forked from knusbaum/go9p
/
walk.go
106 lines (93 loc) · 2.3 KB
/
walk.go
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package proto
import "fmt"
type TWalk struct {
Header
Fid uint32
Newfid uint32
Nwname uint16
Wname []string
}
func (walk *TWalk) String() string {
ret := fmt.Sprintf("twalk: [%s, fid: %d, newfid: %d, nwname: %d, wname: <",
&walk.Header, walk.Fid, walk.Newfid, walk.Nwname)
for _, s := range walk.Wname {
ret += s + ", "
}
ret += ">]"
return ret
}
func (walk *TWalk) parse(buff []byte) ([]byte, error) {
walk.Fid, buff = fromLittleE32(buff)
walk.Newfid, buff = fromLittleE32(buff)
walk.Nwname, buff = fromLittleE16(buff)
walk.Wname = make([]string, walk.Nwname)
var i uint16
for ; i < walk.Nwname; i++ {
walk.Wname[i], buff = fromString(buff)
}
return buff, nil
}
func (walk *TWalk) Compose() []byte {
// size[4] Twalk tag[2] fid[4] newfid[4] nwname[2] nwname*(wname[s])
length := 4 + 1 + 2 + 4 + 4 + 2
for _, name := range walk.Wname {
length += 2 + len(name)
}
buff := make([]byte, length)
buffer := buff
buffer = toLittleE32(uint32(length), buffer)
buffer[0] = walk.Type
buffer = buffer[1:]
buffer = toLittleE16(walk.Tag, buffer)
buffer = toLittleE32(walk.Fid, buffer)
buffer = toLittleE32(walk.Newfid, buffer)
buffer = toLittleE16(walk.Nwname, buffer)
for _, name := range walk.Wname {
buffer = toString(name, buffer)
}
return buff
}
type RWalk struct {
Header
Nwqid uint16
Wqid []Qid
}
func (walk *RWalk) String() string {
ret := fmt.Sprintf("rwalk: [%s, nwqid: %d, wqid: <",
&walk.Header, walk.Nwqid)
for _, qid := range walk.Wqid {
ret += fmt.Sprintf("<%s>, ", &qid)
}
ret += ">]"
return ret
}
func (walk *RWalk) parse(buff []byte) ([]byte, error) {
walk.Nwqid, buff = fromLittleE16(buff)
walk.Wqid = make([]Qid, walk.Nwqid)
var i uint16
var err error
for ; i < walk.Nwqid; i++ {
buff, err = walk.Wqid[i].parse(buff)
if err != nil {
return nil, err
}
}
return buff, nil
}
func (walk *RWalk) Compose() []byte {
// size[4] Rwalk tag[2] nwqid[2] nwqid*(wqid[13])
length := 4 + 1 + 2 + 2 + (walk.Nwqid * 13)
buff := make([]byte, length)
buffer := buff
buffer = toLittleE32(uint32(length), buffer)
buffer[0] = walk.Type
buffer = buffer[1:]
buffer = toLittleE16(walk.Tag, buffer)
buffer = toLittleE16(walk.Nwqid, buffer)
for _, qid := range walk.Wqid {
qidbuff := qid.Compose()
copy(buffer, qidbuff)
buffer = buffer[len(qidbuff):]
}
return buff
}