2021-09-21 22:32:54 +00:00
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# SPDX-FileCopyrightText: 2021 Espressif Systems (Shanghai) CO LTD
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# SPDX-License-Identifier: Apache-2.0
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import os
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from typing import List, Optional, Tuple
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from .entry import Entry
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from .exceptions import FatalError, WriteDirectoryException
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from .fat import FAT, Cluster
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from .fatfs_state import FATFSState
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from .utils import required_clusters_count, split_content_into_sectors, split_to_name_and_extension
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class File:
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"""
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The class File provides API to write into the files. It represents file in the FS.
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"""
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ATTR_ARCHIVE = 0x20
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ENTITY_TYPE = ATTR_ARCHIVE
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def __init__(self, name: str, fat: FAT, fatfs_state: FATFSState, entry: Entry, extension: str = '') -> None:
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self.name = name
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self.extension = extension
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self.fatfs_state = fatfs_state
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self.fat = fat
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self.size = 0
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self._first_cluster = None
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self._entry = entry
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@property
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def entry(self) -> Entry:
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return self._entry
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@property
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def first_cluster(self) -> Optional[Cluster]:
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return self._first_cluster
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@first_cluster.setter
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def first_cluster(self, value: Cluster) -> None:
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self._first_cluster = value
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def name_equals(self, name: str, extension: str) -> bool:
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return self.name == name and self.extension == extension
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def write(self, content: str) -> None:
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self.entry.update_content_size(len(content))
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# we assume that the correct amount of clusters is allocated
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current_cluster = self._first_cluster
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for content_part in split_content_into_sectors(content, self.fatfs_state.sector_size):
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2021-12-29 22:22:13 +00:00
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content_as_list = content_part
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2021-09-21 22:32:54 +00:00
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if current_cluster is None:
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raise FatalError('No free space left!')
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address = current_cluster.cluster_data_address
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self.fatfs_state.binary_image[address: address + len(content_part)] = content_as_list
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current_cluster = current_cluster.next_cluster
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class Directory:
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"""
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The Directory class provides API to add files and directories into the directory
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and to find the file according to path and write it.
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"""
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ATTR_DIRECTORY = 0x10
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ATTR_ARCHIVE = 0x20
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ENTITY_TYPE = ATTR_DIRECTORY
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def __init__(self,
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name,
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fat,
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fatfs_state,
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entry=None,
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cluster=None,
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size=None,
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extension='',
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parent=None):
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# type: (str, FAT, FATFSState, Optional[Entry], Cluster, Optional[int], str, Directory) -> None
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self.name = name
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self.fatfs_state = fatfs_state
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self.extension = extension
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self.fat = fat
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self.size = size or self.fatfs_state.sector_size
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# if directory is root its parent is itself
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self.parent: Directory = parent or self
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self._first_cluster = cluster
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# entries will be initialized after the cluster allocation
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self.entries: List[Entry] = []
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self.entities = [] # type: ignore
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self._entry = entry # currently not in use (will use later for e.g. modification time, etc.)
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@property
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def is_root(self) -> bool:
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return self.parent is self
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@property
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def first_cluster(self) -> Cluster:
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return self._first_cluster
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@first_cluster.setter
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def first_cluster(self, value: Cluster) -> None:
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self._first_cluster = value
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def name_equals(self, name: str, extension: str) -> bool:
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return self.name == name and self.extension == extension
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def create_entries(self, cluster: Cluster) -> list:
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return [Entry(entry_id=i,
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parent_dir_entries_address=cluster.cluster_data_address,
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fatfs_state=self.fatfs_state)
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for i in range(self.size // self.fatfs_state.entry_size)]
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def init_directory(self) -> None:
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self.entries = self.create_entries(self._first_cluster)
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if not self.is_root:
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# the root directory doesn't contain link to itself nor the parent
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free_entry1 = self.find_free_entry() or self.chain_directory()
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free_entry1.allocate_entry(first_cluster_id=self.first_cluster.id,
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entity_name='.',
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entity_extension='',
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entity_type=self.ENTITY_TYPE)
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self.first_cluster = self._first_cluster
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free_entry2 = self.find_free_entry() or self.chain_directory()
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free_entry2.allocate_entry(first_cluster_id=self.parent.first_cluster.id,
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entity_name='..',
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entity_extension='',
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entity_type=self.parent.ENTITY_TYPE)
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self.parent.first_cluster = self.parent.first_cluster
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def lookup_entity(self, object_name: str, extension: str): # type: ignore
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for entity in self.entities:
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if entity.name == object_name and entity.extension == extension:
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return entity
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return None
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def recursive_search(self, path_as_list, current_dir): # type: ignore
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name, extension = split_to_name_and_extension(path_as_list[0])
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next_obj = current_dir.lookup_entity(name, extension)
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if next_obj is None:
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raise FileNotFoundError('No such file or directory!')
