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|
package move
import (
"slices"
"github.com/osm/quake/common/buffer"
"github.com/osm/quake/common/context"
"github.com/osm/quake/common/crc"
"github.com/osm/quake/packet/command/deltausercommand"
"github.com/osm/quake/protocol"
)
type Command struct {
Checksum byte
Lossage byte
Null *deltausercommand.Command
Old *deltausercommand.Command
New *deltausercommand.Command
}
func (cmd *Command) Bytes() []byte {
buf := buffer.New()
buf.PutByte(protocol.CLCMove)
buf.PutByte(cmd.Checksum)
buf.PutByte(cmd.Lossage)
if cmd.Null != nil {
buf.PutBytes(cmd.Null.Bytes())
}
if cmd.Old != nil {
buf.PutBytes(cmd.Old.Bytes())
}
if cmd.New != nil {
buf.PutBytes(cmd.New.Bytes())
}
return buf.Bytes()
}
func (cmd *Command) GetChecksum(sequence uint32) byte {
b := slices.Concat(
[]byte{cmd.Lossage},
cmd.Null.Bytes(),
cmd.Old.Bytes(),
cmd.New.Bytes(),
)
return crc.Byte(b, int(sequence))
}
func Parse(ctx *context.Context, buf *buffer.Buffer) (*Command, error) {
var err error
var cmd Command
if cmd.Checksum, err = buf.ReadByte(); err != nil {
return nil, err
}
if cmd.Lossage, err = buf.ReadByte(); err != nil {
return nil, err
}
if cmd.Null, err = deltausercommand.Parse(ctx, buf); err != nil {
return nil, err
}
if cmd.Old, err = deltausercommand.Parse(ctx, buf); err != nil {
return nil, err
}
if cmd.New, err = deltausercommand.Parse(ctx, buf); err != nil {
return nil, err
}
return &cmd, nil
}
|
