87 lines
2.7 KiB
JavaScript
87 lines
2.7 KiB
JavaScript
/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
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'use strict';
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var Metadata = PDFJS.Metadata = (function MetadataClosure() {
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function fixMetadata(meta) {
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return meta.replace(/>\\376\\377([^<]+)/g, function(all, codes) {
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var bytes = codes.replace(/\\([0-3])([0-7])([0-7])/g,
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function(code, d1, d2, d3) {
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return String.fromCharCode(d1 * 64 + d2 * 8 + d3 * 1);
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});
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var chars = '';
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for (var i = 0; i < bytes.length; i += 2) {
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var code = bytes.charCodeAt(i) * 256 + bytes.charCodeAt(i + 1);
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chars += code >= 32 && code < 127 && code != 60 && code != 62 &&
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code != 38 && false ? String.fromCharCode(code) :
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'&#x' + (0x10000 + code).toString(16).substring(1) + ';';
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}
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return '>' + chars;
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});
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}
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function Metadata(meta) {
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if (typeof meta === 'string') {
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// Ghostscript produces invalid metadata
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meta = fixMetadata(meta);
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var parser = new DOMParser();
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meta = parser.parseFromString(meta, 'application/xml');
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} else if (!(meta instanceof Document)) {
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error('Metadata: Invalid metadata object');
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}
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this.metaDocument = meta;
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this.metadata = {};
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this.parse();
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}
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Metadata.prototype = {
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parse: function Metadata_parse() {
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var doc = this.metaDocument;
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var rdf = doc.documentElement;
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if (rdf.nodeName.toLowerCase() !== 'rdf:rdf') { // Wrapped in <xmpmeta>
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rdf = rdf.firstChild;
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while (rdf && rdf.nodeName.toLowerCase() !== 'rdf:rdf')
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rdf = rdf.nextSibling;
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}
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var nodeName = (rdf) ? rdf.nodeName.toLowerCase() : null;
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if (!rdf || nodeName !== 'rdf:rdf' || !rdf.hasChildNodes())
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return;
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var childNodes = rdf.childNodes, desc, namespace, entries, entry;
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for (var i = 0, length = childNodes.length; i < length; i++) {
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desc = childNodes[i];
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if (desc.nodeName.toLowerCase() !== 'rdf:description')
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continue;
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entries = [];
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for (var ii = 0, iLength = desc.childNodes.length; ii < iLength; ii++) {
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if (desc.childNodes[ii].nodeName.toLowerCase() !== '#text')
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entries.push(desc.childNodes[ii]);
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}
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for (ii = 0, iLength = entries.length; ii < iLength; ii++) {
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var entry = entries[ii];
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var name = entry.nodeName.toLowerCase();
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this.metadata[name] = entry.textContent.trim();
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}
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}
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},
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get: function Metadata_get(name) {
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return this.metadata[name] || null;
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},
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has: function Metadata_has(name) {
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return typeof this.metadata[name] !== 'undefined';
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}
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};
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return Metadata;
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})();
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