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[DllImport("kernel32", SetLastError=true)] static extern unsafe int CreateFile(

Role-Based Access Control (RBAC)

string filename, uint desiredAccess, uint shareMode, uint attributes, uint creationDisposition, uint flagsAndAttributes, uint templateFile); [DllImport("kernel32", SetLastError=true)] static extern unsafe bool ReadFile( int hFile, void* lpBuffer, int nBytesToRead, int* nBytesRead, int overlapped);

You will create a new class, APIFileReader, whose constructor will invoke the CreateFile() method. The constructor takes a filename as a parameter, and passes that filename to the CreateFile() method:

public APIFileReader(string filename) { fileHandle = CreateFile( filename, // filename GenericRead, // desiredAccess UseDefault, // shareMode UseDefault, // attributes OpenExisting, // creationDisposition UseDefault, // flagsAndAttributes UseDefault); // templateFile }

Note Well formed XML documents always have beginning and closing tags, for example, <block></block>.

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The APIFileReader class implements only one other method, Read(), which invokes ReadFile(). It passes in the file handle created in the class constructor, along with a pointer into a buffer, a count of bytes to retrieve, and a reference to a variable that will hold the number of bytes read. It is the pointer to the buffer that is of interest to us here. To invoke this API call, you must use a pointer. Because you will access it with a pointer, the buffer needs to be pinned in memory; we ve given ReadFile a pointer to our buffer, so we can t allow the .NET Framework to move that buffer during garbage collection until ReadFile is finished. (Normally, the garbage collector is forever moving items around to make more efficient use of memory.) To accomplish this, we use the C# fixed keyword. fixed allows you to get a pointer to the memory used by the buffer, and to mark that instance so that the garbage collector won t move it.

The third access control model is the RBAC model, which is similar to the MAC model in the sense that the system decides exactly which users are allowed to access which resources but the system does this in a special way. A RBAC system will incorporate the user s role into its access decision. For instance, the system may know about the user s position (or role) within a company (e.g., administrative assistant, manager, or CEO) and give the user different privileges based on that role. For instance, the CEO may be allowed to access salary information about any employee in the company, whereas a manager may only be able to access salary information about his or her subordinates.

Pinning reduces the efficiency of the garbage collector. If an interop scenario forces you to use pointers, you should try to minimize the duration for which you need to keep anything pinned. This is another reason to avoid using pointers for anything other than places where you have no choice.

The block of statements following the fixed keyword creates a scope, within which the memory will be pinned. At the end of the fixed block, the instance will be unpinned, and the garbage collector will once again be free to move it. This is known as declarative pinning:

public unsafe int Read(byte[] buffer, int index, int count) { int bytesRead = 0; fixed (byte* bytePointer = buffer) { ReadFile( fileHandle, bytePointer + index, count, &bytesRead, 0); } return bytesRead; }

You may be wondering why we didn t also need to pin bytesRead the ReadFile method expects a pointer to that too. It was unnecessary because bytesRead lives on the stack here, not the heap, and so the garbage collector would never attempt to move it. C# knows this, so it lets us use the & operator to get the address without having to use fixed. If we had applied that operator to an int that was stored as a field in an object, it would have refused to compile, telling us that we need to use fixed.

You need to make absolutely sure that you don t unpin the memory too early. Some APIs will keep hold of pointers you give them, continuing to use them even after returning. For example, the ReadFileEx Win32 API can be used asynchronously you can ask it to return before it has fetched the data. In that case you would need to keep the buffer pinned until the operation completes, rather than merely keeping it pinned for the duration of the method call.

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