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878ddf1f | 1 | /** @file\r |
2 | Implementation of GUID functions.\r | |
3 | \r | |
4 | Copyright (c) 2006, Intel Corporation<BR>\r | |
5 | All rights reserved. This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | Module Name: MemLibGuid.c\r | |
14 | \r | |
15 | The following BaseMemoryLib instances share the same version of this file:\r | |
16 | \r | |
17 | BaseMemoryLib\r | |
18 | BaseMemoryLibMmx\r | |
19 | BaseMemoryLibSse2\r | |
20 | BaseMemoryLibRepStr\r | |
21 | PeiMemoryLib\r | |
22 | UefiMemoryLib\r | |
23 | \r | |
24 | **/\r | |
25 | \r | |
26 | /**\r | |
27 | This function copies a source GUID to a destination GUID.\r | |
28 | \r | |
29 | This function copies the contents of the 128-bit GUID specified by SourceGuid\r | |
30 | to DestinationGuid, and returns DestinationGuid.\r | |
31 | \r | |
32 | If DestinationGuid is NULL, then ASSERT().\r | |
33 | If SourceGuid is NULL, then ASSERT().\r | |
34 | \r | |
35 | @param DestinationGuid Pointer to the destination GUID.\r | |
36 | @param SourceGuid Pointer to the source GUID.\r | |
37 | \r | |
38 | @return DestinationGuid\r | |
39 | \r | |
40 | **/\r | |
41 | GUID *\r | |
42 | EFIAPI\r | |
43 | CopyGuid (\r | |
44 | OUT GUID *DestinationGuid,\r | |
45 | IN CONST GUID *SourceGuid\r | |
46 | )\r | |
47 | {\r | |
48 | WriteUnaligned64 (\r | |
49 | (UINT64*)DestinationGuid,\r | |
50 | ReadUnaligned64 ((CONST UINT64*)SourceGuid)\r | |
51 | );\r | |
52 | WriteUnaligned64 (\r | |
53 | (UINT64*)DestinationGuid + 1,\r | |
54 | ReadUnaligned64 ((CONST UINT64*)SourceGuid + 1)\r | |
55 | );\r | |
56 | return DestinationGuid;\r | |
57 | }\r | |
58 | \r | |
59 | /**\r | |
60 | Compares two GUIDs\r | |
61 | \r | |
62 | This function compares Guid1 to Guid2. If the GUIDs are identical then TRUE\r | |
63 | is returned. If there are any bit differences in the two GUIDs, then FALSE is\r | |
64 | returned.\r | |
65 | \r | |
66 | If Guid1 is NULL, then ASSERT().\r | |
67 | If Guid2 is NULL, then ASSERT().\r | |
68 | \r | |
69 | @param Guid1 guid to compare\r | |
70 | @param Guid2 guid to compare\r | |
71 | \r | |
72 | @retval TRUE if Guid1 == Guid2\r | |
73 | @retval FALSE if Guid1 != Guid2\r | |
74 | \r | |
75 | **/\r | |
76 | BOOLEAN\r | |
77 | EFIAPI\r | |
78 | CompareGuid (\r | |
79 | IN CONST GUID *Guid1,\r | |
80 | IN CONST GUID *Guid2\r | |
81 | )\r | |
82 | {\r | |
83 | return (BOOLEAN)(\r | |
84 | ReadUnaligned64 ((CONST UINT64*)Guid1)\r | |
85 | == ReadUnaligned64 ((CONST UINT64*)Guid2) &&\r | |
86 | ReadUnaligned64 ((CONST UINT64*)Guid1 + 1)\r | |
87 | == ReadUnaligned64 ((CONST UINT64*)Guid2 + 1)\r | |
88 | );\r | |
89 | }\r | |
90 | \r | |
91 | /**\r | |
92 | Scans a target buffer for a GUID, and returns a pointer to the matching GUID\r | |
93 | in the target buffer.\r | |
94 | \r | |
95 | This function searches target the buffer specified by Buffer and Length from\r | |
96 | the lowest address to the highest address at 128-bit increments for the\r | |
97 | 128-bit GUID value that matches Guid. If a match is found, then a pointer to\r | |
98 | the matching GUID in the target buffer is returned. If no match is found,\r | |
99 | then NULL is returned. If Length is 0, then NULL is returned.\r | |
100 | \r | |
101 | If Buffer is NULL, then ASSERT().\r | |
102 | If Buffer is not aligned on a 64-bit boundary, then ASSERT().\r | |
103 | If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r | |
104 | \r | |
105 | @param Buffer Pointer to the target buffer to scan.\r | |
106 | @param Length Number of bytes in Buffer to scan.\r | |
107 | @param Guid Value to search for in the target buffer.\r | |
108 | \r | |
109 | @return Pointer to the first occurrence.\r | |
110 | @retval NULL if Length == 0 or Guid was not found.\r | |
111 | **/\r | |
112 | VOID *\r | |
113 | EFIAPI\r | |
114 | ScanGuid (\r | |
115 | IN CONST VOID *Buffer,\r | |
116 | IN UINTN Length,\r | |
117 | IN CONST GUID *Guid\r | |
118 | )\r | |
119 | {\r | |
120 | CONST GUID *GuidPtr;\r | |
121 | \r | |
122 | GuidPtr = (GUID*)Buffer;\r | |
123 | Buffer = GuidPtr + Length / sizeof (*GuidPtr);\r | |
124 | while (GuidPtr < (CONST GUID*)Buffer) {\r | |
125 | if (CompareGuid (GuidPtr, Guid)) {\r | |
126 | return (VOID*)GuidPtr;\r | |
127 | }\r | |
128 | GuidPtr++;\r | |
129 | }\r | |
130 | return NULL;\r | |
131 | }\r |