707 lines
22 KiB
JavaScript
707 lines
22 KiB
JavaScript
/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
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'use strict';
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var globalScope = (typeof window === 'undefined') ? this : window;
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var isWorker = (typeof window == 'undefined');
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var ERRORS = 0, WARNINGS = 1, TODOS = 5;
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var verbosity = WARNINGS;
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// The global PDFJS object exposes the API
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// In production, it will be declared outside a global wrapper
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// In development, it will be declared here
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if (!globalScope.PDFJS) {
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globalScope.PDFJS = {};
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}
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// getPdf()
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// Convenience function to perform binary Ajax GET
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// Usage: getPdf('http://...', callback)
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// getPdf({
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// url:String ,
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// [,progress:Function, error:Function]
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// },
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// callback)
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function getPdf(arg, callback) {
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var params = arg;
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if (typeof arg === 'string')
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params = { url: arg };
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var xhr = new XMLHttpRequest();
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xhr.open('GET', params.url);
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xhr.mozResponseType = xhr.responseType = 'arraybuffer';
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xhr.expected = (params.url.indexOf('file:') === 0) ? 0 : 200;
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if ('progress' in params)
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xhr.onprogress = params.progress || undefined;
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if ('error' in params)
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xhr.onerror = params.error || undefined;
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xhr.onreadystatechange = function getPdfOnreadystatechange(e) {
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if (xhr.readyState === 4) {
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if (xhr.status === xhr.expected) {
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var data = (xhr.mozResponseArrayBuffer || xhr.mozResponse ||
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xhr.responseArrayBuffer || xhr.response);
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callback(data);
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} else if (params.error) {
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params.error(e);
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}
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}
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};
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xhr.send(null);
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}
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globalScope.PDFJS.getPdf = getPdf;
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var Page = (function PageClosure() {
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function Page(xref, pageNumber, pageDict, ref) {
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this.pageNumber = pageNumber;
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this.pageDict = pageDict;
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this.stats = {
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create: Date.now(),
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compile: 0.0,
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fonts: 0.0,
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images: 0.0,
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render: 0.0
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};
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this.xref = xref;
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this.ref = ref;
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this.ctx = null;
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this.callback = null;
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}
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Page.prototype = {
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getPageProp: function pageGetPageProp(key) {
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return this.xref.fetchIfRef(this.pageDict.get(key));
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},
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inheritPageProp: function pageInheritPageProp(key) {
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var dict = this.pageDict;
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var obj = dict.get(key);
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while (obj === undefined) {
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dict = this.xref.fetchIfRef(dict.get('Parent'));
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if (!dict)
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break;
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obj = dict.get(key);
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}
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return obj;
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},
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get content() {
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return shadow(this, 'content', this.getPageProp('Contents'));
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},
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get resources() {
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return shadow(this, 'resources', this.inheritPageProp('Resources'));
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},
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get mediaBox() {
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var obj = this.inheritPageProp('MediaBox');
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// Reset invalid media box to letter size.
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if (!isArray(obj) || obj.length !== 4)
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obj = [0, 0, 612, 792];
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return shadow(this, 'mediaBox', obj);
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},
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get view() {
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var obj = this.inheritPageProp('CropBox');
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var view = {
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x: 0,
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y: 0,
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width: this.width,
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height: this.height
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};
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if (isArray(obj) && obj.length == 4) {
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var tl = this.rotatePoint(obj[0], obj[1]);
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var br = this.rotatePoint(obj[2], obj[3]);
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view.x = Math.min(tl.x, br.x);
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view.y = Math.min(tl.y, br.y);
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view.width = Math.abs(tl.x - br.x);
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view.height = Math.abs(tl.y - br.y);
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}
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return shadow(this, 'cropBox', view);
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},
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get annotations() {
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return shadow(this, 'annotations', this.inheritPageProp('Annots'));
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},
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get width() {
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var mediaBox = this.mediaBox;
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var rotate = this.rotate;
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var width;
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if (rotate == 0 || rotate == 180) {
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width = (mediaBox[2] - mediaBox[0]);
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} else {
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width = (mediaBox[3] - mediaBox[1]);
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}
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return shadow(this, 'width', width);
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},
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get height() {
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var mediaBox = this.mediaBox;
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var rotate = this.rotate;
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var height;
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if (rotate == 0 || rotate == 180) {
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height = (mediaBox[3] - mediaBox[1]);
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} else {
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height = (mediaBox[2] - mediaBox[0]);
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}
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return shadow(this, 'height', height);
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},
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get rotate() {
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var rotate = this.inheritPageProp('Rotate') || 0;
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// Normalize rotation so it's a multiple of 90 and between 0 and 270
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if (rotate % 90 != 0) {
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rotate = 0;
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} else if (rotate >= 360) {
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rotate = rotate % 360;
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} else if (rotate < 0) {
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// The spec doesn't cover negatives, assume its counterclockwise
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// rotation. The following is the other implementation of modulo.
