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/*
* Copyright (c) 2010, 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package com.sun.media.jfxmedia.locator;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.net.HttpURLConnection;
import java.net.JarURLConnection;
import java.net.URI;
import java.net.URLConnection;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.FileChannel;
import java.nio.channels.ReadableByteChannel;
import java.util.Map;
/**
* Connection holders hold and maintain connection do different kinds of sources
*
*/
public abstract class ConnectionHolder {
private static int DEFAULT_BUFFER_SIZE = 4096;
ReadableByteChannel channel;
ByteBuffer buffer = ByteBuffer.allocateDirect(DEFAULT_BUFFER_SIZE);
static ConnectionHolder createMemoryConnectionHolder(ByteBuffer buffer) {
return new MemoryConnectionHolder(buffer);
}
static ConnectionHolder createURIConnectionHolder(URI uri, Map connectionProperties) throws IOException {
return new URIConnectionHolder(uri, connectionProperties);
}
static ConnectionHolder createFileConnectionHolder(URI uri) throws IOException {
return new FileConnectionHolder(uri);
}
static ConnectionHolder createHLSConnectionHolder(URI uri) {
return new HLSConnectionHolder(uri);
}
/**
* Reads a block of data from the current position of the opened stream.
*
* @return The number of bytes read, possibly zero, or -1 if the channel
* has reached end-of-stream.
*
* @throws ClosedChannelException if an attempt is made to read after
* closeConnection has been called
*/
public int readNextBlock() throws IOException {
buffer.rewind();
if (buffer.limit() < buffer.capacity()) {
buffer.limit(buffer.capacity());
}
// avoid NPE if channel does not exist or has been closed
if (null == channel) {
throw new ClosedChannelException();
}
return channel.read(buffer);
}
public ByteBuffer getBuffer() {
return buffer;
}
/**
* Reads a block of data from the arbitrary position of the opened stream.
*
* @return The number of bytes read, possibly zero, or -1 if the given position
* is greater than or equal to the file's current size.
*
* @throws ClosedChannelException if an attempt is made to read after
* closeConnection has been called
*/
abstract int readBlock(long position, int size) throws IOException;
/**
* Detects whether this source needs buffering at the pipeline level.
* When true the pipeline contains progressbuffer after the source.
*
* @return true if the source needs a buffer, false otherwise.
*/
abstract boolean needBuffer();
/**
* Detects whether the source is seekable.
* @return true if the source is seekable, false otherwise.
*/
abstract boolean isSeekable();
/**
* Detects whether the source is a random access source. If the method returns
* true then the source is capable of working in pull mode. To be able to work
* in pull mode holder must provide implementation.
* @return true is the source is random access, false otherwise.
*/
abstract boolean isRandomAccess();
/**
* Performs a seek request to the desired position.
*
* @return -1 if the seek request failed or new stream position
*/
public abstract long seek(long position);
/**
* Closes connection when done.
* Overriding methods should call this method in the beginning of their implementation.
*/
public void closeConnection() {
try {
if (channel != null) {
channel.close();
}
} catch (IOException ioex) {}
finally {
channel = null;
}
}
/**
* Get or set properties.
*
* @param prop - Property ID.
* @param value - Depends on property ID.
* @return - Depends on property ID.
*/
int property(int prop, int value) {
return 0;
}
/**
* Returns ConnectionHolder for additional audio stream if any.
* Currently used by HLS with EXT-X-MEDIA tag.
*/
public ConnectionHolder getAudioStream() {
return null;
}
private static class FileConnectionHolder extends ConnectionHolder {
private RandomAccessFile file = null;
FileConnectionHolder(URI uri) throws IOException {
channel = openFile(uri);
}
@Override
boolean needBuffer() {
return false;
}
@Override
boolean isRandomAccess() {
return true;
}
@Override
boolean isSeekable() {
return true;
}
@Override
public long seek(long position) {
try {
((FileChannel)channel).position(position);
return position;
} catch(IOException ioex) {
return -1;
}
}
@Override
int readBlock(long position, int size) throws IOException {
if (null == channel) {
throw new ClosedChannelException();
}
if (buffer.capacity() < size) {
buffer = ByteBuffer.allocateDirect(size);
}
buffer.rewind().limit(size);
return ((FileChannel)channel).read(buffer, position);
}
private ReadableByteChannel openFile(final URI uri) throws IOException {
if (file != null) {
file.close();
}
file = new RandomAccessFile(new File(uri), "r");
return file.getChannel();
}
@Override
public void closeConnection() {
super.closeConnection();
if (file != null) {
try {
file.close();
} catch (IOException ex) {
} finally {
file = null;
}
}
}
}
private static class URIConnectionHolder extends ConnectionHolder {
private URI uri;
private URLConnection urlConnection;
URIConnectionHolder(URI uri, Map connectionProperties) throws IOException {
this.uri = uri;
urlConnection = uri.toURL().openConnection();
if (connectionProperties != null) {
for(Map.Entry entry : connectionProperties.entrySet()) {
Object value = entry.getValue();
if (value instanceof String) {
urlConnection.setRequestProperty(entry.getKey(), (String)value);
}
}
}
channel = openChannel(null);
}
@Override
boolean needBuffer() {
String scheme = uri.getScheme().toLowerCase();
return ("http".equals(scheme) || "https".equals(scheme));
}
@Override
boolean isSeekable() {
return (urlConnection instanceof HttpURLConnection) ||
(urlConnection instanceof JarURLConnection) ||
isJRT() || isResource();
}
@Override
boolean isRandomAccess() {
return false;
}
@Override
int readBlock(long position, int size) throws IOException {
throw new IOException();
}
@Override
public long seek(long position) {
if (urlConnection instanceof HttpURLConnection) {
URLConnection tmpURLConnection = null;
//closeConnection();
try{
tmpURLConnection = uri.toURL().openConnection();
HttpURLConnection httpConnection = (HttpURLConnection)tmpURLConnection;
httpConnection.setRequestMethod("GET");
httpConnection.setUseCaches(false);
httpConnection.setRequestProperty("Range", "bytes=" + position + "-");
// If range request worked properly we should get responce code 206 (HTTP_PARTIAL)
// Else fail seek and let progressbuffer to download all data. It is pointless for us to download it and throw away.
