1. Jens Alfke
  2. MYUtilities


MYUtilities / MYChecksum.h

//  MYChecksum.h
//  MYUtilities
//  Created by Jens Alfke on 7/3/10.
//  Copyright 2010 Jens Alfke. All rights reserved.

#import <Foundation/NSData.h>

/** NSData add-ons for generating and checking Adler32 checksums/digests/hashes.
    From the ZLib documentation: "An Adler-32 checksum is almost as reliable as a CRC32
    but can be computed much faster."
    Using this category requires linking against libz.dylib. */
@interface NSData (MYChecksum)

/** Computes the Adler32 checksum/digest/hash of the data. */
- (UInt32) my_adler32;

/** Updates a running Adler32 checksum/digest/hash with this data. */
- (UInt32) my_adler32: (UInt32)prevAdler32;