[proxmark3-svn] / armsrc / tlv.h

#ifndef __TLV_H
#define __TLV_H

#include <stdint.h>
#include <string.h>
#include <stddef.h>

//structure buffer definitions
#define TAG_LENGTH 2
#define VALUE_LENGTH 1024

//masks
//if TLV_TAG_NUMBER_MASK bits are set, refer to the next byte for the tag number
//otherwise its located in bits 1-5
#define TLV_TAG_NUMBER_MASK 0x1f
//if TLV_DATA_MASK set then its a 'constructed data object'
//otherwise a 'primitive data object'
#define TLV_DATA_MASK 0x20
#define TLV_TAG_MASK 0x80
#define TLV_LENGTH_MASK 0x80

//tlv tag structure, tag can be max of 2 bytes, length up to 65535 and value 1024 bytes long 
typedef struct {
    uint8_t tag[TAG_LENGTH];
    uint16_t fieldlength;
    uint16_t valuelength; 
    uint8_t value[VALUE_LENGTH];
}tlvtag;

//decode a BER TLV 
extern int decode_ber_tlv_item(uint8_t* data, tlvtag* returnedtag);
extern int encode_ber_tlv_item(uint8_t* tag, uint8_t taglen, uint8_t*data, uint32_t datalen, uint8_t* outputtag, uint32_t* outputtaglen);
#endif //__TLV_H
Commit	Line	Data
9206d3b0	1	#ifndef __TLV_H
	2	#define __TLV_H
	3
	4	#include <stdint.h>
9206d3b0	5	#include <string.h>
e04f23fa	6	#include <stddef.h>
9206d3b0	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_tdata, uint32_t datalen, uint8_t outputtag, uint32_t* outputtaglen);
	33	#endif //__TLV_H