Source code for dfvfs.analyzer.cpio_analyzer_helper
# -*- coding: utf-8 -*-
"""The CPIO 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 CPIOAnalyzerHelper(analyzer_helper.AnalyzerHelper):
"""CPIO analyzer helper."""
FORMAT_CATEGORIES = frozenset([
definitions.FORMAT_CATEGORY_ARCHIVE])
TYPE_INDICATOR = definitions.TYPE_INDICATOR_CPIO
[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)
# CPIO binary file big-endian signature.
format_specification.AddNewSignature(b'\x71\xc7', offset=0)
# CPIO binary file little-endian signature.
format_specification.AddNewSignature(b'\xc7\x71', offset=0)
# CPIO portable ASCII file signature.
format_specification.AddNewSignature(b'070707', offset=0)
# CPIO new ASCII file signature.
format_specification.AddNewSignature(b'070701', offset=0)
# CPIO new ASCII file with checksum signature.
format_specification.AddNewSignature(b'070702', offset=0)
return format_specification
analyzer.Analyzer.RegisterHelper(CPIOAnalyzerHelper())