45 lines
866 B
Go
45 lines
866 B
Go
// Copyright (C) 2014 The Protocol Authors.
|
|
|
|
package protocol
|
|
|
|
import "github.com/calmh/xdr"
|
|
|
|
type header struct {
|
|
version int
|
|
msgID int
|
|
msgType int
|
|
compression bool
|
|
}
|
|
|
|
func (h header) MarshalXDRInto(m *xdr.Marshaller) error {
|
|
v := encodeHeader(h)
|
|
m.MarshalUint32(v)
|
|
return m.Error
|
|
}
|
|
|
|
func (h *header) UnmarshalXDRFrom(u *xdr.Unmarshaller) error {
|
|
v := u.UnmarshalUint32()
|
|
*h = decodeHeader(v)
|
|
return u.Error
|
|
}
|
|
|
|
func encodeHeader(h header) uint32 {
|
|
var isComp uint32
|
|
if h.compression {
|
|
isComp = 1 << 0 // the zeroth bit is the compression bit
|
|
}
|
|
return uint32(h.version&0xf)<<28 +
|
|
uint32(h.msgID&0xfff)<<16 +
|
|
uint32(h.msgType&0xff)<<8 +
|
|
isComp
|
|
}
|
|
|
|
func decodeHeader(u uint32) header {
|
|
return header{
|
|
version: int(u>>28) & 0xf,
|
|
msgID: int(u>>16) & 0xfff,
|
|
msgType: int(u>>8) & 0xff,
|
|
compression: u&1 == 1,
|
|
}
|
|
}
|