combine.rs.html -- source

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adler32

aho_corasick

packed

teddy

compile.rs mod.rs runtime.rs

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ahocorasick.rs automaton.rs buffer.rs byte_frequencies.rs classes.rs dfa.rs error.rs lib.rs nfa.rs prefilter.rs state_id.rs

alga

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ascii

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atty

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hex

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internals

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shared

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http

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server

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buffer.rs error.rs lib.rs method.rs net.rs status.rs uri.rs version.rs

idna

lib.rs punycode.rs uts46.rs

itoa

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libc

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align.rs mod.rs

fixed_width_ints.rs lib.rs macros.rs

libm

math

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linked_hash_map

log

lib.rs macros.rs

matches

matrixmultiply

x86

macros.rs mod.rs

aligned_alloc.rs archparam.rs debugmacros.rs dgemm_kernel.rs gemm.rs kernel.rs lib.rs loopmacros.rs sgemm_kernel.rs util.rs

maybe_uninit

md5

consts.rs lib.rs utils.rs

memchr

x86

avx.rs mod.rs sse2.rs

fallback.rs iter.rs lib.rs naive.rs

memoffset

lib.rs offset_of.rs span_of.rs

mime

mime_guess

multipart

server

boundary.rs field.rs mod.rs save.rs

nalgebra

base

geometry

isometry.rs isometry_alga.rs isometry_alias.rs isometry_construction.rs isometry_conversion.rs isometry_ops.rs mod.rs op_macros.rs orthographic.rs perspective.rs point.rs point_alga.rs point_alias.rs point_construction.rs point_conversion.rs point_coordinates.rs point_ops.rs quaternion.rs quaternion_alga.rs quaternion_construction.rs quaternion_conversion.rs quaternion_coordinates.rs quaternion_ops.rs reflection.rs rotation.rs rotation_alga.rs rotation_alias.rs rotation_construction.rs rotation_conversion.rs rotation_ops.rs rotation_specialization.rs similarity.rs similarity_alga.rs similarity_alias.rs similarity_construction.rs similarity_conversion.rs similarity_ops.rs swizzle.rs transform.rs transform_alga.rs transform_alias.rs transform_construction.rs transform_conversion.rs transform_ops.rs translation.rs translation_alga.rs translation_alias.rs translation_construction.rs translation_conversion.rs translation_coordinates.rs translation_ops.rs unit_complex.rs unit_complex_alga.rs unit_complex_construction.rs unit_complex_conversion.rs unit_complex_ops.rs

linalg

balancing.rs bidiagonal.rs cholesky.rs convolution.rs determinant.rs full_piv_lu.rs givens.rs hessenberg.rs householder.rs inverse.rs lu.rs mod.rs permutation_sequence.rs qr.rs schur.rs solve.rs svd.rs symmetric_eigen.rs symmetric_tridiagonal.rs

ndarray

ndarray_linalg

net2

sys

unix

impls.rs mod.rs

ext.rs lib.rs socket.rs tcp.rs udp.rs unix.rs utils.rs

netlib_src

nix

num_complex

cast.rs crand.rs lib.rs pow.rs

num_cpus

lib.rs linux.rs

num_integer

lib.rs roots.rs

num_rational

num_traits

ops

checked.rs inv.rs mod.rs mul_add.rs saturating.rs wrapping.rs

bounds.rs cast.rs float.rs identities.rs int.rs lib.rs macros.rs pow.rs real.rs sign.rs

opaque_debug

percent_encoding

phf

lib.rs map.rs ordered_map.rs ordered_set.rs set.rs

phf_shared

ppv_lite86

x86_64

lib.rs soft.rs types.rs

proc_macro2

detection.rs fallback.rs lib.rs strnom.rs wrapper.rs

quick_error

quote

ext.rs format.rs ident_fragment.rs lib.rs runtime.rs spanned.rs to_tokens.rs

rand

rand_chacha

chacha.rs guts.rs lib.rs

rand_core

block.rs error.rs impls.rs le.rs lib.rs os.rs

rand_distr

binomial.rs cauchy.rs dirichlet.rs exponential.rs gamma.rs lib.rs normal.rs pareto.rs pert.rs poisson.rs triangular.rs unit_ball.rs unit_circle.rs unit_disc.rs unit_sphere.rs utils.rs weibull.rs ziggurat_tables.rs

rawpointer

regex

regex_syntax

remove_dir_all

rosrust

rosrust_codegen

error.rs genmsg.rs helpers.rs lib.rs message_path.rs msg.rs output_layout.rs rosmsg_include.rs

rosrust_msg

rouille

rustc_demangle

legacy.rs lib.rs v0.rs

rustros_tf

lib.rs msg.rs transforms.rs

ryu

buffer

pretty

exponent.rs mantissa.rs mod.rs

common.rs d2s.rs d2s_full_table.rs d2s_intrinsics.rs digit_table.rs f2s.rs lib.rs

safemem

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from_primitive.rs ignored_any.rs impls.rs mod.rs utf8.rs value.rs

