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enable 64-bit frames for large amounts of data

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This commit is contained in:
Jakob Ketterl 2019-07-19 17:01:50 +02:00
parent f1098801e2
commit 4493f369dd
1 changed files with 24 additions and 3 deletions
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27
owrx/websocket.py
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@ -23,10 +23,31 @@ class WebSocketConnection(object):
def get_header(self, size, opcode):
ws_first_byte = 0b10000000 | (opcode & 0x0F)
if (size > 125):
return bytes([ws_first_byte, 126, (size>>8) & 0xff, size & 0xff])
if (size > 2**16 - 1):
# frame size can be increased up to 2^64 by setting the size to 127
# anything beyond that would need to be segmented into frames. i don't really think we'll need more.
return bytes([
ws_first_byte,
127,
(size >> 56) & 0xff,
(size >> 48) & 0xff,
(size >> 40) & 0xff,
(size >> 32) & 0xff,
(size >> 24) & 0xff,
(size >> 16) & 0xff,
(size >> 8) & 0xff,
size & 0xff
])
elif (size > 125):
# up to 2^16 can be sent using the extended payload size field by putting the size to 126
return bytes([
ws_first_byte,
126,
(size >> 8) & 0xff,
size & 0xff
])
else:
# 256 bytes binary message in a single unmasked frame
# 125 bytes binary message in a single unmasked frame
return bytes([ws_first_byte, size])
def send(self, data):