144 lines
1.8 KiB
C
144 lines
1.8 KiB
C
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/*++
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Copyright (c) 1993 Microsoft Corporation
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Module Name:
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spmemory.c
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Abstract:
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Memory allocation routines for text setup.
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Author:
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Ted Miller (tedm) 29-July-1993
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Revision History:
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--*/
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#include "efinvram.h"
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PVOID
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MemAlloc(
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IN SIZE_T Size
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)
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/*++
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Routine Description:
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This function is guaranteed to succeed.
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Arguments:
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Return Value:
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--*/
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{
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PSIZE_T p;
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//
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// Add space for storing the size of the block.
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//
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p = RtlAllocateHeap( RtlProcessHeap(), 0, Size + sizeof(SIZE_T) );
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if ( p == NULL ) {
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FatalError( ERROR_NOT_ENOUGH_MEMORY, L"Insufficient memory\n" );
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}
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//
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// Store the size of the block, and return the address
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// of the user portion of the block.
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//
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*p++ = Size;
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return p;
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}
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PVOID
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MemRealloc(
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IN PVOID Block,
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IN SIZE_T NewSize
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)
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/*++
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Routine Description:
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This function is guaranteed to succeed.
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Arguments:
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Return Value:
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--*/
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{
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PSIZE_T NewBlock;
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SIZE_T OldSize;
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//
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// Get the size of the block being reallocated.
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//
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OldSize = ((PSIZE_T)Block)[-1];
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//
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// Allocate a new block of the new size.
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//
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NewBlock = MemAlloc(NewSize);
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ASSERT(NewBlock);
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//
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// Copy the old block to the new block.
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//
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if (NewSize < OldSize) {
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RtlCopyMemory(NewBlock, Block, NewSize);
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} else {
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RtlCopyMemory(NewBlock, Block, OldSize);
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}
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//
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// Free the old block.
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//
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MemFree(Block);
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//
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// Return the address of the new block.
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//
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return(NewBlock);
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}
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VOID
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MemFree(
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IN PVOID Block
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)
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/*++
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Routine Description:
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Arguments:
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Return Value:
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--*/
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{
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if (Block == NULL)
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return;
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//
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// Free the block at its real address.
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//
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RtlFreeHeap( RtlProcessHeap(), 0, (PSIZE_T)Block - 1);
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}
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