1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
/*
* Copyright (C) 2003-2014 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_GZIP_OUTPUT_STREAM_HXX
#define MPD_GZIP_OUTPUT_STREAM_HXX
#include "check.h"
#include "OutputStream.hxx"
#include <assert.h>
#include <zlib.h>
class Error;
class Domain;
extern const Domain zlib_domain;
/**
* A filter that compresses data written to it using zlib, forwarding
* compressed data in the "gzip" format.
*
* Don't forget to call Flush() before destructing this object.
*/
class GzipOutputStream final : public OutputStream {
OutputStream &next;
z_stream z;
public:
/**
* Construct the filter. Call IsDefined() to check whether
* the constructor has succeeded. If not, #error will hold
* information about the failure.
*/
GzipOutputStream(OutputStream &_next, Error &error);
~GzipOutputStream();
/**
* Check whether the constructor has succeeded.
*/
bool IsDefined() const {
return z.opaque == nullptr;
}
/**
* Finish the file and write all data remaining in zlib's
* output buffer.
*/
bool Flush(Error &error);
/* virtual methods from class OutputStream */
bool Write(const void *data, size_t size, Error &error) override;
};
#endif
|
