erigon-pulse/cmd/lightclient/utils/bytes.go

package utils

import (
	"encoding/binary"
	"encoding/hex"

	"github.com/golang/snappy"
)

func Uint32ToBytes4(n uint32) (ret [4]byte) {
	binary.BigEndian.PutUint32(ret[:], n)
	return
}

func BytesToBytes4(b []byte) (ret [4]byte) {
	copy(ret[:], b)
	return
}

func BytesToHex(b []byte) string {
	return hex.EncodeToString(b)
}

func DecompressSnappy(data []byte) ([]byte, error) {
	// Decode the snappy
	lenDecoded, err := snappy.DecodedLen(data)
	if err != nil {
		return nil, err
	}
	decodedData := make([]byte, lenDecoded)

	snappy.Decode(decodedData, data)
	return decodedData, nil
}

func Uint64ToLE(i uint64) []byte {
	buf := make([]byte, 8)
	binary.LittleEndian.PutUint64(buf, i)
	return buf
}