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+PhysicsFS is a library to provide abstract access to various archives.
+It is intended for use in video games, and the design was somewhat
+inspired by Quake 3's file subsystem. The programmer defines a "write
+directory" on the physical filesystem. No file writing done through the
+PhysicsFS API can leave that write directory, for security. For example,
+an embedded scripting language cannot write outside of this path if it
+uses PhysFS for all of its I/O, which means that untrusted scripts can
+run more safely. Symbolic links can be disabled as well, for added
+safety. For file reading, the programmer lists directories and archives
+that form a "search path". Once the search path is defined, it becomes
+a single, transparent hierarchical filesystem. This makes for easy
+access to ZIP files in the same way as you access a file directly on the
+disk, and it makes it easy to ship a new archive that will override a
+previous archive on a per-file basis. Finally, PhysicsFS gives you
+platform-abstracted means to determine if CD-ROMs are available, the
+user's home directory, where in the real filesystem your program is
+running, etc.
+
+WWW: http://icculus.org/physfs/