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NamedStruct.py
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NamedStruct.py
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# retools - Reverse engineering toolkit
# Copyright (C) 2019-2019 Johannes Bauer
#
# This file is part of retools.
#
# retools is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; this program is ONLY licensed under
# version 3 of the License, later versions are explicitly excluded.
#
# retools is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with retools; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Johannes Bauer <JohannesBauer@gmx.de>
import collections
import struct
class NamedStruct(object):
def __init__(self, fields, struct_extra = "<"):
struct_format = struct_extra + ("".join(fieldtype for (fieldtype, fieldname) in fields))
self._struct = struct.Struct(struct_format)
self._collection = collections.namedtuple("Fields", [ fieldname for (fieldtype, fieldname) in fields ])
@property
def size(self):
return self._struct.size
def pack(self, data):
fields = self._collection(**data)
return self._struct.pack(*fields)
def unpack(self, data):
values = self._struct.unpack(data)
fields = self._collection(*values)
return fields
def unpack_head(self, data):
return self.unpack(data[:self._struct.size])
def unpack_from_file(self, f, at_offset = None):
if at_offset is not None:
f.seek(at_offset)
data = f.read(self._struct.size)
return self.unpack(data)