joomla-eboracast /libraries/idna_convert/uctc.php

Language PHP Lines 300
MD5 Hash 6591c9a5509bf525b29fc6ded3962d34 Estimated Cost $5,879 (why?)
Repository https://bitbucket.org/biojazzard/joomla-eboracast.git View Raw File View Project SPDX
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
<?php
/**
 * UCTC - The Unicode Transcoder
 *
 * Converts between various flavours of Unicode representations like UCS-4 or UTF-8
 * Supported schemes:
 * - UCS-4 Little Endian / Big Endian / Array (partially)
 * - UTF-16 Little Endian / Big Endian (not yet)
 * - UTF-8
 * - UTF-7
 * - UTF-7 IMAP (modified UTF-7)
 *
 * @package phlyMail Nahariya 4.0+ Default branch
 * @author Matthias Sommerfeld  <mso@phlyLabs.de>
 * @copyright 2003-2009 phlyLabs Berlin, http://phlylabs.de
 * @version 0.0.6 2009-05-10
 */
class uctc {
    private static $mechs = array('ucs4', /*'ucs4le', 'ucs4be', */'ucs4array', /*'utf16', 'utf16le', 'utf16be', */'utf8', 'utf7', 'utf7imap');
    private static $allow_overlong = false;
    private static $safe_mode;
    private static $safe_char;

    /**
     * The actual conversion routine
     *
     * @param mixed $data  The data to convert, usually a string, array when converting from UCS-4 array
     * @param string $from  Original encoding of the data
     * @param string $to  Target encoding of the data
     * @param bool $safe_mode  SafeMode tries to correct invalid codepoints
     * @return mixed  False on failure, String or array on success, depending on target encoding
     * @access public
     * @since 0.0.1
     */
    public static function convert($data, $from, $to, $safe_mode = false, $safe_char = 0xFFFC)
    {
        self::$safe_mode = ($safe_mode) ? true : false;
        self::$safe_char = ($safe_char) ? $safe_char : 0xFFFC;
        if (self::$safe_mode) self::$allow_overlong = true;
        if (!in_array($from, self::$mechs)) throw new Exception('Invalid input format specified');
        if (!in_array($to, self::$mechs)) throw new Exception('Invalid output format specified');
        if ($from != 'ucs4array') eval('$data = self::'.$from.'_ucs4array($data);');
        if ($to != 'ucs4array') eval('$data = self::ucs4array_'.$to.'($data);');
        return $data;
    }

    /**
     * This converts an UTF-8 encoded string to its UCS-4 representation
     *
     * @param string $input  The UTF-8 string to convert
     * @return array  Array of 32bit values representing each codepoint
     * @access private
     */
    private static function utf8_ucs4array($input)
    {
        $output = array();
        $out_len = 0;
        $inp_len = strlen($input);
        $mode = 'next';
        $test = 'none';
        for ($k = 0; $k < $inp_len; ++$k) {
            $v = ord($input{$k}); // Extract byte from input string

            if ($v < 128) { // We found an ASCII char - put into stirng as is
                $output[$out_len] = $v;
                ++$out_len;
                if ('add' == $mode) {
                    if (self::$safe_mode) {
                        $output[$out_len-2] = self::$safe_char;
                        $mode = 'next';
                    } else {
                        throw new Exception('Conversion from UTF-8 to UCS-4 failed: malformed input at byte '.$k);
                    }
                }
                continue;
            }
            if ('next' == $mode) { // Try to find the next start byte; determine the width of the Unicode char
                $start_byte = $v;
                $mode = 'add';
                $test = 'range';
                if ($v >> 5 == 6) { // &110xxxxx 10xxxxx
                    $next_byte = 0; // Tells, how many times subsequent bitmasks must rotate 6bits to the left
                    $v = ($v - 192) << 6;
                } elseif ($v >> 4 == 14) { // &1110xxxx 10xxxxxx 10xxxxxx
                    $next_byte = 1;
                    $v = ($v - 224) << 12;
                } elseif ($v >> 3 == 30) { // &11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
                    $next_byte = 2;
                    $v = ($v - 240) << 18;
                } elseif (self::$safe_mode) {
                    $mode = 'next';
                    $output[$out_len] = self::$safe_char;
                    ++$out_len;
                    continue;
                } else {
                    throw new Exception('This might be UTF-8, but I don\'t understand it at byte '.$k);
                }
                if ($inp_len-$k-$next_byte < 2) {
                    $output[$out_len] = self::$safe_char;
                    $mode = 'no';
                    continue;
                }

                if ('add' == $mode) {
                    $output[$out_len] = (int) $v;
                    ++$out_len;
                    continue;
                }
            }
            if ('add' == $mode) {
                if (!self::$allow_overlong && $test == 'range') {
                    $test = 'none';
                    if (($v < 0xA0 && $start_byte == 0xE0) || ($v < 0x90 && $start_byte == 0xF0) || ($v > 0x8F && $start_byte == 0xF4)) {
                        throw new Exception('Bogus UTF-8 character detected (out of legal range) at byte '.$k);
                    }
                }
                if ($v >> 6 == 2) { // Bit mask must be 10xxxxxx
                    $v = ($v-128) << ($next_byte*6);
                    $output[($out_len-1)] += $v;
                    --$next_byte;
                } else {
                    if (self::$safe_mode) {
                        $output[$out_len-1] = ord(self::$safe_char);
                        $k--;
                        $mode = 'next';
                        continue;
                    } else {
                        throw new Exception('Conversion from UTF-8 to UCS-4 failed: malformed input at byte '.$k);
                    }
                }
                if ($next_byte < 0) {
                    $mode = 'next';
                }
            }
        } // for
        return $output;
    }

