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
75
|
#ifndef _GPXE_FILTER_H
#define _GPXE_FILTER_H
/** @file
*
* Data transfer filters
*
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stddef.h>
#include <gpxe/xfer.h>
/**
* Half of a data transfer filter
*
* Embed two of these structures within a structure implementing a
* data transfer filter, and intialise with filter_init(). You can
* then use the filter_xxx() methods as the data transfer interface
* methods as required.
*/
struct xfer_filter_half {
/** Data transfer interface */
struct xfer_interface xfer;
/** Other half of the data transfer filter */
struct xfer_filter_half *other;
};
/**
* Get data transfer interface for the other half of a data transfer filter
*
* @v xfer Data transfer interface
* @ret other Other half's data transfer interface
*/
static inline __attribute__ (( always_inline )) struct xfer_interface *
filter_other_half ( struct xfer_interface *xfer ) {
struct xfer_filter_half *half =
container_of ( xfer, struct xfer_filter_half, xfer );
return &half->other->xfer;
}
extern void filter_close ( struct xfer_interface *xfer, int rc );
extern int filter_vredirect ( struct xfer_interface *xfer, int type,
va_list args );
extern size_t filter_window ( struct xfer_interface *xfer );
extern struct io_buffer * filter_alloc_iob ( struct xfer_interface *xfer,
size_t len );
extern int filter_deliver_iob ( struct xfer_interface *xfer,
struct io_buffer *iobuf,
struct xfer_metadata *meta );
extern int filter_deliver_raw ( struct xfer_interface *xfer, const void *data,
size_t len );
/**
* Initialise a data transfer filter
*
* @v left "Left" half of the filter
* @v left_op Data transfer interface operations for "left" half
* @v right "Right" half of the filter
* @v right_op Data transfer interface operations for "right" half
* @v refcnt Containing object reference counter, or NULL
*/
static inline void filter_init ( struct xfer_filter_half *left,
struct xfer_interface_operations *left_op,
struct xfer_filter_half *right,
struct xfer_interface_operations *right_op,
struct refcnt *refcnt ) {
xfer_init ( &left->xfer, left_op, refcnt );
xfer_init ( &right->xfer, right_op, refcnt );
left->other = right;
right->other = left;
}
#endif /* _GPXE_FILTER_H */
|
