mirror of
https://github.com/yacy/yacy_search_server.git
synced 2024-09-21 00:00:13 +02:00
dc26d6262b
- added new data structure 'eco' for an index file that should use only 50% of write-IO compared to kelondroFlex The new eco index is not used yet, but already successfully tested with the collectionIndex The main purpose is to replace the kelondroFlex at every point when enough RAM is available. Othervise, the kelondroFlex stays as option in case of low memory (which then can even use a file-index) git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@4337 6c8d7289-2bf4-0310-a012-ef5d649a1542
402 lines
17 KiB
Java
402 lines
17 KiB
Java
// kelondroBase64Order.java
|
|
// -----------------------
|
|
// part of The Kelondro Database
|
|
// (C) by Michael Peter Christen; mc@anomic.de
|
|
// first published on http://www.anomic.de
|
|
// Frankfurt, Germany, 2005
|
|
// created 03.01.2006
|
|
//
|
|
// $LastChangedDate$
|
|
// $LastChangedRevision$
|
|
// $LastChangedBy$
|
|
//
|
|
// This program 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 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program 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 this program; if not, write to the Free Software
|
|
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
//
|
|
// Using this software in any meaning (reading, learning, copying, compiling,
|
|
// running) means that you agree that the Author(s) is (are) not responsible
|
|
// for cost, loss of data or any harm that may be caused directly or indirectly
|
|
// by usage of this softare or this documentation. The usage of this software
|
|
// is on your own risk. The installation and usage (starting/running) of this
|
|
// software may allow other people or application to access your computer and
|
|
// any attached devices and is highly dependent on the configuration of the
|
|
// software which must be done by the user of the software; the author(s) is
|
|
// (are) also not responsible for proper configuration and usage of the
|
|
// software, even if provoked by documentation provided together with
|
|
// the software.
|
|
//
|
|
// Any changes to this file according to the GPL as documented in the file
|
|
// gpl.txt aside this file in the shipment you received can be done to the
|
|
// lines that follows this copyright notice here, but changes must not be
|
|
// done inside the copyright notive above. A re-distribution must contain
|
|
// the intact and unchanged copyright notice.
|
|
// Contributions and changes to the program code must be marked as such.
|
|
|
|
|
|
package de.anomic.kelondro;
|
|
|
|
import java.io.UnsupportedEncodingException;
|
|
import java.util.Comparator;
|
|
|
|
import de.anomic.server.logging.serverLog;
|
|
|
|
public class kelondroBase64Order extends kelondroAbstractOrder<byte[]> implements kelondroByteOrder, kelondroCoding, Comparator<byte[]> {
|
|
|
|
protected static final char[] alpha_standard = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
|
|
protected static final char[] alpha_enhanced = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_".toCharArray();
|
|
protected static final byte[] ahpla_standard = new byte[128];
|
|
protected static final byte[] ahpla_enhanced = new byte[128];
|
|
|
|
static {
|
|
for (int i = 0; i < 128; i++) {
|
|
ahpla_standard[i] = -1;
|
|
ahpla_enhanced[i] = -1;
|
|
}
|
|
for (int i = 0; i < alpha_standard.length; i++) {
|
|
ahpla_standard[alpha_standard[i]] = (byte) i;
|
|
ahpla_enhanced[alpha_enhanced[i]] = (byte) i;
|
|
}
|
|
}
|
|
|
|
private final serverLog log;
|
|
|
|
public static final kelondroBase64Order standardCoder = new kelondroBase64Order(true, true);
|
|
public static final kelondroBase64Order enhancedCoder = new kelondroBase64Order(true, false);
|
|
public static final Comparator<String> standardComparator = new kelondroByteOrder.StringOrder(standardCoder);
|
|
public static final Comparator<String> enhancedComparator = new kelondroByteOrder.StringOrder(enhancedCoder);
|
|
|
|
private boolean rfc1113compliant;
