<?php

/**
 * Обрабатывает HTTP ответ
 */
class HttpConnectionResponse
{
    private $offset;
    private $param = array ();
    private $code;

    public function __construct($response)
    {
        $this->offset = 0;
        $this->response = $response;
        $this->parseMessage();
    }        

    /**
     * Обработка HTTP ответа
     */
    private function parseMessage()
    {
        $http = explode(" ", $this->getLine());
        $this->version = $http[0];
        $this->code    = $http[1];

        $line = $this->getLine();       
        while ($offset = strpos($line, ":")) {
            $this->param[substr($line, 0, $offset)] = trim(substr($line, $offset + 1));
            $line = $this->getLine();
        }

        if (isset($this->param['Transfer-Encoding']) && $this->param['Transfer-Encoding'] == 'chunked') {
            //$this->data = substr($this->response, $this->offset);
            $line = hexdec($this->getLine());
            $chunk = array();
            while ($line > 0) {
                $chunk [] = substr($this->response, $this->offset, $line);
                $this->offset += $line;
                $line = hexdec($this->getLine());
            }

            $this->data = implode("", $chunk);
        } else {
            $this->data = substr($this->response, $this->offset);
        }
    }

    /**
     * Обработка строки HTTP ответа
     */
    private function getLine()
    {
        $begin = $this->offset;
        $offset = strpos($this->response, "\r\n", $this->offset);
        $result = substr($this->response, $begin, $offset - $begin); 
        $this->offset = $offset + 2;
        return $result;
    }

    /**
     * Значение параметра HTTP ответа
     */
    public function getParameter($name) 
    {
        return $this->param[$name];
    }

    public function getData() 
    {
        return $this->data;
    }

    /**
     * Состояние 
     */
    public function getCode() 
    {
        return $this->code;
    }
}