/githelper.php

<?php

	function getRepoDescription($repopath) {

		$descriptionpath = $repopath . '/description';

		return file_exists($descriptionpath) ? file_get_contents($repopath . '/description') : "Error: Repository does not exist";

	}

	

	function getLastUpdate($repopath) {

		if(file_exists($repopath)) {

			$repo = new Git($repopath);

			$branch_hash = $repo->getTip('master');

			$branch = $repo->getObject($branch_hash);

			

			return date("D M jS, Y H:i:s", $branch->committer->time + $branch->committer->offset);			

		} else {

			return "Error: Repository does not exist";

		}

	}

		

	function isTag($tags, $commithash) {

		foreach($tags as $tag => $commit) {

			if($commit->getName() == $commithash) return $tag;

		}

	}

	

	function sha1_short($sha1_long) {

		return substr($sha1_long, 0, 10);

	}

	

	function getTotalCommits($repopath) {

		$repo = new Git($repopath);

		$master_name = $repo->getTip('master');

		$master = $repo->getObject($master_name);

		return count($master->getHistory());

	}



	function isBinaryData($data) {

		$sampleSize = 100;

		$max = 5;

		$badChars = 0;

		$isBinary = false;

		

		if(strlen($data) > $sampleSize) {

			$data = substr($data, 0, $sampleSize);

		}

		

		$chars = str_split($data);

		foreach($chars as $char) {

			if($char != " " && $char != "	" && $char != "\n" && $char != "\r" && ctype_cntrl($char)) {

				$badChars++;

			}

			

			if($badChars >= $max) {

				$isBinary = true;

			}

		}

		

		return $isBinary;

	}

	

	function hasBom($data) {

		if(strlen($data) < 3) return false;

		

		return (substr($data, 0, 3) == pack("CCC", 0xef, 0xbb, 0xbf));

	}



	function __computeUnsignedChecksum($bytestring) {

		$unsigned_chksum = 0;

	

		for($i=0; $i<512; $i++)

			$unsigned_chksum += ord($bytestring[$i]);

		for($i=0; $i<8; $i++)

			$unsigned_chksum -= ord($bytestring[148 + $i]);

			

		$unsigned_chksum += ord(" ") * 8;



		return $unsigned_chksum;

	}



	function tarSection($Name, $Data, $information=NULL) {

		// Generate the TAR header for this file

		$header = "";

		

		$header .= str_pad($Name,100,chr(0));

		$header .= str_pad("777",7,"0",STR_PAD_LEFT) . chr(0);

		$header .= str_pad(decoct($information["user_id"]),7,"0",STR_PAD_LEFT) . chr(0);

		$header .= str_pad(decoct($information["group_id"]),7,"0",STR_PAD_LEFT) . chr(0);

		$header .= str_pad(decoct(strlen($Data)),11,"0",STR_PAD_LEFT) . chr(0);

		$header .= str_pad(decoct(time(0)),11,"0",STR_PAD_LEFT) . chr(0);

		$header .= str_repeat(" ",8);

		$header .= "0";

		$header .= str_repeat(chr(0),100);

		$header .= str_pad("ustar",6,chr(32));

		$header .= chr(32) . chr(0);

		$header .= str_pad($information["user_name"],32,chr(0));

		$header .= str_pad($information["group_name"],32,chr(0));

		$header .= str_repeat(chr(0),8);

		$header .= str_repeat(chr(0),8);

		$header .= str_repeat(chr(0),155);

		$header .= str_repeat(chr(0),12);



		// Compute header checksum

		$checksum = str_pad(decoct(__computeUnsignedChecksum($header)),6,"0",STR_PAD_LEFT);

		for($i=0; $i<6; $i++) {

			$header[(148 + $i)] = substr($checksum,$i,1);

		}

		$header[154] = chr(0);

		$header[155] = chr(32);



		// Pad file contents to byte count divisible by 512

		$file_contents = str_pad($Data,(ceil(strlen($Data) / 512) * 512),chr(0));



		// Add new tar formatted data to tar file contents

		$tar_file = $header . $file_contents;



		return $tar_file;

	}



	function getDataUri($imagedata, $mime = '') {

		return 'data:'.$mime.';base64,'.base64_encode($imagedata);

	}

?>