
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name: SubjectLocation
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- id: 0xa215
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name: ExposureIndex
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- id: 0xa217
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name: SensingMethod
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- id: 0xa300
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name: FileSource
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- id: 0xa301
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name: SceneType
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- id: 0xa302
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name: CFAPattern
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- id: 0xa401
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name: CustomRendered
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- id: 0xa402
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name: ExposureMode
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- id: 0xa403
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name: WhiteBalance
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- id: 0xa404
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name: DigitalZoomRatio
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- id: 0xa405
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name: FocalLengthIn35mmFilm
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- id: 0xa406
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name: SceneCaptureType
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- id: 0xa407
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name: GainControl
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- id: 0xa408
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name: Contrast
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- id: 0xa409
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name: Saturation
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- id: 0xa40a
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name: Sharpness
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- id: 0xa40b
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name: DeviceSettingDescription
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- id: 0xa40c
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name: SubjectDistanceRange
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- id: 0xa420
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name: ImageUniqueID
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- id: 0xa430
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name: CameraOwnerName
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- id: 0xa431
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name: BodySerialNumber
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- id: 0xa432
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name: LensSpecification
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- id: 0xa433
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name: LensMake
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- id: 0xa434
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name: LensModel
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- id: 0xa435
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name: LensSerialNumber
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2
exif.go
2
exif.go
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@ -69,7 +69,7 @@ func (e *Exif) Parse(data []byte, visitor TagVisitor) (err error) {
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ifd := NewIfd(data, byteOrder)
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err = ifd.Scan(visitor, firstIfdOffset)
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err = ifd.Scan(IfdStandard, firstIfdOffset, visitor)
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log.PanicIf(err)
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return nil
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101
exif_test.go
101
exif_test.go
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@ -34,6 +34,13 @@ func TestIsExif_False(t *testing.T) {
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}
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func TestParse(t *testing.T) {
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defer func() {
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if state := recover(); state != nil {
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err := log.Wrap(state.(error))
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log.PrintErrorf(err, "Exif failure.")
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}
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}()
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// Open the file.
