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/*
* Copyright (C) 2014 Square, 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 okio;
import java.io.EOFException;
import java.io.IOException;
import java.util.List;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.Inflater;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;
import static kotlin.text.StringsKt.repeat;
import static okio.TestUtil.SEGMENT_SIZE;
import static okio.TestUtil.randomBytes;
import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
import static org.junit.Assume.assumeFalse;
@RunWith(Parameterized.class)
public final class InflaterSourceTest {
/**
* Use a parameterized test to control how many bytes the InflaterSource gets with each request
* for more bytes.
*/
@Parameters(name = "{0}")
public static List parameters() {
return BufferedSourceFactory.Companion.getPARAMETERIZED_TEST_VALUES();
}
public final BufferedSourceFactory bufferFactory;
public BufferedSink deflatedSink;
public BufferedSource deflatedSource;
public InflaterSourceTest(BufferedSourceFactory bufferFactory) {
this.bufferFactory = bufferFactory;
resetDeflatedSourceAndSink();
}
private void resetDeflatedSourceAndSink() {
BufferedSourceFactory.Pipe pipe = bufferFactory.pipe();
this.deflatedSink = pipe.getSink();
this.deflatedSource = pipe.getSource();
}
@Test public void inflate() throws Exception {
decodeBase64("eJxzz09RyEjNKVAoLdZRKE9VL0pVyMxTKMlIVchIzEspVshPU0jNS8/MS00tKtYDAF6CD5s=");
Buffer inflated = inflate(deflatedSource);
assertEquals("God help us, we're in the hands of engineers.", inflated.readUtf8());
}
@Test public void inflateTruncated() throws Exception {
decodeBase64("eJxzz09RyEjNKVAoLdZRKE9VL0pVyMxTKMlIVchIzEspVshPU0jNS8/MS00tKtYDAF6CDw==");
try {
inflate(deflatedSource);
fail();
} catch (EOFException expected) {
}
}
@Test public void inflateWellCompressed() throws Exception {
decodeBase64("eJztwTEBAAAAwqCs61/CEL5AAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAB8BtFeWvE=");
String original = repeat("a", 1024 * 1024);
deflate(ByteString.encodeUtf8(original));
Buffer inflated = inflate(deflatedSource);
assertEquals(original, inflated.readUtf8());
}
@Test public void inflatePoorlyCompressed() throws Exception {
assumeFalse(bufferFactory.isOneByteAtATime()); // 8 GiB for 1 byte per segment!
ByteString original = randomBytes(1024 * 1024);
deflate(original);
Buffer inflated = inflate(deflatedSource);
assertEquals(original, inflated.readByteString());
}
@Test public void inflateIntoNonemptySink() throws Exception {
for (int i = 0; i < SEGMENT_SIZE; i++) {
resetDeflatedSourceAndSink();
Buffer inflated = new Buffer().writeUtf8(repeat("a", i));
deflate(ByteString.encodeUtf8("God help us, we're in the hands of engineers."));
InflaterSource source = new InflaterSource(deflatedSource, new Inflater());
while (source.read(inflated, Integer.MAX_VALUE) != -1) {
}
inflated.skip(i);
assertEquals("God help us, we're in the hands of engineers.", inflated.readUtf8());
}
}
@Test public void inflateSingleByte() throws Exception {
Buffer inflated = new Buffer();
decodeBase64("eJxzz09RyEjNKVAoLdZRKE9VL0pVyMxTKMlIVchIzEspVshPU0jNS8/MS00tKtYDAF6CD5s=");
InflaterSource source = new InflaterSource(deflatedSource, new Inflater());
source.read(inflated, 1);
source.close();
assertEquals("G", inflated.readUtf8());
assertEquals(0, inflated.size());
}
@Test public void inflateByteCount() throws Exception {
assumeFalse(bufferFactory.isOneByteAtATime()); // This test assumes one step.
Buffer inflated = new Buffer();
decodeBase64("eJxzz09RyEjNKVAoLdZRKE9VL0pVyMxTKMlIVchIzEspVshPU0jNS8/MS00tKtYDAF6CD5s=");
InflaterSource source = new InflaterSource(deflatedSource, new Inflater());
source.read(inflated, 11);
source.close();
assertEquals("God help us", inflated.readUtf8());
assertEquals(0, inflated.size());
}
@Test public void sourceExhaustedPrematurelyOnRead() throws Exception {
// Deflate 0 bytes of data that lacks the in-stream terminator.
decodeBase64("eJwAAAD//w==");
Buffer inflated = new Buffer();
Inflater inflater = new Inflater();
InflaterSource source = new InflaterSource(deflatedSource, inflater);
assertThat(deflatedSource.exhausted()).isFalse();
try {
source.read(inflated, Long.MAX_VALUE);
fail();
} catch (EOFException expected) {
assertThat(expected).hasMessage("source exhausted prematurely");
}
// Despite the exception, the read() call made forward progress on the underlying stream!
assertThat(deflatedSource.exhausted()).isTrue();
}
/**
* Confirm that {@link InflaterSource#readOrInflate} consumes a byte on each call even if it
* doesn't produce a byte on every call.
*/
@Test public void readOrInflateMakesByteByByteProgress() throws Exception {
// Deflate 0 bytes of data that lacks the in-stream terminator.
decodeBase64("eJwAAAD//w==");
int deflatedByteCount = 7;
Buffer inflated = new Buffer();
Inflater inflater = new Inflater();
InflaterSource source = new InflaterSource(deflatedSource, inflater);
assertThat(deflatedSource.exhausted()).isFalse();
if (bufferFactory.isOneByteAtATime()) {
for (int i = 0; i < deflatedByteCount; i++) {
assertThat(inflater.getBytesRead()).isEqualTo(i);
assertThat(source.readOrInflate(inflated, Long.MAX_VALUE)).isEqualTo(0L);
}
} else {
assertThat(source.readOrInflate(inflated, Long.MAX_VALUE)).isEqualTo(0L);
}
assertThat(inflater.getBytesRead()).isEqualTo(deflatedByteCount);
assertThat(deflatedSource.exhausted());
}
private void decodeBase64(String s) throws IOException {
deflatedSink.write(ByteString.decodeBase64(s));
deflatedSink.flush();
}
/** Use DeflaterOutputStream to deflate source. */
private void deflate(ByteString source) throws IOException {
Sink sink = Okio.sink(new DeflaterOutputStream(deflatedSink.outputStream()));
sink.write(new Buffer().write(source), source.size());
sink.close();
}
/** Returns a new buffer containing the inflated contents of {@code deflated}. */
private Buffer inflate(BufferedSource deflated) throws IOException {
Buffer result = new Buffer();
InflaterSource source = new InflaterSource(deflated, new Inflater());
while (source.read(result, Integer.MAX_VALUE) != -1) {
}
return result;
}
}