mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
synced 2024-12-22 11:41:19 +00:00
106 lines
2.4 KiB
Go
106 lines
2.4 KiB
Go
/*
|
|
Copyright 2022 Erigon-Lightclient contributors
|
|
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 utils
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"math/bits"
|
|
|
|
"github.com/ledgerwatch/erigon-lib/types/ssz"
|
|
|
|
"github.com/golang/snappy"
|
|
)
|
|
|
|
func Uint32ToBytes4(n uint32) (ret [4]byte) {
|
|
binary.BigEndian.PutUint32(ret[:], n)
|
|
return
|
|
}
|
|
|
|
func Bytes4ToUint32(bytes4 [4]byte) uint32 {
|
|
return binary.BigEndian.Uint32(bytes4[:])
|
|
}
|
|
|
|
func BytesToBytes4(b []byte) (ret [4]byte) {
|
|
copy(ret[:], b)
|
|
return
|
|
}
|
|
|
|
func Uint64ToLE(i uint64) []byte {
|
|
buf := make([]byte, 8)
|
|
binary.LittleEndian.PutUint64(buf, i)
|
|
return buf
|
|
}
|
|
|
|
func DecompressSnappy(data []byte) ([]byte, error) {
|
|
// Decode the snappy
|
|
lenDecoded, err := snappy.DecodedLen(data)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
decodedData := make([]byte, lenDecoded)
|
|
|
|
return snappy.Decode(decodedData, data)
|
|
}
|
|
|
|
func CompressSnappy(data []byte) []byte {
|
|
return snappy.Encode(nil, data)
|
|
}
|
|
|
|
func EncodeSSZSnappy(data ssz.Marshaler) ([]byte, error) {
|
|
var (
|
|
enc = make([]byte, 0, data.EncodingSizeSSZ())
|
|
err error
|
|
)
|
|
enc, err = data.EncodeSSZ(enc)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return snappy.Encode(nil, enc), nil
|
|
}
|
|
|
|
func DecodeSSZSnappy(dst ssz.Unmarshaler, src []byte, version int) error {
|
|
dec, err := snappy.Decode(nil, src)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
err = dst.DecodeSSZ(dec, version)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// getBitlistLength return the amount of bits in given bitlist.
|
|
func GetBitlistLength(b []byte) int {
|
|
if len(b) == 0 {
|
|
return 0
|
|
}
|
|
// The most significant bit is present in the last byte in the array.
|
|
last := b[len(b)-1]
|
|
|
|
// Determine the position of the most significant bit.
|
|
msb := bits.Len8(last)
|
|
if msb == 0 {
|
|
return 0
|
|
}
|
|
|
|
// The absolute position of the most significant bit will be the number of
|
|
// bits in the preceding bytes plus the position of the most significant
|
|
// bit. Subtract this value by 1 to determine the length of the bitlist.
|
|
return 8*(len(b)-1) + msb - 1
|
|
}
|