Sakurai/pdf.js
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refactor getFingerprint

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Saebekassebil 2012-03-27 00:14:59 +02:00
parent 94a1558843
commit 4703a6cfcd
1 changed files with 11 additions and 16 deletions
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27
src/core.js
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@ -587,16 +587,6 @@ var PDFDocModel = (function PDFDocModelClosure() {
this.mainXRefEntriesOffset);
this.xref = xref;
this.catalog = new Catalog(xref);
if (xref.trailer) {
if (xref.trailer.has('ID')) {
var fileID = '';
var id = xref.fetchIfRef(xref.trailer.get('ID'))[0];
id.split('').forEach(function(el) {
fileID += Number(el.charCodeAt(0)).toString(16);
});
this.fileID = fileID;
}
}
},
get numPages() {
var linearization = this.linearization;
@ -610,20 +600,25 @@ var PDFDocModel = (function PDFDocModelClosure() {
}
},
getFingerprint: function pdfDocGetFingerprint() {
if (this.fileID) {
return this.fileID;
var xref = this.xref, fileID;
if (xref.trailer.has('ID')) {
fileID = '';
var id = xref.fetchIfRef(xref.trailer.get('ID'))[0];
id.split('').forEach(function(el) {
fileID += Number(el.charCodeAt(0)).toString(16);
});
} else {
// If we got no fileID, then we generate one,
// from the first 100 bytes of PDF
var data = this.stream.bytes.subarray(0, 100);
var hash = calculateMD5(data, 0, data.length);
var strHash = '';
fileID = '';
for (var i = 0, length = hash.length; i < length; i++) {
strHash += Number(hash[i]).toString(16);
fileID += Number(hash[i]).toString(16);
}
return strHash;
}
return shadow(this, 'getFingerprint', fileID);
},
getPage: function pdfDocGetPage(n) {
return this.catalog.getPage(n);