mirror of https://github.com/dsoprea/go-exif.git
188 lines
8.4 KiB
Go
188 lines
8.4 KiB
Go
package exif
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import (
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"testing"
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"os"
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"path"
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"fmt"
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"reflect"
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"io/ioutil"
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"github.com/dsoprea/go-logging"
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)
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var (
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assetsPath = ""
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)
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func TestIsExif_True(t *testing.T) {
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e := NewExif()
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if ok := e.IsExif([]byte("Exif\000\000")); ok != true {
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t.Fatalf("expected true")
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}
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}
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func TestIsExif_False(t *testing.T) {
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e := NewExif()
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if ok := e.IsExif([]byte("something unexpected")); ok != false {
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t.Fatalf("expected false")
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}
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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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f, err := os.Open(filepath)
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log.PanicIf(err)
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defer f.Close()
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data, err := ioutil.ReadAll(f)
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log.PanicIf(err)
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// Search for the beginning of the EXIF information. The EXIF is near the
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// very beginning of our/most JPEGs, so this has a very low cost.
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e := NewExif()
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foundAt := -1
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for i := 0; i < len(data); i++ {
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if e.IsExif(data[i:i + 6]) == true {
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foundAt = i
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break
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}
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}
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if foundAt == -1 {
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log.Panicf("EXIF start not found")
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}
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// Run the parse.
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ti := NewTagIndex()
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tags := make([]string, 0)
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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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log.PrintErrorf(err, "The visitor encountered an error.")
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}
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}()
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it, err := ti.Get(indexedIfdName, tagId)
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if err != nil {
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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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// 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("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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}
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err = e.Parse(data[foundAt:], visitor)
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log.PanicIf(err)
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expected := []string {
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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]",
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"IFD=[Exif] ID=(0x9101) NAME=[ComponentsConfiguration] COUNT=(4) TYPE=[UNDEFINED] VALUE=[!UNDEFINED!]",
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"IFD=[Exif] ID=(0x9201) NAME=[ShutterSpeedValue] COUNT=(1) TYPE=[SRATIONAL] VALUE=[614400/65536]",
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"IFD=[Exif] ID=(0x9202) NAME=[ApertureValue] COUNT=(1) TYPE=[RATIONAL] VALUE=[262144/65536]",
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"IFD=[Exif] ID=(0x9204) NAME=[ExposureBiasValue] COUNT=(1) TYPE=[SRATIONAL] VALUE=[0/1]",
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"IFD=[Exif] ID=(0x9207) NAME=[MeteringMode] COUNT=(1) TYPE=[SHORT] VALUE=[5]",
