2430 lines
82 KiB
JavaScript
Executable File
2430 lines
82 KiB
JavaScript
Executable File
/* -*- 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 isWorker = (typeof window == 'undefined');
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/**
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* Maximum file size of the font.
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*/
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var kMaxFontFileSize = 200000;
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/**
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* Maximum time to wait for a font to be loaded by font-face rules.
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*/
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var kMaxWaitForFontFace = 1000;
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/**
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* Hold a map of decoded fonts and of the standard fourteen Type1
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* fonts and their acronyms.
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*/
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var stdFontMap = {
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"Arial": "Helvetica",
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"Arial_Bold": "Helvetica-Bold",
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"Arial_BoldItalic": "Helvetica-BoldOblique",
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"Arial_Italic": "Helvetica-Oblique",
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"Arial_BoldItalicMT": "Helvetica-BoldOblique",
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"Arial_BoldMT": "Helvetica-Bold",
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"Arial_ItalicMT": "Helvetica-Oblique",
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"ArialMT": "Helvetica",
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"Courier_Bold": "Courier-Bold",
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"Courier_BoldItalic": "Courier-BoldOblique",
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"Courier_Italic": "Courier-Oblique",
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"CourierNew": "Courier",
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"CourierNew_Bold": "Courier-Bold",
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"CourierNew_BoldItalic": "Courier-BoldOblique",
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"CourierNew_Italic": "Courier-Oblique",
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"CourierNewPS_BoldItalicMT": "Courier-BoldOblique",
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"CourierNewPS_BoldMT": "Courier-Bold",
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"CourierNewPS_ItalicMT": "Courier-Oblique",
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"CourierNewPSMT": "Courier",
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"Helvetica_Bold": "Helvetica-Bold",
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"Helvetica_BoldItalic": "Helvetica-BoldOblique",
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"Helvetica_Italic": "Helvetica-Oblique",
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"Symbol_Bold": "Symbol",
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"Symbol_BoldItalic": "Symbol",
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"Symbol_Italic": "Symbol",
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"TimesNewRoman": "Times-Roman",
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"TimesNewRoman_Bold": "Times-Bold",
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"TimesNewRoman_BoldItalic": "Times-BoldItalic",
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"TimesNewRoman_Italic": "Times-Italic",
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"TimesNewRomanPS": "Times-Roman",
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"TimesNewRomanPS_Bold": "Times-Bold",
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"TimesNewRomanPS_BoldItalic": "Times-BoldItalic",
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"TimesNewRomanPS_BoldItalicMT": "Times-BoldItalic",
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"TimesNewRomanPS_BoldMT": "Times-Bold",
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"TimesNewRomanPS_Italic": "Times-Italic",
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"TimesNewRomanPS_ItalicMT": "Times-Italic",
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"TimesNewRomanPSMT": "Times-Roman",
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"TimesNewRomanPSMT_Bold": "Times-Bold",
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"TimesNewRomanPSMT_BoldItalic": "Times-BoldItalic",
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"TimesNewRomanPSMT_Italic": "Times-Italic"
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};
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var FontMeasure = (function FontMeasure() {
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var kScalePrecision = 50;
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var ctx = document.createElement('canvas').getContext('2d');
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ctx.scale(1 / kScalePrecision, 1);
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var current;
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var measureCache;
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return {
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setActive: function fonts_setActive(font, size) {
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if (current = font) {
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var sizes = current.sizes;
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if (!(measureCache = sizes[size]))
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measureCache = sizes[size] = Object.create(null);
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} else {
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measureCache = null
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}
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var name = font.loadedName;
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var bold = font.bold ? "bold" : "normal";
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var italic = font.italic ? "italic" : "normal";
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size *= kScalePrecision;
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var rule = bold + " " + italic + " " + size + 'px "' + name + '"';
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ctx.font = rule;
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},
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measureText: function fonts_measureText(text) {
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var width;
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if (measureCache && (width = measureCache[text]))
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return width;
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width = ctx.measureText(text).width / kScalePrecision;
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if (measureCache)
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measureCache[text] = width;
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return width;
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}
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};
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})();
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var FontLoader = {
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listeningForFontLoad: false,
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bind: function(fonts, callback) {
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function checkFontsLoaded() {
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for (var i = 0; i < objs.length; i++) {
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var fontObj = objs[i];
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if (fontObj.loading) {
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return false;
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}
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}
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document.documentElement.removeEventListener(
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'pdfjsFontLoad', checkFontsLoaded, false);
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callback();
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return true;
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}
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var rules = [], names = [], objs = [];
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for (var i = 0; i < fonts.length; i++) {
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var font = fonts[i];
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var obj = new Font(font.name, font.file, font.properties);
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objs.push(obj);
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var str = '';
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var data = obj.data;
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if (data) {
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var length = data.length;
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for (var j = 0; j < length; j++)
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str += String.fromCharCode(data[j]);
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var rule = isWorker ? obj.bindWorker(str) : obj.bindDOM(str);
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if (rule) {
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rules.push(rule);
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names.push(obj.loadedName);
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}
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}
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}
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this.listeningForFontLoad = false;
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if (!isWorker && rules.length) {
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FontLoader.prepareFontLoadEvent(rules, names, objs);
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}
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if (!checkFontsLoaded()) {
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document.documentElement.addEventListener(
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'pdfjsFontLoad', checkFontsLoaded, false);
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}
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return objs;
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},
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// Set things up so that at least one pdfjsFontLoad event is
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// dispatched when all the @font-face |rules| for |names| have been
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// loaded in a subdocument. It's expected that the load of |rules|
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// has already started in this (outer) document, so that they should
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// be ordered before the load in the subdocument.
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prepareFontLoadEvent: function(rules, names, objs) {
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/** Hack begin */
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// There's no event when a font has finished downloading so the
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// following code is a dirty hack to 'guess' when a font is
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// ready. This code will be obsoleted by Mozilla bug 471915.
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//
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// The only reliable way to know if a font is loaded in Gecko
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// (at the moment) is document.onload in a document with
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// a @font-face rule defined in a "static" stylesheet. We use a
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// subdocument in an <iframe>, set up properly, to know when
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// our @font-face rule was loaded. However, the subdocument and
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// outer document can't share CSS rules, so the inner document
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// is only part of the puzzle. The second piece is an invisible
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// div created in order to force loading of the @font-face in
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// the *outer* document. (The font still needs to be loaded for
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// its metrics, for reflow). We create the div first for the
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// outer document, then create the iframe. Unless something
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// goes really wonkily, we expect the @font-face for the outer
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// document to be processed before the inner. That's still
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// fragile, but seems to work in practice.
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//
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// The postMessage() hackery was added to work around chrome bug
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// 82402.
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var div = document.createElement('div');
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div.setAttribute('style',
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'visibility: hidden;' +
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'width: 10px; height: 10px;' +
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'position: absolute; top: 0px; left: 0px;');
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var html = '';
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for (var i = 0; i < names.length; ++i) {
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html += '<span style="font-family:' + names[i] + '">Hi</span>';
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}
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div.innerHTML = html;
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document.body.appendChild(div);
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if (!this.listeningForFontLoad) {
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window.addEventListener(
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'message',
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function(e) {
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var fontNames = JSON.parse(e.data);
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for (var i = 0; i < objs.length; ++i) {
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var font = objs[i];
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font.loading = false;
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}
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var evt = document.createEvent('Events');
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evt.initEvent('pdfjsFontLoad', true, false);
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document.documentElement.dispatchEvent(evt);
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},
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false);
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this.listeningForFontLoad = true;
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}
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// XXX we should have a time-out here too, and maybe fire
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// pdfjsFontLoadFailed?
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var src = '<!DOCTYPE HTML><html><head>';
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src += '<style type="text/css">';
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for (var i = 0; i < rules.length; ++i) {
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src += rules[i];
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}
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src += '</style>';
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src += '<script type="application/javascript">';
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var fontNamesArray = '';
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for (var i = 0; i < names.length; ++i) {
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fontNamesArray += '"' + names[i] + '", ';
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}
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src += ' var fontNames=[' + fontNamesArray + '];\n';
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src += ' window.onload = function () {\n';
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src += ' top.postMessage(JSON.stringify(fontNames), "*");\n';
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src += ' }';
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src += '</script></head><body>';
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for (var i = 0; i < names.length; ++i) {
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src += '<p style="font-family:\'' + names[i] + '\'">Hi</p>';
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}
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src += '</body></html>';
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var frame = document.createElement('iframe');
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frame.src = 'data:text/html,' + src;
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frame.setAttribute('style',
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'visibility: hidden;' +
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'width: 10px; height: 10px;' +
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'position: absolute; top: 0px; left: 0px;');
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document.body.appendChild(frame);
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/** Hack end */
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}
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};
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var UnicodeRanges = [
