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// 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();
}
}
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