| 1 | #!/bin/bash␊ |
| 2 | ␊ |
| 3 | echo "==============================================="␊ |
| 4 | echo "Check the FAT type"␊ |
| 5 | echo "******************"␊ |
| 6 | ␊ |
| 7 | # Receives passed value for the raw Target Device␊ |
| 8 | # for example: /dev/rdisk0s2␊ |
| 9 | # Then looks for the following in the partition boot sector␊ |
| 10 | # Byte number 19 to see if it's either 00 or 02␊ |
| 11 | # Byte number 22 to see if it's either F8 or F0␊ |
| 12 | # Byte number 25 to see if it's either 3F or 20␊ |
| 13 | #␊ |
| 14 | # Exit with value 1 for FAT16, 2 for FAT32 ␊ |
| 15 | # Exit with value 0 if nothing is found - this shouldn't happen.?␊ |
| 16 | ␊ |
| 17 | if [ "$#" -eq 1 ]; then␊ |
| 18 | ␉targetDeviceRaw="$1"␊ |
| 19 | ␉echo "DEBUG: passed argument = $targetDeviceRaw"␊ |
| 20 | fi␊ |
| 21 | ␊ |
| 22 | ␊ |
| 23 | partitionBootSector=$( dd 2>/dev/null if="$targetDeviceRaw" count=1 | perl -ne '@a=split"";for(@a){printf"%02x",ord}' )␊ |
| 24 | if [ "${partitionBootSector:36:2}" == "00" ] && [ "${partitionBootSector:42:2}" == "f8" ] && [ "${partitionBootSector:48:2}" == "3f" ]; then␊ |
| 25 | ␉echo "Found a FAT32 device formatted by Windows Explorer"␊ |
| 26 | ␉echo "-----------------------------------------------"␊ |
| 27 | ␉echo ""␊ |
| 28 | ␉exit 2␊ |
| 29 | fi␊ |
| 30 | if [ "${partitionBootSector:36:2}" == "02" ] && [ "${partitionBootSector:42:2}" == "f8" ] && [ "${partitionBootSector:48:2}" == "3f" ]; then␊ |
| 31 | ␉echo "Found a FAT16 device formatted by Windows Explorer"␊ |
| 32 | ␉echo "-----------------------------------------------"␊ |
| 33 | ␉echo ""␊ |
| 34 | ␉exit 1␊ |
| 35 | fi␊ |
| 36 | if [ "${partitionBootSector:36:2}" == "00" ] && [ "${partitionBootSector:42:2}" == "f0" ] && [ "${partitionBootSector:48:2}" == "20" ]; then␊ |
| 37 | ␉echo "Found a FAT32 device formatted by OSX Disk Utility"␊ |
| 38 | ␉echo "-----------------------------------------------"␊ |
| 39 | ␉echo ""␊ |
| 40 | ␉exit 2␊ |
| 41 | fi␊ |
| 42 | if [ "${partitionBootSector:36:2}" == "02" ] && [ "${partitionBootSector:42:2}" == "f0" ] && [ "${partitionBootSector:48:2}" == "20" ]; then␊ |
| 43 | ␉echo "Found a FAT16 device formatted by OSX Disk Utility"␊ |
| 44 | ␉echo "-----------------------------------------------"␊ |
| 45 | ␉echo ""␊ |
| 46 | ␉exit 1␊ |
| 47 | fi␊ |
| 48 | ␊ |
| 49 | echo "-----------------------------------------------"␊ |
| 50 | echo ""␊ |
| 51 | exit 0 |
