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+/* aligningInputStream.java --
+ Copyright (C) 2005 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.CORBA.CDR;
+
+import java.io.ByteArrayInputStream;
+
+import org.omg.CORBA.BAD_PARAM;
+
+/**
+ * The input stream with the possibility to align on the
+ * word (arbitrary size) boundary.
+ *
+ * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
+ */
+public class aligningInputStream
+ extends ByteArrayInputStream
+{
+ /**
+ * The alignment offset.
+ */
+ private int offset = 0;
+
+ /**
+ * Create a stream, reading form the given buffer.
+ *
+ * @param a_buffer a buffer to read from.
+ */
+ public aligningInputStream(byte[] a_buffer)
+ {
+ super(a_buffer);
+ }
+
+ /**
+ * Create a stream, reading from the given buffer region.
+ *
+ * @param a_buffer a buffer to read from.
+ * @param offset the offset of the region.
+ * @param length thr length of the region.
+ */
+ public aligningInputStream(byte[] a_buffer, int offset, int length)
+ {
+ super(a_buffer, offset, length);
+ }
+
+ /**
+ * Set the alignment offset, if the index of the first byte in the
+ * stream is different from 0.
+ */
+ public void setOffset(int an_offset)
+ {
+ offset = an_offset;
+ }
+
+ /**
+ * Skip several bytes, aligning the internal pointer on the
+ * selected boundary.
+ *
+ * @throws BAD_PARAM, minor code 0, the alignment is not possible,
+ * usually due the wrong parameter value.
+ */
+ public void align(int alignment)
+ {
+ try
+ {
+ int d = (pos + offset) % alignment;
+ if (d > 0)
+ {
+ skip(alignment - d);
+ }
+ }
+ catch (Exception ex)
+ {
+ BAD_PARAM p = new BAD_PARAM("Unable to align at " + alignment);
+ p.initCause(ex);
+ throw p;
+ }
+ }
+
+ /**
+ * Get the byte buffer, from where the data are read.
+ */
+ public byte[] getBuffer()
+ {
+ return buf;
+ }
+}