zip_extractor.c - libextractor

zip_extractor.c (4262B)
      1 /*
      2  * This file is part of libextractor.
      3  * Copyright (C) 2012 Vidyut Samanta and Christian Grothoff
      4  *
      5  * libextractor is free software; you can redistribute it and/or modify
      6  * it under the terms of the GNU General Public License as published
      7  * by the Free Software Foundation; either version 3, or (at your
      8  * option) any later version.
      9  *
     10  * libextractor is distributed in the hope that it will be useful, but
     11  * WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU General Public License
     16  * along with libextractor; see the file COPYING.  If not, write to the
     17  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  */
     20 /**
     21  * @file plugins/zip_extractor.c
     22  * @brief plugin to support ZIP files
     23  * @author Christian Grothoff
     24  */
     25 #include "platform.h"
     26 #include <ctype.h>
     27 #include "extractor.h"
     28 #include "unzip.h"
     29 
     30 
     31 /**
     32  * Main entry method for the 'application/zip' extraction plugin.
     33  *
     34  * @param ec extraction context provided to the plugin
     35  */
     36 void
     37 EXTRACTOR_zip_extract_method (struct EXTRACTOR_ExtractContext *ec)
     38 {
     39   struct EXTRACTOR_UnzipFile *uf;
     40   struct EXTRACTOR_UnzipFileInfo fi;
     41   char fname[256];
     42   char fcomment[256];
     43 
     44   if (NULL == (uf = EXTRACTOR_common_unzip_open (ec)))
     45     return;
     46   if ( (EXTRACTOR_UNZIP_OK ==
     47         EXTRACTOR_common_unzip_go_find_local_file (uf,
     48                                                    "meta.xml",
     49                                                    2)) ||
     50        (EXTRACTOR_UNZIP_OK ==
     51         EXTRACTOR_common_unzip_go_find_local_file (uf,
     52                                                    "META-INF/MANIFEST.MF",
     53                                                    2)) )
     54   {
     55     /* not a normal zip, might be odf, jar, etc. */
     56     goto CLEANUP;
     57   }
     58   if (EXTRACTOR_UNZIP_OK !=
     59       EXTRACTOR_common_unzip_go_to_first_file (uf))
     60   {
     61     /* zip malformed? */
     62     goto CLEANUP;
     63   }
     64   if (0 !=
     65       ec->proc (ec->cls,
     66                 "zip",
     67                 EXTRACTOR_METATYPE_MIMETYPE,
     68                 EXTRACTOR_METAFORMAT_UTF8,
     69                 "text/plain",
     70                 "application/zip",
     71                 strlen ("application/zip") + 1))
     72     goto CLEANUP;
     73   if (EXTRACTOR_UNZIP_OK ==
     74       EXTRACTOR_common_unzip_get_global_comment (uf,
     75                                                  fcomment,
     76                                                  sizeof (fcomment)))
     77   {
     78     if ( (0 != strlen (fcomment)) &&
     79          (0 !=
     80           ec->proc (ec->cls,
     81                     "zip",
     82                     EXTRACTOR_METATYPE_COMMENT,
     83                     EXTRACTOR_METAFORMAT_C_STRING,
     84                     "text/plain",
     85                     fcomment,
     86                     strlen (fcomment) + 1)))
     87       goto CLEANUP;
     88   }
     89   do
     90   {
     91     if (EXTRACTOR_UNZIP_OK ==
     92         EXTRACTOR_common_unzip_get_current_file_info (uf,
     93                                                       &fi,
     94                                                       fname,
     95                                                       sizeof (fname),
     96                                                       NULL, 0,
     97                                                       fcomment,
     98                                                       sizeof (fcomment)))
     99     {
    100       if ( (0 != strlen (fname)) &&
    101            (0 !=
    102             ec->proc (ec->cls,
    103                       "zip",
    104                       EXTRACTOR_METATYPE_FILENAME,
    105                       EXTRACTOR_METAFORMAT_C_STRING,
    106                       "text/plain",
    107                       fname,
    108                       strlen (fname) + 1)))
    109         goto CLEANUP;
    110       if ( (0 != strlen (fcomment)) &&
    111            (0 !=
    112             ec->proc (ec->cls,
    113                       "zip",
    114                       EXTRACTOR_METATYPE_COMMENT,
    115                       EXTRACTOR_METAFORMAT_C_STRING,
    116                       "text/plain",
    117                       fcomment,
    118                       strlen (fcomment) + 1)))
    119         goto CLEANUP;
    120     }
    121   }
    122   while (EXTRACTOR_UNZIP_OK ==
    123          EXTRACTOR_common_unzip_go_to_next_file (uf));
    124 
    125 CLEANUP:
    126   (void) EXTRACTOR_common_unzip_close (uf);
    127 }
    128 
    129 
    130 /* end of zip_extractor.c */
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