72 lines
2.6 KiB
Rust
72 lines
2.6 KiB
Rust
use alloc::sync::Arc;
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pub trait BlockDevice {
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fn sector_count(&self) -> u64;
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fn read(&self, sector: u64, sector_count: usize) -> Result<Arc<[u8]>, ()>;
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fn write(&self, sector: u64, data: &mut [u8]) -> Result<(), ()>;
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}
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#[derive(Clone, Copy, Debug, Default)]
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pub struct GPTPartitionEntry {
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pub partition_type_guid: [u8; 16],
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pub start_sector: u64,
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pub end_sector: u64,
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}
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#[derive(Debug)]
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pub struct GPTBlock {
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pub header: [u8; 8], // 0x45 0x46 0x49 0x20 0x50 0x41 0x52 0x54
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pub revision: u32,
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pub header_size: u32,
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pub header_checksum: u32, // CRC32
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_reserved: [u8; 4],
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pub header_lba: u64,
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pub header_lba_alt: u64,
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pub first_usable_block: u64,
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pub last_usable_block: u64,
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pub guid: [u8; 16],
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pub guid_lba: u64,
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pub partition_entry_count: u32,
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pub partition_entry_size: u32,
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pub partition_table_crc: u32,
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_reserved2: [u8; 512 - 0x5C],
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}
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impl GPTBlock {
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pub fn new(data: &[u8; 512]) -> Self {
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let header = data[0x00..0x08].try_into().unwrap();
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let revision = u32::from_le_bytes(data[0x08..0x0C].try_into().unwrap());
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let header_size = u32::from_le_bytes(data[0x0C..0x10].try_into().unwrap());
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let header_checksum = u32::from_le_bytes(data[0x10..0x14].try_into().unwrap());
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let _reserved = data[0x14..0x18].try_into().unwrap();
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let header_lba = u64::from_le_bytes(data[0x18..0x20].try_into().unwrap());
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let header_lba_alt = u64::from_le_bytes(data[0x20..0x28].try_into().unwrap());
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let first_usable_block = u64::from_le_bytes(data[0x28..0x30].try_into().unwrap());
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let last_usable_block = u64::from_le_bytes(data[0x30..0x38].try_into().unwrap());
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let guid = data[0x38..0x48].try_into().unwrap();
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let guid_lba = u64::from_le_bytes(data[0x48..0x50].try_into().unwrap());
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let partition_entry_count = u32::from_le_bytes(data[0x50..0x54].try_into().unwrap());
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let partition_entry_size = u32::from_le_bytes(data[0x54..0x58].try_into().unwrap());
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let partition_table_crc = u32::from_le_bytes(data[0x58..0x5C].try_into().unwrap());
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let _reserved2 = data[0x5C..512].try_into().unwrap();
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GPTBlock {
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header,
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revision,
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header_size,
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header_checksum,
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_reserved,
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header_lba,
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header_lba_alt,
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first_usable_block,
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last_usable_block,
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guid,
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guid_lba,
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partition_entry_count,
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partition_entry_size,
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partition_table_crc,
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_reserved2,
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}
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}
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}
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