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"IFD=[Exif] ID=(0x9209) NAME=[Flash] COUNT=(1) TYPE=[SHORT] VALUE=[16]",
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"IFD=[Exif] ID=(0x920a) NAME=[FocalLength] COUNT=(1) TYPE=[RATIONAL] VALUE=[16/1]",
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"IFD=[Exif] ID=(0x927c) NAME=[MakerNote] COUNT=(8152) TYPE=[UNDEFINED] VALUE=[!UNDEFINED!]",
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"IFD=[Exif] ID=(0x9286) NAME=[UserComment] COUNT=(264) TYPE=[UNDEFINED] VALUE=[!UNDEFINED!]",
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"IFD=[Exif] ID=(0x9290) NAME=[SubSecTime] COUNT=(3) TYPE=[ASCII] VALUE=[00]",
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"IFD=[Exif] ID=(0x9291) NAME=[SubSecTimeOriginal] COUNT=(3) TYPE=[ASCII] VALUE=[00]",
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"IFD=[Exif] ID=(0x9292) NAME=[SubSecTimeDigitized] COUNT=(3) TYPE=[ASCII] VALUE=[00]",
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"IFD=[Exif] ID=(0xa000) NAME=[FlashpixVersion] COUNT=(4) TYPE=[UNDEFINED] VALUE=[!UNDEFINED!]",
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"IFD=[Exif] ID=(0xa001) NAME=[ColorSpace] COUNT=(1) TYPE=[SHORT] VALUE=[1]",
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"IFD=[Exif] ID=(0xa002) NAME=[PixelXDimension] COUNT=(1) TYPE=[SHORT] VALUE=[3840]",
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"IFD=[Exif] ID=(0xa003) NAME=[PixelYDimension] COUNT=(1) TYPE=[SHORT] VALUE=[2560]",
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"IFD=[Exif] ID=(0xa005) NAME=[InteroperabilityTag] COUNT=(1) TYPE=[LONG] VALUE=[9326]",
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"IFD=[Iop] ID=(0x0001) NAME=[InteroperabilityIndex] COUNT=(4) TYPE=[ASCII] VALUE=[R98]",
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"IFD=[Iop] ID=(0x0002) NAME=[InteroperabilityVersion] COUNT=(4) TYPE=[UNDEFINED] VALUE=[!UNDEFINED!]",
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"IFD=[Exif] ID=(0xa20e) NAME=[FocalPlaneXResolution] COUNT=(1) TYPE=[RATIONAL] VALUE=[3840000/1461]",
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"IFD=[Exif] ID=(0xa20f) NAME=[FocalPlaneYResolution] COUNT=(1) TYPE=[RATIONAL] VALUE=[2560000/972]",
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"IFD=[Exif] ID=(0xa210) NAME=[FocalPlaneResolutionUnit] COUNT=(1) TYPE=[SHORT] VALUE=[2]",
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"IFD=[Exif] ID=(0xa401) NAME=[CustomRendered] COUNT=(1) TYPE=[SHORT] VALUE=[0]",
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"IFD=[Exif] ID=(0xa402) NAME=[ExposureMode] COUNT=(1) TYPE=[SHORT] VALUE=[0]",
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"IFD=[Exif] ID=(0xa403) NAME=[WhiteBalance] COUNT=(1) TYPE=[SHORT] VALUE=[0]",
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"IFD=[Exif] ID=(0xa406) NAME=[SceneCaptureType] COUNT=(1) TYPE=[SHORT] VALUE=[0]",
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"IFD=[Exif] ID=(0xa430) NAME=[CameraOwnerName] COUNT=(1) TYPE=[ASCII] VALUE=[]",
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"IFD=[Exif] ID=(0xa431) NAME=[BodySerialNumber] COUNT=(13) TYPE=[ASCII] VALUE=[063024020097]",
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"IFD=[Exif] ID=(0xa432) NAME=[LensSpecification] COUNT=(4) TYPE=[RATIONAL] VALUE=[16/1]",
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"IFD=[Exif] ID=(0xa434) NAME=[LensModel] COUNT=(22) TYPE=[ASCII] VALUE=[EF16-35mm f/4L IS USM]",
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"IFD=[Exif] ID=(0xa435) NAME=[LensSerialNumber] COUNT=(11) TYPE=[ASCII] VALUE=[2400001068]",
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"IFD=[IFD] ID=(0x8825) NAME=[GPSTag] COUNT=(1) TYPE=[LONG] VALUE=[9554]",
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"IFD=[GPSInfo] ID=(0x0000) NAME=[GPSVersionID] COUNT=(4) TYPE=[BYTE] VALUE=[2]",
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"IFD=[IFD] ID=(0x0103) NAME=[Compression] COUNT=(1) TYPE=[SHORT] VALUE=[6]",
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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=(0x0201) NAME=[JPEGInterchangeFormat] COUNT=(1) TYPE=[LONG] VALUE=[11444]",
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"IFD=[IFD] ID=(0x0202) NAME=[JPEGInterchangeFormatLength] COUNT=(1) TYPE=[LONG] VALUE=[21491]",
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}
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if reflect.DeepEqual(tags, expected) == false {
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t.Fatalf("tags not correct:\n%v", tags)
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}
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}
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func init() {
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goPath := os.Getenv("GOPATH")
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if goPath == "" {
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log.Panicf("GOPATH is empty")
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}
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assetsPath = path.Join(goPath, "src", "github.com", "dsoprea", "go-exif", "assets")
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}
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