mirror of https://github.com/acidanthera/audk.git
136 lines
3.9 KiB
C
136 lines
3.9 KiB
C
/** @file
|
||
Implementation of GUID functions.
|
||
|
||
Copyright (c) 2006, Intel Corporation<BR>
|
||
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.
|
||
|
||
Module Name: MemLibGuid.c
|
||
|
||
The following BaseMemoryLib instances share the same version of this file:
|
||
|
||
BaseMemoryLib
|
||
BaseMemoryLibMmx
|
||
BaseMemoryLibSse2
|
||
BaseMemoryLibRepStr
|
||
PeiMemoryLib
|
||
UefiMemoryLib
|
||
|
||
**/
|
||
|
||
/**
|
||
Copies a source GUID to a destination GUID.
|
||
|
||
This function copies the contents of the 128-bit GUID specified by SourceGuid to
|
||
DestinationGuid, and returns DestinationGuid.
|
||
If DestinationGuid is NULL, then ASSERT().
|
||
If SourceGuid is NULL, then ASSERT().
|
||
|
||
@param DestinationGuid Pointer to the destination GUID.
|
||
@param SourceGuid Pointer to the source GUID.
|
||
|
||
@return DestinationGuid.
|
||
|
||
**/
|
||
GUID *
|
||
EFIAPI
|
||
CopyGuid (
|
||
OUT GUID *DestinationGuid,
|
||
IN CONST GUID *SourceGuid
|
||
)
|
||
{
|
||
WriteUnaligned64 (
|
||
(UINT64*)DestinationGuid,
|
||
ReadUnaligned64 ((CONST UINT64*)SourceGuid)
|
||
);
|
||
WriteUnaligned64 (
|
||
(UINT64*)DestinationGuid + 1,
|
||
ReadUnaligned64 ((CONST UINT64*)SourceGuid + 1)
|
||
);
|
||
return DestinationGuid;
|
||
}
|
||
|
||
/**
|
||
Compares two GUIDs.
|
||
|
||
This function compares Guid1 to Guid2. If the GUIDs are identical then TRUE is returned.
|
||
If there are any bit differences in the two GUIDs, then FALSE is returned.
|
||
If Guid1 is NULL, then ASSERT().
|
||
If Guid2 is NULL, then ASSERT().
|
||
|
||
@param Guid1 A pointer to a 128 bit GUID.
|
||
@param Guid2 A pointer to a 128 bit GUID.
|
||
|
||
@retval TRUE Guid1 and Guid2 are identical.
|
||
@retval FALSE Guid1 and Guid2 are not identical.
|
||
|
||
**/
|
||
BOOLEAN
|
||
EFIAPI
|
||
CompareGuid (
|
||
IN CONST GUID *Guid1,
|
||
IN CONST GUID *Guid2
|
||
)
|
||
{
|
||
return (BOOLEAN)(
|
||
ReadUnaligned64 ((CONST UINT64*)Guid1)
|
||
== ReadUnaligned64 ((CONST UINT64*)Guid2) &&
|
||
ReadUnaligned64 ((CONST UINT64*)Guid1 + 1)
|
||
== ReadUnaligned64 ((CONST UINT64*)Guid2 + 1)
|
||
);
|
||
}
|
||
|
||
/**
|
||
Scans a target buffer for a GUID, and returns a pointer to the matching GUID
|
||
in the target buffer.
|
||
|
||
This function searches target the buffer specified by Buffer and Length from
|
||
the lowest address to the highest address at 128-bit increments for the 128-bit
|
||
GUID value that matches Guid. If a match is found, then a pointer to the matching
|
||
GUID in the target buffer is returned. If no match is found, then NULL is returned.
|
||
If Length is 0, then NULL is returned.
|
||
If Length > 0 and Buffer is NULL, then ASSERT().
|
||
If Buffer is not aligned on a 64-bit boundary, then ASSERT().
|
||
If Length is greater than (MAX_ADDRESS <20> Buffer + 1), then ASSERT().
|
||
|
||
@param Buffer Pointer to the target buffer to scan.
|
||
@param Length Number of bytes in Buffer to scan.
|
||
@param Guid Value to search for in the target buffer.
|
||
|
||
@return A pointer to the matching Guid in the target buffer or NULL otherwise.
|
||
|
||
**/
|
||
VOID *
|
||
EFIAPI
|
||
ScanGuid (
|
||
IN CONST VOID *Buffer,
|
||
IN UINTN Length,
|
||
IN CONST GUID *Guid
|
||
)
|
||
{
|
||
CONST GUID *GuidPtr;
|
||
|
||
ASSERT (Buffer != NULL);
|
||
//
|
||
// Make sure Buffer is aligned on a 64-bit boundary.
|
||
//
|
||
ASSERT (((UINTN) Buffer & 7) == 0);
|
||
|
||
ASSERT (Length <= (MAX_ADDRESS - (UINTN)Buffer + 1));
|
||
|
||
GuidPtr = (GUID*)Buffer;
|
||
Buffer = GuidPtr + Length / sizeof (*GuidPtr);
|
||
while (GuidPtr < (CONST GUID*)Buffer) {
|
||
if (CompareGuid (GuidPtr, Guid)) {
|
||
return (VOID*)GuidPtr;
|
||
}
|
||
GuidPtr++;
|
||
}
|
||
return NULL;
|
||
}
|