Michael Flester created PDFBOX-5972:
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Summary: Infinite loop in fontbox o.a.f.cmap.CMapParser#readNumber
Key: PDFBOX-5972
URL: https://issues.apache.org/jira/browse/PDFBOX-5972
Project: PDFBox
Issue Type: Bug
Components: FontBox
Affects Versions: 3.0.4 PDFBox, 3.0.3 PDFBox
Reporter: Michael Flester
Attachments: sample-decoded.pdf
The sample document attached goes into an infinite loop in
o.a.f.CMapParser.readNumber.
The attached document was created from proprietary content by using
o.a.p.tools.PDFSplit and o.a.p.tools.WriteDecodedDoc, so that we could remove
the proprietary content more easily.
The very short stream at line 225/226 happens to end with '6', and this makes
the current readNumber routine rewind the EOF, and leaves it unable to progress.
Here is a patch that seems to fix this issue by not rewinding EOF. All existing
unit tests still pass with this patch (diff -w), and the sample document
exhibits normal behavior.
{noformat}
--- a/fontbox/src/main/java/org/apache/fontbox/cmap/CMapParser.java
+++ b/fontbox/src/main/java/org/apache/fontbox/cmap/CMapParser.java
@@ -652,7 +652,10 @@ public class CMapParser
buffer.append((char) nextByte);
nextByte = randomAcccessRead.read();
}
+ if (nextByte != -1)
+ {
randomAcccessRead.rewind(1);
+ }
String value = buffer.toString();
try
{ {noformat}
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