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282 lines
11 KiB
282 lines
11 KiB
// kelondroBase64Order.java
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// -----------------------
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// part of The Kelondro Database
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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, 2005
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// created 03.01.2006
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//
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// $LastChangedDate: 2005-09-22 22:01:26 +0200 (Thu, 22 Sep 2005) $
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// $LastChangedRevision: 774 $
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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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//
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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.kelondro;
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import java.util.Comparator;
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public class kelondroBase64Order extends kelondroAbstractOrder implements kelondroOrder, kelondroCoding, Comparator {
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private static final char[] alpha_standard = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
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private static final char[] alpha_enhanced = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_".toCharArray();
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private static final byte[] ahpla_standard = new byte[256];
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private static final byte[] ahpla_enhanced = new byte[256];
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static {
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for (int i = 0; i < 256; i++) {
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ahpla_standard[i] = -1;
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ahpla_enhanced[i] = -1;
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}
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for (int i = 0; i < alpha_standard.length; i++) {
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ahpla_standard[alpha_standard[i]] = (byte) i;
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ahpla_enhanced[alpha_enhanced[i]] = (byte) i;
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}
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}
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public static final kelondroBase64Order standardCoder = new kelondroBase64Order(true, true);
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public static final kelondroBase64Order enhancedCoder = new kelondroBase64Order(true, false);
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private boolean rfc1113compliant;
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private boolean asc;
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private final char[] alpha;
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private final byte[] ahpla;
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public kelondroBase64Order(boolean up, boolean rfc1113compliant) {
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// if we choose not to be rfc1113compliant,
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// then we get shorter base64 results which are also filename-compatible
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this.rfc1113compliant = rfc1113compliant;
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this.asc = up;
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alpha = (rfc1113compliant) ? alpha_standard : alpha_enhanced;
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ahpla = (rfc1113compliant) ? ahpla_standard : ahpla_enhanced;
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}
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public static kelondroOrder bySignature(String signature) {
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if (signature.equals("Bd")) return new kelondroBase64Order(false, false);
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if (signature.equals("bd")) return new kelondroBase64Order(false, true);
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if (signature.equals("Bu")) return new kelondroBase64Order(true, false);
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if (signature.equals("bu")) return new kelondroBase64Order(true, true);
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return null;
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}
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public String signature() {
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if ((!asc) && (!rfc1113compliant)) return "Bd";
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if ((!asc) && ( rfc1113compliant)) return "bd";
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if (( asc) && (!rfc1113compliant)) return "Bu";
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if (( asc) && ( rfc1113compliant)) return "bu";
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return null;
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}
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public char encodeByte(byte b) {
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return (char) alpha[b];
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}
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public byte decodeByte(char b) {
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return ahpla[b];
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}
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public String encodeLongSmart(long c, int length) {
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if (c >= max(length)) {
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StringBuffer s = new StringBuffer(length);
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s.setLength(length);
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while (length > 0) s.setCharAt(--length, alpha[63]);
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return s.toString();
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} else {
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return encodeLong(c, length);
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}
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}
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public String encodeLong(long c, int length) {
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StringBuffer s = new StringBuffer(length);
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s.setLength(length);
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while (length > 0) {
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s.setCharAt(--length, alpha[(byte) (c & 0x3F)]);
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c >>= 6;
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}
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return s.toString();
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}
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public long decodeLong(String s) {
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while (s.endsWith("="))
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s = s.substring(0, s.length() - 1);
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long c = 0;
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for (int i = 0; i < s.length(); i++) c = (c << 6) | ahpla[s.charAt(i)];
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return c;
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}
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public static long max(int len) {
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// computes the maximum number that can be coded with a base64-encoded
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// String of base len
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long c = 0;
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for (int i = 0; i < len; i++) c = (c << 6) | 63;
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return c;
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}
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public String encodeString(String in) {
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return encode(in.getBytes());
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}
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// we will use this encoding to encode strings with 2^8 values to
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// b64-Strings
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// we will do that by grouping each three input bytes to four output bytes.
