client/src/wiegand_formatutils.h

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2018 grauerfuchs
   3 //
   4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   5 // at your option, any later version. See the LICENSE.txt file for the text of
   6 // the license.
   7 //-----------------------------------------------------------------------------
   8 // Weigand card format packing/unpacking support functions
   9 //-----------------------------------------------------------------------------
  10
  11 #ifndef WIEGAND_FORMATUTILS_H__
  12 #define WIEGAND_FORMATUTILS_H__
  13
  14 #include <stdarg.h>
  15 #include <stdint.h>
  16 #include <stdbool.h>
  17
  18 // Structure for packed wiegand messages
  19 // Always align lowest value (last transmitted) bit to ordinal position 0 (lowest valued bit bottom)
  20 typedef struct {
  21     uint8_t Length;   // Number of encoded bits in wiegand message (excluding headers and preamble)
  22     uint32_t Top;     // Bits in x<<64 positions
  23     uint32_t Mid;     // Bits in x<<32 positions
  24     uint32_t Bot;     // Lowest ordinal positions
  25 } wiegand_message_t;
  26
  27 // Structure for unpacked wiegand card, like HID prox
  28 typedef struct {
  29     uint32_t FacilityCode;
  30     uint64_t CardNumber;
  31     uint32_t IssueLevel;
  32     uint32_t OEM;
  33     bool ParityValid; // Only valid for responses
  34 } wiegand_card_t;
  35
  36 uint8_t get_bit_by_position(wiegand_message_t *data, uint8_t pos);
  37 bool set_bit_by_position(wiegand_message_t *data, bool value, uint8_t pos);
  38
  39 uint64_t get_linear_field(wiegand_message_t *data, uint8_t firstBit, uint8_t length);
  40 bool set_linear_field(wiegand_message_t *data, uint64_t value, uint8_t firstBit, uint8_t length);
  41
  42 uint64_t get_nonlinear_field(wiegand_message_t *data, uint8_t numBits, uint8_t *bits);
  43 bool set_nonlinear_field(wiegand_message_t *data, uint64_t value, uint8_t numBits, uint8_t *bits);
  44
  45 wiegand_message_t initialize_message_object(uint32_t top, uint32_t mid, uint32_t bot, int n);
  46
  47 bool add_HID_header(wiegand_message_t *data);
  48
  49 #endif