132 lines
2.6 KiB
Go
132 lines
2.6 KiB
Go
package dc6
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import (
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"encoding/binary"
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"io"
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"github.com/FooSoft/lazarus/streaming"
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)
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type fileHeader struct {
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Version uint32
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UnusedFlags uint32
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UnusedFormat uint32
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UnusedSkipColor uint32
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DirCount uint32
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FramesPerDir uint32
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}
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type frameHeader struct {
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Flip uint32
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Width uint32
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Height uint32
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OffsetX uint32
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OffsetY uint32
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UnusedAllocSize uint32
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UnusedNextBlock uint32
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Length uint32
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}
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type Direction struct {
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Frames []Frame
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}
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type Frame struct {
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Width int
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Height int
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OffsetX int
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OffsetY int
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Data []byte
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}
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type Sprite struct {
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Directions []Direction
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}
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func New(reader io.ReadSeeker) (*Sprite, error) {
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sprite := new(Sprite)
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var fileHead fileHeader
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if err := binary.Read(reader, binary.LittleEndian, &fileHead); err != nil {
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return nil, err
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}
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frameCount := int(fileHead.DirCount * fileHead.FramesPerDir)
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var frameOffsets []uint32
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for i := 0; i < frameCount; i++ {
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var frameOffset uint32
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if err := binary.Read(reader, binary.LittleEndian, &frameOffset); err != nil {
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return nil, err
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}
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frameOffsets = append(frameOffsets, frameOffset)
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}
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sprite.Directions = make([]Direction, fileHead.FramesPerDir)
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for i := 0; i < frameCount; i++ {
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var frameHead frameHeader
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if _, err := reader.Seek(int64(frameOffsets[i]), io.SeekStart); err != nil {
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return nil, err
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}
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if err := binary.Read(reader, binary.LittleEndian, &frameHead); err != nil {
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return nil, err
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}
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data := make([]byte, frameHead.Width*frameHead.Height)
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writer := streaming.NewWriter(data)
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if err := extractFrame(reader, writer, frameHead); err != nil {
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return nil, err
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}
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frame := Frame{
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int(frameHead.Width),
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int(frameHead.Height),
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int(frameHead.OffsetX),
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int(frameHead.OffsetY),
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data,
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}
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direction := &sprite.Directions[i/int(fileHead.FramesPerDir)]
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direction.Frames = append(direction.Frames, frame)
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}
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return sprite, nil
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}
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func extractFrame(reader io.ReadSeeker, writer io.WriteSeeker, header frameHeader) error {
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var (
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x uint32
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y = header.Height - 1
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)
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var offset uint32
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for offset < header.Length {
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var chunkSize byte
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if err := binary.Read(reader, binary.LittleEndian, &chunkSize); err != nil {
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return err
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}
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if chunkSize == 0x80 {
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x = 0
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y--
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} else if (chunkSize & 0x80) != 0 {
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x += uint32(chunkSize & 0x7f)
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} else {
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if _, err := writer.Seek(int64(header.Width*y+x), io.SeekStart); err != nil {
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return err
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}
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if _, err := io.CopyN(writer, reader, int64(chunkSize)); err != nil {
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return err
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}
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offset += uint32(chunkSize)
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x += uint32(chunkSize)
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}
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}
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return nil
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}
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