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public String encode(byte[] in) {
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StringBuffer out = new StringBuffer(in.length / 3 * 4 + 3);
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int pos = 0;
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long l;
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while (in.length - pos >= 3) {
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l = ((((0XffL & (long) in[pos]) << 8) + (0XffL & (long) in[pos + 1])) << 8) + (0XffL & (long) in[pos + 2]);
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pos += 3;
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out = out.append(encodeLong(l, 4));
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}
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// now there may be remaining bytes
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if (in.length % 3 != 0)
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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));
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if (rfc1113compliant)
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while (out.length() % 4 > 0)
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out.append("=");
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// return result
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return out.toString();
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}
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public String decodeString(String in) {
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try {
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//return new String(decode(in), "ISO-8859-1");
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return new String(decode(in), "UTF-8");
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} catch (java.io.UnsupportedEncodingException e) {
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System.out.println("internal error in base64: " + e.getMessage());
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return null;
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}
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}
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public byte[] decode(String in) {
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try {
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int posIn = 0;
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int posOut = 0;
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if (rfc1113compliant)
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while (in.charAt(in.length() - 1) == '=')
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in = in.substring(0, in.length() - 1);
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byte[] out = new byte[in.length() / 4 * 3 + (((in.length() % 4) == 0) ? 0 : in.length() % 4 - 1)];
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long l;
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while (posIn + 3 < in.length()) {
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l = decodeLong(in.substring(posIn, posIn + 4));
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out[posOut + 2] = (byte) (l % 256);
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l = l / 256;
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out[posOut + 1] = (byte) (l % 256);
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l = l / 256;
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out[posOut] = (byte) (l % 256);
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l = l / 256;
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posIn += 4;
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posOut += 3;
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}
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if (posIn < in.length()) {
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if (in.length() - posIn == 3) {
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l = decodeLong(in.substring(posIn) + "A");
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l = l / 256;
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out[posOut + 1] = (byte) (l % 256);
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l = l / 256;
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out[posOut] = (byte) (l % 256);
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l = l / 256;
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} else {
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l = decodeLong(in.substring(posIn) + "AA");
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l = l / 256 / 256;
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out[posOut] = (byte) (l % 256);
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l = l / 256;
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}
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}
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return out;
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} catch (ArrayIndexOutOfBoundsException e) {
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// maybe the input was not base64
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throw new RuntimeException("input probably not base64");
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}
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}
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public long cardinal(byte[] key) {
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// returns a cardinal number in the range of 0 .. Long.MAX_VALUE
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long c = 0;
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int p = 0;
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while ((p < 10) && (p < key.length)) c = (c << 6) | ahpla[key[p++]];
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while (p++ < 10) c = (c << 6);
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c = c << 3;
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return c;
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}
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public int compare(byte[] a, byte[] b) {
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int i = 0;
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final int al = a.length;
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final int bl = b.length;
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final int len = (al > bl) ? bl : al;
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while (i < len) {
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if (ahpla[a[i]] > ahpla[b[i]]) return (asc) ? 1 : -1;
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if (ahpla[a[i]] < ahpla[b[i]]) return (asc) ? -1 : 1;
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// else the bytes are equal and it may go on yet undecided
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i++;
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}
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// check if we have a zero-terminated equality
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if ((i == al) && (i < bl) && (b[i] == 0)) return 0;
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if ((i == bl) && (i < al) && (a[i] == 0)) return 0;
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// no, decide by length
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if (al > bl) return (asc) ? 1 : -1;
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if (al < bl) return (asc) ? -1 : 1;
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// no, they are equal
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return 0;
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}
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public static void main(String[] s) {
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kelondroBase64Order b64 = new kelondroBase64Order(true, true);
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if (s.length == 0) {
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System.out.println("usage: -[ec|dc|es|ds|s2m] <arg>");
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System.exit(0);
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}
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if (s[0].equals("-ec")) {
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// generate a b64 encoding from a given cardinal
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System.out.println(b64.encodeLong(Long.parseLong(s[1]), 4));
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}
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if (s[0].equals("-dc")) {
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// generate a b64 decoding from a given cardinal
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System.out.println(b64.decodeLong(s[1]));
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}
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if (s[0].equals("-es")) {
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// generate a b64 encoding from a given string
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System.out.println(b64.encodeString(s[1]));
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}
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if (s[0].equals("-ds")) {
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// generate a b64 decoding from a given string
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System.out.println(b64.decodeString(s[1]));
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}
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}
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}
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