@Test
public void shouldChangeMethodWhenCompressionLevelIsChanged() {
CustomZipEntry entry = new CustomZipEntry("cake");
assertEquals(ZipEntry.DEFLATED, entry.getMethod());
assertEquals(Deflater.DEFAULT_COMPRESSION, entry.getCompressionLevel());
entry.setCompressionLevel(NO_COMPRESSION);
assertEquals(ZipEntry.STORED, entry.getMethod());
entry.setCompressionLevel(BEST_COMPRESSION);
assertEquals(ZipEntry.DEFLATED, entry.getMethod());
}
@Test
public void compressionCanBeSetOnAPerFileBasisAndIsHonoured() throws IOException {
// Create some input that can be compressed.
String packageName = getClass().getPackage().getName().replace(".", "/");
URL sample = Resources.getResource(packageName + "/sample-bytes.properties");
byte[] input = Resources.toByteArray(sample);
try (CustomZipOutputStream out = ZipOutputStreams.newOutputStream(output)) {
CustomZipEntry entry = new CustomZipEntry("default");
// Don't set the compression level. Should be the default.
out.putNextEntry(entry);
out.write(input);
entry = new CustomZipEntry("stored");
entry.setCompressionLevel(NO_COMPRESSION);
byte[] bytes = "stored".getBytes();
entry.setSize(bytes.length);
entry.setCrc(Hashing.crc32().hashBytes(bytes).padToLong());
out.putNextEntry(entry);
out.write(bytes);
entry = new CustomZipEntry("best");
entry.setCompressionLevel(BEST_COMPRESSION);
out.putNextEntry(entry);
out.write(input);
}
try (ZipInputStream in = new ZipInputStream(Files.newInputStream(output))) {
ZipEntry entry = in.getNextEntry();
assertEquals("default", entry.getName());
ByteStreams.copy(in, ByteStreams.nullOutputStream());
long defaultCompressedSize = entry.getCompressedSize();
assertNotEquals(entry.getCompressedSize(), entry.getSize());
entry = in.getNextEntry();
ByteStreams.copy(in, ByteStreams.nullOutputStream());
assertEquals("stored", entry.getName());
assertEquals(entry.getCompressedSize(), entry.getSize());
entry = in.getNextEntry();
ByteStreams.copy(in, ByteStreams.nullOutputStream());
assertEquals("best", entry.getName());
ByteStreams.copy(in, ByteStreams.nullOutputStream());
assertThat(entry.getCompressedSize(), lessThan(defaultCompressedSize));
}
}
@Test
public void canWriteContentToStoredZips() throws IOException {
Path overwriteZip = Files.createTempFile("overwrite", ".zip");
byte[] input = "I like cheese".getBytes(UTF_8);
try (CustomZipOutputStream overwrite =
ZipOutputStreams.newOutputStream(overwriteZip, OVERWRITE_EXISTING);
CustomZipOutputStream appending = ZipOutputStreams.newOutputStream(output, APPEND_TO_ZIP)) {
CustomZipEntry entry = new CustomZipEntry("cheese.txt");
entry.setCompressionLevel(NO_COMPRESSION);
entry.setTime(0);
overwrite.putNextEntry(entry);
appending.putNextEntry(entry);
overwrite.write(input);
appending.write(input);
}
}