1 files changed, 131 insertions, 0 deletions
diff --git a/src/main/com/tonicsystems/jarjar/util/IoUtil.java b/src/main/com/tonicsystems/jarjar/util/IoUtil.java
new file mode 100644
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+++ b/src/main/com/tonicsystems/jarjar/util/IoUtil.java
@@ -0,0 +1,131 @@
+/**
+ * Copyright 2008 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.tonicsystems.jarjar.util;
+
+import java.io.*;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.Enumeration;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
+import java.util.zip.ZipOutputStream;
+
+class IoUtil {
+    private IoUtil() {}
+
+    public static void pipe(InputStream is, OutputStream out, byte[] buf) throws IOException {
+        for (;;) {
+            int amt = is.read(buf);
+            if (amt < 0)
+                break;
+            out.write(buf, 0, amt);
+        }
+    }
+
+    public static void copy(File from, File to, byte[] buf) throws IOException {
+        InputStream in = new FileInputStream(from);
+        try {
+            OutputStream out = new FileOutputStream(to);
+            try {
+                pipe(in, out, buf);
+            } finally {
+                out.close();
+            }
+        } finally {
+            in.close();
+        }
+    }
+
+    /**
+     * Create a copy of an zip file without its empty directories.
+     * @param inputFile
+     * @param outputFile
+     * @throws IOException
+     */
+    public static void copyZipWithoutEmptyDirectories(final File inputFile, final File outputFile) throws IOException
+    {
+        final byte[] buf = new byte[0x2000];
+
+        final ZipFile inputZip = new ZipFile(inputFile);
+        final ZipOutputStream outputStream = new ZipOutputStream(new FileOutputStream(outputFile));
+        try
+        {
+            // read a the entries of the input zip file and sort them
+            final Enumeration<? extends ZipEntry> e = inputZip.entries();
+            final ArrayList<ZipEntry> sortedList = new ArrayList<ZipEntry>();
+            while (e.hasMoreElements()) {
+                final ZipEntry entry = e.nextElement();
+                sortedList.add(entry);
+            }
+
+            Collections.sort(sortedList, new Comparator<ZipEntry>()
+            {
+                public int compare(ZipEntry o1, ZipEntry o2)
+                {
+                    return o1.getName().compareTo(o2.getName());
+                }
+            });
+
+            // treat them again and write them in output, wenn they not are empty directories
+            for (int i = sortedList.size()-1; i>=0; i--)
+            {
+                final ZipEntry inputEntry = sortedList.get(i);
+                final String name = inputEntry.getName();
+                final boolean isEmptyDirectory;
+                if (inputEntry.isDirectory())
+                {
+                    if (i == sortedList.size()-1)
+                    {
+                        // no item afterwards; it was an empty directory
+                        isEmptyDirectory = true;
+                    }
+                    else
+                    {
+                        final String nextName = sortedList.get(i+1).getName();
+                        isEmptyDirectory  = !nextName.startsWith(name);
+                    }
+                }
+                else
+                {
+                    isEmptyDirectory = false;
+                }
+
+
+                // write the entry
+                if (isEmptyDirectory)
+                {
+                    sortedList.remove(inputEntry);
+                }
+                else
+                {
+                    final ZipEntry outputEntry = new ZipEntry(inputEntry);
+                    outputStream.putNextEntry(outputEntry);
+                    ByteArrayOutputStream baos = new ByteArrayOutputStream();
+                    final InputStream is = inputZip.getInputStream(inputEntry);
+                    IoUtil.pipe(is, baos, buf);
+                    is.close();
+                    outputStream.write(baos.toByteArray());
+                }
+            }
+        } finally {
+            outputStream.close();
+        }
+
+    }
+
+}