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
|
/** @file
The Decompress Protocol Interface as defined in UEFI spec
Copyright (c) 2006 - 2008, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#ifndef __DECOMPRESS_H__
#define __DECOMPRESS_H__
#define EFI_DECOMPRESS_PROTOCOL_GUID \
{ \
0xd8117cfe, 0x94a6, 0x11d4, {0x9a, 0x3a, 0x0, 0x90, 0x27, 0x3f, 0xc1, 0x4d } \
}
typedef struct _EFI_DECOMPRESS_PROTOCOL EFI_DECOMPRESS_PROTOCOL;
/**
The GetInfo() function retrieves the size of the uncompressed buffer
and the temporary scratch buffer required to decompress the buffer
specified by Source and SourceSize. If the size of the uncompressed
buffer or the size of the scratch buffer cannot be determined from
the compressed data specified by Source and SourceData, then
EFI_INVALID_PARAMETER is returned. Otherwise, the size of the uncompressed
buffer is returned in DestinationSize, the size of the scratch buffer is
returned in ScratchSize, and EFI_SUCCESS is returned.
The GetInfo() function does not have a scratch buffer available to perform
a thorough checking of the validity of the source data. It just retrieves
the 'Original Size' field from the beginning bytes of the source data and
output it as DestinationSize. And ScratchSize is specific to the decompression
implementation.
@param This A pointer to the EFI_DECOMPRESS_PROTOCOL instance.
@param Source The source buffer containing the compressed data.
@param SourceSize The size, in bytes, of source buffer.
@param DestinationSize A pointer to the size, in bytes, of the uncompressed buffer
that will be generated when the compressed buffer specified
by Source and SourceSize is decompressed.
@param ScratchSize A pointer to the size, in bytes, of the scratch buffer that
is required to decompress the compressed buffer specified by
Source and SourceSize.
@retval EFI_SUCCESS The size of the uncompressed data was returned in DestinationSize
and the size of the scratch buffer was returned in ScratchSize.
@retval EFI_INVALID_PARAMETER The size of the uncompressed data or the size of the scratch
buffer cannot be determined from the compressed data specified by
Source and SourceData.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_DECOMPRESS_GET_INFO)(
IN EFI_DECOMPRESS_PROTOCOL *This,
IN VOID *Source,
IN UINT32 SourceSize,
OUT UINT32 *DestinationSize,
OUT UINT32 *ScratchSize
);
/**
The Decompress() function extracts decompressed data to its original form.
This protocol is designed so that the decompression algorithm can be
implemented without using any memory services. As a result, the
Decompress() function is not allowed to call AllocatePool() or
AllocatePages() in its implementation. It is the caller's responsibility
to allocate and free the Destination and Scratch buffers.
If the compressed source data specified by Source and SourceSize is
sucessfully decompressed into Destination, then EFI_SUCCESS is returned.
If the compressed source data specified by Source and SourceSize is not in
a valid compressed data format, then EFI_INVALID_PARAMETER is returned.
@param This A pointer to the EFI_DECOMPRESS_PROTOCOL instance.
@param Source The source buffer containing the compressed data.
@param SourceSize The size of source data.
@param Destination On output, the destination buffer that contains
the uncompressed data.
@param DestinationSize The size of destination buffer. The size of destination
buffer needed is obtained from GetInfo().
@param Scratch A temporary scratch buffer that is used to perform the
decompression.
@param ScratchSize The size of scratch buffer. The size of scratch buffer needed
is obtained from GetInfo().
@retval EFI_SUCCESS Decompression completed successfully, and the uncompressed
buffer is returned in Destination.
@retval EFI_INVALID_PARAMETER The source buffer specified by Source and SourceSize is
corrupted (not in a valid compressed format).
**/
typedef
EFI_STATUS
(EFIAPI *EFI_DECOMPRESS_DECOMPRESS)(
IN EFI_DECOMPRESS_PROTOCOL *This,
IN VOID *Source,
IN UINT32 SourceSize,
IN OUT VOID *Destination,
IN UINT32 DestinationSize,
IN OUT VOID *Scratch,
IN UINT32 ScratchSize
);
///
/// Provides a decompression service.
///
struct _EFI_DECOMPRESS_PROTOCOL {
EFI_DECOMPRESS_GET_INFO GetInfo;
EFI_DECOMPRESS_DECOMPRESS Decompress;
};
extern EFI_GUID gEfiDecompressProtocolGuid;
#endif
|
