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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::error::{NtfsError, Result};
use crate::string::NtfsString;
use crate::structured_values::{NtfsStructuredValue, NtfsStructuredValueFromSlice};
use arrayvec::ArrayVec;
use core::mem;
/// The smallest VolumeName attribute has a name containing just a single character.
const VOLUME_NAME_MIN_SIZE: usize = mem::size_of::<u16>();
/// The largest VolumeName attribute has a name containing 128 UTF-16 code points (256 bytes).
const VOLUME_NAME_MAX_SIZE: usize = 128 * mem::size_of::<u16>();
#[derive(Clone, Debug)]
pub struct NtfsVolumeName {
name: ArrayVec<u8, VOLUME_NAME_MAX_SIZE>,
}
impl NtfsVolumeName {
/// Gets the file name and returns it wrapped in an [`NtfsString`].
pub fn name<'s>(&'s self) -> NtfsString<'s> {
NtfsString(&self.name)
}
/// Returns the volume name length, in bytes.
///
/// A volume name has a maximum length of 128 UTF-16 code points (256 bytes).
pub fn name_length(&self) -> usize {
self.name.len()
}
}
impl NtfsStructuredValue for NtfsVolumeName {
const TY: NtfsAttributeType = NtfsAttributeType::VolumeName;
}
impl<'s> NtfsStructuredValueFromSlice<'s> for NtfsVolumeName {
fn from_slice(slice: &'s [u8], position: u64) -> Result<Self> {
if slice.len() < VOLUME_NAME_MIN_SIZE {
return Err(NtfsError::InvalidStructuredValueSize {
position,
ty: NtfsAttributeType::VolumeName,
expected: VOLUME_NAME_MIN_SIZE,
actual: slice.len(),
});
} else if slice.len() > VOLUME_NAME_MAX_SIZE {
return Err(NtfsError::InvalidStructuredValueSize {
position,
ty: NtfsAttributeType::VolumeName,
expected: VOLUME_NAME_MAX_SIZE,
actual: slice.len(),
});
}
let mut name = ArrayVec::new();
name.try_extend_from_slice(slice).unwrap();
Ok(Self { name })
}
}
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