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zlib.go
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zlib.go
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package transports
import (
"compress/zlib"
"io"
"time"
)
type zlibTransport struct {
r io.ReadCloser
w *zlib.Writer
trans Transport
}
func NewZlib(trans Transport, level int) (Transport, error) {
w, err := zlib.NewWriterLevel(trans, level)
if err != nil {
return nil, err
}
return &zlibTransport{
w: w,
trans: trans,
}, nil
}
func (t *zlibTransport) Close() error {
if t.r != nil {
err := t.r.Close()
if err != nil {
return err
}
}
err := t.w.Close()
if err != nil {
return err
}
return t.trans.Close()
}
func (t *zlibTransport) Read(p []byte) (int, error) {
// Use lazy initialization of a reader because it immediately starts reading a header
// so may hang if there is no data in the underlying transport
if t.r == nil {
r, err := zlib.NewReader(t.trans)
if err != nil {
return 0, err
}
t.r = r
}
return t.r.Read(p)
}
func (t *zlibTransport) Write(p []byte) (int, error) {
return t.w.Write(p)
}
func (t *zlibTransport) Flush() error {
err := t.w.Flush()
if err != nil {
return err
}
return t.trans.Flush()
}
func (t *zlibTransport) SetDeadline(d time.Time) error {
return t.trans.SetDeadline(d)
}