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make pdfjs

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Artur Adib 2011-10-24 18:13:12 -07:00
parent a7278b7fbc
commit 889de3fc4d
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src/core.js Normal file
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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
'use strict';
var ERRORS = 0, WARNINGS = 1, TODOS = 5;
var verbosity = WARNINGS;
// Set this to true if you want to use workers.
var useWorker = false;
//
// getPdf()
// Convenience function to perform binary Ajax GET
// Usage: getPdf('http://...', callback)
// getPdf({
// url:String ,
// [,progress:Function, error:Function]
// },
// callback)
//
function getPdf(arg, callback) {
var params = arg;
if (typeof arg === 'string')
params = { url: arg };
var xhr = new XMLHttpRequest();
xhr.open('GET', params.url);
xhr.mozResponseType = xhr.responseType = 'arraybuffer';
xhr.expected = (document.URL.indexOf('file:') === 0) ? 0 : 200;
if ('progress' in params)
xhr.onprogress = params.progress || undefined;
if ('error' in params)
xhr.onerror = params.error || undefined;
xhr.onreadystatechange = function getPdfOnreadystatechange() {
if (xhr.readyState === 4 && xhr.status === xhr.expected) {
var data = (xhr.mozResponseArrayBuffer || xhr.mozResponse ||
xhr.responseArrayBuffer || xhr.response);
callback(data);
}
};
xhr.send(null);
}
var Page = (function pagePage() {
function constructor(xref, pageNumber, pageDict, ref) {
this.pageNumber = pageNumber;
this.pageDict = pageDict;
this.stats = {
create: Date.now(),
compile: 0.0,
fonts: 0.0,
images: 0.0,
render: 0.0
};
this.xref = xref;
this.ref = ref;
}
constructor.prototype = {
getPageProp: function pageGetPageProp(key) {
return this.xref.fetchIfRef(this.pageDict.get(key));
},
inheritPageProp: function pageInheritPageProp(key) {
var dict = this.pageDict;
var obj = dict.get(key);
while (obj === undefined) {
dict = this.xref.fetchIfRef(dict.get('Parent'));
if (!dict)
break;
obj = dict.get(key);
}
return obj;
},
get content() {
return shadow(this, 'content', this.getPageProp('Contents'));
},
get resources() {
return shadow(this, 'resources', this.inheritPageProp('Resources'));
},
get mediaBox() {
var obj = this.inheritPageProp('MediaBox');
// Reset invalid media box to letter size.
if (!isArray(obj) || obj.length !== 4)
obj = [0, 0, 612, 792];
return shadow(this, 'mediaBox', obj);
},
get view() {
var obj = this.inheritPageProp('CropBox');
var view = {
x: 0,
y: 0,
width: this.width,
height: this.height
};
if (isArray(obj) && obj.length == 4) {
var tl = this.rotatePoint(obj[0], obj[1]);
var br = this.rotatePoint(obj[2], obj[3]);
view.x = Math.min(tl.x, br.x);
view.y = Math.min(tl.y, br.y);
view.width = Math.abs(tl.x - br.x);
view.height = Math.abs(tl.y - br.y);
}
return shadow(this, 'cropBox', view);
},
get annotations() {
return shadow(this, 'annotations', this.inheritPageProp('Annots'));
},
get width() {
var mediaBox = this.mediaBox;
var rotate = this.rotate;
var width;
if (rotate == 0 || rotate == 180) {
width = (mediaBox[2] - mediaBox[0]);
} else {
width = (mediaBox[3] - mediaBox[1]);
}
return shadow(this, 'width', width);
},
get height() {
var mediaBox = this.mediaBox;
var rotate = this.rotate;
var height;
if (rotate == 0 || rotate == 180) {
height = (mediaBox[3] - mediaBox[1]);
} else {
height = (mediaBox[2] - mediaBox[0]);
}
return shadow(this, 'height', height);
},
get rotate() {
var rotate = this.inheritPageProp('Rotate') || 0;
// Normalize rotation so it's a multiple of 90 and between 0 and 270
if (rotate % 90 != 0) {
rotate = 0;
} else if (rotate >= 360) {
rotate = rotate % 360;
} else if (rotate < 0) {
// The spec doesn't cover negatives, assume its counterclockwise
// rotation. The following is the other implementation of modulo.
