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from typing import NamedTuple, List, Any
from enum import Enum
from tasd.constants import PacketType
from tasd.utils import *
class _VariableType(Enum):
STRING_EOP = 0x00
STRING_PLEN = 0x01
STRING_PEXP = 0x02
BYTES_EOP = 0x10
BYTES_PLEN = 0x11
BYTES_PEXP = 0x12
INT_8 = 0x20
INT_16 = 0x21
INT_24 = 0x22
INT_32 = 0x23
INT_64 = 0x24
INT_N = 0x25
UINT_8 = 0x30
UINT_16 = 0x31
UINT_24 = 0x32
UINT_32 = 0x33
UINT_64 = 0x34
UINT_N = 0x35
BOOL = 0x40
LIST_UINT_64 = 0x50
class _VariableDefinition(NamedTuple):
name: str
type: _VariableType
default: Any
class _EnumDefinition(NamedTuple):
name: str
enum: Enum
class _TASDPacket():
@classmethod
def from_bytes(cls, buffer: bytes):
self = cls()
index = 0
for variable in cls._variables:
match variable.type:
case _VariableType.STRING_EOP:
setattr(self, variable.name, readString(buffer, index, len(buffer) - index))
index = len(buffer)
case _VariableType.STRING_PLEN:
plen = readUint8(buffer, index)
index += 1
setattr(self, variable.name, readString(buffer, index, plen))
index += plen
case _VariableType.STRING_PEXP:
pexp = readUint8(buffer, index)
index += 1
plen = readIntN(buffer, index, pexp)
index += pexp
setattr(self, variable.name, readString(buffer, index, plen))
index += plen
case _VariableType.BYTES_EOP:
setattr(self, variable.name, readBytes(buffer, index, len(buffer)))
index = len(buffer)
case _VariableType.BYTES_PLEN:
plen = readUint8(buffer, index)
index += 1
setattr(self, variable.name, readBytes(buffer, index, plen))
index += plen
case _VariableType.BYTES_PEXP:
pexp = readUint8(buffer, index)
index += 1
plen = readIntN(buffer, index, pexp)
index += pexp
setattr(self, variable.name, readBytes(buffer, index, plen))
index += plen
case _VariableType.INT_8:
setattr(self, variable.name, readInt8(buffer, index))
index += 1
case _VariableType.INT_16:
setattr(self, variable.name, readInt16(buffer, index))
index += 2
case _VariableType.INT_24:
setattr(self, variable.name, readInt24(buffer, index))
index += 3
case _VariableType.INT_32:
setattr(self, variable.name, readInt32(buffer, index))
index += 4
case _VariableType.INT_64:
setattr(self, variable.name, readInt64(buffer, index))
index += 8
case _VariableType.INT_N:
pexp = readInt8(buffer, index)
index += 1
setattr(self, variable.name, readIntN(buffer, index, pexp))
index += pexp
case _VariableType.UINT_8:
setattr(self, variable.name, readUint8(buffer, index))
index += 1
case _VariableType.UINT_16:
setattr(self, variable.name, readUint16(buffer, index))
index += 2
case _VariableType.UINT_24:
setattr(self, variable.name, readUint24(buffer, index))
index += 3
case _VariableType.UINT_32:
setattr(self, variable.name, readUint32(buffer, index))
index += 4
case _VariableType.UINT_64:
setattr(self, variable.name, readUint64(buffer, index))
index += 8
case _VariableType.UINT_N:
pexp = readUint8(buffer, index)
index += 1
setattr(self, variable.name, readUintN(buffer, index, pexp))
index += pexp
case _VariableType.BOOL:
setattr(self, variable.name, readBoolean(buffer, index))
index += 1
case _VariableType.LIST_UINT_64:
l = list()
while index < len(buffer):
l.append(readUint64(buffer, index))
index += 8
setattr(self, variable.name, l)
case _:
raise ValueError("Unknown Variable Type", variable)
return self
def size(self):
size = 0
for variable in self._variables:
value = getattr(self, variable.name)
match variable.type:
case _VariableType.STRING_EOP:
size += sizeString(value)
case _VariableType.STRING_PLEN:
size += ( 1 + sizeString(value) )
case _VariableType.STRING_PEXP:
vsize = sizeString(value)
size += ( 1 + minUint(vsize) + vsize )
case _VariableType.BYTES_EOP:
size += len(value)
case _VariableType.BYTES_PLEN:
size += ( 1 + len(value) )
case _VariableType.BYTES_PEXP:
vsize = len(value)
size += ( 1 + minUint(vsize) + vsize )
case _VariableType.INT_8:
size += 1
case _VariableType.INT_16:
size += 2
case _VariableType.INT_24:
size += 3
case _VariableType.INT_32:
size += 4
case _VariableType.INT_64:
size += 8
case _VariableType.INT_N:
size += minInt(value)
case _VariableType.UINT_8:
size += 1
case _VariableType.UINT_16:
size += 2
case _VariableType.UINT_24:
size += 3
case _VariableType.UINT_32:
size += 4
case _VariableType.UINT_64:
size += 8
case _VariableType.UINT_N:
size += minUint(value)
case _VariableType.BOOL:
size += 1
case _VariableType.LIST_UINT_64:
size += ( 8 * len(value) )
case _:
raise ValueError("Unknown Variable Type", variable)
return size
def to_bytes(self):
buffer = bytearray(self.size())
index = 0
for variable in self._variables:
value = getattr(self, variable.name)
match variable.type:
case _VariableType.STRING_EOP:
writeString(value, buffer, index)
index += sizeString(value)
case _VariableType.STRING_PLEN:
plen = sizeString(value)
writeUint8(plen, buffer, index)
index += 1
writeString(value, buffer, index)
index += plen
case _VariableType.STRING_PEXP:
plen = sizeString(value)
pexp = minUint(plen)
writeUint8(pexp, buffer, index)
index += 1
writeUintN(plen, buffer, index, pexp)
index += pexp
writeString(value, buffer, index)
index += plen
case _VariableType.BYTES_EOP:
writeBytes(value, buffer, index)
index += len(value)
case _VariableType.BYTES_PLEN:
plen = len(value)
writeUint8(plen, buffer, index)
index += 1
writeBytes(value, buffer, index)
index += plen
case _VariableType.BYTES_PEXP:
plen = len(value)
pexp = minUint(plen)
writeUint8(pexp, buffer, index)
index += 1
writeUintN(plen, buffer, index, pexp)
index += pexp
writeBytes(value, buffer, index)
index += plen
case _VariableType.INT_8:
writeInt8(value, buffer, index)
index += 1
case _VariableType.INT_16:
writeInt16(value, buffer, index)
index += 2
case _VariableType.INT_24:
writeInt24(value, buffer, index)
index += 3
case _VariableType.INT_32:
writeInt32(value, buffer, index)
index += 4
case _VariableType.INT_64:
writeInt64(value, buffer, index)
index += 8
case _VariableType.INT_N:
pexp = minInt(value)
writeUint8(pexp, buffer, index)
index += 1
writeIntN(value, buffer, index, pexp)
index += pexp
case _VariableType.UINT_8:
writeUint8(value, buffer, index)
index += 1
case _VariableType.UINT_16:
writeUint16(value, buffer, index)
index += 2
case _VariableType.UINT_24:
writeUint24(value, buffer, index)
index += 3
case _VariableType.UINT_32:
writeUint32(value, buffer, index)
index += 4
case _VariableType.UINT_64:
writeUint64(value, buffer, index)
index += 8
case _VariableType.UINT_N:
pexp = minInt(value)
writeUint8(pexp, buffer, index)
index += 1
writeUintN(value, buffer, index, pexp)
index += pexp
case _VariableType.BOOL:
writeBoolean(value, buffer, index)
index += 1
case _VariableType.LIST_UINT_64:
for val in value:
writeUint64(val, buffer, index)
index += 8
case _:
raise ValueError("Unknown Variable Type", variable)
return buffer
def __repr__(self):
return f"{self._name}({', '.join(f'{var.name}={getattr(self, var.name)}' for var in self._variables)})"
_lookup_table = dict()
def _TASDPacketFactory(name: str, key: int, variables: List[_VariableDefinition] = [], enums: List[_EnumDefinition] = []):
class Packet(_TASDPacket):
_variables = variables
_key = key
_name = name
def __init__(self, **kwargs):
for variable in Packet._variables:
setattr(self, variable.name, kwargs.get(variable.name, variable.default))
for enum in enums:
setattr(Packet, enum.name, enum.enum)
_lookup_table[key] = Packet
Packet.__name__ = name
Packet.__qualname__ = name
return Packet
def _build_unknown_packet(key):
_UnknownPacket = _TASDPacketFactory(f"UnknownPacket_{key:04x}", key, [ _VariableDefinition("data", _VariableType.BYTES_EOP, b"") ])
return _UnknownPacket
def lookup_packet(key: int) -> _TASDPacket:
packet = _lookup_table.get(key, None)
if packet == None:
packet = _build_unknown_packet(key)
return packet
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