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if len(path_as_list) == 1 and next_obj.name_equals(name, extension):
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return next_obj
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return self.recursive_search(path_as_list[1:], next_obj)
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def find_free_entry(self) -> Optional[Entry]:
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for entry in self.entries:
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if entry.is_empty:
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return entry
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return None
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def _extend_directory(self) -> None:
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current = self.first_cluster
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while current.next_cluster is not None:
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current = current.next_cluster
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new_cluster = self.fat.find_free_cluster()
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current.set_in_fat(new_cluster.id)
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current.next_cluster = new_cluster
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self.entries += self.create_entries(new_cluster)
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def chain_directory(self) -> Entry:
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self._extend_directory()
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free_entry = self.find_free_entry()
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if free_entry is None:
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raise FatalError('No more space left!')
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return free_entry
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def allocate_object(self,
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name,
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entity_type,
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path_from_root=None,
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extension=''):
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# type: (str, int, Optional[List[str]], str) -> Tuple[Cluster, Entry, Directory]
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"""
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Method finds the target directory in the path
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and allocates cluster (both the record in FAT and cluster in the data region)
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and entry in the specified directory
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"""
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free_cluster = self.fat.find_free_cluster()
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target_dir = self if not path_from_root else self.recursive_search(path_from_root, self)
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free_entry = target_dir.find_free_entry() or target_dir.chain_directory()
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free_entry.allocate_entry(first_cluster_id=free_cluster.id,
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entity_name=name,
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entity_extension=extension,
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entity_type=entity_type)
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return free_cluster, free_entry, target_dir
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def new_file(self, name: str, extension: str, path_from_root: Optional[List[str]]) -> None:
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free_cluster, free_entry, target_dir = self.allocate_object(name=name,
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extension=extension,
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entity_type=Directory.ATTR_ARCHIVE,
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path_from_root=path_from_root)
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file = File(name, fat=self.fat, extension=extension, fatfs_state=self.fatfs_state, entry=free_entry)
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file.first_cluster = free_cluster
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target_dir.entities.append(file)
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def new_directory(self, name, parent, path_from_root):
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# type: (str, Directory, Optional[List[str]]) -> None
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free_cluster, free_entry, target_dir = self.allocate_object(name=name,
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entity_type=Directory.ATTR_DIRECTORY,
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path_from_root=path_from_root)
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directory = Directory(name=name, fat=self.fat, parent=parent, fatfs_state=self.fatfs_state, entry=free_entry)
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directory.first_cluster = free_cluster
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directory.init_directory()
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target_dir.entities.append(directory)
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def write_to_file(self, path: List[str], content: str) -> None:
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"""
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Writes to file existing in the directory structure.
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:param path: path split into the list
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:param content: content as a string to be written into a file
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:returns: None
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:raises WriteDirectoryException: raised is the target object for writing is a directory
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"""
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entity_to_write = self.recursive_search(path, self)
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if isinstance(entity_to_write, File):
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clusters_cnt = required_clusters_count(cluster_size=self.fatfs_state.sector_size, content=content)
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self.fat.allocate_chain(entity_to_write.first_cluster, clusters_cnt)
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entity_to_write.write(content)
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else:
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raise WriteDirectoryException(f'`{os.path.join(*path)}` is a directory!')
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