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source/par1j/gf8.h

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+// This is a sub-set of Galois.h , and changed for 8-bit only
+
+/* Galois.h
+ * James S. Plank
+
+Galois.tar - Fast Galois Field Arithmetic Library in C/C++
+Copright (C) 2007 James S. Plank
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+James S. Plank
+Department of Computer Science
+University of Tennessee
+Knoxville, TN 37996
+plank@cs.utk.edu
+
+ */
+
+#ifndef _GF8_H_
+#define _GF8_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+extern int galois_create_log_tables(void);	/* Returns 0 on success, -1 on failure */
+extern int galois_create_mult_tables(void);
+extern int galois_multtable_multiply(int x, int y);
+extern int galois_multtable_divide(int x, int y);
+
+extern int galois_power(int x, int y);	// 乗数計算用に追加
+extern void galois_free_tables(void);	// 解放用に追加
+
+void galois_region_xor(
+	unsigned char *r1,	// Region 1
+	unsigned char *r2,	// Sum region (r2 = r1 ^ r2)
+	int nbytes);		// Number of bytes in region
+
+void galois_region_multiply(
+	unsigned char *r1,	// Region to multiply
+	unsigned char *r2,	// products go here.
+	int nbytes,			// Number of bytes in region
+	int multby);		// Number to multiply by
+
+#define HASH_SIZE 4
+#define HASH_RANGE 128
+void checksum4(unsigned char *data, unsigned char *hash, int byte_size);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif