Source code for dfvfs.analyzer.tsk_analyzer_helper
# -*- coding: utf-8 -*-
"""The SleuthKit (TSK) 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 TSKAnalyzerHelper(analyzer_helper.AnalyzerHelper):
"""TSK analyzer helper."""
FORMAT_CATEGORIES = frozenset([
definitions.FORMAT_CATEGORY_FILE_SYSTEM])
TYPE_INDICATOR = definitions.TYPE_INDICATOR_TSK
[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)
if definitions.PREFERRED_FAT_BACK_END == self.TYPE_INDICATOR:
# Boot sector signature.
format_specification.AddNewSignature(b'\x55\xaa', offset=510)
# FAT-12 and FAT-16 file system hint.
format_specification.AddNewSignature(b'FAT12 ', offset=54)
format_specification.AddNewSignature(b'FAT16 ', offset=54)
# FAT-32 file system hint.
format_specification.AddNewSignature(b'FAT32 ', offset=82)
# exFAT file system signature.
format_specification.AddNewSignature(b'EXFAT ', offset=3)
if definitions.PREFERRED_NTFS_BACK_END == self.TYPE_INDICATOR:
# NTFS file system signature.
format_specification.AddNewSignature(b'NTFS ', offset=3)
if definitions.PREFERRED_HFS_BACK_END == self.TYPE_INDICATOR:
# HFS boot block signature.
# format_specification.AddNewSignature(b'LK', offset=0)
# HFS+ file system signature.
format_specification.AddNewSignature(b'H+', offset=1024)
# HFSX file system signature.
format_specification.AddNewSignature(b'HX', offset=1024)
if definitions.PREFERRED_EXT_BACK_END == self.TYPE_INDICATOR:
# Ext file system signature.
format_specification.AddNewSignature(b'\x53\xef', offset=1080)
# ISO9660 file system signature.
format_specification.AddNewSignature(b'CD001', offset=32769)
# UFS file system signature.
# YAFFS file system signature.
return format_specification
analyzer.Analyzer.RegisterHelper(TSKAnalyzerHelper())