rotate = ((rotate % 360) + 360) % 360;
}
return shadow(this, 'rotate', rotate);
},
startRenderingFromIRQueue: function startRenderingFromIRQueue(
IRQueue, fonts) {
var self = this;
this.IRQueue = IRQueue;
var gfx = new CanvasGraphics(this.ctx, this.objs);
var startTime = Date.now();
var displayContinuation = function pageDisplayContinuation() {
// Always defer call to display() to work around bug in
// Firefox error reporting from XHR callbacks.
setTimeout(function pageSetTimeout() {
try {
self.display(gfx, self.callback);
} catch (e) {
if (self.callback) self.callback(e.toString());
throw e;
}
});
};
this.ensureFonts(fonts, function() {
displayContinuation();
});
},
getIRQueue: function(handler, dependency) {
if (this.IRQueue) {
// content was compiled
return this.IRQueue;
}
var xref = this.xref;
var content = xref.fetchIfRef(this.content);
var resources = xref.fetchIfRef(this.resources);
if (isArray(content)) {
// fetching items
var i, n = content.length;
for (i = 0; i < n; ++i)
content[i] = xref.fetchIfRef(content[i]);
content = new StreamsSequenceStream(content);
}
var pe = this.pe = new PartialEvaluator(
xref, handler, 'p' + this.pageNumber + '_');
var IRQueue = {};
return this.IRQueue = pe.getIRQueue(
content, resources, IRQueue, dependency);
},
ensureFonts: function(fonts, callback) {
// Convert the font names to the corresponding font obj.
for (var i = 0; i < fonts.length; i++) {
fonts[i] = this.objs.objs[fonts[i]].data;
}
// Load all the fonts
var fontObjs = FontLoader.bind(
fonts,
function(fontObjs) {
this.stats.fonts = Date.now();
callback.call(this);
}.bind(this),
this.objs
);
},
display: function(gfx, callback) {
var xref = this.xref;
var resources = xref.fetchIfRef(this.resources);
var mediaBox = xref.fetchIfRef(this.mediaBox);
assertWellFormed(isDict(resources), 'invalid page resources');
gfx.xref = xref;
gfx.res = resources;
gfx.beginDrawing({ x: mediaBox[0], y: mediaBox[1],
width: this.width,
height: this.height,
rotate: this.rotate });
var startIdx = 0;
var length = this.IRQueue.fnArray.length;
var IRQueue = this.IRQueue;
var self = this;
var startTime = Date.now();
function next() {
startIdx = gfx.executeIRQueue(IRQueue, startIdx, next);
if (startIdx == length) {
self.stats.render = Date.now();
if (callback) callback();
}
}
next();
},
rotatePoint: function pageRotatePoint(x, y, reverse) {
var rotate = reverse ? (360 - this.rotate) : this.rotate;
switch (rotate) {
case 180:
return {x: this.width - x, y: y};
case 90:
return {x: this.width - y, y: this.height - x};
case 270:
return {x: y, y: x};
case 360:
case 0:
default:
return {x: x, y: this.height - y};
}
},
getLinks: function pageGetLinks() {
var xref = this.xref;
var annotations = xref.fetchIfRef(this.annotations) || [];
var i, n = annotations.length;
var links = [];
for (i = 0; i < n; ++i) {
var annotation = xref.fetch(annotations[i]);
if (!isDict(annotation))
continue;
var subtype = annotation.get('Subtype');
if (!isName(subtype) || subtype.name != 'Link')
continue;
var rect = annotation.get('Rect');
var topLeftCorner = this.rotatePoint(rect[0], rect[1]);
var bottomRightCorner = this.rotatePoint(rect[2], rect[3]);
var link = {};
link.x = Math.min(topLeftCorner.x, bottomRightCorner.x);
link.y = Math.min(topLeftCorner.y, bottomRightCorner.y);
link.width = Math.abs(topLeftCorner.x - bottomRightCorner.x);
link.height = Math.abs(topLeftCorner.y - bottomRightCorner.y);
var a = this.xref.fetchIfRef(annotation.get('A'));
if (a) {
switch (a.get('S').name) {
case 'URI':
link.url = a.get('URI');
break;
case 'GoTo':
link.dest = a.get('D');
break;
default:
TODO('other link types');
}
} else if (annotation.has('Dest')) {
// simple destination link
var dest = annotation.get('Dest');
link.dest = isName(dest) ? dest.name : dest;
}
links.push(link);
}
return links;
},
startRendering: function(ctx, callback) {
this.ctx = ctx;
this.callback = callback;
this.startRenderingTime = Date.now();
this.pdf.startRendering(this);
}
};
return constructor;
})();
/**
* The `PDFDocModel` holds all the data of the PDF file. Compared to the
* `PDFDoc`, this one doesn't have any job management code.