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{ 'begin': 0x0000, 'end': 0x007F }, // Basic Latin
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{ 'begin': 0x0080, 'end': 0x00FF }, // Latin-1 Supplement
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{ 'begin': 0x0100, 'end': 0x017F }, // Latin Extended-A
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{ 'begin': 0x0180, 'end': 0x024F }, // Latin Extended-B
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{ 'begin': 0x0250, 'end': 0x02AF }, // IPA Extensions
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{ 'begin': 0x02B0, 'end': 0x02FF }, // Spacing Modifier Letters
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{ 'begin': 0x0300, 'end': 0x036F }, // Combining Diacritical Marks
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{ 'begin': 0x0370, 'end': 0x03FF }, // Greek and Coptic
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{ 'begin': 0x2C80, 'end': 0x2CFF }, // Coptic
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{ 'begin': 0x0400, 'end': 0x04FF }, // Cyrillic
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{ 'begin': 0x0530, 'end': 0x058F }, // Armenian
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{ 'begin': 0x0590, 'end': 0x05FF }, // Hebrew
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{ 'begin': 0xA500, 'end': 0xA63F }, // Vai
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{ 'begin': 0x0600, 'end': 0x06FF }, // Arabic
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{ 'begin': 0x07C0, 'end': 0x07FF }, // NKo
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{ 'begin': 0x0900, 'end': 0x097F }, // Devanagari
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{ 'begin': 0x0980, 'end': 0x09FF }, // Bengali
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{ 'begin': 0x0A00, 'end': 0x0A7F }, // Gurmukhi
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{ 'begin': 0x0A80, 'end': 0x0AFF }, // Gujarati
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{ 'begin': 0x0B00, 'end': 0x0B7F }, // Oriya
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{ 'begin': 0x0B80, 'end': 0x0BFF }, // Tamil
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{ 'begin': 0x0C00, 'end': 0x0C7F }, // Telugu
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{ 'begin': 0x0C80, 'end': 0x0CFF }, // Kannada
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{ 'begin': 0x0D00, 'end': 0x0D7F }, // Malayalam
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{ 'begin': 0x0E00, 'end': 0x0E7F }, // Thai
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{ 'begin': 0x0E80, 'end': 0x0EFF }, // Lao
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{ 'begin': 0x10A0, 'end': 0x10FF }, // Georgian
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{ 'begin': 0x1B00, 'end': 0x1B7F }, // Balinese
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{ 'begin': 0x1100, 'end': 0x11FF }, // Hangul Jamo
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{ 'begin': 0x1E00, 'end': 0x1EFF }, // Latin Extended Additional
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{ 'begin': 0x1F00, 'end': 0x1FFF }, // Greek Extended
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{ 'begin': 0x2000, 'end': 0x206F }, // General Punctuation
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{ 'begin': 0x2070, 'end': 0x209F }, // Superscripts And Subscripts
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{ 'begin': 0x20A0, 'end': 0x20CF }, // Currency Symbol
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{ 'begin': 0x20D0, 'end': 0x20FF }, // Combining Diacritical Marks For Symbols
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{ 'begin': 0x2100, 'end': 0x214F }, // Letterlike Symbols
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{ 'begin': 0x2150, 'end': 0x218F }, // Number Forms
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{ 'begin': 0x2190, 'end': 0x21FF }, // Arrows
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{ 'begin': 0x2200, 'end': 0x22FF }, // Mathematical Operators
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{ 'begin': 0x2300, 'end': 0x23FF }, // Miscellaneous Technical
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{ 'begin': 0x2400, 'end': 0x243F }, // Control Pictures
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{ 'begin': 0x2440, 'end': 0x245F }, // Optical Character Recognition
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{ 'begin': 0x2460, 'end': 0x24FF }, // Enclosed Alphanumerics
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{ 'begin': 0x2500, 'end': 0x257F }, // Box Drawing
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{ 'begin': 0x2580, 'end': 0x259F }, // Block Elements
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{ 'begin': 0x25A0, 'end': 0x25FF }, // Geometric Shapes
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{ 'begin': 0x2600, 'end': 0x26FF }, // Miscellaneous Symbols
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{ 'begin': 0x2700, 'end': 0x27BF }, // Dingbats
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{ 'begin': 0x3000, 'end': 0x303F }, // CJK Symbols And Punctuation
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{ 'begin': 0x3040, 'end': 0x309F }, // Hiragana
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{ 'begin': 0x30A0, 'end': 0x30FF }, // Katakana
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{ 'begin': 0x3100, 'end': 0x312F }, // Bopomofo
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{ 'begin': 0x3130, 'end': 0x318F }, // Hangul Compatibility Jamo
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{ 'begin': 0xA840, 'end': 0xA87F }, // Phags-pa
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{ 'begin': 0x3200, 'end': 0x32FF }, // Enclosed CJK Letters And Months
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{ 'begin': 0x3300, 'end': 0x33FF }, // CJK Compatibility
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{ 'begin': 0xAC00, 'end': 0xD7AF }, // Hangul Syllables
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{ 'begin': 0xD800, 'end': 0xDFFF }, // Non-Plane 0 *
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{ 'begin': 0x10900, 'end': 0x1091F }, // Phoenicia
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{ 'begin': 0x4E00, 'end': 0x9FFF }, // CJK Unified Ideographs
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{ 'begin': 0xE000, 'end': 0xF8FF }, // Private Use Area (plane 0)
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{ 'begin': 0x31C0, 'end': 0x31EF }, // CJK Strokes
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{ 'begin': 0xFB00, 'end': 0xFB4F }, // Alphabetic Presentation Forms
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{ 'begin': 0xFB50, 'end': 0xFDFF }, // Arabic Presentation Forms-A
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{ 'begin': 0xFE20, 'end': 0xFE2F }, // Combining Half Marks
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{ 'begin': 0xFE10, 'end': 0xFE1F }, // Vertical Forms
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{ 'begin': 0xFE50, 'end': 0xFE6F }, // Small Form Variants
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{ 'begin': 0xFE70, 'end': 0xFEFF }, // Arabic Presentation Forms-B
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{ 'begin': 0xFF00, 'end': 0xFFEF }, // Halfwidth And Fullwidth Forms
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{ 'begin': 0xFFF0, 'end': 0xFFFF }, // Specials
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{ 'begin': 0x0F00, 'end': 0x0FFF }, // Tibetan
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{ 'begin': 0x0700, 'end': 0x074F }, // Syriac
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{ 'begin': 0x0780, 'end': 0x07BF }, // Thaana
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{ 'begin': 0x0D80, 'end': 0x0DFF }, // Sinhala
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{ 'begin': 0x1000, 'end': 0x109F }, // Myanmar
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{ 'begin': 0x1200, 'end': 0x137F }, // Ethiopic
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{ 'begin': 0x13A0, 'end': 0x13FF }, // Cherokee
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{ 'begin': 0x1400, 'end': 0x167F }, // Unified Canadian Aboriginal Syllabics
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{ 'begin': 0x1680, 'end': 0x169F }, // Ogham
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{ 'begin': 0x16A0, 'end': 0x16FF }, // Runic
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{ 'begin': 0x1780, 'end': 0x17FF }, // Khmer
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{ 'begin': 0x1800, 'end': 0x18AF }, // Mongolian
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{ 'begin': 0x2800, 'end': 0x28FF }, // Braille Patterns
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{ 'begin': 0xA000, 'end': 0xA48F }, // Yi Syllables
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{ 'begin': 0x1700, 'end': 0x171F }, // Tagalog
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{ 'begin': 0x10300, 'end': 0x1032F }, // Old Italic
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{ 'begin': 0x10330, 'end': 0x1034F }, // Gothic
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{ 'begin': 0x10400, 'end': 0x1044F }, // Deseret
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{ 'begin': 0x1D000, 'end': 0x1D0FF }, // Byzantine Musical Symbols
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{ 'begin': 0x1D400, 'end': 0x1D7FF }, // Mathematical Alphanumeric Symbols
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{ 'begin': 0xFF000, 'end': 0xFFFFD }, // Private Use (plane 15)
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{ 'begin': 0xFE00, 'end': 0xFE0F }, // Variation Selectors
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{ 'begin': 0xE0000, 'end': 0xE007F }, // Tags
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{ 'begin': 0x1900, 'end': 0x194F }, // Limbu
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{ 'begin': 0x1950, 'end': 0x197F }, // Tai Le
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{ 'begin': 0x1980, 'end': 0x19DF }, // New Tai Lue
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{ 'begin': 0x1A00, 'end': 0x1A1F }, // Buginese
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{ 'begin': 0x2C00, 'end': 0x2C5F }, // Glagolitic
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{ 'begin': 0x2D30, 'end': 0x2D7F }, // Tifinagh
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{ 'begin': 0x4DC0, 'end': 0x4DFF }, // Yijing Hexagram Symbols
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{ 'begin': 0xA800, 'end': 0xA82F }, // Syloti Nagri
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{ 'begin': 0x10000, 'end': 0x1007F }, // Linear B Syllabary
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{ 'begin': 0x10140, 'end': 0x1018F }, // Ancient Greek Numbers
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{ 'begin': 0x10380, 'end': 0x1039F }, // Ugaritic
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{ 'begin': 0x103A0, 'end': 0x103DF }, // Old Persian
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{ 'begin': 0x10450, 'end': 0x1047F }, // Shavian
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{ 'begin': 0x10480, 'end': 0x104AF }, // Osmanya
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{ 'begin': 0x10800, 'end': 0x1083F }, // Cypriot Syllabary
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{ 'begin': 0x10A00, 'end': 0x10A5F }, // Kharoshthi
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{ 'begin': 0x1D300, 'end': 0x1D35F }, // Tai Xuan Jing Symbols
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{ 'begin': 0x12000, 'end': 0x123FF }, // Cuneiform
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{ 'begin': 0x1D360, 'end': 0x1D37F }, // Counting Rod Numerals
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{ 'begin': 0x1B80, 'end': 0x1BBF }, // Sundanese
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{ 'begin': 0x1C00, 'end': 0x1C4F }, // Lepcha
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{ 'begin': 0x1C50, 'end': 0x1C7F }, // Ol Chiki
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{ 'begin': 0xA880, 'end': 0xA8DF }, // Saurashtra
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{ 'begin': 0xA900, 'end': 0xA92F }, // Kayah Li
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{ 'begin': 0xA930, 'end': 0xA95F }, // Rejang
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{ 'begin': 0xAA00, 'end': 0xAA5F }, // Cham
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{ 'begin': 0x10190, 'end': 0x101CF }, // Ancient Symbols
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{ 'begin': 0x101D0, 'end': 0x101FF }, // Phaistos Disc
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{ 'begin': 0x102A0, 'end': 0x102DF }, // Carian
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{ 'begin': 0x1F030, 'end': 0x1F09F } // Domino Tiles
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];
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function getUnicodeRangeFor(value) {
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for (var i = 0; i < UnicodeRanges.length; i++) {
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var range = UnicodeRanges[i];
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if (value >= range.begin && value < range.end)
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return i;
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}
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return -1;
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}
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/**
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* 'Font' is the class the outside world should use, it encapsulate all the font
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* decoding logics whatever type it is (assuming the font type is supported).
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*
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* For example to read a Type1 font and to attach it to the document:
|
|
* var type1Font = new Font("MyFontName", binaryFile, propertiesObject);
|
|
* type1Font.bind();
|
|
*/
|
|
var Font = (function Font() {
|
|
var constructor = function font_constructor(name, file, properties) {
|
|
this.name = name;
|
|
this.encoding = properties.encoding;
|
|
this.sizes = [];
|
|
|
|
// If the font is to be ignored, register it like an already loaded font
|
|
// to avoid the cost of waiting for it be be loaded by the platform.
|
|
if (properties.ignore) {
|
|
this.loadedName = 'Arial';
|
|
this.loading = false;
|
|
return;
|
|
}
|
|
|
|
if (!file) {
|
|
var fontName = stdFontMap[name];
|
|
this.bold = (fontName.indexOf("Bold") != -1);
|
|
this.italic = (fontName.indexOf("Oblique") != -1);
|
|
this.loadedName = fontName.split("-")[0];
|
|
this.loading = false;
|
|
return;
|
|
}
|
|
|
|
var data;
|
|
switch (properties.type) {
|
|
case 'Type1':
|
|
case 'CIDFontType0':
|
|
this.mimetype = 'font/opentype';
|
|
|
|
var subtype = properties.subtype;
|
|
if (subtype === 'Type1C') {
|
|
var cff = new Type2CFF(file, properties);
|
|
} else {
|
|
var cff = new CFF(name, file, properties);
|
|
}
|
|
|
|
// Wrap the CFF data inside an OTF font file
|
|
data = this.convert(name, cff, properties);
|
|
break;
|
|
|
|
case 'TrueType':
|
|
case 'CIDFontType2':
|
|
this.mimetype = 'font/opentype';
|
|
|
|
// Repair the TrueType file if it is can be damaged in the point of
|
|
// view of the sanitizer
|
|
data = this.checkAndRepair(name, file, properties);
|
|
break;
|
|
|
|
default:
|
|
warn('Font ' + properties.type + ' is not supported');
|
|
break;
|
|
}
|
|
|
|
this.data = data;
|
|
this.type = properties.type;
|
|
this.textMatrix = properties.textMatrix;
|
|
this.loadedName = getUniqueName();
|
|
this.compositeFont = properties.compositeFont;
|
|
this.loading = true;
|
|
};
|
|
|
|
var numFonts = 0;
|
|
function getUniqueName() {
|
|
return 'pdfFont' + numFonts++;
|
|
}
|
|
|
|
function stringToArray(str) {
|
|
var array = [];
|
|
for (var i = 0; i < str.length; ++i)
|
|
array[i] = str.charCodeAt(i);
|
|
|
|
return array;
|
|
};
|
|
|
|
function int16(bytes) {
|
|
return (bytes[0] << 8) + (bytes[1] & 0xff);
|
|
};
|
|
|
|
function int32(bytes) {
|
|
return (bytes[0] << 24) + (bytes[1] << 16) +
|
|
(bytes[2] << 8) + (bytes[3] & 0xff);
|
|
};
|
|
|
|
function getMaxPower2(number) {
|
|
var maxPower = 0;
|
|
var value = number;
|
|
while (value >= 2) {
|
|
value /= 2;
|
|
maxPower++;
|
|
}
|
|
|
|
value = 2;
|
|
for (var i = 1; i < maxPower; i++)
|
|
value *= 2;
|
|
return value;
|
|
};
|
|
|
|
function string16(value) {
|
|
return String.fromCharCode((value >> 8) & 0xff) +
|
|
String.fromCharCode(value & 0xff);
|
|
};
|
|
|
|
function string32(value) {
|
|
return String.fromCharCode((value >> 24) & 0xff) +
|
|
String.fromCharCode((value >> 16) & 0xff) +
|
|
String.fromCharCode((value >> 8) & 0xff) +
|
|
String.fromCharCode(value & 0xff);
|
|
};
|
|
|
|
function createOpenTypeHeader(sfnt, file, offsets, numTables) {
|
|
// sfnt version (4 bytes)
|
|
var header = sfnt;
|
|
|
|
// numTables (2 bytes)
|
|
header += string16(numTables);
|
|
|
|
// searchRange (2 bytes)
|
|
var tablesMaxPower2 = getMaxPower2(numTables);
|
|
var searchRange = tablesMaxPower2 * 16;
|
|
header += string16(searchRange);
|
|
|
|
// entrySelector (2 bytes)
|
|
header += string16(Math.log(tablesMaxPower2) / Math.log(2));
|
|
|
|
// rangeShift (2 bytes)
|
|
header += string16(numTables * 16 - searchRange);
|
|
|
|
file.set(stringToArray(header), offsets.currentOffset);
|
|
offsets.currentOffset += header.length;
|
|
offsets.virtualOffset += header.length;
|
|
};
|
|
|
|
function createTableEntry(file, offsets, tag, data) {
|
|
// offset
|
|
var offset = offsets.virtualOffset;
|
|
|
|
// length
|
|
var length = data.length;
|
|
|
|
// Per spec tables must be 4-bytes align so add padding as needed
|
|
while (data.length & 3)
|
|
data.push(0x00);
|
|
|
|
while (offsets.virtualOffset & 3)
|
|
offsets.virtualOffset++;
|
|
|
|
// checksum
|
|
var checksum = 0, n = data.length;
|
|
for (var i = 0; i < n; i+=4)
|
|
checksum = (checksum + int32([data[i], data[i+1], data[i+2], data[i+3]])) | 0;
|
|
|
|
var tableEntry = (tag + string32(checksum) +
|
|
string32(offset) + string32(length));
|
|
tableEntry = stringToArray(tableEntry);
|
|
file.set(tableEntry, offsets.currentOffset);
|
|
|
|
offsets.currentOffset += tableEntry.length;
|
|
offsets.virtualOffset += data.length;
|
|
};
|
|
|
|
function getRanges(glyphs) {
|
|
// Array.sort() sorts by characters, not numerically, so convert to an
|
|
// array of characters.
