mirror of
https://github.com/reactos/reactos.git
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142 lines
3.1 KiB
C
142 lines
3.1 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS ReactX
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* FILE: dll/directx/d3d9/d3d9_helpers.c
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* PURPOSE: d3d9.dll helper functions
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* PROGRAMERS: Gregor Brunmar <gregor (dot) brunmar (at) home (dot) se>
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*/
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#include <d3d9.h>
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#include "d3d9_helpers.h"
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#include <stdio.h>
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#include <ddraw.h>
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#include <debug.h>
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#define MEM_ALIGNMENT 0x20
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static LPCSTR D3D9_DebugRegPath = "Software\\Microsoft\\Direct3D";
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BOOL ReadRegistryValue(IN DWORD ValueType, IN LPCSTR ValueName, OUT LPBYTE DataBuffer, IN OUT LPDWORD DataBufferSize)
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{
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HKEY hKey;
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DWORD Type;
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LONG Ret;
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if (ERROR_SUCCESS != RegOpenKeyExA(HKEY_LOCAL_MACHINE, D3D9_DebugRegPath, 0, KEY_QUERY_VALUE, &hKey))
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return FALSE;
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Ret = RegQueryValueExA(hKey, ValueName, 0, &Type, DataBuffer, DataBufferSize);
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RegCloseKey(hKey);
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if (ERROR_SUCCESS != Ret)
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return FALSE;
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if (Type != ValueType)
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return FALSE;
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return TRUE;
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}
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HRESULT SafeFormatString(OUT LPSTR Buffer, IN DWORD BufferSize, IN LPCSTR FormatString, ... )
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{
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DWORD BytesWritten;
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va_list vargs;
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if (BufferSize == 0)
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return DDERR_INVALIDPARAMS;
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va_start(vargs, FormatString);
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BytesWritten = _vsnprintf(Buffer, BufferSize-1, FormatString, vargs);
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va_end(vargs);
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if (BytesWritten < BufferSize)
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return DDERR_GENERIC;
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Buffer[BufferSize-1] = '\0';
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return ERROR_SUCCESS;
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}
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HRESULT SafeCopyString(OUT LPSTR Dst, IN DWORD DstSize, IN LPCSTR Src)
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{
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HRESULT hr = ERROR_SUCCESS;
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if (Dst == NULL || DstSize == 0 || Src == NULL)
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return DDERR_INVALIDPARAMS;
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while (*Src != '\0' && DstSize > 0)
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{
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*Dst++ = *Src++;
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--DstSize;
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}
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if (DstSize == 0)
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{
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--Dst;
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hr = DDERR_GENERIC;
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}
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return hr;
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}
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HRESULT SafeAppendString(IN OUT LPSTR Dst, IN DWORD DstSize, IN LPCSTR Src)
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{
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size_t CurrentDstLength;
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if (Dst == NULL || DstSize == 0)
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return DDERR_INVALIDPARAMS;
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CurrentDstLength = strlen(Dst);
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return SafeCopyString(Dst + CurrentDstLength, DstSize - CurrentDstLength, Src);
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}
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HRESULT AlignedAlloc(IN OUT LPVOID *ppObject, IN SIZE_T dwSize)
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{
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ULONG_PTR AddressOffset;
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ULONG AlignedMask = MEM_ALIGNMENT - 1;
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CHAR *AlignedPtr;
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ULONG_PTR *AlignedOffsetPtr;
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if (ppObject == 0)
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return DDERR_INVALIDPARAMS;
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if (dwSize == 0)
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{
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*ppObject = NULL;
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return S_OK;
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}
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dwSize += MEM_ALIGNMENT;
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AlignedPtr = (CHAR *)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, dwSize);
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if (AlignedPtr == 0)
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return DDERR_OUTOFMEMORY;
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AddressOffset = MEM_ALIGNMENT - ((ULONG_PTR)AlignedPtr & AlignedMask);
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AlignedPtr += AddressOffset;
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AlignedOffsetPtr = (ULONG_PTR *)(AlignedPtr - sizeof(ULONG));
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*AlignedOffsetPtr = AddressOffset;
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*ppObject = (ULONG_PTR *)AlignedPtr;
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return S_OK;
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}
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VOID AlignedFree(IN OUT LPVOID pObject)
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{
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CHAR *NonAlignedPtr = pObject;
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ULONG_PTR *AlignedPtr = pObject;
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if (pObject == 0)
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return;
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NonAlignedPtr -= *(AlignedPtr - 1);
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HeapFree(GetProcessHeap(), 0, NonAlignedPtr);
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}
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