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/** @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;
GuidPtr = (GUID*)Buffer;
Buffer = GuidPtr + Length / sizeof (*GuidPtr);
while (GuidPtr < (CONST GUID*)Buffer) {
if (CompareGuid (GuidPtr, Guid)) {
return (VOID*)GuidPtr;
}
GuidPtr++;
}
return NULL;
}
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