986f076276
Add a new generic container registry client via a new `container` package. Use this to create a command line utility as well as a new upload target for container registries. The code uses the github.com/containers/* project and packages to interact with container registires that is also used by skopeo, podman et al. One if the dependencies is `proglottis/gpgme` that is using cgo to bind libgpgme, so we have to add the corresponding devel package to the BuildRequires as well as installing it on CI. Checks will follow later via an integration test.
47 lines
1.1 KiB
Go
47 lines
1.1 KiB
Go
// Copyright 2014-2021 Ulrich Kunitz. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package lzma
|
|
|
|
/* Naming conventions follows the CodeReviewComments in the Go Wiki. */
|
|
|
|
// ntz32Const is used by the functions NTZ and NLZ.
|
|
const ntz32Const = 0x04d7651f
|
|
|
|
// ntz32Table is a helper table for de Bruijn algorithm by Danny Dubé.
|
|
// See Henry S. Warren, Jr. "Hacker's Delight" section 5-1 figure 5-26.
|
|
var ntz32Table = [32]int8{
|
|
0, 1, 2, 24, 3, 19, 6, 25,
|
|
22, 4, 20, 10, 16, 7, 12, 26,
|
|
31, 23, 18, 5, 21, 9, 15, 11,
|
|
30, 17, 8, 14, 29, 13, 28, 27,
|
|
}
|
|
|
|
/*
|
|
// ntz32 computes the number of trailing zeros for an unsigned 32-bit integer.
|
|
func ntz32(x uint32) int {
|
|
if x == 0 {
|
|
return 32
|
|
}
|
|
x = (x & -x) * ntz32Const
|
|
return int(ntz32Table[x>>27])
|
|
}
|
|
*/
|
|
|
|
// nlz32 computes the number of leading zeros for an unsigned 32-bit integer.
|
|
func nlz32(x uint32) int {
|
|
// Smear left most bit to the right
|
|
x |= x >> 1
|
|
x |= x >> 2
|
|
x |= x >> 4
|
|
x |= x >> 8
|
|
x |= x >> 16
|
|
// Use ntz mechanism to calculate nlz.
|
|
x++
|
|
if x == 0 {
|
|
return 0
|
|
}
|
|
x *= ntz32Const
|
|
return 32 - int(ntz32Table[x>>27])
|
|
}
|