libslz
indexed_gzip
| libslz | indexed_gzip | |
|---|---|---|
| 1 | 2 | |
| 26 | 93 | |
| - | - | |
| 5.0 | 8.3 | |
| 10 months ago | 6 months ago | |
| C | C | |
| GNU General Public License v3.0 or later | GNU General Public License v3.0 or later |
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libslz
indexed_gzip
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How Much Faster Is Making a Tar Archive Without Gzip?
Pragzip actually decompress in parallel and also access at random. I did a Show HN here: https://news.ycombinator.com/item?id=32366959
indexed_gzip https://github.com/pauldmccarthy/indexed_gzip can also do random access but is not parallel.
Both have to do a linear scan first though. The implementations however can do the linear scan on-demand, i.e., they scan only as far as needed.
bzip2 works very well with this approach. xz only works with this approach when compressed with multiple blocks. Similar is true for zstd.
For zstd, there also exists a seekable variant, which stores the block index at the end as metadata to avoid the linear scan. indexed_zstd offers random access to those files https://github.com/martinellimarco/indexed_zstd
I wrote pragzip and also combined all of the other random access compression backends in ratarmount to offer random access to TAR files that is magnitudes faster than archivemount: https://github.com/mxmlnkn/ratarmount
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Is there any windows archival software (free or paid) that can browse tar.gz files without extracting the whole tarball?
The pieces are there. https://github.com/devsnd/tarindexer/blob/master/tarindexer.py is a prototype of indexing and seeking a tar file in python. https://github.com/pauldmccarthy/indexed_gzip allows indexing and seeking a gzip file. If those pieces of code were combined it could give you efficient targeted file extraction, but you'd need to find a coder with enough time and motivation to fuss with it.
What are some alternatives?
rapidgzip - Gzip Decompression and Random Access for Modern Multi-Core Machines
tarindexer - python module for indexing tar files for fast access
brotli - Brotli compression format
zstd - Zstandard - Fast real-time compression algorithm
indexed_zstd - A bridge for libzstd-seek to python. Based on mxmlnkn/indexed_bzip2
isa-l - Intelligent Storage Acceleration Library