Howto known uncompressed length when uncompress_fd_to_buf

[Sascha Hauer]

On Fri, Nov 30, 2012 at 07:03:36PM +0800, 张忠山 wrote:
> the function uncompress_fd_to_buf has no parameter to return
> the uncompressed length, How to get the uncompressed content
> length?

AFAIK the uncompressed size is not contained in the compressed data 
You would have to uncompress to a file and use this afterwards.
If I understand correctly you want to load a FPGA firmware which you
have in compressed form. What I would do is:

- uncompress the firmware in a script rather than uncompress it from
  C code.
- write a command to flash the firmware.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |