Throw CorruptObjectException when a bad object is found

This makes it easier to identify higher in the call stack.

Change-Id: I829431c38c71fa1899e33916252b75f09db8ecbd

org.eclipse.jgit/src/org/eclipse/jgit/errors/CorruptObjectException.java

@@ -90,4 +90,19 @@ public class CorruptObjectException extends IOException {
 	public CorruptObjectException(final String why) {
 		super(why);
 	}
+
+	/**
+	 * Construct a CorruptObjectException for reporting a problem not associated
+	 * with a specific object id.
+	 *
+	 * @param why
+	 *            message describing the corruption.
+	 * @param cause
+	 *            optional root cause exception
+	 * @since 3.4
+	 */
+	public CorruptObjectException(String why, Throwable cause) {
+		super(why);
+		initCause(cause);
+	}
 }

org.eclipse.jgit/src/org/eclipse/jgit/transport/PackParser.java

@@ -1014,9 +1014,10 @@ public abstract class PackParser {
 			try {
 				objCheck.check(type, data);
 			} catch (CorruptObjectException e) {
-				throw new IOException(MessageFormat.format(
+				throw new CorruptObjectException(MessageFormat.format(
-						JGitText.get().invalidObject, Constants
+						JGitText.get().invalidObject,
-								.typeString(type), id.name(), e.getMessage()));
+						Constants.typeString(type),
+						id.name(), e.getMessage()), e);
 			}
 		}