| /* |
| $NiH: zip_file_get_offset.c,v 1.2 2004/04/14 14:01:24 dillo Exp $ |
| |
| zip_file_get_offset.c -- get offset of file data in archive. |
| Copyright (C) 1999, 2003, 2004 Dieter Baron and Thomas Klausner |
| |
| This file is part of libzip, a library to manipulate ZIP archives. |
| The authors can be contacted at <nih@giga.or.at> |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions |
| are met: |
| 1. Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| 2. Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in |
| the documentation and/or other materials provided with the |
| distribution. |
| 3. The names of the authors may not be used to endorse or promote |
| products derived from this software without specific prior |
| written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS |
| OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY |
| DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
| GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER |
| IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN |
| IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <errno.h> |
| #include <unistd.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| |
| #include "zip.h" |
| #include "zipint.h" |
| |
| |
| |
| /* _zip_file_get_offset(za, ze): |
| Returns the offset of the file data for entry ze. |
| |
| On error, fills in za->error and returns 0. |
| */ |
| |
| unsigned int |
| _zip_file_get_offset(struct zip *za, int idx) |
| { |
| struct zip_dirent de; |
| unsigned int offset; |
| |
| offset = za->cdir->entry[idx].offset; |
| |
| if (fseek(za->zp, offset, SEEK_SET) != 0) { |
| _zip_error_set(&za->error, ZIP_ER_SEEK, errno); |
| return 0; |
| } |
| |
| if (_zip_dirent_read(&de, za->zp, NULL, 0, 1, &za->error) != 0) |
| return 0; |
| |
| offset += LENTRYSIZE + de.filename_len + de.extrafield_len; |
| |
| _zip_dirent_finalize(&de); |
| |
| return offset; |
| } |