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Adding and Removing Routes in the Linux Routing Table

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Adding and Removing Routes in the Linux Routing Table. Adding and Removing Routes in the Linux Routing Table. December 8, 2014. Middot; by rafael. Middot; in Programming. We will go through how to add and remove null routes in c , though there is a lot more you can do with Linux’ routing tables. For this project I want to use the routing tables like a firewall. I have a home built web server (you’re using it now! In an earlier article I showed how to ban these using TCP REPAIR. Should it be forwarded?

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Math Archives - Programmer's Notebook

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Exponential Moving Averages for Irregular Time Series. June 3, 2013. Middot; by rafael. Middot; in Math. In time series analysis there is often a need for smoothing functions that react quickly to changes in the signal. In the typical application, you may be processing an input signal in real time, and want to compute such things…. Fast Generation of Non-Uniform Random Numbers. April 3, 2013. Middot; by rafael. Middot; in Math. Compressing Unit Vectors into 16-bits. March 27, 2013. Middot; by rafael.

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Get USB Drive Serial Number on Windows in C++

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Get USB Drive Serial Number on Windows in C. Get USB Drive Serial Number on Windows in C. June 1, 2012. Middot; by rafael. Middot; in Programming. Getting the serial number of a USB device in Windows is a lot harder than it should be. ( But it’s a lot easier than getting the USB serial number on Os X. First here is the code:. 0 ) & ( dwSize = sizeof( Buf ) ) { pspdidd- cbSize = sizeof( *pspdidd ); / 5 Bytes! INVALID HANDLE VALUE ) { DWORD usbDeviceNumber = getDeviceNumber( hDrive ); if ( usbDeviceNumber ...

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Generating a Cross-Platform Unique Machine Fingerprint

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Generating a Cross-Platform Unique Machine Fingerprint. Generating a Cross-Platform Unique Machine Fingerprint. May 31, 2013. Middot; by rafael. Middot; in Programming. But how to identify the machine? Many pieces of hardware have a hardware serial number. This includes the CPU, each of the hard disks, and all the network interfaces, which each have a globally unique MAC address. The software id’s are in the user’s control and can be duplicated. In other words the user could clone the mac...We will want ...

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Identifying Image Format from the First Few "Magic" Bytes in C++

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Identifying Image Format from the First Few “Magic” Bytes in C. Identifying Image Format from the First Few “Magic” Bytes in C. January 7, 2015. Middot; by rafael. Middot; in Programming. A function to identify the most common format is easy to write. First lets define an enumeration for all the file types we will support:. And now the image type detection function:. WEBP / .ico 00 00 01 00 / 00 00 02 00 ( cursor files ) switch ( data[0] ) { case (u8)' xFF': return (! IMAGE FILE TIFF : IMAGE FILE INVALID...

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Fast Generation of Non-Uniform Random Numbers

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Fast Generation of Non-Uniform Random Numbers. Fast Generation of Non-Uniform Random Numbers. April 3, 2013. Middot; by rafael. Middot; in Math. Suppose you want to chose between several values randomly with uniform probability. That is, you might have 5 options, A, B, C, D, E. You want to chose among them with equal probability. You generate a random number from [0-1), and multiply that number by 5, round down to the nearest integer, use that to index into an array of letters. The other problem with thi...

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Exponential Moving Averages for Irregular Time Series

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Exponential Moving Averages for Irregular Time Series. Exponential Moving Averages for Irregular Time Series. June 3, 2013. Middot; by rafael. Middot; in Math. The simplest smoothing function is a windowed moving average. As samples come in you take an average of the most recent N values. This will smooth out spikes, but introduces a delay – or latency. Your average will always be delayed by the width of your moving average. Another type of moving average is the “weighted moving average” that...Double we...

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Programmer's Notebook

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Compressing Unit Vectors into 16-bits. March 27, 2013. Middot; by rafael. Middot; in Math. Some years ago I posted an article about how to compress unit vectors, or normals, efficiently into 16 bits. The original article is getting harder to find, so I’m reposting a version of it here. Since the original article this…. Dealing with Network Port Abuse in Sockets in C. January 4, 2013. Middot; by rafael. Middot; in Programming. Read/Write Locks and Upgrading Lock State from Read to Write. November 28, 2012.

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Fast Approximate Distance Functions

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Fast Approximate Distance Functions. Fast Approximate Distance Functions. May 22, 2013. Middot; by rafael. Middot; in Programming. The formula for the euclidean distance between two points, in three dimensions is:. In two dimensions its:. Computing this function requires a square root, which even on modern computers is expensive. It is also possible to implement this approximation without even using multiplies if your hardware is that limited:. A Final Note on the Applicability of this Technique. This is...

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Packing Data Files into Compiled Executables

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Packing Data Files into Compiled Executables. Packing Data Files into Compiled Executables. May 31, 2013. Middot; by rafael. Middot; in Programming. Have you ever wanted to distribute a compiled binary that included data files packed into the executable file? Embedding a Data File Before Compilation. You can do this before compilation by encoding the file into a binary representation, and then compiling that data into statically allocated buffers. And use a tool to convert it to c code:. This is useful f...