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// 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 (
"crypto/openpgp/error"
"io"
"os"
)
// Reader reads packets from an io.Reader and allows packets to be 'unread' so
// that they result from the next call to Next.
type Reader struct {
q []Packet
readers []io.Reader
}
// Next returns the most recently unread Packet, or reads another packet from
// the top-most io.Reader. Unknown packet types are skipped.
func (r *Reader) Next() (p Packet, err os.Error) {
if len(r.q) > 0 {
p = r.q[len(r.q)-1]
r.q = r.q[:len(r.q)-1]
return
}
for len(r.readers) > 0 {
p, err = Read(r.readers[len(r.readers)-1])
if err == nil {
return
}
if err == os.EOF {
r.readers = r.readers[:len(r.readers)-1]
continue
}
if _, ok := err.(error.UnknownPacketTypeError); !ok {
return nil, err
}
}
return nil, os.EOF
}
// Push causes the Reader to start reading from a new io.Reader. When an EOF
// error is seen from the new io.Reader, it is popped and the Reader continues
// to read from the next most recent io.Reader.
func (r *Reader) Push(reader io.Reader) {
r.readers = append(r.readers, reader)
}
// Unread causes the given Packet to be returned from the next call to Next.
func (r *Reader) Unread(p Packet) {
r.q = append(r.q, p)
}
func NewReader(r io.Reader) *Reader {
return &Reader{
q: nil,
readers: []io.Reader{r},
}
}
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