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// NSData+percentageOfSimilarityTo.m
// Doublette
// Created by Uli Kusterer on 30.04.05.
// Copyright 2005 M. Uli Kusterer.
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source
// distribution.
#import "NSData+percentageOfSimilarityTo.h"
@implementation NSData (UKpercentageOfSimilarityTo)
-(float) percentageOfSimilarityTo: (NSData*)otherData
if( [self length] != [otherData length] )
return 0;
int numBytes = [self length], x;
unsigned char * myByte = [self bytes],
* otherByte = [otherData bytes];
float difference = 0;
for( x = 0; x < numBytes; x++ )
difference += fabs((*myByte) -(*otherByte)) / (float)numBytes;
myByte++; otherByte++;
return 1 -difference;
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