Initial release

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.

utils/binary_reader.py

@@ -0,0 +1,87 @@
+from io import BytesIO, BufferedReader
+import os
+
+
+class BinaryReader:
+    """
+    Small utility class to read binary data.
+    Also creates a "Memory Stream" if necessary
+    """
+    def __init__(self, data=None, stream=None):
+        if data:
+            self.stream = BytesIO(data)
+        elif stream:
+            self.stream = stream
+        else:
+            raise ValueError("Either bytes or a stream must be provided")
+
+        self.reader = BufferedReader(self.stream)
+
+    # region Reading
+
+    def read_int(self, signed=True):
+        return int.from_bytes(self.reader.read(4), signed=signed, byteorder='big')
+
+    def read_long(self, signed=True):
+        return int.from_bytes(self.reader.read(8), signed=signed, byteorder='big')
+
+    def read(self, length):
+        return self.reader.read(length)
+
+    def get_bytes(self):
+        return self.stream.getbuffer()
+
+    # endregion
+
+    # region Telegram custom reading
+
+    def tgread_bytes(self):
+        first_byte = self.read(1)
+        if first_byte == 254:
+            length = self.read(1) | (self.read(1) << 8) | (self.read(1) << 16)
+            padding = length % 4
+        else:
+            length = first_byte
+            padding = (length + 1) % 4
+
+        data = self.read(length)
+        if padding > 0:
+            padding = 4 - padding
+            self.read(padding)
+
+        return data
+
+    def tgread_string(self):
+        return str(self.tgread_bytes(), encoding='utf-8')
+
+    # endregion
+
+    def close(self):
+        self.reader.close()
+        # TODO Do I need to close the underlying stream?
+
+    # region Position related
+
+    def tell_position(self):
+        """Tells the current position on the stream"""
+        return self.reader.tell()
+
+    def set_position(self, position):
+        """Sets the current position on the stream"""
+        self.reader.seek(position)
+
+    def seek(self, offset):
+        """Seeks the stream position given an offset from the current position. May be negative"""
+        self.reader.seek(offset, os.SEEK_CUR)
+
+    # endregion
+
+    # region with block
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        self.close()
+
+    # endregion