maddy

 1/*
 2Maddy Mail Server - Composable all-in-one email server.
 3Copyright © 2019-2020 Max Mazurov <fox.cpp@disroot.org>, Maddy Mail Server contributors
 4
 5This program is free software: you can redistribute it and/or modify
 6it under the terms of the GNU General Public License as published by
 7the Free Software Foundation, either version 3 of the License, or
 8(at your option) any later version.
 9
10This program is distributed in the hope that it will be useful,
11but WITHOUT ANY WARRANTY; without even the implied warranty of
12MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13GNU General Public License for more details.
14
15You should have received a copy of the GNU General Public License
16along with this program.  If not, see <https://www.gnu.org/licenses/>.
17*/
18
19package buffer
20
21import (
22	"io"
23)
24
25// MemoryBuffer implements Buffer interface using byte slice.
26type MemoryBuffer struct {
27	Slice []byte
28}
29
30func (mb MemoryBuffer) Open() (io.ReadCloser, error) {
31	return NewBytesReader(mb.Slice), nil
32}
33
34func (mb MemoryBuffer) Len() int {
35	return len(mb.Slice)
36}
37
38func (mb MemoryBuffer) Remove() error {
39	return nil
40}
41
42// BufferInMemory is a convenience function which creates MemoryBuffer with
43// contents of the passed io.Reader.
44func BufferInMemory(r io.Reader) (Buffer, error) {
45	blob, err := io.ReadAll(r)
46	if err != nil {
47		return nil, err
48	}
49	return MemoryBuffer{Slice: blob}, nil
50}