1 /* ChunkedInputStream.java --
2 Copyright (C) 2004, 2006 Free Software Foundation, Inc.
4 This file is part of GNU Classpath.
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING. If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
39 package gnu.java.net.protocol.http;
41 import java.io.IOException;
42 import java.io.InputStream;
43 import java.net.ProtocolException;
47 // Note that we rely on the implemtation of skip() in the super class
48 // (InputStream) calling our read methods to account for chunk headers
54 * Input stream wrapper for the "chunked" transfer-coding.
56 * @author Chris Burdess (dog@gnu.org)
58 public class ChunkedInputStream
63 /** The underlying stream. */
64 private InputStream in;
66 /** Size of the chunk we're reading. */
68 /** Number of bytes we've read in this chunk. */
71 * True when we should read meta-information, false when we should
75 /** True when we've hit EOF. */
80 * @param in the response socket input stream
81 * @param headers the headers to receive additional header lines
83 public ChunkedInputStream(InputStream in, Headers headers)
86 this.headers = headers;
95 byte[] buf = new byte[1];
96 int len = read(buf, 0, 1);
101 return 0xff & buf[0];
104 public synchronized int read(byte[] buffer, int offset, int length)
115 boolean seenSemi = false;
116 StringBuilder buf = new StringBuilder();
124 else if (c == 0x0a && last == 0x0d) // CRLF
128 size = Integer.parseInt(buf.toString(), 16);
130 catch (NumberFormatException nfe)
132 IOException ioe = new IOException("Bad chunk header");
134 // Unrecoverable. Don't try to read more.
140 else if (!seenSemi && c >= 0x30)
142 buf.append ((char) c);
159 int canRead = Math.min(size - count, length);
160 int len = in.read(buffer, offset, canRead);
163 // This is an error condition but it isn't clear what we
164 // should do with it.
174 if (c1 == -1 || c2 == -1)
176 // EOF before CRLF: bad, but ignore
180 if (c1 != 0x0d || c2 != 0x0a)
182 throw new ProtocolException("expecting CRLF: " + c1 + "," + c2);
191 * This method returns the number of bytes that can be read from
192 * this stream before a read might block. Even if the underlying
193 * InputStream has data available past the end of the current chunk,
194 * we have no way of knowing how large the next chunk header will
195 * be. So we cannot report available data past the current chunk.
197 * @return The number of bytes that can be read before a read might
200 * @exception IOException If an error occurs
202 public int available() throws IOException
207 return Math.min(in.available(), size - count);
211 * This method closes the ChunkedInputStream by closing the underlying
214 * @exception IOException If an error occurs
216 public void close() throws IOException