|
|
var codes = [];
|
|
var length = glyphs.length;
|
|
for (var n = 0; n < length; ++n)
|
|
codes.push(String.fromCharCode(glyphs[n].unicode));
|
|
codes.sort();
|
|
|
|
// Split the sorted codes into ranges.
|
|
var ranges = [];
|
|
for (var n = 0; n < length; ) {
|
|
var start = codes[n++].charCodeAt(0);
|
|
var end = start;
|
|
while (n < length && end + 1 == codes[n].charCodeAt(0)) {
|
|
++end;
|
|
++n;
|
|
}
|
|
ranges.push([start, end]);
|
|
}
|
|
|
|
return ranges;
|
|
};
|
|
|
|
function createCMapTable(glyphs, deltas) {
|
|
var ranges = getRanges(glyphs);
|
|
|
|
var numTables = 1;
|
|
var cmap = '\x00\x00' + // version
|
|
string16(numTables) + // numTables
|
|
'\x00\x03' + // platformID
|
|
'\x00\x01' + // encodingID
|
|
string32(4 + numTables * 8); // start of the table record
|
|
|
|
var segCount = ranges.length + 1;
|
|
var segCount2 = segCount * 2;
|
|
var searchRange = getMaxPower2(segCount) * 2;
|
|
var searchEntry = Math.log(segCount) / Math.log(2);
|
|
var rangeShift = 2 * segCount - searchRange;
|
|
|
|
// Fill up the 4 parallel arrays describing the segments.
|
|
var startCount = '';
|
|
var endCount = '';
|
|
var idDeltas = '';
|
|
var idRangeOffsets = '';
|
|
var glyphsIds = '';
|
|
var bias = 0;
|
|
for (var i = 0; i < segCount - 1; i++) {
|
|
var range = ranges[i];
|
|
var start = range[0];
|
|
var end = range[1];
|
|
var offset = (segCount - i) * 2 + bias * 2;
|
|
bias += (end - start + 1);
|
|
|
|
startCount += string16(start);
|
|
endCount += string16(end);
|
|
idDeltas += string16(0);
|
|
idRangeOffsets += string16(offset);
|
|
}
|
|
|
|
for (var i = 0; i < glyphs.length; i++)
|
|
glyphsIds += string16(deltas ? deltas[i] : i + 1);
|
|
|
|
endCount += '\xFF\xFF';
|
|
startCount += '\xFF\xFF';
|
|
idDeltas += '\x00\x01';
|
|
idRangeOffsets += '\x00\x00';
|
|
|
|
var format314 = '\x00\x00' + // language
|
|
string16(segCount2) +
|
|
string16(searchRange) +
|
|
string16(searchEntry) +
|
|
string16(rangeShift) +
|
|
endCount + '\x00\x00' + startCount +
|
|
idDeltas + idRangeOffsets + glyphsIds;
|
|
|
|
return stringToArray(cmap +
|
|
'\x00\x04' + // format
|
|
string16(format314.length + 4) + // length
|
|
format314);
|
|
};
|
|
|
|
function createOS2Table(properties) {
|
|
var ulUnicodeRange1 = 0;
|
|
var ulUnicodeRange2 = 0;
|
|
var ulUnicodeRange3 = 0;
|
|
var ulUnicodeRange4 = 0;
|
|
|
|
var charset = properties.charset;
|
|
if (charset && charset.length) {
|
|
var firstCharIndex = null;
|
|
var lastCharIndex = 0;
|
|
|
|
for (var i = 0; i < charset.length; i++) {
|
|
var code = GlyphsUnicode[charset[i]];
|
|
if (firstCharIndex > code || !firstCharIndex)
|
|
firstCharIndex = code;
|
|
if (lastCharIndex < code)
|
|
lastCharIndex = code;
|
|
|
|
var position = getUnicodeRangeFor(code);
|
|
if (position < 32) {
|
|
ulUnicodeRange1 |= 1 << position;
|
|
} else if (position < 64) {
|
|
ulUnicodeRange2 |= 1 << position - 32;
|
|
} else if (position < 96) {
|
|
ulUnicodeRange3 |= 1 << position - 64;
|
|
} else if (position < 123) {
|
|
ulUnicodeRange4 |= 1 << position - 96;
|
|
} else {
|
|
error('Unicode ranges Bits > 123 are reserved for internal usage');
|
|
}
|
|
}
|
|
}
|
|
|
|
return '\x00\x03' + // version
|
|
'\x02\x24' + // xAvgCharWidth
|
|
'\x01\xF4' + // usWeightClass
|
|
'\x00\x05' + // usWidthClass
|
|
'\x00\x00' + // fstype (0 to let the font loads via font-face on IE)
|
|
'\x02\x8A' + // ySubscriptXSize
|
|
'\x02\xBB' + // ySubscriptYSize
|
|
'\x00\x00' + // ySubscriptXOffset
|
|
'\x00\x8C' + // ySubscriptYOffset
|
|
'\x02\x8A' + // ySuperScriptXSize
|
|
'\x02\xBB' + // ySuperScriptYSize
|
|
'\x00\x00' + // ySuperScriptXOffset
|
|
'\x01\xDF' + // ySuperScriptYOffset
|
|
'\x00\x31' + // yStrikeOutSize
|
|
'\x01\x02' + // yStrikeOutPosition
|
|
'\x00\x00' + // sFamilyClass
|
|
'\x00\x00\x06' +
|
|
String.fromCharCode(properties.fixedPitch ? 0x09 : 0x00) +
|
|
'\x00\x00\x00\x00\x00\x00' + // Panose
|
|
string32(ulUnicodeRange1) + // ulUnicodeRange1 (Bits 0-31)
|
|
string32(ulUnicodeRange2) + // ulUnicodeRange2 (Bits 32-63)
|
|
string32(ulUnicodeRange3) + // ulUnicodeRange3 (Bits 64-95)
|
|
string32(ulUnicodeRange4) + // ulUnicodeRange4 (Bits 96-127)
|
|
'\x2A\x32\x31\x2A' + // achVendID
|
|
string16(properties.italicAngle ? 1 : 0) + // fsSelection
|
|
string16(firstCharIndex ||
|
|
properties.firstChar) + // usFirstCharIndex
|
|
string16(lastCharIndex || properties.lastChar) + // usLastCharIndex
|
|
string16(properties.ascent) + // sTypoAscender
|
|
string16(properties.descent) + // sTypoDescender
|
|
'\x00\x64' + // sTypoLineGap (7%-10% of the unitsPerEM value)
|
|
string16(properties.ascent) + // usWinAscent
|
|
string16(-properties.descent) + // usWinDescent
|
|
'\x00\x00\x00\x00' + // ulCodePageRange1 (Bits 0-31)
|
|
'\x00\x00\x00\x00' + // ulCodePageRange2 (Bits 32-63)
|
|
string16(properties.xHeight) + // sxHeight
|
|
string16(properties.capHeight) + // sCapHeight
|
|
string16(0) + // usDefaultChar
|
|
string16(firstCharIndex || properties.firstChar) + // usBreakChar
|
|
'\x00\x03'; // usMaxContext
|
|
};
|
|
|
|
function createPostTable(properties) {
|
|
var angle = Math.floor(properties.italicAngle * (Math.pow(2, 16)));
|
|
return '\x00\x03\x00\x00' + // Version number
|
|
string32(angle) + // italicAngle
|
|
'\x00\x00' + // underlinePosition
|
|
'\x00\x00' + // underlineThickness
|
|
string32(properties.fixedPitch) + // isFixedPitch
|
|
'\x00\x00\x00\x00' + // minMemType42
|
|
'\x00\x00\x00\x00' + // maxMemType42
|
|
'\x00\x00\x00\x00' + // minMemType1
|
|
'\x00\x00\x00\x00'; // maxMemType1
|
|
};
|
|
|
|
function createNameTable(name) {
|
|
var strings = [
|
|
'Original licence', // 0.Copyright
|
|
name, // 1.Font family
|
|
'Unknown', // 2.Font subfamily (font weight)
|
|
'uniqueID', // 3.Unique ID
|
|
name, // 4.Full font name
|
|
'Version 0.11', // 5.Version
|
|
'', // 6.Postscript name
|
|
'Unknown', // 7.Trademark
|
|
'Unknown', // 8.Manufacturer
|
|
'Unknown' // 9.Designer
|
|
];
|
|
|
|
// Mac want 1-byte per character strings while Windows want
|
|
// 2-bytes per character, so duplicate the names table
|
|
var stringsUnicode = [];
|
|
for (var i = 0; i < strings.length; i++) {
|
|
var str = strings[i];
|
|
|
|
var strUnicode = '';
|
|
for (var j = 0; j < str.length; j++)
|
|
strUnicode += string16(str.charCodeAt(j));
|
|
stringsUnicode.push(strUnicode);
|
|
}
|
|
|
|
var names = [strings, stringsUnicode];
|
|
var platforms = ['\x00\x01', '\x00\x03'];
|
|
var encodings = ['\x00\x00', '\x00\x01'];
|
|
var languages = ['\x00\x00', '\x04\x09'];
|
|
|
|
var namesRecordCount = strings.length * platforms.length;
|
|
var nameTable =
|
|
'\x00\x00' + // format
|
|
string16(namesRecordCount) + // Number of names Record
|
|
string16(namesRecordCount * 12 + 6); // Storage
|
|
|
|
// Build the name records field
|
|
var strOffset = 0;
|
|
for (var i = 0; i < platforms.length; i++) {
|
|
var strs = names[i];
|
|
for (var j = 0; j < strs.length; j++) {
|
|
var str = strs[j];
|
|
var nameRecord =
|
|
platforms[i] + // platform ID
|
|
encodings[i] + // encoding ID
|
|
languages[i] + // language ID
|
|
string16(j) + // name ID
|
|
string16(str.length) +
|
|
string16(strOffset);
|
|
nameTable += nameRecord;
|
|
strOffset += str.length;
|
|
}
|
|
}
|
|
|
|
nameTable += strings.join('') + stringsUnicode.join('');
|
|
return nameTable;
|
|
}
|
|
|
|
constructor.prototype = {
|
|
name: null,
|
|
font: null,
|
|
mimetype: null,
|
|
encoding: null,
|
|
|
|
checkAndRepair: function font_checkAndRepair(name, font, properties) {
|
|
function readTableEntry(file) {
|
|
// tag
|
|
var tag = file.getBytes(4);
|
|
tag = String.fromCharCode(tag[0]) +
|
|
String.fromCharCode(tag[1]) +
|
|
String.fromCharCode(tag[2]) +
|
|
String.fromCharCode(tag[3]);
|
|
|
|
var checksum = int32(file.getBytes(4));
|
|
var offset = int32(file.getBytes(4));
|
|
var length = int32(file.getBytes(4));
|
|
|
|
// Read the table associated data
|
|
var previousPosition = file.pos;
|
|
file.pos = file.start ? file.start : 0;
|
|
file.skip(offset);
|
|
var data = file.getBytes(length);
|
|
file.pos = previousPosition;
|
|
|
|
if (tag == 'head')
|
|
data[8] = data[9] = data[10] = data[11] = 0; // clearing checksum adjustment
|
|
|
|
return {
|
|
tag: tag,
|
|
checksum: checksum,
|
|
length: length,
|
|
offset: offset,
|
|
data: data
|
|
};
|
|
};
|
|
|
|
function readOpenTypeHeader(ttf) {
|
|
return {
|
|
version: ttf.getBytes(4),
|
|
numTables: int16(ttf.getBytes(2)),
|
|
searchRange: int16(ttf.getBytes(2)),
|
|
entrySelector: int16(ttf.getBytes(2)),
|
|
rangeShift: int16(ttf.getBytes(2))
|
|
};
|
|
};
|
|
|
|
function replaceCMapTable(cmap, font, properties) {
|
|
var start = (font.start ? font.start : 0) + cmap.offset;
|
|
font.pos = start;
|
|
|
|
var version = int16(font.getBytes(2));
|
|
var numRecords = int16(font.getBytes(2));
|
|
|
|
var records = [];
|
|
for (var i = 0; i < numRecords; i++) {
|
|
records.push({
|
|
platformID: int16(font.getBytes(2)),
|
|
encodingID: int16(font.getBytes(2)),
|
|
offset: int32(font.getBytes(4))
|
|
});
|
|
};
|
|
|
|
var encoding = properties.encoding;
|
|
var charset = properties.charset;
|
|
for (var i = 0; i < numRecords; i++) {
|
|
var table = records[i];
|
|
font.pos = start + table.offset;
|
|
|
|
var format = int16(font.getBytes(2));
|
|
var length = int16(font.getBytes(2));
|
|
var language = int16(font.getBytes(2));
|
|
|
|
if (format == 0) {
|
|
// Characters below 0x20 are controls characters that are hardcoded
|
|
// into the platform so if some characters in the font are assigned
|
|
// under this limit they will not be displayed so let's rewrite the
|
|
// CMap.
