<?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_Base64EncodedStream extends MWP_Stream_Decorator

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{

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/** @var MWP_Stream_Interface */

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private $buffer;

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const BASE64_BLOCK_SIZE = 4;

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const ORIGIN_BLOCK_SIZE = 3;

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public function __construct(MWP_Stream_Interface $stream)

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{

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parent::__construct($stream);

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$this->buffer = new MWP_Stream_Buffer();

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}

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public function eof()

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{

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

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}

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public function read($length)

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{

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

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if (strlen($readFromBuffer) === $length) {

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return $readFromBuffer;

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}

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$remaining = $length - strlen($readFromBuffer);

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// Calculate the approximate length required to read so that the base64 encoded stream does not have padding.

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// base64 is calculated for blocks of 3 input characters resulting in 4 output characters.

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// strlen(base64_encode($str)) ==> strlen($str) * 4 / 3

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//

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// This leads to:

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//

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// strlen($str) ==> strlen(base64_encode($str)) * 3 / 4

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//

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// Meaning, to read $length characters from the base64 encoded string, read 3/4 of $length from the original stream.

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// $length is first rounded to the first larger number divisible by 4 since base64 encoded strings come in blocks of 4 characters.

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$closestGroupLength = $remaining + (self::BASE64_BLOCK_SIZE - $remaining % self::BASE64_BLOCK_SIZE);

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$read = $closestGroupLength * self::ORIGIN_BLOCK_SIZE / self::BASE64_BLOCK_SIZE;

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$this->buffer->write(base64_encode($this->getStream()->read($read)));

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return $readFromBuffer.$this->buffer->read($remaining);

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}

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}

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