github.com/ledgerwatch/erigon-lib@v1.0.0/bptree/felt.go (about)

     1  /*
     2     Copyright 2022 Erigon contributors
     3  
     4     Licensed under the Apache License, Version 2.0 (the "License");
     5     you may not use this file except in compliance with the License.
     6     You may obtain a copy of the License at
     7  
     8         http://www.apache.org/licenses/LICENSE-2.0
     9  
    10     Unless required by applicable law or agreed to in writing, software
    11     distributed under the License is distributed on an "AS IS" BASIS,
    12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13     See the License for the specific language governing permissions and
    14     limitations under the License.
    15  */
    16  
    17  package bptree
    18  
    19  import (
    20  	"crypto/sha256"
    21  	"encoding/binary"
    22  )
    23  
    24  type Felt uint64
    25  
    26  func (v *Felt) Binary() []byte {
    27  	b := make([]byte, 8)
    28  	binary.BigEndian.PutUint64(b, uint64(*v))
    29  	return b
    30  }
    31  
    32  func hash2(bytes1, bytes2 []byte) []byte {
    33  	hashBuilder := sha256.New()
    34  	bytes1Written, _ := hashBuilder.Write(bytes1)
    35  	ensure(bytes1Written == len(bytes1), "hash2: invalid number of bytes1 written")
    36  	bytes2Written, _ := hashBuilder.Write(bytes2)
    37  	ensure(bytes2Written == len(bytes2), "hash2: invalid number of bytes2 written")
    38  	return hashBuilder.Sum(nil)
    39  }
    40  
    41  func deref(pointers []*Felt) []Felt {
    42  	pointees := make([]Felt, 0)
    43  	for _, ptr := range pointers {
    44  		if ptr != nil {
    45  			pointees = append(pointees, *ptr)
    46  		} else {
    47  			break
    48  		}
    49  	}
    50  	return pointees
    51  }