Sakurai/pdf.js
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Merge pull request #3764 from saebekassebil/fingerprint

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Simplify get fingerprint() method
This commit is contained in:
Tim van der Meij 2013-10-11 11:55:37 -07:00
commit b9bceb4c4b
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);