RDSV3_HEADER_EXT_SPACE
if (ext_len >= RDSV3_HEADER_EXT_SPACE)
if (offset >= RDSV3_HEADER_EXT_SPACE)
if (offset + ext_len > RDSV3_HEADER_EXT_SPACE)
*pos = RDSV3_HEADER_EXT_SPACE;
uint8_t h_exthdr[RDSV3_HEADER_EXT_SPACE];