* Right now there exists one PDFDocModel on the main thread + one object
* for each worker. If there is no worker support enabled, there are two
* `PDFDocModel` objects on the main thread created.
* TODO: Refactor the internal object structure, such that there is no
* need for the `PDFDocModel` anymore and there is only one object on the
* main thread and not one entire copy on each worker instance.
*/
var PDFDocModel = (function pdfDoc() {
function constructor(arg, callback) {
if (isStream(arg))
init.call(this, arg);
else if (isArrayBuffer(arg))
init.call(this, new Stream(arg));
else
error('PDFDocModel: Unknown argument type');
}
function init(stream) {
assertWellFormed(stream.length > 0, 'stream must have data');
this.stream = stream;
this.setup();
}
function find(stream, needle, limit, backwards) {
var pos = stream.pos;
var end = stream.end;
var str = '';
if (pos + limit > end)
limit = end - pos;
for (var n = 0; n < limit; ++n)
str += stream.getChar();
stream.pos = pos;
var index = backwards ? str.lastIndexOf(needle) : str.indexOf(needle);
if (index == -1)
return false; /* not found */
stream.pos += index;
return true; /* found */
}
constructor.prototype = {
get linearization() {
var length = this.stream.length;
var linearization = false;
if (length) {
linearization = new Linearization(this.stream);
if (linearization.length != length)
linearization = false;
}
// shadow the prototype getter with a data property
return shadow(this, 'linearization', linearization);
},
get startXRef() {
var stream = this.stream;
var startXRef = 0;
var linearization = this.linearization;
if (linearization) {
// Find end of first obj.
stream.reset();
if (find(stream, 'endobj', 1024))
startXRef = stream.pos + 6;
} else {
// Find startxref at the end of the file.
var start = stream.end - 1024;
if (start < 0)
start = 0;
stream.pos = start;
if (find(stream, 'startxref', 1024, true)) {
stream.skip(9);
var ch;
do {
ch = stream.getChar();
} while (Lexer.isSpace(ch));
var str = '';
while ((ch - '0') <= 9) {
str += ch;
ch = stream.getChar();
}
startXRef = parseInt(str, 10);
if (isNaN(startXRef))
startXRef = 0;
}
}
// shadow the prototype getter with a data property
return shadow(this, 'startXRef', startXRef);
},
get mainXRefEntriesOffset() {
var mainXRefEntriesOffset = 0;
var linearization = this.linearization;
if (linearization)
mainXRefEntriesOffset = linearization.mainXRefEntriesOffset;
// shadow the prototype getter with a data property
return shadow(this, 'mainXRefEntriesOffset', mainXRefEntriesOffset);
},
// Find the header, remove leading garbage and setup the stream
// starting from the header.
checkHeader: function pdfDocCheckHeader() {
var stream = this.stream;
stream.reset();
if (find(stream, '%PDF-', 1024)) {
// Found the header, trim off any garbage before it.
stream.moveStart();
return;
}
// May not be a PDF file, continue anyway.
