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42 lines
880 B
Go
42 lines
880 B
Go
package message
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import "encoding/binary"
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// piece: <len=0009+X><id=7><index><begin><block>
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type Piece struct {
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*Message
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Index uint32
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Begin uint32
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Block []byte
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}
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func NewPiece(index uint32, begin uint32, block []byte) *Piece {
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return &Piece{
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Message: &Message{
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Length: 9 + uint32(len(block)),
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ID: IdPiece,
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},
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Index: index,
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Begin: begin,
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// Block: io.LimitReader(reader, int64(length)),
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Block: block,
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}
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}
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func (p *Piece) Encode() []byte {
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buf := make([]byte, 8)
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binary.BigEndian.PutUint32(buf[:4], p.Index)
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binary.BigEndian.PutUint32(buf[4:8], p.Begin)
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buf = append(buf, p.Block...)
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return append(p.Message.Encode(), buf...)
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}
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func (p *Piece) Decode(buf []byte) Serialize {
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p.Message = &Message{}
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p.Message.Decode(buf)
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p.Index = binary.BigEndian.Uint32(buf[5:9])
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p.Begin = binary.BigEndian.Uint32(buf[9:13])
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p.Block = buf[13:]
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return p
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}
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