problem 48894

1) buffer size management is present in FileChannel, so we do not need to impose any limit.
2) bus error in gij when requested copy size > remaining file size (this is a bug in gij that will not be triggered anymore by ant from this line)

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@922179 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/util/ResourceUtils.java

@@ -466,7 +466,7 @@ public class ResourceUtils {
                 long count = srcChannel.size();
                 while (position < count) {
                     position +=
-                        srcChannel.transferTo(position, FileUtils.BUF_SIZE,
+                        srcChannel.transferTo(position, count - position,
                                               destChannel);
                 }
             } finally {