windows driver 映射大文件

//如果要做到掉电后仍然可以继续向下操作,可以记录文件的位置重新映射

	NTSTATUS status;

	UNICODE_STRING strFileSrc = RTL_CONSTANT_STRING(L"\\??\\C:\\win7旗舰版.iso");//3.11G

	UNICODE_STRING strFileDest = RTL_CONSTANT_STRING(L"\\??\\C:\\win7旗舰版1.iso");

	UNICODE_STRING strSectionName = RTL_CONSTANT_STRING(L"\\MySection");//可以是符号连接的方法,也可以用\\MySection,如果不加\\会报错

	HANDLE hFileSrc = NULL;

	HANDLE hFileDest = NULL;

	OBJECT_ATTRIBUTES oaSrc;

	OBJECT_ATTRIBUTES oaDest;

	OBJECT_ATTRIBUTES oaSection;

	IO_STATUS_BLOCK iosb;

	FILE_NETWORK_OPEN_INFORMATION fnoi;

	HANDLE hSection = NULL;

	PVOID pAddress = NULL;

	SIZE_T viewsize = 0;

	LARGE_INTEGER li_Section;

	LARGE_INTEGER li_Offset;

	LARGE_INTEGER li_WriteOffset;

	SIZE_T CommitSize = 64 * 1024 * 1024;//粒度为64Kb的倍数,参考windows核心编程.每次映射的基数

<span style="white-space:pre">						</span>//GetSysteminfo中的dwAllocationGranularity 就是分配粒度，通常是64kb

	InitializeObjectAttributes(&oaSrc, &strFileSrc, OBJ_KERNEL_HANDLE, NULL, NULL);

	InitializeObjectAttributes(&oaDest, &strFileDest, OBJ_KERNEL_HANDLE, NULL, NULL);

	InitializeObjectAttributes(&oaSection, &strSectionName, OBJ_KERNEL_HANDLE, NULL, NULL);

	status = ZwCreateFile(&hFileSrc, GENERIC_READ, &oaSrc, &iosb, NULL, FILE_ATTRIBUTE_NORMAL, 0, FILE_OPEN, FILE_NON_DIRECTORY_FILE, NULL, 0);

	if (!NT_SUCCESS(status)){

		ZwClose(hFileSrc);

		KdPrint(("hFileSrc: ZwCreateFile failed with error %I32X", status));

		return status;

	}

	status = ZwQueryFullAttributesFile(&oaSrc, &fnoi);

	if (!NT_SUCCESS(status)){

		ZwClose(hFileSrc);

		ZwClose(hSection);

		KdPrint(("ZwQueryFullAttributesFile failed with error %I32X", status));

		return status;

	}

	KdPrint(("文件大小:%I64d", fnoi.AllocationSize.QuadPart));

	li_Section.QuadPart = fnoi.AllocationSize.QuadPart;

	status = ZwCreateSection(&hSection, SECTION_MAP_READ | SECTION_MAP_WRITE, &oaSection, &li_Section, PAGE_READWRITE, SEC_RESERVE, hFileSrc);//只分配在虚拟内存中,不提交到物理内存.参考VirtualAlloc

	if (!NT_SUCCESS(status)){

		ZwClose(hFileSrc);

		ZwClose(hSection);

		KdPrint(("ZwCreateSection failed with error %I32X", status));

		return status;

	}

	status = ZwCreateFile(&hFileDest,

							GENERIC_READ | GENERIC_WRITE,

							&oaDest,

							&iosb,

							&li_Section,//要创建的文件大小

							FILE_ATTRIBUTE_NORMAL,

							0,

							FILE_CREATE,

							FILE_NON_DIRECTORY_FILE,

							NULL,

							0);

	if (!NT_SUCCESS(status)){

		ZwClose(hFileSrc);

		ZwClose(hSection);

		ZwClose(hFileDest);

		KdPrint(("hFileDest: ZwCreateFile failed with error %I32X", status));

		return status;

	}

	li_Offset.QuadPart = 0;

	viewsize = CommitSize;

	while (li_Offset.QuadPart < li_Section.QuadPart){

		if ((li_Section.QuadPart - li_Offset.QuadPart) / CommitSize > 0){

			status = ZwMapViewOfSection(hSection,

										ZwCurrentProcess(),

										&pAddress,//BaseAddress 如果不为NULL,则分配在指定的位置,有可能失败

										0,//为NULL,表示可以分配在虚拟内存的任意位置,请参考windows核心编程里面的VirtualAlloc

										CommitSize,//文件大小

										&li_Offset,

										&viewsize,

										ViewUnmap,

										MEM_RESERVE | MEM_LARGE_PAGES ,

										PAGE_READWRITE);

			if (!NT_SUCCESS(status)){

				ZwClose(hFileSrc);

				ZwClose(hSection);

				ZwClose(hFileDest);

				ZwUnmapViewOfSection(hSection, pAddress);

				KdPrint(("ZwMapViewOfSection1 failed with error %I32X", status));

				return status;

			}

			li_WriteOffset.HighPart = -1;

			li_WriteOffset.LowPart = FILE_WRITE_TO_END_OF_FILE;

			ZwWriteFile(hFileDest, NULL, NULL, NULL, &iosb, pAddress, viewsize, &li_WriteOffset, NULL);//从文件末尾开始写数据

			ZwUnmapViewOfSection(ZwCurrentProcess(), pAddress);

			li_Offset.QuadPart += viewsize;

		}

		else{

			viewsize = (SIZE_T)(li_Section.QuadPart - li_Offset.QuadPart);//获得剩余多少数据还没有写入

			KdPrint(("view = %I64d %I32d %I64d", li_Offset.QuadPart, viewsize, li_Section.QuadPart));

			status = ZwMapViewOfSection(hSection,

										ZwCurrentProcess(),

										&pAddress,//BaseAddress 如果不为NULL,则分配在指定的位置,有可能失败

										0,//为NULL,表示可以分配在虚拟内存的任意位置,请参考windows核心编程里面的VirtualAlloc

										viewsize,//文件大小

										&li_Offset,

										&viewsize,

										ViewUnmap,

										MEM_RESERVE | MEM_LARGE_PAGES ,

										PAGE_READWRITE);

			if (!NT_SUCCESS(status)){

				ZwClose(hFileSrc);

				ZwClose(hSection);

				ZwClose(hFileDest);

				ZwUnmapViewOfSection(hSection, pAddress);

				KdPrint(("ZwMapViewOfSection2 failed with error %I32X", status));

				return status;

			}

			li_WriteOffset.HighPart = -1;

			li_WriteOffset.LowPart = FILE_WRITE_TO_END_OF_FILE;

			ZwWriteFile(hFileDest, NULL, NULL, NULL, &iosb, pAddress, viewsize, &li_WriteOffset, NULL);//参数ByteOffset为0表示从其实地址开始写数据,适用于小文件

			ZwUnmapViewOfSection(ZwCurrentProcess(), pAddress);

			li_Offset.QuadPart += viewsize;

		}

	}

	ZwClose(hSection);

	ZwClose(hFileDest);

	ZwClose(hFileSrc);

	KdPrint(("写文件成功"));

	return STATUS_SUCCESS;
巴特西

windows driver 映射大文件

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