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Diffstat (limited to 'libjava/classpath/gnu/java/net/CRLFInputStream.java')
| -rw-r--r-- | libjava/classpath/gnu/java/net/CRLFInputStream.java | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/net/CRLFInputStream.java b/libjava/classpath/gnu/java/net/CRLFInputStream.java new file mode 100644 index 000000000..5e394ae2c --- /dev/null +++ b/libjava/classpath/gnu/java/net/CRLFInputStream.java @@ -0,0 +1,178 @@ +/* CRLFInputStream.java -- + Copyright (C) 2002, 2003, 2004, 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 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.BufferedInputStream; +import java.io.IOException; +import java.io.InputStream; + +/** + * An input stream that filters out CR/LF pairs into LFs. + * + * @author Chris Burdess (dog@gnu.org) + */ +public class CRLFInputStream + extends InputStream +{ + /** + * The CR octet. + */ + public static final int CR = 13; + + /** + * The LF octet. + */ + public static final int LF = 10; + + /** + * The underlying input stream. + */ + protected InputStream in; + + private boolean doReset; + + /** + * Constructs a CR/LF input stream connected to the specified input + * stream. + */ + public CRLFInputStream(InputStream in) + { + this.in = in.markSupported() ? in : new BufferedInputStream(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 = in.read(); + if (c == CR) + { + in.mark(1); + int d = in.read(); + if (d == LF) + { + c = d; + } + else + { + in.reset(); + } + } + 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 + { + in.mark(len + 1); + int l = in.read(b, off, len); + if (l > 0) + { + int i = indexOfCRLF(b, off, l); + if (doReset) + { + in.reset(); + if (i != -1) + { + l = in.read(b, off, (i + 1) - off); // read to CR + in.read(); // skip LF + b[i] = LF; // fix CR as LF + } + else + { + l = in.read(b, off, len); // CR(s) but no LF + } + } + } + return l; + } + + private int indexOfCRLF(byte[] b, int off, int len) + throws IOException + { + doReset = false; + int end = off + len; + int em1 = end - 1; + for (int i = off; i < end; i++) + { + if (b[i] == CR) + { + int d; + if (i == em1) + { + d = in.read(); + doReset = true; + } + else + { + d = b[i + 1]; + } + if (d == LF) + { + doReset = true; + return i; + } + } + } + return -1; + } + +} |