-[NSData initWithBytesNoCopy: length: freeWhenDone:]

[xcvista]

You can use -[NSData initWithBytesNoCopy: length: freeWhenDone:] method to avoid an unneeded memory copy and free(), like the following.

- (id)initWithBase64String:(NSString *)aString
{
    NSData *data = [aString dataUsingEncoding:NSASCIIStringEncoding];
    size_t outputLength;
    void *outputBuffer = NewBase64Decode([data bytes], [data length], &outputLength);
    return [self initWithBytesNoCopy:outputBuffer length:outputLength freeWhenDone:YES];
}

[Antson21]

• (id)initWithBase64String:(NSString *)aString
  {
  NSData *data = [aString dataUsingEncoding:NSASCIIStringEncoding];
  size_t outputLength;
  void *outputBuffer = NewBase64Decode([data bytes], [data length], &outputLength);
  return [self initWithBytesNoCopy:outputBuffer length:outputLength freeWhenDone:YES];
  }