<?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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class MWP_Stream_Callable implements MWP_Stream_Interface

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{

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/** @var callable */

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private $source;

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/** @var int */

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private $tellPos = 0;

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/** @var MWP_Stream_Buffer */

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private $buffer;

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/** @var array */

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private $arguments;

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/**

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* @param callable $source Source of the stream data. The callable MAY

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* accept an integer argument used to control the

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* amount of data to return. The callable MUST

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* return a string when called, or false on error

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* or EOF.

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* @param array $arguments

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*/

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public function __construct($source, array $arguments = array())

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{

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$this->source = $source;

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$this->buffer = new MWP_Stream_Buffer();

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$this->arguments = $arguments;

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}

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public function close()

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{

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$this->tellPos = false;

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$this->source = null;

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$this->arguments = array();

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}

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public function tell()

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{

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return $this->tellPos;

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}

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public function eof()

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{

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if ($this->source !== null) {

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return false;

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}

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if ($this->source === null && $this->buffer !== null) {

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return $this->buffer->eof();

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}

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return true;

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}

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public function isSeekable()

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{

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return false;

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}

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public function seek($offset, $whence = SEEK_SET)

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{

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return false;

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}

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public function read($length)

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{

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$data = $this->buffer->read($length);

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$readLen = strlen($data);

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$this->tellPos += $readLen;

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$remaining = $length - $readLen;

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if ($remaining) {

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$this->pump($remaining);

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$data .= $this->buffer->read($remaining);

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$this->tellPos += strlen($data) - $readLen;

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}

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return $data;

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}

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public function __toString()

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{

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$buffer = '';

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while (!$this->eof()) {

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$buffer .= $this->read(1048576);

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}

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return $buffer;

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}

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private function pump($length)

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{

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if ($this->source) {

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do {

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$data = call_user_func_array($this->source, array_merge(array($length), $this->arguments));

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if ($data === false || $data === null) {

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$this->source = null;

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return;

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}

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if ($data instanceof MWP_Stream_Interface) {

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$this->source = null;

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$this->buffer = $data;

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return;

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}

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$this->buffer->write($data);

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$length -= strlen($data);

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} while ($length > 0);

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}

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}

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}

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