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fixed pointer math to be portable

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svn path=/trunk/; revision=5317
This commit is contained in:
Royce Mitchell III 2003-07-29 18:51:11 +00:00
parent c709aacf75
commit a1edd5239a
1 changed files with 22 additions and 7 deletions
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29
reactos/ntoskrnl/mm/ppool.c
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@ -1,4 +1,4 @@
/* $Id: ppool.c,v 1.13 2003/07/11 01:23:15 royce Exp $ /* $Id: ppool.c,v 1.14 2003/07/29 18:51:11 royce Exp $
* *
* COPYRIGHT: See COPYING in the top level directory * COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel * PROJECT: ReactOS kernel
@ -37,6 +37,22 @@ static PMM_PPOOL_FREE_BLOCK_HEADER MmPagedPoolFirstFreeBlock;
/* FUNCTIONS *****************************************************************/ /* FUNCTIONS *****************************************************************/
inline static void* block_to_address (
MM_PPOOL_USED_BLOCK_HEADER* blk )
/*
* FUNCTION: Translate a block header address to the corresponding block
* address (internal)
*/
{
return ( (void *) ((char*)blk + sizeof(MM_PPOOL_USED_BLOCK_HEADER)) );
}
inline static MM_PPOOL_USED_BLOCK_HEADER* address_to_block(void* addr)
{
return (MM_PPOOL_USED_BLOCK_HEADER *)
( ((char*)addr) - sizeof(MM_PPOOL_USED_BLOCK_HEADER) );
}
VOID MmInitializePagedPool(VOID) VOID MmInitializePagedPool(VOID)
{ {
MmPagedPoolFirstFreeBlock = (PMM_PPOOL_FREE_BLOCK_HEADER)MmPagedPoolBase; MmPagedPoolFirstFreeBlock = (PMM_PPOOL_FREE_BLOCK_HEADER)MmPagedPoolBase;
@ -134,7 +150,7 @@ ExAllocatePagedPoolWithTag (IN POOL_TYPE PoolType,
/* /*
* Create the new free block. * Create the new free block.
*/ */
NextBlock = (PMM_PPOOL_FREE_BLOCK_HEADER)((PVOID)BestBlock + BlockSize); NextBlock = (PMM_PPOOL_FREE_BLOCK_HEADER)((char*)BestBlock + BlockSize);
NextBlock->Size = NewSize; NextBlock->Size = NewSize;
NextBlock->NextFree = BestBlock->NextFree; NextBlock->NextFree = BestBlock->NextFree;
@ -181,7 +197,7 @@ ExAllocatePagedPoolWithTag (IN POOL_TYPE PoolType,
ExReleaseFastMutex(&MmPagedPoolLock); ExReleaseFastMutex(&MmPagedPoolLock);
BlockAddress = (PVOID)NewBlock + sizeof(MM_PPOOL_USED_BLOCK_HEADER); BlockAddress = block_to_address ( NewBlock );
memset(BlockAddress, 0, NumberOfBytes); memset(BlockAddress, 0, NumberOfBytes);
@ -192,8 +208,7 @@ VOID STDCALL
ExFreePagedPool(IN PVOID Block) ExFreePagedPool(IN PVOID Block)
{ {
PMM_PPOOL_FREE_BLOCK_HEADER PreviousBlock; PMM_PPOOL_FREE_BLOCK_HEADER PreviousBlock;
PMM_PPOOL_USED_BLOCK_HEADER UsedBlock = PMM_PPOOL_USED_BLOCK_HEADER UsedBlock = address_to_block(Block);
(PMM_PPOOL_USED_BLOCK_HEADER)(Block - sizeof(MM_PPOOL_USED_BLOCK_HEADER));
ULONG UsedSize = UsedBlock->Size; ULONG UsedSize = UsedBlock->Size;
PMM_PPOOL_FREE_BLOCK_HEADER FreeBlock = PMM_PPOOL_FREE_BLOCK_HEADER FreeBlock =
(PMM_PPOOL_FREE_BLOCK_HEADER)UsedBlock; (PMM_PPOOL_FREE_BLOCK_HEADER)UsedBlock;
@ -237,7 +252,7 @@ ExFreePagedPool(IN PVOID Block)
* merge them. * merge them.
*/ */
if (NextBlock != NULL && if (NextBlock != NULL &&
((PVOID)FreeBlock + FreeBlock->Size) == (PVOID)NextBlock) ((char*)FreeBlock + FreeBlock->Size) == (char*)NextBlock)
{ {
FreeBlock->Size = FreeBlock->Size + NextBlock->Size; FreeBlock->Size = FreeBlock->Size + NextBlock->Size;
FreeBlock->NextFree = NextBlock->NextFree; FreeBlock->NextFree = NextBlock->NextFree;
@ -253,7 +268,7 @@ ExFreePagedPool(IN PVOID Block)
* merge them. * merge them.
*/ */
if (PreviousBlock != NULL && if (PreviousBlock != NULL &&
((PVOID)PreviousBlock + PreviousBlock->Size) == (PVOID)FreeBlock) ((char*)PreviousBlock + PreviousBlock->Size) == (char*)FreeBlock)
{ {
PreviousBlock->Size = PreviousBlock->Size + FreeBlock->Size; PreviousBlock->Size = PreviousBlock->Size + FreeBlock->Size;
PreviousBlock->NextFree = NextNextBlock; PreviousBlock->NextFree = NextNextBlock;