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1 | /** @file\r | |
2 | Implementation of GUID functions.\r | |
3 | \r | |
4 | The following BaseMemoryLib instances contain the same copy of this file:\r | |
5 | BaseMemoryLib\r | |
6 | BaseMemoryLibMmx\r | |
7 | BaseMemoryLibSse2\r | |
8 | BaseMemoryLibRepStr\r | |
9 | BaseMemoryLibOptDxe\r | |
10 | BaseMemoryLibOptPei\r | |
11 | PeiMemoryLib\r | |
12 | DxeMemoryLib\r | |
13 | \r | |
14 | Copyright (c) 2006, Intel Corporation<BR>\r | |
15 | All rights reserved. This program and the accompanying materials\r | |
16 | are licensed and made available under the terms and conditions of the BSD License\r | |
17 | which accompanies this distribution. The full text of the license may be found at\r | |
18 | http://opensource.org/licenses/bsd-license.php\r | |
19 | \r | |
20 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
21 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
22 | \r | |
23 | **/\r | |
24 | \r | |
25 | \r | |
26 | #include "MemLibInternals.h"\r | |
27 | \r | |
28 | \r | |
29 | /**\r | |
30 | Copies a source GUID to a destination GUID.\r | |
31 | \r | |
32 | This function copies the contents of the 128-bit GUID specified by SourceGuid to\r | |
33 | DestinationGuid, and returns DestinationGuid.\r | |
34 | If DestinationGuid is NULL, then ASSERT().\r | |
35 | If SourceGuid is NULL, then ASSERT().\r | |
36 | \r | |
37 | @param DestinationGuid Pointer to the destination GUID.\r | |
38 | @param SourceGuid Pointer to the source GUID.\r | |
39 | \r | |
40 | @return DestinationGuid.\r | |
41 | \r | |
42 | **/\r | |
43 | GUID *\r | |
44 | EFIAPI\r | |
45 | CopyGuid (\r | |
46 | OUT GUID *DestinationGuid,\r | |
47 | IN CONST GUID *SourceGuid\r | |
48 | )\r | |
49 | {\r | |
50 | WriteUnaligned64 (\r | |
51 | (UINT64*)DestinationGuid,\r | |
52 | ReadUnaligned64 ((CONST UINT64*)SourceGuid)\r | |
53 | );\r | |
54 | WriteUnaligned64 (\r | |
55 | (UINT64*)DestinationGuid + 1,\r | |
56 | ReadUnaligned64 ((CONST UINT64*)SourceGuid + 1)\r | |
57 | );\r | |
58 | return DestinationGuid;\r | |
59 | }\r | |
60 | \r | |
61 | /**\r | |
62 | Compares two GUIDs.\r | |
63 | \r | |
64 | This function compares Guid1 to Guid2. If the GUIDs are identical then TRUE is returned.\r | |
65 | If there are any bit differences in the two GUIDs, then FALSE is returned.\r | |
66 | If Guid1 is NULL, then ASSERT().\r | |
67 | If Guid2 is NULL, then ASSERT().\r | |
68 | \r | |
69 | @param Guid1 A pointer to a 128 bit GUID.\r | |
70 | @param Guid2 A pointer to a 128 bit GUID.\r | |
71 | \r | |
72 | @retval TRUE Guid1 and Guid2 are identical.\r | |
73 | @retval FALSE Guid1 and Guid2 are not identical.\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 | UINT64 LowPartOfGuid1;\r | |
84 | UINT64 LowPartOfGuid2;\r | |
85 | UINT64 HighPartOfGuid1;\r | |
86 | UINT64 HighPartOfGuid2;\r | |
87 | \r | |
88 | LowPartOfGuid1 = ReadUnaligned64 ((CONST UINT64*) Guid1);\r | |
89 | LowPartOfGuid2 = ReadUnaligned64 ((CONST UINT64*) Guid2);\r | |
90 | HighPartOfGuid1 = ReadUnaligned64 ((CONST UINT64*) Guid1 + 1);\r | |
91 | HighPartOfGuid2 = ReadUnaligned64 ((CONST UINT64*) Guid2 + 1);\r | |
92 | \r | |
93 | return (BOOLEAN) (LowPartOfGuid1 == LowPartOfGuid2 && HighPartOfGuid1 == HighPartOfGuid2);\r | |
94 | }\r | |
95 | \r | |
96 | /**\r | |
97 | Scans a target buffer for a GUID, and returns a pointer to the matching GUID\r | |
98 | in the target buffer.\r | |
99 | \r | |
100 | This function searches target the buffer specified by Buffer and Length from\r | |
101 | the lowest address to the highest address at 128-bit increments for the 128-bit\r | |
102 | GUID value that matches Guid. If a match is found, then a pointer to the matching\r | |
103 | GUID in the target buffer is returned. If no match is found, then NULL is returned.\r | |
104 | If Length is 0, then NULL is returned.\r | |
105 | If Length > 0 and Buffer is NULL, then ASSERT().\r | |
106 | If Buffer is not aligned on a 32-bit boundary, then ASSERT().\r | |
107 | If Length is not aligned on a 128-bit boundary, then ASSERT().\r | |
108 | If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT(). \r | |
109 | \r | |
110 | @param Buffer Pointer to the target buffer to scan.\r | |
111 | @param Length Number of bytes in Buffer to scan.\r | |
112 | @param Guid Value to search for in the target buffer.\r | |
113 | \r | |
114 | @return A pointer to the matching Guid in the target buffer or NULL otherwise.\r | |
115 | \r | |
116 | **/\r | |
117 | VOID *\r | |
118 | EFIAPI\r | |
119 | ScanGuid (\r | |
120 | IN CONST VOID *Buffer,\r | |
121 | IN UINTN Length,\r | |
122 | IN CONST GUID *Guid\r | |
123 | )\r | |
124 | {\r | |
125 | CONST GUID *GuidPtr;\r | |
126 | \r | |
127 | ASSERT (((UINTN)Buffer & (sizeof (Guid->Data1) - 1)) == 0);\r | |
128 | ASSERT (Length <= (MAX_ADDRESS - (UINTN)Buffer + 1));\r | |
129 | ASSERT ((Length & (sizeof (*GuidPtr) - 1)) == 0);\r | |
130 | \r | |
131 | GuidPtr = (GUID*)Buffer;\r | |
132 | Buffer = GuidPtr + Length / sizeof (*GuidPtr);\r | |
133 | while (GuidPtr < (CONST GUID*)Buffer) {\r | |
134 | if (CompareGuid (GuidPtr, Guid)) {\r | |
135 | return (VOID*)GuidPtr;\r | |
136 | }\r | |
137 | GuidPtr++;\r | |
138 | }\r | |
139 | return NULL;\r | |
140 | }\r |