63 lines
1.4 KiB
Go
63 lines
1.4 KiB
Go
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package exifundefined
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import (
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"encoding/binary"
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log "github.com/dsoprea/go-logging"
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exifcommon "github.com/dsoprea/go-exif/v2/common"
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)
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// Encode encodes the given encodeable undefined value to bytes.
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func Encode(value EncodeableValue, byteOrder binary.ByteOrder) (encoded []byte, unitCount uint32, 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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}
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}()
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encoderName := value.EncoderName()
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encoder, found := encoders[encoderName]
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if found == false {
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log.Panicf("no encoder registered for type [%s]", encoderName)
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}
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encoded, unitCount, err = encoder.Encode(value, byteOrder)
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log.PanicIf(err)
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return encoded, unitCount, nil
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}
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// Decode constructs a value from raw encoded bytes
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func Decode(valueContext *exifcommon.ValueContext) (value EncodeableValue, 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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}
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}()
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uth := UndefinedTagHandle{
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IfdPath: valueContext.IfdPath(),
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TagId: valueContext.TagId(),
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}
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decoder, found := decoders[uth]
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if found == false {
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// We have no choice but to return the error. We have no way of knowing how
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// much data there is without already knowing what data-type this tag is.
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return nil, exifcommon.ErrUnhandledUndefinedTypedTag
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}
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value, err = decoder.Decode(valueContext)
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if err != nil {
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if err == ErrUnparseableValue {
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return nil, err
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}
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log.Panic(err)
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}
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return value, nil
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}
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