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filepath := path.Join(assetsPath, "NDM_8901.jpg")
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@ -67,7 +74,7 @@ func TestParse(t *testing.T) {
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ti := NewTagIndex()
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tags := make([]string, 0)
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visitor := func(tagId uint16, tagType TagType, valueContext ValueContext) (err error) {
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visitor := func(indexedIfdName string, tagId uint16, tagType TagType, valueContext ValueContext) (err error) {
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defer func() {
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if state := recover(); state != nil {
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err = log.Wrap(state.(error))
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@ -75,19 +82,26 @@ func TestParse(t *testing.T) {
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}
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}()
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it, err := ti.GetWithTagId(tagId)
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it, err := ti.Get(indexedIfdName, tagId)
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if err != nil {
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if err == ErrTagNotFound {
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if log.Is(err, ErrTagNotFound) {
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fmt.Printf("Unknown tag: [%s] (%04x)\n", indexedIfdName, tagId)
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return nil
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} else {
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log.Panic(err)
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}
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}
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valueString, err := tagType.ValueString(valueContext, true)
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// TODO(dustin): Finish case-specific parsing of known undefined values.
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valueString := ""
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if tagType.Type() == TypeUndefined {
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valueString = "!UNDEFINED!"
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} else {
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valueString, err = tagType.ValueString(valueContext, true)
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log.PanicIf(err)
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}
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description := fmt.Sprintf("ID=(0x%04x) NAME=[%s] IFD=[%s] COUNT=(%d) TYPE=[%s] VALUE=[%s]", tagId, it.Name, it.Ifd, valueContext.UnitCount, tagType.Name(), valueString)
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description := fmt.Sprintf("IFD=[%s] ID=(0x%04x) NAME=[%s] COUNT=(%d) TYPE=[%s] VALUE=[%s]", indexedIfdName, tagId, it.Name, valueContext.UnitCount, tagType.Name(), valueString)
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tags = append(tags, description)
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return nil
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@ -97,24 +111,65 @@ func TestParse(t *testing.T) {
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log.PanicIf(err)
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expected := []string {
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"ID=(0x010f) NAME=[Make] IFD=[Image] COUNT=(6) TYPE=[ASCII] VALUE=[Canon]",
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"ID=(0x0110) NAME=[Model] IFD=[Image] COUNT=(22) TYPE=[ASCII] VALUE=[Canon EOS 5D Mark III]",
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"ID=(0x0112) NAME=[Orientation] IFD=[Image] COUNT=(1) TYPE=[SHORT] VALUE=[1]",
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"ID=(0x011a) NAME=[XResolution] IFD=[Image] COUNT=(1) TYPE=[RATIONAL] VALUE=[72/1]",
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"ID=(0x011b) NAME=[YResolution] IFD=[Image] COUNT=(1) TYPE=[RATIONAL] VALUE=[72/1]",
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"ID=(0x0128) NAME=[ResolutionUnit] IFD=[Image] COUNT=(1) TYPE=[SHORT] VALUE=[2]",
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"ID=(0x0132) NAME=[DateTime] IFD=[Image] COUNT=(20) TYPE=[ASCII] VALUE=[2017:12:02 08:18:50]",
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"ID=(0x013b) NAME=[Artist] IFD=[Image] COUNT=(1) TYPE=[ASCII] VALUE=[]",
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"ID=(0x0213) NAME=[YCbCrPositioning] IFD=[Image] COUNT=(1) TYPE=[SHORT] VALUE=[2]",
