Metadata-Version: 2.1
Name: packeteer
Version: 0.4
Summary: Light-weight packet serializer
Home-page: https://github.com/lungdart/packeteer
Author: lungdart
Author-email: dev@lungdart.net
License: MIT
Description: 
        # Packeteer: The packet serializer
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        ![GitHub](https://img.shields.io/github/license/lungdart/packeteer.svg)
        
        **Packeteer** is a light-weight packet serializer capable of translating between raw bytes and custom packet objects; Objects which are easier to understand, display, and work with
        
        ```python
        import socket
        from packeteer import packets, fields
        
        HOST = '127.0.0.1'
        PORT = '1234'
        
        class Request(packets.BigEndian):
            """ Request packet """
            fields = [
                fields.UInt8('type'),
                fields.UInt8('size'),
                fields.Raw('data', size='size')
            ]
        
        class Response(packets.BigEndian):
            """ Response packet """
            fields = [
                fields.Bool('success'),
                fields.Uint32('transfered'),
            ]
        
        if __name__ == '__main__':
            data = b'Hello World'
            request = RequestPacket(type=0, data=data)
            response = ResponsePacket()
        
            with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
                s.connect()
                s.sendall(request)
                raw = s.recv(response.size())
                response.unpack(raw)
        
            print(repr(response))
        
        # <Packet: Response packet>
        #   success: True
        #   transfered: 11
        ```
        
        
        ## Installation
        **Packeteer** is available on PyPi, and can be installed with pip directly
        ```sh
        $ pip install packeteer
        ```
        
        ## Requirements
        ### Operating systems
        **Packeteer** has no OS dependencies, and should be compatible wherever python can run; However, it is only verified for Ubuntu 18.04. If you discover any issues in other environments, please open a new issue or submit a pull request.
        
        ### Python
        **Packeteer** was developed and tested against python 2.7, 3.5, 3.6, and 3.7.
        
        ### Dependencies
        **Packeteer** depends on the following packages:
        * future
        * six
        
        For development and testing, these optional dependencies are also required:
        * pytest
        * pytest-cov
        * tox
        
        ## Documentation
        ### Defining packets
        Defining packets is as simple as deriving a new class from either *packets.BigEndian* or *packets.LittleEndian* (Depending on the byte ordering of your packet structure)
        
        ```python
        import copy
        from packeteer import packets, fields
        
        class MyPacketBE(packets.BigEndian):
            name = 'Custom (Big Endian)'
            fields = [
                fields.Bool('OK'),
                fields.Int32('value', default=42)
            ]
        
        class MyPacketLE(packets.LittleEndian):
            """ Custom (Little Endian) """
            fields = copy.deepcopy(MyPacketBE.fields)
        ```
        
        Take notice that the packet definition is built using the *fields* variable, and the built-in field types; Field types and there options are explained in the fields section of the documentation.
        
        The packet name is an optional value that can be set directly, otherwise it will be coppied from the classes doc-string. If no name is found, the name will be given a default value. The name is only used for human readibility when using repr()
        
        ### Working with packets
        #### Creating new instances
        When packet objects are constructed without any parameters, their default values are stored in each field
        ```python
        from packeteer import packets, fields
        
        class MyPacket(packets.BigEndian):
            """ Custom (Big Endian) """
            fields = [
                fields.Bool('OK'),
                fields.Int32('value', default=42)
            ]
        
        packet = MyPacket()
        print(repr(packet))
        # <Packet: Custom (Big Endian)>
        #   OK: False
        #   value: 42
        ```
        
        Packets can also be constructed with non-default values by using the field names to set values
        ```python
        packet = MyPacket(OK=True)
        print(repr(packet))
        # <Packet: Custom (Big Endian)>
        #   OK: True
        #   value: 42
        
        packet2 = MyPacket(value=100)
        print(repr(packet2))
        # <Packet: Custom (Big Endian)>
        #   OK: False
        #   value: 100
        ```
        
        #### Working with packet values
        Field values can be accessed like a list (By index) or like a dictionary (By key)
        ```python
        packet = MyPacket()
        print(packet[0], packet[1])
        # False 42
        
        print(packet['OK'], packet['value'])
        # False 42
        ```
        
        Values can also be set in the same fashion
        ```python
        packet = MyPacket()
        packet[0] = True
        packet[1] = 100
        
        print(packet['OK'], packet['value'])
        # True 100
        ```
        
        #### Packing/Unpacking
        The entire purpose of this library is to work with bytes, so it should come to no surprise that packet instances can be serialized into their raw bytes and back.
        
