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253 lines
8.9 KiB
253 lines
8.9 KiB
//httpChunkedInputStream.java
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//-----------------------
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//(C) by Michael Peter Christen; mc@anomic.de
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//first published on http://www.anomic.de
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//Frankfurt, Germany, 2004
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//
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// This file is contributed by Martin Thelian
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// last major change: $LastChangedDate$ by $LastChangedBy$
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// Revision: $LastChangedRevision$
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//
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//This program is free software; you can redistribute it and/or modify
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//it under the terms of the GNU General Public License as published by
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//the Free Software Foundation; either version 2 of the License, or
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//(at your option) any later version.
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//
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//This program is distributed in the hope that it will be useful,
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//but WITHOUT ANY WARRANTY; without even the implied warranty of
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//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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//GNU General Public License for more details.
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//
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//You should have received a copy of the GNU General Public License
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//along with this program; if not, write to the Free Software
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//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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//Using this software in any meaning (reading, learning, copying, compiling,
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//running) means that you agree that the Author(s) is (are) not responsible
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//for cost, loss of data or any harm that may be caused directly or indirectly
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//by usage of this softare or this documentation. The usage of this software
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//is on your own risk. The installation and usage (starting/running) of this
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//software may allow other people or application to access your computer and
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//any attached devices and is highly dependent on the configuration of the
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//software which must be done by the user of the software; the author(s) is
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//(are) also not responsible for proper configuration and usage of the
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//software, even if provoked by documentation provided together with
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//the software.
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//
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//Any changes to this file according to the GPL as documented in the file
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//gpl.txt aside this file in the shipment you received can be done to the
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//lines that follows this copyright notice here, but changes must not be
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//done inside the copyright notive above. A re-distribution must contain
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//the intact and unchanged copyright notice.
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//Contributions and changes to the program code must be marked as such.
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package de.anomic.http;
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import java.io.BufferedReader;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import de.anomic.server.serverByteBuffer;
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/**
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* Some parts of this class code was copied from <a href="http://www.devdaily.com/java/jwarehouse/commons-httpclient-2.0/src/java/org/apache/commons/httpclient/ChunkedInputStream.shtml">Apache httpclient Project.</a>
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* @author theli
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*/
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public final class httpChunkedInputStream extends InputStream {
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private static final int READ_CHUNK_STATE_NORMAL = 0;
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private static final int READ_CHUNK_STATE_CR_READ = 1;
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private static final int READ_CHUNK_STATE_IN_EXT_CHUNK = 2;
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private static final int READ_CHUNK_STATE_FINISHED = -1;
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private static final char CR = '\r';
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private static final char LF = '\n';
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private final InputStream inputStream;
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private int currPos;
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private int currChunkSize;
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private httpHeader httpTrailer;
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private boolean beginningOfStream = true;
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private boolean isEOF = false;
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private boolean isClosed = false;
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public httpChunkedInputStream(InputStream in) {
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if (in == null)throw new IllegalArgumentException("InputStream must not be null");
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this.inputStream = in;
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this.currPos = 0;
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}
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public int read() throws IOException {
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if (this.isClosed) throw new IOException("Inputstream already closed.");
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if (this.isEOF) return -1;
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if (this.currPos >= this.currChunkSize) {
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readNextChunk();
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if (this.isEOF) return -1;
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}
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this.currPos++;
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return this.inputStream.read();
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}
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public int read (byte[] b, int off, int len) throws IOException {
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if (this.isClosed) throw new IOException("Inputstream already closed.");
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if (this.isEOF) return -1;
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if (this.currPos >= this.currChunkSize) {
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readNextChunk();
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if (this.isEOF) return -1;
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}
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len = Math.min(len, this.currChunkSize - this.currPos);
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int count = this.inputStream.read(b, off, len);
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this.currPos += count;
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return count;
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}
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public int read (byte[] b) throws IOException {
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return read(b, 0, b.length);
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}
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/**
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* Read the CRLF terminator.
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* @throws IOException If an IO error occurs.
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*/
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private void readCRLF() throws IOException {
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int cr = this.inputStream.read();
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int lf = this.inputStream.read();
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if ((cr != CR) || (lf != LF)) {
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throw new IOException("Malformed chunk. CRLF expected but '" + cr + lf + "' found");
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}
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}
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private void readNextChunk() throws IOException {
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if (!this.beginningOfStream) readCRLF();
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this.currChunkSize = readChunkFromStream(this.inputStream);
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this.beginningOfStream = false;
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this.currPos = 0;
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if (this.currChunkSize == 0) {
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this.isEOF = true;
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readTrailer();
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}
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}
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private void readTrailer() throws IOException {
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BufferedReader reader = null;
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serverByteBuffer bout = null;
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try {
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bout = new serverByteBuffer();
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do {
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int ch;
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while ((ch = this.inputStream.read()) >= 0) {
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bout.write(ch);
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if (ch == LF) {
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break;
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}
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}
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if (bout.length() <= 2) break;
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} while(true);
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ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
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reader = new BufferedReader(new InputStreamReader(bin));
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this.httpTrailer = httpHeader.readHttpHeader(reader);
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} finally {
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if (reader != null) try {reader.close();}catch(Exception e){}
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if (bout != null) try {bout.close();}catch(Exception e){}
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}
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}
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public httpHeader getTrailer() {
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return this.httpTrailer;
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}
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private static int readChunkFromStream(final InputStream in)
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throws IOException {
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serverByteBuffer baos = new serverByteBuffer();
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int state = READ_CHUNK_STATE_NORMAL;
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while (state != READ_CHUNK_STATE_FINISHED) {
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int b = in.read();
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if (b == -1) throw new IOException("Malformed chunk. Unexpected end");
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switch (state) {
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case READ_CHUNK_STATE_NORMAL: // 0
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switch (b) {
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case CR:
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state = READ_CHUNK_STATE_CR_READ;
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break;
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case '\"':
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case ';':
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case ' ':
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state = READ_CHUNK_STATE_IN_EXT_CHUNK;
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break;
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default:
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baos.write(b);
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}
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break;
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case READ_CHUNK_STATE_CR_READ: // 1
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if (b == LF) {
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state = READ_CHUNK_STATE_FINISHED;
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} else {
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// this was not CRLF
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throw new IOException("Malformed chunk. Unexpected enf of chunk. MIssing CR character.");
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}
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break;
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case READ_CHUNK_STATE_IN_EXT_CHUNK: // 2
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switch (b) {
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case CR:
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state = READ_CHUNK_STATE_CR_READ;
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break;
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default:
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break;
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}
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break;
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default: throw new RuntimeException("Malformed chunk. Illegal state.");
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}
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}
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int result;
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try {
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result = Integer.parseInt(baos.toString().trim(), 16);
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} catch (NumberFormatException e) {
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throw new IOException ("Malformed chunk. Bad chunk size: " + baos.toString());
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}
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return result;
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}
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public void close() throws IOException {
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if (!this.isClosed) {
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try {
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if (!this.isEOF) {
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exhaustInputStream(this);
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}
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} finally {
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this.isEOF = true;
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this.isClosed = true;
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}
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}
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}
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static void exhaustInputStream(InputStream inStream) throws IOException {
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byte buffer[] = new byte[1024];
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while (inStream.read(buffer) >= 0) {
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;
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}
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}
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}
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