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<?php |
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/* |
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* This file is part of the ManageWP Worker plugin. |
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* |
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* (c) ManageWP LLC <contact@managewp.com> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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|
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class MWP_Stream_Limit implements MWP_Stream_Interface |
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{ |
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|
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/** |
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* @var MWP_Stream_Interface |
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*/ |
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private $stream; |
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|
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/** |
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* @var int |
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*/ |
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private $offset = 0; |
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|
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/** |
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* @var int |
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*/ |
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private $limit = -1; |
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|
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public function __construct(MWP_Stream_Interface $stream, $offset = 0, $limit = -1) |
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{ |
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$this->stream = $stream; |
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$this->setOffset($offset); |
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$this->limit = $limit; |
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} |
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|
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/** |
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* {@inheritdoc} |
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*/ |
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public function eof() |
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{ |
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// Always return true if the underlying stream is EOF |
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if ($this->stream->eof()) { |
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return true; |
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} |
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|
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// No limit and the underlying stream is not at EOF |
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if ($this->limit == -1) { |
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return false; |
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} |
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|
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$tell = $this->stream->tell(); |
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if ($tell === false) { |
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return false; |
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} |
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|
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return $tell >= $this->offset + $this->limit; |
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} |
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|
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/** |
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* {@inheritdoc} |
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*/ |
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public function read($length) |
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{ |
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if ($this->limit == -1) { |
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return $this->stream->read($length); |
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} |
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|
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// Check if the current position is less than the total allowed |
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// bytes + original offset |
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$remaining = ($this->offset + $this->limit) - $this->stream->tell(); |
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if ($remaining > 0) { |
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// Only return the amount of requested data, ensuring that the byte |
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// limit is not exceeded |
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return $this->stream->read(min($remaining, $length)); |
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} else { |
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return false; |
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} |
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} |
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|
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/** |
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* {@inheritdoc} |
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*/ |
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public function setOffset($offset) |
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{ |
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$current = $this->stream->tell(); |
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|
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if ($current !== $offset) { |
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// If the stream cannot seek to the offset position, then read to it |
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if (!$this->stream->seek($offset)) { |
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$this->stream->read($offset - $current); |
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} |
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} |
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|
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$this->offset = $offset; |
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|
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return $this; |
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} |
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|
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/** |
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* {@inheritdoc} |
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*/ |
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public function tell() |
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{ |
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return $this->stream->tell() - $this->offset; |
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} |
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|
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/** |
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* {@inheritdoc} |
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*/ |
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public function isSeekable() |
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{ |
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return $this->stream->isSeekable(); |
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} |
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|
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/** |
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* {@inheritdoc} |
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*/ |
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public function seek($offset, $whence = SEEK_SET) |
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{ |
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if ($whence !== SEEK_SET || $offset < 0) { |
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return false; |
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} |
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|
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$offset += $this->offset; |
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|
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if ($this->limit !== -1) { |
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if ($offset > $this->offset + $this->limit) { |
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$offset = $this->offset + $this->limit; |
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} |
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} |
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|
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return $this->stream->seek($offset); |
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} |
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|
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/** |
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* {@inheritdoc} |
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*/ |
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public function close() |
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{ |
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$this->stream->close(); |
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} |
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|
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public function __toString() |
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{ |
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$buffer = ''; |
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|
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while (!$this->eof()) { |
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$buffer .= $this->read(1048576); |
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} |
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|
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return $buffer; |
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} |
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} |
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|
