git.zerfleddert.de Git - proxmark3-svn/blob - armsrc/tlv.h

   1 #ifndef __TLV_H
   2 #define __TLV_H
   3
   4 #include <stdint.h>
   5 #include <string.h>
   6 #include <stdint.h>
   7
   8 //structure buffer definitions
   9 #define TAG_LENGTH 2
  10 #define VALUE_LENGTH 1024
  11
  12 //masks
  13 //if TLV_TAG_NUMBER_MASK bits are set, refer to the next byte for the tag number
  14 //otherwise its located in bits 1-5
  15 #define TLV_TAG_NUMBER_MASK 0x1f
  16 //if TLV_DATA_MASK set then its a 'constructed data object'
  17 //otherwise a 'primitive data object'
  18 #define TLV_DATA_MASK 0x20
  19 #define TLV_TAG_MASK 0x80
  20 #define TLV_LENGTH_MASK 0x80
  21
  22 //tlv tag structure, tag can be max of 2 bytes, length up to 65535 and value 1024 bytes long
  23 typedef struct {
  24     uint8_t tag[TAG_LENGTH];
  25     uint16_t fieldlength;
  26     uint16_t valuelength;
  27     uint8_t value[VALUE_LENGTH];
  28 }tlvtag;
  29
  30 //decode a BER TLV
  31 extern int decode_ber_tlv_item(uint8_t* data, tlvtag* returnedtag);
  32 extern int encode_ber_tlv_item(uint8_t* tag, uint8_t taglen, uint8_t*data, uint32_t datalen, uint8_t* outputtag, uint32_t* outputtaglen);
  33 #endif //__TLV_H