The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/ntfs/collate.c

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    1 /*
    2  * collate.c - NTFS kernel collation handling.  Part of the Linux-NTFS project.
    3  *
    4  * Copyright (c) 2004 Anton Altaparmakov
    5  *
    6  * This program/include file is free software; you can redistribute it and/or
    7  * modify it under the terms of the GNU General Public License as published
    8  * by the Free Software Foundation; either version 2 of the License, or
    9  * (at your option) any later version.
   10  *
   11  * This program/include file is distributed in the hope that it will be
   12  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
   13  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   14  * GNU General Public License for more details.
   15  *
   16  * You should have received a copy of the GNU General Public License
   17  * along with this program (in the main directory of the Linux-NTFS
   18  * distribution in the file COPYING); if not, write to the Free Software
   19  * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   20  */
   21 
   22 #include "collate.h"
   23 #include "debug.h"
   24 #include "ntfs.h"
   25 
   26 static int ntfs_collate_binary(ntfs_volume *vol,
   27                 const void *data1, const int data1_len,
   28                 const void *data2, const int data2_len)
   29 {
   30         int rc;
   31 
   32         ntfs_debug("Entering.");
   33         rc = memcmp(data1, data2, min(data1_len, data2_len));
   34         if (!rc && (data1_len != data2_len)) {
   35                 if (data1_len < data2_len)
   36                         rc = -1;
   37                 else
   38                         rc = 1;
   39         }
   40         ntfs_debug("Done, returning %i", rc);
   41         return rc;
   42 }
   43 
   44 static int ntfs_collate_ntofs_ulong(ntfs_volume *vol,
   45                 const void *data1, const int data1_len,
   46                 const void *data2, const int data2_len)
   47 {
   48         int rc;
   49         u32 d1, d2;
   50 
   51         ntfs_debug("Entering.");
   52         // FIXME:  We don't really want to bug here.
   53         BUG_ON(data1_len != data2_len);
   54         BUG_ON(data1_len != 4);
   55         d1 = le32_to_cpup(data1);
   56         d2 = le32_to_cpup(data2);
   57         if (d1 < d2)
   58                 rc = -1;
   59         else {
   60                 if (d1 == d2)
   61                         rc = 0;
   62                 else
   63                         rc = 1;
   64         }
   65         ntfs_debug("Done, returning %i", rc);
   66         return rc;
   67 }
   68 
   69 typedef int (*ntfs_collate_func_t)(ntfs_volume *, const void *, const int,
   70                 const void *, const int);
   71 
   72 static ntfs_collate_func_t ntfs_do_collate0x0[3] = {
   73         ntfs_collate_binary,
   74         NULL/*ntfs_collate_file_name*/,
   75         NULL/*ntfs_collate_unicode_string*/,
   76 };
   77 
   78 static ntfs_collate_func_t ntfs_do_collate0x1[4] = {
   79         ntfs_collate_ntofs_ulong,
   80         NULL/*ntfs_collate_ntofs_sid*/,
   81         NULL/*ntfs_collate_ntofs_security_hash*/,
   82         NULL/*ntfs_collate_ntofs_ulongs*/,
   83 };
   84 
   85 /**
   86  * ntfs_collate - collate two data items using a specified collation rule
   87  * @vol:        ntfs volume to which the data items belong
   88  * @cr:         collation rule to use when comparing the items
   89  * @data1:      first data item to collate
   90  * @data1_len:  length in bytes of @data1
   91  * @data2:      second data item to collate
   92  * @data2_len:  length in bytes of @data2
   93  *
   94  * Collate the two data items @data1 and @data2 using the collation rule @cr
   95  * and return -1, 0, ir 1 if @data1 is found, respectively, to collate before,
   96  * to match, or to collate after @data2.
   97  *
   98  * For speed we use the collation rule @cr as an index into two tables of
   99  * function pointers to call the appropriate collation function.
  100  */
  101 int ntfs_collate(ntfs_volume *vol, COLLATION_RULE cr,
  102                 const void *data1, const int data1_len,
  103                 const void *data2, const int data2_len) {
  104         int i;
  105 
  106         ntfs_debug("Entering.");
  107         /*
  108          * FIXME:  At the moment we only support COLLATION_BINARY and
  109          * COLLATION_NTOFS_ULONG, so we BUG() for everything else for now.
  110          */
  111         BUG_ON(cr != COLLATION_BINARY && cr != COLLATION_NTOFS_ULONG);
  112         i = le32_to_cpu(cr);
  113         BUG_ON(i < 0);
  114         if (i <= 0x02)
  115                 return ntfs_do_collate0x0[i](vol, data1, data1_len,
  116                                 data2, data2_len);
  117         BUG_ON(i < 0x10);
  118         i -= 0x10;
  119         if (likely(i <= 3))
  120                 return ntfs_do_collate0x1[i](vol, data1, data1_len,
  121                                 data2, data2_len);
  122         BUG();
  123         return 0;
  124 }

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