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/*****************************************************************************
* *
* PrimeSense PSCommon Library *
* Copyright (C) 2012 PrimeSense Ltd. *
* *
* This file is part of PSCommon. *
* *
* Licensed under the Apache License, Version 2.0 (the "License"); *
* you may not use this file except in compliance with the License. *
* You may obtain a copy of the License at *
* *
* http://www.apache.org/licenses/LICENSE-2.0 *
* *
* Unless required by applicable law or agreed to in writing, software *
* distributed under the License is distributed on an "AS IS" BASIS, *
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
* See the License for the specific language governing permissions and *
* limitations under the License. *
* *
*****************************************************************************/
//---------------------------------------------------------------------------
// Includes
//---------------------------------------------------------------------------
#include <XnOS.h>
#include <XnLog.h>
#include "XnWin32Internal.h"
//---------------------------------------------------------------------------
// Types
//---------------------------------------------------------------------------
struct XnOSSharedMemory
{
HANDLE hMapFile;
void* pAddress;
};
//---------------------------------------------------------------------------
// Code
//---------------------------------------------------------------------------
static XnStatus AccessFlagsToWin32MapFlags(XnUInt32 nAccessFlags, DWORD* pFlags)
{
DWORD result = 0;
if ((nAccessFlags & XN_OS_FILE_READ) == 0)
{
return (XN_STATUS_INVALID_OPERATION);
}
if ((nAccessFlags & XN_OS_FILE_WRITE) != 0)
{
result = PAGE_READWRITE;
}
else
{
result = PAGE_READONLY;
}
*pFlags = result;
return (XN_STATUS_OK);
}
static XnStatus AccessFlagsToWin32ViewFlags(XnUInt32 nAccessFlags, DWORD* pFlags)
{
DWORD result = 0;
if ((nAccessFlags & XN_OS_FILE_READ) == 0)
{
return (XN_STATUS_INVALID_OPERATION);
}
if ((nAccessFlags & XN_OS_FILE_WRITE) != 0)
{
result = FILE_MAP_WRITE;
}
else
{
result = FILE_MAP_READ;
}
*pFlags = result;
return (XN_STATUS_OK);
}
XN_C_API XnStatus XN_C_DECL xnOSCreateSharedMemory(const XnChar* strName, XnUInt32 nSize, XnUInt32 nAccessFlags, XN_SHARED_MEMORY_HANDLE* phSharedMem)
{
return xnOSCreateSharedMemoryEx(strName, nSize, nAccessFlags, FALSE, phSharedMem);
}
XN_C_API XnStatus XN_C_DECL xnOSCreateSharedMemoryEx(const XnChar* strName, XnUInt32 nSize, XnUInt32 nAccessFlags, XnBool bAllowOtherUsers, XN_SHARED_MEMORY_HANDLE* phSharedMem)
{
XnStatus nRetVal = XN_STATUS_OK;
XN_VALIDATE_INPUT_PTR(strName);
XN_VALIDATE_OUTPUT_PTR(phSharedMem);
DWORD mapflags;
nRetVal = AccessFlagsToWin32MapFlags(nAccessFlags, &mapflags);
XN_IS_STATUS_OK(nRetVal);
DWORD viewflags;
nRetVal = AccessFlagsToWin32ViewFlags(nAccessFlags, &viewflags);
XN_IS_STATUS_OK(nRetVal);
XnChar strWinName[XN_FILE_MAX_PATH];
nRetVal = xnWin32CreateKernelObjectName(strWinName, MAX_PATH, strName, bAllowOtherUsers);
if (nRetVal != XN_STATUS_OK)
{
return XN_STATUS_OS_EVENT_CREATION_FAILED;
}
SECURITY_ATTRIBUTES* pSecurityAttributes = NULL;
nRetVal = xnWin32GetSecurityAttributes(bAllowOtherUsers, &pSecurityAttributes);
if (nRetVal != XN_STATUS_OK)
{