},
setup: function pdfDocSetup(ownerPassword, userPassword) {
this.checkHeader();
this.xref = new XRef(this.stream,
this.startXRef,
this.mainXRefEntriesOffset);
this.catalog = new Catalog(this.xref);
},
get numPages() {
var linearization = this.linearization;
var num = linearization ? linearization.numPages : this.catalog.numPages;
// shadow the prototype getter
return shadow(this, 'numPages', num);
},
getPage: function pdfDocGetPage(n) {
return this.catalog.getPage(n);
}
};
return constructor;
})();
var PDFDoc = (function() {
function constructor(arg, callback) {
var stream = null;
var data = null;
if (isStream(arg)) {
stream = arg;
data = arg.bytes;
} else if (isArrayBuffer(arg)) {
stream = new Stream(arg);
data = arg;
} else {
error('PDFDoc: Unknown argument type');
}
this.data = data;
this.stream = stream;
this.pdf = new PDFDocModel(stream);
this.catalog = this.pdf.catalog;
this.objs = new PDFObjects();
this.pageCache = [];
if (useWorker) {
var worker = new Worker('../worker/pdf_worker_loader.js');
} else {
// If we don't use a worker, just post/sendMessage to the main thread.
var worker = {
postMessage: function(obj) {
worker.onmessage({data: obj});
},
terminate: function() {}
};
}
this.worker = worker;
this.fontsLoading = {};
var processorHandler = this.processorHandler =
new MessageHandler('main', worker);
processorHandler.on('page', function(data) {
var pageNum = data.pageNum;
var page = this.pageCache[pageNum];
var depFonts = data.depFonts;
page.startRenderingFromIRQueue(data.IRQueue, depFonts);
}, this);
processorHandler.on('obj', function(data) {
var id = data[0];
var type = data[1];
switch (type) {
case 'JpegStream':
var IR = data[2];
new JpegImage(id, IR, this.objs);
break;
case 'Font':
var name = data[2];
var file = data[3];
var properties = data[4];
if (file) {
var fontFileDict = new Dict();
fontFileDict.map = file.dict.map;
var fontFile = new Stream(file.bytes, file.start,
file.end - file.start, fontFileDict);
// Check if this is a FlateStream. Otherwise just use the created
// Stream one. This makes complex_ttf_font.pdf work.
var cmf = file.bytes[0];
if ((cmf & 0x0f) == 0x08) {
file = new FlateStream(fontFile);
} else {
file = fontFile;
}
}
// For now, resolve the font object here direclty. The real font
// object is then created in FontLoader.bind().
this.objs.resolve(id, {
name: name,
file: file,
properties: properties
});
break;
default:
throw 'Got unkown object type ' + type;
}
}, this);
processorHandler.on('font_ready', function(data) {
var id = data[0];
var font = new FontShape(data[1]);
// If there is no string, then there is nothing to attach to the DOM.
if (!font.str) {
this.objs.resolve(id, font);
} else {
this.objs.setData(id, font);
}
}.bind(this));
if (!useWorker) {
// If the main thread is our worker, setup the handling for the messages
// the main thread sends to it self.
WorkerProcessorHandler.setup(processorHandler);
}
this.workerReadyPromise = new Promise('workerReady');
setTimeout(function() {
processorHandler.send('doc', this.data);
this.workerReadyPromise.resolve(true);
}.bind(this));
}
constructor.prototype = {
get numPages() {
return this.pdf.numPages;
},
startRendering: function(page) {
// The worker might not be ready to receive the page request yet.
this.workerReadyPromise.then(function() {
this.processorHandler.send('page_request', page.pageNumber + 1);
}.bind(this));
},
getPage: function(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() {
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 constructor;
})();

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src/pdf.js
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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
'use strict';
// // TODO: Global namespace
// var PDF = {};
var ERRORS = 0, WARNINGS = 1, TODOS = 5;
var verbosity = WARNINGS;
// Stay away from global
(function(){
// Set this to true if you want to use workers.
