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
|
/*
* This file is part of the coreboot project.
*
* Copyright 2015 Google 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; version 2 of the License.
*
* 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.
*/
#ifndef _COMMONLIB_CBFS_H_
#define _COMMONLIB_CBFS_H_
#include <commonlib/cbfs_serialized.h>
#include <commonlib/region.h>
#include <vb2_api.h>
/* Object representing cbfs files. */
struct cbfsf {
struct region_device metadata;
struct region_device data;
};
/* Locate file by name and optional type. Returns 0 on succcess else < 0 on
* error.*/
int cbfs_locate(struct cbfsf *fh, const struct region_device *cbfs,
const char *name, uint32_t *type);
static inline void cbfs_file_data(struct region_device *data,
const struct cbfsf *file)
{
rdev_chain(data, &file->data, 0, region_device_sz(&file->data));
}
static inline void cbfs_file_metadata(struct region_device *metadata,
const struct cbfsf *file)
{
rdev_chain(metadata, &file->metadata, 0,
region_device_sz(&file->metadata));
}
/*
* Provide a handle to each cbfs file within a cbfs. The prev pointer represents
* the previous file (NULL on first invocation). The next object gets filled
* out with the next file. This returns < 0 on error, 0 on finding the next
* file, and > 0 at end of cbfs.
*/
int cbfs_for_each_file(const struct region_device *cbfs,
const struct cbfsf *prev, struct cbfsf *fh);
/*
* Return the offset for each CBFS attribute in a CBFS file metadata region.
* The metadata must already be fully mapped by the caller. Will return the
* offset (relative to the start of the metadata) or 0 when there are no
* further attributes. Should be called with 0 to begin, then always with
* the previously returned value until it returns 0.
*/
size_t cbfs_for_each_attr(void *metadata, size_t metadata_size,
size_t last_offset);
/*
* Find out the decompression algorithm and decompressed size of a non-stage
* CBFS file (by parsing its metadata attributes), and return them with
* out-parameters. Returns 0 on success and < 0 on error.
*/
int cbfsf_decompression_info(struct cbfsf *fh, uint32_t *algo, size_t *size);
/*
* Return the CBFS file type as out-parameter.
* Returns 0 on success and < 0 on error.
*/
int cbfsf_file_type(struct cbfsf *fh, uint32_t *ftype);
/*
* Perform the vb2 hash over the CBFS region skipping empty file contents.
* Caller is responsible for providing the hash algorithm as well as storage
* for the final digest. Return 0 on success or non-zero on error.
*/
int cbfs_vb2_hash_contents(const struct region_device *cbfs,
enum vb2_hash_algorithm hash_alg, void *digest,
size_t digest_sz);
#endif
|
