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.
41 lines
1.3 KiB
Go
41 lines
1.3 KiB
Go
// Copyright 2019+ Klaus Post. All rights reserved.
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// License information can be found in the LICENSE file.
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// Based on work by Yann Collet, released under BSD License.
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package zstd
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const (
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prime3bytes = 506832829
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prime4bytes = 2654435761
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prime5bytes = 889523592379
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prime6bytes = 227718039650203
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prime7bytes = 58295818150454627
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prime8bytes = 0xcf1bbcdcb7a56463
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)
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// hashLen returns a hash of the lowest mls bytes of with length output bits.
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// mls must be >=3 and <=8. Any other value will return hash for 4 bytes.
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// length should always be < 32.
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// Preferably length and mls should be a constant for inlining.
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func hashLen(u uint64, length, mls uint8) uint32 {
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switch mls {
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case 3:
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return (uint32(u<<8) * prime3bytes) >> (32 - length)
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case 5:
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return uint32(((u << (64 - 40)) * prime5bytes) >> (64 - length))
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case 6:
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return uint32(((u << (64 - 48)) * prime6bytes) >> (64 - length))
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case 7:
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return uint32(((u << (64 - 56)) * prime7bytes) >> (64 - length))
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case 8:
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return uint32((u * prime8bytes) >> (64 - length))
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default:
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return (uint32(u) * prime4bytes) >> (32 - length)
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}
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}
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// hash3 returns the hash of the lower 3 bytes of u to fit in a hash table with h bits.
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// Preferably h should be a constant and should always be <32.
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func hash3(u uint32, h uint8) uint32 {
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return ((u << (32 - 24)) * prime3bytes) >> ((32 - h) & 31)
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}
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