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mobile/android/thirdparty/ch/boye/httpclientandroidlib/client/utils/Rfc3492Idn.java@fc2d59ddac77 (annotated)

mobile/android/thirdparty/ch/boye/httpclientandroidlib/client/utils/Rfc3492Idn.java

Wed, 31 Dec 2014 07:22:50 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Wed, 31 Dec 2014 07:22:50 +0100

branch

TOR_BUG_3246

changeset 4

fc2d59ddac77

permissions

-rw-r--r--

Correct previous dual key logic pending first delivery installment.

michael@0	1	/*
michael@0	2	* $HeadURL$
michael@0	3	* $Revision$
michael@0	4	* $Date$
michael@0	5	*
michael@0	6	* ====================================================================
michael@0	7	*
michael@0	8	* Licensed to the Apache Software Foundation (ASF) under one or more
michael@0	9	* contributor license agreements. See the NOTICE file distributed with
michael@0	10	* this work for additional information regarding copyright ownership.
michael@0	11	* The ASF licenses this file to You under the Apache License, Version 2.0
michael@0	12	* (the "License"); you may not use this file except in compliance with
michael@0	13	* the License. You may obtain a copy of the License at
michael@0	14	*
michael@0	15	* http://www.apache.org/licenses/LICENSE-2.0
michael@0	16	*
michael@0	17	* Unless required by applicable law or agreed to in writing, software
michael@0	18	* distributed under the License is distributed on an "AS IS" BASIS,
michael@0	19	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
michael@0	20	* See the License for the specific language governing permissions and
michael@0	21	* limitations under the License.
michael@0	22	* ====================================================================
michael@0	23	*
michael@0	24	* This software consists of voluntary contributions made by many
michael@0	25	* individuals on behalf of the Apache Software Foundation. For more
michael@0	26	* information on the Apache Software Foundation, please see
michael@0	27	* <http://www.apache.org/>.
michael@0	28	*
michael@0	29	*/
michael@0	30
michael@0	31	package ch.boye.httpclientandroidlib.client.utils;
michael@0	32
michael@0	33	import java.util.StringTokenizer;
michael@0	34
michael@0	35	import ch.boye.httpclientandroidlib.annotation.Immutable;
michael@0	36
michael@0	37	/**
michael@0	38	* Implementation from pseudo code in RFC 3492.
michael@0	39	*
michael@0	40	* @since 4.0
michael@0	41	*/
michael@0	42	@Immutable
michael@0	43	public class Rfc3492Idn implements Idn {
michael@0	44	private static final int base = 36;
michael@0	45	private static final int tmin = 1;
michael@0	46	private static final int tmax = 26;
michael@0	47	private static final int skew = 38;
michael@0	48	private static final int damp = 700;
michael@0	49	private static final int initial_bias = 72;
michael@0	50	private static final int initial_n = 128;
michael@0	51	private static final char delimiter = '-';
michael@0	52	private static final String ACE_PREFIX = "xn--";
michael@0	53
michael@0	54	private int adapt(int delta, int numpoints, boolean firsttime) {
michael@0	55	if (firsttime) delta = delta / damp;
michael@0	56	else delta = delta / 2;
michael@0	57	delta = delta + (delta / numpoints);
michael@0	58	int k = 0;
michael@0	59	while (delta > ((base - tmin) * tmax) / 2) {
michael@0	60	delta = delta / (base - tmin);
michael@0	61	k = k + base;
michael@0	62	}
michael@0	63	return k + (((base - tmin + 1) * delta) / (delta + skew));
michael@0	64	}
michael@0	65
michael@0	66	private int digit(char c) {
michael@0	67	if ((c >= 'A') && (c <= 'Z')) return (c - 'A');
michael@0	68	if ((c >= 'a') && (c <= 'z')) return (c - 'a');
michael@0	69	if ((c >= '0') && (c <= '9')) return (c - '0') + 26;
michael@0	70	throw new IllegalArgumentException("illegal digit: "+ c);
michael@0	71	}
michael@0	72
michael@0	73	public String toUnicode(String punycode) {
michael@0	74	StringBuilder unicode = new StringBuilder(punycode.length());
michael@0	75	StringTokenizer tok = new StringTokenizer(punycode, ".");
michael@0	76	while (tok.hasMoreTokens()) {
michael@0	77	String t = tok.nextToken();
michael@0	78	if (unicode.length() > 0) unicode.append('.');
michael@0	79	if (t.startsWith(ACE_PREFIX)) t = decode(t.substring(4));
michael@0	80	unicode.append(t);
michael@0	81	}
michael@0	82	return unicode.toString();
michael@0	83	}
michael@0	84
michael@0	85	protected String decode(String input) {
michael@0	86	int n = initial_n;
michael@0	87	int i = 0;
michael@0	88	int bias = initial_bias;
michael@0	89	StringBuilder output = new StringBuilder(input.length());
michael@0	90	int lastdelim = input.lastIndexOf(delimiter);
michael@0	91	if (lastdelim != -1) {
michael@0	92	output.append(input.subSequence(0, lastdelim));
michael@0	93	input = input.substring(lastdelim + 1);
michael@0	94	}
michael@0	95
michael@0	96	while (input.length() > 0) {
michael@0	97	int oldi = i;
michael@0	98	int w = 1;
michael@0	99	for (int k = base;; k += base) {
michael@0	100	if (input.length() == 0) break;
michael@0	101	char c = input.charAt(0);
michael@0	102	input = input.substring(1);
michael@0	103	int digit = digit(c);
michael@0	104	i = i + digit * w; // FIXME fail on overflow
michael@0	105	int t;
michael@0	106	if (k <= bias + tmin) {
michael@0	107	t = tmin;
michael@0	108	} else if (k >= bias + tmax) {
michael@0	109	t = tmax;
michael@0	110	} else {
michael@0	111	t = k - bias;
michael@0	112	}
michael@0	113	if (digit < t) break;
michael@0	114	w = w * (base - t); // FIXME fail on overflow
michael@0	115	}
michael@0	116	bias = adapt(i - oldi, output.length() + 1, (oldi == 0));
michael@0	117	n = n + i / (output.length() + 1); // FIXME fail on overflow
michael@0	118	i = i % (output.length() + 1);
michael@0	119	// {if n is a basic code point then fail}
michael@0	120	output.insert(i, (char) n);
michael@0	121	i++;
michael@0	122	}
michael@0	123	return output.toString();
michael@0	124	}
michael@0	125
michael@0	126	}