mirror of
https://github.com/roytam1/palemoon27.git
synced 2026-06-03 14:40:26 +00:00
Moonchild
400 lines
14 KiB
Java
400 lines
14 KiB
Java
/*
|
|
* ====================================================================
|
|
* 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 ch.boye.httpclientandroidlib.impl.io;
|
|
|
|
import java.io.IOException;
|
|
import java.io.InputStream;
|
|
import java.nio.ByteBuffer;
|
|
import java.nio.CharBuffer;
|
|
import java.nio.charset.CharsetDecoder;
|
|
import java.nio.charset.CoderResult;
|
|
|
|
import ch.boye.httpclientandroidlib.MessageConstraintException;
|
|
import ch.boye.httpclientandroidlib.annotation.NotThreadSafe;
|
|
import ch.boye.httpclientandroidlib.config.MessageConstraints;
|
|
import ch.boye.httpclientandroidlib.io.BufferInfo;
|
|
import ch.boye.httpclientandroidlib.io.HttpTransportMetrics;
|
|
import ch.boye.httpclientandroidlib.io.SessionInputBuffer;
|
|
import ch.boye.httpclientandroidlib.protocol.HTTP;
|
|
import ch.boye.httpclientandroidlib.util.Args;
|
|
import ch.boye.httpclientandroidlib.util.Asserts;
|
|
import ch.boye.httpclientandroidlib.util.ByteArrayBuffer;
|
|
import ch.boye.httpclientandroidlib.util.CharArrayBuffer;
|
|
|
|
/**
|
|
* Abstract base class for session input buffers that stream data from
|
|
* an arbitrary {@link InputStream}. This class buffers input data in
|
|
* an internal byte array for optimal input performance.
|
|
* <p/>
|
|
* {@link #readLine(CharArrayBuffer)} and {@link #readLine()} methods of this
|
|
* class treat a lone LF as valid line delimiters in addition to CR-LF required
|
|
* by the HTTP specification.
|
|
*
|
|
* @since 4.3
|
|
*/
|
|
@NotThreadSafe
|
|
public class SessionInputBufferImpl implements SessionInputBuffer, BufferInfo {
|
|
|
|
private final HttpTransportMetricsImpl metrics;
|
|
private final byte[] buffer;
|
|
private final ByteArrayBuffer linebuffer;
|
|
private final int minChunkLimit;
|
|
private final MessageConstraints constraints;
|
|
private final CharsetDecoder decoder;
|
|
|
|
private InputStream instream;
|
|
private int bufferpos;
|
|
private int bufferlen;
|
|
private CharBuffer cbuf;
|
|
|
|
/**
|
|
* Creates new instance of SessionInputBufferImpl.
|
|
*
|
|
* @param metrics HTTP transport metrics.
|
|
* @param buffersize buffer size. Must be a positive number.
|
|
* @param minChunkLimit size limit below which data chunks should be buffered in memory
|
|
* in order to minimize native method invocations on the underlying network socket.
|
|
* The optimal value of this parameter can be platform specific and defines a trade-off
|
|
* between performance of memory copy operations and that of native method invocation.
|
|
* If negative default chunk limited will be used.
|
|
* @param constraints Message constraints. If <code>null</code>
|
|
* {@link MessageConstraints#DEFAULT} will be used.
|
|
* @param chardecoder chardecoder to be used for decoding HTTP protocol elements.
|
|
* If <code>null</code> simple type cast will be used for byte to char conversion.
|
|
*/
|
|
public SessionInputBufferImpl(
|
|
final HttpTransportMetricsImpl metrics,
|
|
final int buffersize,
|
|
final int minChunkLimit,
|
|
final MessageConstraints constraints,
|
|
final CharsetDecoder chardecoder) {
|
|
Args.notNull(metrics, "HTTP transport metrcis");
|
|
Args.positive(buffersize, "Buffer size");
|
|
this.metrics = metrics;
|
|
this.buffer = new byte[buffersize];
|
|
this.bufferpos = 0;
|
|
this.bufferlen = 0;
|
|
this.minChunkLimit = minChunkLimit >= 0 ? minChunkLimit : 512;
|
|
this.constraints = constraints != null ? constraints : MessageConstraints.DEFAULT;
|
|
this.linebuffer = new ByteArrayBuffer(buffersize);
|
|
this.decoder = chardecoder;
|
|
}
|
|
|
|
public SessionInputBufferImpl(
|
|
final HttpTransportMetricsImpl metrics,
|
|
final int buffersize) {
|
|
this(metrics, buffersize, buffersize, null, null);
|
|
}
|
|
|
|
public void bind(final InputStream instream) {
|
|
