Source code for dfvfs.analyzer.apm_analyzer_helper
# -*- coding: utf-8 -*-
"""The Apple Partition Map (APM) 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 APMAnalyzerHelper(analyzer_helper.AnalyzerHelper):
"""APM analyzer helper."""
FORMAT_CATEGORIES = frozenset([
definitions.FORMAT_CATEGORY_VOLUME_SYSTEM])
TYPE_INDICATOR = definitions.TYPE_INDICATOR_APM
[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)
# APM signature.
# Note that technically "PM" at offset 512 is the Apple Partion Map
# signature but using the partition type is less error prone.
format_specification.AddNewSignature((
b'Apple_partition_map\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
b'\x00'), offset=560)
return format_specification
[docs]
def IsEnabled(self):
"""Determines if the analyzer helper is enabled.
Returns:
bool: True if the analyzer helper is enabled.
"""
return definitions.PREFERRED_APM_BACK_END == self.TYPE_INDICATOR
analyzer.Analyzer.RegisterHelper(APMAnalyzerHelper())