mirror of https://github.com/dsoprea/go-exif.git
89 lines
1.8 KiB
Go
89 lines
1.8 KiB
Go
package exifundefined
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import (
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"bytes"
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"encoding/binary"
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"github.com/dsoprea/go-logging"
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"github.com/dsoprea/go-exif/v2/common"
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)
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type TagA302CfaPattern struct {
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HorizontalRepeat uint16
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VerticalRepeat uint16
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CfaValue []byte
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}
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type CodecA302CfaPattern struct {
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}
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func (CodecA302CfaPattern) Encode(value interface{}, 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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// TODO(dustin): Add test.
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cp, ok := value.(TagA302CfaPattern)
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if ok == false {
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log.Panicf("can only encode a TagA302CfaPattern")
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}
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b := new(bytes.Buffer)
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err = binary.Write(b, byteOrder, cp.HorizontalRepeat)
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log.PanicIf(err)
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err = binary.Write(b, byteOrder, cp.VerticalRepeat)
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log.PanicIf(err)
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_, err = b.Write(cp.CfaValue)
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log.PanicIf(err)
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encoded = b.Bytes()
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// TODO(dustin): Confirm this size against the specification.
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return encoded, uint32(len(encoded)), nil
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}
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func (CodecA302CfaPattern) Decode(valueContext *exifcommon.ValueContext) (value interface{}, 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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// TODO(dustin): Add test using known good data.
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valueContext.SetUnknownValueType(exifcommon.TypeByte)
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valueBytes, err := valueContext.ReadBytes()
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log.PanicIf(err)
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cp := TagA302CfaPattern{}
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cp.HorizontalRepeat = valueContext.ByteOrder().Uint16(valueBytes[0:2])
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cp.VerticalRepeat = valueContext.ByteOrder().Uint16(valueBytes[2:4])
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expectedLength := int(cp.HorizontalRepeat * cp.VerticalRepeat)
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cp.CfaValue = valueBytes[4 : 4+expectedLength]
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return cp, nil
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}
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func init() {
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registerEncoder(
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TagA302CfaPattern{},
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CodecA302CfaPattern{})
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registerDecoder(
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exifcommon.IfdPathStandardExif,
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0xa302,
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CodecA302CfaPattern{})
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}
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