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/*
* 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.
*/
package org.apache.catalina.connector;
import java.io.IOException;
import java.io.Reader;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.catalina.security.SecurityUtil;
import org.apache.coyote.ActionCode;
import org.apache.coyote.Request;
import org.apache.tomcat.util.buf.B2CConverter;
import org.apache.tomcat.util.buf.ByteChunk;
import org.apache.tomcat.util.buf.CharChunk;
import org.apache.tomcat.util.res.StringManager;
/**
* The buffer used by Tomcat request. This is a derivative of the Tomcat 3.3
* OutputBuffer, adapted to handle input instead of output. This allows
* complete recycling of the facade objects (the ServletInputStream and the
* BufferedReader).
*
* @author Remy Maucherat
*/
public class InputBuffer extends Reader
implements ByteChunk.ByteInputChannel, CharChunk.CharInputChannel,
CharChunk.CharOutputChannel {
/**
* The string manager for this package.
*/
protected static final StringManager sm =
StringManager.getManager(Constants.Package);
// -------------------------------------------------------------- Constants
public static final String DEFAULT_ENCODING =
org.apache.coyote.Constants.DEFAULT_CHARACTER_ENCODING;
public static final int DEFAULT_BUFFER_SIZE = 8*1024;
// The buffer can be used for byte[] and char[] reading
// ( this is needed to support ServletInputStream and BufferedReader )
public final int INITIAL_STATE = 0;
public final int CHAR_STATE = 1;
public final int BYTE_STATE = 2;
// ----------------------------------------------------- Instance Variables
/**
* The byte buffer.
*/
private final ByteChunk bb;
/**
* The chunk buffer.
*/
private CharChunk cb;
/**
* State of the output buffer.
*/
private int state = 0;
/**
* Flag which indicates if the input buffer is closed.
*/
private boolean closed = false;
/**
* Encoding to use.
*/
private String enc;
/**
* Encoder is set.
*/
private boolean gotEnc = false;
/**
* List of encoders.
*/
private final Map encoders = new ConcurrentHashMap();
/**
* Current byte to char converter.
*/
protected B2CConverter conv;
/**
* Associated Coyote request.
*/
private Request coyoteRequest;
/**
* Buffer position.
*/
private int markPos = -1;
/**
* Buffer size.
*/
private int size = -1;
// ----------------------------------------------------------- Constructors
/**
* Default constructor. Allocate the buffer with the default buffer size.
*/
public InputBuffer() {
this(DEFAULT_BUFFER_SIZE);
}
/**
* Alternate constructor which allows specifying the initial buffer size.
*
* @param size Buffer size to use
*/
public InputBuffer(int size) {
this.size = size;
bb = new ByteChunk(size);
bb.setLimit(size);
bb.setByteInputChannel(this);
cb = new CharChunk(size);
cb.setLimit(size);
cb.setOptimizedWrite(false);
cb.setCharInputChannel(this);
cb.setCharOutputChannel(this);
}
// ------------------------------------------------------------- Properties
/**
* Associated Coyote request.
*
* @param coyoteRequest Associated Coyote request
*/
public void setRequest(Request coyoteRequest) {
this.coyoteRequest = coyoteRequest;
}
/**
* Get associated Coyote request.
*
* @return the associated Coyote request
*/
@Deprecated
public Request getRequest() {
return this.coyoteRequest;
}
// --------------------------------------------------------- Public Methods
/**
* Recycle the output buffer.
*/
public void recycle() {
state = INITIAL_STATE;
// If usage of mark made the buffer too big, reallocate it
if (cb.getChars().length > size) {
cb = new CharChunk(size);
cb.setLimit(size);
cb.setOptimizedWrite(false);
cb.setCharInputChannel(this);
cb.setCharOutputChannel(this);
} else {
cb.recycle();
}
markPos = -1;
bb.recycle();
closed = false;
if (conv != null) {
conv.recycle();
}
gotEnc = false;
enc = null;
}
/**
* Clear cached encoders (to save memory for Comet requests).
*/
public void clearEncoders() {
encoders.clear();
}
/**
* Close the input buffer.
*
* @throws IOException An underlying IOException occurred
*/
@Override
public void close()
throws IOException {
closed = true;
}
public int available() {
int available = 0;
if (state == BYTE_STATE) {
available = bb.getLength();
} else if (state == CHAR_STATE) {
available = cb.getLength();
}
if (available == 0) {
coyoteRequest.action(ActionCode.AVAILABLE, null);
available = (coyoteRequest.getAvailable() > 0) ? 1 : 0;
}
return available;
}
// ------------------------------------------------- Bytes Handling Methods
/**
* Reads new bytes in the byte chunk.