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rotate = ((rotate % 360) + 360) % 360;
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}
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return shadow(this, 'rotate', rotate);
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},
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startRenderingFromIRQueue: function pageStartRenderingFromIRQueue(
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IRQueue, fonts) {
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var self = this;
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this.IRQueue = IRQueue;
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var gfx = new CanvasGraphics(this.ctx, this.objs, this.textLayer);
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var displayContinuation = function pageDisplayContinuation() {
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// Always defer call to display() to work around bug in
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// Firefox error reporting from XHR callbacks.
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setTimeout(function pageSetTimeout() {
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try {
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self.display(gfx, self.callback);
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} catch (e) {
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if (self.callback)
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self.callback(e);
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else
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throw e;
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}
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});
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};
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this.ensureFonts(fonts,
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function pageStartRenderingFromIRQueueEnsureFonts() {
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displayContinuation();
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});
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},
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getIRQueue: function pageGetIRQueue(handler, dependency) {
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if (this.IRQueue) {
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// content was compiled
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return this.IRQueue;
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}
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var xref = this.xref;
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var content = xref.fetchIfRef(this.content);
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var resources = xref.fetchIfRef(this.resources);
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if (isArray(content)) {
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// fetching items
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var i, n = content.length;
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for (i = 0; i < n; ++i)
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content[i] = xref.fetchIfRef(content[i]);
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content = new StreamsSequenceStream(content);
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}
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var pe = this.pe = new PartialEvaluator(
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xref, handler, 'p' + this.pageNumber + '_');
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var IRQueue = {};
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return (this.IRQueue = pe.getIRQueue(content, resources, IRQueue,
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dependency));
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},
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ensureFonts: function pageEnsureFonts(fonts, callback) {
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// Convert the font names to the corresponding font obj.
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for (var i = 0, ii = fonts.length; i < ii; i++) {
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fonts[i] = this.objs.objs[fonts[i]].data;
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}
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// Load all the fonts
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var fontObjs = FontLoader.bind(
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fonts,
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function pageEnsureFontsFontObjs(fontObjs) {
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this.stats.fonts = Date.now();
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callback.call(this);
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}.bind(this),
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this.objs
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);
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},
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display: function pageDisplay(gfx, callback) {
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var xref = this.xref;
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var resources = xref.fetchIfRef(this.resources);
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var mediaBox = xref.fetchIfRef(this.mediaBox);
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assertWellFormed(isDict(resources), 'invalid page resources');
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gfx.xref = xref;
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gfx.res = resources;
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gfx.beginDrawing({ x: mediaBox[0], y: mediaBox[1],
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width: this.width,
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height: this.height,
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rotate: this.rotate });
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var startIdx = 0;
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var length = this.IRQueue.fnArray.length;
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var IRQueue = this.IRQueue;
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var self = this;
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function next() {
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startIdx = gfx.executeIRQueue(IRQueue, startIdx, next);
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if (startIdx == length) {
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self.stats.render = Date.now();
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gfx.endDrawing();
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if (callback) callback();
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}
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}
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next();
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},
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rotatePoint: function pageRotatePoint(x, y, reverse) {
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var rotate = reverse ? (360 - this.rotate) : this.rotate;
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switch (rotate) {
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case 180:
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return {x: this.width - x, y: y};
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case 90:
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return {x: this.width - y, y: this.height - x};
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case 270:
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return {x: y, y: x};
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case 360:
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case 0:
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default:
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return {x: x, y: this.height - y};
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}
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},
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getLinks: function pageGetLinks() {
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var xref = this.xref;
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var annotations = xref.fetchIfRef(this.annotations) || [];
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var i, n = annotations.length;
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var links = [];
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for (i = 0; i < n; ++i) {
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var annotation = xref.fetch(annotations[i]);
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if (!isDict(annotation))
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continue;
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var subtype = annotation.get('Subtype');
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if (!isName(subtype) || subtype.name != 'Link')
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continue;
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var rect = annotation.get('Rect');
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var topLeftCorner = this.rotatePoint(rect[0], rect[1]);
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var bottomRightCorner = this.rotatePoint(rect[2], rect[3]);
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var link = {};
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link.x = Math.min(topLeftCorner.x, bottomRightCorner.x);
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link.y = Math.min(topLeftCorner.y, bottomRightCorner.y);
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link.width = Math.abs(topLeftCorner.x - bottomRightCorner.x);
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link.height = Math.abs(topLeftCorner.y - bottomRightCorner.y);
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var a = this.xref.fetchIfRef(annotation.get('A'));
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if (a) {
