github.com/n1ghtfa1l/go-vnt@v0.6.4-alpha.6/core/wavm/utils/decode.go (about) 1 // Copyright 2019 The go-vnt Authors 2 // This file is part of the go-vnt library. 3 // 4 // The go-vnt library is free software: you can redistribute it and/or modify 5 // it under the terms of the GNU Lesser General Public License as published by 6 // the Free Software Foundation, either version 3 of the License, or 7 // (at your option) any later version. 8 // 9 // The go-vnt library is distributed in the hope that it will be useful, 10 // but WITHOUT ANY WARRANTY; without even the implied warranty of 11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 // GNU Lesser General Public License for more details. 13 // 14 // You should have received a copy of the GNU Lesser General Public License 15 // along with the go-vnt library. If not, see <http://www.gnu.org/licenses/>. 16 17 package utils 18 19 import ( 20 "bytes" 21 22 "github.com/vntchain/go-vnt/core/vm" 23 "github.com/vntchain/go-vnt/core/wavm/contract" 24 "github.com/vntchain/go-vnt/rlp" 25 ) 26 27 func DecodeContractCode(input []byte) (contract.WasmCode, []byte, error) { 28 magic, _ := ReadMagic(input) 29 if magic != MAGIC { 30 return contract.WasmCode{}, nil, vm.ErrMagicNumberMismatch 31 } 32 input = input[4:] 33 buf := bytes.NewReader(input) 34 cps := []byte{} 35 err := rlp.Decode(buf, &cps) 36 if err != nil { 37 return contract.WasmCode{}, nil, err 38 } 39 decom, err := DeCompress(cps) 40 if err != nil { 41 return contract.WasmCode{}, nil, err 42 } 43 dec := contract.WasmCode{} 44 err = rlp.Decode(bytes.NewReader(decom), &dec) 45 if err != nil { 46 return contract.WasmCode{}, nil, err 47 } 48 return dec, input[int(buf.Size())-buf.Len():], nil 49 }