Out of memory when Decode is passed certain invalid data

[jakobvarmose]

When the data contains a large string length as in the example below, decodeString tries to allocate all of this memory upfront so the program crashes.

package main

import (
	"bytes"
	"fmt"

	"github.com/jackpal/bencode-go"
)

func main() {
	data := []byte("99999999999:")
	buf := bytes.NewBuffer(data)
	res, err := bencode.Decode(buf)
	fmt.Println(res, err)
}

[xgfone]

I think, it maybe supply an interface to allow the user to set the maximum string length, such as SetMaxStringLength(n int64), and when the length of a string is more than it, return an error.