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#!/usr/bin/python
#
# Copyright 2013, Joachim Metz <joachim.metz@gmail.com>.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import os
import pytsk3
class FileObjectImageInfo(pytsk3.Img_Info):
"""Class that implements a pytsk3 image object using a file-like object."""
def __init__(
self, file_object, file_size, image_type=pytsk3.TSK_IMG_TYPE_RAW):
"""Initializes the image object.
Args:
file_object: the file-like object (instance of io.FileIO).
file_size: the file size.
image_type: optional SleuthKit image type. The default is RAW
(pytsk3.TSK_IMG_TYPE_RAW).
Raises:
ValueError: if the file-like object is invalid.
"""
if not file_object:
raise ValueError(u'Missing file-like object.')
# pytsk3.Img_Info does not let you set attributes after initialization.
self._file_object = file_object
self._file_size = file_size
# Using the old parent class invocation style otherwise some versions
# of pylint complain also setting type to RAW to make sure Img_Info
# does not do detection.
pytsk3.Img_Info.__init__(self, url='', type=image_type)
# Note: that the following functions are part of the pytsk3.Img_Info object
# interface.
def close(self):
"""Closes the volume IO object."""
self._file_object = None
def read(self, offset, size):
"""Reads a byte string from the image object at the specified offset.
Args:
offset: offset where to start reading.
size: number of bytes to read.
Returns:
A byte string containing the data read.
"""
self._file_object.seek(offset, os.SEEK_SET)
return self._file_object.read(size)
def get_size(self):
"""Retrieves the size."""
return self._file_size
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