102 lines
2.1 KiB
C
102 lines
2.1 KiB
C
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/****************************** Module Header ******************************\
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* Module Name: winutil.c
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*
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* Copyright (c) 1991, Microsoft Corporation
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*
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* Implements windows specific utility functions
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*
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* History:
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* 12-09-91 Davidc Created.
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\***************************************************************************/
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#include "sec.h"
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#include <string.h>
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#include <stdio.h>
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/****************************************************************************
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FUNCTION: Alloc
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PURPOSE: Allocates memory to hold the specified number of bytes
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RETURNS : Pointer to allocated memory or NULL on failure
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****************************************************************************/
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PVOID Alloc(
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ULONG Bytes)
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{
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HANDLE hMem;
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PVOID Buffer;
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hMem = LocalAlloc(LMEM_MOVEABLE, Bytes + sizeof(hMem));
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if (hMem == NULL) {
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return(NULL);
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}
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// Lock down the memory
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//
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Buffer = LocalLock(hMem);
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if (Buffer == NULL) {
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LocalFree(hMem);
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return(NULL);
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}
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//
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// Store the handle at the start of the memory block and return
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// a pointer to just beyond it.
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//
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*((PHANDLE)Buffer) = hMem;
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return (PVOID)(((PHANDLE)Buffer)+1);
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}
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/****************************************************************************
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FUNCTION: GetAllocSize
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PURPOSE: Returns the allocated size of the specified memory block.
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The block must have been previously allocated using Alloc
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RETURNS : Size of memory block in bytes or 0 on error
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****************************************************************************/
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ULONG GetAllocSize(
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PVOID Buffer)
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{
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HANDLE hMem;
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hMem = *(((PHANDLE)Buffer) - 1);
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return(LocalSize(hMem) - sizeof(hMem));
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}
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/****************************************************************************
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FUNCTION: Free
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PURPOSE: Frees the memory previously allocated with Alloc
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RETURNS : TRUE on success, otherwise FALSE
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****************************************************************************/
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BOOL Free(
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PVOID Buffer)
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{
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HANDLE hMem;
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hMem = *(((PHANDLE)Buffer) - 1);
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LocalUnlock(hMem);
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return(LocalFree(hMem) == NULL);
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}
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