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195 lines
7.7 KiB
195 lines
7.7 KiB
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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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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namespace Symfony\Component\Mime\Encoder;
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use Symfony\Component\Mime\CharacterStream;
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/**
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* @author Chris Corbyn
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*/
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class QpEncoder implements EncoderInterface
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{
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/**
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* Pre-computed QP for HUGE optimization.
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*/
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private const QP_MAP = [
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0 => '=00', 1 => '=01', 2 => '=02', 3 => '=03', 4 => '=04',
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5 => '=05', 6 => '=06', 7 => '=07', 8 => '=08', 9 => '=09',
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10 => '=0A', 11 => '=0B', 12 => '=0C', 13 => '=0D', 14 => '=0E',
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15 => '=0F', 16 => '=10', 17 => '=11', 18 => '=12', 19 => '=13',
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20 => '=14', 21 => '=15', 22 => '=16', 23 => '=17', 24 => '=18',
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25 => '=19', 26 => '=1A', 27 => '=1B', 28 => '=1C', 29 => '=1D',
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30 => '=1E', 31 => '=1F', 32 => '=20', 33 => '=21', 34 => '=22',
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35 => '=23', 36 => '=24', 37 => '=25', 38 => '=26', 39 => '=27',
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40 => '=28', 41 => '=29', 42 => '=2A', 43 => '=2B', 44 => '=2C',
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45 => '=2D', 46 => '=2E', 47 => '=2F', 48 => '=30', 49 => '=31',
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50 => '=32', 51 => '=33', 52 => '=34', 53 => '=35', 54 => '=36',
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55 => '=37', 56 => '=38', 57 => '=39', 58 => '=3A', 59 => '=3B',
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60 => '=3C', 61 => '=3D', 62 => '=3E', 63 => '=3F', 64 => '=40',
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65 => '=41', 66 => '=42', 67 => '=43', 68 => '=44', 69 => '=45',
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70 => '=46', 71 => '=47', 72 => '=48', 73 => '=49', 74 => '=4A',
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75 => '=4B', 76 => '=4C', 77 => '=4D', 78 => '=4E', 79 => '=4F',
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80 => '=50', 81 => '=51', 82 => '=52', 83 => '=53', 84 => '=54',
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85 => '=55', 86 => '=56', 87 => '=57', 88 => '=58', 89 => '=59',
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90 => '=5A', 91 => '=5B', 92 => '=5C', 93 => '=5D', 94 => '=5E',
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95 => '=5F', 96 => '=60', 97 => '=61', 98 => '=62', 99 => '=63',
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100 => '=64', 101 => '=65', 102 => '=66', 103 => '=67', 104 => '=68',
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105 => '=69', 106 => '=6A', 107 => '=6B', 108 => '=6C', 109 => '=6D',
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110 => '=6E', 111 => '=6F', 112 => '=70', 113 => '=71', 114 => '=72',
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115 => '=73', 116 => '=74', 117 => '=75', 118 => '=76', 119 => '=77',
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120 => '=78', 121 => '=79', 122 => '=7A', 123 => '=7B', 124 => '=7C',
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125 => '=7D', 126 => '=7E', 127 => '=7F', 128 => '=80', 129 => '=81',
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130 => '=82', 131 => '=83', 132 => '=84', 133 => '=85', 134 => '=86',
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135 => '=87', 136 => '=88', 137 => '=89', 138 => '=8A', 139 => '=8B',
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140 => '=8C', 141 => '=8D', 142 => '=8E', 143 => '=8F', 144 => '=90',
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145 => '=91', 146 => '=92', 147 => '=93', 148 => '=94', 149 => '=95',
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150 => '=96', 151 => '=97', 152 => '=98', 153 => '=99', 154 => '=9A',
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155 => '=9B', 156 => '=9C', 157 => '=9D', 158 => '=9E', 159 => '=9F',
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160 => '=A0', 161 => '=A1', 162 => '=A2', 163 => '=A3', 164 => '=A4',
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165 => '=A5', 166 => '=A6', 167 => '=A7', 168 => '=A8', 169 => '=A9',
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170 => '=AA', 171 => '=AB', 172 => '=AC', 173 => '=AD', 174 => '=AE',
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175 => '=AF', 176 => '=B0', 177 => '=B1', 178 => '=B2', 179 => '=B3',
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180 => '=B4', 181 => '=B5', 182 => '=B6', 183 => '=B7', 184 => '=B8',
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185 => '=B9', 186 => '=BA', 187 => '=BB', 188 => '=BC', 189 => '=BD',
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190 => '=BE', 191 => '=BF', 192 => '=C0', 193 => '=C1', 194 => '=C2',
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195 => '=C3', 196 => '=C4', 197 => '=C5', 198 => '=C6', 199 => '=C7',
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200 => '=C8', 201 => '=C9', 202 => '=CA', 203 => '=CB', 204 => '=CC',
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205 => '=CD', 206 => '=CE', 207 => '=CF', 208 => '=D0', 209 => '=D1',
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210 => '=D2', 211 => '=D3', 212 => '=D4', 213 => '=D5', 214 => '=D6',
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215 => '=D7', 216 => '=D8', 217 => '=D9', 218 => '=DA', 219 => '=DB',
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220 => '=DC', 221 => '=DD', 222 => '=DE', 223 => '=DF', 224 => '=E0',
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225 => '=E1', 226 => '=E2', 227 => '=E3', 228 => '=E4', 229 => '=E5',
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230 => '=E6', 231 => '=E7', 232 => '=E8', 233 => '=E9', 234 => '=EA',
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235 => '=EB', 236 => '=EC', 237 => '=ED', 238 => '=EE', 239 => '=EF',
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240 => '=F0', 241 => '=F1', 242 => '=F2', 243 => '=F3', 244 => '=F4',
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245 => '=F5', 246 => '=F6', 247 => '=F7', 248 => '=F8', 249 => '=F9',
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250 => '=FA', 251 => '=FB', 252 => '=FC', 253 => '=FD', 254 => '=FE',
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255 => '=FF',
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];
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private static $safeMapShare = [];
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/**
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* A map of non-encoded ascii characters.
