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361 lines
12 KiB
Java
361 lines
12 KiB
Java
/*
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* ====================================================================
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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*/
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package ch.boye.httpclientandroidlib.impl.io;
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import java.io.IOException;
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import java.io.InputStream;
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import ch.boye.httpclientandroidlib.io.BufferInfo;
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import ch.boye.httpclientandroidlib.io.SessionInputBuffer;
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import ch.boye.httpclientandroidlib.io.HttpTransportMetrics;
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import ch.boye.httpclientandroidlib.params.CoreConnectionPNames;
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import ch.boye.httpclientandroidlib.params.HttpParams;
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import ch.boye.httpclientandroidlib.params.HttpProtocolParams;
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import ch.boye.httpclientandroidlib.protocol.HTTP;
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import ch.boye.httpclientandroidlib.util.ByteArrayBuffer;
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import ch.boye.httpclientandroidlib.util.CharArrayBuffer;
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/**
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* Abstract base class for session input buffers that stream data from
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* an arbitrary {@link InputStream}. This class buffers input data in
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* an internal byte array for optimal input performance.
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* <p>
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* {@link #readLine(CharArrayBuffer)} and {@link #readLine()} methods of this
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* class treat a lone LF as valid line delimiters in addition to CR-LF required
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* by the HTTP specification.
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*
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* <p>
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* The following parameters can be used to customize the behavior of this
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* class:
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* <ul>
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* <li>{@link ch.boye.httpclientandroidlib.params.CoreProtocolPNames#HTTP_ELEMENT_CHARSET}</li>
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* <li>{@link ch.boye.httpclientandroidlib.params.CoreConnectionPNames#MAX_LINE_LENGTH}</li>
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* <li>{@link ch.boye.httpclientandroidlib.params.CoreConnectionPNames#MIN_CHUNK_LIMIT}</li>
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* </ul>
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* @since 4.0
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*/
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public abstract class AbstractSessionInputBuffer implements SessionInputBuffer, BufferInfo {
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private InputStream instream;
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private byte[] buffer;
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private int bufferpos;
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private int bufferlen;
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private ByteArrayBuffer linebuffer = null;
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private String charset = HTTP.US_ASCII;
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private boolean ascii = true;
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private int maxLineLen = -1;
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private int minChunkLimit = 512;
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private HttpTransportMetricsImpl metrics;
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/**
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* Initializes this session input buffer.
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*
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* @param instream the source input stream.
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* @param buffersize the size of the internal buffer.
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* @param params HTTP parameters.
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*/
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protected void init(final InputStream instream, int buffersize, final HttpParams params) {
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if (instream == null) {
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throw new IllegalArgumentException("Input stream may not be null");
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}
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if (buffersize <= 0) {
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throw new IllegalArgumentException("Buffer size may not be negative or zero");
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}
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if (params == null) {
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throw new IllegalArgumentException("HTTP parameters may not be null");
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}
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this.instream = instream;
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this.buffer = new byte[buffersize];
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this.bufferpos = 0;
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this.bufferlen = 0;
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this.linebuffer = new ByteArrayBuffer(buffersize);
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this.charset = HttpProtocolParams.getHttpElementCharset(params);
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this.ascii = this.charset.equalsIgnoreCase(HTTP.US_ASCII)
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|| this.charset.equalsIgnoreCase(HTTP.ASCII);
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this.maxLineLen = params.getIntParameter(CoreConnectionPNames.MAX_LINE_LENGTH, -1);
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this.minChunkLimit = params.getIntParameter(CoreConnectionPNames.MIN_CHUNK_LIMIT, 512);
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this.metrics = createTransportMetrics();
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}
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/**
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* @since 4.1
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*/
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protected HttpTransportMetricsImpl createTransportMetrics() {
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return new HttpTransportMetricsImpl();
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}
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/**
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* @since 4.1
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*/
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public int capacity() {
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return this.buffer.length;
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}
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/**
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* @since 4.1
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*/
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public int length() {
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return this.bufferlen - this.bufferpos;
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}
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/**
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* @since 4.1
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*/
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public int available() {
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return capacity() - length();
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}
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protected int fillBuffer() throws IOException {
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// compact the buffer if necessary
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if (this.bufferpos > 0) {
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int len = this.bufferlen - this.bufferpos;
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if (len > 0) {
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System.arraycopy(this.buffer, this.bufferpos, this.buffer, 0, len);
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}
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this.bufferpos = 0;
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this.bufferlen = len;
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}
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int l;
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int off = this.bufferlen;
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int len = this.buffer.length - off;
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l = this.instream.read(this.buffer, off, len);
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if (l == -1) {
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return -1;
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} else {
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this.bufferlen = off + l;
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this.metrics.incrementBytesTransferred(l);
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return l;
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}
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}
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protected boolean hasBufferedData() {
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return this.bufferpos < this.bufferlen;
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}
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public int read() throws IOException {
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int noRead = 0;
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while (!hasBufferedData()) {
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noRead = fillBuffer();
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if (noRead == -1) {
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return -1;
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}
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}
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return this.buffer[this.bufferpos++] & 0xff;
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}
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public int read(final byte[] b, int off, int len) throws IOException {
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if (b == null) {
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return 0;
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}
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if (hasBufferedData()) {
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int chunk = Math.min(len, this.bufferlen - this.bufferpos);
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System.arraycopy(this.buffer, this.bufferpos, b, off, chunk);
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this.bufferpos += chunk;
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return chunk;
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}
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// If the remaining capacity is big enough, read directly from the
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// underlying input stream bypassing the buffer.
