TLV.h

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#ifndef KIMODEM_TLV_H
#define KIMODEM_TLV_H
 
#include <array>
#include <cstdint>
 
#include "Arena.h"
 
 
namespace scsl {
 
namespace TLV {
 
 
#ifndef TLV_MAX_LEN
static constexpr size_t TLV_MAX_LEN = 253;
#endif
 
static constexpr uint8_t TAG_EMPTY = 0;
 
 
struct Record {
    uint8_t Tag;
    uint8_t Len;
    uint8_t Val[TLV_MAX_LEN];
};
 
uint8_t *WriteToMemory(Arena &arena, uint8_t *cursor, Record &rec);
 
void ReadFromMemory(Record &rec, uint8_t *cursor);
 
void SetRecord(Record &rec, uint8_t tag, uint8_t length, const char *data);
 
void DeleteRecord(Arena &arena, uint8_t *cursor);
 
/*
* returns a pointer to memory where the record was found,
* e.g. LocateTag(...)[0] is the tag of the found record.
* FindTag will call LocateTag and then SkipRecord if the
* tag was found.
*/
uint8_t *FindTag(Arena &arena, uint8_t *cursor, Record &rec);
 
uint8_t *LocateTag(Arena &arena, uint8_t *cursor, Record &rec);
 
uint8_t *FindEmpty(Arena &arena, uint8_t *cursor);
 
uint8_t *SkipRecord(Record &rec, uint8_t *cursor);
 
 
} // namespace TLV
} // namespace scsl
 
 
#endif