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