var useWorker = false;
'use strict';
//
// getPdf()
// Convenience function to perform binary Ajax GET
// Usage: getPdf('http://...', callback)
// getPdf({
// url:String ,
// [,progress:Function, error:Function]
// },
// callback)
//
function getPdf(arg, callback) {
var params = arg;
if (typeof arg === 'string')
params = { url: arg };
// All files will be inserted below this point
// INSERT_POINT
var xhr = new XMLHttpRequest();
xhr.open('GET', params.url);
xhr.mozResponseType = xhr.responseType = 'arraybuffer';
xhr.expected = (document.URL.indexOf('file:') === 0) ? 0 : 200;
//
// Expose API in global object
//
window.PDFDoc = PDFDoc;
window.getPdf = getPdf;
if ('progress' in params)
xhr.onprogress = params.progress || undefined;
if ('error' in params)
xhr.onerror = params.error || undefined;
xhr.onreadystatechange = function getPdfOnreadystatechange() {
if (xhr.readyState === 4 && xhr.status === xhr.expected) {
var data = (xhr.mozResponseArrayBuffer || xhr.mozResponse ||
xhr.responseArrayBuffer || xhr.response);
callback(data);
}
};
xhr.send(null);
}
var Page = (function pagePage() {
function constructor(xref, pageNumber, pageDict, ref) {
this.pageNumber = pageNumber;
this.pageDict = pageDict;
this.stats = {
create: Date.now(),
compile: 0.0,
fonts: 0.0,
images: 0.0,
render: 0.0
};
this.xref = xref;
this.ref = ref;
}
constructor.prototype = {
getPageProp: function pageGetPageProp(key) {
return this.xref.fetchIfRef(this.pageDict.get(key));
},
inheritPageProp: function pageInheritPageProp(key) {
var dict = this.pageDict;
var obj = dict.get(key);
while (obj === undefined) {
dict = this.xref.fetchIfRef(dict.get('Parent'));
if (!dict)
break;
obj = dict.get(key);
}
return obj;
},
get content() {
return shadow(this, 'content', this.getPageProp('Contents'));
},
get resources() {
return shadow(this, 'resources', this.inheritPageProp('Resources'));
},
get mediaBox() {
var obj = this.inheritPageProp('MediaBox');
// Reset invalid media box to letter size.
if (!isArray(obj) || obj.length !== 4)
obj = [0, 0, 612, 792];
return shadow(this, 'mediaBox', obj);
},
get view() {
var obj = this.inheritPageProp('CropBox');
var view = {
x: 0,
y: 0,
width: this.width,
height: this.height
};
if (isArray(obj) && obj.length == 4) {
var tl = this.rotatePoint(obj[0], obj[1]);
var br = this.rotatePoint(obj[2], obj[3]);
view.x = Math.min(tl.x, br.x);
view.y = Math.min(tl.y, br.y);
view.width = Math.abs(tl.x - br.x);
view.height = Math.abs(tl.y - br.y);
}
return shadow(this, 'cropBox', view);
},
get annotations() {
return shadow(this, 'annotations', this.inheritPageProp('Annots'));
},
get width() {
var mediaBox = this.mediaBox;
var rotate = this.rotate;
var width;
if (rotate == 0 || rotate == 180) {
width = (mediaBox[2] - mediaBox[0]);
} else {
width = (mediaBox[3] - mediaBox[1]);
}
return shadow(this, 'width', width);
},
get height() {
var mediaBox = this.mediaBox;
var rotate = this.rotate;
var height;
if (rotate == 0 || rotate == 180) {
height = (mediaBox[3] - mediaBox[1]);
} else {
height = (mediaBox[2] - mediaBox[0]);
}
return shadow(this, 'height', height);
},
get rotate() {
var rotate = this.inheritPageProp('Rotate') || 0;
// Normalize rotation so it's a multiple of 90 and between 0 and 270
if (rotate % 90 != 0) {
rotate = 0;
} else if (rotate >= 360) {
rotate = rotate % 360;
} else if (rotate < 0) {
// The spec doesn't cover negatives, assume its counterclockwise
// rotation. The following is the other implementation of modulo.
