Replicate the following C structures in asm:

• FFOBJID - done
• FIL - done
• DIR - done
• FILINFO - done

Add the following methods:

• mos_GETFIL
• mos_FREAD
• mos_FWRITE
• mos_FLSEEK

Implement the following methods:

• ffs_api_fopen - done
• ffs_api_fclose - done
• ffs_api_fread - done
• ffs_api_fwrite - done
• ffs_api_flseek - done
• ffs_api_feof - done
• ffs_api_stat - done