A question about dictzip!

keika · 04-02-2009, 03:02 AM

hi.all!
I use dictzip to compress the .dict file,and I would like to know the difference between gzip and dictzip.

I googled dictzip and I found the following:
dictzip" uses the same compression algorithm and file format as does gzip, but provides a table that can be used to randomly access compressed blocks in the file. The use of 50-64kB blocks for compression typically degrades compression by less than 10%, while maintaining acceptable random access capabilities for all data in the file. As an added benefit, files compressed with dictzip can be decompressed with gunzip.

but when I decompress the .dict.dz file.there is only one .dict file,no table.

Can anyone tell me where I can get the table generated by dictzip?

knudfl · 04-04-2009, 11:27 AM

A short, but slightly different description :
http://packages.debian.org/lenny/dictzip

Quote:

dictzip compresses files using the gzip(1) algorithm (LZ77) in a manner
which is completely compatible with the gzip file format. An extension
to the gzip file format allows for random access to chunks of about 57kb
without the overhead of decompressing the entire file. This package also
includes dictunzip to decompress dictzipped files and dictzcat for
viewing dictzipped files.

The "long" version
http://man.root.cz/1/dictzip/
.......
The table is used only to allow you to decompress a fraction
of the file, and the table itself will not be unpacked.
.......
Finding more : Google .. dictzip ..
.......

keika · 04-07-2009, 01:25 AM

thanks knudfl!