Trait BitPackOps 

pub trait BitPackOps {
    // Required methods
    fn pack(
        &self,
        decompressed: &[u32],
        compressed: &mut [u8],
        num_bits: u8,
    ) -> usize;
    fn unpack(
        &self,
        compressed: &[u8],
        decompressed: &mut [u32],
        num_bits: u8,
    ) -> usize;
    fn pack_m1(
        &self,
        decompressed: &[u32],
        compressed: &mut [u8],
        num_bits: u8,
    ) -> usize;
    fn unpack_m1(
        &self,
        compressed: &[u8],
        decompressed: &mut [u32],
        num_bits: u8,
    ) -> usize;
    fn pack_d1(
        &self,
        decompressed: &[u32],
        compressed: &mut [u8],
        num_bits: u8,
    ) -> usize;
    fn unpack_d1(
        &self,
        initial: u32,
        compressed: &[u8],
        decompressed: &mut [u32],
        num_bits: u8,
    ) -> usize;
    fn pack_d1z(
        &self,
        decompressed: &[u32],
        compressed: &mut [u8],
        num_bits: u8,
    ) -> usize;
    fn unpack_d1z(
        &self,
        initial: u32,
        compressed: &[u8],
        decompressed: &mut [u32],
        num_bits: u8,
    ) -> usize;
}

Wrappers of the orignial bitpacking trait

The panic rules of compressed and decompressed array data are exactly the same as bitpacking crate. Details can be found in bitpacking::BitPacker.

Note:

• The num_bits parameter in pack* methods can be set to 0, which means to detect actual num_bits by internally call bitpacker.num_bits() or bitpacker.num_bits_sorted()

Examples

Here are some examples for the variant bitpacking formats (from tests.rs):

use bitpacking_plus::BitPackOps;

use bitpacking::{BitPacker, BitPacker1x, BitPacker4x, BitPacker8x};
use rand::{thread_rng, Rng};

#[derive(Debug)]
enum PackMethod {
    Vanilla,
    M1,
    D1,
    D1Z,
}

fn test_unpack_helper(
    bitpacker: &dyn BitPackOps,
    decompressed: &[u32],
    compressed: &mut [u8],
    block_size: usize,
    pack_method: PackMethod,
) {
    // We only test one block.
    println!("Test method: {:?}\nBlock size: {}", &pack_method, &block_size);
    let initial = decompressed[0];
    let n1 = match pack_method {
        PackMethod::Vanilla => {
            bitpacker.pack(decompressed.get(0..block_size).unwrap(), compressed, 0)
        }
        PackMethod::M1 => {
            bitpacker.pack_m1(decompressed.get(0..block_size).unwrap(), compressed, 0)
        }
        PackMethod::D1 => {
            bitpacker.pack_d1(decompressed.get(0..block_size).unwrap(), compressed, 0)
        }
        PackMethod::D1Z => {
            bitpacker.pack_d1z(decompressed.get(0..block_size).unwrap(), compressed, 0)
        }
    };
    let num_bits = 8 * n1 / block_size;
    let mut new_decompressed = [0_u32; 256];
    let n2 = match pack_method {
        PackMethod::Vanilla => bitpacker.unpack(compressed, &mut new_decompressed, num_bits as u8),
        PackMethod::M1 => bitpacker.unpack_m1(compressed, &mut new_decompressed, num_bits as u8),
        PackMethod::D1 => {
            bitpacker.unpack_d1(initial, compressed, &mut new_decompressed, num_bits as u8)
        }
        PackMethod::D1Z => {
            bitpacker.unpack_d1z(initial, compressed, &mut new_decompressed, num_bits as u8)
        }
    };
    assert_eq!(n1, n2);
    assert_eq!(
        decompressed.get(0..block_size).unwrap(),
        new_decompressed.get(0..block_size).unwrap()
    );
    println!("Bytes used: {}", n1);
    println!(
        "Decompresed: {:?}\n",
        new_decompressed.get(0..block_size).unwrap()
    );
}

fn main() {
    let mut my_data: [u32; 256] = [(); 256].map(|_| thread_rng().gen_range(0..20000));
    println!("Orignial: {:?}\n", my_data);

    let mut compressed = [0_u8; 8192];

    let bitpacker4 = BitPacker4x::new();

    test_unpack_helper(&bitpacker4, &my_data, &mut compressed, BitPacker4x::BLOCK_LEN, PackMethod::Vanilla);
    test_unpack_helper(&bitpacker4, &my_data, &mut compressed, BitPacker4x::BLOCK_LEN, PackMethod::M1);
    test_unpack_helper(&bitpacker4, &my_data, &mut compressed, BitPacker4x::BLOCK_LEN, PackMethod::D1Z);

