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<?php namespace WillWashburn\Stream;
use WillWashburn\Stream\Exception\StreamBufferTooSmallException;
/**
* Class Stream
*
* @package FasterImage
*/
class Stream implements StreamableInterface
{
/**
* The string that we have downloaded so far
*/
protected $stream_string = '';
/**
* The pointer in the string
*
* @var int
*/
protected $strpos = 0;
/**
* Get characters from the string but don't move the pointer
*
* @param $characters
*
* @return string
* @throws StreamBufferTooSmallException
*/
public function peek($characters)
{
if ( strlen($this->stream_string) < $this->strpos + $characters ) {
throw new StreamBufferTooSmallException('Not enough of the stream available.');
}
return substr($this->stream_string, $this->strpos, $characters);
}
/**
* Get Characters from the string
*
* @param $characters
*
* @return string
* @throws StreamBufferTooSmallException
*/
public function read($characters)
{
$result = $this->peek($characters);
$this->strpos += $characters;
return $result;
}
/**
* Resets the pointer to the 0 position
*
* @return mixed
*/
public function resetPointer()
{
$this->strpos = 0;
}
/**
* Append to the stream string
*
* @param $string
*/
public function write($string)
{
$this->stream_string .= $string;
}
}
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