<?php

class HTTP_Request extends Request {

	var $header, $method = 'GET';

	function HTTP_Request($server, $timeout = 15) {
		$this->Constructor($server, $timeout);
	}

	function Constructor($server, $timeout = 15) {
		parent::Constructor($server, 80, $timeout);

		$this->header = &new Header();
		$this->header->addHeader('Host', $server);
		$this->header->addHeader('Accept-Encoding', 'gzip');
		$this->header->addHeader('Connection', 'close');
	}

	function write($file) {
		$this->header->setFirstLine($this->method.' '.$file.' HTTP/1.1');
		parent::write($this->header->makeRequest());
	}

	function &readHeader() {
		$header = '';
		do {
			$header .= $this->readln();
		} while (!$this->eof() && substr($header, -4) != "\r\n\r\n");

		if (substr($header, -4) != "\r\n\r\n") {
			trigger_error('no valid HTTP Response: '.$header);
			return false;
		}

		$headerObj = &new Header();
		$headerObj->parseResponse($header);

		return $headerObj;
	}

	function readChunk() {
		$size = $this->nextChunkSize();
		if (!$size || $size < 1) {
			return false;
		}
		$chunk = $this->read($size);
		$this->read(2);
		return $chunk;
	}

	function nextChunkSize() {
		$size = $this->readln();
		return hexdec(substr($size, 0, -2));
	}

	function readContent(&$header) {
		if ($header->inValue('transfer-encoding', 'chunked')) {
			$content = '';
			while ($chunk = $this->readChunk()) {
				$content .= $chunk;
			}
		} else {
			$content = $this->readAll();
		}

		return ($header->inValue('content-encoding', 'gzip') ?
		        gzinflate(substr($content, 10)) : $content);
	}

	function download($path, &$file) {
		if (!$this->connect()) {
			return false;
		}

		$this->write($path);
		$header = &$this->readHeader();

		if (!$header) {
			$this->close();
			return false;
		}

		if ($header->exists('last-modified')
		&& $file->is_uptodate(strtotime($header->getHeader('last-modified')))) {
			return true;
		}

		$content = $this->readContent($header);
		$this->close();
		if (!$content) {
			return false;
		}

		return $file->write_once($content);
	}

}

?>