tar/asm: try out a go-fuzz test

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

tar/asm/fuzz.go

@@ -0,0 +1,38 @@
+// +build gofuzz
+
+package asm
+
+import (
+	"bytes"
+	"log"
+
+	"github.com/vbatts/tar-split/archive/tar"
+	"github.com/vbatts/tar-split/tar/storage"
+)
+
+func Fuzz(data []byte) int {
+	sp := storage.NewJSONPacker(bytes.NewBuffer([]byte{}))
+	fgp := storage.NewBufferFileGetPutter()
+	tarStream, err := NewInputTarStream(bytes.NewReader(data), sp, fgp)
+	if err != nil {
+		if tarStream != nil {
+			panic("tarStream is != nil on error")
+		}
+		log.Println(err)
+		return 0
+	}
+	rdr := tar.NewReader(tarStream)
+
+	for {
+		hdr, err := rdr.Next()
+		if err != nil {
+			if hdr != nil {
+				panic("hdr is != nil on error")
+			}
+			log.Println(err)
+			return 0
+		}
+		log.Printf("%v", hdr)
+	}
+	return 1
+}