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/* This file is part of VoltDB.
* Copyright (C) 2008-2020 VoltDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with VoltDB. If not, see .
*/
package org.voltcore.utils;
/**
* This class implements the Punycode idn ACE encoder
* http://www.ietf.org/internet-drafts/draft-ietf-idn-punycode-02.txt
* it also escapes non e-mail safe characters to the unicode private
* range of 0xE000 to 0xE0F7
* @author Stefano Santoro (Java Port of C sample in the ietf draft)
* @version 1.0
*/
public final class Punycode {
private static final int punycode_success = 0;
private static final int punycode_bad_input = 1;
private static final int punycode_big_output = 2;
private static final int punycode_overflow = 3;
private static final int base = 36;
private static final int tmin = 1;
private static final int tmax = 26;
private static final int skew = 38;
private static final int damp = 700;
private static final int initial_bias = 72;
private static final int initial_n = 0x80;
private static final int delimiter = 0x2D;
private final static boolean basic( int cp) { return cp < 0x80; }
private final static boolean delim( int cp) { return cp == delimiter; }
private final static int decode_digit(char cp)
{
return cp - 48 < 10 ? cp - 22 : cp - 65 < 26 ? cp - 65 :
cp - 97 < 26 ? cp - 97 : base;
}
private final static char encode_digit(int d, boolean flag)
{
int shifter = (flag ? 1 : 0);
return (char)(d + 22 + 75 * (d < 26 ? 1 : 0) - (shifter << 5));
/* 0..25 map to ASCII a..z or A..Z */
/* 26..35 map to ASCII 0..9 */
}
private final static boolean flagged( int bcp) { return bcp - 65 < 26; }
private final static char encode_basic(int bcp, boolean flag)
{
bcp -= ((bcp - 97) < 26 ? 1 : 0) << 5;
int shifter = ((!flag && ((bcp - 65) < 26)) ? 1 : 0);
return (char)(bcp + shifter << 5);
}
private final static int maxint = Integer.MAX_VALUE;
private final static int adapt(int delta, int numpoints, boolean firsttime )
{
int k;
delta = firsttime ? delta / damp : delta >>> 1;
/* delta >> 1 is a faster way of doing delta / 2 */
delta += delta / numpoints;
for (k = 0; delta > ((base - tmin) * tmax) / 2; k += base) {
delta /= base - tmin;
}
return k + (base - tmin + 1) * delta / (delta + skew);
}
private final static class OutputLength {
int len = 0;
OutputLength( int aLength) { len = aLength; }
}
private final static int punycode_encode(
final int input[],
final boolean case_flags[],
OutputLength output_length,
char output[] )
{
int n, delta, h, b, out, max_out, bias, j, m, q, k, t;
/* Initialize the state: */
int input_length = input.length;
n = initial_n;
delta = 0;
out = 0;
max_out = output_length.len;
bias = initial_bias;
/* Handle the basic code points: */
for (j = 0; j < input_length; ++j) {
if (basic(input[j])) {
if (max_out - out < 2) return punycode_big_output;
output[out++] =
case_flags != null? encode_basic(input[j], case_flags[j]) : (char)input[j];
}
/* else if (input[j] < n) return punycode_bad_input; */
/* (not needed for Punycode with unsigned code points) */
}
h = b = out;
/* h is the number of code points that have been handled, b is the */
/* number of basic code points, and out is the number of characters */
/* that have been output. */
if (b > 0) output[out++] = delimiter;
/* Main encoding loop: */
while (h < input_length) {
/* All non-basic code points < n have been */
/* handled already. Find the next larger one: */
for (m = maxint, j = 0; j < input_length; ++j) {
/* if (basic(input[j])) continue; */
/* (not needed for Punycode) */
if (input[j] >= n && input[j] < m) m = input[j];
}
/* Increase delta enough to advance the decoder's */
/* state to , but guard against overflow: */
if (m - n > (maxint - delta) / (h + 1)) return punycode_overflow;
delta += (m - n) * (h + 1);
n = m;
for (j = 0; j < input_length; ++j) {
/* Punycode does not need to check whether input[j] is basic: */
if (input[j] < n /* || basic(input[j]) */ ) {
if (++delta == 0) return punycode_overflow;
}
if (input[j] == n) {
/* Represent delta as a generalized variable-length integer: */
for (q = delta, k = base; ; k += base) {
if (out >= max_out) return punycode_big_output;
t = k <= bias /* + tmin */ ? tmin : /* +tmin not needed */
k >= bias + tmax ? tmax : k - bias;
if (q < t) break;
output[out++] = encode_digit(t + (q - t) % (base - t), false);
q = (q - t) / (base - t);
