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224 lines
9.5 KiB
224 lines
9.5 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;
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/**
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* @author Fabien Potencier <fabien@symfony.com>
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* @author Xavier De Cock <xdecock@gmail.com>
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*
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* @internal
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*
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* @experimental in 4.3
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*/
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final class CharacterStream
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{
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/** Pre-computed for optimization */
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private const UTF8_LENGTH_MAP = [
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"\x00" => 1, "\x01" => 1, "\x02" => 1, "\x03" => 1, "\x04" => 1, "\x05" => 1, "\x06" => 1, "\x07" => 1,
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"\x08" => 1, "\x09" => 1, "\x0a" => 1, "\x0b" => 1, "\x0c" => 1, "\x0d" => 1, "\x0e" => 1, "\x0f" => 1,
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"\x10" => 1, "\x11" => 1, "\x12" => 1, "\x13" => 1, "\x14" => 1, "\x15" => 1, "\x16" => 1, "\x17" => 1,
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"\x18" => 1, "\x19" => 1, "\x1a" => 1, "\x1b" => 1, "\x1c" => 1, "\x1d" => 1, "\x1e" => 1, "\x1f" => 1,
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"\x20" => 1, "\x21" => 1, "\x22" => 1, "\x23" => 1, "\x24" => 1, "\x25" => 1, "\x26" => 1, "\x27" => 1,
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"\x28" => 1, "\x29" => 1, "\x2a" => 1, "\x2b" => 1, "\x2c" => 1, "\x2d" => 1, "\x2e" => 1, "\x2f" => 1,
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"\x30" => 1, "\x31" => 1, "\x32" => 1, "\x33" => 1, "\x34" => 1, "\x35" => 1, "\x36" => 1, "\x37" => 1,
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"\x38" => 1, "\x39" => 1, "\x3a" => 1, "\x3b" => 1, "\x3c" => 1, "\x3d" => 1, "\x3e" => 1, "\x3f" => 1,
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"\x40" => 1, "\x41" => 1, "\x42" => 1, "\x43" => 1, "\x44" => 1, "\x45" => 1, "\x46" => 1, "\x47" => 1,
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"\x48" => 1, "\x49" => 1, "\x4a" => 1, "\x4b" => 1, "\x4c" => 1, "\x4d" => 1, "\x4e" => 1, "\x4f" => 1,
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"\x50" => 1, "\x51" => 1, "\x52" => 1, "\x53" => 1, "\x54" => 1, "\x55" => 1, "\x56" => 1, "\x57" => 1,
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"\x58" => 1, "\x59" => 1, "\x5a" => 1, "\x5b" => 1, "\x5c" => 1, "\x5d" => 1, "\x5e" => 1, "\x5f" => 1,
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"\x60" => 1, "\x61" => 1, "\x62" => 1, "\x63" => 1, "\x64" => 1, "\x65" => 1, "\x66" => 1, "\x67" => 1,
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"\x68" => 1, "\x69" => 1, "\x6a" => 1, "\x6b" => 1, "\x6c" => 1, "\x6d" => 1, "\x6e" => 1, "\x6f" => 1,
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"\x70" => 1, "\x71" => 1, "\x72" => 1, "\x73" => 1, "\x74" => 1, "\x75" => 1, "\x76" => 1, "\x77" => 1,
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"\x78" => 1, "\x79" => 1, "\x7a" => 1, "\x7b" => 1, "\x7c" => 1, "\x7d" => 1, "\x7e" => 1, "\x7f" => 1,
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"\x80" => 0, "\x81" => 0, "\x82" => 0, "\x83" => 0, "\x84" => 0, "\x85" => 0, "\x86" => 0, "\x87" => 0,
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"\x88" => 0, "\x89" => 0, "\x8a" => 0, "\x8b" => 0, "\x8c" => 0, "\x8d" => 0, "\x8e" => 0, "\x8f" => 0,
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"\x90" => 0, "\x91" => 0, "\x92" => 0, "\x93" => 0, "\x94" => 0, "\x95" => 0, "\x96" => 0, "\x97" => 0,
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"\x98" => 0, "\x99" => 0, "\x9a" => 0, "\x9b" => 0, "\x9c" => 0, "\x9d" => 0, "\x9e" => 0, "\x9f" => 0,
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"\xa0" => 0, "\xa1" => 0, "\xa2" => 0, "\xa3" => 0, "\xa4" => 0, "\xa5" => 0, "\xa6" => 0, "\xa7" => 0,
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"\xa8" => 0, "\xa9" => 0, "\xaa" => 0, "\xab" => 0, "\xac" => 0, "\xad" => 0, "\xae" => 0, "\xaf" => 0,
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"\xb0" => 0, "\xb1" => 0, "\xb2" => 0, "\xb3" => 0, "\xb4" => 0, "\xb5" => 0, "\xb6" => 0, "\xb7" => 0,
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"\xb8" => 0, "\xb9" => 0, "\xba" => 0, "\xbb" => 0, "\xbc" => 0, "\xbd" => 0, "\xbe" => 0, "\xbf" => 0,
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"\xc0" => 2, "\xc1" => 2, "\xc2" => 2, "\xc3" => 2, "\xc4" => 2, "\xc5" => 2, "\xc6" => 2, "\xc7" => 2,
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"\xc8" => 2, "\xc9" => 2, "\xca" => 2, "\xcb" => 2, "\xcc" => 2, "\xcd" => 2, "\xce" => 2, "\xcf" => 2,
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"\xd0" => 2, "\xd1" => 2, "\xd2" => 2, "\xd3" => 2, "\xd4" => 2, "\xd5" => 2, "\xd6" => 2, "\xd7" => 2,
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"\xd8" => 2, "\xd9" => 2, "\xda" => 2, "\xdb" => 2, "\xdc" => 2, "\xdd" => 2, "\xde" => 2, "\xdf" => 2,
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"\xe0" => 3, "\xe1" => 3, "\xe2" => 3, "\xe3" => 3, "\xe4" => 3, "\xe5" => 3, "\xe6" => 3, "\xe7" => 3,
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"\xe8" => 3, "\xe9" => 3, "\xea" => 3, "\xeb" => 3, "\xec" => 3, "\xed" => 3, "\xee" => 3, "\xef" => 3,
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"\xf0" => 4, "\xf1" => 4, "\xf2" => 4, "\xf3" => 4, "\xf4" => 4, "\xf5" => 4, "\xf6" => 4, "\xf7" => 4,
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"\xf8" => 5, "\xf9" => 5, "\xfa" => 5, "\xfb" => 5, "\xfc" => 6, "\xfd" => 6, "\xfe" => 0, "\xff" => 0,
