From 1d9ac51db01b654f2c97d9fd3057b7b0ed716b91 Mon Sep 17 00:00:00 2001
From: James Moger <james.moger@gitblit.com>
Date: Mon, 3 Dec 2012 17:06:28 -0500
Subject: [PATCH] Simplified archive generation (issue-174)

---
 src/com/gitblit/utils/CompressionUtils.java | 88 ++++++++-------------
 1 file changed, 32 insertions(+), 56 deletions(-)

diff --git a/src/com/gitblit/utils/CompressionUtils.java b/src/com/gitblit/utils/CompressionUtils.java
index 7b0d0471..41451906 100644
--- a/src/com/gitblit/utils/CompressionUtils.java
+++ b/src/com/gitblit/utils/CompressionUtils.java
@@ -15,27 +15,24 @@
  */
 package com.gitblit.utils;
 
-import java.io.ByteArrayOutputStream;
 import java.io.IOException;
-import java.io.InputStream;
 import java.io.OutputStream;
 import java.text.MessageFormat;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.zip.ZipEntry;
-import java.util.zip.ZipOutputStream;
 
 import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
 import org.apache.commons.compress.archivers.tar.TarArchiveOutputStream;
+import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
+import org.apache.commons.compress.archivers.zip.ZipArchiveOutputStream;
 import org.apache.commons.compress.compressors.CompressorException;
 import org.apache.commons.compress.compressors.CompressorStreamFactory;
-import org.apache.commons.compress.utils.IOUtils;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.FileMode;
-import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.lib.MutableObjectId;
 import org.eclipse.jgit.lib.ObjectLoader;
+import org.eclipse.jgit.lib.ObjectReader;
 import org.eclipse.jgit.lib.Repository;
-import org.eclipse.jgit.revwalk.RevBlob;
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevWalk;
 import org.eclipse.jgit.treewalk.TreeWalk;
@@ -99,37 +96,35 @@ public class CompressionUtils {
 		RevWalk rw = new RevWalk(repository);
 		TreeWalk tw = new TreeWalk(repository);
 		try {
+			tw.reset();
 			tw.addTree(commit.getTree());
-			ZipOutputStream zos = new ZipOutputStream(os);
+			ZipArchiveOutputStream zos = new ZipArchiveOutputStream(os);
 			zos.setComment("Generated by Gitblit");
 			if (!StringUtils.isEmpty(basePath)) {
 				PathFilter f = PathFilter.create(basePath);
 				tw.setFilter(f);
 			}
 			tw.setRecursive(true);
+			MutableObjectId id = new MutableObjectId();
+			ObjectReader reader = tw.getObjectReader();
+			long modified = commit.getAuthorIdent().getWhen().getTime();
 			while (tw.next()) {
-				if (tw.getFileMode(0) == FileMode.GITLINK) {
+				FileMode mode = tw.getFileMode(0);
+				if (mode == FileMode.GITLINK || mode == FileMode.TREE) {
 					continue;
 				}
-				ZipEntry entry = new ZipEntry(tw.getPathString());
-				entry.setSize(tw.getObjectReader().getObjectSize(tw.getObjectId(0),
-						Constants.OBJ_BLOB));
-				entry.setComment(commit.getName());
-				zos.putNextEntry(entry);
+				tw.getObjectId(id, 0);
 
-				ObjectId entid = tw.getObjectId(0);
-				FileMode entmode = tw.getFileMode(0);
-				RevBlob blob = (RevBlob) rw.lookupAny(entid, entmode.getObjectType());
-				rw.parseBody(blob);
+				ZipArchiveEntry entry = new ZipArchiveEntry(tw.getPathString());
+				entry.setSize(reader.getObjectSize(id, Constants.OBJ_BLOB));
+				entry.setComment(commit.getName());
+				entry.setUnixMode(mode.getBits());
+				entry.setTime(modified);
+				zos.putArchiveEntry(entry);
 
-				ObjectLoader ldr = repository.open(blob.getId(), Constants.OBJ_BLOB);
-				byte[] tmp = new byte[4096];
-				InputStream in = ldr.openStream();
-				int n;
-				while ((n = in.read(tmp)) > 0) {
-					zos.write(tmp, 0, n);
-				}
-				in.close();
+				ObjectLoader ldr = repository.open(id);
+				ldr.copyTo(zos);
+				zos.closeArchiveEntry();
 			}
 			zos.finish();
 			success = true;
@@ -250,6 +245,7 @@ public class CompressionUtils {
 		RevWalk rw = new RevWalk(repository);
 		TreeWalk tw = new TreeWalk(repository);
 		try {
+			tw.reset();
 			tw.addTree(commit.getTree());
 			TarArchiveOutputStream tos = new TarArchiveOutputStream(cos);
 			tos.setAddPaxHeadersForNonAsciiNames(true);
@@ -259,45 +255,25 @@ public class CompressionUtils {
 				tw.setFilter(f);
 			}
 			tw.setRecursive(true);
+			MutableObjectId id = new MutableObjectId();
+			ObjectReader reader = tw.getObjectReader();
+			long modified = commit.getAuthorIdent().getWhen().getTime();
 			while (tw.next()) {
 				FileMode mode = tw.getFileMode(0);
-				if (mode == FileMode.GITLINK) {
+				if (mode == FileMode.GITLINK || mode == FileMode.TREE) {
 					continue;
 				}
-				ObjectId id = tw.getObjectId(0);
+				tw.getObjectId(id, 0);
 				
-				// new entry
 				TarArchiveEntry entry = new TarArchiveEntry(tw.getPathString());
-				entry.setSize(tw.getObjectReader().getObjectSize(id, Constants.OBJ_BLOB));
+				entry.setSize(reader.getObjectSize(id, Constants.OBJ_BLOB));
 				
-				if (FileMode.SYMLINK.equals(mode)) {
-					// symlink
-					entry.setMode(mode.getBits());
-					
-					// read the symlink target
-					ByteArrayOutputStream bs = new ByteArrayOutputStream();
-					RevBlob blob = (RevBlob) rw.lookupAny(id, mode.getObjectType());
-					rw.parseBody(blob);				
-					ObjectLoader ldr = repository.open(blob.getId(), Constants.OBJ_BLOB);
-					IOUtils.copy(ldr.openStream(), bs);
-					entry.setLinkName(bs.toString("UTF-8"));
-				} else {
-					// regular file or executable file
-					entry.setMode(mode.getBits());
-				}				
-				entry.setModTime(commit.getAuthorIdent().getWhen());
-
+				entry.setMode(mode.getBits());
+				entry.setModTime(modified);
 				tos.putArchiveEntry(entry);
 				
-				if (!FileMode.SYMLINK.equals(mode)) {
-					// write the blob
-					RevBlob blob = (RevBlob) rw.lookupAny(id, mode.getObjectType());
-					rw.parseBody(blob);				
-					ObjectLoader ldr = repository.open(blob.getId(), Constants.OBJ_BLOB);
-					IOUtils.copy(ldr.openStream(), tos);
-				}
-				
-				// close entry
+				ObjectLoader ldr = repository.open(id);
+				ldr.copyTo(tos);					
 				tos.closeArchiveEntry();
 			}
 			tos.finish();
-- 
2.39.5