test unpacking of PackBits()

src/packbits.h

@@ -0,0 +1,41 @@
+/* vim:expandtab:ts=2 sw=2:
+*/
+/*  Grafx2 - The Ultimate 256-color bitmap paint program
+
+    Copyright 2018-2019 Thomas Bernard
+    Copyright 2008 Yves Rizoud
+    Copyright 2007 Adrien Destugues
+    Copyright 1996-2001 Sunset Design (Guillaume Dorme & Karl Maritaud)
+
+    Grafx2 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; version 2
+    of the License.
+
+    Grafx2 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 Grafx2; if not, see <http://www.gnu.org/licenses/>
+*/
+
+///@file packbits.h
+/// Packbits compression as used in IFF etc.
+
+#ifndef PACKBITS_H_INCLUDED
+#define PACKBITS_H_INCLUDED
+
+// error codes :
+
+#define PACKBITS_UNPACK_OK 0
+#define PACKBITS_UNPACK_READ_ERROR -1
+#define PACKBITS_UNPACK_OVERFLOW_ERROR -2
+
+/**
+ * @return PACKBITS_UNPACK_OK or PACKBITS_UNPACK_READ_ERROR or PACKBITS_UNPACK_OVERFLOW_ERROR
+ */
+int PackBits_unpack_from_file(FILE * f, byte * dest, unsigned int count);
+
+#endif