        ```python
        packet = MyPacket()
        
        raw = b'\x01\x00\x00\x00\xFF'
        packet.unpack(raw)
        print(repr(packet))
        # <Packet: Custom (Big Endian)>
        #   OK: True
        #   value: 255
        
        raw2 = packet.pack()
        print(raw == raw2)
        # True
        ```
        
        Packet instances can be constructed directly from bytes as well using the from_raw() call
        ```python
        packet = MyPacket.from_raw(b'\x01\x00\x00\x00\xFF')
        print(repr(packet))
        # <Packet: Custom (Big Endian)>
        #   OK: True
        #   value: 255
        ```
        
        ### Fields
        The different components of the packet are referred to as fields, which are a collection of the associated value, meta data, and supporting functions.
        
        Packeteer comes with the following field types:
        * *fields.Padding*: (1 Byte) N/A
        * *fields.Bool*: (1 Byte) Boolean
        * *fields.Char*: (1 Byte) Character
        * *fields.Int8*: (1 Byte) Signed Integer
        * *fields.UInt8*: (1 Byte) Unsigned Integer
        * *fields.Int16*: (2 Byte) Signed Integer
        * *fields.UInt16*: (2 Byte) Unsigned Integer
        * *fields.Int32*: (4 Byte) Signed Integer
        * *fields.UInt32*: (4 Byte) Unsigned Integer
        * *fields.Int64*: (8 Byte) Signed Integer
        * *fields.UInt64*: (8 Byte) Unsigned Integer
        * *fields.Float*: (4 Byte) Float value
        * *fields.Double* (8 Byte) Float value
        * *fields.Raw*: (n Byte) Raw byte data as a single value
        * *fields.String*: (n Bytes) Unicode String as a single value
        
        The majority of the types are self explanatory and work identically to the others, but some like padding, string, and raw behave differently and are looked at further in the following sections
        
        #### Padding
        *fields.Padding* is a special field type that is 1 byte wide per character.
        
        Padding bytes are nameless and not associated with any value; They can't be accessed, but they are counted when packing and unpacking.
        ```python
        from packeteer import packets, fields
        
        class PaddedPacket(packets.BigEndian):
            """ Padded """
            fields = [
                fields.Padding(),
                fields.UInt8('value'),
                fields.Padding(default=b'\xff')
            ]
        
        packet = PaddedPacket(value=170)
        print(repr(packet))
        # <Packet: Padded>
        #   value: 170
        
        print(packet[0])
        # 170
        
        print(packet[1])
        # IndexError
        
        raw = packet.pack()
        print(repr(raw))
        # '\x00\xAA\xFF'
        
        packet.unpack(b'\x00\x7f\xff')
        print(repr(packet))
        # <Packet: Padded>
        #   value: 127
        ```
        
        #### Raw data and strings
        *fields.Raw* is a raw byte store of a given size (The size argument is required). If the data is too large for the field, it will be truncated to fit. Likewise if it is too short, it will be padded with null bytes.
        
        *fields.String* is an extension of *fields.Raw* that stores it's internal value as a unicode string with the encoding of your choosing (Defaults to utf8). The internal value has any trailing null byte padding removed until it is serialized.
        
        ```python
        from packeteer import packets, fields
        
        class DataPacket(packets.BigEndian):
            """ Data Packet """
            fields = [
                fields.Raw('raw', size=12),
                fields.String('string', size=12, encoding='utf8')
            ]
        
        packet = DataPacket(raw=b'Hello World', string='Hello World')
        print(repr(packet))
        # <Packet: Raw Packet>
        #   raw: b'Hello World\x00'
        #   string: u'Hellow World'
        ```
        
        
        #### List fields
        There are often times when you need to have a variable list of values in a packet (Think about a repeating set of values depending on a given count value). *fields.List* takes care of this. *fields.List* requires an additional argument of the field the list contains, with the rest of the arguments given as keywords that the underlying field type requires.
        
        ```python
        from packeteer import packets, fields
        
        class ListPacket(packets.BigEndian):
            """ List Packet """
            fields = [
                fields.UInt8('count')
                fields.List('messages', fields.String, size=128),
            ]
        
        messages = ['foo', 'bar', 'Hello World']
        packet = ListPacket(count=len(messages), messages=messages)
        print(repr(packet))
        # <Packet: List Packet>
        #   count: 3
        #   messages: [u'foo', u'bar', u'Hello World']
        ```
        
Platform: UNKNOWN
Classifier: License :: OSI Approved :: MIT License
Classifier: Natural Language :: English
Classifier: Operating System :: POSIX
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.5
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: Implementation :: CPython
Classifier: Topic :: System :: Networking
Classifier: Intended Audience :: Developers
Requires-Python: >=2.7.0
Description-Content-Type: text/markdown
