github.com/zorawar87/trillian@v1.2.1/merkle/common.go (about)

     1  // Copyright 2017 Google Inc. All Rights Reserved.
     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 merkle provides Merkle tree manipulation functions.
    16  package merkle
    17  
    18  // parent returns the index of the parent node in the parent level of the tree.
    19  func parent(leafIndex int64) int64 {
    20  	return leafIndex >> 1
    21  }
    22  
    23  // isRightChild returns true if the node is a right child.
    24  func isRightChild(leafIndex int64) bool {
    25  	return leafIndex&1 == 1
    26  }