Band pass filter

Hi All, I need standalone C source code to perform a high pass and low pass and band pass filter for pcm or wave files. as in #define PCM_FILE2 "d:\\project\\data\\pcm\\es_00.pcm" The specifications are from amplitude of 0dB, Length of 64. The cutoff for low pass is 350kHz. for high pass the minimum pass through frequency is 300Hz. For bandpass, it is between 300Hz to 3500Hz. I need to be guided through the whole process of setting up the program. (The project used to be done by Nicov completed as a standalone C file with two void functions). This project is urgent and to be done as soon as possible. See attached file in picture and to display it in C's implemented graph. 3 graphs in file for low,band, high pass filter. Can look here. It's been done before. [login to view URL] And done within 12 hours. Please specify what formula and specification you want to use.