| /* ChunkedInputStream.java -- |
| Copyright (C) 2004 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath 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, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.java.net.protocol.http; |
| |
| import java.io.FilterInputStream; |
| import java.io.InputStream; |
| import java.io.IOException; |
| import java.net.ProtocolException; |
| |
| /** |
| * Input stream wrapper for the "chunked" transfer-coding. |
| * |
| * @author Chris Burdess (dog@gnu.org) |
| */ |
| public class ChunkedInputStream |
| extends FilterInputStream |
| { |
| |
| private static final byte CR = 0x0d; |
| private static final byte LF = 0x0a; |
| |
| int size; |
| int count; |
| boolean meta; |
| boolean eof; |
| Headers headers; |
| |
| /** |
| * Constructor. |
| * @param in the response socket input stream |
| * @param headers the headers to receive additional header lines |
| */ |
| public ChunkedInputStream(InputStream in, Headers headers) |
| { |
| super(in); |
| this.headers = headers; |
| size = -1; |
| count = 0; |
| meta = true; |
| } |
| |
| public int read() |
| throws IOException |
| { |
| byte[] buf = new byte[1]; |
| int len = read(buf, 0, 1); |
| if (len == -1) |
| { |
| return -1; |
| } |
| int ret = (int) buf[0]; |
| if (ret < 0) |
| { |
| ret += 0x100; |
| } |
| return ret; |
| } |
| |
| public int read(byte[] buffer) |
| throws IOException |
| { |
| return read(buffer, 0, buffer.length); |
| } |
| |
| public int read(byte[] buffer, int offset, int length) |
| throws IOException |
| { |
| if (eof) |
| { |
| return -1; |
| } |
| if (meta) |
| { |
| // Read chunk header |
| int c, last = 0; |
| boolean seenSemi = false; |
| StringBuffer buf = new StringBuffer(); |
| do |
| { |
| c = in.read(); |
| if (c == 0x3b) // ; |
| { |
| seenSemi = true; |
| } |
| else if (c == 0x0a && last == 0x0d) // CRLF |
| { |
| size = Integer.parseInt(buf.toString(), 16); |
| break; |
| } |
| else if (!seenSemi && c >= 0x30) |
| { |
| buf.append ((char) c); |
| } |
| last = c; |
| } |
| while(c != -1); |
| count = 0; |
| meta = false; |
| } |
| if (size == 0) |
| { |
| // Read trailer |
| headers.parse(in); |
| eof = true; |
| return -1; |
| } |
| else |
| { |
| int diff = length - offset; |
| int max = size - count; |
| max = (diff < max) ? diff : max; |
| int len = (max > 0) ? in.read(buffer, offset, max) : 0; |
| count += len; |
| if (count == size) |
| { |
| // Read CRLF |
| int c1 = in.read(); |
| int c2 = in.read(); |
| if (c1 == -1 && c2 == -1) |
| { |
| // EOF before CRLF: bad, but ignore |
| eof = true; |
| return -1; |
| } |
| if (c1 != 0x0d || c2 != 0x0a) |
| { |
| throw new ProtocolException("expecting CRLF: " + c1 + "," + c2); |
| } |
| meta = true; |
| } |
| return len; |
| } |
| } |
| |
| } |
| |