Hi, everybody, I need to add 6 bytes to my NSData

steps:

1. write into NSData

NSData *data = [NSData dataWithBytes:(const char*)&packet 
length:sizeof(packet)];

2. read from NSData
3. In loop i need to add 6 bytes
4. And again wtite into NSData

first step i did, and from 2 to 4 i dont know how to do. Anybody could help me? 
Thanks in advance!


      
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