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];
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private $data = '';
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private $dataSize = 0;
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private $map = [];
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private $charCount = 0;
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private $currentPos = 0;
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private $fixedWidth = 0;
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/**
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* @param resource|string $input
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*/
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public function __construct($input, ?string $charset = 'utf-8')
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{
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$charset = strtolower(trim($charset)) ?: 'utf-8';
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if ('utf-8' === $charset || 'utf8' === $charset) {
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$this->fixedWidth = 0;
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$this->map = ['p' => [], 'i' => []];
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} else {
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switch ($charset) {
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// 16 bits
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case 'ucs2':
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case 'ucs-2':
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case 'utf16':
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case 'utf-16':
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$this->fixedWidth = 2;
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break;
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// 32 bits
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case 'ucs4':
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case 'ucs-4':
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case 'utf32':
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case 'utf-32':
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$this->fixedWidth = 4;
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break;
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// 7-8 bit charsets: (us-)?ascii, (iso|iec)-?8859-?[0-9]+, windows-?125[0-9], cp-?[0-9]+, ansi, macintosh,
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// koi-?7, koi-?8-?.+, mik, (cork|t1), v?iscii
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// and fallback
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default:
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$this->fixedWidth = 1;
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}
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}
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if (\is_resource($input)) {
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$blocks = 512;
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if (stream_get_meta_data($input)['seekable'] ?? false) {
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rewind($input);
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}
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while (false !== $read = fread($input, $blocks)) {
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$this->write($read);
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}
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} else {
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$this->write($input);
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}
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}
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public function read(int $length): ?string
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{
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if ($this->currentPos >= $this->charCount) {
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return null;
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}
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$ret = null;
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$length = ($this->currentPos + $length > $this->charCount) ? $this->charCount - $this->currentPos : $length;
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if ($this->fixedWidth > 0) {
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$len = $length * $this->fixedWidth;
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$ret = substr($this->data, $this->currentPos * $this->fixedWidth, $len);
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$this->currentPos += $length;
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} else {
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$end = $this->currentPos + $length;
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$end = $end > $this->charCount ? $this->charCount : $end;
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$ret = '';
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$start = 0;
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if ($this->currentPos > 0) {
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$start = $this->map['p'][$this->currentPos - 1];
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}
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$to = $start;
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for (; $this->currentPos < $end; ++$this->currentPos) {
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if (isset($this->map['i'][$this->currentPos])) {
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$ret .= substr($this->data, $start, $to - $start).'?';
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$start = $this->map['p'][$this->currentPos];
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} else {
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$to = $this->map['p'][$this->currentPos];
