Sakurai/pdf.js
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Simplify get fingerprint() method

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This commit is contained in:
Jakob Miland 2013-10-03 10:09:06 +02:00
parent e97e0032df
commit c341dd57e5
1 changed files with 9 additions and 15 deletions
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24
src/core/core.js
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@ -17,7 +17,7 @@
/* globals assertWellFormed, calculateMD5, Catalog, error, info, isArray,
isArrayBuffer, isName, isStream, isString, Lexer,
Linearization, NullStream, PartialEvaluator, shadow, Stream,
StreamsSequenceStream, stringToPDFString, Util, XRef,
StreamsSequenceStream, stringToPDFString, stringToBytes, Util, XRef,
MissingDataException, Promise, Annotation, ObjectLoader, OperatorList
*/
@ -481,22 +481,16 @@ var PDFDocument = (function PDFDocumentClosure() {
return shadow(this, 'documentInfo', docInfo);
},
get fingerprint() {
var xref = this.xref, fileID;
var xref = this.xref, hash, fileID = '';
if (xref.trailer.has('ID')) {
fileID = '';
var id = xref.trailer.get('ID')[0];
id.split('').forEach(function(el) {
fileID += Number(el.charCodeAt(0)).toString(16);
});
hash = stringToBytes(xref.trailer.get('ID')[0]);
} 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);
fileID = '';
for (var i = 0, length = hash.length; i < length; i++) {
fileID += Number(hash[i]).toString(16);
}
hash = calculateMD5(this.stream.bytes.subarray(0, 100), 0, 100);
}
for (var i = 0, n = hash.length; i < n; i++) {
fileID += hash[i].toString(16);
}
return shadow(this, 'fingerprint', fileID);