]>
git.proxmox.com Git - mirror_edk2.git/blob - MdePkg/Library/UefiMemoryLib/MemLibGuid.c
2 Implementation of GUID functions.
4 The following BaseMemoryLib instances contain the same copy of this file:
15 Copyright (c) 2006 - 2009, Intel Corporation<BR>
16 All rights reserved. This program and the accompanying materials
17 are licensed and made available under the terms and conditions of the BSD License
18 which accompanies this distribution. The full text of the license may be found at
19 http://opensource.org/licenses/bsd-license.php
21 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
22 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
26 #include "MemLibInternals.h"
29 Copies a source GUID to a destination GUID.
31 This function copies the contents of the 128-bit GUID specified by SourceGuid to
32 DestinationGuid, and returns DestinationGuid.
34 If DestinationGuid is NULL, then ASSERT().
35 If SourceGuid is NULL, then ASSERT().
37 @param DestinationGuid Pointer to the destination GUID.
38 @param SourceGuid Pointer to the source GUID.
40 @return DestinationGuid.
46 OUT GUID
*DestinationGuid
,
47 IN CONST GUID
*SourceGuid
51 (UINT64
*)DestinationGuid
,
52 ReadUnaligned64 ((CONST UINT64
*)SourceGuid
)
55 (UINT64
*)DestinationGuid
+ 1,
56 ReadUnaligned64 ((CONST UINT64
*)SourceGuid
+ 1)
58 return DestinationGuid
;
64 This function compares Guid1 to Guid2. If the GUIDs are identical then TRUE is returned.
65 If there are any bit differences in the two GUIDs, then FALSE is returned.
67 If Guid1 is NULL, then ASSERT().
68 If Guid2 is NULL, then ASSERT().
70 @param Guid1 A pointer to a 128 bit GUID.
71 @param Guid2 A pointer to a 128 bit GUID.
73 @retval TRUE Guid1 and Guid2 are identical.
74 @retval FALSE Guid1 and Guid2 are not identical.
84 UINT64 LowPartOfGuid1
;
85 UINT64 LowPartOfGuid2
;
86 UINT64 HighPartOfGuid1
;
87 UINT64 HighPartOfGuid2
;
89 LowPartOfGuid1
= ReadUnaligned64 ((CONST UINT64
*) Guid1
);
90 LowPartOfGuid2
= ReadUnaligned64 ((CONST UINT64
*) Guid2
);
91 HighPartOfGuid1
= ReadUnaligned64 ((CONST UINT64
*) Guid1
+ 1);
92 HighPartOfGuid2
= ReadUnaligned64 ((CONST UINT64
*) Guid2
+ 1);
94 return (BOOLEAN
) (LowPartOfGuid1
== LowPartOfGuid2
&& HighPartOfGuid1
== HighPartOfGuid2
);
98 Scans a target buffer for a GUID, and returns a pointer to the matching GUID
101 This function searches the target buffer specified by Buffer and Length from
102 the lowest address to the highest address at 128-bit increments for the 128-bit
103 GUID value that matches Guid. If a match is found, then a pointer to the matching
104 GUID in the target buffer is returned. If no match is found, then NULL is returned.
105 If Length is 0, then NULL is returned.
107 If Length > 0 and Buffer is NULL, then ASSERT().
108 If Buffer is not aligned on a 32-bit boundary, then ASSERT().
109 If Length is not aligned on a 128-bit boundary, then ASSERT().
110 If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
112 @param Buffer Pointer to the target buffer to scan.
113 @param Length Number of bytes in Buffer to scan.
114 @param Guid Value to search for in the target buffer.
116 @return A pointer to the matching Guid in the target buffer or NULL otherwise.
122 IN CONST VOID
*Buffer
,
129 ASSERT (((UINTN
)Buffer
& (sizeof (Guid
->Data1
) - 1)) == 0);
130 ASSERT (Length
<= (MAX_ADDRESS
- (UINTN
)Buffer
+ 1));
131 ASSERT ((Length
& (sizeof (*GuidPtr
) - 1)) == 0);
133 GuidPtr
= (GUID
*)Buffer
;
134 Buffer
= GuidPtr
+ Length
/ sizeof (*GuidPtr
);
135 while (GuidPtr
< (CONST GUID
*)Buffer
) {
136 if (CompareGuid (GuidPtr
, Guid
)) {
137 return (VOID
*)GuidPtr
;