/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apach3.http.impl.nio.reactor;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CoderResult;
import org.apach3.http.annotation.NotThreadSafe;
import org.apach3.http.nio.reactor.SessionInputBuffer;
import org.apach3.http.nio.util.ByteBufferAllocator;
import org.apach3.http.nio.util.ExpandableBuffer;
import org.apach3.http.nio.util.HeapByteBufferAllocator;
import org.apach3.http.params.HttpParams;
import org.apach3.http.params.HttpProtocolParams;
import org.apach3.http.protocol.HTTP;
import org.apach3.http.util.CharArrayBuffer;
/**
* Default implementation of {@link SessionInputBuffer} based on
* the {@link ExpandableBuffer} class.
* <p>
* The following parameters can be used to customize the behavior of this
* class:
* <ul>
* <li>{@link org.apach3.http.params.CoreProtocolPNames#HTTP_ELEMENT_CHARSET}</li>
* </ul>
*
* @since 4.0
*/
@NotThreadSafe
public class SessionInputBufferImpl extends ExpandableBuffer implements SessionInputBuffer {
private CharBuffer charbuffer = null;
private Charset charset = null;
private CharsetDecoder chardecoder = null;
public SessionInputBufferImpl(
int buffersize,
int linebuffersize,
final ByteBufferAllocator allocator,
final HttpParams params) {
super(buffersize, allocator);
this.charbuffer = CharBuffer.allocate(linebuffersize);
this.charset = Charset.forName(HttpProtocolParams.getHttpElementCharset(params));
this.chardecoder = this.charset.newDecoder();
this.chardecoder.onMalformedInput(HttpProtocolParams.getMalformedInputAction(params));
this.chardecoder.onUnmappableCharacter(HttpProtocolParams.getUnmappableInputAction(params));
}
public SessionInputBufferImpl(
int buffersize,
int linebuffersize,
final HttpParams params) {
this(buffersize, linebuffersize, new HeapByteBufferAllocator(), params);
}
public int fill(final ReadableByteChannel channel) throws IOException {
if (channel == null) {
throw new IllegalArgumentException("Channel may not be null");
}
setInputMode();
if (!this.buffer.hasRemaining()) {
expand();
}
int readNo = channel.read(this.buffer);
return readNo;
}
public int read() {
setOutputMode();
return this.buffer.get() & 0xff;
}
public int read(final ByteBuffer dst, int maxLen) {
if (dst == null) {
return 0;
}
setOutputMode();
int len = Math.min(dst.remaining(), maxLen);
int chunk = Math.min(this.buffer.remaining(), len);
for (int i = 0; i < chunk; i++) {
dst.put(this.buffer.get());
}
return chunk;
}
public int read(final ByteBuffer dst) {
if (dst == null) {
return 0;
}
return read(dst, dst.remaining());
}
public int read(final WritableByteChannel dst, int maxLen) throws IOException {
if (dst == null) {
return 0;
}
setOutputMode();
int bytesRead;
if (this.buffer.remaining() > maxLen) {
int oldLimit = this.buffer.limit();
int newLimit = oldLimit - (this.buffer.remaining() - maxLen);
this.buffer.limit(newLimit);
bytesRead = dst.write(this.buffer);
this.buffer.limit(oldLimit);
} else {
bytesRead = dst.write(this.buffer);
}
return bytesRead;
}
public int read(final WritableByteChannel dst) throws IOException {
if (dst == null) {
return 0;
}
setOutputMode();
return dst.write(this.buffer);
}
public boolean readLine(
final CharArrayBuffer linebuffer,
boolean endOfStream) throws CharacterCodingException {
setOutputMode();
// See if there is LF char present in the buffer
int pos = -1;
boolean hasLine = false;
for (int i = this.buffer.position(); i < this.buffer.limit(); i++) {
int b = this.buffer.get(i);
if (b == HTTP.LF) {
hasLine = true;
pos = i + 1;
break;
}
}
if (!hasLine) {
if (endOfStream && this.buffer.hasRemaining()) {
// No more data. Get the rest
pos = this.buffer.limit();
} else {
// Either no complete line present in the buffer
// or no more data is expected
return false;
}
}
int origLimit = this.buffer.limit();
this.buffer.limit(pos);
int len = this.buffer.limit() - this.buffer.position();
// Ensure capacity of len assuming ASCII as the most likely charset
linebuffer.ensureCapacity(len);
this.chardecoder.reset();
for (;;) {
CoderResult result = this.chardecoder.decode(
this.buffer,
this.charbuffer,
true);
if (result.isError()) {
result.throwException();
}
if (result.isOverflow()) {
this.charbuffer.flip();
linebuffer.append(
this.charbuffer.array(),
this.charbuffer.position(),
this.charbuffer.remaining());
this.charbuffer.clear();
}
if (result.isUnderflow()) {
break;
}
}
this.buffer.limit(origLimit);
// flush the decoder
this.chardecoder.flush(this.charbuffer);
this.charbuffer.flip();
// append the decoded content to the line buffer
if (this.charbuffer.hasRemaining()) {
linebuffer.append(
this.charbuffer.array(),
this.charbuffer.position(),
this.charbuffer.remaining());
}
// discard LF if found
int l = linebuffer.length();
if (l > 0) {
if (linebuffer.charAt(l - 1) == HTTP.LF) {
l--;
linebuffer.setLength(l);
}
// discard CR if found
if (l > 0) {
if (linebuffer.charAt(l - 1) == HTTP.CR) {
l--;
linebuffer.setLength(l);
}
}
}
return true;
}
public String readLine(boolean endOfStream) throws CharacterCodingException {
CharArrayBuffer charbuffer = new CharArrayBuffer(64);
boolean found = readLine(charbuffer, endOfStream);
if (found) {
return charbuffer.toString();
} else {
return null;
}
}
}