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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| # -*- coding: utf-8 -*- | ||
| """The EXT format analyzer helper implementation.""" | ||
|
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| from __future__ import unicode_literals | ||
|
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| from dfvfs.analyzer import analyzer | ||
| from dfvfs.analyzer import analyzer_helper | ||
| from dfvfs.analyzer import specification | ||
| from dfvfs.lib import definitions | ||
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| class EXTAnalyzerHelper(analyzer_helper.AnalyzerHelper): | ||
| """EXT analyzer helper.""" | ||
|
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| FORMAT_CATEGORIES = frozenset([ | ||
| definitions.FORMAT_CATEGORY_FILE_SYSTEM]) | ||
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| TYPE_INDICATOR = definitions.TYPE_INDICATOR_EXT | ||
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| def GetFormatSpecification(self): | ||
| """Retrieves the format specification. | ||
| Returns: | ||
| FormatSpecification: format specification or None if the format cannot | ||
| be defined by a specification object. | ||
| """ | ||
| format_specification = specification.FormatSpecification( | ||
| self.type_indicator) | ||
|
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| # EXT file system signature. | ||
| format_specification.AddNewSignature(b'\x53\xef', offset=1080) | ||
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| return format_specification | ||
|
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| def IsEnabled(self): | ||
| """Determines if the analyzer helper is enabled. | ||
| Returns: | ||
| bool: True if the analyzer helper is enabled. | ||
| """ | ||
| return definitions.PREFERRED_EXT_BACK_END == self.TYPE_INDICATOR | ||
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|
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| analyzer.Analyzer.RegisterHelper(EXTAnalyzerHelper()) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| # -*- coding: utf-8 -*- | ||
| """The Extended File System (EXT) file-like object implementation.""" | ||
|
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| from __future__ import unicode_literals | ||
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| import os | ||
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| from dfvfs.file_io import file_io | ||
| from dfvfs.lib import errors | ||
| from dfvfs.resolver import resolver | ||
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| class EXTFile(file_io.FileIO): | ||
| """File-like object using pyfsext.file_entry""" | ||
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| def __init__(self, resolver_context): | ||
| """Initializes a file-like object. | ||
| Args: | ||
| resolver_context (Context): resolver context. | ||
| """ | ||
| super(EXTFile, self).__init__(resolver_context) | ||
| self._file_system = None | ||
| self._fsext_file_entry = None | ||
|
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| def _Close(self): | ||
| """Closes the file-like object.""" | ||
| self._fsext_file_entry = None | ||
|
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| self._file_system.Close() | ||
| self._file_system = None | ||
|
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| def _Open(self, path_spec=None, mode='rb'): | ||
| """Opens the file-like object defined by path specification. | ||
| Args: | ||
| path_spec (PathSpec): path specification. | ||
| mode (Optional[str]): file access mode. | ||
| Raises: | ||
| AccessError: if the access to open the file was denied. | ||
| IOError: if the file-like object could not be opened. | ||
| NotSupported: if a data stream, like the resource or named fork, is | ||
| requested to be opened. | ||
| OSError: if the file-like object could not be opened. | ||
| PathSpecError: if the path specification is incorrect. | ||
| ValueError: if the path specification is invalid. | ||
| """ | ||
| if not path_spec: | ||
| raise ValueError('Missing path specification.') | ||
|
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| data_stream = getattr(path_spec, 'data_stream', None) | ||
| if data_stream: | ||
| raise errors.NotSupported( | ||
| 'Open data stream: {0:s} not supported.'.format(data_stream)) | ||
|
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| self._file_system = resolver.Resolver.OpenFileSystem( | ||
| path_spec, resolver_context=self._resolver_context) | ||
|
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| file_entry = self._file_system.GetFileEntryByPathSpec(path_spec) | ||
| if not file_entry: | ||
| raise IOError('Unable to open file entry.') | ||
|
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| fsext_file_entry = file_entry.GetEXTFileEntry() | ||
| if not fsext_file_entry: | ||
| raise IOError('Unable to open EXT file entry.') | ||
|
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| self._fsext_file_entry = fsext_file_entry | ||
