File: lyndon.go

package info (click to toggle)
golang-github-pointlander-compress 1.1.0-5
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 324 kB
  • sloc: makefile: 7
file content (44 lines) | stat: -rw-r--r-- 852 bytes parent folder | download | duplicates (2)
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
// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package compress

type Lyndon struct {
        Words [][]uint8
}

func (l *Lyndon) Factor(s []uint8) {
        k, m, n, words, max := 0, 1, len(s), l.Words[:0], len(s)
	if max > 256 {
		max = 256 + (max - 256) / 2
	}
	if cap(words) < max {
		words = make([][]uint8, 0, max)
	}

        for {
		switch sk, sm := s[k], s[m]; true {
		case sk < sm:
			k, m = 0, m + 1
			if m < n {
				continue
			}
		case sk == sm:
			k, m = k + 1, m + 1
			if m < n {
				continue
			}
			fallthrough
		case sk > sm:
			split := m - k
			k, m, s, words = 0, 1, s[split:], append(words, s[:split])
			n = len(s)
			if n > 1 {
				continue
			}
                }
		break
        }
	l.Words = append(words, s)
}