69 lines
1.8 KiB
Go
69 lines
1.8 KiB
Go
package dcc
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import (
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"errors"
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"github.com/FooSoft/lazarus/streaming"
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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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}
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type frame struct {
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header frameHeader
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bounds bounds
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}
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func readFrameHeader(bitReader *streaming.BitReader, dirHead directionHeader) (*frameHeader, error) {
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var frameHead frameHeader
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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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if err := bitReader.Error(); err != nil {
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return nil, err
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}
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if frameHead.OptionalBytes != 0 {
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return nil, errors.New("optional frame data not supported")
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}
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if frameHead.FrameBottomUp {
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return nil, errors.New("bottom-up frames are not supported")
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}
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if frameHead.Width == 0 || frameHead.Height == 0 {
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return nil, errors.New("invalid frame dimensions")
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}
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return &frameHead, nil
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}
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func readFrameHeaders(bitReader *streaming.BitReader, fileHead fileHeader, dirHead directionHeader) ([]frameHeader, error) {
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var frameHeads []frameHeader
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for i := 0; i < int(fileHead.FramesPerDir); i++ {
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frameHead, err := readFrameHeader(bitReader, dirHead)
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if err != nil {
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return nil, err
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}
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frameHeads = append(frameHeads, *frameHead)
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}
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return frameHeads, nil
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}
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