# woocommerce-pos/1.10.20/vendor_prefixed/guzzlehttp/psr7/src/Stream.php

WCPOS – Point of Sale (POS) plugin for WooCommerce, version 1.10.20. 273 lines.

- Page: https://pluginprobe.com/plugins/woocommerce-pos/1.10.20/code/vendor_prefixed/guzzlehttp/psr7/src/Stream.php
- Raw: https://pluginprobe.com/plugins/woocommerce-pos/1.10.20/raw/vendor_prefixed/guzzlehttp/psr7/src/Stream.php
- Modified: 2026-09-01T14:48:10+00:00

Line numbers below start at 1. Link to a line or a range by appending a fragment to the
page URL, for example `https://pluginprobe.com/plugins/woocommerce-pos/1.10.20/code/vendor_prefixed/guzzlehttp/psr7/src/Stream.php#L10-L20`.

```php
<?php

declare (strict_types=1);
namespace WCPOS\Vendor\GuzzleHttp\Psr7;

use WCPOS\Vendor\GuzzleHttp\Psr7\Exception\TimeoutException;
use WCPOS\Vendor\Psr\Http\Message\StreamInterface;
/**
 * PHP stream implementation.
 */
class Stream implements StreamInterface
{
    use NonSerializableStreamTrait;
    /** @var resource */
    private $stream;
    private ?int $size = null;
    private bool $seekable;
    private bool $readable;
    private bool $writable;
    private ?string $uri = null;
    /** @var mixed[] */
    private array $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');
        }
        $this->size = Integers::assertOptionalNonNegativeSize($options['size'] ?? null, 'Stream size');
        $this->customMetadata = $options['metadata'] ?? [];
        $this->stream = $stream;
        $meta = \stream_get_meta_data($this->stream);
        $this->seekable = $meta['seekable'];
        $this->readable = self::isReadableMode($meta['mode']);
        $this->writable = self::isWritableMode($meta['mode']);
        $this->uri = $meta['uri'] ?? null;
    }
    /**
     * Closes the stream when the destructed
     */
    public function __destruct()
    {
        $this->close();
    }
    public function __toString() : string
    {
        if ($this->isSeekable()) {
            $this->seek(0);
        }
        return $this->getContents();
    }
    public function getContents() : string
    {
        if (!isset($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 ($stats === \false) {
            return null;
        }
        $this->size = Integers::assertEngineInteger($stats['size'], 'Stream size');
        return $this->size;
    }
    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');
        }
        $position = Integers::assertEngineInteger($result, 'Stream position');
        if ($position === null) {
            throw new \RuntimeException('Unable to determine stream position');
        }
        return $position;
    }
    public function rewind() : void
    {
        $this->seek(0);
    }
    public function seek(int $offset, int $whence = \SEEK_SET) : void
    {
        if (!isset($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(int $length) : string
    {
        if (!isset($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 (TimeoutException $e) {
            throw $e;
        } catch (\Exception $e) {
            if ($this->timedOut()) {
                throw new TimeoutException('Unable to read from stream: timed out', 0, $e);
            }
            throw new \RuntimeException('Unable to read from stream', 0, $e);
        }
        if (\false === $string) {
            if ($this->timedOut()) {
                throw new TimeoutException('Unable to read from stream: timed out');
            }
            throw new \RuntimeException('Unable to read from stream');
        }
        if ($string === '' && $this->timedOut()) {
            throw new TimeoutException('Unable to read from stream: timed out');
        }
        return $string;
    }
    public function write(string $string) : int
    {
        if (!isset($this->stream)) {
            throw new \RuntimeException('Stream is detached');
        }
        if (!$this->writable) {
            throw new \RuntimeException('Cannot write to a non-writable stream');
        }
        if ($string === '') {
            return 0;
        }
        // We can't know the size after writing anything
        $this->size = null;
        try {
            $result = \fwrite($this->stream, $string);
        } catch (TimeoutException $e) {
            throw $e;
        } catch (\Exception $e) {
            if ($this->writeTimedOut()) {
                throw new TimeoutException('Unable to write to stream: timed out', 0, $e);
            }
            throw new \RuntimeException('Unable to write to stream', 0, $e);
        }
        if ($result === \false) {
            if ($this->writeTimedOut()) {
                throw new TimeoutException('Unable to write to stream: timed out');
            }
            throw new \RuntimeException('Unable to write to stream');
        }
        if ($result === 0 && $this->writeTimedOut()) {
            throw new TimeoutException('Unable to write to stream: timed out');
        }
        return $result;
    }
    /**
     * @return mixed
     */
    public function getMetadata(?string $key = null)
    {
        if (!isset($this->stream)) {
            return $key === null ? [] : null;
        } elseif ($key === null) {
            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;
    }
    /**
     * @see https://www.php.net/manual/en/function.fopen.php
     * @see https://www.php.net/manual/en/function.gzopen.php
     */
    private static function isReadableMode(string $mode) : bool
    {
        return \str_starts_with($mode, 'r') || \str_contains($mode, '+');
    }
    /**
     * @see https://www.php.net/manual/en/function.fopen.php
     * @see https://www.php.net/manual/en/function.gzopen.php
     */
    private static function isWritableMode(string $mode) : bool
    {
        return \str_starts_with($mode, 'a') || \str_starts_with($mode, 'w') || \str_starts_with($mode, 'x') || \str_starts_with($mode, 'c') || \str_contains($mode, '+');
    }
    private function timedOut() : bool
    {
        return StreamTimeout::isResourceReadTimedOut($this->stream);
    }
    private function writeTimedOut() : bool
    {
        return StreamTimeout::isResourceWriteTimedOut($this->stream);
    }
}

```