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* update github.com/alecthomas/chroma v0.8.0 -> v0.8.1 * github.com/blevesearch/bleve v1.0.10 -> v1.0.12 * editorconfig-core-go v2.1.1 -> v2.3.7 * github.com/gliderlabs/ssh v0.2.2 -> v0.3.1 * migrate editorconfig.ParseBytes to Parse * github.com/shurcooL/vfsgen to 0d455de96546 * github.com/go-git/go-git/v5 v5.1.0 -> v5.2.0 * github.com/google/uuid v1.1.1 -> v1.1.2 * github.com/huandu/xstrings v1.3.0 -> v1.3.2 * github.com/klauspost/compress v1.10.11 -> v1.11.1 * github.com/markbates/goth v1.61.2 -> v1.65.0 * github.com/mattn/go-sqlite3 v1.14.0 -> v1.14.4 * github.com/mholt/archiver v3.3.0 -> v3.3.2 * github.com/microcosm-cc/bluemonday 4f7140c49acb -> v1.0.4 * github.com/minio/minio-go v7.0.4 -> v7.0.5 * github.com/olivere/elastic v7.0.9 -> v7.0.20 * github.com/urfave/cli v1.20.0 -> v1.22.4 * github.com/prometheus/client_golang v1.1.0 -> v1.8.0 * github.com/xanzy/go-gitlab v0.37.0 -> v0.38.1 * mvdan.cc/xurls v2.1.0 -> v2.2.0 Co-authored-by: Lauris BH <lauris@nix.lv>
54 lines
1.5 KiB
Go
Vendored
54 lines
1.5 KiB
Go
Vendored
// Copyright 2014-2019 Ulrich Kunitz. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package lzma
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// movebits defines the number of bits used for the updates of probability
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// values.
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const movebits = 5
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// probbits defines the number of bits of a probability value.
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const probbits = 11
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// probInit defines 0.5 as initial value for prob values.
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const probInit prob = 1 << (probbits - 1)
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// Type prob represents probabilities. The type can also be used to encode and
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// decode single bits.
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type prob uint16
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// Dec decreases the probability. The decrease is proportional to the
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// probability value.
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func (p *prob) dec() {
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*p -= *p >> movebits
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}
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// Inc increases the probability. The Increase is proportional to the
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// difference of 1 and the probability value.
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func (p *prob) inc() {
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*p += ((1 << probbits) - *p) >> movebits
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}
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// Computes the new bound for a given range using the probability value.
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func (p prob) bound(r uint32) uint32 {
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return (r >> probbits) * uint32(p)
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}
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// Bits returns 1. One is the number of bits that can be encoded or decoded
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// with a single prob value.
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func (p prob) Bits() int {
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return 1
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}
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// Encode encodes the least-significant bit of v. Note that the p value will be
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// changed.
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func (p *prob) Encode(e *rangeEncoder, v uint32) error {
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return e.EncodeBit(v, p)
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}
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// Decode decodes a single bit. Note that the p value will change.
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func (p *prob) Decode(d *rangeDecoder) (v uint32, err error) {
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return d.DecodeBit(p)
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}
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