org.apache.http.impl.io.AbstractSessionInputBuffer Maven / Gradle / Ivy
/*
* ====================================================================
* 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
*
* {@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 4.0
*
* @deprecated (4.3) use {@link SessionInputBufferImpl}
*/
@NotThreadSafe
@Deprecated
public abstract class AbstractSessionInputBuffer implements SessionInputBuffer, BufferInfo {
private InputStream instream;
private byte[] buffer;
private ByteArrayBuffer linebuffer;
private Charset charset;
private boolean ascii;
private int maxLineLen;
private int minChunkLimit;
private HttpTransportMetricsImpl metrics;
private CodingErrorAction onMalformedCharAction;
private CodingErrorAction onUnmappableCharAction;
private int bufferpos;
private int bufferlen;
private CharsetDecoder decoder;
private CharBuffer cbuf;
public AbstractSessionInputBuffer() {
}
/**
* Initializes this session input buffer.
*
* @param instream the source input stream.
* @param buffersize the size of the internal buffer.
* @param params HTTP parameters.
*/
protected void init(final InputStream instream, final int buffersize, final HttpParams params) {
Args.notNull(instream, "Input stream");
Args.notNegative(buffersize, "Buffer size");
Args.notNull(params, "HTTP parameters");
this.instream = instream;
this.buffer = new byte[buffersize];
this.bufferpos = 0;
this.bufferlen = 0;
this.linebuffer = new ByteArrayBuffer(buffersize);
final String charset = (String) params.getParameter(CoreProtocolPNames.HTTP_ELEMENT_CHARSET);
this.charset = charset != null ? Charset.forName(charset) : Consts.ASCII;
this.ascii = this.charset.equals(Consts.ASCII);
this.decoder = null;
this.maxLineLen = params.getIntParameter(CoreConnectionPNames.MAX_LINE_LENGTH, -1);
this.minChunkLimit = params.getIntParameter(CoreConnectionPNames.MIN_CHUNK_LIMIT, 512);
this.metrics = createTransportMetrics();
final CodingErrorAction a1 = (CodingErrorAction) params.getParameter(
CoreProtocolPNames.HTTP_MALFORMED_INPUT_ACTION);
this.onMalformedCharAction = a1 != null ? a1 : CodingErrorAction.REPORT;
final CodingErrorAction a2 = (CodingErrorAction) params.getParameter(
CoreProtocolPNames.HTTP_UNMAPPABLE_INPUT_ACTION);
this.onUnmappableCharAction = a2 != null? a2 : CodingErrorAction.REPORT;
}
/**
* @since 4.1
*/
protected HttpTransportMetricsImpl createTransportMetrics() {
return new HttpTransportMetricsImpl();
}
/**
* @since 4.1
*/
public int capacity() {
return this.buffer.length;
}
/**
* @since 4.1
*/
public int length() {
return this.bufferlen - this.bufferpos;
}
/**
* @since 4.1
*/
public int available() {
return capacity() - length();
}
protected 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 = this.instream.read(this.buffer, off, len);
if (l == -1) {
return -1;
} else {
this.bufferlen = off + l;
this.metrics.incrementBytesTransferred(l);
return l;
}
}
protected boolean hasBufferedData() {
return this.bufferpos < this.bufferlen;
}
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 = this.instream.read(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 -1 is returned. This method blocks until input
* data is available, end of file is detected, or an exception is thrown.
*
* 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;
}
}
if (this.maxLineLen > 0 && this.linebuffer.length() >= this.maxLineLen) {
throw new IOException("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,
* null is returned. This method blocks until input data is
* available, end of file is detected, or an exception is thrown.
*
* 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.ascii) {
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 {
final int off = this.bufferpos;
int i = position;
this.bufferpos = i + 1;
if (i > off && this.buffer[i - 1] == HTTP.CR) {
// skip CR if found
i--;
}
int len = i - off;
if (this.ascii) {
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.decoder == null) {
this.decoder = this.charset.newDecoder();
this.decoder.onMalformedInput(this.onMalformedCharAction);
this.decoder.onUnmappableCharacter(this.onUnmappableCharAction);
}
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 HttpTransportMetrics getMetrics() {
return this.metrics;
}
}