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use alloc::sync::Arc;
use core::mem::transmute;
use super::context::Context;
use super::entryset::EntryID;
use super::metadata::Metadata;
use crate::error::{AllocationError, DataError, Error, OperationError};
use crate::fat;
use crate::file::{FileOptions, TouchOptions};
use crate::fs::{self, SectorRef};
use crate::io::IOWrapper;
use crate::region::data::entryset::primary::DateTime;
use crate::region::data::entryset::{RawEntry, ENTRY_SIZE};
use crate::region::fat::Entry;
use crate::sync::Mutex;
use crate::types::ClusterID;
#[macro_export]
macro_rules! with_context {
($context: expr) => {
match () {
#[cfg(feature = "async")]
_ => $context.lock().await,
#[cfg(not(feature = "async"))]
_ => $context.lock().unwrap(),
}
};
}
pub(crate) use with_context;
#[derive(Clone)]
pub(crate) struct MetaFileDirectory<IO> {
pub io: IOWrapper<IO>,
pub context: Arc<Mutex<Context<IO>>>,
pub fat_info: fat::Info,
pub fs_info: fs::Info,
pub metadata: Metadata,
pub options: FileOptions,
pub sector_ref: SectorRef,
}
impl<IO> MetaFileDirectory<IO> {
pub(crate) fn id(&self) -> EntryID {
let entry_ref = &self.metadata.entry_ref;
EntryID { sector_id: entry_ref.sector_ref.id(&self.fs_info), index: entry_ref.index }
}
}
#[cfg_attr(not(feature = "async"), deasync::deasync)]
impl<E, IO: crate::io::IO<Error = E>> MetaFileDirectory<IO> {
pub async fn next(&mut self, sector_ref: SectorRef) -> Result<SectorRef, Error<E>> {
let fat_chain = self.metadata.stream_extension.general_secondary_flags.fat_chain();
if sector_ref.sector_index != self.fs_info.sectors_per_cluster() {
return Ok(sector_ref.next(self.fs_info.sectors_per_cluster_shift));
}
if !fat_chain {
let num_clusters = (self.metadata.length() / self.fs_info.cluster_size() as u64) as u32;
let max_cluster_id = self.sector_ref.cluster_id + num_clusters;
if sector_ref.cluster_id + 1u32 >= max_cluster_id {
return Err(OperationError::EOF.into());
}
return Ok(sector_ref.next(self.fs_info.sectors_per_cluster_shift));
}
let cluster_id = sector_ref.cluster_id;
let option = self.fat_info.fat_sector_id(cluster_id);
let sector_id = option.ok_or(Error::Data(DataError::FATChain))?;
let sector = self.io.read(sector_id).await?;
match self.fat_info.next_cluster_id(sector, sector_ref.cluster_id) {
Ok(Entry::Next(cluster_id)) => Ok(SectorRef::new(cluster_id, 0)),
Ok(Entry::Last) => Err(OperationError::EOF.into()),
_ => Err(DataError::FATChain.into()),
}
}
pub async fn touch(&mut self, datetime: DateTime, opts: TouchOptions) -> Result<(), Error<E>> {
let metadata = &mut self.metadata;
if opts.access {
metadata.file_directory.update_last_accessed_timestamp(datetime);
}
if opts.modified {
metadata.file_directory.update_last_modified_timestamp(datetime);
}
metadata.update_checksum();
Ok(())
}
}
#[cfg_attr(not(feature = "async"), deasync::deasync)]
impl<E, IO: crate::io::IO<Error = E>> MetaFileDirectory<IO> {
pub async fn allocate(&mut self, last: ClusterID) -> Result<ClusterID, Error<E>> {
trace!("Allocate cluster with last cluster {}", last);
if !self.metadata.stream_extension.general_secondary_flags.allocation_possible() {
return Err(AllocationError::NotPossible.into());
}
let fragment = !self.options.dont_fragment;
let mut context = with_context!(self.context);
let cluster_id = context.allocation_bitmap.allocate(last, fragment).await?;
let cluster_size = self.fs_info.cluster_size() as u64;
let metadata = &mut self.metadata;
let fat_chain = metadata.stream_extension.general_secondary_flags.fat_chain();
if !last.valid() {
metadata.stream_extension.first_cluster = u32::from(cluster_id).into();
metadata.stream_extension.general_secondary_flags.clear_fat_chain();
} else if last + 1u32 != cluster_id || fat_chain {
if !fat_chain && metadata.capacity() > cluster_size {
let first = self.sector_ref.cluster_id;
for i in 0..(metadata.capacity() / cluster_size - 1) {
let cluster_id = first + i as u32;
let next = cluster_id + 1u32;
let sector_id = self.fat_info.fat_sector_id(cluster_id).unwrap();
let bytes = u32::to_le_bytes(next.into());
self.io.write(sector_id, self.fat_info.offset(next), &bytes).await?;
}
metadata.stream_extension.general_secondary_flags.set_fat_chain();
}
let sector_id = self.fat_info.fat_sector_id(last).unwrap();
let bytes = u32::to_le_bytes(cluster_id.into());
self.io.write(sector_id, self.fat_info.offset(last), &bytes).await?;
let bytes = u32::to_ne_bytes(Entry::Last.into());
self.io.write(sector_id, self.fat_info.offset(cluster_id), &bytes).await?;
}
if metadata.file_directory.file_attributes().directory() > 0 {
let length = metadata.length() + cluster_size;
metadata.stream_extension.custom_defined.valid_data_length = length.into()
}
metadata.stream_extension.data_length = (metadata.capacity() + cluster_size).into();
metadata.update_checksum();
Ok(cluster_id)
}
pub async fn sync(&mut self) -> Result<(), Error<E>> {
let metadata = &mut self.metadata;
if !metadata.entry_ref.sector_ref.cluster_id.valid() {
return Ok(());
}
if metadata.dirty {
trace!("Flush metadatadata since dirty");
let mut sector_id = metadata.entry_ref.sector_ref.id(&self.fs_info);
let bytes: &RawEntry = unsafe { transmute(&metadata.file_directory) };
let offset = metadata.entry_ref.index as usize * ENTRY_SIZE;
self.io.write(sector_id, offset, &bytes[..]).await?;
let mut offset = (metadata.entry_ref.index as usize + 1) * ENTRY_SIZE;
if offset == self.fs_info.sector_size() as usize {
offset = 0;
sector_id += 1u32;
}
let bytes: &RawEntry = unsafe { transmute(&metadata.stream_extension) };
self.io.write(sector_id, offset, &bytes[..]).await?;
self.io.flush().await?;
metadata.dirty = false;
}
Ok(())
}
pub async fn close(&mut self) -> Result<(), Error<E>> {
self.sync().await?;
let mut context = with_context!(self.context);
context.opened_entries.remove(self.id());
Ok(())
}
}