[apple/security.git] / libsecurity_transform / NSData+HexString.m

//
//  NSData+HexString.m
//  libsecurity_transform
//
//  Copyright (c) 2011 Apple, Inc. All rights reserved.
//

#import "NSData+HexString.h"

@implementation NSData (HexString)

// Not efficent
+(id)dataWithHexString:(NSString *)hex
{
	char buf[3];
	buf[2] = '\0';
	NSAssert(0 == [hex length] % 2, @"Hex strings should have an even number of digits (%@)", hex);
	unsigned char *bytes = malloc([hex length]/2);
	unsigned char *bp = bytes;
	for (CFIndex i = 0; i < [hex length]; i += 2) {
		buf[0] = [hex characterAtIndex:i];
		buf[1] = [hex characterAtIndex:i+1];
		char *b2 = NULL;
		*bp++ = strtol(buf, &b2, 16);
		NSAssert(b2 == buf + 2, @"String should be all hex digits: %@ (bad digit around %d)", hex, i);
	}
	
	return [NSData dataWithBytesNoCopy:bytes length:[hex length]/2 freeWhenDone:YES];
}

@end
Commit	Line	Data
b1ab9ed8 A	1	//
	2	// NSData+HexString.m
	3	// libsecurity_transform
	4	//
	5	// Copyright (c) 2011 Apple, Inc. All rights reserved.
	6	//
	7
	8	#import "NSData+HexString.h"
	9
	10	@implementation NSData (HexString)
	11
	12	// Not efficent
	13	+(id)dataWithHexString:(NSString *)hex
	14	{
	15	char buf[3];
	16	buf[2] = '\0';
	17	NSAssert(0 == [hex length] % 2, @"Hex strings should have an even number of digits (%@)", hex);
	18	unsigned char *bytes = malloc([hex length]/2);
	19	unsigned char *bp = bytes;
	20	for (CFIndex i = 0; i < [hex length]; i += 2) {
	21	buf[0] = [hex characterAtIndex:i];
	22	buf[1] = [hex characterAtIndex:i+1];
	23	char *b2 = NULL;
	24	*bp++ = strtol(buf, &b2, 16);
	25	NSAssert(b2 == buf + 2, @"String should be all hex digits: %@ (bad digit around %d)", hex, i);
	26	}
	27
	28	return [NSData dataWithBytesNoCopy:bytes length:[hex length]/2 freeWhenDone:YES];
	29	}
	30
	31	@end