rotate = ((rotate % 360) + 360) % 360;
}
return shadow(this, 'rotate', rotate);
},
startRenderingFromIRQueue: function startRenderingFromIRQueue(
IRQueue, fonts) {
var self = this;
this.IRQueue = IRQueue;
var gfx = new CanvasGraphics(this.ctx, this.objs);
var startTime = Date.now();
var displayContinuation = function pageDisplayContinuation() {
// Always defer call to display() to work around bug in
// Firefox error reporting from XHR callbacks.
setTimeout(function pageSetTimeout() {
try {
self.display(gfx, self.callback);
} catch (e) {
if (self.callback) self.callback(e.toString());
throw e;
}
});
};
this.ensureFonts(fonts, function() {
displayContinuation();
});
},
getIRQueue: function(handler, dependency) {
if (this.IRQueue) {
// content was compiled
return this.IRQueue;
}
var xref = this.xref;
var content = xref.fetchIfRef(this.content);
var resources = xref.fetchIfRef(this.resources);
if (isArray(content)) {
// fetching items
var i, n = content.length;
for (i = 0; i < n; ++i)
content[i] = xref.fetchIfRef(content[i]);
content = new StreamsSequenceStream(content);
}
var pe = this.pe = new PartialEvaluator(
xref, handler, 'p' + this.pageNumber + '_');
var IRQueue = {};
return this.IRQueue = pe.getIRQueue(
content, resources, IRQueue, dependency);
},
ensureFonts: function(fonts, callback) {
// Convert the font names to the corresponding font obj.
for (var i = 0; i < fonts.length; i++) {
fonts[i] = this.objs.objs[fonts[i]].data;
}
// Load all the fonts
var fontObjs = FontLoader.bind(
fonts,
function(fontObjs) {
this.stats.fonts = Date.now();
callback.call(this);
}.bind(this),
this.objs
);
},
display: function(gfx, callback) {
var xref = this.xref;
var resources = xref.fetchIfRef(this.resources);
var mediaBox = xref.fetchIfRef(this.mediaBox);
assertWellFormed(isDict(resources), 'invalid page resources');
gfx.xref = xref;
gfx.res = resources;
gfx.beginDrawing({ x: mediaBox[0], y: mediaBox[1],
width: this.width,
height: this.height,
rotate: this.rotate });
var startIdx = 0;
var length = this.IRQueue.fnArray.length;
var IRQueue = this.IRQueue;
var self = this;
var startTime = Date.now();
function next() {
startIdx = gfx.executeIRQueue(IRQueue, startIdx, next);
if (startIdx == length) {
self.stats.render = Date.now();
if (callback) callback();
}
}
next();
},
rotatePoint: function pageRotatePoint(x, y, reverse) {
var rotate = reverse ? (360 - this.rotate) : this.rotate;
switch (rotate) {
case 180:
return {x: this.width - x, y: y};
case 90:
return {x: this.width - y, y: this.height - x};
case 270:
return {x: y, y: x};
case 360:
case 0:
default:
return {x: x, y: this.height - y};
}
},
getLinks: function pageGetLinks() {
var xref = this.xref;
var annotations = xref.fetchIfRef(this.annotations) || [];
var i, n = annotations.length;
var links = [];
for (i = 0; i < n; ++i) {
var annotation = xref.fetch(annotations[i]);
if (!isDict(annotation))
continue;
var subtype = annotation.get('Subtype');
if (!isName(subtype) || subtype.name != 'Link')
continue;
var rect = annotation.get('Rect');
var topLeftCorner = this.rotatePoint(rect[0], rect[1]);
var bottomRightCorner = this.rotatePoint(rect[2], rect[3]);
var link = {};
link.x = Math.min(topLeftCorner.x, bottomRightCorner.x);
link.y = Math.min(topLeftCorner.y, bottomRightCorner.y);
link.width = Math.abs(topLeftCorner.x - bottomRightCorner.x);
link.height = Math.abs(topLeftCorner.y - bottomRightCorner.y);
var a = this.xref.fetchIfRef(annotation.get('A'));
if (a) {
switch (a.get('S').name) {
