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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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namespace PhpProfiler\Lib\Binary; |
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use PhpProfiler\Lib\Process\MemoryMap\ProcessMemoryArea; |
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use PhpProfiler\Lib\Process\MemoryReader\MemoryReaderInterface; |
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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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private MemoryReaderInterface $memory_reader; |
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/** @var CDataByteReader[] */ |
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private array $pages = []; |
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private int $pid; |
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/** @var ProcessMemoryArea[] */ |
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private array $memory_area; |
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private bool $is_address = false; |
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/** |
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* ProcessMemoryByteReader constructor. |
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* @param MemoryReaderInterface $memory_reader |
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* @param int $pid |
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* @param ProcessMemoryArea[] $memory_area |
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*/ |
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public function __construct(MemoryReaderInterface $memory_reader, int $pid, array $memory_area) |
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{ |
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$this->memory_reader = $memory_reader; |
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$this->pid = $pid; |
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$this->memory_area = $memory_area; |
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} |
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public function offsetExists($offset): bool |
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{ |
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return true; |
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} |
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public function useMemoryAddress(bool $is_address): void |
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{ |
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$this->is_address = $is_address; |
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} |
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public function getBegin(): int |
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{ |
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$begin = PHP_INT_MAX; |
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foreach ($this->memory_area as $memory_area) { |
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$begin = min($begin, hexdec($memory_area->begin)); |
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} |
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return $begin; |
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} |
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public function offsetGet($offset): int |
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{ |
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if (!$this->is_address) { |
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$offset = $this->getMemoryAddressFromOffset($offset); |
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} |
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$page = (int)floor($offset / self::PAGE_SIZE); |
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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($this->getBegin(), $page * self::PAGE_SIZE), |
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self::PAGE_SIZE |
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) |
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); |
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} |
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$diff = 0; |
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if ($page * self::PAGE_SIZE < $this->getBegin()) { |
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$diff = $this->getBegin() - $page * self::PAGE_SIZE; |
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} |
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return $this->pages[$page][($offset % self::PAGE_SIZE) - $diff]; |
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} |
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private function getMemoryAddressFromOffset(int $offset): int |
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{ |
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$ranges = []; |
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foreach ($this->memory_area as $memory_area) { |
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$ranges[hexdec($memory_area->file_offset)] = hexdec($memory_area->begin); |
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} |
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ksort($ranges); |
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$file_offset_decided = 0; |
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foreach ($ranges as $file_offset => $memory_begin) { |
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if ($file_offset <= $offset) { |
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$file_offset_decided = $file_offset; |
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} |
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} |
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return $ranges[$file_offset_decided] + ($offset - $file_offset_decided); |
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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
