NAME

       zzip_entry_fopen, zzip_entry_ffile, zzip_entry_fread, zzip_entry_fclose, zzip_entry_feof -  open a file
       within a zip disk for reading

SYNOPSIS

       #include <zzip/fseeko.h>

       zzip__new__ ZZIP_ENTRY_FILE *
       zzip_entry_fopen(ZZIP_ENTRY * entry, int takeover)

       zzip__new__ ZZIP_ENTRY_FILE *
       zzip_entry_ffile(FILE * disk, char *filename)

       zzip_size_t
       zzip_entry_fread(void *ptr, zzip_size_t sized, zzip_size_t nmemb,
                        ZZIP_ENTRY_FILE * file)

       int
       zzip_entry_fclose(ZZIP_ENTRY_FILE * file)

       int
       zzip_entry_feof(ZZIP_ENTRY_FILE * file)

DESCRIPTION

        The zzip_entry_fopen function does take an "entry" argument and copies it (or just takes it over as
       owner) to a new ZZIP_ENTRY_FILE handle structure. That structure contains also a zlib buffer for
       decoding. The zzip_entry_fopen function does seek to the file_header of the given "entry" and validates
       it for the data buffer following it. We do also prefetch some data from the data buffer thereby trying to
       match the disk pagesize for faster access later. The zzip_entry_fread will then read in chunks of
       pagesizes which is the size of the internal readahead buffer. If an error occurs then null is returned.

        The zzip_entry_ffile function opens a file found by name, so it does a search into the zip central
       directory with zzip_entry_findfile and whatever is found first is given to zzip_entry_fopen

        The zzip_entry_fread function reads more bytes into the output buffer specified as arguments. The return
       value is null on eof or error, the stdio-like interface can not distinguish between these so you need to
       check with zzip_entry_feof for the difference.

        The zzip_entry_fclose function releases any zlib decoder info needed for decompression and dumps the
       ZZIP_ENTRY_FILE struct then.

        The zzip_entry_feof function allows to distinguish an error from an eof condition. Actually, if we found
       an error but we did already reach eof then we just keep on saying that it was an eof, so the app can just
       continue.

AUTHOR

        Guido Draheim <guidod@gmx.de>

COPYRIGHT

        Copyright (c) Guido Draheim, use under copyleft (LGPL,MPL)

zziplib                                              0.13.72                                 zzip_entry_fopen(3)