| | 1 | #ifndef __TLV_H |
| | 2 | #define __TLV_H |
| | 3 | |
| | 4 | #include <stdint.h> |
| | 5 | #include <string.h> |
| | 6 | #include <stddef.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 |
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