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33 lines
991 B
C
33 lines
991 B
C
#ifndef __TLV_H
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#define __TLV_H
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#include <stdint.h>
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#include <string.h>
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#include <stddef.h>
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//structure buffer definitions
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#define TAG_LENGTH 2
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#define VALUE_LENGTH 1024
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//masks
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//if TLV_TAG_NUMBER_MASK bits are set, refer to the next byte for the tag number
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//otherwise its located in bits 1-5
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#define TLV_TAG_NUMBER_MASK 0x1f
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//if TLV_DATA_MASK set then its a 'constructed data object'
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//otherwise a 'primitive data object'
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#define TLV_DATA_MASK 0x20
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#define TLV_TAG_MASK 0x80
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#define TLV_LENGTH_MASK 0x80
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//tlv tag structure, tag can be max of 2 bytes, length up to 65535 and value 1024 bytes long
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typedef struct {
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uint8_t tag[TAG_LENGTH];
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uint16_t fieldlength;
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uint16_t valuelength;
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uint8_t value[VALUE_LENGTH];
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}tlvtag;
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//decode a BER TLV
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extern int decode_ber_tlv_item(uint8_t* data, tlvtag* returnedtag);
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extern int encode_ber_tlv_item(uint8_t* tag, uint8_t taglen, uint8_t*data, uint32_t datalen, uint8_t* outputtag, uint32_t* outputtaglen);
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#endif //__TLV_H
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