[−][src]Crate mbrman
A library that allows managing MBR partition tables.
Features
- Create primary partitions and logical volumes
- Delete primary partitions and logical volumes
- Automatically generate logical volume's EBR (or can be provided manually)
- If the disk geometry is set, the partition CHS addresses will be calculated automatically when writing to disk
Examples
Read all the partitions of a disk
let mut f = std::fs::File::open("tests/fixtures/disk1.img") .expect("could not open disk"); let mbr = mbrman::MBR::read_from(&mut f, 512) .expect("could not find MBR"); println!("Disk signature: {:?}", mbr.header.disk_signature); for (i, p) in mbr.iter() { // NOTE: The first four partitions are always provided by iter() if p.is_used() { println!("Partition #{}: type = {:?}, size = {} bytes, starting lba = {}", i, p.sys, p.sectors * mbr.sector_size, p.starting_lba); } }
Create and delete primary partitions
let mut f = std::fs::File::open("tests/fixtures/disk1.img") .expect("could not open disk"); let mut mbr = mbrman::MBR::read_from(&mut f, 512) .expect("could not find MBR"); let free_partition_number = mbr.iter().find(|(i, p)| p.is_unused()).map(|(i, _)| i) .expect("no more places available"); let sectors = mbr.get_maximum_partition_size() .expect("no more space available"); let starting_lba = mbr.find_optimal_place(sectors) .expect("could not find a place to put the partition"); mbr[free_partition_number] = mbrman::MBRPartitionEntry { boot: false, // boot flag first_chs: mbrman::CHS::empty(), // first CHS address (only useful for old computers) sys: 0x83, // Linux filesystem last_chs: mbrman::CHS::empty(), // last CHS address (only useful for old computers) starting_lba, // the sector where the partition starts sectors, // the number of sectors in that partition }; mbr[free_partition_number] = mbrman::MBRPartitionEntry::empty(); // NOTE: no modification is committed to the disk until we call mbr.write_into()
Create a new partition table from an empty disk
let ss = 512; // sector size let data = vec![0; 100 * ss as usize]; let mut cur = std::io::Cursor::new(data); let mut mbr = mbrman::MBR::new_from(&mut cur, ss as u32, [0xff; 4]) .expect("could not create partition table"); // NOTE: commit the change to the in-memory buffer mbr.write_into(&mut cur);
Add a new logical volume to the disk
let ss = 512; // sector size let data = vec![0; 100 * ss as usize]; let mut cur = std::io::Cursor::new(data); let mut mbr = mbrman::MBR::new_from(&mut cur, ss as u32, [0xff; 4]) .expect("could not create partition table"); mbr[1] = mbrman::MBRPartitionEntry { boot: false, // boot flag first_chs: mbrman::CHS::empty(), // first CHS address (only useful for old computers) sys: 0x0f, // extended partition with LBA last_chs: mbrman::CHS::empty(), // last CHS address (only useful for old computers) starting_lba: 1, // the sector where the partition starts sectors: mbr.disk_size - 1, // the number of sectors in that partition }; // this helper function will do all the hard work for you // here it creates a logical volume with Linux filesystem that occupies the entire disk // NOTE: you will lose 1 sector because it is used by the EBR mbr.push(0x83, 1, mbr.disk_size - 1); // NOTE: commit the change to the in-memory buffer mbr.write_into(&mut cur);
Add a new logical volume manually to the disk
This is useful only if you need to specify exactly where goes the EBR and the partition itself.
let ss = 512; // sector size let data = vec![0; 100 * ss as usize]; let mut cur = std::io::Cursor::new(data); let mut mbr = mbrman::MBR::new_from(&mut cur, ss as u32, [0xff; 4]) .expect("could not create partition table"); mbr[1] = mbrman::MBRPartitionEntry { boot: false, // boot flag first_chs: mbrman::CHS::empty(), // first CHS address (only useful for old computers) sys: 0x0f, // extended partition with LBA last_chs: mbrman::CHS::empty(), // last CHS address (only useful for old computers) starting_lba: 1, // the sector where the partition starts sectors: mbr.disk_size - 1, // the number of sectors in that partition }; // NOTE: mbrman won't check the consistency of the partition you have created manually mbr.logical_partitions.push( mbrman::LogicalPartition { // this is the actual partition entry for the logical volume partition: mbrman::MBRPartitionEntry { boot: false, first_chs: mbrman::CHS::empty(), sys: 0x83, last_chs: mbrman::CHS::empty(), starting_lba: 2, // the sector index 1 is used by the EBR sectors: mbr.disk_size - 2, }, // this is the absolute LBA address of the EBR absolute_ebr_lba: 1, // the number of sectors in the first EBR is never known ebr_sectors: None, // this helper generates an empty boot sector in the EBR bootstrap_code: mbrman::BootstrapCode446::new(), // this is the absolute CHS address of the EBR (only used by old computers) ebr_first_chs: mbrman::CHS::empty(), // only for old computers // this is the absolute CHS address of the last EBR (only used by old computers) // NOTE: this is not know the first EBR ebr_last_chs: None, } ); // NOTE: commit the change to the in-memory buffer mbr.write_into(&mut cur);
Structs
BootstrapCode440 | A blob of bytes |
BootstrapCode446 | A blob of bytes |
CHS | A CHS address (cylinder/head/sector) |
LogicalPartition | An abstraction struct for a logical partition |
MBR | A type representing a MBR partition table including its partition, the sector size of the disk and the alignment of the partitions to the sectors. |
MBRHeader | An MBR partition table header |
MBRPartitionEntry | An MBR partition entry |
Signature55AA | A specific signature |
Enums
Error | An error |
Type Definitions
Result | The result of reading, writing or managing a MBR. |