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This item should probably not be listed on this page since it's not a programming library or the like. However, if you develop or maintain DOS games that need to run in a DOS box on Windows NT, 2000, XP, you might find this soundcard emulator useful. It emulates an MPU-401 interface (for MIDI), a SoundBlaster compatible soundcard (SB16, SBPro 2, SB2, SBPro, etc) and a standard game-port. The beauty of this emulator is that independent of the user's audio hardware; it works with any soundcard and even on systems that do not have a soundcard. The emulator is free, released under the GNU General Public License and comes with source code.
libmspack is a library that allows your programs to handle the compression and decompression of various archives used by Microsoft in its programs (ie, it handles the file formats used by compress.exe, Microsoft Help, Microsoft Cabinet (CAB), HTML Help, Microsoft eBook). The library is licensed under the GNU LGPL. I'm not sure how portable the library is, but since its distribution package (at the time I write this) is a gzipped tar ball (ie, *.tar.gz), I assume it at least works under some Unix system or clone.
TurboPower's Abbrevia allows your applications to handle various industry standard compression and archiving methods - PKZIP (including PKZIP4), Microsoft CAB, tar, and gzip. There are CLX, VCL and COM components, allowing you to use it with Delphi (Windows), Kylix (Linux), C++Builder and any tool that can interface with COM objects (such as Microsoft Visual Basic, etc). The components also support ZIP files that span multiple archive files, self-extracting ZIP files, comments in ZIP files, integrity checks on ZIP files, etc.
ZipArchive is a C++ library that allows you to add zip archiving support to your applications. You can zip (compress) files, unzip (uncompress) or extract them, create zip archives, handle multi-disk archives, add password encryption and decryption to your zip files, create self-extracting archives, etc. It also supports the Java Archive File (jar files). It comes complete with the source code and is released under the GNU General Public License. Compilers supported include Microsoft Visual C++ on Windows, Borland C++ (Windows), and GNU gcc on Linux.
Unrarlib (Archiving and Compression) This library allows you to read files from RAR archives created with RAR and WinRAR. It supports decompression and decryption, and the library code is statically linked with your application (no external DLLs). Supported operating systems include Win32, SunOS and Linux. It is available (at the time of this writing) under two licenses (at your option), the GNU GPL as well as another that allows you to integrate the library in your application without providing source code.
UCL Portable Lossless Compression Library UCL is a portable lossless data compression library. It is available in ANSI C source code form under the GNU GPL. The author claims that the decompression is simple, extremely fast and requires no memory. The decompression code can be squeezed into 200 bytes of code. It looks like it is a good candidate if you are writing applications that must execute in tight memory conditions, and don't mind releasing the source code for your application (which is required by the GNU General Public License).
Bzip2 Lossless Compression Library Bzip2 is a portable, patent-free, lossless data compression program and library (libbzip2). The author claims that it runs on "practically every (32bit/64bit) platform in the known universe" (including of course Linux and Windows). It is based on the Burrows-Wheeler transform and comes with a BSD-style licence. Full source code is available, along with pre-compiled binaries for a number of operating systems.
ZLIB Compression Library (PKZIP/GZIP Compression) This is an excellent free C library that allows you to compress and decompress any buffer or file using the inflate/deflate method used by PKZIP, InfoZIP and others. As far as I can tell, you can use the code in the library freely in your programs without paying a cent in royalties. The library is apparently used in the Java archiver, jar. You can use this library on a large number of systems, including Win16, Win32, Linux, Unix, MSDOS, etc.
Available at this site are DLL's, VCL's, examples and full source code for Borland's C++ Builder and Delphi that allows you to make PKZIP compatible ZIP archives from within your application. The source code is also available and licensed under the GNU LGPL. A port of this Windows library is planned (at the time of this writing) for the Linux/Kyrix platform as well.
DjVuLibre Document and Image Compression Library DjVu is a compression library specifically designed for images, digital documents and scanned documents. It was originally developed by AT&T. DjVuLibre is the open source implementation, released under GPL and includes various utilities (decoders, encoders, browser plugins, viewers). Precompiled binaries can be found for Linux, Irix and Solaris.
A compression library with source code released under the GNU General Public License. Its purported advantage over zlib (see elsewhere on this page) is that it is fast and has a small memory footprint. An even smaller memory footprint version, called miniLZO is also available, allowing you to include compression in your applications at the cost of a very small increase in executable size (about 6kb on an i386, according to the website).
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