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
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2002,2007 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef GRUB_FILE_HEADER
#define GRUB_FILE_HEADER 1
#include <grub/types.h>
#include <grub/err.h>
#include <grub/device.h>
#include <grub/fs.h>
#include <grub/disk.h>
/* File description. */
struct grub_file
{
/* File name. */
char *name;
/* The underlying device. */
grub_device_t device;
/* The underlying filesystem. */
grub_fs_t fs;
/* The current offset. */
grub_off_t offset;
grub_off_t progress_offset;
/* Progress info. */
grub_uint64_t last_progress_time;
grub_off_t last_progress_offset;
grub_uint64_t estimated_speed;
/* The file size. */
grub_off_t size;
/* If file is not easily seekable. Should be set by underlying layer. */
int not_easily_seekable;
/* Filesystem-specific data. */
void *data;
/* This is called when a sector is read. Used only for a disk device. */
grub_disk_read_hook_t read_hook;
/* Caller-specific data passed to the read hook. */
void *read_hook_data;
};
typedef struct grub_file *grub_file_t;
extern grub_disk_read_hook_t EXPORT_VAR(grub_file_progress_hook);
/* Filters with lower ID are executed first. */
typedef enum grub_file_filter_id
{
GRUB_FILE_FILTER_PUBKEY,
GRUB_FILE_FILTER_GZIO,
GRUB_FILE_FILTER_XZIO,
GRUB_FILE_FILTER_LZOPIO,
GRUB_FILE_FILTER_MAX,
GRUB_FILE_FILTER_COMPRESSION_FIRST = GRUB_FILE_FILTER_GZIO,
GRUB_FILE_FILTER_COMPRESSION_LAST = GRUB_FILE_FILTER_LZOPIO,
} grub_file_filter_id_t;
typedef grub_file_t (*grub_file_filter_t) (grub_file_t in, const char *filename);
extern grub_file_filter_t EXPORT_VAR(grub_file_filters_all)[GRUB_FILE_FILTER_MAX];
extern grub_file_filter_t EXPORT_VAR(grub_file_filters_enabled)[GRUB_FILE_FILTER_MAX];
static inline void
grub_file_filter_register (grub_file_filter_id_t id, grub_file_filter_t filter)
{
grub_file_filters_all[id] = filter;
grub_file_filters_enabled[id] = filter;
}
static inline void
grub_file_filter_unregister (grub_file_filter_id_t id)
{
grub_file_filters_all[id] = 0;
grub_file_filters_enabled[id] = 0;
}
static inline void
grub_file_filter_disable (grub_file_filter_id_t id)
{
grub_file_filters_enabled[id] = 0;
}
static inline void
grub_file_filter_disable_compression (void)
{
grub_file_filter_id_t id;
for (id = GRUB_FILE_FILTER_COMPRESSION_FIRST;
id <= GRUB_FILE_FILTER_COMPRESSION_LAST; id++)
grub_file_filters_enabled[id] = 0;
}
static inline void
grub_file_filter_disable_all (void)
{
grub_file_filter_id_t id;
for (id = 0;
id < GRUB_FILE_FILTER_MAX; id++)
grub_file_filters_enabled[id] = 0;
}
static inline void
grub_file_filter_disable_pubkey (void)
{
grub_file_filters_enabled[GRUB_FILE_FILTER_PUBKEY] = 0;
}
/* Get a device name from NAME. */
char *EXPORT_FUNC(grub_file_get_device_name) (const char *name);
grub_file_t EXPORT_FUNC(grub_file_open) (const char *name);
grub_ssize_t EXPORT_FUNC(grub_file_read) (grub_file_t file, void *buf,
grub_size_t len);
grub_off_t EXPORT_FUNC(grub_file_seek) (grub_file_t file, grub_off_t offset);
grub_err_t EXPORT_FUNC(grub_file_close) (grub_file_t file);
/* Return value of grub_file_size() in case file size is unknown. */
#define GRUB_FILE_SIZE_UNKNOWN 0xffffffffffffffffULL
static inline grub_off_t
grub_file_size (const grub_file_t file)
{
return file->size;
}
static inline grub_off_t
grub_file_tell (const grub_file_t file)
{
return file->offset;
}
static inline int
grub_file_seekable (const grub_file_t file)
{
return !file->not_easily_seekable;
}
grub_file_t
grub_file_offset_open (grub_file_t parent, grub_off_t start,
grub_off_t size);
void
grub_file_offset_close (grub_file_t file);
#endif /* ! GRUB_FILE_HEADER */
|
