Thank you Tommi. I came to the same conclusions. Have also updated a little bit the documentation: https://openzim.org/index.php?title=ZIM_File_Format&diff=568&oldid=5...

Le mar 20/10/09 14:52, "Tommi Mäkitalo" tommi@tntnet.org a écrit:

On Dienstag, 20. Oktober 2009 13:57:08 emmanu el@engelhart.org wrote: Hi,

...

I help currently someone wanting to build his own

ZIM parser. I know this is not necessary... but he wants to do it and I find this is interesting to have someone trying to do that.

...

I have remarked that on the wiki nothing is written

about the compression:

• How do we know if a cluster is compressed or not

?

• What are the possible value (for different

compression methods) ?

...

Regards Emmanuel

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Hi,

unfortunately there are several areas, which are not specified completely. But

luckily this compression flag is at least partly ;-)

The first byte in a cluster specifies the compression. The value is: 0 default (no compression) 1 none (also no compression, I don't know, why vlado specified this in zeno,

but I take ist over to zim)

2 zip (zlib) 3 bzip2 (currently used in writer) 4 lzma (not implemented in reader or writer due to lack of compression

library)

You can find the flag here: http://openzim.org/ZIM_File_Format#Clusters. The

actual values are not documentated but can be found in the header zim/zim.h

as

a enum.

It is really no necessary to implement a parser but it does not hurt. It helps

discussing ideas for improvements. And it helps pushing zim as a standard,

if

we encourage people to work with it.

Tommi