mirror of https://github.com/acidanthera/audk.git
140 lines
3.9 KiB
C
140 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
|
|
|
|
**/
|
|
|
|
/**
|
|
This function 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 guid to compare
|
|
@param Guid2 guid to compare
|
|
|
|
@retval TRUE if Guid1 == Guid2
|
|
@retval FALSE if Guid1 != Guid2
|
|
|
|
**/
|
|
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 Buffer is NULL, then ASSERT().
|
|
If Buffer is not aligned on a 64-bit boundary, then ASSERT().
|
|
If Length is greater than (MAX_ADDRESS - 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 Pointer to the first occurrence.
|
|
@retval NULL if Length == 0 or Guid was not found.
|
|
**/
|
|
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;
|
|
}
|