There other day I needed to encrypt certain properties in our XML configuration files. But there were few challanges that needed to be addressed Use existing Java installation !!! How will Master Encryption Key be derives and stored !!! First restriction is very important as it limits us to what algorithmic and key sizes can …
Encrypting application configuration files – Java AES Read More »
Using popcnt instruction found on newer processors to get population count which is number of set bits. Reference : SSE4 Here are couple example inputs with expected output. 0xA = 1010 — > 2 0x3F2 = 1111110010 — > 7 #include <iostream> #include <stdio.h> using namespace std; int main() { // 0xA = …
Population Count using popcnt instruction (counting number of on bits) Read More »
Common use is to crop to certain area of an image, this can be quite easily accomplished with following code. BOX* box = boxCreate(x, y, w, h); PIX* dpix= pixClipRectangle(spix, box, NULL);BOX* box = boxCreate(x, y, w, h); PIX* dpix= pixClipRectangle(spix, box, NULL);
This is program demonstrates how to use ‘cpuid’ assembly instruction on x86 to retrieve cache line size. This is done in c++ and it uses the inline assembly to execute the instructions, compiled with gcc on win32. Really we are only interested in Cache line information which can be found using 0x80000006 code and its …
Using ‘cpuid’ instructions to get cache line size Read More »
Leptonica Development with Eclipse This is the first one of few tutorials that I am writring on using Leptonica image processing library Before we start let’s give credit where the credit is due, and this is goes out to Jay W.(need link) on which this instructions are largely based on. Environment Eclipse MinGW Leptonica I …
