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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.geckoview;
import androidx.annotation.AnyThread;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.util.LinkedList;
import org.mozilla.gecko.annotation.WrapForJNI;
import org.mozilla.gecko.mozglue.JNIObject;
/**
* This class provides an {@link InputStream} wrapper for a Gecko nsIChannel (or really,
* nsIRequest).
*/
@WrapForJNI
@AnyThread
/* package */ class GeckoInputStream extends InputStream {
private static final String LOGTAG = "GeckoInputStream";
private LinkedList<ByteBuffer> mBuffers = new LinkedList<>();
private boolean mEOF;
private boolean mClosed;
private boolean mHaveError;
private long mReadTimeout;
private boolean mResumed;
private Support mSupport;
/**
* This is only called via JNI. The support instance provides callbacks for the native
* counterpart.
*
* @param support An instance of {@link Support}, used for native callbacks.
*/
/* package */ GeckoInputStream(final @Nullable Support support) {
mSupport = support;
}
public void setReadTimeoutMillis(final long millis) {
mReadTimeout = millis;
}
@Override
public synchronized void close() throws IOException {
super.close();
mClosed = true;
if (mSupport != null) {
mSupport.close();
mSupport = null;
}
}
@Override
public synchronized int available() throws IOException {
if (mClosed) {
return 0;
}
final ByteBuffer buf = mBuffers.peekFirst();
return buf != null ? buf.remaining() : 0;
}
private void ensureNotClosed() throws IOException {
if (mClosed) {
throw new IOException("Stream is closed");
}
}
@Override
public synchronized int read() throws IOException {
ensureNotClosed();
final int expect = Integer.SIZE / 8;
final byte[] bytes = new byte[expect];
int count = 0;
while (count < expect) {
final long bytesRead = read(bytes, count, expect - count);
if (bytesRead < 0) {
return -1;
}
count += bytesRead;
}
final ByteBuffer buffer = ByteBuffer.wrap(bytes);
return buffer.getInt();
}
@Override
public int read(final @NonNull byte[] b) throws IOException {
return read(b, 0, b.length);
}
@Override
public synchronized int read(final @NonNull byte[] dest, final int offset, final int length)
throws IOException {
ensureNotClosed();
final long startTime = System.currentTimeMillis();
while (!mEOF && mBuffers.size() == 0) {
if (mReadTimeout > 0 && (System.currentTimeMillis() - startTime) >= mReadTimeout) {
throw new IOException("Timed out");
}
// The underlying channel is suspended, so resume that before
// waiting for a buffer.
if (!mResumed) {
if (mSupport != null) {
mSupport.resume();
}
mResumed = true;
}
try {
wait(mReadTimeout);
} catch (final InterruptedException e) {
}
}
if (mEOF && mBuffers.size() == 0) {
if (mHaveError) {
throw new IOException("Unknown error");
}
// We have no data and we're not expecting more.
return -1;
}
final ByteBuffer buf = mBuffers.peekFirst();
final int readCount = Math.min(length, buf.remaining());
buf.get(dest, offset, readCount);
if (buf.remaining() == 0) {
// We're done with this buffer, advance the queue.
mBuffers.removeFirst();
}
return readCount;
}
/** Called by native code to indicate that no more data will be sent via {@link #appendBuffer}. */
@WrapForJNI(calledFrom = "gecko")
public synchronized void sendEof() {
if (mEOF) {
throw new IllegalStateException("Already have EOF");
}
mEOF = true;
notifyAll();
}
/** Called by native code to indicate that there was an error while reading the stream. */
@WrapForJNI(calledFrom = "gecko")
public synchronized void sendError() {
if (mEOF) {
throw new IllegalStateException("Already have EOF");
}
mEOF = true;
mHaveError = true;
notifyAll();
}
/**
* Called by native code to indicate that there was an issue during appending data to the stream.
* The writing stream should still report EoF. Setting this error during writing will cause an
* IOException if readers try to read from the stream.
*/
@WrapForJNI(calledFrom = "gecko")
public synchronized void writeError() {
mHaveError = true;
notifyAll();
}
/**
* Called by native code to check if the stream is open.
*
* @return true if the stream is closed
*/
@WrapForJNI(calledFrom = "gecko")
/* package */ synchronized boolean isStreamClosed() {
return mClosed || mEOF;
}
/**
* Called by native code to provide data for this stream.
*
* @param buf the bytes
* @throws IOException
*/
@WrapForJNI(exceptionMode = "nsresult", calledFrom = "gecko")
/* package */ synchronized void appendBuffer(final byte[] buf) throws IOException {
if (mClosed) {
throw new IllegalStateException("Stream is closed");
}
if (mEOF) {
throw new IllegalStateException("EOF, no more data expected");
}
mBuffers.add(ByteBuffer.wrap(buf));
notifyAll();
}
@WrapForJNI
private static class Support extends JNIObject {
@WrapForJNI(dispatchTo = "gecko")
private native void resume();
@WrapForJNI(dispatchTo = "gecko")
private native void close();
@Override // JNIObject
protected void disposeNative() {
throw new UnsupportedOperationException();
}
}
}
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