case 'URI':
link.url = a.get('URI');
break;
case 'GoTo':
link.dest = a.get('D');
break;
default:
TODO('other link types');
}
} else if (annotation.has('Dest')) {
// simple destination link
var dest = annotation.get('Dest');
link.dest = isName(dest) ? dest.name : dest;
}
links.push(link);
}
return links;
},
startRendering: function(ctx, callback) {
this.ctx = ctx;
this.callback = callback;
this.startRenderingTime = Date.now();
this.pdf.startRendering(this);
}
};
return constructor;
})();
/**
* The `PDFDocModel` holds all the data of the PDF file. Compared to the
* `PDFDoc`, this one doesn't have any job management code.
* Right now there exists one PDFDocModel on the main thread + one object
* for each worker. If there is no worker support enabled, there are two
* `PDFDocModel` objects on the main thread created.
* TODO: Refactor the internal object structure, such that there is no
* need for the `PDFDocModel` anymore and there is only one object on the
* main thread and not one entire copy on each worker instance.
*/
var PDFDocModel = (function pdfDoc() {
function constructor(arg, callback) {
if (isStream(arg))
init.call(this, arg);
else if (isArrayBuffer(arg))
init.call(this, new Stream(arg));
else
error('PDFDocModel: Unknown argument type');
}
function init(stream) {
assertWellFormed(stream.length > 0, 'stream must have data');
this.stream = stream;
this.setup();
}
function find(stream, needle, limit, backwards) {
var pos = stream.pos;
var end = stream.end;
var str = '';
if (pos + limit > end)
limit = end - pos;
for (var n = 0; n < limit; ++n)
str += stream.getChar();
stream.pos = pos;
var index = backwards ? str.lastIndexOf(needle) : str.indexOf(needle);
if (index == -1)
return false; /* not found */
stream.pos += index;
return true; /* found */
}
constructor.prototype = {
get linearization() {
var length = this.stream.length;
var linearization = false;
if (length) {
linearization = new Linearization(this.stream);
if (linearization.length != length)
linearization = false;
}
// shadow the prototype getter with a data property
return shadow(this, 'linearization', linearization);
},
get startXRef() {
var stream = this.stream;
var startXRef = 0;
var linearization = this.linearization;
if (linearization) {
// Find end of first obj.
stream.reset();
if (find(stream, 'endobj', 1024))
startXRef = stream.pos + 6;
} else {
// Find startxref at the end of the file.
var start = stream.end - 1024;
if (start < 0)
start = 0;
stream.pos = start;
if (find(stream, 'startxref', 1024, true)) {
stream.skip(9);
var ch;
do {
ch = stream.getChar();
} while (Lexer.isSpace(ch));
var str = '';
while ((ch - '0') <= 9) {
str += ch;
ch = stream.getChar();
}
startXRef = parseInt(str, 10);
if (isNaN(startXRef))
startXRef = 0;
}
}
// shadow the prototype getter with a data property
return shadow(this, 'startXRef', startXRef);
},
get mainXRefEntriesOffset() {
var mainXRefEntriesOffset = 0;
var linearization = this.linearization;
if (linearization)
mainXRefEntriesOffset = linearization.mainXRefEntriesOffset;
// shadow the prototype getter with a data property
return shadow(this, 'mainXRefEntriesOffset', mainXRefEntriesOffset);
},
// Find the header, remove leading garbage and setup the stream
// starting from the header.
checkHeader: function pdfDocCheckHeader() {
var stream = this.stream;
stream.reset();
if (find(stream, '%PDF-', 1024)) {
// Found the header, trim off any garbage before it.
stream.moveStart();
return;
}
// May not be a PDF file, continue anyway.
