SQUASHFS/squashfs-tools-4.4/squashfs-tools/unsquash-34.c

   1 /*
   2  * Unsquash a squashfs filesystem.  This is a highly compressed read only
   3  * filesystem.
   4  *
   5  * Copyright (c) 2019
   6  * Phillip Lougher <phillip@squashfs.org.uk>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * as published by the Free Software Foundation; either version 2,
  11  * or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  21  *
  22  * unsquash-34.c
  23  *
  24  * Helper functions used by unsquash-3 and unsquash-4.
  25  */
  26
  27 #include "unsquashfs.h"
  28
  29 long long *alloc_index_table(int indexes)
  30 {
  31         static long long *alloc_table = NULL;
  32         static int alloc_size = 0;
  33         int length = indexes * sizeof(long long);
  34
  35         if(alloc_size < length || length == 0) {
  36                 long long *table = realloc(alloc_table, length);
  37
  38                 if(table == NULL && length !=0)
  39                         EXIT_UNSQUASH("alloc_index_table: failed to allocate "
  40                                 "index table\n");
  41
  42                 alloc_table = table;
  43                 alloc_size = length;
  44         }
  45
  46         return alloc_table;
  47 }