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"ID=(0x8298) NAME=[Copyright] IFD=[Image] COUNT=(1) TYPE=[ASCII] VALUE=[]",
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"ID=(0x8769) NAME=[ExifTag] IFD=[Image] COUNT=(1) TYPE=[LONG] VALUE=[360]",
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"ID=(0x8825) NAME=[GPSTag] IFD=[Image] COUNT=(1) TYPE=[LONG] VALUE=[9554]",
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"ID=(0x0103) NAME=[Compression] IFD=[Image] COUNT=(1) TYPE=[SHORT] VALUE=[6]",
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"ID=(0x011a) NAME=[XResolution] IFD=[Image] COUNT=(1) TYPE=[RATIONAL] VALUE=[72/1]",
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"ID=(0x011b) NAME=[YResolution] IFD=[Image] COUNT=(1) TYPE=[RATIONAL] VALUE=[72/1]",
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"ID=(0x0128) NAME=[ResolutionUnit] IFD=[Image] COUNT=(1) TYPE=[SHORT] VALUE=[2]",
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"ID=(0x0201) NAME=[JPEGInterchangeFormat] IFD=[Image] COUNT=(1) TYPE=[LONG] VALUE=[11444]",
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"ID=(0x0202) NAME=[JPEGInterchangeFormatLength] IFD=[Image] COUNT=(1) TYPE=[LONG] VALUE=[21491]",
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"IFD=[IFD] ID=(0x010f) NAME=[Make] COUNT=(6) TYPE=[ASCII] VALUE=[Canon]",
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"IFD=[IFD] ID=(0x0110) NAME=[Model] COUNT=(22) TYPE=[ASCII] VALUE=[Canon EOS 5D Mark III]",
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"IFD=[IFD] ID=(0x0112) NAME=[Orientation] COUNT=(1) TYPE=[SHORT] VALUE=[1]",
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"IFD=[IFD] ID=(0x011a) NAME=[XResolution] COUNT=(1) TYPE=[RATIONAL] VALUE=[72/1]",
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"IFD=[IFD] ID=(0x011b) NAME=[YResolution] COUNT=(1) TYPE=[RATIONAL] VALUE=[72/1]",
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"IFD=[IFD] ID=(0x0128) NAME=[ResolutionUnit] COUNT=(1) TYPE=[SHORT] VALUE=[2]",
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"IFD=[IFD] ID=(0x0132) NAME=[DateTime] COUNT=(20) TYPE=[ASCII] VALUE=[2017:12:02 08:18:50]",
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"IFD=[IFD] ID=(0x013b) NAME=[Artist] COUNT=(1) TYPE=[ASCII] VALUE=[]",
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"IFD=[IFD] ID=(0x0213) NAME=[YCbCrPositioning] COUNT=(1) TYPE=[SHORT] VALUE=[2]",
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"IFD=[IFD] ID=(0x8298) NAME=[Copyright] COUNT=(1) TYPE=[ASCII] VALUE=[]",
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"IFD=[IFD] ID=(0x8769) NAME=[ExifTag] COUNT=(1) TYPE=[LONG] VALUE=[360]",
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"IFD=[Exif] ID=(0x829a) NAME=[ExposureTime] COUNT=(1) TYPE=[RATIONAL] VALUE=[1/640]",
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"IFD=[Exif] ID=(0x829d) NAME=[FNumber] COUNT=(1) TYPE=[RATIONAL] VALUE=[4/1]",
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"IFD=[Exif] ID=(0x8822) NAME=[ExposureProgram] COUNT=(1) TYPE=[SHORT] VALUE=[4]",
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"IFD=[Exif] ID=(0x8827) NAME=[ISOSpeedRatings] COUNT=(1) TYPE=[SHORT] VALUE=[1600]",
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"IFD=[Exif] ID=(0x8830) NAME=[SensitivityType] COUNT=(1) TYPE=[SHORT] VALUE=[2]",
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"IFD=[Exif] ID=(0x8832) NAME=[RecommendedExposureIndex] COUNT=(1) TYPE=[LONG] VALUE=[1600]",
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"IFD=[Exif] ID=(0x9000) NAME=[ExifVersion] COUNT=(4) TYPE=[UNDEFINED] VALUE=[!UNDEFINED!]",
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"IFD=[Exif] ID=(0x9003) NAME=[DateTimeOriginal] COUNT=(20) TYPE=[ASCII] VALUE=[2017:12:02 08:18:50]",
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"IFD=[Exif] ID=(0x9004) NAME=[DateTimeDigitized] COUNT=(20) TYPE=[ASCII] VALUE=[2017:12:02 08:18:50]",
|
||||
"IFD=[Exif] ID=(0x9101) NAME=[ComponentsConfiguration] COUNT=(4) TYPE=[UNDEFINED] VALUE=[!UNDEFINED!]",
|
||||
"IFD=[Exif] ID=(0x9201) NAME=[ShutterSpeedValue] COUNT=(1) TYPE=[SRATIONAL] VALUE=[614400/65536]",
|
||||
"IFD=[Exif] ID=(0x9202) NAME=[ApertureValue] COUNT=(1) TYPE=[RATIONAL] VALUE=[262144/65536]",
|
||||
"IFD=[Exif] ID=(0x9204) NAME=[ExposureBiasValue] COUNT=(1) TYPE=[SRATIONAL] VALUE=[0/1]",
|
||||
"IFD=[Exif] ID=(0x9207) NAME=[MeteringMode] COUNT=(1) TYPE=[SHORT] VALUE=[5]",
|
||||
"IFD=[Exif] ID=(0x9209) NAME=[Flash] COUNT=(1) TYPE=[SHORT] VALUE=[16]",
|
||||
"IFD=[Exif] ID=(0x920a) NAME=[FocalLength] COUNT=(1) TYPE=[RATIONAL] VALUE=[16/1]",
|
||||
"IFD=[Exif] ID=(0x927c) NAME=[MakerNote] COUNT=(8152) TYPE=[UNDEFINED] VALUE=[!UNDEFINED!]",
|
||||
"IFD=[Exif] ID=(0x9286) NAME=[UserComment] COUNT=(264) TYPE=[UNDEFINED] VALUE=[!UNDEFINED!]",
|
||||