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switch (a.get('S').name) {
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case 'URI':
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link.url = a.get('URI');
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break;
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case 'GoTo':
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link.dest = a.get('D');
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break;
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default:
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TODO('other link types');
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}
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} else if (annotation.has('Dest')) {
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// simple destination link
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var dest = annotation.get('Dest');
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link.dest = isName(dest) ? dest.name : dest;
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}
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links.push(link);
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}
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return links;
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},
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startRendering: function pageStartRendering(ctx, callback, textLayer) {
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this.ctx = ctx;
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this.callback = callback;
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this.textLayer = textLayer;
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this.startRenderingTime = Date.now();
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this.pdf.startRendering(this);
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}
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};
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return Page;
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})();
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/**
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* The `PDFDocModel` holds all the data of the PDF file. Compared to the
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* `PDFDoc`, this one doesn't have any job management code.
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* Right now there exists one PDFDocModel on the main thread + one object
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* for each worker. If there is no worker support enabled, there are two
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* `PDFDocModel` objects on the main thread created.
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* TODO: Refactor the internal object structure, such that there is no
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* need for the `PDFDocModel` anymore and there is only one object on the
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* main thread and not one entire copy on each worker instance.
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*/
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var PDFDocModel = (function PDFDocModelClosure() {
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function PDFDocModel(arg, callback) {
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if (isStream(arg))
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init.call(this, arg);
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else if (isArrayBuffer(arg))
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init.call(this, new Stream(arg));
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else
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error('PDFDocModel: Unknown argument type');
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}
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function init(stream) {
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assertWellFormed(stream.length > 0, 'stream must have data');
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this.stream = stream;
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this.setup();
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}
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function find(stream, needle, limit, backwards) {
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var pos = stream.pos;
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var end = stream.end;
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var str = '';
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if (pos + limit > end)
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limit = end - pos;
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for (var n = 0; n < limit; ++n)
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str += stream.getChar();
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stream.pos = pos;
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var index = backwards ? str.lastIndexOf(needle) : str.indexOf(needle);
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if (index == -1)
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return false; /* not found */
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stream.pos += index;
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return true; /* found */
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}
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PDFDocModel.prototype = {
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get linearization() {
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var length = this.stream.length;
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var linearization = false;
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if (length) {
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linearization = new Linearization(this.stream);
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if (linearization.length != length)
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linearization = false;
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}
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// shadow the prototype getter with a data property
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return shadow(this, 'linearization', linearization);
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},
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get startXRef() {
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var stream = this.stream;
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var startXRef = 0;
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var linearization = this.linearization;
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if (linearization) {
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// Find end of first obj.
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stream.reset();
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if (find(stream, 'endobj', 1024))
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startXRef = stream.pos + 6;
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} else {
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// Find startxref by jumping backward from the end of the file.
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var step = 1024;
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var found = false, pos = stream.end;
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while (!found && pos > 0) {
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pos -= step - 'startxref'.length;
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if (pos < 0)
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pos = 0;
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stream.pos = pos;
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found = find(stream, 'startxref', step, true);
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}
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if (found) {
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stream.skip(9);
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var ch;
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do {
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ch = stream.getChar();
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} while (Lexer.isSpace(ch));
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var str = '';
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while ((ch - '0') <= 9) {
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str += ch;
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ch = stream.getChar();
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}
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startXRef = parseInt(str, 10);
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if (isNaN(startXRef))
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startXRef = 0;
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}
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}
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// shadow the prototype getter with a data property
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return shadow(this, 'startXRef', startXRef);
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},
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get mainXRefEntriesOffset() {
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var mainXRefEntriesOffset = 0;
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var linearization = this.linearization;
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if (linearization)
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mainXRefEntriesOffset = linearization.mainXRefEntriesOffset;
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// shadow the prototype getter with a data property
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return shadow(this, 'mainXRefEntriesOffset', mainXRefEntriesOffset);
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},
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// Find the header, remove leading garbage and setup the stream
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// starting from the header.
