compression

edit: many thanks for all the answers. Here are the results after applying the optimisations so far: Switching to sorting the characters and run length encoding - new DB size 42M Dropping the indexes on the booleans - new DB size 33M The really nice part is this hasn't required any changes in the iphone code I have an iphone application with a large dictionary held in sqlite format (read only). I'm looking for ideas to reduce the size of the DB file, which is currently very large. Here is the number of entries and resulting size of the sqlite DB: franks-macbook:DictionaryMaker frank$ ls -lh

I was reading about compression in programs and I started to create a new simple project, a zipper (just a zipper, not an unzipper), but I only found zLib, and it's for C. I know that C libraries can be used in C++, but I like to use C++ libraries. Does anyone know a good one to suggest? Best Regards. Most compression libraries that I know of are written in C for two reasons: one, the general age of good compression algorithms; and two, the high portability (and stability) of C across platforms. I suggest any of the following. If you want good licenses select one of the top two, otherwise if

I'm java beginner, I need something like this : String2GzipFile (String file_content, String file_name) String2GzipFile("Lorem ipsum dolor sit amet, consectetur adipiscing elit.", "lorem.txt.gz") I cant figure out how to do that. Jon Skeet There are two orthogonal concepts here: Converting text to binary, typically through an OutputStreamWriter Compressing the binary data, e.g. using GZIPOutputStream So in the end you'll want to: Create an OutputStream which writes to wherever you want the result (e.g. a file or in memory via a ByteArrayOutputStream Wrap that OutputStream in a GZIPOutputStream

I currently have both static and dynamic compression configured. The static compression is working, however the dynamic compression, when checked through YSlow and Fiddler, is not working. In my applicationHost.config, I have the following settings: <urlCompression doStaticCompression="true" doDynamicCompression="true" dynamicCompressionBeforeCache="true" /> <httpCompression directory="%SystemDrive%\inetpub\temp\IIS Temporary Compressed Files" maxDiskSpaceUsage="100" minFileSizeForComp="256"> <scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll" dynamicCompressionLevel="1" />

I have 3 terabyte .gz file and want to read its uncompressed content line-by-line in a C++ program. As the file is quite huge, I want to avoid loading it completely in memory. Can anyone post a simple example of doing it? You most probably will have to use ZLib's deflate, example is available from their site Alternatively you may have a look at BOOST C++ wrapper The example from BOOST page (decompresses data from a file and writes it to standard output) #include <fstream> #include <iostream> #include <boost/iostreams/filtering_streambuf.hpp> #include <boost/iostreams/copy.hpp> #include <boost