Source code for dfvfs.analyzer.bzip2_analyzer_helper
# -*- coding: utf-8 -*-
"""The BZIP2 format analyzer helper implementation."""
from dfvfs.analyzer import analyzer
from dfvfs.analyzer import analyzer_helper
from dfvfs.analyzer import specification
from dfvfs.lib import definitions
[docs]
class BZIP2AnalyzerHelper(analyzer_helper.AnalyzerHelper):
"""BZIP2 analyzer helper."""
FORMAT_CATEGORIES = frozenset([
definitions.FORMAT_CATEGORY_COMPRESSED_STREAM])
TYPE_INDICATOR = definitions.TYPE_INDICATOR_BZIP2
[docs]
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)
# TODO: add support for signature chains so that we add the 'BZ' at
# offset 0.
# BZIP2 compressed steam signature.
format_specification.AddNewSignature(b'\x31\x41\x59\x26\x53\x59', offset=4)
return format_specification
analyzer.Analyzer.RegisterHelper(BZIP2AnalyzerHelper())