"IFD=[Exif] ID=(0x9290) NAME=[SubSecTime] COUNT=(3) TYPE=[ASCII] VALUE=[00]",
|
||||
"IFD=[Exif] ID=(0x9291) NAME=[SubSecTimeOriginal] COUNT=(3) TYPE=[ASCII] VALUE=[00]",
|
||||
"IFD=[Exif] ID=(0x9292) NAME=[SubSecTimeDigitized] COUNT=(3) TYPE=[ASCII] VALUE=[00]",
|
||||
"IFD=[Exif] ID=(0xa000) NAME=[FlashpixVersion] COUNT=(4) TYPE=[UNDEFINED] VALUE=[!UNDEFINED!]",
|
||||
"IFD=[Exif] ID=(0xa001) NAME=[ColorSpace] COUNT=(1) TYPE=[SHORT] VALUE=[1]",
|
||||
"IFD=[Exif] ID=(0xa002) NAME=[PixelXDimension] COUNT=(1) TYPE=[SHORT] VALUE=[3840]",
|
||||
"IFD=[Exif] ID=(0xa003) NAME=[PixelYDimension] COUNT=(1) TYPE=[SHORT] VALUE=[2560]",
|
||||
"IFD=[Exif] ID=(0xa005) NAME=[InteroperabilityTag] COUNT=(1) TYPE=[LONG] VALUE=[9326]",
|
||||
"IFD=[Iop] ID=(0x0001) NAME=[InteroperabilityIndex] COUNT=(4) TYPE=[ASCII] VALUE=[R98]",
|
||||
"IFD=[Iop] ID=(0x0002) NAME=[InteroperabilityVersion] COUNT=(4) TYPE=[UNDEFINED] VALUE=[!UNDEFINED!]",
|
||||
"IFD=[Exif] ID=(0xa20e) NAME=[FocalPlaneXResolution] COUNT=(1) TYPE=[RATIONAL] VALUE=[3840000/1461]",
|
||||
"IFD=[Exif] ID=(0xa20f) NAME=[FocalPlaneYResolution] COUNT=(1) TYPE=[RATIONAL] VALUE=[2560000/972]",
|
||||
"IFD=[Exif] ID=(0xa210) NAME=[FocalPlaneResolutionUnit] COUNT=(1) TYPE=[SHORT] VALUE=[2]",
|
||||
"IFD=[Exif] ID=(0xa401) NAME=[CustomRendered] COUNT=(1) TYPE=[SHORT] VALUE=[0]",
|
||||
"IFD=[Exif] ID=(0xa402) NAME=[ExposureMode] COUNT=(1) TYPE=[SHORT] VALUE=[0]",
|
||||
"IFD=[Exif] ID=(0xa403) NAME=[WhiteBalance] COUNT=(1) TYPE=[SHORT] VALUE=[0]",
|
||||
"IFD=[Exif] ID=(0xa406) NAME=[SceneCaptureType] COUNT=(1) TYPE=[SHORT] VALUE=[0]",
|
||||
"IFD=[Exif] ID=(0xa430) NAME=[CameraOwnerName] COUNT=(1) TYPE=[ASCII] VALUE=[]",
|
||||
"IFD=[Exif] ID=(0xa431) NAME=[BodySerialNumber] COUNT=(13) TYPE=[ASCII] VALUE=[063024020097]",
|
||||
"IFD=[Exif] ID=(0xa432) NAME=[LensSpecification] COUNT=(4) TYPE=[RATIONAL] VALUE=[16/1]",
|
||||
"IFD=[Exif] ID=(0xa434) NAME=[LensModel] COUNT=(22) TYPE=[ASCII] VALUE=[EF16-35mm f/4L IS USM]",
|
||||
"IFD=[Exif] ID=(0xa435) NAME=[LensSerialNumber] COUNT=(11) TYPE=[ASCII] VALUE=[2400001068]",
|
||||
"IFD=[IFD] ID=(0x8825) NAME=[GPSTag] COUNT=(1) TYPE=[LONG] VALUE=[9554]",
|
||||
"IFD=[GPSInfo] ID=(0x0000) NAME=[GPSVersionID] COUNT=(4) TYPE=[BYTE] VALUE=[2]",
|
||||
"IFD=[IFD] ID=(0x0103) NAME=[Compression] COUNT=(1) TYPE=[SHORT] VALUE=[6]",
|
||||
"IFD=[IFD] ID=(0x011a) NAME=[XResolution] COUNT=(1) TYPE=[RATIONAL] VALUE=[72/1]",
|
||||
"IFD=[IFD] ID=(0x011b) NAME=[YResolution] COUNT=(1) TYPE=[RATIONAL] VALUE=[72/1]",
|
||||
"IFD=[IFD] ID=(0x0128) NAME=[ResolutionUnit] COUNT=(1) TYPE=[SHORT] VALUE=[2]",
|
||||
"IFD=[IFD] ID=(0x0201) NAME=[JPEGInterchangeFormat] COUNT=(1) TYPE=[LONG] VALUE=[11444]",
|
||||
"IFD=[IFD] ID=(0x0202) NAME=[JPEGInterchangeFormatLength] COUNT=(1) TYPE=[LONG] VALUE=[21491]",
|
||||
}
|
||||
|
||||
if reflect.DeepEqual(tags, expected) == false {
|
||||
|
|
|
|||
230
ifd.go
230
ifd.go
|
|
@ -2,7 +2,6 @@ package exif
|
|||
|
||||
import (
|
||||
"bytes"
|
||||
"io"
|
||||
|
||||
"encoding/binary"
|
||||
|
||||
|
|
@ -14,6 +13,77 @@ var (
|
|||
)
|
||||
|
||||
|
||||
// IfdTagEnumerator knows how to decode an IFD and all of the tags it
|
||||
// describes. Note that the IFDs and the actual values floating throughout the
|
||||
// whole EXIF block, but the IFD itself has just a minor header and a set of
|
||||
// repeating, statically-sized records. So, the tags (though not their values)
|
||||
// are fairly simple to enumerate.
|
||||
type IfdTagEnumerator struct {
|
||||
byteOrder IfdByteOrder
|
||||
rawExif []byte
|
||||
ifdOffset uint32
|
||||
buffer *bytes.Buffer
|
||||
}
|
||||
|
||||
func NewIfdTagEnumerator(rawExif []byte, byteOrder IfdByteOrder, ifdOffset uint32) (ite *IfdTagEnumerator) {
|
||||
ite = &IfdTagEnumerator{
|
||||
rawExif: rawExif,
|
||||
byteOrder: byteOrder,
|
||||
buffer: bytes.NewBuffer(rawExif[ifdOffset:]),
|
||||
}
|
||||
|
||||
return ite
|
||||
}
|
||||
|
||||
// getUint16 reads a uint16 and advances both our current and our current
|
||||
// accumulator (which allows us to know how far to seek to the beginning of the
|
||||
// next IFD when it's time to jump).
|
||||
func (ife *IfdTagEnumerator) getUint16() (value uint16, raw []byte, err error) {
|
||||
defer func() {
|
||||
if state := recover(); state != nil {
|
||||
err = log.Wrap(state.(error))
|
||||
}
|
||||
}()
|
||||
|
||||
raw = make([]byte, 2)
|
||||
|
||||
_, err = ife.buffer.Read(raw)
|
||||
log.PanicIf(err)
|
||||
|
||||
if ife.byteOrder.IsLittleEndian() == true {
|
||||
value = binary.LittleEndian.Uint16(raw)
|
||||
} else {
|
||||
value = binary.BigEndian.Uint16(raw)
|
||||
}
|
||||
|
||||
return value, raw, nil
|
||||
}
|
||||
|
||||
// getUint32 reads a uint32 and advances both our current and our current
|
||||
// accumulator (which allows us to know how far to seek to the beginning of the
|
||||
// next IFD when it's time to jump).