*
* @param cbuf Byte buffer to be written to the response
* @param off Offset
* @param len Length
*
* @throws IOException An underlying IOException occurred
*/
@Override
public int realReadBytes(byte cbuf[], int off, int len)
throws IOException {
if (closed) {
return -1;
}
if (coyoteRequest == null) {
return -1;
}
if(state == INITIAL_STATE) {
state = BYTE_STATE;
}
int result = coyoteRequest.doRead(bb);
return result;
}
public int readByte()
throws IOException {
if (closed) {
throw new IOException(sm.getString("inputBuffer.streamClosed"));
}
return bb.substract();
}
public int read(byte[] b, int off, int len)
throws IOException {
if (closed) {
throw new IOException(sm.getString("inputBuffer.streamClosed"));
}
return bb.substract(b, off, len);
}
// ------------------------------------------------- Chars Handling Methods
/**
* Since the converter will use append, it is possible to get chars to
* be removed from the buffer for "writing". Since the chars have already
* been read before, they are ignored. If a mark was set, then the
* mark is lost.
*/
@Override
public void realWriteChars(char c[], int off, int len)
throws IOException {
markPos = -1;
cb.setOffset(0);
cb.setEnd(0);
}
public void setEncoding(String s) {
enc = s;
}
@Override
public int realReadChars(char cbuf[], int off, int len)
throws IOException {
if (!gotEnc) {
setConverter();
}
boolean eof = false;
if (bb.getLength() <= 0) {
int nRead = realReadBytes(bb.getBytes(), 0, bb.getBytes().length);
if (nRead < 0) {
eof = true;
}
}
if (markPos == -1) {
cb.setOffset(0);
cb.setEnd(0);
} else {
// Make sure there's enough space in the worst case
cb.makeSpace(bb.getLength());
if ((cb.getBuffer().length - cb.getEnd()) == 0 && bb.getLength() != 0) {
// We went over the limit
cb.setOffset(0);
cb.setEnd(0);
markPos = -1;
}
}
state = CHAR_STATE;
conv.convert(bb, cb, eof);
if (cb.getLength() == 0 && eof) {
return -1;
} else {
return cb.getLength();
}
}
@Override
public int read()
throws IOException {
if (closed) {
throw new IOException(sm.getString("inputBuffer.streamClosed"));
}
return cb.substract();
}
@Override
public int read(char[] cbuf)
throws IOException {
if (closed) {
throw new IOException(sm.getString("inputBuffer.streamClosed"));
}
return read(cbuf, 0, cbuf.length);
}
@Override
public int read(char[] cbuf, int off, int len)
throws IOException {
if (closed) {
throw new IOException(sm.getString("inputBuffer.streamClosed"));
}
return cb.substract(cbuf, off, len);
}
@Override
public long skip(long n)
throws IOException {
if (closed) {
throw new IOException(sm.getString("inputBuffer.streamClosed"));
}
if (n < 0) {
throw new IllegalArgumentException();
}
long nRead = 0;
while (nRead < n) {
if (cb.getLength() >= n) {
cb.setOffset(cb.getStart() + (int) n);
nRead = n;
} else {
nRead += cb.getLength();
cb.setOffset(cb.getEnd());
int toRead = 0;
if (cb.getChars().length < (n - nRead)) {
toRead = cb.getChars().length;
} else {
toRead = (int) (n - nRead);
}
int nb = realReadChars(cb.getChars(), 0, toRead);
if (nb < 0) {
break;
}
}
}
return nRead;
}
@Override
public boolean ready()
throws IOException {
if (closed) {
throw new IOException(sm.getString("inputBuffer.streamClosed"));
}
return (available() > 0);
}
@Override
public boolean markSupported() {
return true;
}
@Override
public void mark(int readAheadLimit)
throws IOException {
if (closed) {
throw new IOException(sm.getString("inputBuffer.streamClosed"));
}
if (cb.getLength() <= 0) {
cb.setOffset(0);
cb.setEnd(0);
} else {
if ((cb.getBuffer().length > (2 * size))
&& (cb.getLength()) < (cb.getStart())) {
System.arraycopy(cb.getBuffer(), cb.getStart(),
cb.getBuffer(), 0, cb.getLength());
cb.setEnd(cb.getLength());
cb.setOffset(0);
}
}
cb.setLimit(cb.getStart() + readAheadLimit + size);
markPos = cb.getStart();
}
@Override
public void reset()
throws IOException {
if (closed) {
throw new IOException(sm.getString("inputBuffer.streamClosed"));
}
if (state == CHAR_STATE) {
if (markPos < 0) {
cb.recycle();
markPos = -1;
throw new IOException();
} else {
cb.setOffset(markPos);
}
} else {
bb.recycle();
}
}
public void checkConverter()
throws IOException {
if (!gotEnc) {
setConverter();
}
}
protected void setConverter()
throws IOException {
if (coyoteRequest != null) {
enc = coyoteRequest.getCharacterEncoding();
}
gotEnc = true;
if (enc == null) {
enc = DEFAULT_ENCODING;
}
conv = encoders.get(enc);
if (conv == null) {
if (SecurityUtil.isPackageProtectionEnabled()){
try{
conv = AccessController.doPrivileged(
new PrivilegedExceptionAction(){
@Override
public B2CConverter run() throws IOException {
return new B2CConverter(enc);
}
}
);
}catch(PrivilegedActionException ex){
Exception e = ex.getException();
if (e instanceof IOException) {
throw (IOException)e;
}
}
} else {
conv = new B2CConverter(enc);
}
encoders.put(enc, conv);
}
}
}
