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mbox.go
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mbox.go
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// Copyright (c) 2017 Nicolas Martyanoff <khaelin@gmail.com>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
package mbox
import (
"errors"
"fmt"
"os"
"github.com/galdor/go-stream"
)
type Format string
const (
Mboxrd Format = "mboxrd"
)
func (f *Format) Parse(s string) error {
switch s {
case "mboxrd":
*f = Mboxrd
default:
return errors.New("unknown format")
}
return nil
}
type Mbox struct {
Format Format
file *os.File
stream *stream.Stream
}
func Open(path string, format Format) (*Mbox, error) {
file, err := os.Open(path)
if err != nil {
return nil, err
}
mbox := &Mbox{
Format: format,
file: file,
stream: stream.NewStream(file),
}
return mbox, nil
}
func (mbox *Mbox) Read() (*Message, error) {
// Header
line, err := mbox.stream.ReadUntilAndSkip([]byte{'\r', '\n'})
if err != nil {
return nil, err
} else if line == nil {
return nil, nil
}
id, date, err := ParseMessagePrefix(line)
if err != nil {
return nil, fmt.Errorf("invalid message header: %v", err)
}
// Message
data, err := mbox.stream.ReadUntil([]byte("\r\nFrom "))
if err != nil {
return nil, fmt.Errorf("cannot read message %q: %v", id, err)
}
if data == nil {
// Last message
data, err = mbox.stream.ReadAll()
if err != nil {
return nil, fmt.Errorf("cannot read last message %q: %v", id, err)
}
} else {
err = mbox.stream.Skip(2) // "\r\n"
if err != nil {
return nil, fmt.Errorf("cannot skip end of message header %q: %v",
id, err)
}
}
msg := NewMessage(id, date, UnescapeMessageData(data))
return msg, nil
}
func (mbox *Mbox) Close() {
mbox.file.Close()
mbox.file = nil
mbox.stream = nil
}