zlib is a general purpose data compression library written in C.
The library solves the problem of compressing and decompressing data across applications and systems. It implements the deflate compression algorithm and provides support for the zlib, deflate, and gzip formats as defined by their respective RFCs. The code is thread-safe and offers a straightforward API documented in the zlib.h header file, with usage examples provided in the test directory.
Developers should choose zlib for any project requiring reliable, standards-compliant compression. It suits embedded systems, file archiving, network protocols, and any application needing to reduce data size or bandwidth. The library has broad language support through bindings for Java, Python, Perl, and Tcl, making it accessible beyond C and C++ projects. It compiles on Unix-like systems, Windows, VMS, and other platforms, though some historical compiler-specific issues are documented for certain systems.
The project maintains a stable, conservative development approach focused on reliability and compatibility. Bug reports and questions are directed to a dedicated mailing list rather than handled through typical issue channels. The maintainers provide extensive platform-specific guidance and acknowledge known compiler limitations on particular systems, indicating careful attention to real-world deployment scenarios. Unsupported third-party contributions are collected in a contrib directory, allowing experimentation without affecting the core library's stability.
