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File Name : QpEncoder.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Mime\Encoder;

use Symfony\Component\Mime\CharacterStream;

/**
 * @author Chris Corbyn
 */
class QpEncoder implements EncoderInterface
{
    /**
     * Pre-computed QP for HUGE optimization.
     */
    private const QP_MAP = [
        0 => '=00', 1 => '=01', 2 => '=02', 3 => '=03', 4 => '=04',
        5 => '=05', 6 => '=06', 7 => '=07', 8 => '=08', 9 => '=09',
        10 => '=0A', 11 => '=0B', 12 => '=0C', 13 => '=0D', 14 => '=0E',
        15 => '=0F', 16 => '=10', 17 => '=11', 18 => '=12', 19 => '=13',
        20 => '=14', 21 => '=15', 22 => '=16', 23 => '=17', 24 => '=18',
        25 => '=19', 26 => '=1A', 27 => '=1B', 28 => '=1C', 29 => '=1D',
        30 => '=1E', 31 => '=1F', 32 => '=20', 33 => '=21', 34 => '=22',
        35 => '=23', 36 => '=24', 37 => '=25', 38 => '=26', 39 => '=27',
        40 => '=28', 41 => '=29', 42 => '=2A', 43 => '=2B', 44 => '=2C',
        45 => '=2D', 46 => '=2E', 47 => '=2F', 48 => '=30', 49 => '=31',
        50 => '=32', 51 => '=33', 52 => '=34', 53 => '=35', 54 => '=36',
        55 => '=37', 56 => '=38', 57 => '=39', 58 => '=3A', 59 => '=3B',
        60 => '=3C', 61 => '=3D', 62 => '=3E', 63 => '=3F', 64 => '=40',
        65 => '=41', 66 => '=42', 67 => '=43', 68 => '=44', 69 => '=45',
        70 => '=46', 71 => '=47', 72 => '=48', 73 => '=49', 74 => '=4A',
        75 => '=4B', 76 => '=4C', 77 => '=4D', 78 => '=4E', 79 => '=4F',
        80 => '=50', 81 => '=51', 82 => '=52', 83 => '=53', 84 => '=54',
        85 => '=55', 86 => '=56', 87 => '=57', 88 => '=58', 89 => '=59',
        90 => '=5A', 91 => '=5B', 92 => '=5C', 93 => '=5D', 94 => '=5E',
        95 => '=5F', 96 => '=60', 97 => '=61', 98 => '=62', 99 => '=63',
        100 => '=64', 101 => '=65', 102 => '=66', 103 => '=67', 104 => '=68',
        105 => '=69', 106 => '=6A', 107 => '=6B', 108 => '=6C', 109 => '=6D',
        110 => '=6E', 111 => '=6F', 112 => '=70', 113 => '=71', 114 => '=72',
        115 => '=73', 116 => '=74', 117 => '=75', 118 => '=76', 119 => '=77',
        120 => '=78', 121 => '=79', 122 => '=7A', 123 => '=7B', 124 => '=7C',
        125 => '=7D', 126 => '=7E', 127 => '=7F', 128 => '=80', 129 => '=81',
        130 => '=82', 131 => '=83', 132 => '=84', 133 => '=85', 134 => '=86',
        135 => '=87', 136 => '=88', 137 => '=89', 138 => '=8A', 139 => '=8B',
        140 => '=8C', 141 => '=8D', 142 => '=8E', 143 => '=8F', 144 => '=90',
        145 => '=91', 146 => '=92', 147 => '=93', 148 => '=94', 149 => '=95',
        150 => '=96', 151 => '=97', 152 => '=98', 153 => '=99', 154 => '=9A',
        155 => '=9B', 156 => '=9C', 157 => '=9D', 158 => '=9E', 159 => '=9F',
        160 => '=A0', 161 => '=A1', 162 => '=A2', 163 => '=A3', 164 => '=A4',
        165 => '=A5', 166 => '=A6', 167 => '=A7', 168 => '=A8', 169 => '=A9',
        170 => '=AA', 171 => '=AB', 172 => '=AC', 173 => '=AD', 174 => '=AE',
        175 => '=AF', 176 => '=B0', 177 => '=B1', 178 => '=B2', 179 => '=B3',
        180 => '=B4', 181 => '=B5', 182 => '=B6', 183 => '=B7', 184 => '=B8',
        185 => '=B9', 186 => '=BA', 187 => '=BB', 188 => '=BC', 189 => '=BD',
        190 => '=BE', 191 => '=BF', 192 => '=C0', 193 => '=C1', 194 => '=C2',
        195 => '=C3', 196 => '=C4', 197 => '=C5', 198 => '=C6', 199 => '=C7',
        200 => '=C8', 201 => '=C9', 202 => '=CA', 203 => '=CB', 204 => '=CC',
        205 => '=CD', 206 => '=CE', 207 => '=CF', 208 => '=D0', 209 => '=D1',
        210 => '=D2', 211 => '=D3', 212 => '=D4', 213 => '=D5', 214 => '=D6',
        215 => '=D7', 216 => '=D8', 217 => '=D9', 218 => '=DA', 219 => '=DB',
        220 => '=DC', 221 => '=DD', 222 => '=DE', 223 => '=DF', 224 => '=E0',
        225 => '=E1', 226 => '=E2', 227 => '=E3', 228 => '=E4', 229 => '=E5',
        230 => '=E6', 231 => '=E7', 232 => '=E8', 233 => '=E9', 234 => '=EA',
        235 => '=EB', 236 => '=EC', 237 => '=ED', 238 => '=EE', 239 => '=EF',
        240 => '=F0', 241 => '=F1', 242 => '=F2', 243 => '=F3', 244 => '=F4',
        245 => '=F5', 246 => '=F6', 247 => '=F7', 248 => '=F8', 249 => '=F9',
        250 => '=FA', 251 => '=FB', 252 => '=FC', 253 => '=FD', 254 => '=FE',
        255 => '=FF',
    ];

private static array $safeMapShare = [];

