Compute Shannon Entropy for a byte stream
See: http://mathworld.wolfram.com/Entropy.html
The command line tool can be invoked without any arguments. It will emit the bits-per-byte value of entropy before it exits.
$ dd if=/dev/random bs=128 count=1 | ./main
1+0 records in
1+0 records out
128 bytes transferred in 0.000020 secs (6391320 bytes/sec)
6.506879566572159
No particular optimizations have been done. This is a simple implementation.
$ go test -bench=.
PASS
BenchmarkShannon 50000 72996 ns/op
ok github.com/lazybeaver/entropy 4.398s