first commit

build/node_modules/is-zip/index.js

@@ -0,0 +1,16 @@
+'use strict';
+
+/**
+ * Check if a Buffer/Uint8Array is a ZIP file
+ *
+ * @param {Buffer} buf
+ * @api public
+ */
+
+module.exports = function (buf) {
+    if (!buf || buf.length < 4) {
+        return false;
+    }
+
+    return buf[0] === 80 && buf[1] === 75 && (buf[2] === 3 || buf[2] === 5 || buf[2] === 7) && (buf[3] === 4 || buf[3] === 6 || buf[3] === 8);
+};