Source code for dfvfs.analyzer.modi_analyzer_helper
# -*- coding: utf-8 -*-
"""The Mac OS disk image (MODI) 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 MODIAnalyzerHelper(analyzer_helper.AnalyzerHelper):
"""Mac OS disk image (MODI) analyzer helper."""
FORMAT_CATEGORIES = frozenset([
definitions.FORMAT_CATEGORY_STORAGE_MEDIA_IMAGE])
TYPE_INDICATOR = definitions.TYPE_INDICATOR_MODI
[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)
# Sparse disk image (.sparseimage) signature in header.
format_specification.AddNewSignature(b'sprs', offset=0)
# Universal Disk Image Format (UDIF) (.dmg) signature in footer.
format_specification.AddNewSignature(b'koly', offset=-512)
return format_specification
analyzer.Analyzer.RegisterHelper(MODIAnalyzerHelper())