Server : Apache System : Linux pod-100823:apache2_74:v0.5.7 5.4.0-1138-gcp #147~18.04.1-Ubuntu SMP Mon Oct 7 21:46:26 UTC 2024 x86_64 User : www-data ( 33) PHP Version : 7.4.33.7 Disable Function : apache_child_terminate,apache_get_modules,apache_get_version,apache_getenv,apache_note,apache_setenv,disk_free_space,disk_total_space,diskfreespace,dl,exec,fastcgi_finish_request,link,opcache_compile_file,opcache_get_configuration,opcache_invalidate,opcache_is_script_cached,opcache_reset,passthru,pclose,pcntl_exec,popen,posix_getpid,posix_getppid,posix_getpwuid,posix_kill,posix_mkfifo,posix_setegid,posix_seteuid,posix_setgid,posix_setpgid,posix_setsid,posix_setuid,posix_uname,proc_close,proc_get_status,proc_nice,proc_open,proc_terminate,realpath_cache_get,shell_exec,show_source,symlink,system Directory :  /nas/content/live/attorneyexperi/wp-content/plugins/ugslot/MWP/Stream/

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<?php
/*
 * This file is part of the ManageWP Worker plugin.
 *
 * (c) ManageWP LLC <contact@managewp.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

class MWP_Stream_Base64EncodedStream extends MWP_Stream_Decorator
{

    /** @var MWP_Stream_Interface */
    private $buffer;

    const BASE64_BLOCK_SIZE = 4;
    const ORIGIN_BLOCK_SIZE = 3;

    public function __construct(MWP_Stream_Interface $stream)
    {
        parent::__construct($stream);
        $this->buffer = new MWP_Stream_Buffer();
    }

    public function eof()
    {
        return $this->buffer->eof() && $this->getStream()->eof();
    }

    public function read($length)
    {
        $readFromBuffer = $this->buffer->read($length);
        if (strlen($readFromBuffer) === $length) {
            return $readFromBuffer;
        }

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

        // Calculate the approximate length required to read so that the base64 encoded stream does not have padding.
        // base64 is calculated for blocks of 3 input characters resulting in 4 output characters.
        // strlen(base64_encode($str)) ==> strlen($str) * 4 / 3
        //
        // This leads to:
        //
        // strlen($str) ==> strlen(base64_encode($str)) * 3 / 4
        //
        // Meaning, to read $length characters from the base64 encoded string, read 3/4 of $length from the original stream.
        // $length is first rounded to the first larger number divisible by 4 since base64 encoded strings come in blocks of 4 characters.
        $closestGroupLength = $remaining + (self::BASE64_BLOCK_SIZE - $remaining % self::BASE64_BLOCK_SIZE);
        $read               = $closestGroupLength * self::ORIGIN_BLOCK_SIZE / self::BASE64_BLOCK_SIZE;
        $this->buffer->write(base64_encode($this->getStream()->read($read)));

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