go get github.com/kkdai/bstream
//New a bit stream writer with default 5 byte
b := NewBStreamWriter(5)
//Write 0xa0a0 into bstream
b.WriteBits(0xa0a0, 16)
//Read 4 bit out
result, err := b.ReadBits(4)
if err != nil {
log.Printf("result:%x", result)
//result:a
}BenchmarkWriteBits-4 100000000 15.3 ns/op
BenchmarkReadBits-4 50000000 26.5 ns/op
It is one of my project 52.
This package is licensed under MIT license. See LICENSE for details.