if (httpConnection.getResponseCode() == HttpURLConnection.HTTP_PARTIAL) {
closeConnection();
urlConnection = tmpURLConnection;
tmpURLConnection = null;
channel = openChannel(null);
return position;
} else {
return -1;
}
} catch (IOException ioex) {
return -1;
} finally {
if (tmpURLConnection != null) {
Locator.closeConnection(tmpURLConnection);
}
}
} else if ((urlConnection instanceof JarURLConnection) || isJRT() || isResource()) {
try {
closeConnection();
urlConnection = uri.toURL().openConnection();
// Skip data that we do not need
long skip_left = position;
InputStream inputStream = urlConnection.getInputStream();
do {
long skip = inputStream.skip(skip_left);
skip_left -= skip;
} while (skip_left > 0);
channel = openChannel(inputStream);
return position;
} catch (IOException ioex) {
return -1;
}
}
return -1;
}
@Override
public void closeConnection() {
super.closeConnection();
Locator.closeConnection(urlConnection);
urlConnection = null;
}
private ReadableByteChannel openChannel(InputStream inputStream) throws IOException {
return (inputStream == null) ?
Channels.newChannel(urlConnection.getInputStream()) :
Channels.newChannel(inputStream);
}
private boolean isJRT() {
String scheme = uri.getScheme().toLowerCase();
return "jrt".equals(scheme);
}
private boolean isResource() {
String scheme = uri.getScheme().toLowerCase();
return "resource".equals(scheme);
}
}
// A "ConnectionHolder" that "reads" from a ByteBuffer, generally loaded from
// some unsupported or buggy source
private static class MemoryConnectionHolder extends ConnectionHolder {
private final ByteBuffer backingBuffer;
public MemoryConnectionHolder(ByteBuffer buf) {
if (null == buf) {
throw new IllegalArgumentException("Can't connect to null buffer...");
}
if (buf.isDirect()) {
// we can use it, or rather a duplicate directly
backingBuffer = buf.duplicate();
} else {
// operate on a copy of the buffer
backingBuffer = ByteBuffer.allocateDirect(buf.capacity());
backingBuffer.put(buf);
}
// rewind since the default position is expected to be at zero
backingBuffer.rewind();
// readNextBlock should never be called since we're random access
// but just to be safe (and for unit tests...)
channel = new ReadableByteChannel() {
@Override
public int read(ByteBuffer bb) throws IOException {
if (backingBuffer.remaining() <= 0) {
return -1; // EOS
}
int actual;
if (bb.equals(buffer)) {
// we'll cheat here as we know that bb is buffer and rather
// than copy the data, just slice it like for readBlock
actual = Math.min(DEFAULT_BUFFER_SIZE, backingBuffer.remaining());
if (actual > 0) {
buffer = backingBuffer.slice();
buffer.limit(actual);
}
} else {
actual = Math.min(bb.remaining(), backingBuffer.remaining());
if (actual > 0) {
backingBuffer.limit(backingBuffer.position() + actual);
bb.put(backingBuffer);
backingBuffer.limit(backingBuffer.capacity());
}
}
return actual;
}
@Override
public boolean isOpen() {
return true; // open 24/7/365
}
@Override
public void close() throws IOException {
// never closed...
}
};
}
@Override
int readBlock(long position, int size) throws IOException {
// mimic stream behavior
if (null == channel) {
throw new ClosedChannelException();
}
if ((int)position > backingBuffer.capacity()) {
return -1; //EOS
}
backingBuffer.position((int)position);
buffer = backingBuffer.slice();
int actual = Math.min(backingBuffer.remaining(), size);
buffer.limit(actual); // only give as much as asked
backingBuffer.position(backingBuffer.position() + actual);
return actual;
}
@Override
boolean needBuffer() {
return false;
}
@Override
boolean isSeekable() {
return true;
}
@Override
boolean isRandomAccess() {
return true;
}
@Override
public long seek(long position) {
if ((int)position < backingBuffer.capacity()) {
backingBuffer.limit(backingBuffer.capacity());
backingBuffer.position((int)position);
return position;
}
return -1;
}
@Override
public void closeConnection() {
// more stream behavior mimicry
channel = null;
}
}
}
