Trait BitWrite

trait BitWrite

A trait for anything that can write a variable number of potentially un-aligned values to an output stream

Required Methods

fn write_bit(self: &mut Self, bit: bool) -> Result<()>

Writes a single bit to the stream. true indicates 1, false indicates 0

Errors

Passes along any I/O error from the underlying stream.

fn write<U>(self: &mut Self, bits: u32, value: U) -> Result<()>
where
    U: Numeric

Writes an unsigned value to the stream using the given number of bits.

Errors

Passes along any I/O error from the underlying stream. Returns an error if the input type is too small to hold the given number of bits. Returns an error if the value is too large to fit the given number of bits.

fn write_signed<S>(self: &mut Self, bits: u32, value: S) -> Result<()>
where
    S: SignedNumeric

Writes a twos-complement signed value to the stream with the given number of bits.

Errors

Passes along any I/O error from the underlying stream. Returns an error if the input type is too small to hold the given number of bits. Returns an error if the number of bits is 0, since one bit is always needed for the sign. Returns an error if the value is too large to fit the given number of bits.

fn write_from<V>(self: &mut Self, value: V) -> Result<()>
where
    V: Primitive

Writes whole value to the stream whose size in bits is equal to its type's size.

Errors

Passes along any I/O error from the underlying stream.

fn write_as_from<F, V>(self: &mut Self, value: V) -> Result<()>
where
    F: Endianness,
    V: Primitive

Writes whole value to the stream whose size in bits is equal to its type's size in an endianness that may be different from the stream's endianness.

Errors

Passes along any I/O error from the underlying stream.

fn byte_aligned(self: &Self) -> bool

Returns true if the stream is aligned at a whole byte.

Provided Methods

fn write_out<BITS: u32, U>(self: &mut Self, value: U) -> Result<()>
where
    U: Numeric

Writes an unsigned value to the stream using the given const number of bits.

Errors

Passes along any I/O error from the underlying stream. Returns an error if the value is too large to fit the given number of bits. A compile-time error occurs if the given number of bits is larger than the output type.

fn write_signed_out<BITS: u32, S>(self: &mut Self, value: S) -> Result<()>
where
    S: SignedNumeric

Writes a twos-complement signed value to the stream with the given const number of bits.

Errors

Passes along any I/O error from the underlying stream. Returns an error if the value is too large to fit the given number of bits. A compile-time error occurs if the number of bits is 0, since one bit is always needed for the sign. A compile-time error occurs if the given number of bits is larger than the output type.

fn write_bytes(self: &mut Self, buf: &[u8]) -> Result<()>

Writes the entirety of a byte buffer to the stream.

Errors

Passes along any I/O error from the underlying stream.

Example

use std::io::Write;
use bitstream_io::{BigEndian, BitWriter, BitWrite};
let mut writer = BitWriter::endian(Vec::new(), BigEndian);
writer.write(8, 0x66).unwrap();
writer.write(8, 0x6F).unwrap();
writer.write(8, 0x6F).unwrap();
writer.write_bytes(b"bar").unwrap();
assert_eq!(writer.into_writer(), b"foobar");

fn write_unary0(self: &mut Self, value: u32) -> Result<()>

Writes value number of 1 bits to the stream and then writes a 0 bit. This field is variably-sized.

Errors

Passes along any I/O error from the underyling stream.

Examples

use std::io::Write;
use bitstream_io::{BigEndian, BitWriter, BitWrite};
let mut writer = BitWriter::endian(Vec::new(), BigEndian);
writer.write_unary0(0).unwrap();
writer.write_unary0(3).unwrap();
writer.write_unary0(10).unwrap();
assert_eq!(writer.into_writer(), [0b01110111, 0b11111110]);

use std::io::Write;
use bitstream_io::{LittleEndian, BitWriter, BitWrite};
let mut writer = BitWriter::endian(Vec::new(), LittleEndian);
writer.write_unary0(0).unwrap();
writer.write_unary0(3).unwrap();
writer.write_unary0(10).unwrap();
assert_eq!(writer.into_writer(), [0b11101110, 0b01111111]);

fn write_unary1(self: &mut Self, value: u32) -> Result<()>

Writes value number of 0 bits to the stream and then writes a 1 bit. This field is variably-sized.

Errors

Passes along any I/O error from the underyling stream.

Example

use std::io::Write;
use bitstream_io::{BigEndian, BitWriter, BitWrite};
let mut writer = BitWriter::endian(Vec::new(), BigEndian);
writer.write_unary1(0).unwrap();
writer.write_unary1(3).unwrap();
writer.write_unary1(10).unwrap();
assert_eq!(writer.into_writer(), [0b10001000, 0b00000001]);

use std::io::Write;
use bitstream_io::{LittleEndian, BitWriter, BitWrite};
let mut writer = BitWriter::endian(Vec::new(), LittleEndian);
writer.write_unary1(0).unwrap();
writer.write_unary1(3).unwrap();
writer.write_unary1(10).unwrap();
assert_eq!(writer.into_writer(), [0b00010001, 0b10000000]);

fn build<T: ToBitStream>(self: &mut Self, build: &T) -> Result<(), <T as >::Error>

Builds and writes complex type

fn build_with<'a, T: ToBitStreamWith<'a>>(self: &mut Self, build: &T, context: &<T as >::Context) -> Result<(), <T as >::Error>

Builds and writes complex type with context

fn byte_align(self: &mut Self) -> Result<()>

Pads the stream with 0 bits until it is aligned at a whole byte. Does nothing if the stream is already aligned.

Errors

Passes along any I/O error from the underyling stream.

Example

use std::io::Write;
use bitstream_io::{BigEndian, BitWriter, BitWrite};
let mut writer = BitWriter::endian(Vec::new(), BigEndian);
writer.write(1, 0).unwrap();
writer.byte_align().unwrap();
writer.write(8, 0xFF).unwrap();
assert_eq!(writer.into_writer(), [0x00, 0xFF]);

Implementors