JFFS2 compression
Ferenc Havasi
havasi at inf.u-szeged.hu
Wed Oct 20 07:53:17 EDT 2004
Hi Artem,
> I have several different buffers. I want to compose one JFFS2 node from
> them. As I understand, I need to allocate one big temporary buffer, copy
> my small buffers to it, and then compress the big buffer. After this I
> will be able to uncompress the compression buffer in one step.
>
> But, it would be very very nice if I can compress each small buffer to
> one compression buffer and later be able to uncompress the resulting
> compression buffer in one step. Can I do so?
If the "one step" means that you would like to use only one
jffs2_decompress/... call than the answer is no.
But I can imagine a solution, where you can call jffs2_compress
separatedly for the small buffers, and you can uncompress it using a loop.
The compression buffer can be something like the following:
- original_size_of_small_buffer1
- compressed_size_of_small_buffer1
- comprtype (return value of jffs2_compress)
- compressed data1
- original_size_of_small_buffer2
- compressed_size_of_small_buffer2
- comprtype (return value of jffs2_compress)
- compressed data2
...
I don't know it is OK for you or not.
Bye,
Ferenc
P.S.: In this solution you may have to allign all data to 4 bytes.
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