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checkHeader: function pdfDocCheckHeader() {
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var stream = this.stream;
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stream.reset();
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if (find(stream, '%PDF-', 1024)) {
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// Found the header, trim off any garbage before it.
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stream.moveStart();
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return;
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}
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// May not be a PDF file, continue anyway.
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},
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setup: function pdfDocSetup(ownerPassword, userPassword) {
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this.checkHeader();
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this.xref = new XRef(this.stream,
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this.startXRef,
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this.mainXRefEntriesOffset);
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this.catalog = new Catalog(this.xref);
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},
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get numPages() {
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var linearization = this.linearization;
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var num = linearization ? linearization.numPages : this.catalog.numPages;
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// shadow the prototype getter
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return shadow(this, 'numPages', num);
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},
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getPage: function pdfDocGetPage(n) {
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return this.catalog.getPage(n);
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}
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};
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return PDFDocModel;
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})();
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var PDFDoc = (function PDFDocClosure() {
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function PDFDoc(arg, callback) {
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var stream = null;
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var data = null;
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if (isStream(arg)) {
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stream = arg;
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data = arg.bytes;
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} else if (isArrayBuffer(arg)) {
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stream = new Stream(arg);
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data = arg;
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} else {
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error('PDFDoc: Unknown argument type');
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}
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this.data = data;
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this.stream = stream;
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this.pdf = new PDFDocModel(stream);
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this.catalog = this.pdf.catalog;
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this.objs = new PDFObjects();
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this.pageCache = [];
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this.fontsLoading = {};
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this.workerReadyPromise = new Promise('workerReady');
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// If worker support isn't disabled explicit and the browser has worker
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// support, create a new web worker and test if it/the browser fullfills
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// all requirements to run parts of pdf.js in a web worker.
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// Right now, the requirement is, that an Uint8Array is still an Uint8Array
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// as it arrives on the worker. Chrome added this with version 15.
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if (!globalScope.PDFJS.disableWorker && typeof Worker !== 'undefined') {
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var workerSrc = PDFJS.workerSrc;
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if (typeof workerSrc === 'undefined') {
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throw 'No PDFJS.workerSrc specified';
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}
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var worker;
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try {
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worker = new Worker(workerSrc);
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} catch (e) {
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// Some versions of FF can't create a worker on localhost, see:
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// https://bugzilla.mozilla.org/show_bug.cgi?id=683280
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globalScope.PDFJS.disableWorker = true;
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this.setupFakeWorker();
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return;
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}
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var messageHandler = new MessageHandler('main', worker);
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// Tell the worker the file it was created from.
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messageHandler.send('workerSrc', workerSrc);
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messageHandler.on('test', function pdfDocTest(supportTypedArray) {
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if (supportTypedArray) {
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this.worker = worker;
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this.setupMessageHandler(messageHandler);
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} else {
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this.setupFakeWorker();
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}
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}.bind(this));
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var testObj = new Uint8Array(1);
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messageHandler.send('test', testObj);
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} else {
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this.setupFakeWorker();
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}
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}
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PDFDoc.prototype = {
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setupFakeWorker: function() {
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// If we don't use a worker, just post/sendMessage to the main thread.
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var fakeWorker = {
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postMessage: function pdfDocPostMessage(obj) {
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fakeWorker.onmessage({data: obj});
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},
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terminate: function pdfDocTerminate() {}
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};
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var messageHandler = new MessageHandler('main', fakeWorker);
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this.setupMessageHandler(messageHandler);
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// If the main thread is our worker, setup the handling for the messages
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// the main thread sends to it self.
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WorkerMessageHandler.setup(messageHandler);
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},
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setupMessageHandler: function(messageHandler) {
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this.messageHandler = messageHandler;
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messageHandler.on('page', function pdfDocPage(data) {
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var pageNum = data.pageNum;
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var page = this.pageCache[pageNum];
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var depFonts = data.depFonts;
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page.startRenderingFromIRQueue(data.IRQueue, depFonts);
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}, this);
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messageHandler.on('obj', function pdfDocObj(data) {
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var id = data[0];
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var type = data[1];
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switch (type) {
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case 'JpegStream':
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var imageData = data[2];
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loadJpegStream(id, imageData, this.objs);
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break;
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case 'Image':
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var imageData = data[2];
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this.objs.resolve(id, imageData);
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break;
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case 'Font':
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var name = data[2];
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var file = data[3];
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var properties = data[4];
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if (file) {
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// Rewrap the ArrayBuffer in a stream.
