/* 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" "encoding/hex" ssz "github.com/ferranbt/fastssz" "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 CompressSnappy(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 } func BytesToBytes32(b []byte) (ret [32]byte) { copy(ret[:], b) return } func BytesSliceToBytes32Slice(b [][]byte) (ret [][32]byte) { for _, str := range b { ret = append(ret, BytesToBytes32(str)) } return } func EncodeSSZSnappy(data ssz.Marshaler) ([]byte, error) { enc := make([]byte, data.SizeSSZ()) enc, err := data.MarshalSSZTo(enc[:0]) if err != nil { return nil, err } return snappy.Encode(nil, enc), nil } func DecodeSSZSnappy(dst ssz.Unmarshaler, src []byte) error { dec, err := snappy.Decode(nil, src) if err != nil { return err } err = dst.UnmarshalSSZ(dec) if err != nil { return err } return nil }