User BCH (Bose-Chaudhuri-Hocquenghem) encode/decode library based on bch module from linux kernel

License is GPL.

This is a fork of mborgerding/bch_codec, which, in turn, is a fork of the bch.c file in the linux kernel written by Ivan Djelic at Parrot. It closely follows the original with the following enhancements:

• all kernel-specific functions have been removed
• added bit level functions (rather than packed bytes) support for BCH messages, codewords, parity words
• added error correction interface functions

Differences from mborgerding/bch_codec include:

• Ability to use your own malloc/free and printf functions (uncomment BCH_USE_OWN_MALLOC and BCH_USE_OWN_PRINTF defines in bch_codec.h)
• Ability to use some instructions of Texas Instruments TMS320C64xx processors (uncomment BCH_USE_TMS320C6400_INTRINSICS define in bch_codec.h)