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89 lines
1.9 KiB
89 lines
1.9 KiB
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package packet
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import (
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"encoding/binary"
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"io"
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)
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// LiteralData represents an encrypted file. See RFC 4880, section 5.9.
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type LiteralData struct {
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IsBinary bool
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FileName string
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Time uint32 // Unix epoch time. Either creation time or modification time. 0 means undefined.
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Body io.Reader
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}
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// ForEyesOnly returns whether the contents of the LiteralData have been marked
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// as especially sensitive.
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func (l *LiteralData) ForEyesOnly() bool {
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return l.FileName == "_CONSOLE"
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}
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func (l *LiteralData) parse(r io.Reader) (err error) {
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var buf [256]byte
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_, err = readFull(r, buf[:2])
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if err != nil {
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return
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}
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l.IsBinary = buf[0] == 'b'
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fileNameLen := int(buf[1])
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_, err = readFull(r, buf[:fileNameLen])
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if err != nil {
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return
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}
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l.FileName = string(buf[:fileNameLen])
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_, err = readFull(r, buf[:4])
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if err != nil {
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return
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}
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l.Time = binary.BigEndian.Uint32(buf[:4])
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l.Body = r
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return
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}
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// SerializeLiteral serializes a literal data packet to w and returns a
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// WriteCloser to which the data itself can be written and which MUST be closed
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// on completion. The fileName is truncated to 255 bytes.
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func SerializeLiteral(w io.WriteCloser, isBinary bool, fileName string, time uint32) (plaintext io.WriteCloser, err error) {
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var buf [4]byte
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buf[0] = 't'
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if isBinary {
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buf[0] = 'b'
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}
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if len(fileName) > 255 {
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fileName = fileName[:255]
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}
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buf[1] = byte(len(fileName))
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inner, err := serializeStreamHeader(w, packetTypeLiteralData)
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if err != nil {
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return
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}
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_, err = inner.Write(buf[:2])
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if err != nil {
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return
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}
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_, err = inner.Write([]byte(fileName))
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if err != nil {
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return
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}
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binary.BigEndian.PutUint32(buf[:], time)
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_, err = inner.Write(buf[:])
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if err != nil {
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return
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}
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plaintext = inner
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return
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}
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