},
setup: function pdfDocSetup(ownerPassword, userPassword) {
this.checkHeader();
this.xref = new XRef(this.stream,
this.startXRef,
this.mainXRefEntriesOffset);
this.catalog = new Catalog(this.xref);
},
get numPages() {
var linearization = this.linearization;
var num = linearization ? linearization.numPages : this.catalog.numPages;
// shadow the prototype getter
return shadow(this, 'numPages', num);
},
getPage: function pdfDocGetPage(n) {
return this.catalog.getPage(n);
}
};
return constructor;
})();
var PDFDoc = (function() {
function constructor(arg, callback) {
var stream = null;
var data = null;
if (isStream(arg)) {
stream = arg;
data = arg.bytes;
} else if (isArrayBuffer(arg)) {
stream = new Stream(arg);
data = arg;
} else {
error('PDFDoc: Unknown argument type');
}
this.data = data;
this.stream = stream;
this.pdf = new PDFDocModel(stream);
this.catalog = this.pdf.catalog;
this.objs = new PDFObjects();
this.pageCache = [];
if (useWorker) {
var worker = new Worker('../worker/pdf_worker_loader.js');
} else {
// If we don't use a worker, just post/sendMessage to the main thread.
var worker = {
postMessage: function(obj) {
worker.onmessage({data: obj});
},
terminate: function() {}
};
}
this.worker = worker;
this.fontsLoading = {};
var processorHandler = this.processorHandler =
new MessageHandler('main', worker);
processorHandler.on('page', function(data) {
var pageNum = data.pageNum;
var page = this.pageCache[pageNum];
var depFonts = data.depFonts;
page.startRenderingFromIRQueue(data.IRQueue, depFonts);
}, this);
processorHandler.on('obj', function(data) {
var id = data[0];
var type = data[1];
switch (type) {
case 'JpegStream':
var IR = data[2];
new JpegImage(id, IR, this.objs);
break;
case 'Font':
var name = data[2];
var file = data[3];
var properties = data[4];
if (file) {
var fontFileDict = new Dict();
fontFileDict.map = file.dict.map;
var fontFile = new Stream(file.bytes, file.start,
file.end - file.start, fontFileDict);
// Check if this is a FlateStream. Otherwise just use the created
// Stream one. This makes complex_ttf_font.pdf work.
var cmf = file.bytes[0];
if ((cmf & 0x0f) == 0x08) {
file = new FlateStream(fontFile);
} else {
file = fontFile;
}
}
// For now, resolve the font object here direclty. The real font
// object is then created in FontLoader.bind().
this.objs.resolve(id, {
name: name,
file: file,
properties: properties
});
break;
default:
throw 'Got unkown object type ' + type;
}
}, this);
processorHandler.on('font_ready', function(data) {
var id = data[0];
var font = new FontShape(data[1]);
// If there is no string, then there is nothing to attach to the DOM.
if (!font.str) {
this.objs.resolve(id, font);
} else {
this.objs.setData(id, font);
}
}.bind(this));
if (!useWorker) {
// If the main thread is our worker, setup the handling for the messages
// the main thread sends to it self.
WorkerProcessorHandler.setup(processorHandler);
}
this.workerReadyPromise = new Promise('workerReady');
setTimeout(function() {
processorHandler.send('doc', this.data);
this.workerReadyPromise.resolve(true);
}.bind(this));
}
constructor.prototype = {
get numPages() {
return this.pdf.numPages;
},
startRendering: function(page) {
// The worker might not be ready to receive the page request yet.
this.workerReadyPromise.then(function() {
this.processorHandler.send('page_request', page.pageNumber + 1);
}.bind(this));
},
getPage: function(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() {
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 constructor;
})();
})(); // self-executing function