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ser

impls.rs impossible.rs mod.rs

export.rs integer128.rs lib.rs macros.rs

serde_bytes

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bound.rs de.rs dummy.rs fragment.rs lib.rs pretend.rs ser.rs try.rs

serde_json

features_check

io

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de.rs from.rs index.rs mod.rs partial_eq.rs ser.rs

de.rs error.rs iter.rs lib.rs macros.rs map.rs number.rs read.rs ser.rs

serde_xml_rs

error.rs lib.rs map.rs seq.rs serialize.rs var.rs

sha1

siphasher

lib.rs sip.rs sip128.rs

smallvec

syn

tempdir

term

terminfo

parser

compiled.rs names.rs

mod.rs parm.rs searcher.rs

thread_local

cached.rs lib.rs thread_id.rs unreachable.rs

threadpool

time

display.rs duration.rs lib.rs parse.rs sys.rs

tiny_http

util

custom_stream.rs equal_reader.rs messages_queue.rs mod.rs refined_tcp_stream.rs sequential.rs task_pool.rs

client.rs common.rs lib.rs request.rs response.rs

traitobject

impls.rs lib.rs

twoway

bmh.rs lib.rs util.rs

typeable

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array.rs bit.rs int.rs lib.rs marker_traits.rs operator_aliases.rs private.rs type_operators.rs uint.rs

ucd_util

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unicase

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unicode_normalization

__test_api.rs decompose.rs lib.rs lookups.rs normalize.rs perfect_hash.rs quick_check.rs recompose.rs stream_safe.rs tables.rs

unicode_xid

lib.rs tables.rs

url

encoding.rs form_urlencoded.rs host.rs lib.rs origin.rs parser.rs path_segments.rs quirks.rs slicing.rs

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char_utf8.rs lib.rs

void

xml

xml_rpc

xmlfmt

de.rs error.rs mod.rs parse.rs ser.rs value.rs

client.rs error.rs lib.rs server.rs

yaml_rust

emitter.rs lib.rs parser.rs scanner.rs yaml.rs

const GF2_DIM: usize = 32;

fn gf2_matrix_times(mat: &[u32; GF2_DIM], mut vec: u32) -> u32 {
    let mut sum = 0;
    let mut idx = 0;
    while vec > 0 {
        if vec & 1 == 1 {
            sum ^= mat[idx];
        }
        vec >>= 1;
        idx += 1;
    }
    return sum;
}

fn gf2_matrix_square(square: &mut [u32; GF2_DIM], mat: &[u32; GF2_DIM]) {
    for n in 0..GF2_DIM {
        square[n] = gf2_matrix_times(mat, mat[n]);
    }
}

pub(crate) fn combine(mut crc1: u32, crc2: u32, mut len2: u64) -> u32 {
    let mut row: u32;
    let mut even = [0u32; GF2_DIM]; /* even-power-of-two zeros operator */
    let mut odd = [0u32; GF2_DIM]; /* odd-power-of-two zeros operator */

    /* degenerate case (also disallow negative lengths) */
    if len2 <= 0 {
        return crc1;
    }

    /* put operator for one zero bit in odd */
    odd[0] = 0xedb88320; /* CRC-32 polynomial */
    row = 1;
    for n in 1..GF2_DIM {
        odd[n] = row;
        row <<= 1;
    }

    /* put operator for two zero bits in even */
    gf2_matrix_square(&mut even, &odd);

    /* put operator for four zero bits in odd */
    gf2_matrix_square(&mut odd, &even);

    /* apply len2 zeros to crc1 (first square will put the operator for one
       zero byte, eight zero bits, in even) */
    loop {
        /* apply zeros operator for this bit of len2 */
        gf2_matrix_square(&mut even, &odd);
        if len2 & 1 == 1 {
            crc1 = gf2_matrix_times(&even, crc1);
        }
        len2 >>= 1;

        /* if no more bits set, then done */
        if len2 == 0 {
            break;
        }

        /* another iteration of the loop with odd and even swapped */
        gf2_matrix_square(&mut odd, &even);
        if len2 & 1 == 1 {
            crc1 = gf2_matrix_times(&odd, crc1);
        }
        len2 >>= 1;

        /* if no more bits set, then done */
        if len2 == 0 {
            break;
        }
    }

    /* return combined crc */
    crc1 ^= crc2;
    return crc1;
}

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