|
|
private final char[] alpha;
|
|
private final byte[] ahpla;
|
|
|
|
public kelondroBase64Order(boolean up, boolean rfc1113compliant) {
|
|
// if we choose not to be rfc1113compliant,
|
|
// then we get shorter base64 results which are also filename-compatible
|
|
this.rfc1113compliant = rfc1113compliant;
|
|
this.asc = up;
|
|
alpha = (rfc1113compliant) ? alpha_standard : alpha_enhanced;
|
|
ahpla = (rfc1113compliant) ? ahpla_standard : ahpla_enhanced;
|
|
|
|
this.log = new serverLog("BASE64");
|
|
}
|
|
|
|
public static byte[] zero(int length) {
|
|
byte[] z = new byte[length];
|
|
while (length > 0) { length--; z[length] = (byte) alpha_standard[0]; }
|
|
return z;
|
|
}
|
|
|
|
public kelondroOrder<byte[]> clone() {
|
|
kelondroBase64Order o = new kelondroBase64Order(this.asc, this.rfc1113compliant);
|
|
o.rotate(zero);
|
|
return o;
|
|
}
|
|
|
|
public final boolean wellformed(byte[] a) {
|
|
return wellformed(a, 0, a.length);
|
|
}
|
|
|
|
public final boolean wellformed(byte[] a, int astart, int alength) {
|
|
assert (astart + alength <= a.length) : "astart = " + astart + ", alength = " + alength + ", a.length = " + a.length;
|
|
int b;
|
|
for (int i = astart + alength - 1; i >= astart; i--) {
|
|
b = a[i];
|
|
if ((b < 0) || (b >= 128) || (ahpla[b] == -1)) return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
public final static kelondroByteOrder bySignature(String signature) {
|
|
if (signature.equals("Bd")) return new kelondroBase64Order(false, false);
|
|
if (signature.equals("bd")) return new kelondroBase64Order(false, true);
|
|
if (signature.equals("Bu")) return new kelondroBase64Order(true, false);
|
|
if (signature.equals("bu")) return new kelondroBase64Order(true, true);
|
|
return null;
|
|
}
|
|
|
|
public final String signature() {
|
|
if ((!asc) && (!rfc1113compliant)) return "Bd";
|
|
if ((!asc) && ( rfc1113compliant)) return "bd";
|
|
if (( asc) && (!rfc1113compliant)) return "Bu";
|
|
if (( asc) && ( rfc1113compliant)) return "bu";
|
|
return null;
|
|
}
|
|
|
|
public final char encodeByte(byte b) {
|
|
return (char) alpha[b];
|
|
}
|
|
|
|
public final byte decodeByte(char b) {
|
|
return ahpla[b];
|
|
}
|
|
|
|
public final String encodeLongSmart(long c, int length) {
|
|
if (c >= max(length)) {
|
|
StringBuffer s = new StringBuffer(length);
|
|
s.setLength(length);
|
|
while (length > 0) s.setCharAt(--length, alpha[63]);
|
|
return new String(s);
|
|
}
|
|
return encodeLong(c, length);
|
|
}
|
|
|
|
public final String encodeLong(long c, int length) {
|
|
StringBuffer s = new StringBuffer(length);
|
|
s.setLength(length);
|
|
while (length > 0) {
|
|
s.setCharAt(--length, alpha[(byte) (c & 0x3F)]);
|
|
c >>= 6;
|
|
}
|
|
return new String(s);
|
|
}
|
|
|
|
public final void encodeLong(long c, byte[] b, int offset, int length) {
|
|
assert offset + length <= b.length;
|
|
while (length > 0) {
|
|
b[--length + offset] = (byte) alpha[(byte) (c & 0x3F)];
|
|
c >>= 6;
|
|
}
|
|
}
|
|
|
|
public final long decodeLong(String s) {
|
|
while (s.endsWith("=")) s = s.substring(0, s.length() - 1);
|
|
long c = 0;
|
|
for (int i = 0; i < s.length(); i++) c = (c << 6) | ahpla[s.charAt(i)];
|
|
return c;
|
|
}
|
|
|
|
public final long decodeLong(byte[] s, int offset, int length) {
|
|
while ((length > 0) && (s[offset + length - 1] == '=')) length--;
|
|
long c = 0;
|
|
for (int i = 0; i < length; i++) c = (c << 6) | ahpla[s[offset + i]];
|
|
return c;
|
|
}
|
|
|
|
public static long max(int len) {
|
|
// computes the maximum number that can be coded with a base64-encoded
|
|
// String of base len
|
|
long c = 0;
|
|
for (int i = 0; i < len; i++) c = (c << 6) | 63;
|
|
return c;
|
|
}
|
|
|
|
public final String encodeString(String in) {
|
|
try {
|
|
return encode(in.getBytes("UTF-8"));
|
|
} catch (UnsupportedEncodingException e) {
|
|
return "";
|
|
}
|
|
}
|
|
|
|
// we will use this encoding to encode strings with 2^8 values to
|
|
// b64-Strings
|
|
// we will do that by grouping each three input bytes to four output bytes.
