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80 lines
2.9 KiB
80 lines
2.9 KiB
// AbstractRandomAccessWriter.java
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// -------------------------------
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// (C) 2009 by Michael Peter Christen; mc@yacy.net
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 09.09.2009
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//
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// $LastChangedDate: 2009-01-30 15:48:11 +0100 (Fr, 30 Jan 2009) $
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// $LastChangedRevision: 5539 $
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// $LastChangedBy: orbiter $
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package net.yacy.kelondro.io;
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import java.io.File;
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import java.io.IOException;
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public abstract class AbstractReader implements Reader {
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// logging support
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protected String name = null;
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protected File file = null;
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public String name() {
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return name;
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}
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public File file() {
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return file;
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}
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// pseudo-native methods:
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abstract public void readFully(byte[] b, int off, int len) throws IOException;
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abstract public long length() throws IOException;
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abstract public long available() throws IOException;
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abstract public void seek(long pos) throws IOException;
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abstract public void close() throws IOException;
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// derived methods:
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public final byte[] readFully() throws IOException {
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long a = this.available();
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if (a <= 0) return null;
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if (a > Integer.MAX_VALUE) throw new IOException("available too large for a single array");
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final byte[] buffer = new byte[(int) a];
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this.readFully(buffer, 0, (int) a);
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return buffer;
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}
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public final short readShort() throws IOException {
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byte[] b = new byte[2];
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this.readFully(b, 0, 2);
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//if ((b[0] | b[1]) < 0) throw new IOException("kelondroAbstractRA.readInt: wrong values; ch1=" + (b[0] & 0xFF) + ", ch2=" + (b[1] & 0xFF));
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return (short) (((b[0] & 0xFF) << 8) | (b[1] & 0xFF));
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}
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public final int readInt() throws IOException {
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byte[] b = new byte[4];
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this.readFully(b, 0, 4);
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//if ((b[0] | b[1] | b[2] | b[3]) < 0) throw new IOException("kelondroAbstractRA.readInt: wrong values; ch1=" + (b[0] & 0xFF) + ", ch2=" + (b[1] & 0xFF) + ", ch3=" + (b[2] & 0xFF) + ", ch4=" + (b[3] & 0xFF));
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return (((b[0] & 0xFF) << 24) | ((b[1] & 0xFF) << 16) | ((b[2] & 0xFF) << 8) | (b[3] & 0xFF));
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}
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public final long readLong() throws IOException {
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return ((long) (readInt()) << 32) | (readInt() & 0xFFFFFFFFL);
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}
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}
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