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Improve unhelpful 'readexactly size can not be less than zero'

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Technically closes #4092, as the error is now properly handled.
This commit is contained in:
Lonami Exo 2023-04-29 12:33:32 +02:00
parent 9aad453e1a
commit 03ff996ace
1 changed files with 5 additions and 0 deletions
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telethon/network/connection/tcpfull.py
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@ -30,6 +30,11 @@ class FullPacketCodec(PacketCodec):
# See https://github.com/LonamiWebs/Telethon/issues/4042.
body = await reader.readexactly(4)
raise InvalidBufferError(body)
elif packet_len < 8:
# Currently unknown why packet_len may be less than 8 but not negative.
# Attempting to `readexactly` with less than 0 fails without saying what
# the number was which is less helpful.
raise InvalidBufferError(packet_len_seq)
body = await reader.readexactly(packet_len - 8)
checksum = struct.unpack('<I', body[-4:])[0]