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I want some library (API) to open, seek, read, write ... (in one word to process) gzip files. Is there any open-source cross-platform ones for C or C++?
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If you're interested in the magic of Boost, check out Boost's stream filters which can be arbitrarily combined and cascaded; there's built-in support for gzip, DEFLATE (that's GZip minus the header) and bzip2. Very handy.
Yes. Zlib is the one.
There is also this related question on how to process gzip files more easily and conveniently in C++. The most notable and up to date suggestion seems to be the GZip filters in Boost.IOStreams, which I have good experience with myself.
Yes, sure, zlib is the basic library and it has additional bindings other languages as listed on the webpage as eg gzstream providing a C++ wrapper to the
gz*functions.zlib, being a C-language library, is also extremely portable and cross-platform. See the webpage for links to Solaris, SCO, BeOS, MaxOS, OS/2 (!!), Palm Pilot, Newton (!!), Windows CE (!!), Blackberry, Windows, .Net, ... versions.