65 lines
1.8 KiB
Go
65 lines
1.8 KiB
Go
|
package dcc
|
||
|
|
|
||
|
|
import (
|
||
|
|
"errors"
|
||
|
|
|
||
|
|
"github.com/FooSoft/lazarus/streaming"
|
||
|
|
)
|
||
|
|
|
||
|
|
type frameHeader struct {
|
||
|
|
Variable0 uint32
|
||
|
|
Width uint32
|
||
|
|
Height uint32
|
||
|
|
OffsetX int32
|
||
|
|
OffsetY int32
|
||
|
|
OptionalBytes uint32
|
||
|
|
CodedBytes uint32
|
||
|
|
FrameBottomUp bool
|
||
|
|
}
|
||
|
|
|
||
|
|
type frame struct {
|
||
|
|
header frameHeader
|
||
|
|
bounds bounds
|
||
|
|
}
|
||
|
|
|
||
|
|
func readFrameHeader(bitReader *streaming.BitReader, dirHead directionHeader) frameHeader {
|
||
|
|
var frameHead frameHeader
|
||
|
|
|
||
|
|
frameHead.Variable0 = uint32(bitReader.ReadUintPacked(int(dirHead.Variable0Bits)))
|
||
|
|
frameHead.Width = uint32(bitReader.ReadUintPacked(int(dirHead.WidthBits)))
|
||
|
|
frameHead.Height = uint32(bitReader.ReadUintPacked(int(dirHead.HeightBits)))
|
||
|
|
frameHead.OffsetX = int32(bitReader.ReadIntPacked(int(dirHead.OffsetXBits)))
|
||
|
|
frameHead.OffsetY = int32(bitReader.ReadIntPacked(int(dirHead.OffsetYBits)))
|
||
|
|
frameHead.OptionalBytes = uint32(bitReader.ReadUintPacked(int(dirHead.OptionalBytesBits)))
|
||
|
|
frameHead.CodedBytes = uint32(bitReader.ReadUintPacked(int(dirHead.CodedBytesBits)))
|
||
|
|
frameHead.FrameBottomUp = bitReader.ReadBool()
|
||
|
|
|
||
|
|
return frameHead
|
||
|
|
}
|
||
|
|
|
||
|
|
func readFrameHeaders(bitReader *streaming.BitReader, fileHead fileHeader, dirHead directionHeader) ([]frameHeader, error) {
|
||
|
|
var frameHeads []frameHeader
|
||
|
|
for i := 0; i < int(fileHead.FramesPerDir); i++ {
|
||
|
|
frameHead := readFrameHeader(bitReader, dirHead)
|
||
|
|
if err := bitReader.Error(); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
if frameHead.OptionalBytes != 0 {
|
||
|
|
return nil, errors.New("optional frame data not supported")
|
||
|
|
}
|
||
|
|
|
||
|
|
if frameHead.FrameBottomUp {
|
||
|
|
return nil, errors.New("bottom-up frames are not supported")
|
||
|
|
}
|
||
|
|
|
||
|
|
if frameHead.Width == 0 || frameHead.Height == 0 {
|
||
|
|
return nil, errors.New("invalid frame dimensions")
|
||
|
|
}
|
||
|
|
|
||
|
|
frameHeads = append(frameHeads, frameHead)
|
||
|
|
}
|
||
|
|
|
||
|
|
return frameHeads, nil
|
||
|
|
}
|