add PDFDoc

pdf.js

@@ -553,42 +553,47 @@ var Linearization = (function () {
     };
 })();
 
-var linearization;
-function getLinearization() {
-    if (linearization)
-	return linearization;
-    return linearization = new Linearization(stream);
-}
-
-function isLinearized() {
-    return stream.length && getLinearization().length == stream.length;
-}
-
-var stream;
+var PDFDoc = (function () {
+    function constructor(arrayBuffer) {
+        this.setup(arrayBuffer);
+    }
 
-// Find the header, remove leading garbage and setup the stream
-// starting from the header.
-function checkHeader(arrayBuffer) {
+    constructor.prototype = {
+        getLinearization: function() {
+            var linearization = this.linearization;
+            if (!linearization)
+                return this.linearization = new Linearization(this.stream);
+            return linearization;
+        },
+        isLinearized: function() {
+            var length = this.stream.length;
+            return length && this.getLinearization().length == length;
+        },
+        // Find the header, remove leading garbage and setup the stream
+        // starting from the header.
+        checkHeader: function(arrayBuffer) {
             const headerSearchSize = 1024;
 
-    stream = new Uint8Array(arrayBuffer);
+            var stream = new Uint8Array(arrayBuffer);
             var skip = 0;
             var header = "%PDF-";
             while (skip < headerSearchSize) {
                 for (var i = 0; i < header.length; ++i)
-            if (stream[skip+i] != header.charCodeAt(i))
+                    if (this.stream[skip+i] != header.charCodeAt(i))
                         break;
                 
                 // Found the header, trim off any garbage before it.
                 if (i == header.length) {
-            stream = new Uint8Array(arrayBuffer, skip);
+                    this.stream = new Uint8Array(arrayBuffer, skip);
                     return;
                 }
             }
 
             // May not be a PDF file, continue anyway.
-}
-
-function setup(arrayBuffer, ownerPassword, userPassword) {
-    var ub = checkHeader(arrayBuffer);
-}
+            this.stream = stream;
+        },
+        setup: function(arrayBuffer, ownerPassword, userPassword) {
+            this.checkHeader(arrayBuffer);
+        }
+    };
+})();