mirror of
https://github.com/yacy/yacy_search_server.git
synced 2024-09-21 00:00:13 +02:00
7feae906aa
- removed potential null pointer accesses - removed unnecessary casts git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@4893 6c8d7289-2bf4-0310-a012-ef5d649a1542
515 lines
18 KiB
Java
515 lines
18 KiB
Java
// serverByteBuffer.java
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// ---------------------------
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2004
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// last major change: 11.03.2004
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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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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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package de.anomic.server;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.io.UnsupportedEncodingException;
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import java.util.Properties;
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public final class serverByteBuffer extends OutputStream {
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public static final byte singlequote = (byte) 39;
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public static final byte doublequote = (byte) 34;
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public static final byte equal = (byte) '=';
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private byte[] buffer;
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private int offset;
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private int length;
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public serverByteBuffer() {
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buffer = new byte[10];
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length = 0;
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offset = 0;
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}
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public serverByteBuffer(int initLength) {
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this.buffer = new byte[initLength];
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this.length = 0;
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this.offset = 0;
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}
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public serverByteBuffer(byte[] bb) {
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buffer = bb;
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length = bb.length;
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offset = 0;
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}
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public serverByteBuffer(byte[] bb, int initLength) {
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this.buffer = new byte[initLength];
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System.arraycopy(bb, 0, buffer, 0, bb.length);
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length = bb.length;
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offset = 0;
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}
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public serverByteBuffer(byte[] bb, int of, int le) {
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if (of * 2 > bb.length) {
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buffer = new byte[le];
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System.arraycopy(bb, of, buffer, 0, le);
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length = le;
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offset = 0;
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} else {
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buffer = bb;
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length = le;
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offset = of;
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}
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}
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public serverByteBuffer(serverByteBuffer bb) {
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buffer = bb.buffer;
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length = bb.length;
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offset = bb.offset;
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}
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public serverByteBuffer(File f) throws IOException {
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// initially fill the byte buffer with the content of a file
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if (f.length() > Integer.MAX_VALUE) throw new IOException("file is too large for buffering");
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length = (int) f.length();
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buffer = new byte[length];
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offset = 0;
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try {
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FileInputStream fis = new FileInputStream(f);
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// byte[] buf = new byte[512];
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// int p = 0;
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// while ((l = fis.read(buf)) > 0) {
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// System.arraycopy(buf, 0, buffer, p, l);
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// p += l;
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/*int l =*/ fis.read(buffer);
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// }
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fis.close();
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} catch (FileNotFoundException e) {
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throw new IOException("File not found: " + f.toString() + "; " + e.getMessage());
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}
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}
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public void clear() {
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// we keep the byte[] and just set the pointer to write positions to zero
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this.length = 0;
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this.offset = 0;
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}
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public int length() {
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return length;
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}
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private void grow() {
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int newsize = buffer.length * 2 + 1;
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if (newsize < 256) newsize = 256;
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byte[] tmp = new byte[newsize];
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System.arraycopy(buffer, offset, tmp, 0, length);
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buffer = tmp;
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tmp = null;
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offset = 0;
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}
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public void write(int b) {
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write((byte) (b & 0xff));
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}
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public void write(byte b) {
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if (offset + length + 1 > buffer.length) grow();
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buffer[offset + length++] = b;
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}
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public void write(byte[] bb) {
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write(bb, 0, bb.length);
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}
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public void write(byte[] bb, int of, int le) {
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while (offset + length + le > buffer.length) grow();
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System.arraycopy(bb, of, buffer, offset + length, le);
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length += le;
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}
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// overwrite does not increase the 'length' write position pointer!
