adding README and torrent file bits

example_loader.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"github.com/vbatts/go-bt/bencode"
+	"github.com/vbatts/go-bt/torrent"
+	"flag"
+	"fmt"
+	"os"
+)
+
+var (
+	flOutput = flag.String("o", "", "output the re-encoded torrent to file at this path")
+)
+
+func main() {
+	flag.Parse()
+
+	if len(*flOutput) > 0 && flag.NArg() > 1 {
+		fmt.Fprintf(os.Stderr, "-o and multiple input files can not be used together")
+		os.Exit(1)
+	}
+
+	for _, arg := range flag.Args() {
+		fh, err := os.Open(arg)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "%s\n", err)
+			continue
+		}
+
+		data, err := bencode.Decode(fh)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "%s\n", err)
+			fh.Close()
+			continue
+		}
+		fh.Close()
+
+		tf, err := torrent.DecocdeTorrentData(data)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "%s\n", err)
+			continue
+		}
+		fmt.Printf("Loaded: %s (%d files)\n", tf.Info.Name, len(tf.Info.Files))
+
+		if len(*flOutput) > 0 {
+			fhOutput, err := os.Create(*flOutput)
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "%s\n", err)
+				continue
+			}
+			err = bencode.Marshal(fhOutput, *tf)
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "%s\n", err)
+			}
+			fmt.Printf("wrote: %s\n", fhOutput.Name())
+			fhOutput.Close()
+		}
+	}
+}