|
||||
func (ife *IfdTagEnumerator) getUint32() (value uint32, raw []byte, err error) {
|
||||
defer func() {
|
||||
if state := recover(); state != nil {
|
||||
err = log.Wrap(state.(error))
|
||||
}
|
||||
}()
|
||||
|
||||
raw = make([]byte, 4)
|
||||
|
||||
_, err = ife.buffer.Read(raw)
|
||||
log.PanicIf(err)
|
||||
|
||||
if ife.byteOrder.IsLittleEndian() == true {
|
||||
value = binary.LittleEndian.Uint32(raw)
|
||||
} else {
|
||||
value = binary.BigEndian.Uint32(raw)
|
||||
}
|
||||
|
||||
return value, raw, nil
|
||||
}
|
||||
|
||||
|
||||
type Ifd struct {
|
||||
data []byte
|
||||
buffer *bytes.Buffer
|
||||
|
|
@ -31,70 +101,6 @@ func NewIfd(data []byte, byteOrder IfdByteOrder) *Ifd {
|
|||
}
|
||||
}
|
||||
|
||||
// read is a wrapper around the built-in reader that applies which endianness
|
||||
// we are.
|
||||
func (ifd *Ifd) read(r io.Reader, into interface{}) (err error) {
|
||||
defer func() {
|
||||
if state := recover(); state != nil {
|
||||
err = log.Wrap(state.(error))
|
||||
}
|
||||
}()
|
||||
|
||||
if ifd.byteOrder.IsLittleEndian() == true {
|
||||
err := binary.Read(r, binary.LittleEndian, into)
|
||||
log.PanicIf(err)
|
||||
} else {
|
||||
err := binary.Read(r, binary.BigEndian, into)
|
||||
log.PanicIf(err)
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// getUint16 reads a uint16 and advances both our current and our current
|
||||
// accumulator (which allows us to know how far to seek to the beginning of the
|
||||
// next IFD when it's time to jump).
|
||||
func (ifd *Ifd) getUint16() (value uint16, err error) {
|
||||
defer func() {
|
||||
if state := recover(); state != nil {
|
||||
err = log.Wrap(state.(error))
|
||||
}
|
||||
}()
|
||||
|
||||
err = ifd.read(ifd.buffer, &value)
|
||||
log.PanicIf(err)
|
||||
|
||||
ifd.currentOffset += 2
|
||||
|
||||
return value, nil
|
||||
}
|
||||
|
||||
// getUint32 reads a uint32 and advances both our current and our current
|
||||
// accumulator (which allows us to know how far to seek to the beginning of the
|
||||
// next IFD when it's time to jump).
|
||||
func (ifd *Ifd) getUint32() (value uint32, raw []byte, err error) {
|
||||
defer func() {
|
||||
if state := recover(); state != nil {
|
||||
err = log.Wrap(state.(error))
|
||||
}
|
||||
}()
|
||||
|
||||
raw = make([]byte, 4)
|
||||
|
||||
_, err = ifd.buffer.Read(raw)
|
||||
log.PanicIf(err)
|
||||
|
||||
ifd.currentOffset += 4
|
||||
|
||||
if ifd.byteOrder.IsBigEndian() {
|
||||
value = binary.BigEndian.Uint32(raw)
|
||||
} else {
|
||||
value = binary.LittleEndian.Uint32(raw)
|
||||
}
|
||||
|
||||
return value, raw, nil
|
||||
}
|
||||
|
||||
// ValueContext describes all of the parameters required to find and extract
|
||||
// the actual tag value.
|
||||
type ValueContext struct {
|
||||
|
|
@ -104,44 +110,65 @@ type ValueContext struct {
|
|||
RawExif []byte
|
||||
}
|
||||
|
||||
func (ifd *Ifd) getTagEnumerator(ifdOffset uint32) (ite *IfdTagEnumerator) {
|
||||
ite = NewIfdTagEnumerator(
|
||||
ifd.data[ifd.ifdTopOffset:],
|
||||
ifd.byteOrder,
|
||||
ifdOffset)
|
||||
|
||||
return ite
|
||||
}
|
||||
|
||||
// TagVisitor is an optional callback that can get hit for every tag we parse
|
||||
// through. `rawExif` is the byte array startign after the EXIF header (where
|
||||
// the offsets of all IFDs and values are calculated from).
