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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::NtfsAttributeValueAttached;
use crate::error::{NtfsError, Result};
use crate::string::NtfsString;
use binread::io::{Read, Seek};
use core::mem;
/// The smallest VolumeName attribute has a name containing just a single character.
const VOLUME_NAME_MIN_SIZE: u64 = mem::size_of::<u16>() as u64;
/// The largest VolumeName attribute has a name containing 128 UTF-16 code points (256 bytes).
const VOLUME_NAME_MAX_SIZE: u64 = 128 * mem::size_of::<u16>() as u64;
#[derive(Clone, Debug)]
pub struct NtfsVolumeName {
name_position: u64,
name_length: u16,
}
impl NtfsVolumeName {
pub(crate) fn new<T>(
attribute_position: u64,
value_attached: NtfsAttributeValueAttached<'_, '_, T>,
value_length: u64,
) -> Result<Self>
where
T: Read + Seek,
{
if value_length < VOLUME_NAME_MIN_SIZE {
return Err(NtfsError::InvalidAttributeSize {
position: attribute_position,
ty: NtfsAttributeType::VolumeName,
expected: VOLUME_NAME_MIN_SIZE,
actual: value_length,
});
} else if value_length > VOLUME_NAME_MAX_SIZE {
return Err(NtfsError::InvalidAttributeSize {
position: attribute_position,
ty: NtfsAttributeType::VolumeName,
expected: VOLUME_NAME_MAX_SIZE,
actual: value_length,
});
}
let name_position = value_attached.position();
let name_length = value_length as u16;
Ok(Self {
name_position,
name_length,
})
}
/// 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_length as usize
}
/// Reads the volume name into the given buffer, and returns an
/// [`NtfsString`] wrapping that buffer.
pub fn read_name<'a, T>(&self, fs: &mut T, buf: &'a mut [u8]) -> Result<NtfsString<'a>>
where
T: Read + Seek,
{
NtfsString::read_from_fs(fs, self.name_position, self.name_length(), buf)
}
}
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