Add initial sharable DDCMP support

PDP11/pdp11_ddcmp.h

@@ -0,0 +1,45 @@
+/* pdp11_ddcmp.h: Digital Data Communications Message Protocol support
+
+   Copyright (c) 2013, Mark Pizzolato
+
+   Permission is hereby granted, free of charge, to any person obtaining a
+   copy of this software and associated documentation files (the "Software"),
+   to deal in the Software without restriction, including without limitation
+   the rights to use, copy, modify, merge, publish, distribute, sublicense,
+   and/or sell copies of the Software, and to permit persons to whom the
+   Software is furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+   ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+   IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+   Except as contained in this notice, the name of Robert M Supnik shall not be
+   used in advertising or otherwise to promote the sale, use or other dealings
+   in this Software without prior written authorization from Robert M Supnik.
+
+   Digital Data Communications Message Protocol - DDCMP support routines 
+
+   29-May-13    MP      Initial implementation
+*/
+
+#ifndef PDP11_DDCMP_H_
+#define PDP11_DDCMP_H_    0
+
+/* DDCMP packet types */
+
+#define DDCMP_SOH 0201u   /* Numbered Data Message Identifier */
+#define DDCMP_ENQ 0005u   /* Control Message Identifier */
+#define DDCMP_DLE 0220u   /* Maintenance Message Identifier */
+
+/* Support routines */
+
+void ddcmp_packet_trace (uint32 reason, DEVICE *dptr, const char *txt, const uint8 *msg, int32 len, t_bool detail);
+uint16 ddcmp_crc16(uint16 crc, const void* vbuf, size_t len);
+
+#endif /* PDP11_DDCMP_H_ */