1 files changed, 106 insertions, 0 deletions
diff --git a/src/java_tools/singlejar/javatests/com/google/devtools/build/singlejar/ZipFactory.java b/src/java_tools/singlejar/javatests/com/google/devtools/build/singlejar/ZipFactory.java
new file mode 100644
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--- /dev/null
+++ b/src/java_tools/singlejar/javatests/com/google/devtools/build/singlejar/ZipFactory.java
@@ -0,0 +1,106 @@
+// Copyright 2015 Google Inc. All rights reserved.
+//
+// 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.google.devtools.build.singlejar;
+
+import static java.nio.charset.StandardCharsets.ISO_8859_1;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.zip.CRC32;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipOutputStream;
+
+/**
+ * A helper class to create zip files for testing.
+ */
+public class ZipFactory {
+
+  static class Entry {
+    private final String name;
+    private final byte[] content;
+    private final boolean compressed;
+    private Entry(String name, byte[] content, boolean compressed) {
+      this.name = name;
+      this.content = content;
+      this.compressed = compressed;
+    }
+  }
+
+  private final List<Entry> entries = new ArrayList<>();
+
+  // Assumes that content was created locally. Does not perform a defensive copy!
+  private void addEntry(String name, byte[] content, boolean compressed) {
+    entries.add(new Entry(name, content, compressed));
+  }
+
+  public ZipFactory addFile(String name, String content) {
+    addEntry(name, content.getBytes(ISO_8859_1), true);
+    return this;
+  }
+
+  public ZipFactory addFile(String name, byte[] content) {
+    addEntry(name, content.clone(), true);
+    return this;
+  }
+
+  public ZipFactory addFile(String name, String content, boolean compressed) {
+    addEntry(name, content.getBytes(ISO_8859_1), compressed);
+    return this;
+  }
+
+  public ZipFactory addFile(String name, byte[] content, boolean compressed) {
+    addEntry(name, content.clone(), compressed);
+    return this;
+  }
+
+  public byte[] toByteArray() {
+    try {
+      ByteArrayOutputStream out = new ByteArrayOutputStream();
+      ZipOutputStream zipper = new ZipOutputStream(out);
+      for (Entry entry : entries) {
+        ZipEntry zipEntry = new ZipEntry(entry.name);
+        if (entry.compressed) {
+          zipEntry.setMethod(ZipEntry.DEFLATED);
+        } else {
+          zipEntry.setMethod(ZipEntry.STORED);
+          zipEntry.setSize(entry.content.length);
+          zipEntry.setCrc(calculateCrc32(entry.content));
+        }
+        zipEntry.setTime(ZipCombiner.DOS_EPOCH.getTime());
+        zipper.putNextEntry(zipEntry);
+        zipper.write(entry.content);
+        zipper.closeEntry();
+      }
+      zipper.close();
+      return out.toByteArray();
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  public InputStream toInputStream() {
+    return new ByteArrayInputStream(toByteArray());
+  }
+
+  public static long calculateCrc32(byte[] content) {
+    CRC32 crc = new CRC32();
+    crc.update(content);
+    return crc.getValue();
+  }
+}