def NewFileObject(self, resolver_context):
"""Creates a new file-like object.
Args:
resolver_context (Context): resolver context.
Returns:
FileIO: file-like object.
"""
return lvm_file_io.LVMFile(resolver_context)
def testOpenClose(self):
"""Test the open and close functionality."""
path_spec = lvm_path_spec.LVMPathSpec(parent=self._qcow_path_spec,
volume_index=0)
file_object = lvm_file_io.LVMFile(self._resolver_context)
file_object.open(path_spec=path_spec)
self.assertEqual(file_object.get_size(), 4194304)
file_object.close()
path_spec = lvm_path_spec.LVMPathSpec(parent=self._qcow_path_spec,
volume_index=9)
file_object = lvm_file_io.LVMFile(self._resolver_context)
with self.assertRaises(errors.PathSpecError):
file_object.open(path_spec=path_spec)
path_spec = lvm_path_spec.LVMPathSpec(location='/lvm1',
parent=self._qcow_path_spec)
file_object = lvm_file_io.LVMFile(self._resolver_context)
file_object.open(path_spec=path_spec)
self.assertEqual(file_object.get_size(), 4194304)
file_object.close()
path_spec = lvm_path_spec.LVMPathSpec(location='/lvm0',
parent=self._qcow_path_spec)
file_object = lvm_file_io.LVMFile(self._resolver_context)
with self.assertRaises(errors.PathSpecError):
file_object.open(path_spec=path_spec)
path_spec = lvm_path_spec.LVMPathSpec(location='/lvm9',
parent=self._qcow_path_spec)
file_object = lvm_file_io.LVMFile(self._resolver_context)
with self.assertRaises(errors.PathSpecError):
file_object.open(path_spec=path_spec)
def testRead(self):
"""Test the read functionality."""
path_spec = lvm_path_spec.LVMPathSpec(parent=self._raw_path_spec,
volume_index=0)
file_object = lvm_file_io.LVMFile(self._resolver_context, path_spec)
file_object.Open()
self.assertEqual(file_object.get_size(), 4194304)
file_object.seek(0x80400)
expected_data = (
b'This is a text file.\n\nWe should be able to parse it.\n')
self.assertEqual(file_object.read(53), expected_data)
def testSeek(self):
"""Test the seek functionality."""
path_spec = lvm_path_spec.LVMPathSpec(parent=self._qcow_path_spec,
volume_index=0)
file_object = lvm_file_io.LVMFile(self._resolver_context)
file_object.open(path_spec=path_spec)
self.assertEqual(file_object.get_size(), 4194304)
file_object.seek(0x488)
self.assertEqual(file_object.get_offset(), 0x00000488)
self.assertEqual(file_object.read(11), b'/mnt/dfvfs\x00')
self.assertEqual(file_object.get_offset(), 0x00000493)
file_object.seek(-1047544, os.SEEK_END)
self.assertEqual(file_object.get_offset(), 0x00300408)
self.assertEqual(file_object.read(8), b'er,passw')
self.assertEqual(file_object.get_offset(), 0x00300410)
file_object.seek(3, os.SEEK_CUR)
self.assertEqual(file_object.get_offset(), 0x00300413)
self.assertEqual(file_object.read(7), b'\nbank,j')
self.assertEqual(file_object.get_offset(), 0x0030041a)
# Conforming to the POSIX seek the offset can exceed the file size
# but reading will result in no data being returned.
expected_offset = 4194304 + 100
file_object.seek(expected_offset, os.SEEK_SET)
self.assertEqual(file_object.get_offset(), expected_offset)
self.assertEqual(file_object.read(20), b'')
with self.assertRaises(IOError):
file_object.seek(-10, os.SEEK_SET)
# On error the offset should not change.
self.assertEqual(file_object.get_offset(), expected_offset)
with self.assertRaises(IOError):
file_object.seek(10, 5)
# On error the offset should not change.
self.assertEqual(file_object.get_offset(), expected_offset)
file_object.close()