Added +[dataFromCString:] and +[dataFromCString:]; much cleanup

NSData+SA_NSDataExtensions.h

@@ -90,6 +90,16 @@
 /** Returns an NSData object containing a blank C string (i.e. a byte sequence
 	of length 1, containing the null character '\0').
  */
-+(NSData *)dataWithBlankCString;
++(NSData *) dataWithBlankCString;
+
+/** Returns an NSData object containing bytes copied from the given C string
+	(sans the null terminator).
+ */
++(NSData *) dataFromCString:(const char *)cString;
+
+/** Returns an NSData object containing the bytes of the given C string
+	(sans the null terminator).
+ */
++(NSData *) dataWithCString:(char *)cString;
 
 @end

NSData+SA_NSDataExtensions.m

@@ -25,59 +25,65 @@
 
 @implementation NSData (SA_NSDataExtensions)
 
--(BOOL)isNullTerminated
-{
+-(BOOL) isNullTerminated {
+	if (self.length == 0)
+		return NO;
+
 	return (((char*) self.bytes)[self.length - 1] == '\0');
 }
 
--(const char *)SA_terminatedCString
-{
+-(const char *) SA_terminatedCString {
 	return self.SA_dataWithTerminatedCString.bytes;
 }
 
--(NSData *)SA_dataWithTerminatedCString
-{
-	if(self.length == 0)
-	{
-		return [NSData dataWithBytes:"\0" length:1];
-	}
-	else if(self.isNullTerminated)
-	{
+-(NSData *) SA_dataWithTerminatedCString {
+	if (self.length == 0) {
+		return [NSData dataWithBytes:"\0" 
+							  length:1];
+	} else if (self.isNullTerminated) {
 		return self;
-	}
-	else
-	{
+	} else {
 		char* terminated_string_buffer = malloc(self.length + 1);
-		[self getBytes:terminated_string_buffer length:self.length];
+		[self getBytes:terminated_string_buffer 
+				length:self.length];
 		terminated_string_buffer[self.length] = '\0';
 		
-		return [NSData dataWithBytesNoCopy:terminated_string_buffer length:(self.length + 1) freeWhenDone:YES];
+		return [NSData dataWithBytesNoCopy:terminated_string_buffer 
+									length:(self.length + 1) 
+							  freeWhenDone:YES];
 	}
 }
 
--(const char *)SA_unterminatedByteString
-{
+-(const char *) SA_unterminatedByteString {
 	return self.SA_dataWithUnterminatedByteString.bytes;
 }
 
--(NSData *)SA_dataWithUnterminatedByteString
-{
-	if(self.length == 0 || self.isNullTerminated == NO)
-	{
+-(NSData *) SA_dataWithUnterminatedByteString {
+	if (self.length == 0 || self.isNullTerminated == NO) {
 		return self;
-	}
-	else
-	{
+	} else {
 		char* unterminated_string_buffer = malloc(self.length - 1);
 		[self getBytes:unterminated_string_buffer length:self.length - 1];
 		
-		return [NSData dataWithBytesNoCopy:unterminated_string_buffer length:(self.length - 1) freeWhenDone:YES];
+		return [NSData dataWithBytesNoCopy:unterminated_string_buffer 
+									length:(self.length - 1) 
+							  freeWhenDone:YES];
 	}
 }
 
-+(NSData *)dataWithBlankCString
-{
-	return [NSData dataWithBytes:"\0" length:1];
++(NSData *) dataWithBlankCString {
+	return [NSData dataWithBytes:"\0" 
+						  length:1];
+}
+
++(NSData *) dataFromCString:(const char *)cString {
+	return [NSData dataWithBytes:cString
+						  length:strlen(cString)];
+}
+
++(NSData *) dataWithCString:(char *)cString {
+	return [NSData dataWithBytesNoCopy:cString
+								length:strlen(cString)];
 }
 
 @end

README.md

@@ -2,6 +2,6 @@ NSData+SA_NSDataExtensions
 
 Adds utility functions to NSData, that help deal with null termination of C strings.
 
-This category on NSData adds properties that allow you to get the null-terminated or non-null-terminated versions of byte arrays stored as NSData objects, and to easily check whether an NSData's byte array is, or is not, null-terminated (that is, whether its last byte is a null).
+This category on NSData adds properties that allow you to get the null-terminated or non-null-terminated versions of byte arrays stored as NSData objects, and to easily check whether an NSData’s byte array is, or is not, null-terminated (that is, whether its last byte is a null).
 
 Copyright (c) 2015 Said Achmiz.