Source code for dfvfs.analyzer.qcow_analyzer_helper
# -*- coding: utf-8 -*-
"""The QCOW 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 QCOWAnalyzerHelper(analyzer_helper.AnalyzerHelper):
"""QCOW analyzer helper."""
FORMAT_CATEGORIES = frozenset([
definitions.FORMAT_CATEGORY_STORAGE_MEDIA_IMAGE])
TYPE_INDICATOR = definitions.TYPE_INDICATOR_QCOW
[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)
# QCOW version 1 signature and version.
format_specification.AddNewSignature(b'QFI\xfb\x00\x00\x00\x01', offset=0)
# QCOW version 2 signature and version.
format_specification.AddNewSignature(b'QFI\xfb\x00\x00\x00\x02', offset=0)
# QCOW version 3 signature and version.
format_specification.AddNewSignature(b'QFI\xfb\x00\x00\x00\x03', offset=0)
return format_specification
analyzer.Analyzer.RegisterHelper(QCOWAnalyzerHelper())