tlv.h

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#pragma once
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
 
#ifdef __cplusplus
extern "C" {
#endif

typedef enum {
    TLV_OK = 0,
    TLV_ERR_BUF_TOO_SMALL,  
    TLV_ERR_BAD_LENGTH,     
    TLV_ERR_BAD_TAG,        
    TLV_ERR_NULL,           
} tlv_status_t;

size_t tlv_tag_size(uint16_t tag);

size_t tlv_len_size(size_t value_len);

tlv_status_t tlv_write_tag(uint8_t *buf, size_t buf_max, uint16_t tag,
                           size_t *written);

tlv_status_t tlv_write_len(uint8_t *buf, size_t buf_max, size_t value_len,
                           size_t *written);

tlv_status_t tlv_build(uint8_t *buf, size_t buf_max, uint16_t tag,
                       const uint8_t *value, size_t value_len, size_t *written);

tlv_status_t tlv_read_tag(const uint8_t *buf, size_t buf_len, size_t *pos,
                          uint16_t *tag_out);

tlv_status_t tlv_read_len(const uint8_t *buf, size_t buf_len, size_t *pos,
                          size_t *length_out);

typedef struct {
    uint16_t tag;
    size_t   length;
    const uint8_t *value;   
    size_t   total_size;    
} tlv_t;

tlv_status_t tlv_parse(const uint8_t *buf, size_t buf_len, size_t *pos, tlv_t *out);
 
#ifdef __cplusplus
}
#endif