|
||||
type TagVisitor func(tagId uint16, tagType TagType, valueContext ValueContext) (err error)
|
||||
type TagVisitor func(indexedIfdName string, tagId uint16, tagType TagType, valueContext ValueContext) (err error)
|
||||
|
||||
// parseCurrentIfd decodes the IFD block that we're currently sitting on the
|
||||
// first byte of.
|
||||
func (ifd *Ifd) parseCurrentIfd(visitor TagVisitor) (nextIfdOffset uint32, err error) {
|
||||
// parseIfd decodes the IFD block that we're currently sitting on the first
|
||||
// byte of.
|
||||
func (ifd *Ifd) parseIfd(ifdName string, ifdIndex int, ifdOffset uint32, visitor TagVisitor) (nextIfdOffset uint32, err error) {
|
||||
defer func() {
|
||||
if state := recover(); state != nil {
|
||||
err = log.Wrap(state.(error))
|
||||
}
|
||||
}()
|
||||
|
||||
ifdLogger.Debugf(nil, "Parsing IFD [%s] (%d) at offset (%04x).", ifdName, ifdIndex, ifdOffset)
|
||||
|
||||
tagCount, err := ifd.getUint16()
|
||||
// Return the name of the IFD as its known in our tag-index. We should skip
|
||||
// over the current IFD if this is empty (which means we don't recognize/
|
||||
// understand the IFD and, therefore, don't know the tags that are valid for
|
||||
// it). Note that we could leave ignoring the tags as a responsibility for
|
||||
// the visitor, but then it'd be easy for people to integrate that logic and
|
||||
// not realize that they needed to specially handle an empty IFD name until
|
||||
// they happened upon some obscure media one day and suddenly have issue if
|
||||
// they unwittingly write something that breaks in that situation.
|
||||
indexedIfdName := IfdName(ifdName, ifdIndex)
|
||||
if indexedIfdName == "" {
|
||||
ifdLogger.Debugf(nil, "IFD not known and will not be visited: [%s] (%d)", ifdName, ifdIndex)
|
||||
}
|
||||
|
||||
ite := ifd.getTagEnumerator(ifdOffset)
|
||||
|
||||
tagCount, _, err := ite.getUint16()
|
||||
log.PanicIf(err)
|
||||
|
||||
ifdLogger.Debugf(nil, "Current IFD tag-count: (%d)", tagCount)
|
||||
|
||||
for i := uint16(0); i < tagCount; i++ {
|
||||
|
||||
// TODO(dustin): !! 0x8769 tag-IDs are child IFDs. We need to be able to recurse.
|
||||
|
||||
tagId, err := ifd.getUint16()
|
||||
tagId, _, err := ite.getUint16()
|
||||
log.PanicIf(err)
|
||||
|
||||
tagType, err := ifd.getUint16()
|
||||
tagType, _, err := ite.getUint16()
|
||||
log.PanicIf(err)
|
||||
|
||||
unitCount, _, err := ifd.getUint32()
|
||||
unitCount, _, err := ite.getUint32()
|
||||
log.PanicIf(err)
|
||||
|
||||
valueOffset, rawValueOffset, err := ifd.getUint32()
|
||||
valueOffset, rawValueOffset, err := ite.getUint32()
|
||||
log.PanicIf(err)
|
||||
|
||||
if visitor != nil {
|
||||
if visitor != nil && indexedIfdName != "" {
|
||||
tt := NewTagType(tagType, ifd.byteOrder)
|
||||
|
||||
vc := ValueContext{
|
||||
|
|
@ -151,12 +178,20 @@ func (ifd *Ifd) parseCurrentIfd(visitor TagVisitor) (nextIfdOffset uint32, err e
|
|||
RawExif: ifd.data[ifd.ifdTopOffset:],
|
||||
}
|
||||
|
||||
err := visitor(tagId, tt, vc)
|
||||
err := visitor(indexedIfdName, tagId, tt, vc)
|
||||
log.PanicIf(err)
|
||||
}
|
||||
|
||||
childIfdName, isIfd := IsIfdTag(tagId)
|
||||
if isIfd == true {
|
||||
ifdLogger.Debugf(nil, "Descending to IFD [%s].", childIfdName)
|
||||
|
||||
err := ifd.Scan(childIfdName, valueOffset, visitor)
|
||||
log.PanicIf(err)
|
||||
}
|
||||
}
|
||||
|
||||
nextIfdOffset, _, err = ifd.getUint32()
|
||||
nextIfdOffset, _, err = ite.getUint32()
|
||||
log.PanicIf(err)
|
||||
|
||||
ifdLogger.Debugf(nil, "Next IFD at offset: (%08x)", nextIfdOffset)
|
||||
|
|
@ -164,50 +199,23 @@ func (ifd *Ifd) parseCurrentIfd(visitor TagVisitor) (nextIfdOffset uint32, err e
|
|||
return nextIfdOffset, nil
|
||||
}
|
||||
|
||||
// forwardToIfd jumps to the beginning of an IFD block that starts on or after
|
||||
// the current position.
