Chapter 3. Usage
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# Chapter 3. Usage

This chapter provides examples of how to use the library.

## Initializing

The init function init_rs returns a pointer to an rs decoder structure, which holds the necessary information for encoding, decoding and error correction with the given polynomial. It either uses an existing matching decoder or creates a new one. On creation all the lookup tables for fast en/decoding are created. The function may take a while, so make sure not to call it in critical code paths.

    /* the Reed Solomon control structure */
    static struct rs_control *rs_decoder;

    /* Symbolsize is 10 (bits)
     * Primitive polynomial is x^10+x^3+1
     * first consecutive root is 0
     * primitive element to generate roots = 1
     * generator polynomial degree (number of roots) = 6
     */
    rs_decoder = init_rs (10, 0x409, 0, 1, 6);

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