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compress.go
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compress.go
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package snet
import (
"io"
"net"
"github.com/klauspost/compress/zstd"
)
// A CompressConn is able to compress/decompress a net Conn by using zstandard codec.
// It does not close its given net.Conn.
type CompressConn struct {
net.Conn
r *zstd.Decoder
w *zstd.Encoder
}
// Compress returns a CompressConn.
func Compress(c net.Conn) (net.Conn, error) {
r, err := zstd.NewReader(c, zstd.WithDecoderConcurrency(2), zstd.WithDecoderLowmem(true))
if err != nil {
return nil, err
}
w, err := zstd.NewWriter(c, zstd.WithEncoderConcurrency(2), zstd.WithWindowSize(128<<10))
if err != nil {
return nil, err
}
return &CompressConn{
Conn: c,
r: r,
w: w,
}, nil
}
func (c *CompressConn) Read(p []byte) (n int, err error) {
n, err = c.r.Read(p)
if err == io.ErrUnexpectedEOF {
// ErrUnexpectedEOF is returned when connection is closed.
// FIXME: Can ErrUnexpectedEOF be returned even if the connection is not closed?
err = io.EOF
}
return
}
func (c *CompressConn) Write(p []byte) (n int, err error) {
defer c.w.Flush()
return c.w.Write(p)
}
// Close implements io.Close.
func (c *CompressConn) Close() error {
c.r.Close()
return c.w.Close()
}