bits.go raw

   1  // Copyright 2018 The gVisor Authors.
   2  //
   3  // Licensed under the Apache License, Version 2.0 (the "License");
   4  // you may not use this file except in compliance with the License.
   5  // You may obtain a copy of the License at
   6  //
   7  //     http://www.apache.org/licenses/LICENSE-2.0
   8  //
   9  // Unless required by applicable law or agreed to in writing, software
  10  // distributed under the License is distributed on an "AS IS" BASIS,
  11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  // See the License for the specific language governing permissions and
  13  // limitations under the License.
  14  
  15  // Package bits includes all bit related types and operations.
  16  package bits
  17  
  18  // AlignUp rounds a length up to an alignment. align must be a power of 2.
  19  func AlignUp(length int, align uint) int {
  20  	return (length + int(align) - 1) & ^(int(align) - 1)
  21  }
  22  
  23  // AlignDown rounds a length down to an alignment. align must be a power of 2.
  24  func AlignDown(length int, align uint) int {
  25  	return length & ^(int(align) - 1)
  26  }
  27