bzip2 and gzip internals (was: Compressing packages with bzip2 instead gzip?)

Paul Sladen ubuntu at
Thu Jan 19 10:07:43 GMT 2006

On Thu, 19 Jan 2006, John C. McCabe-Dansted wrote:
> On Thursday 19 January 2006 06:04, Phillip Susi wrote:
> > > Zsync can be taught that restart points occur every 900kB,
> > The data stream DOESN'T restart every 900 KB,

The advantage of Free Software is that you get the source code...

> > That's what gzip --rsyncable does,

"--rsync" resets the gzip stream everytime the rolling checksum equals zero,
as such it is not a fixed period.

> with a block compressor there would most likely be changes in every
> block, meaning that zsync would have to download every block.

Meaning that zsync would only have to download *the complete block* covering
anything that it has not found locally.


Mmm, should we take this off-list?
This country is covered in white fluffy snow.  Helsinki, FI

More information about the ubuntu-devel mailing list