Hi Tino,
Tino Lange wrote:
Could you add that feature to "l(un)zip" as well?
I could do it. Ddrescue already creates sparse files, so I can copy the
code into lzip.
But, have you considered these alternatives?
1) If compression and sparseness take about the same space, maybe a
sparse file is preferable. (More robust).
2) Using the unix toolbox concept, it can be done even better. The code
for sparse file creation in 'cp' seems pretty optimized:
$ dd if=/dev/zero of=testfile bs=1024 count=1024
$ lzip -k testfile
$ cp --sparse=always <(lzip -cd testfile.lz) cp_lz_testfile
$ xz -c testfile > xz_testfile.xz
$ xz -kd xz_testfile.xz
$ du -h *testfile*
0 cp_lz_testfile
1.1M testfile
1.0K testfile.lz
3.0K xz_testfile
1.0K xz_testfile.xz
Best regards,
Antonio.
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