    // For `(un)pack_d1`, the decompressed data must be sorted.
    my_data.sort();

    test_unpack_helper(&bitpacker4, &my_data, &mut compressed, BitPacker4x::BLOCK_LEN, PackMethod::D1);
}

Required Methods

fn pack( &self, decompressed: &[u32], compressed: &mut [u8], num_bits: u8, ) -> usize

fn unpack( &self, compressed: &[u8], decompressed: &mut [u32], num_bits: u8, ) -> usize

fn pack_m1( &self, decompressed: &[u32], compressed: &mut [u8], num_bits: u8, ) -> usize

fn unpack_m1( &self, compressed: &[u8], decompressed: &mut [u32], num_bits: u8, ) -> usize

fn pack_d1( &self, decompressed: &[u32], compressed: &mut [u8], num_bits: u8, ) -> usize

fn unpack_d1( &self, initial: u32, compressed: &[u8], decompressed: &mut [u32], num_bits: u8, ) -> usize

fn pack_d1z( &self, decompressed: &[u32], compressed: &mut [u8], num_bits: u8, ) -> usize

fn unpack_d1z( &self, initial: u32, compressed: &[u8], decompressed: &mut [u32], num_bits: u8, ) -> usize

Implementations on Foreign Types

impl BitPackOps for BitPacker1x

fn pack( &self, decompressed: &[u32], compressed: &mut [u8], num_bits: u8, ) -> usize

fn unpack( &self, compressed: &[u8], decompressed: &mut [u32], num_bits: u8, ) -> usize

fn pack_m1( &self, decompressed: &[u32], compressed: &mut [u8], num_bits: u8, ) -> usize

fn unpack_m1( &self, compressed: &[u8], decompressed: &mut [u32], num_bits: u8, ) -> usize

fn pack_d1( &self, decompressed: &[u32], compressed: &mut [u8], num_bits: u8, ) -> usize

fn unpack_d1( &self, initial: u32, compressed: &[u8], decompressed: &mut [u32], num_bits: u8, ) -> usize

fn pack_d1z( &self, decompressed: &[u32], compressed: &mut [u8], num_bits: u8, ) -> usize

fn unpack_d1z( &self, initial: u32, compressed: &[u8], decompressed: &mut [u32], num_bits: u8, ) -> usize

impl BitPackOps for BitPacker4x

fn pack( &self, decompressed: &[u32], compressed: &mut [u8], num_bits: u8, ) -> usize

fn unpack( &self, compressed: &[u8], decompressed: &mut [u32], num_bits: u8, ) -> usize

fn pack_m1( &self, decompressed: &[u32], compressed: &mut [u8], num_bits: u8, ) -> usize

fn unpack_m1( &self, compressed: &[u8], decompressed: &mut [u32], num_bits: u8, ) -> usize

fn pack_d1( &self, decompressed: &[u32], compressed: &mut [u8], num_bits: u8, ) -> usize

fn unpack_d1( &self, initial: u32, compressed: &[u8], decompressed: &mut [u32], num_bits: u8, ) -> usize

fn pack_d1z( &self, decompressed: &[u32], compressed: &mut [u8], num_bits: u8, ) -> usize

fn unpack_d1z( &self, initial: u32, compressed: &[u8], decompressed: &mut [u32], num_bits: u8, ) -> usize

impl BitPackOps for BitPacker8x

fn pack( &self, decompressed: &[u32], compressed: &mut [u8], num_bits: u8, ) -> usize

fn unpack( &self, compressed: &[u8], decompressed: &mut [u32], num_bits: u8, ) -> usize

fn pack_m1( &self, decompressed: &[u32], compressed: &mut [u8], num_bits: u8, ) -> usize

fn unpack_m1( &self, compressed: &[u8], decompressed: &mut [u32], num_bits: u8, ) -> usize

fn pack_d1( &self, decompressed: &[u32], compressed: &mut [u8], num_bits: u8, ) -> usize

fn unpack_d1( &self, initial: u32, compressed: &[u8], decompressed: &mut [u32], num_bits: u8, ) -> usize

fn pack_d1z( &self, decompressed: &[u32], compressed: &mut [u8], num_bits: u8, ) -> usize

fn unpack_d1z( &self, initial: u32, compressed: &[u8], decompressed: &mut [u32], num_bits: u8, ) -> usize

Implementors