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public void overwrite(int pos, int b) {
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overwrite(pos, (byte) (b & 0xff));
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}
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public void overwrite(int pos, byte b) {
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if (offset + pos + 1 > buffer.length) grow();
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buffer[offset + pos] = b;
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if (pos >= length) length = pos + 1;
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}
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public void overwrite(int pos, byte[] bb) {
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overwrite(pos, bb, 0, bb.length);
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}
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public void overwrite(int pos, byte[] bb, int of, int le) {
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while (offset + pos + le > buffer.length) grow();
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System.arraycopy(bb, of, buffer, offset + pos, le);
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if (pos + le > length) length = pos + le;
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}
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public serverByteBuffer append(byte b) {
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write(b);
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return this;
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}
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public serverByteBuffer append(int i) {
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write((byte) (i & 0xFF));
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return this;
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}
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public serverByteBuffer append(byte[] bb) {
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write(bb);
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return this;
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}
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public serverByteBuffer append(byte[] bb, int of, int le) {
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write(bb, of, le);
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return this;
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}
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public serverByteBuffer append(String s) {
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return append(s.getBytes());
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}
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public serverByteBuffer append(String s, String charset) throws UnsupportedEncodingException {
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return append(s.getBytes(charset));
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}
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public serverByteBuffer append(serverByteBuffer bb) {
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return append(bb.buffer, bb.offset, bb.length);
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}
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public serverByteBuffer append(Object o) {
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if (o instanceof String) return append((String) o);
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if (o instanceof byte[]) return append((byte[]) o);
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return null;
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}
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public byte byteAt(int pos) {
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if (pos > length) return -1;
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return buffer[offset + pos];
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}
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public void deleteByteAt(int pos) {
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if (pos < 0) return;
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if (pos >= length) return;
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if (pos == length - 1) {
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length--;
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} else {
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System.arraycopy(buffer, offset + pos + 1, buffer, offset + pos, length - pos - 1);
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}
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}
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public int indexOf(byte b) {
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return indexOf(b, 0);
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}
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public int indexOf(byte[] bs) {
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return indexOf(bs, 0);
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}
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public int indexOf(byte b, int start) {
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if (start >= length) return -1;
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for (int i = start; i < length; i++) if (buffer[offset + i] == b) return i;
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return -1;
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}
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public int indexOf(byte[] bs, int start) {
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if (start + bs.length > length) return -1;
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loop: for (int i = start; i <= length - bs.length; i++) {
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// first test only first byte
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if (buffer[offset + i] != bs[0]) continue loop;
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// then test all remaining bytes
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for (int j = 1; j < bs.length; j++) {
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if (buffer[offset + i + j] != bs[j]) continue loop;
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}
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// found hit
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return i;
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}
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return -1;
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}
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public int lastIndexOf(byte b) {
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for (int i = length - 1; i >= 0; i--) if (buffer[offset + i] == b) return i;
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return -1;
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}
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public boolean startsWith(byte[] bs) {
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return startsWith(bs, 0);
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}
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public boolean startsWith(byte[] bs, int start) {
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if (length - start < bs.length) return false;
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for (int i = 0; i < bs.length; i++) {
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if (buffer[offset + i + start] != bs[i]) return false;
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}
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return true;
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}
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public byte[] getBytes() {
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return getBytes(0);
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}
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public byte[] getBytes(int start) {
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return getBytes(start, this.length);
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}
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public byte[] getBytes(int start, int len) {
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// start is inclusive, end is exclusive
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if (len > length) throw new IndexOutOfBoundsException("getBytes: len > length");
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if (start > length) throw new IndexOutOfBoundsException("getBytes: start > length");
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if ((start == 0) && (len == length) && (len == buffer.length)) return buffer;
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byte[] tmp = new byte[len];
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System.arraycopy(buffer, offset + start, tmp, 0, len);
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return tmp;
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}
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public serverByteBuffer trim(int start) {
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trim(start, this.length - start);
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return this;
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}
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public serverByteBuffer trim(int start, int len) {
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if (start + len > this.length) throw new IndexOutOfBoundsException("trim: start + len > length; this.offset = " + this.offset + ", this.length = " + this.length + ", start = " + start + ", len = " + len);
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this.offset = this.offset + start;
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this.length = len;
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return this;
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}
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public serverByteBuffer trim() {
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int l = 0;
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while ((l < length) && (buffer[offset + l] <= 32)) {
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l++;
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}
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int r = length - 1;
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while ((r > l) && (buffer[offset + r] <= 32)) r--;
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return trim(l, r - l + 1);
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}
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public int isUTF8char(int start) {
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// a sequence of bytes is a utf-8 character, if one of the following 4 conditions is true:
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// - ASCII equivalence range; (first) byte begins with zero
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// - first byte begins with 110, the following byte begins with 10
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// - first byte begins with 1110, the following two bytes begin with 10
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// - First byte begins with 11110, the following three bytes begin with 10
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// if an utf-8 sequence is detected, the length of the sequence is returned. -1 othervise
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if ((start < length) &&
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((buffer[offset + start] & 0x80) != 0)) return 1;
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if ((start < length - 1) &&
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((buffer[offset + start ] & 0xE0) == 0xC0) &&
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((buffer[offset + start + 1] & 0xC0) == 0x80)) return 2;
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if ((start < length - 2) &&
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((buffer[offset + start ] & 0xF0) == 0xE0) &&
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((buffer[offset + start + 1] & 0xC0) == 0x80) &&
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((buffer[offset + start + 2] & 0xC0) == 0x80)) return 3;
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if ((start < length - 3) &&
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((buffer[offset + start ] & 0xF8) == 0xF0) &&