|
|
public final String encode(byte[] in) {
|
|
if (in.length == 0) return "";
|
|
StringBuffer out = new StringBuffer(in.length / 3 * 4 + 3);
|
|
int pos = 0;
|
|
long l;
|
|
while (in.length - pos >= 3) {
|
|
l = ((((0XffL & (long) in[pos]) << 8) + (0XffL & (long) in[pos + 1])) << 8) + (0XffL & (long) in[pos + 2]);
|
|
pos += 3;
|
|
out = out.append(encodeLong(l, 4));
|
|
}
|
|
// now there may be remaining bytes
|
|
if (in.length % 3 != 0) out = out.append((in.length % 3 == 2) ? encodeLong((((0XffL & (long) in[pos]) << 8) + (0XffL & (long) in[pos + 1])) << 8, 4).substring(0, 3) : encodeLong((((0XffL & (long) in[pos])) << 8) << 8, 4).substring(0, 2));
|
|
if (rfc1113compliant) while (out.length() % 4 > 0) out.append("=");
|
|
// return result
|
|
return new String(out);
|
|
}
|
|
|
|
public final String decodeString(String in, String info) {
|
|
try {
|
|
//return new String(decode(in), "ISO-8859-1");
|
|
return new String(decode(in, info), "UTF-8");
|
|
} catch (java.io.UnsupportedEncodingException e) {
|
|
System.out.println("internal error in base64: " + e.getMessage());
|
|
return null;
|
|
}
|
|
}
|
|
|
|
public final byte[] decode(String in, String info) {
|
|
if ((in == null) || (in.length() == 0)) return new byte[0];
|
|
try {
|
|
int posIn = 0;
|
|
int posOut = 0;
|
|
if (rfc1113compliant) while (in.charAt(in.length() - 1) == '=') in = in.substring(0, in.length() - 1);
|
|
byte[] out = new byte[in.length() / 4 * 3 + (((in.length() % 4) == 0) ? 0 : in.length() % 4 - 1)];
|
|
long l;
|
|
while (posIn + 3 < in.length()) {
|
|
l = decodeLong(in.substring(posIn, posIn + 4));
|
|
out[posOut + 2] = (byte) (l % 256);
|
|
l = l / 256;
|
|
out[posOut + 1] = (byte) (l % 256);
|
|
l = l / 256;
|
|
out[posOut] = (byte) (l % 256);
|
|
l = l / 256;
|
|
posIn += 4;
|
|
posOut += 3;
|
|
}
|
|
if (posIn < in.length()) {
|
|
if (in.length() - posIn == 3) {
|
|
l = decodeLong(in.substring(posIn) + "A");
|
|
l = l / 256;
|
|
out[posOut + 1] = (byte) (l % 256);
|
|
l = l / 256;
|
|
out[posOut] = (byte) (l % 256);
|
|
l = l / 256;
|
|
} else {
|
|
l = decodeLong(in.substring(posIn) + "AA");
|
|
l = l / 256 / 256;
|
|
out[posOut] = (byte) (l % 256);
|
|
l = l / 256;
|
|
}
|
|
}
|
|
return out;
|
|
} catch (ArrayIndexOutOfBoundsException e) {
|
|
// maybe the input was not base64
|
|
// throw new RuntimeException("input probably not base64");
|
|
this.log.logFine("wrong string receive: " + in + ", call: " + info);
|
|
return new byte[0];
|
|
}
|
|
}
|
|
|
|
private final long cardinalI(byte[] key) {
|
|
// returns a cardinal number in the range of 0 .. Long.MAX_VALUE
|
|
long c = 0;
|
|
int p = 0;
|
|
while ((p < 10) && (p < key.length)) c = (c << 6) | ahpla[key[p++]];
|
