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<?php |
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/** |
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* This file is part of the sj-i/php-profiler package. |
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* |
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* (c) sji <[email protected]> |
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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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declare(strict_types=1); |
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namespace PhpProfiler\Lib\ByteStream; |
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use OutOfBoundsException; |
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use PhpProfiler\Lib\Process\MemoryMap\ProcessModuleMemoryMapInterface; |
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use PhpProfiler\Lib\Process\MemoryReader\MemoryReaderInterface; |
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use function chr; |
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use function max; |
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final class ProcessMemoryByteReader implements ByteReaderInterface |
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{ |
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use ByteReaderDisableWriteAccessTrait; |
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private const PAGE_SIZE = 8192; |
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/** @var CDataByteReader[] */ |
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private array $pages = []; |
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public function __construct( |
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private MemoryReaderInterface $memory_reader, |
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private int $pid, |
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private ProcessModuleMemoryMapInterface $memory_map |
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) { |
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} |
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public function offsetExists($offset): bool |
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{ |
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return $this->memory_map->isInRange($offset); |
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} |
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public function offsetGet($offset): int |
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{ |
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if (!isset($this[$offset])) { |
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throw new OutOfBoundsException(); |
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} |
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$base_address = $this->memory_map->getBaseAddress(); |
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$page = (int)($offset / self::PAGE_SIZE); |
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$page_block = $this->locatePage($page, $base_address); |
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$diff = 0; |
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if ($page * self::PAGE_SIZE < $base_address) { |
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$diff = $base_address - $page * self::PAGE_SIZE; |
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} |
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return $page_block[($offset % self::PAGE_SIZE) - $diff]; |
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} |
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private function locatePage(int $page, int $base_address): CDataByteReader |
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{ |
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if (!isset($this->pages[$page])) { |
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$this->pages[$page] = new CDataByteReader( |
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$this->memory_reader->read( |
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$this->pid, |
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max($base_address, $page * self::PAGE_SIZE), |
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self::PAGE_SIZE |
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) |
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); |
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} |
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return $this->pages[$page]; |
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} |
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public function createSliceAsString(int $offset, int $size): string |
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{ |
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$result = ''; |
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for ($i = $offset; $i < ($offset + $size); $i++) { |
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$result .= chr($this[$i]); |
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} |
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return $result; |
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} |
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} |
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sj-i /
php-profiler
