bitbuffer

Tools for reading and writing data types of arbitrary bit length and might not be byte-aligned in the source data

The main way of reading the binary data is to first create a BitReadBuffer ,wrap it into a BitReadStream and then read from the stream.

Once you have a BitStream, there are 2 different approaches of reading data

• read primitives, Strings and byte arrays, using read_bool, read_int, read_float, read_bytes and read_string
• read any type implementing the BitRead or BitReadSized traits using read and read_sized
  • BitRead is for types that can be read without requiring any size info (e.g. null-terminal strings, floats, whole integers, etc)
  • BitReadSized is for types that require external sizing information to be read (fixed length strings, arbitrary length integers

The BitRead and BitReadSized traits can be used with #[derive] if all fields implement BitRead or BitReadSized.

For writing the data you wrap the output Vec into a BitWriteStream which can then be used in a manner similar to the BitReadStream

• write primitives, Strings and byte arrays, using write_bool, write_int, write_float, write_bytes and write_string
• write any type implementing the BitWrite or BitWriteSized traits using write and write_sized
  • BitWrite is for types that can be written without requiring any size info (e.g. null-terminal strings, floats, whole integers, etc)
  • BitWriteSized is for types that require external sizing information to be written (fixed length strings, arbitrary length integers

Just like the read counterparts, BitWrite and BitWriteSized traits can be used with #[derive] if all fields implement BitWrite or BitWriteSized.

Examples

use bitbuffer::{BitReadBuffer, LittleEndian, BitReadStream, BitRead, BitWrite, BitWriteStream};

#[derive(BitRead, BitWrite)]
struct ComplexType {
    first: u8,
    #[size = 15]
    second: u16,
    third: bool,
}

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let bytes = vec![
        0b1011_0101, 0b0110_1010, 0b1010_1100, 0b1001_1001,
        0b1001_1001, 0b1001_1001, 0b1001_1001, 0b1110_0111
    ];
    let buffer = BitReadBuffer::new(&bytes, LittleEndian);
    let mut stream = BitReadStream::new(buffer);
    let value: u8 = stream.read_int(7)?;
    let complex: ComplexType = stream.read()?;

    let mut write_bytes = vec![];
    let mut write_stream = BitWriteStream::new(&mut write_bytes, LittleEndian);
    write_stream.write_int(12, 7)?;
    write_stream.write(&ComplexType {
        first: 55,
        second: 12,
        third: true
    })?;
}

License

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.