blob: a10b34611c861b761e24f4833e796ed12e94ed9d (
plain)
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
72
73
74
|
/*
Copyright (C) 2009 Red Hat, Inc.
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, see <http://www.gnu.org/licenses/>.
*/
#ifndef _H_VDI_PORT
#define _H_VDI_PORT
#include <windows.h>
#include <stdint.h>
#define BUF_SIZE (1024 * 1024)
#define VDI_PORT_BLOCKED 0
#define VDI_PORT_RESET -1
#define VDI_PORT_ERROR -2
typedef struct VDIPortBuffer {
OVERLAPPED overlap;
uint8_t* start;
uint8_t* end;
bool pending;
int bytes;
uint8_t ring[BUF_SIZE];
} VDIPortBuffer;
class VDIPort {
public:
VDIPort();
~VDIPort();
bool init();
size_t ring_write(const void* buf, size_t size);
size_t write_ring_free_space();
size_t ring_read(void* buf, size_t size);
size_t read_ring_size();
size_t read_ring_continuous_remaining_size();
HANDLE get_write_event() { return _write.overlap.hEvent; }
HANDLE get_read_event() { return _read.overlap.hEvent; }
int write();
int read();
void write_completion();
void read_completion();
private:
int handle_error();
private:
static VDIPort* _singleton;
HANDLE _handle;
VDIPortBuffer _write;
VDIPortBuffer _read;
};
// Ring notes:
// _end is one after the end of data
// _start==_end means empty ring
// _start-1==_end (modulo) means full ring
// _start-1 is never used
// ring_write & read on right side of the ring (update _end)
// ring_read & write from left (update _start)
#endif
|
