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Merge pull request #6491 from Snuffleupagus/check-trailer-if-xref-missing

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Make `XRef_indexObjects` even more robust against bad PDF files, by checking for the existence of 'trailer' if 'xref' is not found
This commit is contained in:
Tim van der Meij 2015-10-04 16:00:00 +02:00
commit 5e4910f7b6
4 changed files with 80 additions and 1 deletions
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7
src/core/obj.js
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@ -1060,6 +1060,7 @@ var XRef = (function XRefClosure() {
}
return skipped;
}
var objRegExp = /^(\d+)\s+(\d+)\s+obj\b/;
var trailerBytes = new Uint8Array([116, 114, 97, 105, 108, 101, 114]);
var startxrefBytes = new Uint8Array([115, 116, 97, 114, 116, 120, 114,
101, 102]);
@ -1097,7 +1098,7 @@ var XRef = (function XRefClosure() {
position += skipUntil(buffer, position, trailerBytes);
trailers.push(position);
position += skipUntil(buffer, position, startxrefBytes);
} else if ((m = /^(\d+)\s+(\d+)\s+obj\b/.exec(token))) {
} else if ((m = objRegExp.exec(token))) {
if (typeof this.entries[m[1]] === 'undefined') {
this.entries[m[1]] = {
offset: position - stream.start,
@ -1118,6 +1119,10 @@ var XRef = (function XRefClosure() {
}
position += contentLength;
} else if (token.indexOf('trailer') === 0 &&
(token.length === 7 || /\s/.test(token[7]))) {
trailers.push(position);
position += skipUntil(buffer, position, startxrefBytes);
} else {
position += token.length + 1;
}