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<?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\Process\Pipes;

use Symfony\Component\Process\Process;
use Symfony\Component\Process\Exception\RuntimeException;

/**
 * WindowsPipes implementation uses temporary files as handles.
 *
 * @see https://bugs.php.net/bug.php?id=51800
 * @see https://bugs.php.net/bug.php?id=65650
 *
 * @author Romain Neutron <imprec@gmail.com>
 *
 * @internal
 */
class WindowsPipes extends AbstractPipes
{
    /** @var array */
    private $files = array();
    /** @var array */
    private $fileHandles = array();
    /** @var array */
    private $readBytes = array(
        Process::STDOUT => 0,
        Process::STDERR => 0,
    );
    /** @var bool */
    private $haveReadSupport;

    public function __construct($input, $haveReadSupport)
    {
        $this->haveReadSupport = (bool) $haveReadSupport;

        if ($this->haveReadSupport) {
            // Fix for PHP bug #51800: reading from STDOUT pipe hangs forever on Windows if the output is too big.
            // Workaround for this problem is to use temporary files instead of pipes on Windows platform.
            //
            // @see https://bugs.php.net/bug.php?id=51800
            $pipes = array(
                Process::STDOUT => Process::OUT,
                Process::STDERR => Process::ERR,
            );
            $tmpDir = sys_get_temp_dir();
            $error = 'unknown reason';
            set_error_handler(function ($type, $msg) use (&$error) { $error = $msg; });
            for ($i = 0;; ++$i) {
                foreach ($pipes as $pipe => $name) {
                    $file = sprintf('%s\\sf_proc_%02X.%s', $tmpDir, $i, $name);
                    if (file_exists($file) && !unlink($file)) {
                        continue 2;
                    }
                    $h = fopen($file, 'xb');
                    if (!$h && false === strpos($error, 'File exists')) {
                        restore_error_handler();
                        throw new RuntimeException(sprintf('A temporary file could not be opened to write the process output: %s', $error));
                    }
                    if (!$h || !$this->fileHandles[$pipe] = fopen($file, 'rb')) {
                        continue 2;
                    }
                    if (isset($this->files[$pipe])) {
                        unlink($this->files[$pipe]);
                    }
                    $this->files[$pipe] = $file;
                }
                break;
            }
            restore_error_handler();
        }

        parent::__construct($input);
    }

    public function __destruct()
    {
        $this->close();
        $this->removeFiles();
    }

    /**
     * {@inheritdoc}
     */
    public function getDescriptors()
    {
        if (!$this->haveReadSupport) {
            $nullstream = fopen('NUL', 'c');

            return array(
                array('pipe', 'r'),
                $nullstream,
                $nullstream,
            );
        }

        // We're not using pipe on Windows platform as it hangs (https://bugs.php.net/bug.php?id=51800)
        // We're not using file handles as it can produce corrupted output https://bugs.php.net/bug.php?id=65650
        // So we redirect output within the commandline and pass the nul device to the process
        return array(
            array('pipe', 'r'),
            array('file', 'NUL', 'w'),
            array('file', 'NUL', 'w'),
        );
    }

    /**
     * {@inheritdoc}
     */
    public function getFiles()
    {
        return $this->files;
    }

    /**
     * {@inheritdoc}
     */
    public function readAndWrite($blocking, $close = false)
    {
        $this->unblock();
        $w = $this->write();
        $read = $r = $e = array();

        if ($blocking) {
            if ($w) {
                @stream_select($r, $w, $e, 0, Process::TIMEOUT_PRECISION * 1E6);
            } elseif ($this->fileHandles) {
                usleep(Process::TIMEOUT_PRECISION * 1E6);
            }
        }
        foreach ($this->fileHandles as $type => $fileHandle) {
            $data = stream_get_contents($fileHandle, -1, $this->readBytes[$type]);

            if (isset($data[0])) {
                $this->readBytes[$type] += strlen($data);
                $read[$type] = $data;
            }
            if ($close) {
                fclose($fileHandle);
                unset($this->fileHandles[$type]);
            }
        }

        return $read;
    }

    /**
     * {@inheritdoc}
     */
    public function haveReadSupport()
    {
        return $this->haveReadSupport;
    }

    /**
     * {@inheritdoc}
     */
    public function areOpen()
    {
        return $this->pipes && $this->fileHandles;
    }

    /**
     * {@inheritdoc}
     */
    public function close()
    {
        parent::close();
        foreach ($this->fileHandles as $handle) {
            fclose($handle);
        }
        $this->fileHandles = array();
    }

    /**
     * Removes temporary files.
     */
    private function removeFiles()
    {
        foreach ($this->files as $filename) {
            if (file_exists($filename)) {
                @unlink($filename);
            }
        }
        $this->files = array();
    }
}

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