Objective-C: Conversion of NetService addresses into human readable IP addresses.

Host.m

//
//  Host.m
//  Dependencies: NSString+HexValue - Source: http://forums.macrumors.com/showthread.php?t=977076
//

#import "Host.h"
#import "NSString+HexValue.h"

#pragma mark
@interface Host()
#pragma mark
- (NSArray*)tokenizedComponentsFromAddressData:(NSData*)data atRange:(NSRange)range;
- (NSString*)formattedStringFromAddressComponents:(NSArray*)addressComponents;
@end




#pragma mark
@implementation Host
#pragma mark

- (id)init {
    self = [super init];
    if (self) {
        m_netServiceAddressesLength16 = [NSMutableArray array];
		m_netServiceAddressesLength28 = [NSMutableArray array];
		m_netServiceAddressesLengthUnkown = [NSMutableArray array];
    }
    return self;
}

- (id)initWithNetServiceAddresses:(NSArray*)netServiceAddresses {
    self = [self init];
    if (self) {
		for (NSData* netServiceAddress in netServiceAddresses) {
			if (netServiceAddress.length == 16) {
				[m_netServiceAddressesLength16 addObject:netServiceAddress];
			}
			else if (netServiceAddress.length == 16) {
				[m_netServiceAddressesLength16 addObject:netServiceAddress];
			}
			else {
				[m_netServiceAddressesLengthUnkown addObject:netServiceAddress];
			}
		}
    }
    return self;
}


- (NSString*)formattedIpAddressV4 {
	// Select the first four bytes address. There could be more, though!
	NSData* addressData = [m_netServiceAddressesLength16 objectAtIndex:0];
	// Tokenize address components into strings.
	// The second component (Bytes 5 till 9) contains the IP address as hexdecimal values.
	NSArray* addressComponents = [self tokenizedComponentsFromAddressData:addressData atRange:NSMakeRange(5, 4)];
	// Convert hexadecimal into integer values and format address.
	return [self formattedStringFromAddressComponents:addressComponents];
}






#pragma mark - Helper

// Returns an array of strings, still in hexadecimal format.
- (NSArray*)tokenizedComponentsFromAddressData:(NSData*)data atRange:(NSRange)range {
	NSMutableArray* result = [NSMutableArray arrayWithCapacity:range.length];
	const char* bytes = [data bytes];
	for (NSUInteger i = range.location; i < range.location + range.length; i++) {
		[result addObject:[NSString stringWithFormat:@"%02hhx", (unsigned char)bytes[i]]];
	}
	return result;
}

// Returns a formatted IP address such as 192.168.23.42.
- (NSString*)formattedStringFromAddressComponents:(NSArray*)addressComponents {
	NSMutableString* formattedAddress = [NSMutableString string];
	for (NSUInteger index = 0; index < addressComponents.count; ++index) {
		NSString* hexString = [addressComponents objectAtIndex:index];
		[formattedAddress appendFormat:@"%d", [hexString hexValue]];
		if (index != addressComponents.count - 1) {
			[formattedAddress appendString:@"."];
		}
	}
	return formattedAddress;
}


@end