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((buffer[offset + start + 1] & 0xC0) == 0x80) &&
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((buffer[offset + start + 2] & 0xC0) == 0x80) &&
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((buffer[offset + start + 3] & 0xC0) == 0x80)) return 4;
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return -1;
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}
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public boolean isWhitespace(boolean includeNonLetterBytes) {
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// returns true, if trim() would result in an empty serverByteBuffer
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if (includeNonLetterBytes) {
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byte b;
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for (int i = 0; i < length; i++) {
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b = buffer[offset + i];
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if (((b >= '0') && (b <= '9')) || ((b >= 'A') && (b <= 'Z')) || ((b >= 'a') && (b <= 'z'))) return false;
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}
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} else {
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for (int i = 0; i < length; i++) if (buffer[offset + i] > 32) return false;
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}
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return true;
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}
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public int whitespaceStart(boolean includeNonLetterBytes) {
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// returns number of whitespace bytes at the beginning of text
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if (includeNonLetterBytes) {
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byte b;
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for (int i = 0; i < length; i++) {
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b = buffer[offset + i];
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if (((b >= '0') && (b <= '9')) || ((b >= 'A') && (b <= 'Z')) || ((b >= 'a') && (b <= 'z'))) return i;
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}
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} else {
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for (int i = 0; i < length; i++) if (buffer[offset + i] > 32) return i;
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}
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return length;
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}
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public int whitespaceEnd(boolean includeNonLetterBytes) {
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// returns position of whitespace at the end of text
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if (includeNonLetterBytes) {
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byte b;
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for (int i = length - 1; i >= 0; i--) {
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b = buffer[offset + i];
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if (((b >= '0') && (b <= '9')) || ((b >= 'A') && (b <= 'Z')) || ((b >= 'a') && (b <= 'z'))) return i + 1;
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}
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} else {
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for (int i = length - 1; i >= 0; i--) if (buffer[offset + i] > 32) return i + 1;
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}
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return 0;
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}
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public String toString() {
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return new String(buffer, offset, length);
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}
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public String toString(String charsetName) {
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try {
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return new String(this.getBytes(),charsetName);
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} catch (UnsupportedEncodingException e) {
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return new String(this.getBytes());
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}
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}
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public String toString(int left, int rightbound) {
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return new String(buffer, offset + left, rightbound - left);
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}
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public Properties propParser(String charset) {
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// extract a=b or a="b" - relations from the buffer
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int pos = offset;
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int start;
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String key;
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Properties p = new Properties();
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// eat up spaces at beginning
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while ((pos < length) && (buffer[pos] <= 32)) pos++;
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while (pos < length) {
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// pos is at start of next key
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start = pos;
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while ((pos < length) && (buffer[pos] != equal)) pos++;
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if (pos >= length) break; // this is the case if we found no equal
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try {
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key = new String(buffer, start, pos - start,charset).trim().toLowerCase();
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} catch (UnsupportedEncodingException e1) {
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key = new String(buffer, start, pos - start).trim().toLowerCase();
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}
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// we have a key
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pos++;
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// find start of value
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while ((pos < length) && (buffer[pos] <= 32)) pos++;
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// doublequotes are obligatory. However, we want to be fuzzy if they
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// are ommittet
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if (pos >= length) {
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// error case: input ended too early
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break;
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} else if (buffer[pos] == doublequote) {
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// search next doublequote
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pos++;
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start = pos;
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while ((pos < length) && (buffer[pos] != doublequote)) pos++;
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if (pos >= length) break; // this is the case if we found no parent doublequote
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try {
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p.setProperty(key, new String(buffer, start, pos - start,charset).trim());
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} catch (UnsupportedEncodingException e) {
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p.setProperty(key, new String(buffer, start, pos - start).trim());
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}
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pos++;
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} else if (buffer[pos] == singlequote) {
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// search next singlequote
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pos++;
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start = pos;
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while ((pos < length) && (buffer[pos] != singlequote)) pos++;
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if (pos >= length) break; // this is the case if we found no parent singlequote
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try {
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p.setProperty(key, new String(buffer, start, pos - start,charset).trim());
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} catch (UnsupportedEncodingException e) {
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p.setProperty(key, new String(buffer, start, pos - start).trim());
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}
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pos++;
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} else {
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// search next whitespace
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start = pos;
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while ((pos < length) && (buffer[pos] > 32)) pos++;
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try {
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p.setProperty(key, new String(buffer, start, pos - start,charset).trim());
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} catch (UnsupportedEncodingException e) {
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p.setProperty(key, new String(buffer, start, pos - start).trim());
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}
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}
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// pos should point now to a whitespace: eat up spaces
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while ((pos < length) && (buffer[pos] <= 32)) pos++;
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// go on with next loop
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}
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return p;
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}
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public static boolean equals(byte[] buffer, byte[] pattern) {
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return equals(buffer, 0, pattern);
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}
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public static boolean equals(byte[] buffer, int offset, byte[] pattern) {
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// compares two byte arrays: true, if pattern appears completely at offset position
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if (buffer.length < offset + pattern.length) return false;
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for (int i = 0; i < pattern.length; i++) if (buffer[offset + i] != pattern[i]) return false;
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return true;
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}
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public void reset() {
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this.length = 0;
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this.offset = 0;
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}
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public void reset(int newSize) {
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this.resize(newSize);
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this.reset();
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}
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public void resize(int newSize) {
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if(newSize < 0) throw new IllegalArgumentException("Illegal array size: " + newSize);
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byte[] v = new byte[newSize];
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System.arraycopy(this.buffer,0,v,0,newSize > this.buffer.length ? this.buffer.length : newSize);
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this.buffer = v;
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}
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public void writeTo(OutputStream dest) throws IOException {
|
|
dest.write(this.buffer, this.offset, this.length);
|
|
dest.flush();
|
|
}
|
|
|
|
} |