![]() ![]() LZMA compression within the ZIP archive allows ZIP containers to contain LZMA compressed entries. LZMA uses a dictionary compression algorithm, the compressed stream is a stream of bits. There are no obvious drawbacks to mention.īesides providing a high compression level, 7zX gives you the possibility of archiving your files quickly and in a comfortable manner. The LempelZivMarkov chain algorithm (LZMA) is an algorithm used to perform lossless data compression. 7zX archives can include file metadata as well and they can be extracted on any Mac. The application lets you choose from different compression levels, password-protect your archives and make them self extracting. The best part is that 7zX archives can be extracted on any Mac, even if it doesn't have the application installed.įiles can be compressed by simply dragging and dropping them over the 7zX icon. For example, compressed files will retain their metadata, so it will be available at all times, regardless if you extract the files on your own Mac or on a different one. ![]() If your settings are in order, you can hit the OK button, on the same window and the application will do the rest.ħzX provides many other advantages. Usually 7zX compresses to 7z format 30-70 better than to. Compression ratio results are very dependent upon the data used for the tests. What's more, you can decide to preserve the Macintosh resource forks and to make the archive self-extracting. 7zX is a file archiver with high compression ratio. 7zX is a file archiver with high compression ratio. The application lets you choose a compression level, set a volume size, protect the archive with a password and type in additional parameters. ![]() This will bring up a new window, on which you can make a few basic settings. Usually 7zX compresses to 7z format 30-70 better than to zip format, and 2-10 better than most of other zip compatible programs. The application works through drag and drop, so you only need to drag a selection of files or a folder and drop it over the 7zX icon. 7zX is a file archiver with high compression ratio. dmg file directly on your desktop or on your dock. 7zX is a file archiver with high compression ratio. ![]() It gives you the possibility of compressing files at a moment's notice, with only a few clicks. If you are not satisfied with the operating system's Stuff Expander, you can turn to this smart and powerful application. 7zX brings this efficient functionality to Mac OS X. Files can be compressed and extracted without interacting with a complex user interface and it doesn't take long to complete the operations. What's more, 7Zip is a very straight forward compression utility. Is written properly If I make input.dat larger than the buffer (16M) so that archive_write_data() is called at least twice, then a proper file is written.Besides RAR and ZIP, 7Zip is another archive format that offers a high compression ratio. This also doesn't seem to decompress with 7z. I have also tried runningīin/bsdtar -cf output_bsdtar.7z -format 7zip -options 7zip:compression=lzma2 input.dat However, in all these cases I can't decompress the output file with the "7z" command line too. If I make my internal buffer (buff) any size smaller than the input size then the output file size changes to something more reasonable. So, if I make input.dat 8M (from /dev/random) then only 122981 bytes are written. Return write_archive("output.7z", "input.dat") Write_archive(const char *outname, const char *filename)Īrchive_write_set_format_option(a, "7zip", "compression", "lzma2") Īrchive_entry_set_pathname(entry, filename) Īrchive_entry_set_size(entry, st.st_size) // Note 3Īrchive_entry_set_filetype(entry, AE_IFREG) One issue I have found is that if archive_write_data() is only called once with a buffer of the size set in the archive_entry_set_size() call, then only 122981 bytes are output for any large input size. I think this may be a bug in the 7z writer. I'm trying to create a 7zip archive with lzma2 compression and I am having trouble. ![]()
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