plugeth/cmd/rlpdump/main.go

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// Copyright 2015 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
// rlpdump is a pretty-printer for RLP data.
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package main
import (
"bufio"
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"bytes"
"container/list"
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"encoding/hex"
"flag"
"fmt"
"io"
"os"
"strings"
"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/rlp"
)
var (
hexMode = flag.String("hex", "", "dump given hex data")
reverseMode = flag.Bool("reverse", false, "convert ASCII to rlp")
noASCII = flag.Bool("noascii", false, "don't print ASCII strings readably")
single = flag.Bool("single", false, "print only the first element, discard the rest")
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)
func init() {
flag.Usage = func() {
fmt.Fprintln(os.Stderr, "Usage:", os.Args[0], "[-noascii] [-hex <data>][-reverse] [filename]")
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flag.PrintDefaults()
fmt.Fprintln(os.Stderr, `
Dumps RLP data from the given file in readable form.
If the filename is omitted, data is read from stdin.`)
}
}
func main() {
flag.Parse()
var r io.Reader
switch {
case *hexMode != "":
data, err := hex.DecodeString(strings.TrimPrefix(*hexMode, "0x"))
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if err != nil {
die(err)
}
r = bytes.NewReader(data)
case flag.NArg() == 0:
r = os.Stdin
case flag.NArg() == 1:
fd, err := os.Open(flag.Arg(0))
if err != nil {
die(err)
}
defer fd.Close()
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r = fd
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default:
fmt.Fprintln(os.Stderr, "Error: too many arguments")
flag.Usage()
os.Exit(2)
}
out := os.Stdout
if *reverseMode {
data, err := textToRlp(r)
if err != nil {
die(err)
}
fmt.Printf("%#x\n", data)
return
} else {
err := rlpToText(r, out)
if err != nil {
die(err)
}
}
}
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func rlpToText(r io.Reader, out io.Writer) error {
s := rlp.NewStream(r, 0)
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for {
if err := dump(s, 0, out); err != nil {
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if err != io.EOF {
return err
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}
break
}
fmt.Fprintln(out)
if *single {
break
}
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}
return nil
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}
func dump(s *rlp.Stream, depth int, out io.Writer) error {
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kind, size, err := s.Kind()
if err != nil {
return err
}
switch kind {
case rlp.Byte, rlp.String:
str, err := s.Bytes()
if err != nil {
return err
}
if len(str) == 0 || !*noASCII && isASCII(str) {
fmt.Fprintf(out, "%s%q", ws(depth), str)
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} else {
fmt.Fprintf(out, "%s%x", ws(depth), str)
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}
case rlp.List:
s.List()
defer s.ListEnd()
if size == 0 {
fmt.Fprintf(out, ws(depth)+"[]")
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} else {
fmt.Fprintln(out, ws(depth)+"[")
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for i := 0; ; i++ {
if i > 0 {
fmt.Fprint(out, ",\n")
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}
if err := dump(s, depth+1, out); err == rlp.EOL {
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break
} else if err != nil {
return err
}
}
fmt.Fprint(out, ws(depth)+"]")
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}
}
return nil
}
func isASCII(b []byte) bool {
for _, c := range b {
if c < 32 || c > 126 {
return false
}
}
return true
}
func ws(n int) string {
return strings.Repeat(" ", n)
}
func die(args ...interface{}) {
fmt.Fprintln(os.Stderr, args...)
os.Exit(1)
}
// textToRlp converts text into RLP (best effort).
func textToRlp(r io.Reader) ([]byte, error) {
// We're expecting the input to be well-formed, meaning that
// - each element is on a separate line
// - each line is either an (element OR a list start/end) + comma
// - an element is either hex-encoded bytes OR a quoted string
var (
scanner = bufio.NewScanner(r)
obj []interface{}
stack = list.New()
)
for scanner.Scan() {
t := strings.TrimSpace(scanner.Text())
if len(t) == 0 {
continue
}
switch t {
case "[": // list start
stack.PushFront(obj)
obj = make([]interface{}, 0)
case "]", "],": // list end
parent := stack.Remove(stack.Front()).([]interface{})
obj = append(parent, obj)
case "[],": // empty list
obj = append(obj, make([]interface{}, 0))
default: // element
data := []byte(t)[:len(t)-1] // cut off comma
if data[0] == '"' { // ascii string
data = []byte(t)[1 : len(data)-1]
} else { // hex data
data = common.FromHex(string(data))
}
obj = append(obj, data)
}
}
if err := scanner.Err(); err != nil {
return nil, err
}
data, err := rlp.EncodeToBytes(obj[0])
return data, err
}