69 lines
1.3 KiB
Go
69 lines
1.3 KiB
Go
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package protocol
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import (
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"bytes"
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"net"
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"github.com/Dreamacro/clash/common/pool"
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)
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// NewConn wraps a stream-oriented net.Conn with protocol decoding/encoding
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func NewConn(c net.Conn, p Protocol, iv []byte) net.Conn {
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return &Conn{Conn: c, Protocol: p.initForConn(iv)}
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}
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// Conn represents a protocol connection
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type Conn struct {
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net.Conn
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Protocol
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buf []byte
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offset int
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underDecoded bytes.Buffer
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}
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func (c *Conn) Read(b []byte) (int, error) {
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if c.buf != nil {
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n := copy(b, c.buf[c.offset:])
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c.offset += n
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if c.offset == len(c.buf) {
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c.buf = nil
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}
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return n, nil
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}
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buf := pool.Get(pool.RelayBufferSize)
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defer pool.Put(buf)
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n, err := c.Conn.Read(buf)
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if err != nil {
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return 0, err
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}
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c.underDecoded.Write(buf[:n])
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underDecoded := c.underDecoded.Bytes()
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decoded, length, err := c.Decode(underDecoded)
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if err != nil {
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c.underDecoded.Reset()
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return 0, nil
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}
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if length == 0 {
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return 0, nil
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}
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c.underDecoded.Next(length)
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n = copy(b, decoded)
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if len(decoded) > len(b) {
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c.buf = decoded
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c.offset = n
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}
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return n, nil
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}
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func (c *Conn) Write(b []byte) (int, error) {
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encoded, err := c.Encode(b)
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if err != nil {
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return 0, err
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}
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_, err = c.Conn.Write(encoded)
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if err != nil {
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return 0, err
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}
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return len(b), nil
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}
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