fopenz() and fgunzip() functions allow to read
gzipped files with standard
fread() function from stdio.h.
Write or seek is not supported.
This extension requires ability to virtualize FILE* files. Only Linux (GNU libc)
and BSD are supported. Not tested under BSD. It doesn't depend on zlib.
#include <stdio.h>
FILE *fopenz(const char *name, const char *mode);
FILE *fgunzip(FILE *f);
The file should be fclose()'d before exit
(due to risk of a race condition).
Note: It is possible that fgunzip() will cause unstability within stdio
library (due to use FILE inside a callback).