mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-21 05:48:23 +00:00
83 lines
2.4 KiB
Python
83 lines
2.4 KiB
Python
# This file is part of the Trezor project.
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#
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# Copyright (C) 2012-2019 SatoshiLabs and contributors
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#
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# This library is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License version 3
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# as published by the Free Software Foundation.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the License along with this library.
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# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
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import io
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from typing import Tuple
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from . import messages, protobuf
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map_type_to_class = {}
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map_class_to_type = {}
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def build_map():
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for msg_name in dir(messages.MessageType):
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if msg_name.startswith("__"):
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continue
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if msg_name == "Literal":
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# TODO: remove this when we have a good implementation of enums
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continue
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try:
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msg_class = getattr(messages, msg_name)
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except AttributeError:
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raise ValueError(
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"Implementation of protobuf message '%s' is missing" % msg_name
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)
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if msg_class.MESSAGE_WIRE_TYPE != getattr(messages.MessageType, msg_name):
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raise ValueError(
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"Inconsistent wire type and MessageType record for '%s'" % msg_class
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)
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register_message(msg_class)
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def register_message(msg_class):
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if msg_class.MESSAGE_WIRE_TYPE in map_type_to_class:
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raise Exception(
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"Message for wire type %s is already registered by %s"
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% (msg_class.MESSAGE_WIRE_TYPE, get_class(msg_class.MESSAGE_WIRE_TYPE))
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)
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map_class_to_type[msg_class] = msg_class.MESSAGE_WIRE_TYPE
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map_type_to_class[msg_class.MESSAGE_WIRE_TYPE] = msg_class
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def get_type(msg):
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return map_class_to_type[msg.__class__]
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def get_class(t):
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return map_type_to_class[t]
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def encode(msg: protobuf.MessageType) -> Tuple[int, bytes]:
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message_type = msg.MESSAGE_WIRE_TYPE
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buf = io.BytesIO()
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protobuf.dump_message(buf, msg)
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return message_type, buf.getvalue()
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def decode(message_type: int, message_bytes: bytes) -> protobuf.MessageType:
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cls = get_class(message_type)
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buf = io.BytesIO(message_bytes)
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return protobuf.load_message(buf, cls)
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build_map()
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