Method to convert a Blob to a string of Hex characters

AnotherBoringUtilClass.BlobToHex.cls.java

private static string BlobToHex(Blob input){
		Map<string, Integer> base64 = new map<string, Integer>{'A'=>0,'B'=>1,'C'=>2,'D'=>3,'E'=>4,'F'=>5,'G'=>6,'H'=>7,'I'=>8,'J'=>9,'K'=>10,'L'=>11,'M'=>12,'N'=>13,'O'=>14,'P'=>15,'Q'=>16,'R'=>17,'S'=>18,'T'=>19,'U'=>20,'V'=>21,'W'=>22,'X'=>23,'Y'=>24,'Z'=>25,'a'=>26,'b'=>27,'c'=>28,'d'=>29,'e'=>30,'f'=>31,'g'=>32,'h'=>33,'i'=>34,'j'=>35,'k'=>36,'l'=>37,'m'=>38,'n'=>39,'o'=>40,'p'=>41,'q'=>42,'r'=>43,'s'=>44,'t'=>45,'u'=>46,'v'=>47,'w'=>48,'x'=>49,'y'=>50,'z'=>51,'0'=>52,'1'=>53,'2'=>54,'3'=>55,'4'=>56,'5'=>57,'6'=>58,'7'=>59,'8'=>60,'9'=>61,'+'=>62,'/'=>63};
		Map<integer, string> hex = new Map<integer, string>{0=>'00',1=>'01',2=>'02',3=>'03',4=>'04',5=>'05',6=>'06',7=>'07',8=>'08',9=>'09',10=>'0A',11=>'0B',12=>'0C',13=>'0D',14=>'0E',15=>'0F',16=>'10',17=>'11',18=>'12',19=>'13',20=>'14',21=>'15',22=>'16',23=>'17',24=>'18',25=>'19',26=>'1A',27=>'1B',28=>'1C',29=>'1D',30=>'1E',31=>'1F',32=>'20',33=>'21',34=>'22',35=>'23',36=>'24',37=>'25',38=>'26',39=>'27',40=>'28',41=>'29',42=>'2A',43=>'2B',44=>'2C',45=>'2D',46=>'2E',47=>'2F',48=>'30',49=>'31',50=>'32',51=>'33',52=>'34',53=>'35',54=>'36',55=>'37',56=>'38',57=>'39',58=>'3A',59=>'3B',60=>'3C',61=>'3D',62=>'3E',63=>'3F',64=>'40',65=>'41',66=>'42',67=>'43',68=>'44',69=>'45',70=>'46',71=>'47',72=>'48',73=>'49',74=>'4A',75=>'4B',76=>'4C',77=>'4D',78=>'4E',79=>'4F',80=>'50',81=>'51',82=>'52',83=>'53',84=>'54',85=>'55',86=>'56',87=>'57',88=>'58',89=>'59',90=>'5A',91=>'5B',92=>'5C',93=>'5D',94=>'5E',95=>'5F',96=>'60',97=>'61',98=>'62',99=>'63',100=>'64',101=>'65',102=>'66',103=>'67',104=>'68',105=>'69',106=>'6A',107=>'6B',108=>'6C',109=>'6D',110=>'6E',111=>'6F',112=>'70',113=>'71',114=>'72',115=>'73',116=>'74',117=>'75',118=>'76',119=>'77',120=>'78',121=>'79',122=>'7A',123=>'7B',124=>'7C',125=>'7D',126=>'7E',127=>'7F',128=>'80',129=>'81',130=>'82',131=>'83',132=>'84',133=>'85',134=>'86',135=>'87',136=>'88',137=>'89',138=>'8A',139=>'8B',140=>'8C',141=>'8D',142=>'8E',143=>'8F',144=>'90',145=>'91',146=>'92',147=>'93',148=>'94',149=>'95',150=>'96',151=>'97',152=>'98',153=>'99',154=>'9A',155=>'9B',156=>'9C',157=>'9D',158=>'9E',159=>'9F',160=>'A0',161=>'A1',162=>'A2',163=>'A3',164=>'A4',165=>'A5',166=>'A6',167=>'A7',168=>'A8',169=>'A9',170=>'AA',171=>'AB',172=>'AC',173=>'AD',174=>'AE',175=>'AF',176=>'B0',177=>'B1',178=>'B2',179=>'B3',180=>'B4',181=>'B5',182=>'B6',183=>'B7',184=>'B8',185=>'B9',186=>'BA',187=>'BB',188=>'BC',189=>'BD',190=>'BE',191=>'BF',192=>'C0',193=>'C1',194=>'C2',195=>'C3',196=>'C4',197=>'C5',198=>'C6',199=>'C7',200=>'C8',201=>'C9',202=>'CA',203=>'CB',204=>'CC',205=>'CD',206=>'CE',207=>'CF',208=>'D0',209=>'D1',210=>'D2',211=>'D3',212=>'D4',213=>'D5',214=>'D6',215=>'D7',216=>'D8',217=>'D9',218=>'DA',219=>'DB',220=>'DC',221=>'DD',222=>'DE',223=>'DF',224=>'E0',225=>'E1',226=>'E2',227=>'E3',228=>'E4',229=>'E5',230=>'E6',231=>'E7',232=>'E8',233=>'E9',234=>'EA',235=>'EB',236=>'EC',237=>'ED',238=>'EE',239=>'EF',240=>'F0',241=>'F1',242=>'F2',243=>'F3',244=>'F4',245=>'F5',246=>'F6',247=>'F7',248=>'F8',249=>'F9',250=>'FA',251=>'FB',252=>'FC',253=>'FD',254=>'FE',255=>'FF'};

