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git-subtree-dir: lib/protocol git-subtree-mainline:5ecb8bdd8agit-subtree-split:f91191218b
44 lines
842 B
Go
44 lines
842 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) encodeXDR(xw *xdr.Writer) (int, error) {
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u := encodeHeader(h)
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return xw.WriteUint32(u)
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}
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func (h *header) decodeXDR(xr *xdr.Reader) error {
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u := xr.ReadUint32()
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*h = decodeHeader(u)
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return xr.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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