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+/*
+ * The copyright in this software is being made available under the 2-clauses 
+ * BSD License, included below. This software may be subject to other third 
+ * party and contributor rights, including patent rights, and no such rights
+ * are granted under this license.
+ *
+ * Copyright (c) 2001-2003, David Janssens
+ * Copyright (c) 2002-2003, Yannick Verschueren
+ * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
+ * Copyright (c) 2005, Herve Drolon, FreeImage Team
+ * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
+ * Copyright (c) 2005-2006, Dept. of Electronic and Information Engineering, Universita' degli Studi di Perugia, Italy
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifdef USE_JPWL
+
+/**
+@file rs.h
+@brief Functions used to compute Reed-Solomon parity and check of byte arrays
+
+*/
+
+#ifndef __RS_HEADER__
+#define __RS_HEADER__
+
+/** Global definitions for Reed-Solomon encoder/decoder
+ * Phil Karn KA9Q, September 1996
+ *
+ * The parameters MM and KK specify the Reed-Solomon code parameters.
+ *
+ * Set MM to be the size of each code symbol in bits. The Reed-Solomon
+ * block size will then be NN = 2**M - 1 symbols. Supported values are
+ * defined in rs.c.
+ *
+ * Set KK to be the number of data symbols in each block, which must be
+ * less than the block size. The code will then be able to correct up
+ * to NN-KK erasures or (NN-KK)/2 errors, or combinations thereof with
+ * each error counting as two erasures.
+ */
+#define MM  8		/* RS code over GF(2**MM) - change to suit */
+
+/* KK defined in rs.c */
+
+#define	NN ((1 << MM) - 1)
+
+#if (MM <= 8)
+typedef unsigned char dtype;
+#else
+typedef unsigned int dtype;
+#endif
+
+/** Initialization function */
+void init_rs(int);
+
+/** These two functions *must* be called in this order (e.g.,
+ * by init_rs()) before any encoding/decoding
+ */
+void generate_gf(void);	/* Generate Galois Field */
+void gen_poly(void);	/* Generate generator polynomial */
+
+/** Reed-Solomon encoding
+ * data[] is the input block, parity symbols are placed in bb[]
+ * bb[] may lie past the end of the data, e.g., for (255,223):
+ *	encode_rs(&data[0],&data[223]);
+ */
+int encode_rs(dtype data[], dtype bb[]);
+
+/** Reed-Solomon erasures-and-errors decoding
+ * The received block goes into data[], and a list of zero-origin
+ * erasure positions, if any, goes in eras_pos[] with a count in no_eras.
+ *
+ * The decoder corrects the symbols in place, if possible and returns
+ * the number of corrected symbols. If the codeword is illegal or
+ * uncorrectible, the data array is unchanged and -1 is returned
+ */
+int eras_dec_rs(dtype data[], int eras_pos[], int no_eras);
+
+/**
+Computes the minimum between two integers
+@param a first integer to compare
+@param b second integer to compare
+@return returns the minimum integer between a and b
+*/
+#ifndef min
+#define min(a,b)    (((a) < (b)) ? (a) : (b))
+#endif /* min */
+
+#endif /* __RS_HEADER__ */
+
+
+#endif /* USE_JPWL */