http://elijah.mirecki.com/categories/c/ Recent content in C on Sylvia Mirecki Hugo -- gohugo.io en-us Sat, 25 Aug 2018 21:28:22 -0400 http://elijah.mirecki.com/blog/eb-compression/ Sat, 25 Aug 2018 21:28:22 -0400 http://elijah.mirecki.com/blog/eb-compression/ For a while, I’ve been interested in image compression algorithms. Specifically, lossless image compression algorithms. I thought of a really simple area-based lossless compression algorithm on Friday, so I wrote a small program to compress PPM files. The compressed format, Eli Bitmap (EB), stores rectangles of identical color as “regions” in the bitmap data. Any pixels that could not be reasonably compressed using into rectangles would be appended after the rectangle region definitions. http://elijah.mirecki.com/blog/hello-world-using-only-c-syscalls/ Mon, 29 Aug 2016 22:06:21 +0000 http://elijah.mirecki.com/blog/hello-world-using-only-c-syscalls/ I’m currently working on implementing system calls in BlarbVM (see my previous post on it), so I am trying to get comfortable using only syscalls. In Linux, you can change the heap size through brk (syscall #12). To write a string to standard output, you must provide a pointer to a location on the heap. The following code: Get’s the end of the heap address Increments the end of the heap address by 6 bytes