//
//  NSData+hexString.m
//  TextSecureKit
//
//  Created by Frederic Jacobs on 28/10/14.
//  Copyright (c) 2014 Open Whisper Systems. All rights reserved.
//

#import "NSData+hexString.h"

@implementation NSData (hexString)

- (NSString *)hexadecimalString {
    /* Returns hexadecimal string of NSData. Empty string if data is empty. */
    const unsigned char *dataBuffer = (const unsigned char *)[self bytes];
    if (!dataBuffer)
        return [NSString string];

    NSUInteger dataLength      = [self length];
    NSMutableString *hexString = [NSMutableString stringWithCapacity:(dataLength * 2)];

    for (NSUInteger i = 0; i < dataLength; ++i) {
        [hexString appendFormat:@"%02x", dataBuffer[i]];
    }
    return [NSString stringWithString:hexString];
}

@end