#pragma once

#ifdef __cplusplus
extern "C"
{
#endif

#include "gtp1_utils.h"
#include "gtp2_utils.h"

// return GTP version 0 or 1
// return 255 if not GTP
static inline uint8_t peek_gtp_version(const char *data, uint16_t len)
{
    if (data == NULL || len == 0)
    {
        return 255;
    }

    return ((*(uint8_t *)data) >> 5) & 0x07;
}

static inline uint16_t calc_gtp_hdr_len(const char *data, uint32_t len)
{
    switch (peek_gtp_version(data, len))
    {
    case 1:
        return calc_gtp1_hdr_len(data, len);
    case 2:
        return calc_gtp2_hdr_len(data, len);
    default:
        return 0;
    }
}

static inline int gtp_hdr_to_str(const char *hdr, uint16_t len, char *buf, size_t size)
{
    switch (peek_gtp_version(hdr, len))
    {
    case 1:
        return gtp1_hdr_to_str((const struct gtp1_hdr *)hdr, buf, size);
    case 2:
        return gtp2_hdr_to_str((const struct gtp2_hdr *)hdr, buf, size);
    default:
        return 0;
    }
}

#ifdef __cplusplus
}
#endif