PDFBOX-5972: avoid infinite loop, as suggested by Michael Flester

THausherr · THausherr · commit b9241afd3646 · 2025-03-10T13:08:51.000Z
git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1924271 13f79535-47bb-0310-9956-ffa450edef68
diff --git 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 @@ private Number readNumber(RandomAccessRead randomAcccessRead, int firstByte) thr
             buffer.append((char) nextByte);
             nextByte = randomAcccessRead.read();
         }
-        randomAcccessRead.rewind(1);
+        if (nextByte != -1)
+        {
+            randomAcccessRead.rewind(1);
+        }
         String value = buffer.toString();
         try
         {

Original file line number	Diff line number	Diff line change
`@@ -652,7 +652,10 @@ private Number readNumber(RandomAccessRead randomAcccessRead, int firstByte) thr`
`652`	`652`	`buffer.append((char) nextByte);`
`653`	`653`	`nextByte = randomAcccessRead.read();`
`654`	`654`	`}`
`655`		`- randomAcccessRead.rewind(1);`
	`655`	`+ if (nextByte != -1)`
	`656`	`+ {`
	`657`	`+ randomAcccessRead.rewind(1);`
	`658`	`+ }`
`656`	`659`	`String value = buffer.toString();`
`657`	`660`	`try`
`658`	`661`	`{`