@implementation NSString (StringToHexData)
//
// Decodes an NSString containing hex encoded bytes into an NSData object
-
(NSData *) stringToHexData
{
int len = [self length] / 2; // Target length
unsigned char *buf = malloc(len)
unsigned char *whole_byte = buf;
char byte_chars[3] = {'\0','\0','\0'};int i;
for (i=0; i < [self length] / 2; i++) {
byte_chars[0] = [self characterAtIndex:i2];
byte_chars[1] = [self characterAtIndex:i2+1];
*whole_byte = strtol(byte_chars, NULL, 16);
whole_byte++;
}NSData *data = [NSData dataWithBytes:buf length:len];
free( buf );
return data;
}
@end
@implementation NSData (DataToHexString)
- (NSString *) dataToHexString
{
NSUInteger len = [self length];
char * chars = (char *)[self bytes];
NSMutableString * hexString = [[NSMutableString alloc] init];
for(NSUInteger i = 0; i < len; i++ )
[hexString appendString:[NSString stringWithFormat:@"%0.2hhx", >chars[i]]];
return hexString;
}
@end
