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/* Copyright 2017 Google Inc. All Rights Reserved.
Distributed under MIT license.
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
*/
package org.brotli.wrapper.enc;
import org.brotli.enc.PreparedDictionary;
import java.io.IOException;
import java.nio.ByteBuffer;
/**
* JNI wrapper for brotli encoder.
*/
class EncoderJNI {
private static native ByteBuffer nativeCreate(long[] context);
private static native void nativePush(long[] context, int length);
private static native ByteBuffer nativePull(long[] context);
private static native void nativeDestroy(long[] context);
private static native boolean nativeAttachDictionary(long[] context, ByteBuffer dictionary);
private static native ByteBuffer nativePrepareDictionary(ByteBuffer dictionary, long type);
private static native void nativeDestroyDictionary(ByteBuffer dictionary);
enum Operation {
PROCESS,
FLUSH,
FINISH
}
private static class PreparedDictionaryImpl implements PreparedDictionary {
private ByteBuffer data;
private PreparedDictionaryImpl(ByteBuffer data) {
this.data = data;
}
@Override
public ByteBuffer getData() {
return data;
}
@Override
protected void finalize() throws Throwable {
try {
ByteBuffer data = this.data;
this.data = null;
nativeDestroyDictionary(data);
} finally {
super.finalize();
}
}
}
/**
* Prepares raw or serialized dictionary for being used by encoder.
*
* @param dictionary raw / serialized dictionary data; MUST be direct
* @param sharedDictionaryType dictionary data type
*/
static PreparedDictionary prepareDictionary(ByteBuffer dictionary, int sharedDictionaryType) {
if (!dictionary.isDirect()) {
throw new IllegalArgumentException("only direct buffers allowed");
}
ByteBuffer dictionaryData = nativePrepareDictionary(dictionary, sharedDictionaryType);
if (dictionaryData == null) {
throw new IllegalStateException("OOM");
}
return new PreparedDictionaryImpl(dictionaryData);
}
static class Wrapper {
protected final long[] context = new long[5];
private final ByteBuffer inputBuffer;
private boolean fresh = true;
Wrapper(int inputBufferSize, int quality, int lgwin, Encoder.Mode mode)
throws IOException {
if (inputBufferSize <= 0) {
throw new IOException("buffer size must be positive");
}
this.context[1] = inputBufferSize;
this.context[2] = quality;
this.context[3] = lgwin;
this.context[4] = mode != null ? mode.ordinal() : -1;
this.inputBuffer = nativeCreate(this.context);
if (this.context[0] == 0) {
throw new IOException("failed to initialize native brotli encoder");
}
this.context[1] = 1;
this.context[2] = 0;
this.context[3] = 0;
this.context[4] = 0;
}
boolean attachDictionary(ByteBuffer dictionary) {
if (!dictionary.isDirect()) {
throw new IllegalArgumentException("only direct buffers allowed");
}
if (context[0] == 0) {
throw new IllegalStateException("brotli decoder is already destroyed");
}
if (!fresh) {
throw new IllegalStateException("decoding is already started");
}
return nativeAttachDictionary(context, dictionary);
}
void push(Operation op, int length) {
if (length < 0) {
throw new IllegalArgumentException("negative block length");
}
if (context[0] == 0) {
throw new IllegalStateException("brotli encoder is already destroyed");
}
if (!isSuccess() || hasMoreOutput()) {
throw new IllegalStateException("pushing input to encoder in unexpected state");
}
if (hasRemainingInput() && length != 0) {
throw new IllegalStateException("pushing input to encoder over previous input");
}
context[1] = op.ordinal();
fresh = false;
nativePush(context, length);
}
boolean isSuccess() {
return context[1] != 0;
}
boolean hasMoreOutput() {
return context[2] != 0;
}
boolean hasRemainingInput() {
return context[3] != 0;
}
boolean isFinished() {
return context[4] != 0;
}
ByteBuffer getInputBuffer() {
return inputBuffer;
}
ByteBuffer pull() {
if (context[0] == 0) {
throw new IllegalStateException("brotli encoder is already destroyed");
}
if (!isSuccess() || !hasMoreOutput()) {
throw new IllegalStateException("pulling while data is not ready");
}
fresh = false;
return nativePull(context);
}
/**
* Releases native resources.
*/
void destroy() {
if (context[0] == 0) {
throw new IllegalStateException("brotli encoder is already destroyed");
}
nativeDestroy(context);
context[0] = 0;
}
@Override
protected void finalize() throws Throwable {
if (context[0] != 0) {
/* TODO: log resource leak? */
destroy();
}
super.finalize();
}
}
}
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