Just 6 IR codes eg 6 buttons or 6 IR code sets eg for 6 devices.

If just 6 buttons do you know in advance what type of IR codes

eg NEC type, Sony, RC5, RC6 These are the common ones and will cover many items but there are still a lot of codes that do not conform to any of the above.

Panasonic and JVC use codes that are similar to NEC but have subtle differences however the decoding is basically the same once you account for differnt headers and number of bytes in the codes.

A bit moe information on exactly what you are trying to achieve would make it easier to answer your question.

Regards