return XN_STATUS_OS_EVENT_CREATION_FAILED;
}
// allocate handle
XnOSSharedMemory* pHandle;
XN_VALIDATE_CALLOC(pHandle, XnOSSharedMemory, 1);
// create file mapping
pHandle->hMapFile = CreateFileMapping(
INVALID_HANDLE_VALUE, // use paging file
pSecurityAttributes, // security
mapflags, // read/write access
0, // max. object size
nSize, // buffer size
strWinName); // name of mapping object
if (pHandle->hMapFile == NULL)
{
XN_LOG_ERROR_RETURN(XN_STATUS_OS_FAILED_TO_CREATE_SHARED_MEMORY, XN_MASK_OS, "Could not create file mapping object (%d).", GetLastError());
}
// map it to the process
pHandle->pAddress = MapViewOfFile(
pHandle->hMapFile, // handle to map object
viewflags, // read/write permission
0,
0,
nSize);
if (pHandle->pAddress == NULL)
{
XN_LOG_ERROR_RETURN(XN_STATUS_OS_FAILED_TO_CREATE_SHARED_MEMORY, XN_MASK_OS, "Could not map view of file (%d).", GetLastError());
}
*phSharedMem = pHandle;
return (XN_STATUS_OK);
}
XN_C_API XnStatus xnOSOpenSharedMemory(const XnChar* strName, XnUInt32 nAccessFlags, XN_SHARED_MEMORY_HANDLE* phSharedMem)
{
return xnOSOpenSharedMemoryEx(strName, nAccessFlags, FALSE, phSharedMem);
}
XN_C_API XnStatus XN_C_DECL xnOSOpenSharedMemoryEx(const XnChar* strName, XnUInt32 nAccessFlags, XnBool bAllowOtherUsers, XN_SHARED_MEMORY_HANDLE* phSharedMem)
{
XnStatus nRetVal = XN_STATUS_OK;
XN_VALIDATE_INPUT_PTR(strName);
XN_VALIDATE_OUTPUT_PTR(phSharedMem);
DWORD flags;
nRetVal = AccessFlagsToWin32ViewFlags(nAccessFlags, &flags);
XN_IS_STATUS_OK(nRetVal);
XnChar strWinName[XN_FILE_MAX_PATH];
nRetVal = xnWin32CreateKernelObjectName(strWinName, MAX_PATH, strName, bAllowOtherUsers);
if (nRetVal != XN_STATUS_OK)
{
return XN_STATUS_OS_FAILED_TO_OPEN_SHARED_MEMORY;
}
// allocate handle
XnOSSharedMemory* pHandle;
XN_VALIDATE_CALLOC(pHandle, XnOSSharedMemory, 1);
// create file mapping
pHandle->hMapFile = OpenFileMapping(
flags, // read/write access
FALSE, // do not inherit the name
strWinName); // name of mapping object
if (pHandle->hMapFile == NULL)
{
XN_LOG_ERROR_RETURN(XN_STATUS_OS_FAILED_TO_OPEN_SHARED_MEMORY, XN_MASK_OS, "Could not open file mapping object (%d).", GetLastError());
}
// map it to the process
pHandle->pAddress = MapViewOfFile(
pHandle->hMapFile, // handle to map object
flags, // read/write permission
0,
0,
0);
if (pHandle->pAddress == NULL)
{
XN_LOG_ERROR_RETURN(XN_STATUS_OS_FAILED_TO_OPEN_SHARED_MEMORY, XN_MASK_OS, "Could not map view of file (%d).", GetLastError());
}
*phSharedMem = pHandle;
return (XN_STATUS_OK);
}
XN_C_API XnStatus xnOSCloseSharedMemory(XN_SHARED_MEMORY_HANDLE hSharedMem)
{
XN_VALIDATE_INPUT_PTR(hSharedMem);
if (!UnmapViewOfFile(hSharedMem->pAddress))
{
XN_LOG_ERROR_RETURN(XN_STATUS_OS_FAILED_TO_CLOSE_SHARED_MEMORY, XN_MASK_OS, "Could not unmap view of file (%d).", GetLastError());
}
if (!CloseHandle(hSharedMem->hMapFile))
{
XN_LOG_ERROR_RETURN(XN_STATUS_OS_FAILED_TO_CLOSE_SHARED_MEMORY, XN_MASK_OS, "Could not close shared memory handle (%d).", GetLastError());
}
xnOSFree(hSharedMem);
return (XN_STATUS_OK);
}
XN_C_API XnStatus xnOSSharedMemoryGetAddress(XN_SHARED_MEMORY_HANDLE hSharedMem, void** ppAddress)
{
XN_VALIDATE_INPUT_PTR(hSharedMem);
XN_VALIDATE_OUTPUT_PTR(ppAddress);
*ppAddress = hSharedMem->pAddress;
return (XN_STATUS_OK);
}
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