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// Copyright 2021 Colin Finck <colin@reactos.org>
// SPDX-License-Identifier: GPL-2.0-or-later
use crate::attribute::NtfsAttributeType;
use crate::attribute_value::{NtfsAttributeValue, NtfsResidentAttributeValue};
use crate::error::{NtfsError, Result};
use crate::structured_values::{
NtfsStructuredValue, NtfsStructuredValueFromResidentAttributeValue,
};
use binread::io::{Cursor, Read, Seek};
use binread::{BinRead, BinReaderExt};
use bitflags::bitflags;
/// Size of all [`VolumeInformationData`] fields.
const VOLUME_INFORMATION_SIZE: usize = 12;
#[derive(BinRead, Clone, Debug)]
struct VolumeInformationData {
reserved: u64,
major_version: u8,
minor_version: u8,
flags: u16,
}
bitflags! {
/// Flags returned by [`NtfsVolumeInformation::flags`].
pub struct NtfsVolumeFlags: u16 {
/// The volume needs to be checked by `chkdsk`.
const IS_DIRTY = 0x0001;
const RESIZE_LOG_FILE = 0x0002;
const UPGRADE_ON_MOUNT = 0x0004;
const MOUNTED_ON_NT4 = 0x0008;
const DELETE_USN_UNDERWAY = 0x0010;
const REPAIR_OBJECT_ID = 0x0020;
const CHKDSK_UNDERWAY = 0x4000;
const MODIFIED_BY_CHKDSK = 0x8000;
}
}
/// Structure of a $VOLUME_INFORMATION attribute.
///
/// This attribute is only used by the top-level $Volume file and contains general information about the filesystem.
/// You can easily access it via [`Ntfs::volume_info`].
///
/// A $VOLUME_INFORMATION attribute is always resident.
///
/// Reference: <https://flatcap.github.io/linux-ntfs/ntfs/attributes/volume_information.html>
///
/// [`Ntfs::volume_info`]: crate::Ntfs::volume_info
#[derive(Clone, Debug)]
pub struct NtfsVolumeInformation {
info: VolumeInformationData,
}
impl NtfsVolumeInformation {
fn new<T>(r: &mut T, position: u64, value_length: u64) -> Result<Self>
where
T: Read + Seek,
{
if value_length < VOLUME_INFORMATION_SIZE as u64 {
return Err(NtfsError::InvalidStructuredValueSize {
position,
ty: NtfsAttributeType::StandardInformation,
expected: VOLUME_INFORMATION_SIZE as u64,
actual: value_length,
});
}
let info = r.read_le::<VolumeInformationData>()?;
Ok(Self { info })
}
/// Returns flags set for this NTFS filesystem/volume as specified by [`NtfsVolumeFlags`].
pub fn flags(&self) -> NtfsVolumeFlags {
NtfsVolumeFlags::from_bits_truncate(self.info.flags)
}
/// Returns the major NTFS version of this filesystem (e.g. `3` for NTFS 3.1).
pub fn major_version(&self) -> u8 {
self.info.major_version
}
/// Returns the minor NTFS version of this filesystem (e.g. `1` for NTFS 3.1).
pub fn minor_version(&self) -> u8 {
self.info.minor_version
}
}
impl<'n, 'f> NtfsStructuredValue<'n, 'f> for NtfsVolumeInformation {
const TY: NtfsAttributeType = NtfsAttributeType::VolumeInformation;
fn from_attribute_value<T>(fs: &mut T, value: NtfsAttributeValue<'n, 'f>) -> Result<Self>
where
T: Read + Seek,
{
let position = value.data_position().unwrap();
let value_length = value.len();
let mut value_attached = value.attach(fs);
Self::new(&mut value_attached, position, value_length)
}
}
impl<'n, 'f> NtfsStructuredValueFromResidentAttributeValue<'n, 'f> for NtfsVolumeInformation {
fn from_resident_attribute_value(value: NtfsResidentAttributeValue<'f>) -> Result<Self> {
let position = value.data_position().unwrap();
let value_length = value.len();
let mut cursor = Cursor::new(value.data());
Self::new(&mut cursor, position, value_length)
}
}
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