2019-01-09 02:12:53 +00:00
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package dcc
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2019-01-22 02:43:21 +00:00
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import (
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"encoding/binary"
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2019-02-03 22:08:45 +00:00
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"fmt"
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2019-01-22 02:43:21 +00:00
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"io"
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2019-01-23 02:49:23 +00:00
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"github.com/FooSoft/lazarus/streaming"
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2019-01-22 02:43:21 +00:00
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)
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2019-01-09 02:12:53 +00:00
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2019-01-22 02:43:21 +00:00
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type Sprite struct {
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2019-01-09 02:12:53 +00:00
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}
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2019-01-17 03:04:49 +00:00
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type extents struct {
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x1 int32
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y1 int32
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x2 int32
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y2 int32
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}
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type fileHeader struct {
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Signature uint8
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Version uint8
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DirCount uint8
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FramesPerDir uint32
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Tag uint32
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FinalDc6Size uint32
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}
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type directionHeader struct {
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CodedSize uint32
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HasRawPixelEncoding bool
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CompressEqualCells bool
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Variable0Bits uint8
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WidthBits uint8
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HeightBits uint8
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OffsetXBits uint8
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OffsetYBits uint8
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OptionalBytesBits uint8
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CodedBytesBits uint8
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}
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type frameHeader struct {
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Variable0 uint32
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Width uint32
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Height uint32
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OffsetX int32
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OffsetY int32
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OptionalBytes uint32
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CodedBytes uint32
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FrameBottomUp bool
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Extents extents
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}
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2019-01-22 02:43:21 +00:00
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func NewFromReader(reader io.ReadSeeker) (*Sprite, error) {
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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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2019-02-03 22:08:45 +00:00
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for i := 0; i < int(fileHead.DirCount); i++ {
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2019-01-23 02:49:23 +00:00
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var offsetDir uint32
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if err := binary.Read(reader, binary.LittleEndian, &offsetDir); err != nil {
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return nil, err
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}
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offset, err := reader.Seek(0, io.SeekCurrent)
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if err != nil {
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return nil, err
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}
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if _, err := reader.Seek(int64(offsetDir), io.SeekStart); err != nil {
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return nil, err
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}
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2019-02-03 22:08:45 +00:00
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if err := readDirection(reader, fileHead); err != nil {
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2019-01-23 02:49:23 +00:00
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return nil, err
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}
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if _, err := reader.Seek(offset, io.SeekStart); err != nil {
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2019-01-22 03:34:53 +00:00
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return nil, err
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}
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}
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2019-01-09 02:12:53 +00:00
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return nil, nil
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}
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2019-01-23 02:49:23 +00:00
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2019-02-10 16:55:14 +00:00
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func readDirectionHeader(bitReader *streaming.BitReader) *directionHeader {
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var dirHead directionHeader
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2019-02-10 18:36:01 +00:00
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dirHead.CodedSize = uint32(bitReader.ReadUint(32))
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dirHead.HasRawPixelEncoding = bitReader.ReadBool()
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dirHead.CompressEqualCells = bitReader.ReadBool()
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dirHead.Variable0Bits = uint8(bitReader.ReadUint(4))
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dirHead.WidthBits = uint8(bitReader.ReadUint(4))
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dirHead.HeightBits = uint8(bitReader.ReadUint(4))
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dirHead.OffsetXBits = uint8(bitReader.ReadInt(4))
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dirHead.OffsetYBits = uint8(bitReader.ReadInt(4))
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dirHead.OptionalBytesBits = uint8(bitReader.ReadUint(4))
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dirHead.CodedBytesBits = uint8(bitReader.ReadUint(4))
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return &dirHead
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2019-01-23 02:49:23 +00:00
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}
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2019-02-10 16:55:14 +00:00
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func readFrameHeader(bitReader *streaming.BitReader, dirHead directionHeader) *frameHeader {
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var frameHead frameHeader
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2019-02-10 18:36:01 +00:00
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frameHead.Variable0 = uint32(bitReader.ReadUintPacked(int(dirHead.Variable0Bits)))
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frameHead.Width = uint32(bitReader.ReadUintPacked(int(dirHead.WidthBits)))
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frameHead.Height = uint32(bitReader.ReadUintPacked(int(dirHead.HeightBits)))
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frameHead.OffsetX = int32(bitReader.ReadIntPacked(int(dirHead.OffsetXBits)))
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frameHead.OffsetY = int32(bitReader.ReadIntPacked(int(dirHead.OffsetYBits)))
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frameHead.OptionalBytes = uint32(bitReader.ReadUintPacked(int(dirHead.OptionalBytesBits)))
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frameHead.CodedBytes = uint32(bitReader.ReadUintPacked(int(dirHead.CodedBytesBits)))
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frameHead.FrameBottomUp = bitReader.ReadBool()
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2019-02-10 16:55:14 +00:00
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return &frameHead
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}
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func readDirection(reader io.ReadSeeker, fileHead fileHeader) error {
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2019-02-10 04:06:09 +00:00
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bitReader := streaming.NewBitReader(reader)
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2019-02-10 16:55:14 +00:00
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dirHead := readDirectionHeader(bitReader)
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2019-02-10 16:56:45 +00:00
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if err := bitReader.Error(); err != nil {
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return err
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}
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2019-02-10 16:55:14 +00:00
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frameHead := readFrameHeader(bitReader, *dirHead)
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2019-02-10 16:56:45 +00:00
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if err := bitReader.Error(); err != nil {
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return err
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}
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2019-02-03 22:08:45 +00:00
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2019-02-10 04:06:09 +00:00
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fmt.Printf("%+v\n", dirHead)
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fmt.Printf("%+v\n", frameHead)
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2019-01-23 02:49:23 +00:00
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return nil
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}
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