115 lines
3.2 KiB
Java
115 lines
3.2 KiB
Java
/*
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* This file is part of the Wildfire Chat package.
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* (c) Heavyrain2012 <[email protected]>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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package win.liyufan.im;
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public class IDUtils {
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private static char getChar(int number) {
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if (number < 0 || number >= 64) {
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number = number % 64;
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}
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if (number < 26) {
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return (char)('A' + number);
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} else if(number < 52) {
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return (char)('a' + number - 26);
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} else if(number < 62) {
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return (char)('0' + number - 52);
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} else if(number == 62) {
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return '_';
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}
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return '-';
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}
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private static int getNumber(char ch) {
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if (ch >= 'A' && ch <= 'Z') {
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return ch - 'A';
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} else if(ch >= 'a' && ch <= 'z') {
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return ch - 'a' + 26;
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} else if(ch >= '0' && ch <= '9') {
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return ch - '0' + 52;
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} else if(ch == '+') {
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return 62;
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}
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return 63;
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}
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public static String toUid(int id) {
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StringBuilder sb = new StringBuilder();
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int rand0 = 0;
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int rand3 = 0;
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int rand6 = 0;
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for (int i = 0; i < 8; i++) {
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if (i == 0 || i == 3 || i == 6) {
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int rand = (int)(Math.random()*64+0.5);
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sb.append(getChar(rand));
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if (i == 0) {
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rand0 = rand;
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} else if (i == 3) {
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rand3 = rand;
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} else {
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rand6 = rand;
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}
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} else {
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if (i < 5) {
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sb.append(getChar((id + rand0) % 64));
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} else if(i == 5) {
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sb.append(getChar((id + rand3) % 64));
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} else {
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sb.append(getChar((id + rand6) % 64));
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}
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id = id / 64;
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}
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}
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return sb.toString();
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}
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public static int fromUid(String uid) {
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int id = 0;
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int rand0 = 0;
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int rand3 = 0;
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int rand6 = 0;
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for (int i = 0; i < 8; i++) {
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if (i == 0 || i == 3 || i == 6) {
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int rand = getNumber(uid.charAt(i));
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if (i == 0) {
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rand0 = rand;
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} else if (i == 3) {
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rand3 = rand;
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} else {
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rand6 = rand;
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}
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} else {
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int c = getNumber(uid.charAt(i));
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if (i < 5) {
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c = (c+64-rand0)%64;
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} else if(i == 5) {
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c = (c+64-rand3)%64;
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} else {
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c = (c+64-rand6)%64;
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}
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if (i < 3)
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id = id + (c << (i-1)*6);
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else if(i < 6)
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id = id + (c << (i-2)*6);
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else
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id = id + (c << (i-3)*6);
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}
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}
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return id;
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}
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public static void main(String[] args) {
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for (int i = 0; i < 100000000; i++) {
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String uid = toUid(i);
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System.out.println(i + ", " + uid + ", " + fromUid(uid));
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}
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}
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}
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