add dcc structures

formats/dcc/dcc.go

@@ -5,6 +5,47 @@ import "io"
 type DccSprite struct {
 }
 
+type extents struct {
+	x1 int32
+	y1 int32
+	x2 int32
+	y2 int32
+}
+
+type fileHeader struct {
+	Signature    uint8
+	Version      uint8
+	DirCount     uint8
+	FramesPerDir uint32
+	Tag          uint32
+	FinalDc6Size uint32
+}
+
+type directionHeader struct {
+	CodedSize           uint32
+	HasRawPixelEncoding bool
+	CompressEqualCells  bool
+	Variable0Bits       uint32
+	WidthBits           uint32
+	HeightBits          uint32
+	OffsetXBits         int32
+	OffsetYBits         int32
+	OptionalBytesBits   uint32
+	CodedBytesBits      uint32
+}
+
+type frameHeader struct {
+	Variable0     uint32
+	Width         uint32
+	Height        uint32
+	OffsetX       int32
+	OffsetY       int32
+	OptionalBytes uint32
+	CodedBytes    uint32
+	FrameBottomUp bool
+	Extents       extents
+}
+
 func NewFromReader(reader io.ReadSeeker) (*DccSprite, error) {
 	return nil, nil
 }