|
|
var glyphs = [];
|
|
var deltas = [];
|
|
for (var j = 0; j < 256; j++) {
|
|
var index = font.getByte();
|
|
if (index) {
|
|
deltas.push(index);
|
|
glyphs.push({ unicode : j });
|
|
}
|
|
}
|
|
|
|
var rewrite = false;
|
|
for (var code in encoding) {
|
|
if (code < 0x20 && encoding[code])
|
|
rewrite = true;
|
|
|
|
if (rewrite)
|
|
encoding[code] = parseInt(code) + 0x1F;
|
|
}
|
|
|
|
if (rewrite) {
|
|
for (var j = 0; j < glyphs.length; j++) {
|
|
glyphs[j].unicode += 0x1F;
|
|
}
|
|
}
|
|
cmap.data = createCMapTable(glyphs, deltas);
|
|
} else if (format == 6 && numRecords == 1 && !encoding.empty) {
|
|
// Format 0 alone is not allowed by the sanitizer so let's rewrite
|
|
// that to a 3-1-4 Unicode BMP table
|
|
TODO('Use an other source of informations than ' +
|
|
'charset here, it is not reliable');
|
|
var glyphs = [];
|
|
for (var j = 0; j < charset.length; j++) {
|
|
glyphs.push({
|
|
unicode: GlyphsUnicode[charset[j]] || 0
|
|
});
|
|
}
|
|
|
|
cmap.data = createCMapTable(glyphs);
|
|
} else if (format == 6 && numRecords == 1) {
|
|
// Format 6 is a 2-bytes dense mapping, which means the font data
|
|
// lives glue together even if they are pretty far in the unicode
|
|
// table. (This looks weird, so I can have missed something), this
|
|
// works on Linux but seems to fails on Mac so let's rewrite the
|
|
// cmap table to a 3-1-4 style
|
|
var firstCode = int16(font.getBytes(2));
|
|
var entryCount = int16(font.getBytes(2));
|
|
|
|
var glyphs = [];
|
|
var min = 0xffff, max = 0;
|
|
for (var j = 0; j < entryCount; j++) {
|
|
var charcode = int16(font.getBytes(2));
|
|
glyphs.push(charcode);
|
|
|
|
if (charcode < min)
|
|
min = charcode;
|
|
if (charcode > max)
|
|
max = charcode;
|
|
}
|
|
|
|
// Since Format 6 is a dense array, check for gaps
|
|
for (var j = min; j < max; j++) {
|
|
if (glyphs.indexOf(j) == -1)
|
|
glyphs.push(j);
|
|
}
|
|
|
|
for (var j = 0; j < glyphs.length; j++)
|
|
glyphs[j] = { unicode: glyphs[j] + firstCode };
|
|
|
|
var ranges = getRanges(glyphs);
|
|
assert(ranges.length == 1, 'Got ' + ranges.length +
|
|
' ranges in a dense array');
|
|
|
|
var denseRange = ranges[0];
|
|
var start = denseRange[0];
|
|
var end = denseRange[1];
|
|
var index = firstCode;
|
|
for (var j = start; j <= end; j++)
|
|
encoding[index++] = glyphs[j - firstCode - 1].unicode;
|
|
cmap.data = createCMapTable(glyphs);
|
|
}
|
|
}
|
|
};
|
|
|
|
// Check that required tables are present
|
|
var requiredTables = ['OS/2', 'cmap', 'head', 'hhea',
|
|
'hmtx', 'maxp', 'name', 'post'];
|
|
|
|
var header = readOpenTypeHeader(font);
|
|
var numTables = header.numTables;
|
|
|
|
var cmap, maxp, hhea, hmtx;
|
|
var tables = [];
|
|
for (var i = 0; i < numTables; i++) {
|
|
var table = readTableEntry(font);
|
|
var index = requiredTables.indexOf(table.tag);
|
|
if (index != -1) {
|
|
if (table.tag == 'cmap')
|
|
cmap = table;
|
|
else if (table.tag == 'maxp')
|
|
maxp = table;
|
|
else if (table.tag == 'hhea')
|
|
hhea = table;
|
|
else if (table.tag == 'hmtx')
|
|
hmtx = table;
|
|
|
|
requiredTables.splice(index, 1);
|
|
}
|
|
tables.push(table);
|
|
}
|
|
|
|
// Create a new file to hold the new version of our truetype with a new
|
|
// header and new offsets
|
|
var ttf = new Uint8Array(kMaxFontFileSize);
|
|
|
|
// The offsets object holds at the same time a representation of where
|
|
// to write the table entry information about a table and another offset
|
|
// representing the offset where to put the actual data of a particular
|
|
// table
|
|
var numTables = header.numTables + requiredTables.length;
|
|
var offsets = {
|
|
currentOffset: 0,
|
|
virtualOffset: numTables * (4 * 4)
|
|
};
|
|
|
|
// The new numbers of tables will be the last one plus the num
|
|
// of missing tables
|
|
createOpenTypeHeader('\x00\x01\x00\x00', ttf, offsets, numTables);
|
|
|
|
if (requiredTables.indexOf('OS/2') != -1) {
|
|
tables.push({
|
|
tag: 'OS/2',
|
|
data: stringToArray(createOS2Table(properties))
|
|
});
|
|
}
|
|
|
|
// Ensure the hmtx tables contains an advance width and a sidebearing
|
|
// for the number of glyphs declared in the maxp table
|
|
font.pos = (font.start ? font.start : 0) + maxp.offset;
|
|
var version = int16(font.getBytes(4));
|
|
var numGlyphs = int16(font.getBytes(2));
|
|
|
|
font.pos = (font.start ? font.start : 0) + hhea.offset;
|
|
font.pos += hhea.length - 2;
|
|
var numOfHMetrics = int16(font.getBytes(2));
|
|
|
|
var numOfSidebearings = numGlyphs - numOfHMetrics;
|
|
var numMissing = numOfSidebearings -
|
|
((hmtx.length - numOfHMetrics * 4) >> 1);
|
|
if (numMissing > 0) {
|
|
font.pos = (font.start ? font.start : 0) + hmtx.offset;
|
|
var metrics = "";
|
|
for (var i = 0; i < hmtx.length; i++)
|
|
metrics += String.fromCharCode(font.getByte());
|
|
for (var i = 0; i < numMissing; i++)
|
|
metrics += "\x00\x00";
|
|
hmtx.data = stringToArray(metrics);
|
|
}
|
|
|
|
// Sanitizer reduces the glyph advanceWidth to the maxAdvanceWidth
|
|
// Sometimes it's 0. That needs to be fixed
|
|
if (hhea.data[10] == 0 && hhea.data[11] == 0) {
|
|
hhea.data[10] = 0xFF;
|
|
hhea.data[11] = 0xFF;
|
|
}
|
|
|
|
// Replace the old CMAP table with a shiny new one
|
|
if (properties.type == 'CIDFontType2') {
|
|
// Type2 composite fonts map characters directly to glyphs so the cmap
|
|
// table must be replaced.
|
|
|
|
var glyphs = [];
|
|
var charset = properties.charset;
|
|
if (!charset.length) {
|
|
// Type2 composite fonts map characters directly to glyphs so the cmap
|
|
for (var i = 1; i < numGlyphs; i++) {
|
|
glyphs.push({
|
|
unicode: i
|
|
});
|
|
}
|
|
} else {
|
|
for (var i = 1; i < charset.length; i++) {
|
|
var index = charset.indexOf(i);
|
|
if (index == -1)
|
|
break;
|
|
|
|
glyphs.push({
|
|
unicode: index
|
|
});
|
|
}
|
|
}
|
|
|
|
if (!cmap) {
|
|
cmap = {
|
|
tag: 'cmap',
|
|
data: null
|
|
};
|
|
tables.push(cmap);
|
|
}
|
|
cmap.data = createCMapTable(glyphs);
|
|
} else {
|
|
replaceCMapTable(cmap, font, properties);
|
|
}
|
|
|
|
// Rewrite the 'post' table if needed
|
|
if (requiredTables.indexOf('post') != -1) {
|
|
tables.push({
|
|
tag: 'post',
|
|
data: stringToArray(createPostTable(properties))
|
|
});
|
|
}
|
|
|
|
// Rewrite the 'name' table if needed
|
|
if (requiredTables.indexOf('name') != -1) {
|
|
tables.push({
|
|
tag: 'name',
|
|
data: stringToArray(createNameTable(this.name))
|
|
});
|
|
}
|
|
|
|
// Tables needs to be written by ascendant alphabetic order
|
|
tables.sort(function tables_sort(a, b) {
|
|
return (a.tag > b.tag) - (a.tag < b.tag);
|
|
});
|
|
|
|
// rewrite the tables but tweak offsets
|
|
for (var i = 0; i < tables.length; i++) {
|
|
var table = tables[i];
|
|
var data = [];
|
|
|
|
var tableData = table.data;
|
|
for (var j = 0; j < tableData.length; j++)
|
|
data.push(tableData[j]);
|
|
createTableEntry(ttf, offsets, table.tag, data);
|
|
}
|
|
|
|
// Add the table datas
|
|
for (var i = 0; i < tables.length; i++) {
|
|
var table = tables[i];
|
|
var tableData = table.data;
|
|
ttf.set(tableData, offsets.currentOffset);
|
|
offsets.currentOffset += tableData.length;
|
|
|
|
// 4-byte aligned data
|
|
while (offsets.currentOffset & 3)
|
|
offsets.currentOffset++;
|
|
}
|
|
|
|
var fontData = [];
|
|
for (var i = 0; i < offsets.currentOffset; i++)
|
|
fontData.push(ttf[i]);
|
|
|
|
return fontData;
|
|
},
|
|
|
|
convert: function font_convert(fontName, font, properties) {
|
|
function isFixedPitch(glyphs) {
|
|
for (var i = 0; i < glyphs.length - 1; i++) {
|
|
if (glyphs[i] != glyphs[i + 1])
|
|
return false;
|
|
}
|
|
return true;
|
|
};
|
|
|
|
// The offsets object holds at the same time a representation of where
|
|
// to write the table entry information about a table and another offset
|
|
// representing the offset where to draw the actual data of a particular
|
|
// table
|
|
var kRequiredTablesCount = 9;
|
|
var offsets = {
|
|
currentOffset: 0,
|
|
virtualOffset: 9 * (4 * 4)
|
|
};
|
|
|
|
var otf = new Uint8Array(kMaxFontFileSize);
|
|
createOpenTypeHeader('\x4F\x54\x54\x4F', otf, offsets, 9);
|
|
|
|
var charstrings = font.charstrings;
|
|
properties.fixedPitch = isFixedPitch(charstrings);
|
|
|
|
var fields = {
|
|
// PostScript Font Program
|
|
'CFF ': font.data,
|
|
|
|
// OS/2 and Windows Specific metrics
|
|
'OS/2': stringToArray(createOS2Table(properties)),
|
|
|
|
// Character to glyphs mapping
|
|
'cmap': createCMapTable(charstrings.slice(), font.glyphIds),
|
|
|
|
// Font header
|
|
'head': (function() {
|
|
return stringToArray(
|
|
'\x00\x01\x00\x00' + // Version number
|
|
'\x00\x00\x10\x00' + // fontRevision
|
|
'\x00\x00\x00\x00' + // checksumAdjustement
|
|
'\x5F\x0F\x3C\xF5' + // magicNumber
|
|
'\x00\x00' + // Flags
|
|
'\x03\xE8' + // unitsPerEM (defaulting to 1000)
|
|
'\x00\x00\x00\x00\x9e\x0b\x7e\x27' + // creation date
|
|
'\x00\x00\x00\x00\x9e\x0b\x7e\x27' + // modifification date
|
|
'\x00\x00' + // xMin
|
|
string16(properties.descent) + // yMin
|
|
'\x0F\xFF' + // xMax
|
|
string16(properties.ascent) + // yMax
|
|
string16(properties.italicAngle ? 2 : 0) + // macStyle
|
|
'\x00\x11' + // lowestRecPPEM
|
|
'\x00\x00' + // fontDirectionHint
|
|
'\x00\x00' + // indexToLocFormat
|
|
'\x00\x00'); // glyphDataFormat
|
|
})(),
|
|
|
|
// Horizontal header
|
|
'hhea': (function() {
|
|
return stringToArray(
|
|
'\x00\x01\x00\x00' + // Version number
|
|
string16(properties.ascent) + // Typographic Ascent
|
|
string16(properties.descent) + // Typographic Descent
|
|
'\x00\x00' + // Line Gap
|
|
'\xFF\xFF' + // advanceWidthMax
|
|
'\x00\x00' + // minLeftSidebearing
|
|
'\x00\x00' + // minRightSidebearing
|
|
'\x00\x00' + // xMaxExtent
