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");//3.11GUNICODE_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64kbInitializeObjectAttributes(&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VirtualAllocif (!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VirtualAllocCommitSize,//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VirtualAllocviewsize,//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;