Minor optimization to msg size counter

lib/utils.js

@@ -607,9 +607,10 @@ function splitMsg(msg) {
 	    msgs        = [],
 	    encoding    = defs.encodings.detect(msg),
 	    totBitCount = bitCount(msg, encoding),
-	    partBitCount,
 	    udh,
-	    i;
+	    i,
+	    i2,
+	    partCharLimit;
 
 	// A single message could contain up to 1120 bits
 	// Return directly if the message fits into that
@@ -626,16 +627,24 @@ function splitMsg(msg) {
 
 	log.silly('larvitsmpp: lib/utils.js: splitMsg() - bundleMsgId set to ' + bundleMsgId);
 
-	i = 0;
+	if (encoding === 'ASCII') {
+		partCharLimit = 153;
+	} else {
+		partCharLimit = 67;
+	}
+
+	i  = 0;
+	i2 = 0;
 	while (msg[i] !== undefined) {
 		msgPart += msg[i];
 
-		partBitCount = bitCount(msgPart, encoding);
+		i2 ++;
 
-		if (partBitCount > 1072) {
+		if (i2 === partCharLimit) {
 			// We've reached the message limit
 
-			log.debug('larvitsmpp: lib/utils.js: splitMsg() - Msg part defined. partBitCount: ' + partBitCount + ' msgPart: "' + msgPart + '"');
+			// Reset the local counter
+			i2 = 0;
 
 			// Add this msgPart minus the last character to the msgs array as an encoded buffer
 			msgs.push(defs.encodings[encoding].encode(msgPart.slice(0, - 1)));