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var fontFileDict = new Dict();
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file = new Stream(file, 0, file.length, fontFileDict);
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}
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|
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// For now, resolve the font object here direclty. The real font
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// object is then created in FontLoader.bind().
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this.objs.resolve(id, {
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name: name,
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file: file,
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properties: properties
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});
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break;
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default:
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throw 'Got unkown object type ' + type;
|
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}
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}, this);
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|
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messageHandler.on('font_ready', function pdfDocFontReady(data) {
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var id = data[0];
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var font = new FontShape(data[1]);
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|
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// If there is no string, then there is nothing to attach to the DOM.
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if (!font.str) {
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this.objs.resolve(id, font);
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} else {
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this.objs.setData(id, font);
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}
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}.bind(this));
|
|
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messageHandler.on('page_error', function pdfDocError(data) {
|
|
var page = this.pageCache[data.pageNum];
|
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if (page.callback)
|
|
page.callback(data.error);
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else
|
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throw data.error;
|
|
}, this);
|
|
|
|
messageHandler.on('jpeg_decode', function(data, promise) {
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var imageData = data[0];
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|
var components = data[1];
|
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if (components != 3 && components != 1)
|
|
error('Only 3 component or 1 component can be returned');
|
|
|
|
var img = new Image();
|
|
img.onload = (function jpegImageLoaderOnload() {
|
|
var width = img.width;
|
|
var height = img.height;
|
|
var size = width * height;
|
|
var rgbaLength = size * 4;
|
|
var buf = new Uint8Array(size * components);
|
|
var tmpCanvas = new ScratchCanvas(width, height);
|
|
var tmpCtx = tmpCanvas.getContext('2d');
|
|
tmpCtx.drawImage(img, 0, 0);
|
|
var data = tmpCtx.getImageData(0, 0, width, height).data;
|
|
|
|
if (components == 3) {
|
|
for (var i = 0, j = 0; i < rgbaLength; i += 4, j += 3) {
|
|
buf[j] = data[i];
|
|
buf[j + 1] = data[i + 1];
|
|
buf[j + 2] = data[i + 2];
|
|
}
|
|
} else if (components == 1) {
|
|
for (var i = 0, j = 0; i < rgbaLength; i += 4, j++) {
|
|
buf[j] = data[i];
|
|
}
|
|
}
|
|
promise.resolve({ data: buf, width: width, height: height});
|
|
}).bind(this);
|
|
var src = 'data:image/jpeg;base64,' + window.btoa(imageData);
|
|
img.src = src;
|
|
});
|
|
|
|
setTimeout(function pdfDocFontReadySetTimeout() {
|
|
messageHandler.send('doc', this.data);
|
|
this.workerReadyPromise.resolve(true);
|
|
}.bind(this));
|
|
},
|
|
|
|
get numPages() {
|
|
return this.pdf.numPages;
|
|
},
|
|
|
|
startRendering: function pdfDocStartRendering(page) {
|
|
// The worker might not be ready to receive the page request yet.
|
|
this.workerReadyPromise.then(function pdfDocStartRenderingThen() {
|
|
this.messageHandler.send('page_request', page.pageNumber + 1);
|
|
}.bind(this));
|
|
},
|
|
|
|
getPage: function pdfDocGetPage(n) {
|
|
if (this.pageCache[n])
|
|
return this.pageCache[n];
|
|
|
|
var page = this.pdf.getPage(n);
|
|
// Add a reference to the objects such that Page can forward the reference
|
|
// to the CanvasGraphics and so on.
|
|
page.objs = this.objs;
|
|
page.pdf = this;
|
|
return (this.pageCache[n] = page);
|
|
},
|
|
|
|
destroy: function pdfDocDestroy() {
|
|
if (this.worker)
|
|
this.worker.terminate();
|
|
|
|
if (this.fontWorker)
|
|
this.fontWorker.terminate();
|
|
|
|
for (var n in this.pageCache)
|
|
delete this.pageCache[n];
|
|
|
|
delete this.data;
|
|
delete this.stream;
|
|
delete this.pdf;
|
|
delete this.catalog;
|
|
}
|
|
};
|
|
|
|
return PDFDoc;
|
|
})();
|
|
|
|
globalScope.PDFJS.PDFDoc = PDFDoc;
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|