/**
     * A map of non-encoded ascii characters.
     *
     * @var string[]
     *
     * @internal
     */
    protected array $safeMap = [];

public function __construct()
    {
        $id = static::class;
        if (!isset(self::$safeMapShare[$id])) {
            $this->initSafeMap();
            self::$safeMapShare[$id] = $this->safeMap;
        } else {
            $this->safeMap = self::$safeMapShare[$id];
        }
    }

protected function initSafeMap(): void
    {
        foreach (array_merge([0x09, 0x20], range(0x21, 0x3C), range(0x3E, 0x7E)) as $byte) {
            $this->safeMap[$byte] = \chr($byte);
        }
    }

/**
     * Takes an unencoded string and produces a QP encoded string from it.
     *
     * QP encoded strings have a maximum line length of 76 characters.
     * If the first line needs to be shorter, indicate the difference with
     * $firstLineOffset.
     */
    public function encodeString(string $string, ?string $charset = 'utf-8', int $firstLineOffset = 0, int $maxLineLength = 0): string
    {
        if ($maxLineLength > 76 || $maxLineLength <= 0) {
            $maxLineLength = 76;
        }

$thisLineLength = $maxLineLength - $firstLineOffset;

$lines = [];
        $lNo = 0;
        $lines[$lNo] = '';
        $currentLine = &$lines[$lNo++];
        $size = $lineLen = 0;
        $charStream = new CharacterStream($string, $charset);

// Fetching more than 4 chars at one is slower, as is fetching fewer bytes
        // Conveniently 4 chars is the UTF-8 safe number since UTF-8 has up to 6
        // bytes per char and (6 * 4 * 3 = 72 chars per line) * =NN is 3 bytes
        while (null !== $bytes = $charStream->readBytes(4)) {
            $enc = $this->encodeByteSequence($bytes, $size);

$i = strpos($enc, '=0D=0A');
            $newLineLength = $lineLen + (false === $i ? $size : $i);

if ($currentLine && $newLineLength >= $thisLineLength) {
                $lines[$lNo] = '';
                $currentLine = &$lines[$lNo++];
                $thisLineLength = $maxLineLength;
                $lineLen = 0;
            }

$currentLine .= $enc;

if (false === $i) {
                $lineLen += $size;
            } else {
                // 6 is the length of '=0D=0A'.
                $lineLen = $size - strrpos($enc, '=0D=0A') - 6;
            }
        }

return $this->standardize(implode("=\r\n", $lines));
    }

/**
     * Encode the given byte array into a verbatim QP form.
     */
    private function encodeByteSequence(array $bytes, int &$size): string
    {
        $ret = '';
        $size = 0;
        foreach ($bytes as $b) {
            if (isset($this->safeMap[$b])) {
                $ret .= $this->safeMap[$b];
                ++$size;
            } else {
                $ret .= self::QP_MAP[$b];
                $size += 3;
            }
        }

return $ret;
    }

/**
     * Make sure CRLF is correct and HT/SPACE are in valid places.
     */
    private function standardize(string $string): string
    {
        $string = str_replace(["\t=0D=0A", ' =0D=0A', '=0D=0A'], ["=09\r\n", "=20\r\n", "\r\n"], $string);

return match ($end = \ord(substr($string, -1))) {
            0x09,
            0x20 => substr_replace($string, self::QP_MAP[$end], -1),
            default => $string,
        };
    }
}

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	forge/forge	0775	2024-01-30 08:32:12
..	dir	-	forge/forge	0775	2024-01-30 08:32:12
AddressEncoderInterface.php	text/x-php	689 B	forge/forge	0664	2024-01-30 08:32:12
Base64ContentEncoder.php	text/x-php	1.3 KB	forge/forge	0664	2024-01-30 08:32:12
Base64Encoder.php	text/x-php	1.25 KB	forge/forge	0664	2024-01-30 08:32:12
Base64MimeHeaderEncoder.php	text/x-php	1.26 KB	forge/forge	0664	2024-01-30 08:32:12
ContentEncoderInterface.php	text/x-php	668 B	forge/forge	0664	2024-01-30 08:32:12
EightBitContentEncoder.php	text/x-php	834 B	forge/forge	0664	2024-01-30 08:32:12
EncoderInterface.php	text/x-php	717 B	forge/forge	0664	2024-01-30 08:32:12
IdnAddressEncoder.php	text/x-php	1.28 KB	forge/forge	0664	2024-01-30 08:32:12
MimeHeaderEncoderInterface.php	text/x-php	467 B	forge/forge	0664	2024-01-30 08:32:12
QpContentEncoder.php	text/x-php	1.69 KB	forge/forge	0664	2024-01-30 08:32:12
QpEncoder.php	text/x-php	7.67 KB	forge/forge	0664	2024-01-30 08:32:12
QpMimeHeaderEncoder.php	text/x-php	1.05 KB	forge/forge	0664	2024-01-30 08:32:12
Rfc2231Encoder.php	text/x-php	1.4 KB	forge/forge	0664	2024-01-30 08:32:12

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