bits-io

bits-io provides types which mimic those in std::io except which operate on the bit level instead of the byte level.

BitCursor

Mimics std::io::Cursor but tracks a bit-level position instead of a byte-level position. In addition to the standard Seek implementation which allows seeking by a number of bytes, it also provides BitSeek which allows seeking by a number of bits.

let data: Vec<u8> = vec![]

BitRead

BitRead mimics the std::io::Read trait, but its API is defined in terms of reading from "bit slices" instead of u8 slices (&[u8]) like std::io::Read. It leverages the BitSlice type defined in the bitvec crate.

BitWrite

BitWrite mimics the std::io::Read trait, but its API is defined in terms of reading from "bit slices" instead of u8 slices (&[u8]) like std::io::Read. It leverages the BitSlice type defined in the bitvec crate.

BitCursor is similar to std::io::Cursor, but allows reading non-standard-width types (e.g. u3, u7, u14) from a given buffer in addition to byte-sized chunks. It's built on top of the nsw_types crate for non-standard-width types and leverages bitvec to provide a more complete implementation.

Examples

let data: Vec<u8> = vec![0b11100000, 0b11101111];
let mut cursor = BitCursor::from_vec(data);

// Read any non-standard-width type from the cursor
let u3_val = cursor.read_u3().unwrap();
assert_eq!(u3_val, nsw_types::u3::new(0b111));
// Sizes larger than 8 bits require a byte order argument
let u13_val = cursor
    .read_u13::<crate::byte_order::NetworkOrder>()
    .unwrap();
assert_eq!(u13_val, nsw_types::u13::new(0b0000011101111));

Design

Traits

Types

BitCursor

BitCursor is analogous to the std::io::Cursor type, but its API is defined in terms of bits instead of bytes.