If you've got an RTOS with pre-emptive threading, you can do blocking (de)compression safely...but then you need extra memory for another thread stack. It's a

If you've got an RTOS with pre-emptive threading, you can do blocking (de)compression safely...but then you need extra memory for another thread stack. It's a good implementation if that isn't an issue, but then there's a couple tiny LZSS/LZW/etc. implementations available.