ringbuffer: fix rb_get_bytes_used (modulo overflow) #5
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Using the modulo to wrap around the buffer is unsafe because it's easy to have the values overflowing.
A simple "real" example from my debug:
Buffer size is 15Mb (15728640)
Pointer values:
tail=0x7f4b84c3b841 head=0x7f4b85b267e9
tail - head = -15642536
tail - head + buf_size = 86104 (correct)
(tail - head) % buf_size = 1134680 (wrong)
This "might" fix #3
PS:
I just got a DVB-C modulator card (with 4 modulators) and I'm testing it with this tool and will try to enhance it.
But I see that this repo isn't updated for quite some time so I'm not sure if you're really interested in PR's...