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if (len > this.minChunkLimit) {
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int read = this.instream.read(b, off, len);
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if (read > 0) {
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this.metrics.incrementBytesTransferred(read);
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}
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return read;
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} else {
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// otherwise read to the buffer first
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while (!hasBufferedData()) {
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int noRead = fillBuffer();
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if (noRead == -1) {
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return -1;
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}
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}
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int chunk = Math.min(len, this.bufferlen - this.bufferpos);
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System.arraycopy(this.buffer, this.bufferpos, b, off, chunk);
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this.bufferpos += chunk;
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return chunk;
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}
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}
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public int read(final byte[] b) throws IOException {
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if (b == null) {
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return 0;
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}
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return read(b, 0, b.length);
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}
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private int locateLF() {
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for (int i = this.bufferpos; i < this.bufferlen; i++) {
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if (this.buffer[i] == HTTP.LF) {
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return i;
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}
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}
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return -1;
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}
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/**
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* Reads a complete line of characters up to a line delimiter from this
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* session buffer into the given line buffer. The number of chars actually
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* read is returned as an integer. The line delimiter itself is discarded.
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* If no char is available because the end of the stream has been reached,
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* the value <code>-1</code> is returned. This method blocks until input
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* data is available, end of file is detected, or an exception is thrown.
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* <p>
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* This method treats a lone LF as a valid line delimiters in addition
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* to CR-LF required by the HTTP specification.
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*
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* @param charbuffer the line buffer.
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* @return one line of characters
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* @exception IOException if an I/O error occurs.
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*/
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public int readLine(final CharArrayBuffer charbuffer) throws IOException {
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if (charbuffer == null) {
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throw new IllegalArgumentException("Char array buffer may not be null");
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}
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int noRead = 0;
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boolean retry = true;
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while (retry) {
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// attempt to find end of line (LF)
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int i = locateLF();
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if (i != -1) {
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// end of line found.
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if (this.linebuffer.isEmpty()) {
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// the entire line is preset in the read buffer
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return lineFromReadBuffer(charbuffer, i);
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}
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retry = false;
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int len = i + 1 - this.bufferpos;
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this.linebuffer.append(this.buffer, this.bufferpos, len);
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this.bufferpos = i + 1;
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} else {
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// end of line not found
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if (hasBufferedData()) {
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int len = this.bufferlen - this.bufferpos;
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this.linebuffer.append(this.buffer, this.bufferpos, len);
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this.bufferpos = this.bufferlen;
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}
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noRead = fillBuffer();
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if (noRead == -1) {
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retry = false;
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}
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}
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if (this.maxLineLen > 0 && this.linebuffer.length() >= this.maxLineLen) {
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throw new IOException("Maximum line length limit exceeded");
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}
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}
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if (noRead == -1 && this.linebuffer.isEmpty()) {
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// indicate the end of stream
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return -1;
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}
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return lineFromLineBuffer(charbuffer);
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}
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/**
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* Reads a complete line of characters up to a line delimiter from this
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* session buffer. The line delimiter itself is discarded. If no char is
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* available because the end of the stream has been reached,
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* <code>null</code> is returned. This method blocks until input data is
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* available, end of file is detected, or an exception is thrown.
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* <p>
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* This method treats a lone LF as a valid line delimiters in addition
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* to CR-LF required by the HTTP specification.
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*
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* @return HTTP line as a string
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* @exception IOException if an I/O error occurs.
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*/
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private int lineFromLineBuffer(final CharArrayBuffer charbuffer)
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throws IOException {
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// discard LF if found
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int l = this.linebuffer.length();
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if (l > 0) {
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if (this.linebuffer.byteAt(l - 1) == HTTP.LF) {
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l--;
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this.linebuffer.setLength(l);
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}
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// discard CR if found
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if (l > 0) {
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if (this.linebuffer.byteAt(l - 1) == HTTP.CR) {
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l--;
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this.linebuffer.setLength(l);
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}
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}
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}
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l = this.linebuffer.length();
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if (this.ascii) {
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charbuffer.append(this.linebuffer, 0, l);
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} else {
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// This is VERY memory inefficient, BUT since non-ASCII charsets are
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// NOT meant to be used anyway, there's no point optimizing it
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String s = new String(this.linebuffer.buffer(), 0, l, this.charset);
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l = s.length();
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charbuffer.append(s);
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}
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this.linebuffer.clear();
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return l;
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}
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private int lineFromReadBuffer(final CharArrayBuffer charbuffer, int pos)
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throws IOException {
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int off = this.bufferpos;
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int len;
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this.bufferpos = pos + 1;
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if (pos > 0 && this.buffer[pos - 1] == HTTP.CR) {
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// skip CR if found
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pos--;
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}
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len = pos - off;
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if (this.ascii) {
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charbuffer.append(this.buffer, off, len);
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} else {
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// This is VERY memory inefficient, BUT since non-ASCII charsets are
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// NOT meant to be used anyway, there's no point optimizing it
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String s = new String(this.buffer, off, len, this.charset);
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charbuffer.append(s);
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len = s.length();
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}
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return len;
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}
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public String readLine() throws IOException {
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CharArrayBuffer charbuffer = new CharArrayBuffer(64);
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int l = readLine(charbuffer);
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if (l != -1) {
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return charbuffer.toString();
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} else {
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return null;
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}
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}
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public HttpTransportMetrics getMetrics() {
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return this.metrics;
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}
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}
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