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<?php

namespace GuzzleHttp\Psr7;

use Psr\Http\Message\StreamInterface;

/**
 * Provides a read only stream that pumps data from a PHP callable.
 *
 * When invoking the provided callable, the PumpStream will pass the amount of
 * data requested to read to the callable. The callable can choose to ignore
 * this value and return fewer or more bytes than requested. Any extra data
 * returned by the provided callable is buffered internally until drained using
 * the read() function of the PumpStream. The provided callable MUST return
 * false when there is no more data to read.
 *
 * @final
 */
class PumpStream implements StreamInterface
{
    /** @var callable */
    private $source;

/** @var int */
    private $size;

/** @var int */
    private $tellPos = 0;

/** @var array */
    private $metadata;

/** @var BufferStream */
    private $buffer;

/**
     * @param callable $source  Source of the stream data. The callable MAY
     *                          accept an integer argument used to control the
     *                          amount of data to return. The callable MUST
     *                          return a string when called, or false on error
     *                          or EOF.
     * @param array    $options Stream options:
     *                          - metadata: Hash of metadata to use with stream.
     *                          - size: Size of the stream, if known.
     */
    public function __construct(callable $source, array $options = [])
    {
        $this->source = $source;
        $this->size = isset($options['size']) ? $options['size'] : null;
        $this->metadata = isset($options['metadata']) ? $options['metadata'] : [];
        $this->buffer = new BufferStream();
    }

public function __toString()
    {
        try {
            return Utils::copyToString($this);
        } catch (\Exception $e) {
            return '';
        }
    }

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

public function detach()
    {
        $this->tellPos = false;
        $this->source = null;

return null;
    }

public function getSize()
    {
        return $this->size;
    }

public function tell()
    {
        return $this->tellPos;
    }

public function eof()
    {
        return !$this->source;
    }

public function isSeekable()
    {
        return false;
    }

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

public function seek($offset, $whence = SEEK_SET)
    {
        throw new \RuntimeException('Cannot seek a PumpStream');
    }

public function isWritable()
    {
        return false;
    }

public function write($string)
    {
        throw new \RuntimeException('Cannot write to a PumpStream');
    }

public function isReadable()
    {
        return true;
    }

public function read($length)
    {
        $data = $this->buffer->read($length);
        $readLen = strlen($data);
        $this->tellPos += $readLen;
        $remaining = $length - $readLen;

if ($remaining) {
            $this->pump($remaining);
            $data .= $this->buffer->read($remaining);
            $this->tellPos += strlen($data) - $readLen;
        }

return $data;
    }

public function getContents()
    {
        $result = '';
        while (!$this->eof()) {
            $result .= $this->read(1000000);
        }

return $result;
    }

public function getMetadata($key = null)
    {
        if (!$key) {
            return $this->metadata;
        }

return isset($this->metadata[$key]) ? $this->metadata[$key] : null;
    }

private function pump($length)
    {
        if ($this->source) {
            do {
                $data = call_user_func($this->source, $length);
                if ($data === false || $data === null) {
                    $this->source = null;
                    return;
                }
                $this->buffer->write($data);
                $length -= strlen($data);
            } while ($length > 0);
        }
    }
}

Nama File / Folder	Size	Action
AppendStream.php	5.633KB	Edit File Delete File Rename
BufferStream.php	3.007KB	Edit File Delete File Rename
CachingStream.php	4.346KB	Edit File Delete File Rename
DroppingStream.php	1.068KB	Edit File Delete File Rename
FnStream.php	3.865KB	Edit File Delete File Rename
Header.php	2.127KB	Edit File Delete File Rename
InflateStream.php	1.802KB	Edit File Delete File Rename
LazyOpenStream.php	0.879KB	Edit File Delete File Rename
LimitStream.php	4.126KB	Edit File Delete File Rename
Message.php	8.082KB	Edit File Delete File Rename
MessageTrait.php	7.672KB	Edit File Delete File Rename
MimeType.php	4.989KB	Edit File Delete File Rename
MultipartStream.php	4.657KB	Edit File Delete File Rename
NoSeekStream.php	0.429KB	Edit File Delete File Rename
PumpStream.php	3.988KB	Edit File Delete File Rename
Query.php	3.408KB	Edit File Delete File Rename
Request.php	3.632KB	Edit File Delete File Rename
Response.php	4.696KB	Edit File Delete File Rename
ServerRequest.php	9.621KB	Edit File Delete File Rename
Stream.php	6.65KB	Edit File Delete File Rename
StreamDecoratorTrait.php	3.214KB	Edit File Delete File Rename
StreamWrapper.php	3.69KB	Edit File Delete File Rename
UploadedFile.php	7.589KB	Edit File Delete File Rename
Uri.php	22.361KB	Edit File Delete File Rename
UriComparator.php	1.147KB	Edit File Delete File Rename
UriNormalizer.php	8.136KB	Edit File Delete File Rename
UriResolver.php	8.583KB	Edit File Delete File Rename
Utils.php	14.329KB	Edit File Delete File Rename
functions.php	13.095KB	Edit File Delete File Rename
functions_include.php	0.152KB	Edit File Delete File Rename