Implement HA's ASC and HSC algorithms.

ha/acoder.h

@@ -0,0 +1,38 @@
+/***********************************************************************
+  This file is part of HA, a general purpose file archiver.
+  Copyright (C) 1995 Harri Hirvola
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program 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 General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+************************************************************************
+    HA arithmetic coder
+***********************************************************************/
+
+/***********************************************************************
+  Modified to work with memory buffers instead of files by
+  Copyright (C) 2005 Natalia Portillo
+************************************************************************/
+
+#ifndef ACODER_H
+#define ACODER_H
+
+#include "internal.h"
+
+void ac_init_decode(decompress_context_t *ctx);
+
+void ac_in(U16B low, U16B high, U16B tot);
+
+U16B ac_threshold_val(U16B tot);
+
+#endif /* ACODER_H */