|
while (p++ < 10) c = (c << 6);
|
|
c = c << 3;
|
|
return c;
|
|
}
|
|
|
|
public final long cardinal(byte[] key) {
|
|
if (this.zero == null) return cardinalI(key);
|
|
long zeroCardinal = cardinalI(this.zero);
|
|
long keyCardinal = cardinalI(key);
|
|
if (keyCardinal > zeroCardinal) return keyCardinal - zeroCardinal;
|
|
return Long.MAX_VALUE - keyCardinal + zeroCardinal;
|
|
}
|
|
|
|
private static final int sig(int x) {
|
|
return (x > 0) ? 1 : (x < 0) ? -1 : 0;
|
|
}
|
|
|
|
public final int compare(byte[] a, byte[] b) {
|
|
return (asc) ? compare0(a, 0, a.length, b, 0, b.length) : compare0(b, 0, b.length, a, 0, a.length);
|
|
}
|
|
|
|
public final int compare(byte[] a, int aoffset, int alength, byte[] b, int boffset, int blength) {
|
|
return (asc) ? compare0(a, aoffset, alength, b, boffset, blength) : compare0(b, boffset, blength, a, aoffset, alength);
|
|
}
|
|
|
|
public final int compare0(byte[] a, int aoffset, int alength, byte[] b, int boffset, int blength) {
|
|
if (zero == null) return compares(a, aoffset, alength, b, boffset, blength);
|
|
// we have an artificial start point. check all combinations
|
|
int az = compares(a, aoffset, alength, zero, 0, Math.min(alength, zero.length)); // -1 if a < z; 0 if a == z; 1 if a > z
|
|
int bz = compares(b, boffset, blength, zero, 0, Math.min(blength, zero.length)); // -1 if b < z; 0 if b == z; 1 if b > z
|
|
if (az == bz) return compares(a, aoffset, alength, b, boffset, blength);
|
|
return sig(az - bz);
|
|
}
|
|
|
|
public final int compares(byte[] a, int aoffset, int alength, byte[] b, int boffset, int blength) {
|
|
assert (aoffset + alength <= a.length) : "a.length = " + a.length + ", aoffset = " + aoffset + ", alength = " + alength;
|
|
assert (boffset + blength <= b.length) : "b.length = " + b.length + ", boffset = " + boffset + ", blength = " + blength;
|
|
assert (ahpla.length == 128);
|
|
int i = 0;
|
|
final int al = Math.min(alength, a.length - aoffset);
|
|
final int bl = Math.min(blength, b.length - boffset);
|
|
byte ac, bc;
|
|
byte acc, bcc;
|
|
while ((i < al) && (i < bl)) {
|
|
assert (i + aoffset < a.length) : "i = " + i + ", aoffset = " + aoffset + ", a.length = " + a.length + ", a = " + serverLog.arrayList(a, aoffset, al);
|
|
assert (i + boffset < b.length) : "i = " + i + ", boffset = " + boffset + ", b.length = " + b.length + ", b = " + serverLog.arrayList(b, boffset, al);
|
|
ac = a[aoffset + i];
|
|
assert (ac >= 0) && (ac < 128) : "ac = " + ac + ", a = " + serverLog.arrayList(a, aoffset, al);
|
|
bc = b[boffset + i];
|
|
if ((ac == 0) && (bc == 0)) return 0; // zero-terminated length
|
|
assert (bc >= 0) && (bc < 128) : "bc = " + bc + ", b = " + serverLog.arrayList(b, boffset, al);
