1 files changed, 119 insertions, 0 deletions
diff --git a/third_party/jarjar/java/com/tonicsystems/jarjar/util/IoUtil.java b/third_party/jarjar/java/com/tonicsystems/jarjar/util/IoUtil.java
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+++ b/third_party/jarjar/java/com/tonicsystems/jarjar/util/IoUtil.java
@@ -0,0 +1,119 @@
+/*
+ * 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();
+    }
+  }
+}