bitter vs bitstream-io vs bitreader

Swiftly extracts unaligned bit-level data from a byte slice

Library for reading/writing un-aligned values from/to streams in big-endian and little-endian formats.

BitReader helps reading individual bits from a slice of bytes. You can read "unusual" numbers of bits from the byte slice, for example 13 bits at once. The reader internally keeps track of position within the buffer.