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authorFelix Lange <fjl@twurst.com>2015-01-05 20:30:58 +0800
committerFelix Lange <fjl@twurst.com>2015-01-05 20:45:38 +0800
commitb907a5d76542789e8258c7957981a0ef65fe48d6 (patch)
tree0ea14f3be0b20b91a820343f0c07a8c3467934f7 /cmd
parentb0854fbff5c3d588134f577918a39d08002235dc (diff)
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cmd/rlpdump: new helper command
Diffstat (limited to 'cmd')
-rw-r--r--cmd/rlpdump/main.go128
1 files changed, 128 insertions, 0 deletions
diff --git a/cmd/rlpdump/main.go b/cmd/rlpdump/main.go
new file mode 100644
index 000000000..4fb53369a
--- /dev/null
+++ b/cmd/rlpdump/main.go
@@ -0,0 +1,128 @@
+package main
+
+import (
+ "bufio"
+ "bytes"
+ "encoding/hex"
+ "flag"
+ "fmt"
+ "io"
+ "os"
+ "strings"
+
+ "github.com/ethereum/go-ethereum/rlp"
+)
+
+var (
+ hexMode = flag.String("hex", "", "dump given hex data")
+ noASCII = flag.Bool("noascii", false, "don't print ASCII strings readably")
+)
+
+func init() {
+ flag.Usage = func() {
+ fmt.Fprintln(os.Stderr, "Usage:", os.Args[0], "[-noascii] [-hex <data>] [filename]")
+ 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(*hexMode)
+ 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()
+ r = bufio.NewReader(fd)
+
+ default:
+ fmt.Fprintln(os.Stderr, "Error: too many arguments")
+ flag.Usage()
+ os.Exit(2)
+ }
+
+ s := rlp.NewStream(r)
+ for {
+ if err := dump(s, 0); err != nil {
+ if err != io.EOF {
+ die(err)
+ }
+ break
+ }
+ fmt.Println()
+ }
+}
+
+func dump(s *rlp.Stream, depth int) error {
+ 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.Printf("%s%q", ws(depth), str)
+ } else {
+ fmt.Printf("%s%x", ws(depth), str)
+ }
+ case rlp.List:
+ s.List()
+ defer s.ListEnd()
+ if size == 0 {
+ fmt.Printf(ws(depth) + "[]")
+ return nil
+ } else {
+ fmt.Println(ws(depth) + "[")
+ for i := 0; ; i++ {
+ if i > 0 {
+ fmt.Print(",\n")
+ }
+ if err := dump(s, depth+1); err == rlp.EOL {
+ break
+ } else if err != nil {
+ return err
+ }
+ }
+ fmt.Print(ws(depth) + "]")
+ }
+ }
+ 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)
+}