add: 'wiegand commands' - wiegand manipulation like encoding / decoding of credentials. From offical repo (@grauerfuchs)

Adapted and converted to fit this repo.

client/wiegand_formats.h

@@ -0,0 +1,48 @@
+//-----------------------------------------------------------------------------
+// Copyright (C) 2018 grauerfuchs
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// Wiegand format packing/unpacking routines
+//-----------------------------------------------------------------------------
+
+#ifndef WIEGAND_FORMATS_H__
+#define WIEGAND_FORMATS_H__
+
+#include <strings.h>    // memset
+#include <stdbool.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <math.h>
+#include <stdio.h>
+#include "cmddata.h"
+#include "wiegand_formatutils.h"
+#include "parity.h" // for parity
+#include "ui.h"
+
+typedef struct {
+  bool hasCardNumber;
+  bool hasFacilityCode;
+  bool hasIssueLevel;
+  bool hasOEMCode;
+  bool hasParity;
+} cardformatdescriptor_t;
+
+// Structure for defined Wiegand card formats available for packing/unpacking
+typedef struct {
+  const char* Name;
+  bool (*Pack)(wiegand_card_t* card, wiegand_message_t* packed);
+  bool (*Unpack)(wiegand_message_t* packed, wiegand_card_t* card);
+  const char* Descrp;
+  cardformatdescriptor_t Fields;
+} cardformat_t;
+
+void HIDListFormats();
+int HIDFindCardFormat(const char *format);
+cardformat_t HIDGetCardFormat(int idx);
+bool HIDPack(int FormatIndex, wiegand_card_t* card, wiegand_message_t* packed);
+bool HIDTryUnpack(wiegand_message_t* packed, bool ignoreParity);
+
+#endif