|
|
string16(properties.capHeight) + // caretSlopeRise
|
|
string16(Math.tan(properties.italicAngle) *
|
|
properties.xHeight) + // caretSlopeRun
|
|
'\x00\x00' + // caretOffset
|
|
'\x00\x00' + // -reserved-
|
|
'\x00\x00' + // -reserved-
|
|
'\x00\x00' + // -reserved-
|
|
'\x00\x00' + // -reserved-
|
|
'\x00\x00' + // metricDataFormat
|
|
string16(charstrings.length + 1)); // Number of HMetrics
|
|
})(),
|
|
|
|
// Horizontal metrics
|
|
'hmtx': (function() {
|
|
var hmtx = '\x00\x00\x00\x00'; // Fake .notdef
|
|
for (var i = 0; i < charstrings.length; i++) {
|
|
hmtx += string16(charstrings[i].width) + string16(0);
|
|
}
|
|
return stringToArray(hmtx);
|
|
})(),
|
|
|
|
// Maximum profile
|
|
'maxp': (function() {
|
|
return stringToArray(
|
|
'\x00\x00\x50\x00' + // Version number
|
|
string16(charstrings.length + 1)); // Num of glyphs
|
|
})(),
|
|
|
|
// Naming tables
|
|
'name': stringToArray(createNameTable(fontName)),
|
|
|
|
// PostScript informations
|
|
'post': stringToArray(createPostTable(properties))
|
|
};
|
|
|
|
for (var field in fields)
|
|
createTableEntry(otf, offsets, field, fields[field]);
|
|
|
|
for (var field in fields) {
|
|
var table = fields[field];
|
|
otf.set(table, offsets.currentOffset);
|
|
offsets.currentOffset += table.length;
|
|
}
|
|
|
|
var fontData = [];
|
|
for (var i = 0; i < offsets.currentOffset; i++)
|
|
fontData.push(otf[i]);
|
|
return fontData;
|
|
},
|
|
|
|
bindWorker: function font_bindWorker(data) {
|
|
postMessage({
|
|
action: 'font',
|
|
data: {
|
|
raw: data,
|
|
fontName: this.loadedName,
|
|
mimetype: this.mimetype
|
|
}
|
|
});
|
|
},
|
|
|
|
bindDOM: function font_bindDom(data) {
|
|
var fontName = this.loadedName;
|
|
|
|
// Add the font-face rule to the document
|
|
var url = ('url(data:' + this.mimetype + ';base64,' +
|
|
window.btoa(data) + ');');
|
|
var rule = "@font-face { font-family:'" + fontName + "';src:" + url + '}';
|
|
var styleSheet = document.styleSheets[0];
|
|
styleSheet.insertRule(rule, styleSheet.cssRules.length);
|
|
|
|
return rule;
|
|
},
|
|
|
|
charsToUnicode: function fonts_chars2Unicode(chars) {
|
|
var charsCache = this.charsCache;
|
|
var str;
|
|
|
|
// if we translated this string before, just grab it from the cache
|
|
if (charsCache) {
|
|
str = charsCache[chars];
|
|
if (str)
|
|
return str;
|
|
}
|
|
|
|
// lazily create the translation cache
|
|
if (!charsCache)
|
|
charsCache = this.charsCache = Object.create(null);
|
|
|
|
if (this.compositeFont) {
|
|
// composite fonts have multi-byte strings
|
|
// convert the string from single-byte to multi-byte
|
|
// XXX assuming CIDFonts are two-byte - later need to extract the correct byte encoding
|
|
// according to the PDF spec
|
|
str = '';
|
|
var multiByteStr = "";
|
|
var length = chars.length;
|
|
for (var i = 0; i < length; i++) {
|
|
var byte1 = chars.charCodeAt(i++) & 0xFF;
|
|
var byte2;
|
|
if (i == length)
|
|
byte2 = 0;
|
|
else
|
|
byte2 = chars.charCodeAt(i) & 0xFF;
|
|
multiByteStr += String.fromCharCode((byte1 << 8) | byte2);
|
|
}
|
|
str = multiByteStr;
|
|
}
|
|
else {
|
|
// translate the string using the font's encoding
|
|
var encoding = this.encoding;
|
|
if (!encoding)
|
|
return chars;
|
|
|
|
str = '';
|
|
for (var i = 0; i < chars.length; ++i) {
|
|
var charcode = chars.charCodeAt(i);
|
|
var unicode = encoding[charcode];
|
|
if ('undefined' == typeof(unicode)) {
|
|
// FIXME/issue 233: we're hitting this in test/pdf/sizes.pdf
|
|
// at the moment, for unknown reasons.
|
|
warn('Unencoded charcode '+ charcode);
|
|
unicode = charcode;
|
|
}
|
|
|
|
// Check if the glyph has already been converted
|
|
if (!IsNum(unicode))
|
|
unicode = encoding[unicode] = GlyphsUnicode[unicode.name];
|
|
|
|
// Handle surrogate pairs
|
|
if (unicode > 0xFFFF) {
|
|
str += String.fromCharCode(unicode & 0xFFFF);
|
|
unicode >>= 16;
|
|
}
|
|
str += String.fromCharCode(unicode);
|
|
}
|
|
}
|
|
|
|
// Enter the translated string into the cache
|
|
return charsCache[chars] = str;
|
|
}
|
|
};
|
|
|
|
return constructor;
|
|
})();
|
|
|
|
/**
|
|
* Type1Parser encapsulate the needed code for parsing a Type1 font
|
|
* program. Some of its logic depends on the Type2 charstrings
|
|
* structure.
|
|
*/
|
|
var Type1Parser = function() {
|
|
/*
|
|
* Decrypt a Sequence of Ciphertext Bytes to Produce the Original Sequence
|
|
* of Plaintext Bytes. The function took a key as a parameter which can be
|
|
* for decrypting the eexec block of for decoding charStrings.
|
|
*/
|
|
var kEexecEncryptionKey = 55665;
|
|
var kCharStringsEncryptionKey = 4330;
|
|
|
|
function decrypt(stream, key, discardNumber) {
|
|
var r = key, c1 = 52845, c2 = 22719;
|
|
var decryptedString = [];
|
|
|
|
var value = '';
|
|
var count = stream.length;
|
|
for (var i = 0; i < count; i++) {
|
|
value = stream[i];
|
|
decryptedString[i] = value ^ (r >> 8);
|
|
r = ((value + r) * c1 + c2) & ((1 << 16) - 1);
|
|
}
|
|
return decryptedString.slice(discardNumber);
|
|
};
|
|
|
|
/*
|
|
* CharStrings are encoded following the the CharString Encoding sequence
|
|
* describe in Chapter 6 of the "Adobe Type1 Font Format" specification.
|
|
* The value in a byte indicates a command, a number, or subsequent bytes
|
|
* that are to be interpreted in a special way.
|
|
*
|
|
* CharString Number Encoding:
|
|
* A CharString byte containing the values from 32 through 255 inclusive
|
|
* indicate an integer. These values are decoded in four ranges.
|
|
*
|
|
* 1. A CharString byte containing a value, v, between 32 and 246 inclusive,
|
|
* indicate the integer v - 139. Thus, the integer values from -107 through
|
|
* 107 inclusive may be encoded in single byte.
|
|
*
|
|
* 2. A CharString byte containing a value, v, between 247 and 250 inclusive,
|
|
* indicates an integer involving the next byte, w, according to the formula:
|
|
* [(v - 247) x 256] + w + 108
|
|
*
|
|
* 3. A CharString byte containing a value, v, between 251 and 254 inclusive,
|
|
* indicates an integer involving the next byte, w, according to the formula:
|
|
* -[(v - 251) * 256] - w - 108
|
|
*
|
|
* 4. A CharString containing the value 255 indicates that the next 4 bytes
|
|
* are a two complement signed integer. The first of these bytes contains the
|
|
* highest order bits, the second byte contains the next higher order bits
|
|
* and the fourth byte contain the lowest order bits.
|
|
*
|
|
*
|
|
* CharString Command Encoding:
|
|
* CharStrings commands are encoded in 1 or 2 bytes.
|
|
*
|
|
* Single byte commands are encoded in 1 byte that contains a value between
|
|
* 0 and 31 inclusive.
|
|
* If a command byte contains the value 12, then the value in the next byte
|
|
* indicates a command. This "escape" mechanism allows many extra commands
|
|
* to be encoded and this encoding technique helps to minimize the length of
|
|
* the charStrings.
|
|
*/
|
|
var charStringDictionary = {
|
|
'1': 'hstem',
|
|
'3': 'vstem',
|
|
'4': 'vmoveto',
|
|
'5': 'rlineto',
|
|
'6': 'hlineto',
|
|
'7': 'vlineto',
|
|
'8': 'rrcurveto',
|
|
|
|
// closepath is a Type1 command that do not take argument and is useless
|
|
// in Type2 and it can simply be ignored.
|
|
'9': null, // closepath
|
|
|
|
'10': 'callsubr',
|
|
|
|
// return is normally used inside sub-routines to tells to the execution
|
|
// flow that it can be back to normal.
|
|
// During the translation process Type1 charstrings will be flattened and
|
|
// sub-routines will be embedded directly into the charstring directly, so
|
|
// this can be ignored safely.
|
|
'11': 'return',
|
|
|
|
'12': {
|
|
// dotsection is a Type1 command to specify some hinting feature for dots
|
|
// that do not take a parameter and it can safely be ignored for Type2.
|
|
'0': null, // dotsection
|
|
|
|
// [vh]stem3 are Type1 only and Type2 supports [vh]stem with multiple
|
|
// parameters, so instead of returning [vh]stem3 take a shortcut and
|
|
// return [vhstem] instead.
|
|
'1': 'vstem',
|
|
'2': 'hstem',
|
|
|
|
// Type1 only command with command not (yet) built-in ,throw an error
|
|
'6': -1, // seac
|
|
'7': -1, //sbw
|
|
|
|
'11': 'sub',
|
|
'12': 'div',
|
|
|
|
// callothersubr is a mechanism to make calls on the postscript
|
|
// interpreter, this is not supported by Type2 charstring but hopefully
|
|
// most of the default commands can be ignored safely.
|
|
'16': 'callothersubr',
|
|
|
|
'17': 'pop',
|
|
|
|
// setcurrentpoint sets the current point to x, y without performing a
|
|
// moveto (this is a one shot positionning command). This is used only
|
|
// with the return of an OtherSubrs call.
|
|
// TODO Implement the OtherSubrs charstring embedding and replace this
|
|
// call by a no-op, like 2 'pop' commands for example.
|
|
'33': null //setcurrentpoint
|
|
},
|
|
'13': 'hsbw',
|
|
'14': 'endchar',
|
|
'21': 'rmoveto',
|
|
'22': 'hmoveto',
|
|
'30': 'vhcurveto',
|
|
'31': 'hvcurveto'
|
|
};
|
|
|
|
var kEscapeCommand = 12;
|
|
|
|
function decodeCharString(array) {
|
|
var charstring = [];
|
|
var lsb = 0;
|
|
var width = 0;
|
|
var used = false;
|
|
|
|
var value = '';
|
|
var count = array.length;
|
|
for (var i = 0; i < count; i++) {
|
|
value = parseInt(array[i]);
|
|
|
|
if (value < 32) {
|
|
var command = null;
|
|
if (value == kEscapeCommand) {
|
|
var escape = array[++i];
|
|
|
|
// TODO Clean this code
|
|
if (escape == 16) {
|
|
var index = charstring.pop();
|
|
var argc = charstring.pop();
|
|
var data = charstring.pop();
|
|
|
|
// If the flex mechanishm is not used in a font program, Adobe
|
|
// state that that entries 0, 1 and 2 can simply be replace by
|
|
// {}, which means that we can simply ignore them.
