mirror of
https://github.com/dsoprea/go-exif.git
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08ac8466dd
This allows us to pass around individual tokens that we can use to generate IDs, names, and qualified and non-qualified IFD paths, rather than [necessarily] having to pass or store them individually. The previous global variables were strings. Now they are IfdIdentity structs and have been renamed to be more accurate (in general, as well as for this). The previous variables have been kept but are now just assigned to the newer variables. This is backwards-compatibility that will be removed in the future.
98 lines
2.1 KiB
Go
98 lines
2.1 KiB
Go
package exifundefined
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import (
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"bytes"
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"fmt"
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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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func (TagA302CfaPattern) EncoderName() string {
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return "CodecA302CfaPattern"
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}
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func (cp TagA302CfaPattern) String() string {
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return fmt.Sprintf("TagA302CfaPattern<HORZ-REPEAT=(%d) VERT-REPEAT=(%d) CFA-VALUE=(%d)>", cp.HorizontalRepeat, cp.VerticalRepeat, len(cp.CfaValue))
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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 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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// TODO(dustin): Add test using known good data.
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valueContext.SetUndefinedValueType(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.IfdExifStandardIfdIdentity.UnindexedString(),
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0xa302,
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CodecA302CfaPattern{})
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}
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