COLLECT.C

/*++ 
 
Copyright 1996 - 1998 Microsoft Corporation 
 
Module Name: 
 
    collect.c 
 
Abstract: 
 
    Implements a very simple collection for mapping DWORD key values 
to a blob of data. 
 
Revision History: 
 
--*/ 
 
#include <windows.h> 
#include <stdlib.h> 
#include "collect.h" 
 
typedef struct _node_tag  { 
DWORD dwKey; 
PVOID *pData; 
struct _node_tag *pNext; 
} NODE, *PNODE; 
 
static NODE Head = {(DWORD)-1, NULL, NULL}; 
 
BOOL GetEntry (DWORD dwKey, PVOID *ppData) 
{ 
PNODE pCurrent; 
 
pCurrent = Head.pNext; 
while (NULL != pCurrent) { 
if (dwKey == pCurrent->dwKey)  { 
*ppData = pCurrent->pData; 
return(TRUE); 
} 
pCurrent = pCurrent->pNext; 
} 
 
return(FALSE); 
} 
 
BOOL AddEntry (DWORD dwKey, PVOID pData) 
{ 
PNODE pTemp; 
 
pTemp = (PNODE) malloc (sizeof (NODE)); 
if (NULL == pTemp)  { 
return(FALSE); 
} 
 
pTemp->dwKey = dwKey; 
pTemp->pData = pData; 
pTemp->pNext = Head.pNext; 
Head.pNext = pTemp; 
 
return(TRUE); 
} 
 
BOOL DeleteEntry (DWORD dwKey, PVOID *ppData) 
{ 
PNODE pCurrent, pTemp; 
 
pTemp = &Head; 
pCurrent = Head.pNext; 
 
while (NULL != pCurrent) { 
if (dwKey == pCurrent->dwKey)  { 
pTemp->pNext = pCurrent->pNext; 
*ppData = pCurrent->pData; 
free (pCurrent); 
return(TRUE); 
} 
else { 
pTemp = pCurrent; 
pCurrent = pCurrent->pNext; 
} 
} 
 
return(FALSE); 
}