large-file-upload: update code for -B option based on feedback from PR

The code has been updated so that if the _binaryBuffSize (which is specified
via the -B option) is larger than the notecard's binary max, the max value
is used

python-large-file-upload/notecardDataTransfer.py

@@ -96,18 +96,21 @@ def _writeAndFlushBytes(self, data: io.IOBase):
         while bytesSent < totalBytes:
             binary_helpers.binary_store_reset(self._card)
             rsp = self._sendRequest("card.binary")
-            max = rsp.get("max", 0)
 
+            # First set the buffer size to be equal to the max binary buffer size supported by the notecard,
+            # then check if the user has specified a smaller buffer size through the -B/--binary-size flag
+            buffSize = rsp.get("max", 0)
             if self._binaryBuffSize is not None:
-                buffSize = self._binaryBuffSize
-            else:
-                buffSize = max
+                buffSize = min(self._binaryBuffSize, buffSize)
 
+            # Create a buffer of the specified size
             buffer = bytearray(buffSize)
-            numBytes = data.readinto(buffer)
 
+            # Read the data from the file and store it in the notecard's binary store
+            numBytes = data.readinto(buffer)
             binary_helpers.binary_store_transmit(self._card, buffer[0:numBytes], 0)
-
+
+            # Send the binary data to notehub
             self._writeWebReqBinary(bytesSent, totalBytes)
 
             bytesSent += numBytes