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zzip_disk_init

NAME

zzip_disk_mmap, zzip_disk_init, zzip_disk_new, zzip_disk_munmap, zzip_disk_open, zzip_disk_close - turn a filehandle into a mmapped zip disk archive handle

SYNOPSIS

 #include <zzip/mmapped.h>
 

zzip__new__ ZZIP_DISK* zzip_disk_mmap((int fd));

int zzip_disk_init((ZZIP_DISK* disk, void* buffer, zzip_size_t buflen));

zzip__new__ ZZIP_DISK* zzip_disk_new((void));

int zzip_disk_munmap((ZZIP_DISK* disk));

ZZIP_DISK* zzip__new__ zzip_disk_open((char* filename));

int zzip_disk_close((ZZIP_DISK* disk));

DESCRIPTION

The zzip_disk_mmap function uses the given file-descriptor to detect the length of the file and calls the system mmap(2) to put it in main memory. If it is successful then a newly allocated ZZIP_DISK* is returned with disk->buffer pointing to the mapview of the zipdisk content.

The zzip_disk_init function does primary initialization of a disk-buffer struct.

The zzip_disk_new function allocates a new disk-buffer with malloc(3)

The zzip_disk_munmap function is the inverse of zzip_disk_mmap and using the system munmap(2) on the buffer area and free(3) on the ZZIP_DISK structure.

The zzip_disk_open function opens the given archive by name and turn the filehandle to zzip_disk_mmap for bringing it to main memory. If it can not be mmap(2)'ed then we slurp the whole file into a newly malloc(2)'ed memory block. Only if that fails too then we return null. Since handling of disk->buffer is ambigous it should not be snatched away please.

The zzip_disk_close function will release all data needed to access a (mmapped) zip archive, including any malloc()ed blocks, sharedmem mappings and it dumps the handle struct as well.

AUTHOR

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Guido Draheim <guidod@gmx.de>

COPYRIGHT

Copyright (c) 2003,2004,2006 Guido Draheim All rights reserved, use under the restrictions of the Lesser GNU General Public License or alternatively the restrictions of the Mozilla Public License 1.1