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Edit File: Stream.php

<?php

namespace GuzzleHttp\Psr7;

use Psr\Http\Message\StreamInterface;

/**
 * PHP stream implementation.
 *
 * @var $stream
 */
class Stream implements StreamInterface
{
    /**
     * Resource modes.
     *
     * @var string
     *
     * @see http://php.net/manual/function.fopen.php
     * @see http://php.net/manual/en/function.gzopen.php
     */
    const READABLE_MODES = '/r|a\+|ab\+|w\+|wb\+|x\+|xb\+|c\+|cb\+/';
    const WRITABLE_MODES = '/a|w|r\+|rb\+|rw|x|c/';

private $stream;
    private $size;
    private $seekable;
    private $readable;
    private $writable;
    private $uri;
    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    $options Associative array of options.
     *
     * @throws \InvalidArgumentException if the stream is not a stream resource
     */
    public function __construct($stream, $options = [])
    {
        if (!is_resource($stream)) {
            throw new \InvalidArgumentException('Stream must be a resource');
        }

if (isset($options['size'])) {
            $this->size = $options['size'];
        }

$this->customMetadata = isset($options['metadata'])
            ? $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()
    {
        try {
            if ($this->isSeekable()) {
                $this->seek(0);
            }
            return $this->getContents();
        } catch (\Exception $e) {
            return '';
        }
    }

public function getContents()
    {
        if (!isset($this->stream)) {
            throw new \RuntimeException('Stream is detached');
        }

$contents = stream_get_contents($this->stream);

if ($contents === false) {
            throw new \RuntimeException('Unable to read stream contents');
        }

return $contents;
    }

public function close()
    {
        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()
    {
        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 (isset($stats['size'])) {
            $this->size = $stats['size'];
            return $this->size;
        }

return null;
    }

public function isReadable()
    {
        return $this->readable;
    }

public function isWritable()
    {
        return $this->writable;
    }

public function isSeekable()
    {
        return $this->seekable;
    }

public function eof()
    {
        if (!isset($this->stream)) {
            throw new \RuntimeException('Stream is detached');
        }

return feof($this->stream);
    }

public function tell()
    {
        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()
    {
        $this->seek(0);
    }

public function seek($offset, $whence = SEEK_SET)
    {
        $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($length)
    {
        if (!isset($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 '';
        }

$string = fread($this->stream, $length);
        if (false === $string) {
            throw new \RuntimeException('Unable to read from stream');
        }

return $string;
    }

public function write($string)
    {
        if (!isset($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;
    }

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 isset($meta[$key]) ? $meta[$key] : null;
    }
}