    /**
     * Convert UCS-4 string into UTF-8 string
     * See utf8_ucs4array() for details
     * @access   private
     */
    private static function ucs4array_utf8($input)
    {
        $output = '';
        foreach ($input as $v) {
            if ($v < 128) { // 7bit are transferred literally
                $output .= chr($v);
            } elseif ($v < (1 << 11)) { // 2 bytes
                $output .= chr(192+($v >> 6)).chr(128+($v & 63));
            } elseif ($v < (1 << 16)) { // 3 bytes
                $output .= chr(224+($v >> 12)).chr(128+(($v >> 6) & 63)).chr(128+($v & 63));
            } elseif ($v < (1 << 21)) { // 4 bytes
                $output .= chr(240+($v >> 18)).chr(128+(($v >> 12) & 63)).chr(128+(($v >> 6) & 63)).chr(128+($v & 63));
            } elseif (self::$safe_mode) {
                $output .= self::$safe_char;
            } else {
                throw new Exception('Conversion from UCS-4 to UTF-8 failed: malformed input at byte '.$k);
            }
        }
        return $output;
    }

    private static function utf7imap_ucs4array($input)
    {
        return self::utf7_ucs4array(str_replace(',', '/', $input), '&');
    }

    private static function utf7_ucs4array($input, $sc = '+')
    {
        $output  = array();
        $out_len = 0;
        $inp_len = strlen($input);
        $mode    = 'd';
        $b64     = '';

        for ($k = 0; $k < $inp_len; ++$k) {
            $c = $input{$k};
            if (0 == ord($c)) continue; // Ignore zero bytes
            if ('b' == $mode) {
                // Sequence got terminated
                if (!preg_match('![A-Za-z0-9/'.preg_quote($sc, '!').']!', $c)) {
                    if ('-' == $c) {
                        if ($b64 == '') {
                            $output[$out_len] = ord($sc);
                            $out_len++;
                            $mode = 'd';
                            continue;
                        }
                    }
                    $tmp = base64_decode($b64);
                    $tmp = substr($tmp, -1 * (strlen($tmp) % 2));
                    for ($i = 0; $i < strlen($tmp); $i++) {
                        if ($i % 2) {
                            $output[$out_len] += ord($tmp{$i});
                            $out_len++;
                        } else {
                            $output[$out_len] = ord($tmp{$i}) << 8;
                        }
                    }
                    $mode = 'd';
                    $b64 = '';
                    continue;
                } else {
                    $b64 .= $c;
                }
            }
            if ('d' == $mode) {
                if ($sc == $c) {
                    $mode = 'b';
                    continue;
                }
                $output[$out_len] = ord($c);
                $out_len++;
            }
        }
        return $output;
    }

    private static function ucs4array_utf7imap($input)
    {
        return str_replace('/', ',', self::ucs4array_utf7($input, '&'));
    }

    private static function ucs4array_utf7($input, $sc = '+')
    {
        $output = '';
        $mode = 'd';
        $b64 = '';
        while (true) {
            $v = (!empty($input)) ? array_shift($input) : false;
            $is_direct = (false !== $v) ? (0x20 <= $v && $v <= 0x7e && $v != ord($sc)) : true;
            if ($mode == 'b') {
                if ($is_direct) {
                    if ($b64 == chr(0).$sc) {
                        $output .= $sc.'-';
                        $b64 = '';
                    } elseif ($b64) {
                        $output .= $sc.str_replace('=', '', base64_encode($b64)).'-';
                        $b64 = '';
                    }
                    $mode = 'd';
                } elseif (false !== $v) {
                    $b64 .= chr(($v >> 8) & 255). chr($v & 255);
                }
            }
            if ($mode == 'd' && false !== $v) {
                if ($is_direct) {
                    $output .= chr($v);
                } else {
                    $b64 = chr(($v >> 8) & 255). chr($v & 255);
                    $mode = 'b';
                }
            }
            if (false === $v && $b64 == '') break;
        }
        return $output;
    }

    /**
     * Convert UCS-4 array into UCS-4 string (Little Endian at the moment)
     * @access   private
     */
    private static function ucs4array_ucs4($input)
    {
        $output = '';
        foreach ($input as $v) {
            $output .= chr(($v >> 24) & 255).chr(($v >> 16) & 255).chr(($v >> 8) & 255).chr($v & 255);
        }
        return $output;
    }

    /**
     * Convert UCS-4 string (LE in the moment) into UCS-4 garray
     * @access   private
     */
    private static function ucs4_ucs4array($input)
    {
        $output = array();

        $inp_len = strlen($input);
        // Input length must be dividable by 4
        if ($inp_len % 4) {
            throw new Exception('Input UCS4 string is broken');
        }
        // Empty input - return empty output
        if (!$inp_len) return $output;

        for ($i = 0, $out_len = -1; $i < $inp_len; ++$i) {
            if (!($i % 4)) { // Increment output position every 4 input bytes
                $out_len++;
                $output[$out_len] = 0;
            }
            $output[$out_len] += ord($input{$i}) << (8 * (3 - ($i % 4) ) );
        }
        return $output;
    }
}
?>
Back to Top