148 lines
3.0 KiB
Go
148 lines
3.0 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// go-ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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// rlpdump is a pretty-printer for RLP data.
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package main
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import (
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"bytes"
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"encoding/hex"
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"flag"
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"fmt"
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"io"
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"os"
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"strings"
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"github.com/ethereum/go-ethereum/rlp"
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)
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var (
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hexMode = flag.String("hex", "", "dump given hex data")
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noASCII = flag.Bool("noascii", false, "don't print ASCII strings readably")
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single = flag.Bool("single", false, "print only the first element, discard the rest")
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)
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func init() {
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flag.Usage = func() {
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fmt.Fprintln(os.Stderr, "Usage:", os.Args[0], "[-noascii] [-hex <data>] [filename]")
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flag.PrintDefaults()
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fmt.Fprintln(os.Stderr, `
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Dumps RLP data from the given file in readable form.
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If the filename is omitted, data is read from stdin.`)
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}
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}
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func main() {
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flag.Parse()
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var r io.Reader
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switch {
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case *hexMode != "":
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data, err := hex.DecodeString(strings.TrimPrefix(*hexMode, "0x"))
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if err != nil {
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die(err)
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}
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r = bytes.NewReader(data)
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case flag.NArg() == 0:
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r = os.Stdin
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case flag.NArg() == 1:
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fd, err := os.Open(flag.Arg(0))
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if err != nil {
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die(err)
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}
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defer fd.Close()
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r = fd
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default:
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fmt.Fprintln(os.Stderr, "Error: too many arguments")
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flag.Usage()
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os.Exit(2)
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}
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s := rlp.NewStream(r, 0)
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for {
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if err := dump(s, 0); err != nil {
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if err != io.EOF {
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die(err)
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}
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break
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}
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fmt.Println()
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if *single {
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break
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}
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}
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}
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func dump(s *rlp.Stream, depth int) error {
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kind, size, err := s.Kind()
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if err != nil {
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return err
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}
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switch kind {
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case rlp.Byte, rlp.String:
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str, err := s.Bytes()
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if err != nil {
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return err
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}
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if len(str) == 0 || !*noASCII && isASCII(str) {
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fmt.Printf("%s%q", ws(depth), str)
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} else {
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fmt.Printf("%s%x", ws(depth), str)
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}
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case rlp.List:
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s.List()
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defer s.ListEnd()
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if size == 0 {
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fmt.Print(ws(depth) + "[]")
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} else {
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fmt.Println(ws(depth) + "[")
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for i := 0; ; i++ {
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if i > 0 {
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fmt.Print(",\n")
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}
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if err := dump(s, depth+1); err == rlp.EOL {
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break
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} else if err != nil {
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return err
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}
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}
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fmt.Print(ws(depth) + "]")
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}
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}
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return nil
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}
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func isASCII(b []byte) bool {
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for _, c := range b {
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if c < 32 || c > 126 {
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return false
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}
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}
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return true
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}
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func ws(n int) string {
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return strings.Repeat(" ", n)
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}
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func die(args ...interface{}) {
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fmt.Fprintln(os.Stderr, args...)
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os.Exit(1)
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}
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