this.instream = instream;
|
|
}
|
|
|
|
public boolean isBound() {
|
|
return this.instream != null;
|
|
}
|
|
|
|
public int capacity() {
|
|
return this.buffer.length;
|
|
}
|
|
|
|
public int length() {
|
|
return this.bufferlen - this.bufferpos;
|
|
}
|
|
|
|
public int available() {
|
|
return capacity() - length();
|
|
}
|
|
|
|
private int streamRead(final byte[] b, final int off, final int len) throws IOException {
|
|
Asserts.notNull(this.instream, "Input stream");
|
|
return this.instream.read(b, off, len);
|
|
}
|
|
|
|
public int fillBuffer() throws IOException {
|
|
// compact the buffer if necessary
|
|
if (this.bufferpos > 0) {
|
|
final int len = this.bufferlen - this.bufferpos;
|
|
if (len > 0) {
|
|
System.arraycopy(this.buffer, this.bufferpos, this.buffer, 0, len);
|
|
}
|
|
this.bufferpos = 0;
|
|
this.bufferlen = len;
|
|
}
|
|
final int l;
|
|
final int off = this.bufferlen;
|
|
final int len = this.buffer.length - off;
|
|
l = streamRead(this.buffer, off, len);
|
|
if (l == -1) {
|
|
return -1;
|
|
} else {
|
|
this.bufferlen = off + l;
|
|
this.metrics.incrementBytesTransferred(l);
|
|
return l;
|
|
}
|
|
}
|
|
|
|
public boolean hasBufferedData() {
|
|
return this.bufferpos < this.bufferlen;
|
|
}
|
|
|
|
public void clear() {
|
|
this.bufferpos = 0;
|
|
this.bufferlen = 0;
|
|
}
|
|
|
|
public int read() throws IOException {
|
|
int noRead;
|
|
while (!hasBufferedData()) {
|
|
noRead = fillBuffer();
|
|
if (noRead == -1) {
|
|
return -1;
|
|
}
|
|
}
|
|
return this.buffer[this.bufferpos++] & 0xff;
|
|
}
|
|
|
|
public int read(final byte[] b, final int off, final int len) throws IOException {
|
|
if (b == null) {
|
|
return 0;
|
|
}
|
|
if (hasBufferedData()) {
|
|
final int chunk = Math.min(len, this.bufferlen - this.bufferpos);
|
|
System.arraycopy(this.buffer, this.bufferpos, b, off, chunk);
|
|
this.bufferpos += chunk;
|
|
return chunk;
|
|
}
|
|
// If the remaining capacity is big enough, read directly from the
|
|
// underlying input stream bypassing the buffer.
|
|
if (len > this.minChunkLimit) {
|
|
final int read = streamRead(b, off, len);
|
|
if (read > 0) {
|
|
this.metrics.incrementBytesTransferred(read);
|
|
}
|
|
return read;
|
|
} else {
|
|
// otherwise read to the buffer first
|
|
while (!hasBufferedData()) {
|
|
final int noRead = fillBuffer();
|
|
if (noRead == -1) {
|
|
return -1;
|
|
}
|
|
}
|
|
final int chunk = Math.min(len, this.bufferlen - this.bufferpos);
|
|
System.arraycopy(this.buffer, this.bufferpos, b, off, chunk);
|
|
this.bufferpos += chunk;
|
|
return chunk;
|
|
}
|
|
}
|
|
|
|
public int read(final byte[] b) throws IOException {
|
|
if (b == null) {
|
|
return 0;
|
|
}
|
|
return read(b, 0, b.length);
|
|
}
|
|
|
|
private int locateLF() {
|
|
for (int i = this.bufferpos; i < this.bufferlen; i++) {
|
|
if (this.buffer[i] == HTTP.LF) {
|
|
return i;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* Reads a complete line of characters up to a line delimiter from this
|
|
* session buffer into the given line buffer. The number of chars actually
|
|
* read is returned as an integer. The line delimiter itself is discarded.
|
|
* If no char is available because the end of the stream has been reached,
|
|
* the value <code>-1</code> is returned. This method blocks until input
|
|
* data is available, end of file is detected, or an exception is thrown.
|
|
* <p>
|
|
* This method treats a lone LF as a valid line delimiters in addition
|
|
* to CR-LF required by the HTTP specification.
|
|
*
|
|
* @param charbuffer the line buffer.
|
|
* @return one line of characters
|
|
* @exception IOException if an I/O error occurs.
|
|
*/
|
|
public int readLine(final CharArrayBuffer charbuffer) throws IOException {
|
|
Args.notNull(charbuffer, "Char array buffer");
|
|
int noRead = 0;
|
|
boolean retry = true;
|
|
while (retry) {
|
|
// attempt to find end of line (LF)
|
|
final int i = locateLF();
|
|
if (i != -1) {
|
|
// end of line found.
