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datagram.py
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datagram.py
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from struct import pack
class Datagram(object):
""" Reimplementation of Panda's Datagram in Python. """
__slots__ = ('data', 'stdfloat_format')
def __init__(self, stdfloat_double=False):
self.data = bytearray()
self.stdfloat_format = 'd' if stdfloat_double else 'f'
def add_bool(self, value):
self.data.append(int(bool(value)))
def add_int8(self, value):
self.data += pack('<b', value)
def add_int16(self, value):
self.data += pack('<h', value)
def add_int32(self, value):
self.data += pack('<i', value)
def add_int64(self, value):
self.data += pack('<q', value)
def add_uint8(self, value):
self.data += pack('<B', value)
def add_uint16(self, value):
self.data += pack('<H', value)
def add_uint32(self, value):
self.data += pack('<I', value)
def add_uint64(self, value):
self.data += pack('<Q', value)
def add_float32(self, value):
self.data += pack('<f', value)
def add_float64(self, value):
self.data += pack('<d', value)
def add_stdfloat(self, value):
self.data += pack('<' + self.stdfloat_format, value)
def add_vec2(self, vec):
self.data += pack('<' + self.stdfloat_format * 2, *vec)
def add_vec3(self, vec):
self.data += pack('<' + self.stdfloat_format * 3, *vec)
def add_vec4(self, vec):
self.data += pack('<' + self.stdfloat_format * 4, *vec)
def add_string(self, value):
if isinstance(value, str):
value = value.encode('utf-8')
assert len(value) <= 65535
self.data += pack('<H', len(value))
self.data += value
def __bytes__(self):
return pack('<I', len(self.data)) + self.data