Seditio Source
Root |
./othercms/croogo-4.0.7/vendor/guzzlehttp/psr7/src/PumpStream.php
<?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.
 */
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);
        }
    }
}