| /* CRLFInputStream.java -- |
| Copyright (C) 2002, 2003, 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; |
| |
| import java.io.FilterInputStream; |
| import java.io.InputStream; |
| import java.io.IOException; |
| |
| /** |
| * An input stream that filters out CR/LF pairs into LFs. |
| * |
| * @author Chris Burdess (dog@gnu.org) |
| */ |
| public class CRLFInputStream |
| extends FilterInputStream |
| { |
| /** |
| * The CR octet. |
| */ |
| public static final int CR = 13; |
| |
| /** |
| * The LF octet. |
| */ |
| public static final int LF = 10; |
| |
| /** |
| * Buffer. |
| */ |
| protected int buf = -1; |
| |
| /** |
| * Buffer at time of mark. |
| */ |
| protected int markBuf = -1; |
| |
| /** |
| * Constructs a CR/LF input stream connected to the specified input |
| * stream. |
| */ |
| public CRLFInputStream(InputStream in) |
| { |
| super(in); |
| } |
| |
| /** |
| * Reads the next byte of data from this input stream. |
| * Returns -1 if the end of the stream has been reached. |
| * @exception IOException if an I/O error occurs |
| */ |
| public int read() |
| throws IOException |
| { |
| int c; |
| if (buf != -1) |
| { |
| c = buf; |
| buf = -1; |
| return c; |
| } |
| else |
| { |
| c = super.read(); |
| if (c == CR) |
| { |
| buf = super.read(); |
| if (buf == LF) |
| { |
| c = buf; |
| buf = -1; |
| } |
| } |
| } |
| return c; |
| } |
| |
| /** |
| * Reads up to b.length bytes of data from this input stream into |
| * an array of bytes. |
| * Returns -1 if the end of the stream has been reached. |
| * @exception IOException if an I/O error occurs |
| */ |
| public int read(byte[] b) |
| throws IOException |
| { |
| return read(b, 0, b.length); |
| } |
| |
| /** |
| * Reads up to len bytes of data from this input stream into an |
| * array of bytes, starting at the specified offset. |
| * Returns -1 if the end of the stream has been reached. |
| * @exception IOException if an I/O error occurs |
| */ |
| public int read(byte[] b, int off, int len) |
| throws IOException |
| { |
| int shift = 0; |
| if (buf != -1) |
| { |
| // Push buf onto start of byte array |
| b[off] = (byte) buf; |
| off++; |
| len--; |
| buf = -1; |
| shift++; |
| } |
| int l = super.read(b, off, len); |
| l = removeCRLF(b, off - shift, l); |
| return l; |
| } |
| |
| /** |
| * Indicates whether this stream supports the mark and reset methods. |
| */ |
| public boolean markSupported() |
| { |
| return in.markSupported(); |
| } |
| |
| /** |
| * Marks the current position in this stream. |
| */ |
| public void mark(int readlimit) |
| { |
| in.mark(readlimit); |
| markBuf = buf; |
| } |
| |
| /** |
| * Repositions this stream to the position at the time the mark method was |
| * called. |
| */ |
| public void reset() |
| throws IOException |
| { |
| in.reset(); |
| buf = markBuf; |
| } |
| |
| private int removeCRLF(byte[] b, int off, int len) |
| { |
| int end = off + len; |
| for (int i = off; i < end; i++) |
| { |
| if (b[i] == CR) |
| { |
| if (i + 1 == end) |
| { |
| // This is the last byte, impossible to determine whether CRLF |
| buf = CR; |
| len--; |
| } |
| else if (b[i + 1] == LF) |
| { |
| // Shift left |
| end--; |
| for (int j = i; j < end; j++) |
| { |
| b[j] = b[j + 1]; |
| } |
| len--; |
| end = off + len; |
| } |
| } |
| } |
| return len; |
| } |
| } |