|
|
if (index < 3) {
|
|
continue;
|
|
}
|
|
|
|
// This is the same things about hint replacement, if it is not used
|
|
// entry 3 can be replaced by {3}
|
|
if (index == 3) {
|
|
charstring.push(3);
|
|
i++;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
command = charStringDictionary['12'][escape];
|
|
} else {
|
|
// TODO Clean this code
|
|
if (value == 13) {
|
|
if (charstring.length == 2) {
|
|
width = charstring[1];
|
|
} else if (charstring.length == 4 && charstring[3] == 'div') {
|
|
width = charstring[1] / charstring[2];
|
|
} else {
|
|
error('Unsupported hsbw format: ' + charstring);
|
|
}
|
|
|
|
lsb = charstring[0];
|
|
charstring.push(lsb, 'hmoveto');
|
|
charstring.splice(0, 1);
|
|
continue;
|
|
}
|
|
command = charStringDictionary[value];
|
|
}
|
|
|
|
// Some charstring commands are meaningless in Type2 and will return
|
|
// a null, let's just ignored them
|
|
if (!command && i < count) {
|
|
continue;
|
|
} else if (!command) {
|
|
break;
|
|
} else if (command == -1) {
|
|
error('Support for Type1 command ' + value +
|
|
' (' + escape + ') is not implemented in charstring: ' +
|
|
charString);
|
|
}
|
|
|
|
value = command;
|
|
} else if (value <= 246) {
|
|
value = parseInt(value) - 139;
|
|
} else if (value <= 250) {
|
|
value = ((value - 247) * 256) + parseInt(array[++i]) + 108;
|
|
} else if (value <= 254) {
|
|
value = -((value - 251) * 256) - parseInt(array[++i]) - 108;
|
|
} else {
|
|
value = (array[++i] & 0xff) << 24 | (array[++i] & 0xff) << 16 |
|
|
(array[++i] & 0xff) << 8 | (array[++i] & 0xff) << 0;
|
|
}
|
|
|
|
charstring.push(value);
|
|
}
|
|
|
|
return { charstring: charstring, width: width, lsb: lsb };
|
|
};
|
|
|
|
/**
|
|
* Returns an object containing a Subrs array and a CharStrings
|
|
* array extracted from and eexec encrypted block of data
|
|
*/
|
|
function readNumberArray(str, index) {
|
|
var start = ++index;
|
|
var count = 0;
|
|
while (str[index++] != ']')
|
|
count++;
|
|
|
|
var array = str.substr(start, count).split(' ');
|
|
for (var i = 0; i < array.length; i++)
|
|
array[i] = parseFloat(array[i] || 0);
|
|
return array;
|
|
};
|
|
|
|
function readNumber(str, index) {
|
|
while (str[index++] == ' ')
|
|
;
|
|
var start = index;
|
|
|
|
var count = 0;
|
|
while (str[index++] != ' ')
|
|
count++;
|
|
|
|
return parseFloat(str.substr(start, count) || 0);
|
|
};
|
|
|
|
this.extractFontProgram = function t1_extractFontProgram(stream) {
|
|
var eexec = decrypt(stream, kEexecEncryptionKey, 4);
|
|
var eexecStr = '';
|
|
for (var i = 0; i < eexec.length; i++)
|
|
eexecStr += String.fromCharCode(eexec[i]);
|
|
|
|
var glyphsSection = false, subrsSection = false;
|
|
var program = {
|
|
subrs: [],
|
|
charstrings: [],
|
|
properties: {
|
|
'private': {}
|
|
}
|
|
};
|
|
|
|
var glyph = '';
|
|
var token = '';
|
|
var length = 0;
|
|
|
|
var c = '';
|
|
var count = eexecStr.length;
|
|
for (var i = 0; i < count; i++) {
|
|
var c = eexecStr[i];
|
|
|
|
if ((glyphsSection || subrsSection) && c == 'R') {
|
|
var data = eexec.slice(i + 3, i + 3 + length);
|
|
var encoded = decrypt(data, kCharStringsEncryptionKey, 4);
|
|
var str = decodeCharString(encoded);
|
|
|
|
if (glyphsSection) {
|
|
program.charstrings.push({
|
|
glyph: glyph,
|
|
data: str.charstring,
|
|
lsb: str.lsb,
|
|
width: str.width
|
|
});
|
|
} else {
|
|
program.subrs.push(str.charstring);
|
|
}
|
|
i += length + 3;
|
|
} else if (c == ' ' || c == '\n') {
|
|
length = parseInt(token);
|
|
token = '';
|
|
} else {
|
|
token += c;
|
|
if (!glyphsSection) {
|
|
switch (token) {
|
|
case '/CharString':
|
|
glyphsSection = true;
|
|
break;
|
|
case '/Subrs':
|
|
subrsSection = true;
|
|
break;
|
|
case '/BlueValues':
|
|
case '/OtherBlues':
|
|
case '/FamilyBlues':
|
|
case '/FamilyOtherBlues':
|
|
case '/StemSnapH':
|
|
case '/StemSnapV':
|
|
program.properties.private[token.substring(1)] = readNumberArray(eexecStr, i + 2);
|
|
break;
|
|
case '/StdHW':
|
|
case '/StdVW':
|
|
program.properties.private[token.substring(1)] = readNumberArray(eexecStr, i + 2)[0];
|
|
break;
|
|
case '/BlueShift':
|
|
case '/BlueFuzz':
|
|
case '/BlueScale':
|
|
case '/LanguageGroup':
|
|
case '/ExpansionFactor':
|
|
program.properties.private[token.substring(1)] = readNumber(eexecStr, i + 1);
|
|
break;
|
|
}
|
|
} else if (c == '/') {
|
|
token = glyph = '';
|
|
while ((c = eexecStr[++i]) != ' ')
|
|
glyph += c;
|
|
}
|
|
}
|
|
}
|
|
|
|
return program;
|
|
},
|
|
|
|
this.extractFontHeader = function t1_extractFontProgram(stream) {
|
|
var headerString = '';
|
|
for (var i = 0; i < stream.length; i++)
|
|
headerString += String.fromCharCode(stream[i]);
|
|
|
|
var info = {
|
|
textMatrix: null
|
|
};
|
|
|
|
var token = '';
|
|
var count = headerString.length;
|
|
for (var i = 0; i < count; i++) {
|
|
var c = headerString[i];
|
|
if (c == ' ' || c == '\n') {
|
|
switch (token) {
|
|
case '/FontMatrix':
|
|
var matrix = readNumberArray(headerString, i + 1);
|
|
|
|
// The FontMatrix is in unitPerEm, so make it pixels
|
|
for (var j = 0; j < matrix.length; j++)
|
|
matrix[j] *= 1000;
|
|
|
|
// Make the angle into the right direction
|
|
matrix[2] *= -1;
|
|
|
|
info.textMatrix = matrix;
|
|
break;
|
|
}
|
|
token = '';
|
|
} else {
|
|
token += c;
|
|
}
|
|
}
|
|
|
|
return info;
|
|
};
|
|
};
|
|
|
|
/**
|
|
* The CFF class takes a Type1 file and wrap it into a 'Compact Font Format',
|
|
* which itself embed Type2 charstrings.
|
|
*/
|
|
var CFFStrings = [
|
|
'.notdef', 'space', 'exclam', 'quotedbl', 'numbersign', 'dollar', 'percent',
|
|
'ampersand', 'quoteright', 'parenleft', 'parenright', 'asterisk', 'plus',
|
|
'comma', 'hyphen', 'period', 'slash', 'zero', 'one', 'two', 'three', 'four',
|
|
'five', 'six', 'seven', 'eight', 'nine', 'colon', 'semicolon', 'less',
|
|
'equal', 'greater', 'question', 'at', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
|
|
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
|
|
'X', 'Y', 'Z', 'bracketleft', 'backslash', 'bracketright', 'asciicircum',
|
|
'underscore', 'quoteleft', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
|
|
'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y',
|
|
'z', 'braceleft', 'bar', 'braceright', 'asciitilde', 'exclamdown', 'cent',
|
|
'sterling', 'fraction', 'yen', 'florin', 'section', 'currency',
|
|
'quotesingle', 'quotedblleft', 'guillemotleft', 'guilsinglleft',
|
|
'guilsinglright', 'fi', 'fl', 'endash', 'dagger', 'daggerdbl',
|
|
'periodcentered', 'paragraph', 'bullet', 'quotesinglbase', 'quotedblbase',
|
|
'quotedblright', 'guillemotright', 'ellipsis', 'perthousand', 'questiondown',
|
|
'grave', 'acute', 'circumflex', 'tilde', 'macron', 'breve', 'dotaccent',
|
|
'dieresis', 'ring', 'cedilla', 'hungarumlaut', 'ogonek', 'caron', 'emdash',
|
|
'AE', 'ordfeminine', 'Lslash', 'Oslash', 'OE', 'ordmasculine', 'ae',
|
|
'dotlessi', 'lslash', 'oslash', 'oe', 'germandbls', 'onesuperior',
|
|
'logicalnot', 'mu', 'trademark', 'Eth', 'onehalf', 'plusminus', 'Thorn',
|
|
'onequarter', 'divide', 'brokenbar', 'degree', 'thorn', 'threequarters',
|
|
'twosuperior', 'registered', 'minus', 'eth', 'multiply', 'threesuperior',
|
|
'copyright', 'Aacute', 'Acircumflex', 'Adieresis', 'Agrave', 'Aring',
|
|
'Atilde', 'Ccedilla', 'Eacute', 'Ecircumflex', 'Edieresis', 'Egrave',
|
|
'Iacute', 'Icircumflex', 'Idieresis', 'Igrave', 'Ntilde', 'Oacute',
|
|
'Ocircumflex', 'Odieresis', 'Ograve', 'Otilde', 'Scaron', 'Uacute',
|
|
'Ucircumflex', 'Udieresis', 'Ugrave', 'Yacute', 'Ydieresis', 'Zcaron',
|
|
'aacute', 'acircumflex', 'adieresis', 'agrave', 'aring', 'atilde',
|
|
'ccedilla', 'eacute', 'ecircumflex', 'edieresis', 'egrave', 'iacute',
|
|
'icircumflex', 'idieresis', 'igrave', 'ntilde', 'oacute', 'ocircumflex',
|
|
'odieresis', 'ograve', 'otilde', 'scaron', 'uacute', 'ucircumflex',
|
|
'udieresis', 'ugrave', 'yacute', 'ydieresis', 'zcaron', 'exclamsmall',
|
|
'Hungarumlautsmall', 'dollaroldstyle', 'dollarsuperior', 'ampersandsmall',
|
|
'Acutesmall', 'parenleftsuperior', 'parenrightsuperior', '266 ff',
|
|
'onedotenleader', 'zerooldstyle', 'oneoldstyle', 'twooldstyle',
|
|
'threeoldstyle', 'fouroldstyle', 'fiveoldstyle', 'sixoldstyle',
|
|
'sevenoldstyle', 'eightoldstyle', 'nineoldstyle', 'commasuperior',
|
|
'threequartersemdash', 'periodsuperior', 'questionsmall', 'asuperior',
|
|
'bsuperior', 'centsuperior', 'dsuperior', 'esuperior', 'isuperior',
|
|
'lsuperior', 'msuperior', 'nsuperior', 'osuperior', 'rsuperior', 'ssuperior',
|
|
'tsuperior', 'ff', 'ffi', 'ffl', 'parenleftinferior', 'parenrightinferior',
|
|
'Circumflexsmall', 'hyphensuperior', 'Gravesmall', 'Asmall', 'Bsmall',
|
|
'Csmall', 'Dsmall', 'Esmall', 'Fsmall', 'Gsmall', 'Hsmall', 'Ismall',
|
|
'Jsmall', 'Ksmall', 'Lsmall', 'Msmall', 'Nsmall', 'Osmall', 'Psmall',
|
|
'Qsmall', 'Rsmall', 'Ssmall', 'Tsmall', 'Usmall', 'Vsmall', 'Wsmall',
|
|
'Xsmall', 'Ysmall', 'Zsmall', 'colonmonetary', 'onefitted', 'rupiah',
|
|
'Tildesmall', 'exclamdownsmall', 'centoldstyle', 'Lslashsmall',
|
|
'Scaronsmall', 'Zcaronsmall', 'Dieresissmall', 'Brevesmall', 'Caronsmall',
|
|
'Dotaccentsmall', 'Macronsmall', 'figuredash', 'hypheninferior',
|
|
'Ogoneksmall', 'Ringsmall', 'Cedillasmall', 'questiondownsmall', 'oneeighth',
|
|
'threeeighths', 'fiveeighths', 'seveneighths', 'onethird', 'twothirds',
|
|
'zerosuperior', 'foursuperior', 'fivesuperior', 'sixsuperior',
|
|
'sevensuperior', 'eightsuperior', 'ninesuperior', 'zeroinferior',
|
|
'oneinferior', 'twoinferior', 'threeinferior', 'fourinferior',
|
|
'fiveinferior', 'sixinferior', 'seveninferior', 'eightinferior',
|
|
'nineinferior', 'centinferior', 'dollarinferior', 'periodinferior',
|
|
'commainferior', 'Agravesmall', 'Aacutesmall', 'Acircumflexsmall',
|
|
'Atildesmall', 'Adieresissmall', 'Aringsmall', 'AEsmall', 'Ccedillasmall',
|
|
'Egravesmall', 'Eacutesmall', 'Ecircumflexsmall', 'Edieresissmall',
|
|
'Igravesmall', 'Iacutesmall', 'Icircumflexsmall', 'Idieresissmall',
|
|
'Ethsmall', 'Ntildesmall', 'Ogravesmall', 'Oacutesmall', 'Ocircumflexsmall',
|
|
'Otildesmall', 'Odieresissmall', 'OEsmall', 'Oslashsmall', 'Ugravesmall',
|
|
'Uacutesmall', 'Ucircumflexsmall', 'Udieresissmall', 'Yacutesmall',
|
|
'Thornsmall', 'Ydieresissmall', '001.000', '001.001', '001.002', '001.003',
|
|
'Black', 'Bold', 'Book', 'Light', 'Medium', 'Regular', 'Roman', 'Semibold'
|
|
];
|
|
|
|
var type1Parser = new Type1Parser();
|
|
|
|
var CFF = function(name, file, properties) {
|
|
// Get the data block containing glyphs and subrs informations
|
|
var length1 = file.dict.get('Length1');
|
|
var length2 = file.dict.get('Length2');
|
|
|
|
var headerBlock = file.getBytes(length1);
|
|
var header = type1Parser.extractFontHeader(headerBlock);
|
|
for (var info in header)
|
|
properties[info] = header[info];
|
|
|
|
// Decrypt the data blocks and retrieve it's content
|
|
var eexecBlock = file.getBytes(length2);
|
|
var data = type1Parser.extractFontProgram(eexecBlock);
|
|
for (var info in data.properties)
|
|
properties[info] = data.properties[info];
|
|
|
|
var charstrings = this.getOrderedCharStrings(data.charstrings);
|
|
var type2Charstrings = this.getType2Charstrings(charstrings);
|
|
var subrs = this.getType2Subrs(data.subrs);
|
|
|
|
this.charstrings = charstrings;
|
|
this.data = this.wrap(name, type2Charstrings, this.charstrings,
|
|
subrs, properties);
|
|
};
|
|
|
|
CFF.prototype = {
|
|
createCFFIndexHeader: function cff_createCFFIndexHeader(objects, isByte) {
|
|
// First 2 bytes contains the number of objects contained into this index
|
|
var count = objects.length;
|
|
|
|
// If there is no object, just create an array saying that with another
|
|
// offset byte.