|
||||
func (ifd *Ifd) forwardToIfd(ifdOffset uint32) (err error) {
|
||||
defer func() {
|
||||
if state := recover(); state != nil {
|
||||
err = log.Wrap(state.(error))
|
||||
}
|
||||
}()
|
||||
|
||||
ifdLogger.Debugf(nil, "Forwarding to IFD. TOP-OFFSET=(%d) IFD-OFFSET=(%d)", ifd.ifdTopOffset, ifdOffset)
|
||||
|
||||
nextOffset := ifd.ifdTopOffset + ifdOffset
|
||||
|
||||
// We're assuming the guarantee that the next IFD will follow the
|
||||
// current one. So, figure out how far it is from our current position.
|
||||
delta := nextOffset - ifd.currentOffset
|
||||
ifd.buffer.Next(int(delta))
|
||||
|
||||
ifd.currentOffset = nextOffset
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// Scan enumerates the different EXIF blocks (called IFDs).
|
||||
func (ifd *Ifd) Scan(visitor TagVisitor, firstIfdOffset uint32) (err error) {
|
||||
func (ifd *Ifd) Scan(ifdName string, ifdOffset uint32, visitor TagVisitor) (err error) {
|
||||
defer func() {
|
||||
if state := recover(); state != nil {
|
||||
err = log.Wrap(state.(error))
|
||||
}
|
||||
}()
|
||||
|
||||
err = ifd.forwardToIfd(firstIfdOffset)
|
||||
log.PanicIf(err)
|
||||
|
||||
for {
|
||||
nextIfdOffset, err := ifd.parseCurrentIfd(visitor)
|
||||
for ifdIndex := 0;; ifdIndex++ {
|
||||
nextIfdOffset, err := ifd.parseIfd(ifdName, ifdIndex, ifdOffset, visitor)
|
||||
log.PanicIf(err)
|
||||
|
||||
if nextIfdOffset == 0 {
|
||||
break
|
||||
}
|
||||
|
||||
err = ifd.forwardToIfd(nextIfdOffset)
|
||||
log.PanicIf(err)
|
||||
ifdOffset = nextIfdOffset
|
||||
}
|
||||
|
||||
return nil
|
||||
|
|
|
|||
57
tags.go
57
tags.go
|
|
@ -10,8 +10,21 @@ import (
|
|||
"github.com/dsoprea/go-logging"
|
||||
)
|
||||
|
||||
const (
|
||||
IfdStandard = "IFD"
|
||||
IfdExif = "Exif"
|
||||
IfdGps = "GPSInfo"
|
||||
IfdIop = "Iop"
|
||||
)
|
||||
|
||||
var (
|
||||
tagDataFilepath = ""
|
||||
|
||||
IfdTags = map[uint16]string {
|
||||
0x8769: IfdExif,
|
||||
0x8825: IfdGps,
|
||||
0xA005: IfdIop,
|
||||
}
|
||||
)
|
||||
|
||||
var (
|
||||
|
|
@ -52,7 +65,6 @@ func (it IndexedTag) Is(id uint16) bool {
|
|||
|
||||
type TagIndex struct {
|
||||
tagsByIfd map[string]map[uint16]*IndexedTag
|
||||
tagsById map[uint16]*IndexedTag
|
||||
}
|
||||
|
||||
func NewTagIndex() *TagIndex {
|
||||
|
|
@ -87,7 +99,6 @@ func (ti *TagIndex) load() (err error) {
|
|||
|
||||
// Load structure.
