mirror of
https://github.com/LonamiWebs/Telethon.git
synced 2025-06-18 02:56:39 +00:00
1dac866118
The initial release contains the most basic implementation of TLSharp core. This is also fully untested, since no test can be done until more work is done.
94 lines
2.4 KiB
Python
94 lines
2.4 KiB
Python
from io import BytesIO, BufferedWriter
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from struct import pack
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class BinaryWriter:
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"""
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Small utility class to write binary data.
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Also creates a "Memory Stream" if necessary
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"""
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def __init__(self, stream=None):
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if not stream:
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stream = BytesIO()
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self.stream = stream
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self.writer = BufferedWriter(self.stream)
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# region Writing
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def write_byte(self, byte):
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self.writer.write(pack('B', byte))
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def write_int(self, integer, signed=True):
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if not signed:
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integer &= 0xFFFFFFFF # Ensure it's unsigned (see http://stackoverflow.com/a/30092291/4759433)
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self.writer.write(pack('I', integer))
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def write_long(self, long, signed=True):
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if not signed:
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long &= 0xFFFFFFFFFFFFFFFF
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self.writer.write(pack('Q', long))
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def write(self, data):
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self.writer.write(data)
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# endregion
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# region Telegram custom writing
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def tgwrite_bytes(self, data):
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if len(data) < 254:
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padding = (len(data) + 1) % 4
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if padding != 0:
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padding = 4 - padding
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self.write(bytes([len(data)]))
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self.write(data)
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else:
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padding = len(data) % 4
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if padding != 0:
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padding = 4 - padding
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# TODO ensure that _this_ is right (it appears to be)
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self.write(bytes([254]))
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self.write(bytes([len(data) % 256]))
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self.write(bytes([(len(data) >> 8) % 256]))
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self.write(bytes([(len(data) >> 16) % 256]))
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self.write(data)
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""" Original:
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binaryWriter.Write((byte)254);
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binaryWriter.Write((byte)(bytes.Length));
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binaryWriter.Write((byte)(bytes.Length >> 8));
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binaryWriter.Write((byte)(bytes.Length >> 16));
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"""
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self.write(bytes(padding))
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def tgwrite_string(self, string):
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return self.tgwrite_bytes(string.encode('utf-8'))
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# endregion
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def flush(self):
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self.writer.flush()
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def close(self):
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self.writer.close()
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# TODO Do I need to close the underlying stream?
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def get_bytes(self, flush=True):
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if flush:
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self.writer.flush()
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self.stream.getbuffer()
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# with block
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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self.close()
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