|
|
if (count == 0)
|
|
return '\x00\x00\x00';
|
|
|
|
var data = String.fromCharCode(count >> 8, count & 0xff);
|
|
|
|
// Next byte contains the offset size use to reference object in the file
|
|
// Actually we're using 0x04 to be sure to be able to store everything
|
|
// without thinking of it while coding.
|
|
data += '\x04';
|
|
|
|
// Add another offset after this one because we need a new offset
|
|
var relativeOffset = 1;
|
|
for (var i = 0; i < count + 1; i++) {
|
|
data += String.fromCharCode((relativeOffset >>> 24) & 0xFF, (relativeOffset >> 16) & 0xFF,
|
|
(relativeOffset >> 8) & 0xFF, relativeOffset & 0xFF);
|
|
|
|
if (objects[i])
|
|
relativeOffset += objects[i].length;
|
|
}
|
|
|
|
for (var i = 0; i < count; i++) {
|
|
for (var j = 0; j < objects[i].length; j++)
|
|
data += isByte ? String.fromCharCode(objects[i][j] & 0xFF) : objects[i][j];
|
|
}
|
|
return data;
|
|
},
|
|
|
|
encodeNumber: function cff_encodeNumber(value) {
|
|
if (value >= -32768 && value <= 32767) {
|
|
return '\x1c' +
|
|
String.fromCharCode((value >> 8) & 0xFF) +
|
|
String.fromCharCode(value & 0xFF);
|
|
} else if (value >= (-2147483648) && value <= 2147483647) {
|
|
value ^= 0xffffffff;
|
|
value += 1;
|
|
return '\xff' +
|
|
String.fromCharCode((value >> 24) & 0xFF) +
|
|
String.fromCharCode((value >> 16) & 0xFF) +
|
|
String.fromCharCode((value >> 8) & 0xFF) +
|
|
String.fromCharCode(value & 0xFF);
|
|
}
|
|
error('Value: ' + value + ' is not allowed');
|
|
return null;
|
|
},
|
|
|
|
getOrderedCharStrings: function cff_getOrderedCharStrings(glyphs) {
|
|
var charstrings = [];
|
|
|
|
for (var i = 0; i < glyphs.length; i++) {
|
|
var glyph = glyphs[i];
|
|
var unicode = GlyphsUnicode[glyph.glyph];
|
|
if (!unicode) {
|
|
if (glyph.glyph != '.notdef') {
|
|
warn(glyph.glyph +
|
|
' does not have an entry in the glyphs unicode dictionary');
|
|
}
|
|
} else {
|
|
charstrings.push({
|
|
glyph: glyph,
|
|
unicode: unicode,
|
|
charstring: glyph.data,
|
|
width: glyph.width,
|
|
lsb: glyph.lsb
|
|
});
|
|
}
|
|
}
|
|
|
|
charstrings.sort(function charstrings_sort(a, b) {
|
|
return a.unicode - b.unicode;
|
|
});
|
|
return charstrings;
|
|
},
|
|
|
|
getType2Charstrings: function cff_getType2Charstrings(type1Charstrings) {
|
|
var type2Charstrings = [];
|
|
var count = type1Charstrings.length;
|
|
for (var i = 0; i < count; i++) {
|
|
var charstring = type1Charstrings[i].charstring;
|
|
type2Charstrings.push(this.flattenCharstring(charstring.slice(),
|
|
this.commandsMap));
|
|
}
|
|
return type2Charstrings;
|
|
},
|
|
|
|
getType2Subrs: function cff_getType2Charstrings(type1Subrs) {
|
|
var bias = 0;
|
|
var count = type1Subrs.length;
|
|
if (count < 1240)
|
|
bias = 107;
|
|
else if (count < 33900)
|
|
bias = 1131;
|
|
else
|
|
bias = 32768;
|
|
|
|
// Add a bunch of empty subrs to deal with the Type2 bias
|
|
var type2Subrs = [];
|
|
for (var i = 0; i < bias; i++)
|
|
type2Subrs.push([0x0B]);
|
|
|
|
for (var i = 0; i < count; i++)
|
|
type2Subrs.push(this.flattenCharstring(type1Subrs[i], this.commandsMap));
|
|
|
|
return type2Subrs;
|
|
},
|
|
|
|
/*
|
|
* Flatten the commands by interpreting the postscript code and replacing
|
|
* every 'callsubr', 'callothersubr' by the real commands.
|
|
*/
|
|
commandsMap: {
|
|
'hstem': 1,
|
|
'vstem': 3,
|
|
'vmoveto': 4,
|
|
'rlineto': 5,
|
|
'hlineto': 6,
|
|
'vlineto': 7,
|
|
'rrcurveto': 8,
|
|
'callsubr': 10,
|
|
'return': 11,
|
|
'sub': [12, 11],
|
|
'div': [12, 12],
|
|
'pop': [1, 12, 18],
|
|
'endchar': 14,
|
|
'rmoveto': 21,
|
|
'hmoveto': 22,
|
|
'vhcurveto': 30,
|
|
'hvcurveto': 31
|
|
},
|
|
|
|
flattenCharstring: function flattenCharstring(charstring, map) {
|
|
for (var i = 0; i < charstring.length; i++) {
|
|
var command = charstring[i];
|
|
if (command.charAt) {
|
|
var cmd = map[command];
|
|
assert(cmd, 'Unknow command: ' + command);
|
|
|
|
if (IsArray(cmd)) {
|
|
charstring.splice(i++, 1, cmd[0], cmd[1]);
|
|
} else {
|
|
charstring[i] = cmd;
|
|
}
|
|
} else {
|
|
// Type1 charstring use a division for number above 32000
|
|
if (command > 32000) {
|
|
var divisor = charstring[i + 1];
|
|
command /= divisor;
|
|
charstring.splice(i, 3, 28, command >> 8, command & 0xff);
|
|
} else {
|
|
charstring.splice(i, 1, 28, command >> 8, command & 0xff);
|
|
}
|
|
i += 2;
|
|
}
|
|
}
|
|
return charstring;
|
|
},
|
|
|
|
wrap: function wrap(name, glyphs, charstrings, subrs, properties) {
|
|
var fields = {
|
|
// major version, minor version, header size, offset size
|
|
'header': '\x01\x00\x04\x04',
|
|
|
|
'names': this.createCFFIndexHeader([name]),
|
|
|
|
'topDict': (function topDict(self) {
|
|
return function() {
|
|
var dict =
|
|
'\x00\x01\x01\x01\x30' +
|
|
'\xf8\x1b\x00' + // version
|
|
'\xf8\x1c\x01' + // Notice
|
|
'\xf8\x1d\x02' + // FullName
|
|
'\xf8\x1e\x03' + // FamilyName
|
|
'\xf8\x1f\x04' + // Weight
|
|
'\x1c\x00\x00\x10'; // Encoding
|
|
|
|
var boundingBox = properties.bbox;
|
|
for (var i = 0; i < boundingBox.length; i++)
|
|
dict += self.encodeNumber(boundingBox[i]);
|
|
dict += '\x05'; // FontBBox;
|
|
|
|
var offset = fields.header.length +
|
|
fields.names.length +
|
|
(dict.length + (4 + 4 + 7)) +
|
|
fields.strings.length +
|
|
fields.globalSubrs.length;
|
|
dict += self.encodeNumber(offset) + '\x0f'; // Charset
|
|
|
|
offset = offset + (glyphs.length * 2) + 1;
|
|
dict += self.encodeNumber(offset) + '\x11'; // Charstrings
|
|
|
|
dict += self.encodeNumber(fields.private.length);
|
|
offset = offset + fields.charstrings.length;
|
|
dict += self.encodeNumber(offset) + '\x12'; // Private
|
|
|
|
return dict;
|
|
};
|
|
})(this),
|
|
|
|
'strings': (function strings(self) {
|
|
var strings = [
|
|
'Version 0.11', // Version
|
|
'See original notice', // Notice
|
|
name, // FullName
|
|
name, // FamilyName
|
|
'Medium' // Weight
|
|
];
|
|
return self.createCFFIndexHeader(strings);
|
|
})(this),
|
|
|
|
'globalSubrs': this.createCFFIndexHeader([]),
|
|
|
|
'charset': (function charset(self) {
|
|
var charset = '\x00'; // Encoding
|
|
|
|
var count = glyphs.length;
|
|
for (var i = 0; i < count; i++) {
|
|
var index = CFFStrings.indexOf(charstrings[i].glyph.glyph);
|
|
// Some characters like asterikmath && circlecopyrt are
|
|
// missing from the original strings, for the moment let's
|
|
// map them to .notdef and see later if it cause any
|
|
// problems
|
|
if (index == -1)
|
|
index = 0;
|
|
|
|
charset += String.fromCharCode(index >> 8, index & 0xff);
|
|
}
|
|
return charset;
|
|
})(this),
|
|
|
|
'charstrings': this.createCFFIndexHeader([[0x8B, 0x0E]].concat(glyphs),
|
|
true),
|
|
|
|
'private': (function(self) {
|
|
var data =
|
|
'\x8b\x14' + // defaultWidth
|
|
'\x8b\x15'; // nominalWidth
|
|
var fieldMap = {
|
|
BlueValues: '\x06',
|
|
OtherBlues: '\x07',
|
|
FamilyBlues: '\x08',
|
|
FamilyOtherBlues: '\x09',
|
|
StemSnapH: '\x0c\x0c',
|
|
StemSnapV: '\x0c\x0d',
|
|
BlueShift: '\x0c\x0a',
|
|
BlueFuzz: '\x0c\x0b',
|
|
BlueScale: '\x0c\x09',
|
|
LanguageGroup: '\x0c\x11',
|
|
ExpansionFactor: '\x0c\x18'
|
|
};
|
|
for (var field in fieldMap) {
|
|
if (!properties.private.hasOwnProperty(field)) continue;
|
|
var value = properties.private[field];
|
|
|
|
if (IsArray(value)) {
|
|
data += self.encodeNumber(value[0]);
|
|
for (var i = 1; i < value.length; i++)
|
|
data += self.encodeNumber(value[i] - value[i - 1]);
|
|
} else {
|
|
data += self.encodeNumber(value);
|
|
}
|
|
data += fieldMap[field];
|
|
}
|
|
|
|
data += self.encodeNumber(data.length + 4) + '\x13'; // Subrs offset
|
|
|
|
return data;
|
|
})(this),
|
|
|
|
'localSubrs': this.createCFFIndexHeader(subrs, true)
|
|
};
|
|
fields.topDict = fields.topDict();
|
|
|
|
|
|
var cff = [];
|
|
for (var index in fields) {
|
|
var field = fields[index];
|
|
for (var i = 0; i < field.length; i++)
|
|
cff.push(field.charCodeAt(i));
|
|
}
|
|
|
|
return cff;
|
|
}
|
|
};
|
|
|
|
var Type2CFF = (function() {
|
|
|
|
// TODO: replace parsing code with the Type2Parser in font_utils.js
|
|
function constructor(file, properties) {
|
|
var bytes = file.getBytes();
|
|
this.bytes = bytes;
|
|
this.properties = properties;
|
|
|
|
// Other classes expect this.data to be a Javascript array
|
|
var data = []
|
|
for (var i = 0, ii = bytes.length; i < ii; ++i)
|
|
data.push(bytes[i]);
|
|
this.data = data;
|
|
|
|
this.parse();
|
|
};
|
|
|
|
constructor.prototype = {
|
|
parse: function cff_parse() {
