diff options
Diffstat (limited to 'MdeModulePkg/Library/UefiSortLib/UefiSortLib.c')
| -rw-r--r-- | MdeModulePkg/Library/UefiSortLib/UefiSortLib.c | 116 |
1 files changed, 4 insertions, 112 deletions
diff --git a/MdeModulePkg/Library/UefiSortLib/UefiSortLib.c b/MdeModulePkg/Library/UefiSortLib/UefiSortLib.c index 46dc443638..29d8735c22 100644 --- a/MdeModulePkg/Library/UefiSortLib/UefiSortLib.c +++ b/MdeModulePkg/Library/UefiSortLib/UefiSortLib.c @@ -1,7 +1,7 @@ /** @file
Library used for sorting routines.
- Copyright (c) 2009 - 2014, Intel Corporation. All rights reserved. <BR>
+ Copyright (c) 2009 - 2021, Intel Corporation. All rights reserved. <BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
@@ -30,115 +30,6 @@ STATIC EFI_UNICODE_COLLATION_PROTOCOL *mUnicodeCollation = NULL; }
/**
- Worker function for QuickSorting. This function is identical to PerformQuickSort,
- except that is uses the pre-allocated buffer so the in place sorting does not need to
- allocate and free buffers constantly.
-
- Each element must be equal sized.
-
- if BufferToSort is NULL, then ASSERT.
- if CompareFunction is NULL, then ASSERT.
- if Buffer is NULL, then ASSERT.
-
- if Count is < 2 then perform no action.
- if Size is < 1 then perform no action.
-
- @param[in, out] BufferToSort on call a Buffer of (possibly sorted) elements
- on return a buffer of sorted elements
- @param[in] Count the number of elements in the buffer to sort
- @param[in] ElementSize Size of an element in bytes
- @param[in] CompareFunction The function to call to perform the comparison
- of any 2 elements
- @param[in] Buffer Buffer of size ElementSize for use in swapping
-**/
-VOID
-EFIAPI
-QuickSortWorker (
- IN OUT VOID *BufferToSort,
- IN CONST UINTN Count,
- IN CONST UINTN ElementSize,
- IN SORT_COMPARE CompareFunction,
- IN VOID *Buffer
- )
-{
- VOID *Pivot;
- UINTN LoopCount;
- UINTN NextSwapLocation;
-
- ASSERT(BufferToSort != NULL);
- ASSERT(CompareFunction != NULL);
- ASSERT(Buffer != NULL);
-
- if ( Count < 2
- || ElementSize < 1
- ){
- return;
- }
-
- NextSwapLocation = 0;
-
- //
- // pick a pivot (we choose last element)
- //
- Pivot = ((UINT8*)BufferToSort+((Count-1)*ElementSize));
-
- //
- // Now get the pivot such that all on "left" are below it
- // and everything "right" are above it
- //
- for ( LoopCount = 0
- ; LoopCount < Count -1
- ; LoopCount++
- ){
- //
- // if the element is less than the pivot
- //
- if (CompareFunction((VOID*)((UINT8*)BufferToSort+((LoopCount)*ElementSize)),Pivot) <= 0){
- //
- // swap
- //
- CopyMem (Buffer, (UINT8*)BufferToSort+(NextSwapLocation*ElementSize), ElementSize);
- CopyMem ((UINT8*)BufferToSort+(NextSwapLocation*ElementSize), (UINT8*)BufferToSort+((LoopCount)*ElementSize), ElementSize);
- CopyMem ((UINT8*)BufferToSort+((LoopCount)*ElementSize), Buffer, ElementSize);
-
- //
- // increment NextSwapLocation
- //
- NextSwapLocation++;
- }
- }
- //
- // swap pivot to it's final position (NextSwapLocaiton)
- //
- CopyMem (Buffer, Pivot, ElementSize);
- CopyMem (Pivot, (UINT8*)BufferToSort+(NextSwapLocation*ElementSize), ElementSize);
- CopyMem ((UINT8*)BufferToSort+(NextSwapLocation*ElementSize), Buffer, ElementSize);
-
- //
- // Now recurse on 2 paritial lists. neither of these will have the 'pivot' element
- // IE list is sorted left half, pivot element, sorted right half...
- //
- if (NextSwapLocation >= 2) {
- QuickSortWorker(
- BufferToSort,
- NextSwapLocation,
- ElementSize,
- CompareFunction,
- Buffer);
- }
-
- if ((Count - NextSwapLocation - 1) >= 2) {
- QuickSortWorker(
- (UINT8 *)BufferToSort + (NextSwapLocation+1) * ElementSize,
- Count - NextSwapLocation - 1,
- ElementSize,
- CompareFunction,
- Buffer);
- }
-
- return;
-}
-/**
Function to perform a Quick Sort alogrithm on a buffer of comparable elements.
Each element must be equal sized.
@@ -173,12 +64,13 @@ PerformQuickSort ( Buffer = AllocateZeroPool(ElementSize);
ASSERT(Buffer != NULL);
- QuickSortWorker(
+ QuickSort (
BufferToSort,
Count,
ElementSize,
CompareFunction,
- Buffer);
+ Buffer
+ );
FreePool(Buffer);
return;
|