|
|
acc = ahpla[ac];
|
|
assert (acc >= 0) : "acc = " + acc + ", a = " + serverLog.arrayList(a, aoffset, al) + "/" + new String(a, aoffset, al) + ", aoffset = 0x" + Integer.toHexString(aoffset) + ", i = " + i + "\n" + serverLog.table(a, 16, aoffset);
|
|
bcc = ahpla[bc];
|
|
assert (bcc >= 0) : "bcc = " + bcc + ", b = " + serverLog.arrayList(b, boffset, al) + "/" + new String(b, boffset, al) + ", boffset = 0x" + Integer.toHexString(boffset) + ", i = " + i + "\n" + serverLog.table(b, 16, boffset);
|
|
if (acc > bcc) return 1;
|
|
if (acc < bcc) return -1;
|
|
// else the bytes are equal and it may go on yet undecided
|
|
i++;
|
|
}
|
|
// compare length
|
|
if (al > bl) return 1;
|
|
if (al < bl) return -1;
|
|
// they are equal
|
|
return 0;
|
|
}
|
|
|
|
public final int comparePivot(byte[] compiledPivot, byte[] b, int boffset, int blength) {
|
|
assert zero == null;
|
|
assert asc;
|
|
assert (boffset + blength <= b.length) : "b.length = " + b.length + ", boffset = " + boffset + ", blength = " + blength;
|
|
int i = 0;
|
|
final int bl = Math.min(blength, b.length - boffset);
|
|
byte acc, bcc;
|
|
while ((i < compiledPivot.length) && (i < bl)) {
|
|
acc = compiledPivot[i];
|
|
bcc = ahpla[b[boffset + i]];
|
|
if (acc > bcc) return 1;
|
|
if (acc < bcc) return -1;
|
|
// else the bytes are equal and it may go on yet undecided
|
|
i++;
|
|
}
|
|
// compare length
|
|
if (compiledPivot.length > bl) return 1;
|
|
if (compiledPivot.length < bl) return -1;
|
|
// they are equal
|
|
return 0;
|
|
}
|
|
|
|
public final byte[] compilePivot(byte[] a, int aoffset, int alength) {
|
|
assert (aoffset + alength <= a.length) : "a.length = " + a.length + ", aoffset = " + aoffset + ", alength = " + alength;
|
|
byte[] cp = new byte[Math.min(alength, a.length - aoffset)];
|
|
for (int i = cp.length - 1; i >= 0; i--) {
|
|
cp[i] = ahpla[a[aoffset + i]];
|
|
}
|
|
return cp;
|
|
}
|
|
|
|
public static void main(String[] s) {
|
|
kelondroBase64Order b64 = new kelondroBase64Order(true, true);
|
|
if (s.length == 0) {
|
|
System.out.println("usage: -[ec|dc|es|ds|s2m] <arg>");
|
|
System.exit(0);
|
|
}
|
|
if (s[0].equals("-ec")) {
|
|
// generate a b64 encoding from a given cardinal
|
|
System.out.println(b64.encodeLong(Long.parseLong(s[1]), 4));
|
|
}
|
|
if (s[0].equals("-dc")) {
|
|
// generate a b64 decoding from a given cardinal
|
|
System.out.println(b64.decodeLong(s[1]));
|
|
}
|
|
if (s[0].equals("-es")) {
|
|
// generate a b64 encoding from a given string
|
|
System.out.println(b64.encodeString(s[1]));
|
|
}
|
|
if (s[0].equals("-ds")) {
|
|
// generate a b64 decoding from a given string
|
|
System.out.println(b64.decodeString(s[1], ""));
|
|
}
|
|
}
|
|
}
|