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Diffstat (limited to 'libjava/gnu/java/net/CRLFInputStream.java')
| -rw-r--r-- | libjava/gnu/java/net/CRLFInputStream.java | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/libjava/gnu/java/net/CRLFInputStream.java b/libjava/gnu/java/net/CRLFInputStream.java new file mode 100644 index 00000000000..706c23447be --- /dev/null +++ b/libjava/gnu/java/net/CRLFInputStream.java @@ -0,0 +1,205 @@ +/* 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; + } +} |