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ip_set.go
116 lines (109 loc) · 2.2 KB
/
ip_set.go
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package srs
import (
"encoding/binary"
"io"
"net/netip"
"unsafe"
"github.com/sagernet/sing/common/rw"
"go4.org/netipx"
)
type myIPSet struct {
rr []myIPRange
}
type myIPRange struct {
from netip.Addr
to netip.Addr
}
func readIPSet(reader io.Reader) (*netipx.IPSet, error) {
var version uint8
err := binary.Read(reader, binary.BigEndian, &version)
if err != nil {
return nil, err
}
var length uint64
err = binary.Read(reader, binary.BigEndian, &length)
if err != nil {
return nil, err
}
mySet := &myIPSet{
rr: make([]myIPRange, length),
}
for i := uint64(0); i < length; i++ {
var (
fromLen uint64
toLen uint64
fromAddr netip.Addr
toAddr netip.Addr
)
fromLen, err = rw.ReadUVariant(reader)
if err != nil {
return nil, err
}
fromBytes := make([]byte, fromLen)
_, err = io.ReadFull(reader, fromBytes)
if err != nil {
return nil, err
}
err = fromAddr.UnmarshalBinary(fromBytes)
if err != nil {
return nil, err
}
toLen, err = rw.ReadUVariant(reader)
if err != nil {
return nil, err
}
toBytes := make([]byte, toLen)
_, err = io.ReadFull(reader, toBytes)
if err != nil {
return nil, err
}
err = toAddr.UnmarshalBinary(toBytes)
if err != nil {
return nil, err
}
mySet.rr[i] = myIPRange{fromAddr, toAddr}
}
return (*netipx.IPSet)(unsafe.Pointer(mySet)), nil
}
func writeIPSet(writer io.Writer, set *netipx.IPSet) error {
err := binary.Write(writer, binary.BigEndian, uint8(1))
if err != nil {
return err
}
mySet := (*myIPSet)(unsafe.Pointer(set))
err = binary.Write(writer, binary.BigEndian, uint64(len(mySet.rr)))
if err != nil {
return err
}
for _, rr := range mySet.rr {
var (
fromBinary []byte
toBinary []byte
)
fromBinary, err = rr.from.MarshalBinary()
if err != nil {
return err
}
err = rw.WriteUVariant(writer, uint64(len(fromBinary)))
if err != nil {
return err
}
_, err = writer.Write(fromBinary)
if err != nil {
return err
}
toBinary, err = rr.to.MarshalBinary()
if err != nil {
return err
}
err = rw.WriteUVariant(writer, uint64(len(toBinary)))
if err != nil {
return err
}
_, err = writer.Write(toBinary)
if err != nil {
return err
}
}
return nil
}