code review 4124054: crypto/openpgp/packet: two more packet types.

src/pkg/crypto/openpgp/packet/compressed.go

+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+        "compress/flate"
+        "compress/zlib"
+        "crypto/openpgp/error"
+        "io"
+        "os"
+        "strconv"
+)
+
+// Compressed represents a compressed OpenPGP packet. The decompressed contents
+// will contain more OpenPGP packets. See RFC 4880, section 5.6.
+type Compressed struct {
+        Body io.Reader
+}
+
+func (c *Compressed) parse(r io.Reader) os.Error {
+        var buf [1]byte
+        _, err := readFull(r, buf[:])
+        if err != nil {
+                return err
+        }
+
+        switch buf[0] {
+        case 1:
+                c.Body = flate.NewReader(r)
+        case 2:
+                c.Body, err = zlib.NewReader(r)
+        default:
+                err = error.UnsupportedError("unknown compression algorithm: " + strconv.Itoa(int(buf[0])))
+        }
+
+        return err
+}