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// Package mknote provides makernote parsers that can be used with goexif/exif.
package mknote
import (
"bytes"
"github.com/rwcarlsen/goexif/exif"
"github.com/rwcarlsen/goexif/tiff"
)
var (
// Canon is an exif.Parser for canon makernote data.
Canon = &canon{}
// NikonV3 is an exif.Parser for nikon makernote data.
NikonV3 = &nikonV3{}
// All is a list of all available makernote parsers
All = []exif.Parser{Canon, NikonV3}
)
type canon struct{}
// Parse decodes all Canon makernote data found in x and adds it to x.
func (_ *canon) Parse(x *exif.Exif) error {
m, err := x.Get(exif.MakerNote)
if err != nil {
return nil
}
mk, err := x.Get(exif.Make)
if err != nil {
return nil
}
if val, err := mk.StringVal(); err != nil || val != "Canon" {
return nil
}
// Canon notes are a single IFD directory with no header.
// Reader offsets need to be w.r.t. the original tiff structure.
buf := bytes.NewReader(append(make([]byte, m.ValOffset), m.Val...))
buf.Seek(int64(m.ValOffset), 0)
mkNotesDir, _, err := tiff.DecodeDir(buf, x.Tiff.Order)
if err != nil {
return err
}
x.LoadTags(mkNotesDir, makerNoteCanonFields, false)
return nil
}
type nikonV3 struct{}
// Parse decodes all Nikon makernote data found in x and adds it to x.
func (_ *nikonV3) Parse(x *exif.Exif) error {
m, err := x.Get(exif.MakerNote)
if err != nil {
return nil
} else if bytes.Compare(m.Val[:6], []byte("Nikon\000")) != 0 {
return nil
}
// Nikon v3 maker note is a self-contained IFD (offsets are relative
// to the start of the maker note)
mkNotes, err := tiff.Decode(bytes.NewReader(m.Val[10:]))
if err != nil {
return err
}
x.LoadTags(mkNotes.Dirs[0], makerNoteNikon3Fields, false)
return nil
}
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