|
|
if (this.linebuffer.isEmpty()) {
|
|
// the entire line is preset in the read buffer
|
|
return lineFromReadBuffer(charbuffer, i);
|
|
}
|
|
retry = false;
|
|
final int len = i + 1 - this.bufferpos;
|
|
this.linebuffer.append(this.buffer, this.bufferpos, len);
|
|
this.bufferpos = i + 1;
|
|
} else {
|
|
// end of line not found
|
|
if (hasBufferedData()) {
|
|
final int len = this.bufferlen - this.bufferpos;
|
|
this.linebuffer.append(this.buffer, this.bufferpos, len);
|
|
this.bufferpos = this.bufferlen;
|
|
}
|
|
noRead = fillBuffer();
|
|
if (noRead == -1) {
|
|
retry = false;
|
|
}
|
|
}
|
|
final int maxLineLen = this.constraints.getMaxLineLength();
|
|
if (maxLineLen > 0 && this.linebuffer.length() >= maxLineLen) {
|
|
throw new MessageConstraintException("Maximum line length limit exceeded");
|
|
}
|
|
}
|
|
if (noRead == -1 && this.linebuffer.isEmpty()) {
|
|
// indicate the end of stream
|
|
return -1;
|
|
}
|
|
return lineFromLineBuffer(charbuffer);
|
|
}
|
|
|
|
/**
|
|
* Reads a complete line of characters up to a line delimiter from this
|
|
* session buffer. The line delimiter itself is discarded. If no char is
|
|
* available because the end of the stream has been reached,
|
|
* <code>null</code> is returned. This method blocks until input data is
|
|
* available, end of file is detected, or an exception is thrown.
|
|
* <p>
|
|
* This method treats a lone LF as a valid line delimiters in addition
|
|
* to CR-LF required by the HTTP specification.
|
|
*
|
|
* @return HTTP line as a string
|
|
* @exception IOException if an I/O error occurs.
|
|
*/
|
|
private int lineFromLineBuffer(final CharArrayBuffer charbuffer)
|
|
throws IOException {
|
|
// discard LF if found
|
|
int len = this.linebuffer.length();
|
|
if (len > 0) {
|
|
if (this.linebuffer.byteAt(len - 1) == HTTP.LF) {
|
|
len--;
|
|
}
|
|
// discard CR if found
|
|
if (len > 0) {
|
|
if (this.linebuffer.byteAt(len - 1) == HTTP.CR) {
|
|
len--;
|
|
}
|
|
}
|
|
}
|
|
if (this.decoder == null) {
|
|
charbuffer.append(this.linebuffer, 0, len);
|
|
} else {
|
|
final ByteBuffer bbuf = ByteBuffer.wrap(this.linebuffer.buffer(), 0, len);
|
|
len = appendDecoded(charbuffer, bbuf);
|
|
}
|
|
this.linebuffer.clear();
|
|
return len;
|
|
}
|
|
|
|
private int lineFromReadBuffer(final CharArrayBuffer charbuffer, final int position)
|
|
throws IOException {
|
|
int pos = position;
|
|
final int off = this.bufferpos;
|
|
int len;
|
|
this.bufferpos = pos + 1;
|
|
if (pos > off && this.buffer[pos - 1] == HTTP.CR) {
|
|
// skip CR if found
|
|
pos--;
|
|
}
|
|
len = pos - off;
|
|
if (this.decoder == null) {
|
|
charbuffer.append(this.buffer, off, len);
|
|
} else {
|
|
final ByteBuffer bbuf = ByteBuffer.wrap(this.buffer, off, len);
|
|
len = appendDecoded(charbuffer, bbuf);
|
|
}
|
|
return len;
|
|
}
|
|
|
|
private int appendDecoded(
|
|
final CharArrayBuffer charbuffer, final ByteBuffer bbuf) throws IOException {
|
|
if (!bbuf.hasRemaining()) {
|
|
return 0;
|
|
}
|
|
if (this.cbuf == null) {
|
|
this.cbuf = CharBuffer.allocate(1024);
|
|
}
|
|
this.decoder.reset();
|
|
int len = 0;
|
|
while (bbuf.hasRemaining()) {
|
|
final CoderResult result = this.decoder.decode(bbuf, this.cbuf, true);
|
|
len += handleDecodingResult(result, charbuffer, bbuf);
|
|
}
|
|
final CoderResult result = this.decoder.flush(this.cbuf);
|
|
len += handleDecodingResult(result, charbuffer, bbuf);
|
|
this.cbuf.clear();
|
|
return len;
|
|
}
|
|
|
|
private int handleDecodingResult(
|
|
final CoderResult result,
|
|
final CharArrayBuffer charbuffer,
|
|
final ByteBuffer bbuf) throws IOException {
|
|
if (result.isError()) {
|
|
result.throwException();
|
|
}
|
|
this.cbuf.flip();
|
|
final int len = this.cbuf.remaining();
|
|
while (this.cbuf.hasRemaining()) {
|
|
charbuffer.append(this.cbuf.get());
|
|
}
|
|
this.cbuf.compact();
|
|
return len;
|
|
}
|
|
|
|
public String readLine() throws IOException {
|
|
final CharArrayBuffer charbuffer = new CharArrayBuffer(64);
|
|
final int l = readLine(charbuffer);
|
|
if (l != -1) {
|
|
return charbuffer.toString();
|
|
} else {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
public boolean isDataAvailable(final int timeout) throws IOException {
|
|
return hasBufferedData();
|
|
}
|
|
|
|
public HttpTransportMetrics getMetrics() {
|
|
return this.metrics;
|
|
}
|
|
|
|
}
|