Import bzzhash from bzz-fefe branch

bzz/bzzhash/bzzhash.go

@@ -0,0 +1,28 @@
+// bzzhash
+package main
+
+import (
+	"fmt"
+	"github.com/ethereum/go-ethereum/bzz"
+	"io"
+	"os"
+)
+
+func main() {
+
+	if len(os.Args) < 2 {
+		fmt.Println("Usage: bzzhash <file name>")
+		os.Exit(0)
+	}
+	f, err := os.Open(os.Args[1])
+	if err != nil {
+		fmt.Println("Error opening file " + os.Args[1])
+		os.Exit(1)
+	}
+
+	stat, _ := f.Stat()
+	sr := io.NewSectionReader(f, 0, stat.Size())
+	hash := bzz.GetDPAhash(sr, nil)
+
+	fmt.Printf("%064x\n", hash)
+}