package org.noahx.uuid.utils;import java.io.UnsupportedEncodingException;
import java.math.BigInteger;/*** Created with IntelliJ IDEA.* User: noah* Date: 8/2/13* Time: 10:36 AM* To change this template use File | Settings | File Templates.*/
public class Base58 {public static final char[] ALPHABET = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz".toCharArray();private static final int[] INDEXES = new int[128];static {for (int i = 0; i < INDEXES.length; i++) {INDEXES[i] = -1;}for (int i = 0; i < ALPHABET.length; i++) {INDEXES[ALPHABET[i]] = i;}}/*** Encodes the given bytes in base58. No checksum is appended.*/public static String encode(byte[] input) {if (input.length == 0) {return "";}input = copyOfRange(input, 0, input.length);// Count leading zeroes.int zeroCount = 0;while (zeroCount < input.length && input[zeroCount] == 0) {++zeroCount;}// The actual encoding.byte[] temp = new byte[input.length * 2];int j = temp.length;int startAt = zeroCount;while (startAt < input.length) {byte mod = divmod58(input, startAt);if (input[startAt] == 0) {++startAt;}temp[--j] = (byte) ALPHABET[mod];}// Strip extra '1' if there are some after decoding.while (j < temp.length && temp[j] == ALPHABET[0]) {++j;}// Add as many leading '1' as there were leading zeros.while (--zeroCount >= 0) {temp[--j] = (byte) ALPHABET[0];}byte[] output = copyOfRange(temp, j, temp.length);try {return new String(output, "US-ASCII");} catch (UnsupportedEncodingException e) {throw new RuntimeException(e);  // Cannot happen.
        }}public static byte[] decode(String input) throws IllegalArgumentException {if (input.length() == 0) {return new byte[0];}byte[] input58 = new byte[input.length()];// Transform the String to a base58 byte sequencefor (int i = 0; i < input.length(); ++i) {char c = input.charAt(i);int digit58 = -1;if (c >= 0 && c < 128) {digit58 = INDEXES[c];}if (digit58 < 0) {throw new IllegalArgumentException("Illegal character " + c + " at " + i);}input58[i] = (byte) digit58;}// Count leading zeroesint zeroCount = 0;while (zeroCount < input58.length && input58[zeroCount] == 0) {++zeroCount;}// The encodingbyte[] temp = new byte[input.length()];int j = temp.length;int startAt = zeroCount;while (startAt < input58.length) {byte mod = divmod256(input58, startAt);if (input58[startAt] == 0) {++startAt;}temp[--j] = mod;}// Do no add extra leading zeroes, move j to first non null byte.while (j < temp.length && temp[j] == 0) {++j;}return copyOfRange(temp, j - zeroCount, temp.length);}public static BigInteger decodeToBigInteger(String input) throws IllegalArgumentException {return new BigInteger(1, decode(input));}//// number -> number / 58, returns number % 58//
    private static byte divmod58(byte[] number, int startAt) {int remainder = 0;for (int i = startAt; i < number.length; i++) {int digit256 = (int) number[i] & 0xFF;int temp = remainder * 256 + digit256;number[i] = (byte) (temp / 58);remainder = temp % 58;}return (byte) remainder;}//// number -> number / 256, returns number % 256//
    private static byte divmod256(byte[] number58, int startAt) {int remainder = 0;for (int i = startAt; i < number58.length; i++) {int digit58 = (int) number58[i] & 0xFF;int temp = remainder * 58 + digit58;number58[i] = (byte) (temp / 256);remainder = temp % 256;}return (byte) remainder;}private static byte[] copyOfRange(byte[] source, int from, int to) {byte[] range = new byte[to - from];System.arraycopy(source, from, range, 0, range.length);return range;}}

package org.noahx.uuid.util;import org.apache.commons.codec.binary.Base64;import java.nio.ByteBuffer;
import java.util.UUID;public abstract class UuidUtils {public static String uuid() {UUID uuid = UUID.randomUUID();return uuid.toString();}public static String base64Uuid() {UUID uuid = UUID.randomUUID();return base64Uuid(uuid);}protected static String base64Uuid(UUID uuid) {ByteBuffer bb = ByteBuffer.wrap(new byte[16]);bb.putLong(uuid.getMostSignificantBits());bb.putLong(uuid.getLeastSignificantBits());return Base64.encodeBase64URLSafeString(bb.array());}public static String encodeBase64Uuid(String uuidString) {UUID uuid = UUID.fromString(uuidString);return base64Uuid(uuid);}public static String decodeBase64Uuid(String compressedUuid) {byte[] byUuid = Base64.decodeBase64(compressedUuid);ByteBuffer bb = ByteBuffer.wrap(byUuid);UUID uuid = new UUID(bb.getLong(), bb.getLong());return uuid.toString();}public static String base58Uuid() {UUID uuid = UUID.randomUUID();return base58Uuid(uuid);}protected static String base58Uuid(UUID uuid) {ByteBuffer bb = ByteBuffer.wrap(new byte[16]);bb.putLong(uuid.getMostSignificantBits());bb.putLong(uuid.getLeastSignificantBits());return Base58.encode(bb.array());}public static String encodeBase58Uuid(String uuidString) {UUID uuid = UUID.fromString(uuidString);return base58Uuid(uuid);}public static String decodeBase58Uuid(String base58uuid) {byte[] byUuid = Base58.decode(base58uuid);ByteBuffer bb = ByteBuffer.wrap(byUuid);UUID uuid = new UUID(bb.getLong(), bb.getLong());return uuid.toString();}
}

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