[JGIT PATCH 5/5] Use Deflater directly in PackWriter

["Shawn O. Pearce" <spearce@spearce.org>]

Rather than going through all of the indirection that makes up the
DeflaterOutputStream, including the new object construction for it
and the temporary buffer it allocates internally, we can pump data
directly through our Deflater instance and use our existing 16 KB
temporary "buf" for the transient storage as we compress data to
the pack output stream.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
---
 .../src/org/spearce/jgit/lib/PackWriter.java       |   12 +++++++-----
 1 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/org.spearce.jgit/src/org/spearce/jgit/lib/PackWriter.java b/org.spearce.jgit/src/org/spearce/jgit/lib/PackWriter.java
index 2f34255..2d05c4e 100644
--- a/org.spearce.jgit/src/org/spearce/jgit/lib/PackWriter.java
+++ b/org.spearce.jgit/src/org/spearce/jgit/lib/PackWriter.java
@@ -47,7 +47,6 @@
 import java.util.Iterator;
 import java.util.List;
 import java.util.zip.Deflater;
-import java.util.zip.DeflaterOutputStream;
 
 import org.spearce.jgit.errors.IncorrectObjectTypeException;
 import org.spearce.jgit.errors.MissingObjectException;
@@ -699,12 +698,15 @@ private void writeWholeObject(final ObjectToPack otp) throws IOException {
 		} else {
 			final ObjectLoader loader = db.openObject(windowCursor, otp);
 			final byte[] data = loader.getCachedBytes();
-			final DeflaterOutputStream deflaterOut = new DeflaterOutputStream(
-					out, deflater);
 			writeObjectHeader(otp.getType(), data.length);
-			deflaterOut.write(data);
-			deflaterOut.finish();
 			deflater.reset();
+			deflater.setInput(data, 0, data.length);
+			deflater.finish();
+			do {
+				final int n = deflater.deflate(buf, 0, buf.length);
+				if (n > 0)
+					out.write(buf, 0, n);
+			} while (!deflater.finished());
 		}
 	}
 
-- 
1.6.2.1.471.g682837