|
|
var header = this.parseHeader();
|
|
var nameIndex = this.parseIndex(header.endPos);
|
|
|
|
var dictIndex = this.parseIndex(nameIndex.endPos);
|
|
if (dictIndex.length != 1)
|
|
error('More than 1 font');
|
|
|
|
var stringIndex = this.parseIndex(dictIndex.endPos);
|
|
var gsubrIndex = this.parseIndex(stringIndex.endPos);
|
|
|
|
|
|
var strings = this.getStrings(stringIndex);
|
|
|
|
var baseDict = this.parseDict(dictIndex.get(0));
|
|
var topDict = this.getTopDict(baseDict, strings);
|
|
|
|
var bytes = this.bytes;
|
|
|
|
var privInfo = topDict['Private'];
|
|
var privOffset = privInfo[1], privLength = privInfo[0];
|
|
var privBytes = bytes.subarray(privOffset, privOffset + privLength);
|
|
baseDict = this.parseDict(privBytes);
|
|
var privDict = this.getPrivDict(baseDict, strings);
|
|
|
|
TODO('Parse encoding');
|
|
var charStrings = this.parseIndex(topDict['CharStrings']);
|
|
var charset = this.parseCharsets(topDict['charset'], charStrings.length,
|
|
strings);
|
|
|
|
// charstrings contains info about glyphs (one element per glyph
|
|
// containing mappings for {unicode, width})
|
|
var charstrings = this.getCharStrings(charset, charStrings,
|
|
privDict, this.properties);
|
|
|
|
// create the mapping between charstring and glyph id
|
|
var glyphIds = [];
|
|
for (var i = 0, ii = charstrings.length; i < ii; ++i) {
|
|
glyphIds.push(charstrings[i].gid);
|
|
}
|
|
|
|
this.charstrings = charstrings;
|
|
this.glyphIds = glyphIds;
|
|
},
|
|
getCharStrings: function cff_charstrings(charsets, charStrings,
|
|
privDict, properties) {
|
|
var widths = properties.widths;
|
|
|
|
var defaultWidth = privDict['defaultWidthX'];
|
|
var nominalWidth = privDict['nominalWidthX'];
|
|
|
|
var charstrings = [];
|
|
for (var i = 0, ii = charsets.length; i < ii; ++i) {
|
|
var charName = charsets[i];
|
|
var charCode = GlyphsUnicode[charName];
|
|
if (charCode) {
|
|
var width = widths[charCode] || defaultWidth;
|
|
charstrings.push({unicode: charCode, width: width, gid: i});
|
|
} else {
|
|
if (charName !== '.notdef')
|
|
warn('Cannot find unicode for glyph ' + charName);
|
|
}
|
|
}
|
|
|
|
// sort the arry by the unicode value
|
|
charstrings.sort(function(a, b) {return a.unicode - b.unicode});
|
|
return charstrings;
|
|
},
|
|
parseEncoding: function cff_parseencoding(pos) {
|
|
if (pos == 0) {
|
|
return Encodings.StandardEncoding;
|
|
} else if (pos == 1) {
|
|
return Encodings.ExpertEncoding;
|
|
}
|
|
|
|
error('not implemented encodings');
|
|
},
|
|
parseCharsets: function cff_parsecharsets(pos, length, strings) {
|
|
var bytes = this.bytes;
|
|
var format = bytes[pos++];
|
|
var charset = ['.notdef'];
|
|
// subtract 1 for the .notdef glyph
|
|
length -= 1;
|
|
|
|
switch (format) {
|
|
case 0:
|
|
for (var i = 0; i < length; ++i) {
|
|
var id = bytes[pos++];
|
|
id = (id << 8) | bytes[pos++];
|
|
charset.push(strings[id]);
|
|
}
|
|
return charset;
|
|
case 1:
|
|
while (charset.length <= length) {
|
|
var first = bytes[pos++];
|
|
first = (first << 8) | bytes[pos++];
|
|
var numLeft = bytes[pos++];
|
|
for (var i = 0; i <= numLeft; ++i)
|
|
charset.push(strings[first++]);
|
|
}
|
|
return charset;
|
|
case 2:
|
|
while (charset.length <= length) {
|
|
var first = bytes[pos++];
|
|
first = (first << 8) | bytes[pos++];
|
|
var numLeft = bytes[pos++];
|
|
numLeft = (numLeft << 8) | bytes[pos++];
|
|
for (var i = 0; i <= numLeft; ++i)
|
|
charset.push(strings[first++]);
|
|
}
|
|
return charset;
|
|
default:
|
|
error('Unknown charset format');
|
|
}
|
|
|
|
},
|
|
getPrivDict: function cff_getprivdict(baseDict, strings) {
|
|
var dict = {};
|
|
|
|
// default values
|
|
dict['defaultWidthX'] = 0;
|
|
dict['nominalWidthX'] = 0;
|
|
|
|
for (var i = 0, ii = baseDict.length; i < ii; ++i) {
|
|
var pair = baseDict[i];
|
|
var key = pair[0];
|
|
var value = pair[1];
|
|
switch(key) {
|
|
case 20:
|
|
dict['defaultWidthX'] = value[0];
|
|
case 21:
|
|
dict['nominalWidthX'] = value[0];
|
|
default:
|
|
TODO('interpret top dict key');
|
|
}
|
|
}
|
|
return dict;
|
|
},
|
|
getTopDict: function cff_gettopdict(baseDict, strings) {
|
|
var dict = {};
|
|
|
|
// default values
|
|
dict['Encoding'] = 0;
|
|
dict['charset'] = 0;
|
|
|
|
for (var i = 0, ii = baseDict.length; i < ii; ++i) {
|
|
var pair = baseDict[i];
|
|
var key = pair[0];
|
|
var value = pair[1];
|
|
switch(key) {
|
|
case 1:
|
|
dict['Notice'] = strings[value[0]];
|
|
break;
|
|
case 4:
|
|
dict['Weight'] = strings[value[0]];
|
|
break;
|
|
case 3094:
|
|
dict['BaseFontName'] = strings[value[0]];
|
|
break;
|
|
case 5:
|
|
dict['FontBBox'] = value;
|
|
break;
|
|
case 13:
|
|
dict['UniqueID'] = value[0];
|
|
break;
|
|
case 15:
|
|
dict['charset'] = value[0];
|
|
break;
|
|
case 16:
|
|
dict['Encoding'] = value[0];
|
|
break;
|
|
case 17:
|
|
dict['CharStrings'] = value[0];
|
|
break;
|
|
case 18:
|
|
dict['Private'] = value;
|
|
break;
|
|
default:
|
|
TODO('interpret top dict key');
|
|
}
|
|
}
|
|
return dict;
|
|
},
|
|
getStrings: function cff_getstrings(stringIndex) {
|
|
function bytesToString(bytesArr) {
|
|
var s = "";
|
|
for (var i = 0, ii = bytesArr.length; i < ii; ++i)
|
|
s += String.fromCharCode(bytesArr[i]);
|
|
return s;
|
|
}
|
|
|
|
var stringArray = [];
|
|
for (var i = 0, ii = CFFStrings.length; i < ii; ++i)
|
|
stringArray.push(CFFStrings[i]);
|
|
|
|
for (var i = 0, ii = stringIndex.length; i < ii; ++i)
|
|
stringArray.push(bytesToString(stringIndex.get(i)));
|
|
|
|
return stringArray;
|
|
},
|
|
parseHeader: function cff_parseHeader() {
|
|
var bytes = this.bytes;
|
|
var offset = 0;
|
|
|
|
while(bytes[offset] != 1)
|
|
++offset;
|
|
|
|
if (offset != 0) {
|
|
warning("cff data is shifted");
|
|
bytes = bytes.subarray(offset);
|
|
this.bytes = bytes;
|
|
}
|
|
|
|
return {
|
|
endPos: bytes[2],
|
|
offsetSize: bytes[3]
|
|
}
|
|
},
|
|
parseDict: function cff_parseDict(dict) {
|
|
var pos = 0;
|
|
|
|
function parseOperand() {
|
|
var value = dict[pos++];
|
|
if (value === 30) {
|
|
return parseFloatOperand(pos);
|
|
} else if (value === 28) {
|
|
value = dict[pos++];
|
|
value = (value << 8) | dict[pos++];
|
|
return value;
|
|
} else if (value === 29) {
|
|
value = dict[pos++];
|
|
value = (value << 8) | dict[pos++];
|
|
value = (value << 8) | dict[pos++];
|
|
value = (value << 8) | dict[pos++];
|
|
return value;
|
|
} else if (value <= 246) {
|
|
return value - 139;
|
|
} else if (value <= 250) {
|
|
return ((value - 247) * 256) + dict[pos++] + 108;
|
|
} else if (value <= 254) {
|
|
return -((value - 251) * 256) - dict[pos++] - 108;
|
|
} else {
|
|
error('Incorrect byte');
|
|
}
|
|
};
|
|
|
|
function parseFloatOperand() {
|
|
var str = "";
|
|
var eof = 15;
|
|
var lookup = ['0', '1', '2', '3', '4', '5', '6', '7', '8',
|
|
'9', '.', 'E', 'E-', null, '-'];
|
|
var length = dict.length;
|
|
while (pos < length) {
|
|
var b = dict[pos++];
|
|
var b1 = b >> 4;
|
|
var b2 = b & 15;
|
|
|
|
if (b1 == eof)
|
|
break;
|
|
str += lookup[b1];
|
|
|
|
if (b2 == eof)
|
|
break;
|
|
str += lookup[b2];
|
|
}
|
|
return parseFloat(str);
|
|
};
|
|
|
|
var operands = [];
|
|
var entries = [];
|
|
|
|
var pos = 0;
|
|
var end = dict.length;
|
|
while (pos < end) {
|
|
var b = dict[pos];
|
|
if (b <= 21) {
|
|
if (b === 12) {
|
|
++pos;
|
|
var b = (b << 8) | dict[pos];
|
|
}
|
|
entries.push([b, operands]);
|
|
operands = [];
|
|
++pos;
|
|
} else {
|
|
operands.push(parseOperand());
|
|
}
|
|
}
|
|
return entries;
|
|
},
|
|
parseIndex: function cff_parseIndex(pos) {
|
|
var bytes = this.bytes;
|
|
var count = bytes[pos++] << 8 | bytes[pos++];
|
|
if (count == 0) {
|
|
var offsets = [];
|
|
var end = pos;
|
|
} else {
|
|
var offsetSize = bytes[pos++];
|
|
// add 1 for offset to determine size of last object
|
|
var startPos = pos + ((count + 1) * offsetSize) - 1;
|
|
|
|
var offsets = [];
|
|
for (var i = 0, ii = count + 1; i < ii; ++i) {
|
|
var offset = 0;
|
|
for (var j = 0; j < offsetSize; ++j) {
|
|
offset <<= 8;
|
|
offset += bytes[pos++];
|
|
}
|
|
offsets.push(startPos + offset);
|
|
}
|
|
var end = offsets[count];
|
|
}
|
|
|
|
return {
|
|
get: function index_get(index) {
|
|
if (index >= count)
|
|
return null;
|
|
|
|
var start = offsets[index];
|
|
var end = offsets[index + 1];
|
|
return bytes.subarray(start, end);
|
|
},
|
|
length: count,
|
|
endPos: end
|
|
}
|
|
},
|
|
};
|
|
|
|
return constructor;
|
|
})();
|