package exif
import (
"testing"
"os"
"path"
"fmt"
"reflect"
"io/ioutil"
"github.com/dsoprea/go-logging"
)
var (
assetsPath = ""
)
func TestIsExif_True(t *testing.T) {
e := NewExif()
if ok := e.IsExif([]byte("Exif\000\000")); ok != true {
t.Fatalf("expected true")
}
}
func TestIsExif_False(t *testing.T) {
e := NewExif()
if ok := e.IsExif([]byte("something unexpected")); ok != false {
t.Fatalf("expected false")
}
}
func TestVisit(t *testing.T) {
defer func() {
if state := recover(); state != nil {
err := log.Wrap(state.(error))
log.PrintErrorf(err, "Exif failure.")
}
}()
// Open the file.
filepath := path.Join(assetsPath, "NDM_8901.jpg")
f, err := os.Open(filepath)
log.PanicIf(err)
defer f.Close()
data, err := ioutil.ReadAll(f)
log.PanicIf(err)
// Search for the beginning of the EXIF information. The EXIF is near the
// very beginning of our/most JPEGs, so this has a very low cost.
e := NewExif()
foundAt := -1
for i := 0; i < len(data); i++ {
if e.IsExif(data[i:i + 6]) == true {
foundAt = i
break
}
}
if foundAt == -1 {
log.Panicf("EXIF start not found")
}
// Run the parse.
ti := NewTagIndex()
tags := make([]string, 0)
visitor := func(indexedIfdName string, tagId uint16, tagType TagType, valueContext ValueContext) (err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
log.Panic(err)
}
}()
it, err := ti.Get(indexedIfdName, tagId)
if err != nil {
if log.Is(err, ErrTagNotFound) {
fmt.Printf("Unknown tag: [%s] (%04x)\n", indexedIfdName, tagId)
return nil
} else {
log.Panic(err)
}
}
valueString := ""
if tagType.Type() == TypeUndefined {
value, err := UndefinedValue(indexedIfdName, tagId, valueContext, tagType.ByteOrder())
if log.Is(err, ErrUnhandledUnknownTypedTag) {
valueString = "!UNDEFINED!"
} else if err != nil {
log.Panic(err)
} else {
valueString = value.(string)
}
} else {
valueString, err = tagType.ValueString(valueContext, true)
log.PanicIf(err)
}
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)
tags = append(tags, description)
return nil
}
err = e.Visit(data[foundAt:], visitor)
log.PanicIf(err)
// for _, line := range tags {
// fmt.Printf("TAGS: %s\n", line)
// }
expected := []string {
"IFD=[IFD] ID=(0x010f) NAME=[Make] COUNT=(6) TYPE=[ASCII] VALUE=[Canon]",
"IFD=[IFD] ID=(0x0110) NAME=[Model] COUNT=(22) TYPE=[ASCII] VALUE=[Canon EOS 5D Mark III]",
"IFD=[IFD] ID=(0x0112) NAME=[Orientation] COUNT=(1) TYPE=[SHORT] VALUE=[1]",
"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=(0x0132) NAME=[DateTime] COUNT=(20) TYPE=[ASCII] VALUE=[2017:12:02 08:18:50]",
"IFD=[IFD] ID=(0x013b) NAME=[Artist] COUNT=(1) TYPE=[ASCII] VALUE=[]",
"IFD=[IFD] ID=(0x0213) NAME=[YCbCrPositioning] COUNT=(1) TYPE=[SHORT] VALUE=[2]",
"IFD=[IFD] ID=(0x8298) NAME=[Copyright] COUNT=(1) TYPE=[ASCII] VALUE=[]",
"IFD=[IFD] ID=(0x8769) NAME=[ExifTag] COUNT=(1) TYPE=[LONG] VALUE=[360]",
"IFD=[Exif] ID=(0x829a) NAME=[ExposureTime] COUNT=(1) TYPE=[RATIONAL] VALUE=[1/640]",
"IFD=[Exif] ID=(0x829d) NAME=[FNumber] COUNT=(1) TYPE=[RATIONAL] VALUE=[4/1]",
"IFD=[Exif] ID=(0x8822) NAME=[ExposureProgram] COUNT=(1) TYPE=[SHORT] VALUE=[4]",
"IFD=[Exif] ID=(0x8827) NAME=[ISOSpeedRatings] COUNT=(1) TYPE=[SHORT] VALUE=[1600]",
"IFD=[Exif] ID=(0x8830) NAME=[SensitivityType] COUNT=(1) TYPE=[SHORT] VALUE=[2]",
"IFD=[Exif] ID=(0x8832) NAME=[RecommendedExposureIndex] COUNT=(1) TYPE=[LONG] VALUE=[1600]",
"IFD=[Exif] ID=(0x9000) NAME=[ExifVersion] COUNT=(4) TYPE=[UNDEFINED] VALUE=[0230]",
"IFD=[Exif] ID=(0x9003) NAME=[DateTimeOriginal] COUNT=(20) TYPE=[ASCII] VALUE=[2017:12:02 08:18:50]",
"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=[0100]",
"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 {
t.Fatalf("tags not correct:\n%v", tags)
}
}
func init() {
goPath := os.Getenv("GOPATH")
if goPath == "" {
log.Panicf("GOPATH is empty")
}
assetsPath = path.Join(goPath, "src", "github.com", "dsoprea", "go-exif", "assets")
}