CRC Calculation Example in C

This repository contains an example implementation of the CRC (Cyclic Redundancy Check) algorithm in C. It consists of two files:

• crc.c — contains a universal CRC calculation function that supports customizable width, polynomial, initial value, XOR output, and input/output reflection flags;
• main.c — demonstrates how to use the crc_compute function from crc.c using the test string "123456789".

Algorithm Parameters

Parameters for most well-known CRC algorithms — including polynomial, init, xorOut, refIn, and refOut — can be found at:

https://crccalc.com

Example parameters in this repository: CRC-32/ISO-HDLC

Expected CRC result for the string "123456789": 0xCBF43926

Compilation

gcc -o crc_test main.c
./crc_test

Limitations

• Requires a precomputed CRC table.
• Supports CRC sizes up to 32 bits.
• Does not support differing refIn and refOut flags (only cases where both are either true or false).