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// Copyright 2021 Colin Finck <colin@reactos.org>
// SPDX-License-Identifier: MIT OR Apache-2.0
use crate::attribute::NtfsAttributeType;
use crate::attribute_value::{NtfsAttributeValue, NtfsResidentAttributeValue};
use crate::error::{NtfsError, Result};
use crate::guid::{NtfsGuid, GUID_SIZE};
use crate::structured_values::{
NtfsStructuredValue, NtfsStructuredValueFromResidentAttributeValue,
};
use binread::io::{Cursor, Read, Seek};
use binread::BinReaderExt;
/// Structure of an $OBJECT_ID attribute.
///
/// This optional attribute contains a globally unique identifier of the file.
///
/// An $OBJECT_ID attribute is always resident.
///
/// Reference: <https://flatcap.github.io/linux-ntfs/ntfs/attributes/object_id.html>
#[derive(Clone, Debug)]
pub struct NtfsObjectId {
object_id: NtfsGuid,
birth_volume_id: Option<NtfsGuid>,
birth_object_id: Option<NtfsGuid>,
domain_id: Option<NtfsGuid>,
}
impl NtfsObjectId {
fn new<T>(r: &mut T, position: u64, value_length: u64) -> Result<Self>
where
T: Read + Seek,
{
if value_length < GUID_SIZE as u64 {
return Err(NtfsError::InvalidStructuredValueSize {
position,
ty: NtfsAttributeType::ObjectId,
expected: GUID_SIZE as u64,
actual: value_length,
});
}
let object_id = r.read_le::<NtfsGuid>()?;
let mut birth_volume_id = None;
if value_length >= 2 * GUID_SIZE as u64 {
birth_volume_id = Some(r.read_le::<NtfsGuid>()?);
}
let mut birth_object_id = None;
if value_length >= 3 * GUID_SIZE as u64 {
birth_object_id = Some(r.read_le::<NtfsGuid>()?);
}
let mut domain_id = None;
if value_length >= 4 * GUID_SIZE as u64 {
domain_id = Some(r.read_le::<NtfsGuid>()?);
}
Ok(Self {
object_id,
birth_volume_id,
birth_object_id,
domain_id,
})
}
/// Returns the (optional) first Object ID that has ever been assigned to this file.
pub fn birth_object_id(&self) -> Option<&NtfsGuid> {
self.birth_object_id.as_ref()
}
/// Returns the (optional) Object ID of the $Volume file of the partition where this file was created.
pub fn birth_volume_id(&self) -> Option<&NtfsGuid> {
self.birth_volume_id.as_ref()
}
/// Returns the (optional) Domain ID of this file.
pub fn domain_id(&self) -> Option<&NtfsGuid> {
self.domain_id.as_ref()
}
/// Returns the Object ID, a globally unique identifier of the file.
pub fn object_id(&self) -> &NtfsGuid {
&self.object_id
}
}
impl<'n, 'f> NtfsStructuredValue<'n, 'f> for NtfsObjectId {
const TY: NtfsAttributeType = NtfsAttributeType::ObjectId;
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 NtfsObjectId {
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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