mirror of https://github.com/dsoprea/go-exif.git
60 lines
1.6 KiB
Go
60 lines
1.6 KiB
Go
package exifundefined
|
|
|
|
import (
|
|
"encoding/binary"
|
|
|
|
"github.com/dsoprea/go-logging"
|
|
|
|
"github.com/dsoprea/go-exif/v2/common"
|
|
)
|
|
|
|
func Encode(value EncodeableValue, byteOrder binary.ByteOrder) (encoded []byte, unitCount uint32, err error) {
|
|
defer func() {
|
|
if state := recover(); state != nil {
|
|
err = log.Wrap(state.(error))
|
|
}
|
|
}()
|
|
|
|
encoderName := value.EncoderName()
|
|
|
|
encoder, found := encoders[encoderName]
|
|
if found == false {
|
|
log.Panicf("no encoder registered for type [%s]", encoderName)
|
|
}
|
|
|
|
encoded, unitCount, err = encoder.Encode(value, byteOrder)
|
|
log.PanicIf(err)
|
|
|
|
return encoded, unitCount, nil
|
|
}
|
|
|
|
// UndefinedValue knows how to resolve the value for most unknown-type tags.
|
|
func Decode(ifdPath string, tagId uint16, valueContext *exifcommon.ValueContext, byteOrder binary.ByteOrder) (value EncodeableValue, err error) {
|
|
defer func() {
|
|
if state := recover(); state != nil {
|
|
err = log.Wrap(state.(error))
|
|
}
|
|
}()
|
|
|
|
uth := UndefinedTagHandle{
|
|
IfdPath: ifdPath,
|
|
TagId: tagId,
|
|
}
|
|
|
|
decoder, found := decoders[uth]
|
|
if found == false {
|
|
// We have no choice but to return the error. We have no way of knowing how
|
|
// much data there is without already knowing what data-type this tag is.
|
|
return nil, exifcommon.ErrUnhandledUnknownTypedTag
|
|
}
|
|
|
|
if valueContext.IfdPath() != ifdPath || valueContext.TagId() != tagId {
|
|
log.Panicf("IFD-path for codec does not match value-context: [%s] (0x%04x) != [%s] (0x%04x)", ifdPath, tagId, valueContext.IfdPath(), valueContext.TagId())
|
|
}
|
|
|
|
value, err = decoder.Decode(valueContext)
|
|
log.PanicIf(err)
|
|
|
|
return value, nil
|
|
}
|