gvisor/pkg/bits/bits.go

// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Package bits includes all bit related types and operations.
package bits

// AlignUp rounds a length up to an alignment. align must be a power of 2.
func AlignUp(length int, align uint) int {
	return (length + int(align) - 1) & ^(int(align) - 1)
}

// AlignDown rounds a length down to an alignment. align must be a power of 2.
func AlignDown(length int, align uint) int {
	return length & ^(int(align) - 1)
}