PDFBOX-6141: avoid NegativeArraySizeException

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1931150 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

pdfbox/src/main/java/org/apache/pdfbox/filter/Predictor.java

@@ -231,8 +231,9 @@ static int calcSetBitSeq(int by, int startBit, int bitSize, int val)
      * @param decodeParams Decode parameters for the stream
      * @return An <code>OutputStream</code> is returned, which will write decoded data
      * into the given stream. If no predictor is specified, the original stream is returned.
+     * @throws IOException
      */
-    static OutputStream wrapPredictor(OutputStream out, COSDictionary decodeParams)
+    static OutputStream wrapPredictor(OutputStream out, COSDictionary decodeParams) throws IOException
     {
         int predictor = decodeParams.getInt(COSName.PREDICTOR);
         if (predictor > 1)
@@ -276,13 +277,18 @@ private static final class PredictorOutputStream extends FilterOutputStream
         private boolean predictorRead = false;
 
         PredictorOutputStream(OutputStream out, int predictor, int colors, int bitsPerComponent, int columns)
+                throws IOException
         {
             super(out);
             this.predictor = predictor;
             this.colors = colors;
             this.bitsPerComponent = bitsPerComponent;
             this.columns = columns;
             this.rowLength = calculateRowLength(colors, bitsPerComponent, columns);
+            if (rowLength < 0)
+            {
+                throw new IOException("Calculated row length is negative: " + rowLength);
+            }
             this.predictorPerRow = predictor >= 10;
             currentRow = new byte[rowLength];
             lastRow = new byte[rowLength];