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util.go
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util.go
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package multiaddr
import "fmt"
// Split returns the sub-address portions of a multiaddr.
func Split(m Multiaddr) []Multiaddr {
split, err := bytesSplit(m.Bytes())
if err != nil {
panic(fmt.Errorf("invalid multiaddr %s", m.String()))
}
addrs := make([]Multiaddr, len(split))
for i, addr := range split {
addrs[i] = &multiaddr{bytes: addr}
}
return addrs
}
// Join returns a combination of addresses.
func Join(ms ...Multiaddr) Multiaddr {
length := 0
bs := make([][]byte, len(ms))
for i, m := range ms {
bs[i] = m.Bytes()
length += len(bs[i])
}
bidx := 0
b := make([]byte, length)
for _, mb := range bs {
for i := range mb {
b[bidx] = mb[i]
bidx++
}
}
return &multiaddr{bytes: b}
}
// Cast re-casts a byte slice as a multiaddr. will panic if it fails to parse.
func Cast(b []byte) Multiaddr {
_, err := bytesToString(b)
if err != nil {
panic(fmt.Errorf("multiaddr failed to parse: %s", err))
}
return &multiaddr{bytes: b}
}
// StringCast like Cast, but parses a string. Will also panic if it fails to parse.
func StringCast(s string) Multiaddr {
m, err := NewMultiaddr(s)
if err != nil {
panic(fmt.Errorf("multiaddr failed to parse: %s", err))
}
return m
}