forensicnomicon 0.2.2

The ForensicNomicon — comprehensive DFIR artifact catalog: UserAssist, Shimcache, Amcache, Prefetch, $MFT, ShellBags, EVTX, NTDS.dit, SAM, SRUM, LNK, Jump Lists + KAPE/Velociraptor/Sigma/MITRE. Zero deps.
Documentation 
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//! MBR partition type codes (the 1-byte type field in an MBR partition entry).
//!
//! Single source of truth mapping the 1-byte MBR partition type code to a
//! human-readable name, for forensic tools that parse MBR partition tables
//! (e.g. the `mbr-forensic` crate).
//!
//! Sources:
//! - Andries Brouwer, "List of partition identifiers for PCs":
//!   <https://www.win.tue.nl/~aeb/partitions/partition_types-1.html>
//! - Wikipedia, "Partition type":
//!   <https://en.wikipedia.org/wiki/Partition_type>

/// An MBR partition type code and its human-readable name.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize))]
pub struct MbrPartitionType {
    /// The 1-byte type code.
    pub code: u8,
    /// Human-readable name.
    pub name: &'static str,
}

/// Well-known MBR partition type codes. Sourced from the references above.
pub const PARTITION_TYPES: &[MbrPartitionType] = &[
    MbrPartitionType { code: 0x00, name: "Empty" },
    MbrPartitionType { code: 0x01, name: "FAT12" },
    MbrPartitionType { code: 0x04, name: "FAT16 <32 MB" },
    MbrPartitionType { code: 0x05, name: "Extended (CHS)" },
    MbrPartitionType { code: 0x06, name: "FAT16" },
    MbrPartitionType { code: 0x07, name: "NTFS / exFAT / IFS" },
    MbrPartitionType { code: 0x08, name: "FAT32 (EISA / AIX)" },
    MbrPartitionType { code: 0x0A, name: "OS/2 Boot Manager" },
    MbrPartitionType { code: 0x0B, name: "FAT32 (CHS)" },
    MbrPartitionType { code: 0x0C, name: "FAT32 (LBA)" },
    MbrPartitionType { code: 0x0E, name: "FAT16 (LBA)" },
    MbrPartitionType { code: 0x0F, name: "Extended (LBA)" },
    MbrPartitionType { code: 0x11, name: "Hidden FAT12" },
    MbrPartitionType { code: 0x12, name: "Compaq diagnostics / OEM" },
    MbrPartitionType { code: 0x14, name: "Hidden FAT16 <32 MB" },
    MbrPartitionType { code: 0x16, name: "Hidden FAT16" },
    MbrPartitionType { code: 0x17, name: "Hidden NTFS / IFS" },
    MbrPartitionType { code: 0x1B, name: "Hidden FAT32 (CHS)" },
    MbrPartitionType { code: 0x1C, name: "Hidden FAT32 (LBA)" },
    MbrPartitionType { code: 0x1E, name: "Hidden FAT16 (LBA)" },
    MbrPartitionType { code: 0x27, name: "Windows Recovery / Hidden NTFS" },
    MbrPartitionType { code: 0x39, name: "Plan 9" },
    MbrPartitionType { code: 0x42, name: "Windows LDM / Dynamic Disk" },
    MbrPartitionType { code: 0x82, name: "Linux Swap / Solaris" },
    MbrPartitionType { code: 0x83, name: "Linux" },
    MbrPartitionType { code: 0x84, name: "Hibernate (Windows)" },
    MbrPartitionType { code: 0x85, name: "Linux Extended" },
    MbrPartitionType { code: 0x86, name: "Linux LVM (old)" },
    MbrPartitionType { code: 0x87, name: "NTFS Volume Set" },
    MbrPartitionType { code: 0x8E, name: "Linux LVM" },
    MbrPartitionType { code: 0x9F, name: "BSD/OS" },
    MbrPartitionType { code: 0xA0, name: "Laptop hibernation" },
    MbrPartitionType { code: 0xA5, name: "FreeBSD" },
    MbrPartitionType { code: 0xA6, name: "OpenBSD" },
    MbrPartitionType { code: 0xA8, name: "macOS UFS" },
    MbrPartitionType { code: 0xA9, name: "NetBSD" },
    MbrPartitionType { code: 0xAB, name: "macOS Boot" },
    MbrPartitionType { code: 0xAF, name: "macOS HFS+" },
    MbrPartitionType { code: 0xBE, name: "Solaris Boot" },
    MbrPartitionType { code: 0xBF, name: "Solaris" },
    MbrPartitionType { code: 0xEB, name: "BeOS / Haiku" },
    MbrPartitionType { code: 0xEE, name: "GPT Protective MBR" },
    MbrPartitionType { code: 0xEF, name: "EFI System Partition (FAT)" },
    MbrPartitionType { code: 0xFB, name: "VMware VMFS" },
    MbrPartitionType { code: 0xFC, name: "VMware Swap" },
    MbrPartitionType { code: 0xFD, name: "Linux RAID" },
    MbrPartitionType { code: 0xFE, name: "Linux LAF / IBM IML" },
];

/// Look up an MBR partition type code's human-readable name.
///
/// Returns `None` for codes not in the table.
#[must_use]
pub fn type_name(code: u8) -> Option<&'static str> {
    PARTITION_TYPES
        .iter()
        .find(|t| t.code == code)
        .map(|t| t.name)
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn known_codes_resolve() {
        assert_eq!(type_name(0x00), Some("Empty"));
        assert_eq!(type_name(0x07), Some("NTFS / exFAT / IFS"));
        assert_eq!(type_name(0x83), Some("Linux"));
        assert_eq!(type_name(0xEE), Some("GPT Protective MBR"));
    }

    #[test]
    fn unknown_code_is_none() {
        assert_eq!(type_name(0xCC), None);
        assert_eq!(type_name(0xCD), None);
    }

    #[test]
    fn codes_are_unique() {
        let mut seen = std::collections::HashSet::new();
        for t in PARTITION_TYPES {
            assert!(seen.insert(t.code), "duplicate code {:#04X}", t.code);
            assert!(!t.name.is_empty());
        }
    }
}