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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;
use crate::error::{NtfsError, Result};
use crate::ntfs::Ntfs;
use crate::string::NtfsString;
use crate::structured_values::NewNtfsStructuredValue;
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<'n> {
value: NtfsAttributeValue<'n>,
name_length: u16,
}
impl<'n> NtfsVolumeName<'n> {
/// 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,
{
let value_attached = self.value.clone().attach(fs);
NtfsString::from_reader(value_attached, self.name_length(), buf)
}
}
impl<'n> NewNtfsStructuredValue<'n> for NtfsVolumeName<'n> {
fn new<T>(
_ntfs: &'n Ntfs,
_fs: &mut T,
value: NtfsAttributeValue<'n>,
length: u64,
) -> Result<Self>
where
T: Read + Seek,
{
if length < VOLUME_NAME_MIN_SIZE {
return Err(NtfsError::InvalidStructuredValueSize {
position: value.data_position().unwrap(),
ty: NtfsAttributeType::VolumeName,
expected: VOLUME_NAME_MIN_SIZE,
actual: length,
});
} else if length > VOLUME_NAME_MAX_SIZE {
return Err(NtfsError::InvalidStructuredValueSize {
position: value.data_position().unwrap(),
ty: NtfsAttributeType::VolumeName,
expected: VOLUME_NAME_MAX_SIZE,
actual: length,
});
}
let name_length = length as u16;
Ok(Self { value, name_length })
}
}
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