Crate fat_fs_types

Rust crate fat_fs_types

Low-level #![no_std] helper library for accessing Microsoft’s FAT12/16/32 and exFAT file systems. Only defines constants, types and some very simple functions.

You will want to use one of the features zerocopy or bytemuck (together with the respective crate).

A lot of the structs in here only implement Copy if you have feature = "bytemuck" enabled since some of them are quite large. All #[repr(C)] structs with public fields have a stable layout, no padding and an alignment of 1.

• EFI FAT specification: download
• exFAT specification

License

This crate is licensed under the MIT license.

Re-exports

• pub use bytemuck;
• pub use zerocopy;

Modules

• exfat
  exFAT.
• fat
  FAT12/16/32.

Structs

• ChsAddr
  A cylinder-head-sector address in the format used by x86’s interrupt 0x13.
• DiskGeometry
  Hard disk geometry values used by x86’s interrupt 0x13.
• PackDateError
  Error thrown by pack_date.

Constants

• MAX_BLK_SIZE
• MAX_YEAR
• MIN_BLK_SIZE
• MIN_YEAR
• NONEXISTENT_CLUSTERS
  Number of clusters that show up at the start of the FAT but don’t correspond to a heap allocation.

Functions

• pack_date
  Encodes (year, month, day) into a packed native-endian FAT/exFAT date.
• pack_time
  Encodes (hours, minutes, millis) into a packed native-endian FAT/exFAT time, rounding down.
• unpack_date
  Decodes a packed native-endian FAT/exFAT date into (year, month, day).
• unpack_time
  Decodes a packed native-endian FAT/exFAT time into (hours, minutes, millis).

Type Aliases

• ClusterIdx
• Guid
  A globally unique identifier (usually called universally unique identifier/UUID outside the Microsoft world) with mixed endianness.
• Lba
  Logical block addressing address or offset.
• U16Le
  Unaligned little-endian 16-bit integer.
• U32Le
  Unaligned little-endian 32-bit integer.
• U64Le
  Unaligned little-endian 64-bit integer.