}
output[out++] = encode_digit(q, case_flags != null && case_flags[j]);
bias = adapt(delta, h + 1, h == b);
delta = 0;
++h;
}
}
++delta;
++n;
}
output_length.len = out;
return punycode_success;
}
private final static int punycode_decode(
final char input[],
OutputLength output_length,
int output[],
boolean case_flags[] )
{
int n, out, i, max_out, bias,
b, j, in, oldi, w, k, digit, t;
/* Initialize the state: */
int input_length = input.length;
n = initial_n;
out = i = 0;
max_out = output_length.len;
bias = initial_bias;
/* Handle the basic code points: Let b be the number of input code */
/* points before the last delimiter, or 0 if there is none, then */
/* copy the first b code points to the output. */
for (b = j = 0; j < input_length; ++j) if (delim(input[j])) b = j;
if (b > max_out) return punycode_big_output;
for (j = 0; j < b; ++j) {
if (case_flags != null) case_flags[out] = flagged(input[j]);
if (!basic(input[j])) return punycode_bad_input;
output[out++] = input[j];
}
/* Main decoding loop: Start just after the last delimiter if any */
/* basic code points were copied; start at the beginning otherwise. */
for (in = b > 0 ? b + 1 : 0; in < input_length; ++out) {
/* in is the index of the next character to be consumed, and */
/* out is the number of code points in the output array. */
/* Decode a generalized variable-length integer into delta, */
/* which gets added to i. The overflow checking is easier */
/* if we increase i as we go, then subtract off its starting */
/* value at the end to obtain delta. */
for (oldi = i, w = 1, k = base; ; k += base) {
if (in >= input_length) return punycode_bad_input;
digit = decode_digit(input[in++]);
if (digit >= base) return punycode_bad_input;
if (digit > (maxint - i) / w) return punycode_overflow;
i += digit * w;
t = (k <= bias /* + tmin */ ? tmin : /* +tmin not needed */
(k >= bias + tmax ? tmax : k - bias));
if (digit < t) break;
if (w > maxint / (base - t)) return punycode_overflow;
w *= (base - t);
}
bias = adapt(i - oldi, out + 1, oldi == 0);
/* i was supposed to wrap around from out+1 to 0, */
/* incrementing n each time, so we'll fix that now: */
if (i / (out + 1) > maxint - n) return punycode_overflow;
n += i / (out + 1);
i %= (out + 1);
/* Insert n at position i of the output: */
/* not needed for Punycode: */
/* if (decode_digit(n) <= base) return punycode_invalid_input; */
if (out >= max_out) return punycode_big_output;
if (case_flags != null) {
System.arraycopy(case_flags, i, case_flags, i+1, out - i);
/* Case of last character determines uppercase flag: */
case_flags[i] = flagged(input[in - 1]);
}
System.arraycopy(output, i, output, i + 1, (out - i) * 4);
output[i++] = n;
}
output_length.len = out;
return punycode_success;
}
private final static char escape_email_unsafe( char c)
throws IllegalArgumentException
{
if( c >= 0xe000 && c < 0xf8ff) {
throw new IllegalArgumentException
("character in unicode private range");
}
if( c > 0x7f) return c;
if( (c>=97 && c<123) || (c>=48 && c<58) || (c>=65&& c<91)) return c;
if( c == 46 || c == 45 || c == 95) return c;
return (char)(0xe000 + c);
}
private final static char unescape_email_unsafe( char c) {
if( c>=0xe000 && c<0xf8ff) return (char)(c - 0xe000);
return c;
}
public final static String encode( String aContent)
throws IllegalArgumentException
{
int [] iInput = new int[aContent.length()];
char [] cInput = aContent.toCharArray();
for( int i = 0; i < iInput.length; ++i) {
iInput[i] = escape_email_unsafe(cInput[i]);
}
char [] cOutput = new char[cInput.length << 2];
OutputLength ol = new OutputLength( cOutput.length);
int rc = punycode_encode( iInput, null, ol, cOutput);
if( rc != punycode_success) {
throw new IllegalArgumentException("could not puny encode: "+rc);
}
return new String( cOutput, 0, ol.len);
}
public final static String decode( String aContent)
throws IllegalArgumentException
{
int [] iOutput = new int[ aContent.length() << 2];
char [] cOutput;
char [] cInput = aContent.toCharArray();
OutputLength ol = new OutputLength( iOutput.length);
int rc = punycode_decode( cInput, ol, iOutput, null);
if( rc != punycode_success) {
throw new IllegalArgumentException("could not puny decode: "+rc);
}
cOutput = new char[ol.len];
for( int i = 0; i < ol.len; ++i) {
cOutput[i] = unescape_email_unsafe((char)iOutput[i]);
}
return new String( cOutput);
}
}
