Proyectos de Subversion Moodle

<?php

declare(strict_types=1);

namespace GuzzleHttp\Psr7;

use Psr\Http\Message\StreamInterface;

/**

 * PHP stream implementation.

 */

class Stream implements StreamInterface

{

    /**

     * @see http://php.net/manual/function.fopen.php

     * @see http://php.net/manual/en/function.gzopen.php

     */

    private const READABLE_MODES = '/r|a\+|ab\+|w\+|wb\+|x\+|xb\+|c\+|cb\+/';

    private const WRITABLE_MODES = '/a|w|r\+|rb\+|rw|x|c/';

    /** @var resource */

    private $stream;

    /** @var int|null */

    private $size;

    /** @var bool */

    private $seekable;

    /** @var bool */

    private $readable;

    /** @var bool */

    private $writable;

    /** @var string|null */

    private $uri;

    /** @var mixed[] */

    private $customMetadata;

    /**

     * This constructor accepts an associative array of options.

     *

     * - size: (int) If a read stream would otherwise have an indeterminate

     *   size, but the size is known due to foreknowledge, then you can

     *   provide that size, in bytes.

     * - metadata: (array) Any additional metadata to return when the metadata

     *   of the stream is accessed.

     *

     * @param resource                            $stream  Stream resource to wrap.

     * @param array{size?: int, metadata?: array} $options Associative array of options.

     *

     * @throws \InvalidArgumentException if the stream is not a stream resource

     */

    public function __construct($stream, array $options = [])

    {

        if (!is_resource($stream)) {

            throw new \InvalidArgumentException('Stream must be a resource');

        }

        if (isset($options['size'])) {

            $this->size = $options['size'];

        }

        $this->customMetadata = $options['metadata'] ?? [];

        $this->stream = $stream;

        $meta = stream_get_meta_data($this->stream);

        $this->seekable = $meta['seekable'];

        $this->readable = (bool)preg_match(self::READABLE_MODES, $meta['mode']);

        $this->writable = (bool)preg_match(self::WRITABLE_MODES, $meta['mode']);

        $this->uri = $this->getMetadata('uri');

    }

    /**

     * Closes the stream when the destructed

     */

    public function __destruct()

    {

        $this->close();

    }

    public function __toString(): string

    {

        try {

            if ($this->isSeekable()) {

                $this->seek(0);

            }

            return $this->getContents();

        } catch (\Throwable $e) {

            if (\PHP_VERSION_ID >= 70400) {

                throw $e;

            }

            trigger_error(sprintf('%s::__toString exception: %s', self::class, (string) $e), E_USER_ERROR);

            return '';

        }

    }

    public function getContents(): string

    {

        if (!isset($this->stream)) {

            throw new \RuntimeException('Stream is detached');

        }

        if (!$this->readable) {

            throw new \RuntimeException('Cannot read from non-readable stream');

        }

        return Utils::tryGetContents($this->stream);

    }

    public function close(): void

    {

        if (isset($this->stream)) {

            if (is_resource($this->stream)) {

                fclose($this->stream);

            }

            $this->detach();

        }

    }

    public function detach()

    {

        if (!isset($this->stream)) {

            return null;

        }

        $result = $this->stream;

        unset($this->stream);

        $this->size = $this->uri = null;

        $this->readable = $this->writable = $this->seekable = false;

        return $result;

    }

    public function getSize(): ?int

    {

        if ($this->size !== null) {

            return $this->size;

        }

        if (!isset($this->stream)) {

            return null;

        }

        // Clear the stat cache if the stream has a URI

        if ($this->uri) {

            clearstatcache(true, $this->uri);

        }

        $stats = fstat($this->stream);

        if (is_array($stats) && isset($stats['size'])) {

            $this->size = $stats['size'];

            return $this->size;

        }

        return null;

    }

    public function isReadable(): bool

    {

        return $this->readable;

    }

    public function isWritable(): bool

    {

        return $this->writable;

    }

    public function isSeekable(): bool

    {

        return $this->seekable;

    }

    public function eof(): bool

    {

        if (!isset($this->stream)) {

            throw new \RuntimeException('Stream is detached');

        }

        return feof($this->stream);

    }

    public function tell(): int

    {

        if (!isset($this->stream)) {

            throw new \RuntimeException('Stream is detached');

        }

        $result = ftell($this->stream);

        if ($result === false) {

            throw new \RuntimeException('Unable to determine stream position');

        }

        return $result;

    }

    public function rewind(): void

    {

        $this->seek(0);

    }

    public function seek($offset, $whence = SEEK_SET): void

    {

        $whence = (int) $whence;

        if (!isset($this->stream)) {

            throw new \RuntimeException('Stream is detached');

        }

        if (!$this->seekable) {

            throw new \RuntimeException('Stream is not seekable');

        }

        if (fseek($this->stream, $offset, $whence) === -1) {

            throw new \RuntimeException('Unable to seek to stream position '

                . $offset . ' with whence ' . var_export($whence, true));

        }

    }

    public function read($length): string

    {

        if (!isset($this->stream)) {

            throw new \RuntimeException('Stream is detached');

        }

        if (!$this->readable) {

            throw new \RuntimeException('Cannot read from non-readable stream');

        }

        if ($length < 0) {

            throw new \RuntimeException('Length parameter cannot be negative');

        }

        if (0 === $length) {

            return '';

        }

        try {

            $string = fread($this->stream, $length);

        } catch (\Exception $e) {

            throw new \RuntimeException('Unable to read from stream', 0, $e);

        }

        if (false === $string) {

            throw new \RuntimeException('Unable to read from stream');

        }

        return $string;

    }

    public function write($string): int

    {

        if (!isset($this->stream)) {

            throw new \RuntimeException('Stream is detached');

        }

        if (!$this->writable) {

            throw new \RuntimeException('Cannot write to a non-writable stream');

        }

        // We can't know the size after writing anything

        $this->size = null;

        $result = fwrite($this->stream, $string);

        if ($result === false) {

            throw new \RuntimeException('Unable to write to stream');

        }

        return $result;

    }

    /**

     * {@inheritdoc}

     *

     * @return mixed

     */

    public function getMetadata($key = null)

    {

        if (!isset($this->stream)) {

            return $key ? null : [];

        } elseif (!$key) {

            return $this->customMetadata + stream_get_meta_data($this->stream);

        } elseif (isset($this->customMetadata[$key])) {

            return $this->customMetadata[$key];

        }

        $meta = stream_get_meta_data($this->stream);

        return $meta[$key] ?? null;

    }

}