minnow 0.1.0

A library and derive macro for extremely compact encoding of structs using arithmetic coding.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64

use std::io;

use bitstream_io::{BigEndian, BitRead, BitReader, BitWrite, BitWriter};

use crate::{
    encodeable_custom::EncodeableCustom,
    visitor::{DecodeVisitor, EncodeVisitor},
};

pub trait Encodeable {
    fn encode<W>(&self, visitor: &mut EncodeVisitor<W>) -> io::Result<()>
    where
        W: BitWrite;

    fn encode_bytes(&self) -> io::Result<Vec<u8>> {
        let mut bit_writer = BitWriter::endian(Vec::new(), BigEndian);
        let mut encoder = EncodeVisitor::new(32, &mut bit_writer);

        self.encode(&mut encoder)?;
        encoder.flush()?;
        bit_writer.byte_align()?;
        bit_writer.flush()?;

        Ok(bit_writer.into_writer())
    }

    fn decode<R>(visitor: &mut DecodeVisitor<R>) -> io::Result<Self>
    where
        R: BitRead,
        Self: Sized;

    fn decode_bytes(bytes: &[u8]) -> io::Result<Self>
    where
        Self: Sized,
    {
        let bit_reader = BitReader::endian(bytes, BigEndian);
        let mut decoder = DecodeVisitor::new(32, bit_reader);

        Self::decode(&mut decoder)
    }
}

impl<T, C> Encodeable for T
where
    T: EncodeableCustom<Config = C>,
    C: Default,
{
    fn encode<W>(&self, visitor: &mut EncodeVisitor<W>) -> io::Result<()>
    where
        W: BitWrite,
    {
        let config = C::default();
        self.encode_with_config(visitor, config)
    }

    fn decode<R>(visitor: &mut DecodeVisitor<R>) -> io::Result<Self>
    where
        R: BitRead,
        Self: Sized,
    {
        let config = C::default();
        Self::decode_with_config(visitor, config)
    }
}