//httpChunkedInputStream.java
//-----------------------
//(C) by Michael Peter Christen; mc@yacy.net
//first published on http://www.anomic.de
//Frankfurt, Germany, 2004
//
// This file is contributed by Martin Thelian
// last major change: $LastChangedDate$ by $LastChangedBy$
// Revision: $LastChangedRevision$
//
//This program is free software; you can redistribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation; either version 2 of the License, or
//(at your option) any later version.
//
//This program is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
//GNU General Public License for more details.
//
//You should have received a copy of the GNU General Public License
//along with this program; if not, write to the Free Software
//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package de.anomic.http;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import de.anomic.kelondro.util.ByteBuffer;
/**
* 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>
* @author theli
*/
public final class httpChunkedInputStream extends InputStream {
private static final int READ_CHUNK_STATE_NORMAL = 0;
private static final int READ_CHUNK_STATE_CR_READ = 1;
private static final int READ_CHUNK_STATE_IN_EXT_CHUNK = 2;
private static final int READ_CHUNK_STATE_FINISHED = -1;
private static final char CR = '\r';
private static final char LF = '\n';
private final InputStream inputStream;
private int currPos;
private int currChunkSize;
private httpRequestHeader httpTrailer;
private boolean beginningOfStream = true;
private boolean isEOF = false;
private boolean isClosed = false;
public httpChunkedInputStream(final InputStream in) {
if (in == null)throw new IllegalArgumentException("InputStream must not be null");
this.inputStream = in;
this.currPos = 0;
}
public int read() throws IOException {
if (this.isClosed) throw new IOException("Inputstream already closed.");
if (this.isEOF) return -1;
if (this.currPos >= this.currChunkSize) {
readNextChunk();
if (this.isEOF) return -1;
}
this.currPos++;
return this.inputStream.read();
}
public int read (final byte[] b, final int off, int len) throws IOException {
if (this.isClosed) throw new IOException("Inputstream already closed.");
if (this.isEOF) return -1;
if (this.currPos >= this.currChunkSize) {
readNextChunk();
if (this.isEOF) return -1;
}
len = Math.min(len, this.currChunkSize - this.currPos);
final int count = this.inputStream.read(b, off, len);
this.currPos += count;
return count;
}
public int read (final byte[] b) throws IOException {
return read(b, 0, b.length);
}
/**
* Read the CRLF terminator.
* @throws IOException If an IO error occurs.
*/
private void readCRLF() throws IOException {
final int cr = this.inputStream.read();
final int lf = this.inputStream.read();
if ((cr != CR) || (lf != LF)) {
throw new IOException("Malformed chunk. CRLF expected but '" + cr + lf + "' found");
}
}
private void readNextChunk() throws IOException {
if (!this.beginningOfStream) readCRLF();
this.currChunkSize = readChunkFromStream(this.inputStream);
this.beginningOfStream = false;
this.currPos = 0;
if (this.currChunkSize == 0) {
this.isEOF = true;
readTrailer();
}
}
private void readTrailer() throws IOException {
BufferedReader reader = null;
ByteBuffer bout = null;
try {
bout = new ByteBuffer();
do {
int ch;
while ((ch = this.inputStream.read()) >= 0) {
bout.write(ch);
if (ch == LF) {
break;
}
}
if (bout.length() <= 2) break;
} while(true);
final ByteArrayInputStream bin = new ByteArrayInputStream(bout.getBytes());
reader = new BufferedReader(new InputStreamReader(bin));
this.httpTrailer = new httpRequestHeader();
this.httpTrailer.readHttpHeader(reader);
} finally {
if (reader != null) try {reader.close();}catch(final Exception e){}
if (bout != null) try {bout.close();}catch(final Exception e){}
}
}
private static int readChunkFromStream(final InputStream in) throws IOException {
final ByteBuffer baos = new ByteBuffer();
int state = READ_CHUNK_STATE_NORMAL;
while (state != READ_CHUNK_STATE_FINISHED) {
final int b = in.read();
if (b == -1) throw new IOException("Malformed chunk. Unexpected end");
switch (state) {
case READ_CHUNK_STATE_NORMAL: // 0
switch (b) {
case CR:
state = READ_CHUNK_STATE_CR_READ;
break;
case '\"':
case ';':
case ' ':
state = READ_CHUNK_STATE_IN_EXT_CHUNK;
break;
default:
baos.write(b);
}
break;
case READ_CHUNK_STATE_CR_READ: // 1
if (b == LF) {
state = READ_CHUNK_STATE_FINISHED;
} else {
// this was not CRLF
throw new IOException("Malformed chunk. Unexpected enf of chunk. MIssing CR character.");
}
break;
case READ_CHUNK_STATE_IN_EXT_CHUNK: // 2
switch (b) {
case CR:
state = READ_CHUNK_STATE_CR_READ;
break;
default:
break;
}
break;
default: throw new RuntimeException("Malformed chunk. Illegal state.");
}
}
int result;
try {
result = Integer.parseInt(baos.toString().trim(), 16);
} catch (final NumberFormatException e) {
throw new IOException ("Malformed chunk. Bad chunk size: " + baos.toString());
} finally {
baos.close();
}
return result;
}
public void close() throws IOException {
if (!this.isClosed) {
try {
if (!this.isEOF) {
exhaustInputStream(this);
}
} finally {
this.isEOF = true;
this.isClosed = true;
}
}
}
static void exhaustInputStream(final InputStream inStream) throws IOException {
final byte buffer[] = new byte[1024];
while (inStream.read(buffer) >= 0) {
}
}
}