Back to index

php5  5.3.10
zip_file_get_offset.c
Go to the documentation of this file.
00001 /*
00002   zip_file_get_offset.c -- get offset of file data in archive.
00003   Copyright (C) 1999-2007 Dieter Baron and Thomas Klausner
00004 
00005   This file is part of libzip, a library to manipulate ZIP archives.
00006   The authors can be contacted at <libzip@nih.at>
00007 
00008   Redistribution and use in source and binary forms, with or without
00009   modification, are permitted provided that the following conditions
00010   are met:
00011   1. Redistributions of source code must retain the above copyright
00012      notice, this list of conditions and the following disclaimer.
00013   2. Redistributions in binary form must reproduce the above copyright
00014      notice, this list of conditions and the following disclaimer in
00015      the documentation and/or other materials provided with the
00016      distribution.
00017   3. The names of the authors may not be used to endorse or promote
00018      products derived from this software without specific prior
00019      written permission.
00020  
00021   THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
00022   OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
00023   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00024   ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
00025   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00026   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
00027   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00028   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
00029   IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
00030   OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
00031   IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00032 */
00033 
00034 
00035 
00036 #include <stdio.h>
00037 #include <stdlib.h>
00038 #include <string.h>
00039 #include <errno.h>
00040 #include <sys/types.h>
00041 #include <sys/stat.h>
00042 
00043 #include "zipint.h"
00044 
00045 
00046 
00047 /* _zip_file_get_offset(za, ze):
00048    Returns the offset of the file data for entry ze.
00049 
00050    On error, fills in za->error and returns 0.
00051 */
00052 
00053 unsigned int
00054 _zip_file_get_offset(struct zip *za, int idx)
00055 {
00056     struct zip_dirent de;
00057     unsigned int offset;
00058 
00059     offset = za->cdir->entry[idx].offset;
00060 
00061     if (fseeko(za->zp, offset, SEEK_SET) != 0) {
00062        _zip_error_set(&za->error, ZIP_ER_SEEK, errno);
00063        return 0;
00064     }
00065 
00066     if (_zip_dirent_read(&de, za->zp, NULL, NULL, 1, &za->error) != 0)
00067        return 0;
00068 
00069     offset += LENTRYSIZE + de.filename_len + de.extrafield_len;
00070 
00071     _zip_dirent_finalize(&de);
00072 
00073     return offset;
00074 }