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<?php

namespace GuzzleHttp\Psr7;

use
Psr\Http\Message\StreamInterface;


/**
 * Decorator used to return only a subset of a stream
 */
class LimitStream implements StreamInterface
{
    use
StreamDecoratorTrait;

   
/** @var int Offset to start reading from */
   
private $offset;

   
/** @var int Limit the number of bytes that can be read */
   
private $limit;

   
/**
     * @param StreamInterface $stream Stream to wrap
     * @param int             $limit  Total number of bytes to allow to be read
     *                                from the stream. Pass -1 for no limit.
     * @param int             $offset Position to seek to before reading (only
     *                                works on seekable streams).
     */
   
public function __construct(
       
StreamInterface $stream,
       
$limit = -1,
       
$offset = 0
   
) {
       
$this->stream = $stream;
       
$this->setLimit($limit);
       
$this->setOffset($offset);
    }

    public function
eof()
    {
       
// Always return true if the underlying stream is EOF
       
if ($this->stream->eof()) {
            return
true;
        }

       
// No limit and the underlying stream is not at EOF
       
if ($this->limit == -1) {
            return
false;
        }

        return
$this->stream->tell() >= $this->offset + $this->limit;
    }

   
/**
     * Returns the size of the limited subset of data
     * {@inheritdoc}
     */
   
public function getSize()
    {
        if (
null === ($length = $this->stream->getSize())) {
            return
null;
        } elseif (
$this->limit == -1) {
            return
$length - $this->offset;
        } else {
            return
min($this->limit, $length - $this->offset);
        }
    }

   
/**
     * Allow for a bounded seek on the read limited stream
     * {@inheritdoc}
     */
   
public function seek($offset, $whence = SEEK_SET)
    {
        if (
$whence !== SEEK_SET || $offset < 0) {
            throw new \
RuntimeException(sprintf(
               
'Cannot seek to offset %s with whence %s',
               
$offset,
               
$whence
           
));
        }

       
$offset += $this->offset;

        if (
$this->limit !== -1) {
            if (
$offset > $this->offset + $this->limit) {
               
$offset = $this->offset + $this->limit;
            }
        }

       
$this->stream->seek($offset);
    }

   
/**
     * Give a relative tell()
     * {@inheritdoc}
     */
   
public function tell()
    {
        return
$this->stream->tell() - $this->offset;
    }

   
/**
     * Set the offset to start limiting from
     *
     * @param int $offset Offset to seek to and begin byte limiting from
     *
     * @throws \RuntimeException if the stream cannot be seeked.
     */
   
public function setOffset($offset)
    {
       
$current = $this->stream->tell();

        if (
$current !== $offset) {
           
// If the stream cannot seek to the offset position, then read to it
           
if ($this->stream->isSeekable()) {
               
$this->stream->seek($offset);
            } elseif (
$current > $offset) {
                throw new \
RuntimeException("Could not seek to stream offset $offset");
            } else {
               
$this->stream->read($offset - $current);
            }
        }

       
$this->offset = $offset;
    }

   
/**
     * Set the limit of bytes that the decorator allows to be read from the
     * stream.
     *
     * @param int $limit Number of bytes to allow to be read from the stream.
     *                   Use -1 for no limit.
     */
   
public function setLimit($limit)
    {
       
$this->limit = $limit;
    }

    public function
read($length)
    {
        if (
$this->limit == -1) {
            return
$this->stream->read($length);
        }

       
// Check if the current position is less than the total allowed
        // bytes + original offset
       
$remaining = ($this->offset + $this->limit) - $this->stream->tell();
        if (
$remaining > 0) {
           
// Only return the amount of requested data, ensuring that the byte
            // limit is not exceeded
           
return $this->stream->read(min($remaining, $length));
        }

        return
'';
    }
}