Nicotine+ 1.4.2, Debian 9 (64-bit) Downloading file size >2GB appears as negative numbers, files near 4GB download 0 byte.

[zebulon-1st]

Surely because of the use of signed 32-bit integers.
Use either unsigned 32-bit integers, or (better) 64-bit integers.

[1] Console output, when I try to continue a file of size 3GB, and I already have downloaded more than 2GB

Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
    self.run()
  File "nicotine-plus/pynicotine/slskproto.py", line 385, in run
    conns, connsinprogress, server_socket = self.process_queue(queue, conns, connsinprogress, server_socket)
  File "nicotine-plus/pynicotine/slskproto.py", line 1004, in process_queue
    conns[msgObj.conn].obuf = conns[msgObj.conn].obuf + struct.pack("<i", msgObj.offset) + struct.pack("<i", 0)
error: 'i' format requires -2147483648 <= number <= 2147483647

After this error, all other downloads are frozen.
And, I have to

• quit Nicotine+
• delete temporary downloaded file that make the exception (3GB, downloaded 2GB+)
• restart Nicotine+
• reload from 0 that 3GB file, hoping it will be all downloaded once. If the download break after 2GB downloaded, it cannot continue because and will be frozen (as at step [1]), and all other downloads will be frozen too.