		string sIn = EncodingUtil.base64Encode(input);
		
		Integer srtIdx = 0;
		string strOut = '';
		for(Integer idx=0; idx < sIn.length()-4; idx+=4){
			strOut += hex.get((base64.get(sIn.substring(idx, idx+1)) << 2) | (base64.get(sIn.substring(idx+1, idx+2)) >>> 4)) 
				    + hex.get(((base64.get(sIn.substring(idx+1, idx+2)) & 15)<<4) | (base64.get(sIn.substring(idx+2, idx+3)) >>> 2)) 
				    + hex.get(((base64.get(sIn.substring(idx+2, idx+3)) & 3)<<6) | base64.get(sIn.substring(idx+3, idx+4)));
		}

		if(sIn.substring(sIn.length()-1, sIn.length()) != '='){
			Integer idx = sIn.length() - 4;
			strOut += hex.get((base64.get(sIn.substring(idx, idx+1)) << 2) | (base64.get(sIn.substring(idx+1, idx+2)) >>> 4)) 
				    + hex.get(((base64.get(sIn.substring(idx+1, idx+2)) & 15)<<4) | (base64.get(sIn.substring(idx+2, idx+3)) >>> 2)) 
				    + hex.get(((base64.get(sIn.substring(idx+2, idx+3)) & 3)<<6) | base64.get(sIn.substring(idx+3, idx+4)));
			
		} else if(sIn.substring(sIn.length()-2, sIn.length()-1) != '='){
			Integer idx = sIn.length() - 4;
			strOut += hex.get((base64.get(sIn.substring(idx, idx+1)) << 2) | (base64.get(sIn.substring(idx+1, idx+2)) >>> 4)) 
				    + hex.get(((base64.get(sIn.substring(idx+1, idx+2)) & 15)<<4) | (base64.get(sIn.substring(idx+2, idx+3)) >>> 2)); 
			
		} else{
			Integer idx = sIn.length() - 4;
			strOut += hex.get((base64.get(sIn.substring(idx, idx+1)) << 2) | (base64.get(sIn.substring(idx+1, idx+2)) >>> 4)); 
		}
		return strOut;
	}