func (x *Exif) loadSubDir(r *bytes.Reader, tagId uint16) error {
tag, ok := x.main[tagId]
if !ok {
return nil
}
offset := tag.Int(0)
_, err := r.Seek(offset, 0)
if err != nil {
return errors.New("exif: seek to sub-IFD failed: " + err.Error())
}
subDir, _, err := tiff.DecodeDir(r, x.tif.Order)
if err != nil {
return errors.New("exif: sub-IFD decode failed: " + err.Error())
}
for _, tag := range subDir.Tags {
x.main[tag.Id] = tag
}
return nil
}
func (x *Exif) loadSubDir(r *bytes.Reader, ptrName FieldName, fieldMap map[uint16]FieldName) error {
tag, ok := x.main[ptrName]
if !ok {
return nil
}
offset := tag.Int(0)
_, err := r.Seek(offset, 0)
if err != nil {
return errors.New("exif: seek to sub-IFD failed: " + err.Error())
}
subDir, _, err := tiff.DecodeDir(r, x.tif.Order)
if err != nil {
return errors.New("exif: sub-IFD decode failed: " + err.Error())
}
for _, tag := range subDir.Tags {
name := fieldMap[tag.Id]
x.main[name] = tag
}
return nil
}