Add PDF XFA browser.

brendandahl · Sep 2, 2021 · 09703e1 · 09703e1
1 parent 83f6bd1
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diff --git a/README.md b/README.md
@@ -5,4 +5,6 @@ PDF Utilities
 
 [browser](http://brendandahl.github.io/pdf.js.utils/browser/) - explore the internal structure and contents of a PDF file
 
+[XFA browser](http://brendandahl.github.io/pdf.js.utils/xfa/) - explore XFA contents of a PDF file
+
 [maker](http://brendandahl.github.io/pdf.js.utils/maker/) - create a minimal PDF using the extracted font of another PDF 
diff --git a/xfa/XmlBeautify.js b/xfa/XmlBeautify.js
diff --git a/xfa/browser.css b/xfa/browser.css
@@ -0,0 +1,10 @@
+#controls {
+	border: 1px solid #ccc;
+	padding: 2px;
+}
+
+pre {
+  margin-top: 0;
+  margin-bottom: 0;
+  border: 1px solid black;
+}
diff --git a/xfa/browser.js b/xfa/browser.js
@@ -0,0 +1,124 @@
+'use strict';
+
+//
+// Helper functions.
+//
+
+String.prototype.repeat = function (num) {
+  return new Array(num + 1).join(this);
+};
+
+function getData(url, callback) {
+  var xhr = new XMLHttpRequest();
+  xhr.open('GET', url, true);
+  xhr.responseType = 'arraybuffer';
+  xhr.onload = (function() {
+    var data = new Uint8Array(xhr.response || xhr.mozResponseArrayBuffer);
+    callback(data);
+  }).bind(this);
+  xhr.send(null);
+}
+
+function parseQueryString(query) {
+  var parts = query.split('&');
+  var params = {};
+  for (var i = 0, ii = parts.length; i < parts.length; ++i) {
+    var param = parts[i].split('=');
+    var key = param[0];
+    var value = param.length > 1 ? param[1] : null;
+    params[decodeURIComponent(key)] = decodeURIComponent(value);
+  }
+  return params;
+}
+
+function stringToURL(typedArray, mimeType) {
+  return URL.createObjectURL(new Blob([typedArray], {type: mimeType}))
+}
+
+function show(key, data, xref, div) {
+  let stream = xref.fetchIfRef(data);
+  let str = stringToUTF8String(bytesToString(stream.getBytes()));
+  let link = document.createElement("a");
+  link.href = stringToURL(str, "application/xml");
+  link.textContent = "(raw)";
+  let pre = document.createElement("pre");
+  pre.textContent = prettifyXml(str);
+  const title = document.createElement("h3");
+  title.textContent = key;
+  div.appendChild(title);
+  div.appendChild(link);
+  div.appendChild(pre);
+}
+
+function createWalker(data, root, div) {
+  var pdf = new PDFDocument(null, data);
+  pdf.parseStartXRef();
+  pdf.parse();
+  let xfa = pdf.acroForm.get("XFA");
+  let xref = pdf.xref;
+  for (let i = 0; i < xfa.length; i += 2) {
+    show(xfa[i], xfa[i + 1], xref, div);
+  }
+}
+
+function prettifyXml(sourceXml) {
+  return new XmlBeautify().beautify(sourceXml);
+}
+
+var Browser = {};
+
+function go(data) {
+  Browser.data = data;
+  var hash = document.location.hash.substring(1);
+  var hashParams = parseQueryString(hash);
+  var root = null;
+  if (hashParams.root) {
+    var split = hashParams.root.split(',');
+    root = { num: split[0], gen: split[1] };
+  }
+  const div = document.getElementById("content");
+  empty(div);
+  var w = createWalker(data, root, div);
+}
+
+function empty(div) {
+  while (div.firstChild) {
+    div.removeChild(div.lastChild);
+  }
+}
+
+window.addEventListener('change', function webViewerChange(evt) {
+  var files = evt.target.files;
+  if (!files || files.length === 0)
+    return;
+
+  // Read the local file into a Uint8Array.
+  var fileReader = new FileReader();
+  fileReader.onload = function webViewerChangeFileReaderOnload(evt) {
+    var main = document.querySelector('#main');
+    if (main) {
+      document.body.removeChild(main);
+    }
+    var buffer = evt.target.result;
+    var uint8Array = new Uint8Array(buffer);
+
+    go(uint8Array);
+  };
+
+  var file = files[0];
+  fileReader.readAsArrayBuffer(file);
+
+}, true);
+
+window.addEventListener('hashchange', function (evt) {
+  go(Browser.data);
+});
+
+var params = parseQueryString(document.location.search.substring(1));
+if (params.file) {
+  getData(params.file, function(data) {
+    go(data);
+  });
+}
+
+
diff --git a/xfa/index.html b/xfa/index.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+  	<title>PDF XFA Browser</title>
+    <meta charset="utf-8">
+    <script type="text/javascript" src="XmlBeautify.js"></script>
+    <script type="text/javascript" src="pdf.js"></script>
+    <script type="text/javascript" src="browser.js"></script>
+    <link rel="stylesheet" href="browser.css"/>
+  </head>
+	<body>
+  	<div id="controls">
+      <input type="file" id="file" name="file"/><br>
+      Special Url Params:<br>
+      ?file=<i>file_url</i> - fetch file by xhr<br>
+    </div>
+    <div id="content">
+    </div>
+	</body>
+<html>
Original file line number	Diff line number	Diff line change
Expand Up		@@ -5,4 +5,6 @@ PDF Utilities

		[browser](http://brendandahl.github.io/pdf.js.utils/browser/) - explore the internal structure and contents of a PDF file

		[XFA browser](http://brendandahl.github.io/pdf.js.utils/xfa/) - explore XFA contents of a PDF file

		[maker](http://brendandahl.github.io/pdf.js.utils/maker/) - create a minimal PDF using the extracted font of another PDF