|
||||
|
||||
tagsById := make(map[uint16]*IndexedTag)
|
||||
tagsByIfd := make(map[string]map[uint16]*IndexedTag)
|
||||
|
||||
count := 0
|
||||
|
|
@ -102,25 +113,22 @@ func (ti *TagIndex) load() (err error) {
|
|||
Name: tagName,
|
||||
}
|
||||
|
||||
if _, found := tagsById[tagId]; found == true {
|
||||
log.Panicf("tag-ID defined more than once: (%02x)", tagId)
|
||||
}
|
||||
|
||||
tagsById[tagId] = tag
|
||||
|
||||
family, found := tagsByIfd[ifdName]
|
||||
if found == false {
|
||||
family = make(map[uint16]*IndexedTag)
|
||||
tagsByIfd[ifdName] = family
|
||||
}
|
||||
|
||||
if _, found := family[tagId]; found == true {
|
||||
log.Panicf("tag-ID defined more than once for IFD [%s]: (%02x)", ifdName, tagId)
|
||||
}
|
||||
|
||||
family[tagId] = tag
|
||||
|
||||
count++
|
||||
}
|
||||
}
|
||||
|
||||
ti.tagsById = tagsById
|
||||
ti.tagsByIfd = tagsByIfd
|
||||
|
||||
tagsLogger.Debugf(nil, "(%d) tags loaded.", count)
|
||||
|
|
@ -128,14 +136,19 @@ func (ti *TagIndex) load() (err error) {
|
|||
return nil
|
||||
}
|
||||
|
||||
func (ti *TagIndex) GetWithTagId(id uint16) (it *IndexedTag, err error) {
|
||||
func (ti *TagIndex) Get(ifdName string, id uint16) (it *IndexedTag, err error) {
|
||||
defer func() {
|
||||
if state := recover(); state != nil {
|
||||
err = log.Wrap(state.(error))
|
||||
}
|
||||
}()
|
||||
|
||||
it, found := ti.tagsById[id]
|
||||
family, found := ti.tagsByIfd[ifdName]
|
||||
if found == false {
|
||||
log.Panic(ErrTagNotFound)
|
||||
}
|
||||
|
||||
it, found = family[id]
|
||||
if found == false {
|
||||
log.Panic(ErrTagNotFound)
|
||||
}
|
||||
|
|
@ -143,6 +156,28 @@ func (ti *TagIndex) GetWithTagId(id uint16) (it *IndexedTag, err error) {
|
|||
return it, nil
|
||||
}
|
||||
|
||||
// GetIfdName returns the known index name for the tags that are expected/
|
||||
// allowed for the IFD. If there's an error, returns "". If returns "", the IFD
|
||||
// should be skipped.
|
||||
func IfdName(ifdName string, ifdIndex int) string {
|
||||
// There's an IFD0 and IFD1, but the others must be unique.
|
||||
if ifdName == IfdStandard && ifdIndex > 1 {
|
||||
tagsLogger.Errorf(nil, "The 'IFD' IFD can not occur more than twice: [%s]. Ignoring IFD.", ifdName)
|
||||
return ""
|
||||
} else if ifdName != IfdStandard && ifdIndex > 0 {
|
||||
tagsLogger.Errorf(nil, "Only the 'IFD' IFD can be repeated: [%s]. Ignoring IFD.", ifdName)
|
||||
return ""
|
||||
}
|
||||
|
||||
return ifdName
|
||||
}
|
||||
|
||||
// IsIfdTag returns true if the given tag points to a child IFD block.
|
||||
func IsIfdTag(tagId uint16) (name string, found bool) {
|
||||
name, found = IfdTags[tagId]
|
||||
return name, found
|
||||
}
|
||||
|
||||
func init() {
|
||||
goPath := os.Getenv("GOPATH")
|
||||
if goPath == "" {
|
||||
|
|
|
|||
|
|
@ -6,13 +6,15 @@ import (
|
|||
"github.com/dsoprea/go-logging"
|
||||
)
|
||||
|
||||
func TestGetWithTagId(t *testing.T) {
|
||||
func TestGet(t *testing.T) {
|
||||
ti := NewTagIndex()
|
||||
|
||||
it, err := ti.GetWithTagId(0x10f)
|
||||
indexedIfdName := IfdName(IfdStandard, 0)
|
||||
|
||||
it, err := ti.Get(indexedIfdName, 0x10f)
|
||||
log.PanicIf(err)
|
||||
|
||||
if it.Is(0x10f) == false || it.IsName("Image", "Make") == false {
|
||||
if it.Is(0x10f) == false || it.IsName("IFD", "Make") == false {
|
||||
t.Fatalf("tag info not correct")
|
||||
}
|
||||
}
|
||||
|
|
|
|||
6
type.go
6
type.go
|
|
@ -16,7 +16,7 @@ const (
|
|||
TypeShort = uint16(3)
|
||||
TypeLong = uint16(4)
|
||||
TypeRational = uint16(5)
|
||||
TypeUndefined = uint16(6)
|
||||
TypeUndefined = uint16(7)
|
||||
TypeSignedLong = uint16(9)
|
||||
TypeSignedRational = uint16(10)
|
||||
)
|
||||
|
|
@ -586,7 +586,7 @@ func (tt TagType) ValueString(valueContext ValueContext, justFirst bool) (value
|
|||
} else {
|
||||
return "", nil
|
||||
}
|
||||
} else if tt.Type() == TypeRational {
|
||||
} else if tt.Type() == TypeSignedRational {
|
||||
raw, err := tt.ReadSignedRationalValues(valueContext)
|
||||
log.PanicIf(err)
|
||||
|
||||
|
|
@ -603,7 +603,7 @@ func (tt TagType) ValueString(valueContext ValueContext, justFirst bool) (value
|
|||
return "", nil
|
||||
}
|
||||
} else {
|
||||
log.Panicf("value of type [%s] is unparseable", tt)
|
||||
log.Panicf("value of type (%d) [%s] is unparseable", tt.Type(), tt)
|
||||
|
||||
// Never called.
|
||||
return "", nil
|
||||
|
|
|
|||
Loading…
Reference in New Issue