Fix Implicit narrowing conversion in compound assignment

Currently we add a long to an int this can result in information loss
and numeric errors such as overflows.

As we only skip an integer amount of bytes the result can also only be
an int of bytes skipped, adding an explicit cast makes the security
scanner happy here.

Author: laeubi

apitools/org.eclipse.pde.api.tools/src/org/eclipse/pde/api/tools/internal/util/TarFile.java

@@ -30,12 +30,12 @@
  */
 public class TarFile implements Closeable {
 	private static class TarInputStream extends FilterInputStream {
-		private int nextEntry = 0;
-		private int nextEOF = 0;
-		private int filepos = 0;
-		private int bytesread = 0;
-		private TarEntry firstEntry = null;
-		private String longLinkName = null;
+		private int nextEntry;
+		private int nextEOF;
+		private int filepos;
+		private int bytesread;
+		private TarEntry firstEntry;
+		private String longLinkName;
 
 		/**
 		 * Creates a new tar input stream on the given input stream.
@@ -87,7 +87,7 @@ boolean skipToEntry(TarEntry entry) throws TarException, IOException {
 				return false;
 			}
 			while (bytestoskip > 0) {
-				long ret = in.skip(bytestoskip);
+				int ret = (int) in.skip(bytestoskip);
 				if (ret < 0) {
 					throw new IOException("early end of stream"); //$NON-NLS-1$
 				}
@@ -162,7 +162,7 @@ TarEntry getNextEntryInternal() throws TarException, IOException {
 			}
 
 			while (nextEntry > 0) {
-				long ret = in.skip(nextEntry);
+				int ret = (int) in.skip(nextEntry);
 				if (ret < 0) {
 					throw new IOException("early end of stream"); //$NON-NLS-1$
 				}