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}
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}
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$ret .= substr($this->data, $start, $to - $start);
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}
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return $ret;
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}
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public function readBytes(int $length): ?array
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{
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if (null !== $read = $this->read($length)) {
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return array_map('ord', str_split($read, 1));
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}
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return null;
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}
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public function setPointer(int $charOffset): void
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{
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if ($this->charCount < $charOffset) {
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$charOffset = $this->charCount;
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}
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$this->currentPos = $charOffset;
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}
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public function write(string $chars): void
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{
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$ignored = '';
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$this->data .= $chars;
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if ($this->fixedWidth > 0) {
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$strlen = \strlen($chars);
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$ignoredL = $strlen % $this->fixedWidth;
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$ignored = $ignoredL ? substr($chars, -$ignoredL) : '';
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$this->charCount += ($strlen - $ignoredL) / $this->fixedWidth;
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} else {
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$this->charCount += $this->getUtf8CharPositions($chars, $this->dataSize, $ignored);
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}
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$this->dataSize = \strlen($this->data) - \strlen($ignored);
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}
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private function getUtf8CharPositions(string $string, int $startOffset, &$ignoredChars): int
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{
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$strlen = \strlen($string);
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$charPos = \count($this->map['p']);
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$foundChars = 0;
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$invalid = false;
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for ($i = 0; $i < $strlen; ++$i) {
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$char = $string[$i];
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$size = self::UTF8_LENGTH_MAP[$char];
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if (0 == $size) {
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/* char is invalid, we must wait for a resync */
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$invalid = true;
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continue;
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}
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if ($invalid) {
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/* We mark the chars as invalid and start a new char */
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$this->map['p'][$charPos + $foundChars] = $startOffset + $i;
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$this->map['i'][$charPos + $foundChars] = true;
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++$foundChars;
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$invalid = false;
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}
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if (($i + $size) > $strlen) {
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$ignoredChars = substr($string, $i);
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break;
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}
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for ($j = 1; $j < $size; ++$j) {
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$char = $string[$i + $j];
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if ($char > "\x7F" && $char < "\xC0") {
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// Valid - continue parsing
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} else {
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/* char is invalid, we must wait for a resync */
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$invalid = true;
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continue 2;
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}
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}
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/* Ok we got a complete char here */
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$this->map['p'][$charPos + $foundChars] = $startOffset + $i + $size;
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$i += $j - 1;
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++$foundChars;
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}
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return $foundChars;
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}
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}
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