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*
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* @var string[]
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*
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* @internal
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*/
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protected $safeMap = [];
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public function __construct()
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{
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$id = static::class;
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if (!isset(self::$safeMapShare[$id])) {
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$this->initSafeMap();
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self::$safeMapShare[$id] = $this->safeMap;
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} else {
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$this->safeMap = self::$safeMapShare[$id];
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}
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}
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protected function initSafeMap(): void
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{
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foreach (array_merge([0x09, 0x20], range(0x21, 0x3C), range(0x3E, 0x7E)) as $byte) {
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$this->safeMap[$byte] = \chr($byte);
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}
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}
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/**
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* {@inheritdoc}
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*
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* Takes an unencoded string and produces a QP encoded string from it.
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*
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* QP encoded strings have a maximum line length of 76 characters.
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* If the first line needs to be shorter, indicate the difference with
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* $firstLineOffset.
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*/
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public function encodeString(string $string, ?string $charset = 'utf-8', int $firstLineOffset = 0, int $maxLineLength = 0): string
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{
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if ($maxLineLength > 76 || $maxLineLength <= 0) {
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$maxLineLength = 76;
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}
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$thisLineLength = $maxLineLength - $firstLineOffset;
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$lines = [];
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$lNo = 0;
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$lines[$lNo] = '';
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$currentLine = &$lines[$lNo++];
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$size = $lineLen = 0;
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$charStream = new CharacterStream($string, $charset);
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// Fetching more than 4 chars at one is slower, as is fetching fewer bytes
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// Conveniently 4 chars is the UTF-8 safe number since UTF-8 has up to 6
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// bytes per char and (6 * 4 * 3 = 72 chars per line) * =NN is 3 bytes
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while (null !== $bytes = $charStream->readBytes(4)) {
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$enc = $this->encodeByteSequence($bytes, $size);
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$i = strpos($enc, '=0D=0A');
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$newLineLength = $lineLen + (false === $i ? $size : $i);
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if ($currentLine && $newLineLength >= $thisLineLength) {
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$lines[$lNo] = '';
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$currentLine = &$lines[$lNo++];
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$thisLineLength = $maxLineLength;
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$lineLen = 0;
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}
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$currentLine .= $enc;
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if (false === $i) {
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$lineLen += $size;
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} else {
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// 6 is the length of '=0D=0A'.
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$lineLen = $size - strrpos($enc, '=0D=0A') - 6;
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}
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}
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return $this->standardize(implode("=\r\n", $lines));
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}
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/**
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* Encode the given byte array into a verbatim QP form.
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*/
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private function encodeByteSequence(array $bytes, int &$size): string
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{
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$ret = '';
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$size = 0;
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foreach ($bytes as $b) {
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if (isset($this->safeMap[$b])) {
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$ret .= $this->safeMap[$b];
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++$size;
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} else {
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$ret .= self::QP_MAP[$b];
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$size += 3;
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}
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}
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return $ret;
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}
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/**
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* Make sure CRLF is correct and HT/SPACE are in valid places.
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*/
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private function standardize(string $string): string
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{
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$string = str_replace(["\t=0D=0A", ' =0D=0A', '=0D=0A'], ["=09\r\n", "=20\r\n", "\r\n"], $string);
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switch ($end = \ord(substr($string, -1))) {
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case 0x09:
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case 0x20:
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$string = substr_replace($string, self::QP_MAP[$end], -1);
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}
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return $string;
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}
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}
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