|
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| # Note: that the following functions do not follow the style guide | ||
| # because they are part of the file-like object interface. | ||
| # pylint: disable=invalid-name | ||
|
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| def read(self, size=None): | ||
| """Reads a byte string from the file-like object at the current offset. | ||
| The function will read a byte string of the specified size or | ||
| all of the remaining data if no size was specified. | ||
| Args: | ||
| size (Optional[int]): number of bytes to read, where None is all | ||
| remaining data. | ||
| Returns: | ||
| bytes: data read. | ||
| Raises: | ||
| IOError: if the read failed. | ||
| OSError: if the read failed. | ||
| """ | ||
| if not self._is_open: | ||
| raise IOError('Not opened.') | ||
|
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| return self._fsext_file_entry.read(size=size) | ||
|
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| def seek(self, offset, whence=os.SEEK_SET): | ||
| """Seeks to an offset within the file-like object. | ||
| Args: | ||
| offset (int): offset to seek to. | ||
| whence (Optional(int)): value that indicates whether offset is an absolute | ||
| or relative position within the file. | ||
| Raises: | ||
| IOError: if the seek failed. | ||
| OSError: if the seek failed. | ||
| """ | ||
| if not self._is_open: | ||
| raise IOError('Not opened.') | ||
|
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| self._fsext_file_entry.seek(offset, whence) | ||
|
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| def get_offset(self): | ||
| """Retrieves the current offset into the file-like object. | ||
| Return: | ||
| int: current offset into the file-like object. | ||
| Raises: | ||
| IOError: if the file-like object has not been opened. | ||
| OSError: if the file-like object has not been opened. | ||
| """ | ||
| if not self._is_open: | ||
| raise IOError('Not opened.') | ||
|
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| return self._fsext_file_entry.get_offset() | ||
|
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| def get_size(self): | ||
| """Retrieves the size of the file-like object. | ||
| Returns: | ||
| int: size of the file-like object data. | ||
| Raises: | ||
| IOError: if the file-like object has not been opened. | ||
| OSError: if the file-like object has not been opened. | ||
| """ | ||
| if not self._is_open: | ||
| raise IOError('Not opened.') | ||
|
|
||
| return self._fsext_file_entry.get_size() |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| # -*- coding: utf-8 -*- | ||
| """The EXT path specification implementation.""" | ||
|
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| from __future__ import unicode_literals | ||
|
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| from dfvfs.lib import definitions | ||
| from dfvfs.path import factory | ||
| from dfvfs.path import path_spec | ||
|
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|
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| class EXTPathSpec(path_spec.PathSpec): | ||
| """EXT path specification implementation. | ||
| Attributes: | ||
| inode (int): inode. | ||
| location (str): location. | ||
| """ | ||
|
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| TYPE_INDICATOR = definitions.TYPE_INDICATOR_EXT | ||
|
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| def __init__( | ||
| self, inode=None, location=None, parent=None, **kwargs): | ||
| """Initializes a path specification. | ||
| Note that an EXT path specification must have a parent. | ||
| Args: | ||
| inode (Optional[int]): inode. | ||
| location (Optional[str]): location. | ||
| parent (Optional[PathSpec]): parent path specification. | ||
| Raises: | ||
| ValueError: when parent or both inode and location are not set. | ||
| """ | ||
| if (not inode and not location) or not parent: | ||
| raise ValueError('Missing inode and location, or parent value.') | ||
|
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| super(EXTPathSpec, self).__init__(parent=parent, **kwargs) | ||
| self.inode = inode | ||
| self.location = location | ||
|
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| @property | ||
| def comparable(self): | ||
| """str: comparable representation of the path specification.""" | ||
| string_parts = [] | ||
|
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| if self.inode is not None: | ||
| string_parts.append('inode: {0:d}'.format(self.inode)) | ||
| if self.location is not None: | ||
| string_parts.append('location: {0:s}'.format(self.location)) | ||
|
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| return self._GetComparable(sub_comparable_string=', '.join(string_parts)) | ||
|
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|
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| factory.Factory.RegisterPathSpec(EXTPathSpec) |
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