source/lib/file_id.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    file_id structure handling
   5
   6    Copyright (C) Andrew Tridgell 2007
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (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, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24
  25 /*
  26   return a file_id which gives a unique ID for a file given the device and
  27   inode numbers
  28  */
  29 struct file_id file_id_create(SMB_DEV_T dev, SMB_INO_T inode)
  30 {
  31         struct file_id key;
  32         /* the ZERO_STRUCT ensures padding doesn't break using the key as a
  33          * blob */
  34         ZERO_STRUCT(key);
  35         key.devid = dev;
  36         key.inode = inode;
  37         return key;
  38 }
  39
  40 /*
  41   generate a file_id from a stat structure
  42  */
  43 struct file_id file_id_sbuf(const SMB_STRUCT_STAT *sbuf)
  44 {
  45         return file_id_create(sbuf->st_dev, sbuf->st_ino);
  46 }
  47
  48
  49 /*
  50   return True if two file_id structures are equal
  51  */
  52 BOOL file_id_equal(const struct file_id *id1, const struct file_id *id2)
  53 {
  54         return id1->inode == id2->inode && id1->devid == id2->devid;
  55 }
  56
  57 /*
  58   a static string for a file_id structure
  59  */
  60 const char *file_id_static_string(const struct file_id *id)
  61 {
  62         static char buf[32];
  63         snprintf(buf, sizeof(buf), "%llx:%llx",
  64                  (unsigned long long)id->devid,
  65                  (unsigned long long)id->inode);
  66         return buf;
  67 }
  68
  69 /*
  70   a 2nd static string for a file_id structure so we can print 2 at once
  71  */
  72 const char *file_id_static_string2(const struct file_id *id)
  73 {
  74         static char buf[32];
  75         snprintf(buf, sizeof(buf), "%llx:%llx",
  76                  (unsigned long long)id->devid,
  77                  (unsigned long long)id->inode);
  78         return buf;
  79 }
  80
  81 /*
  82   push a 16 byte version of a file id into a buffer
  83  */
  84 void push_file_id_16(char *buf, const struct file_id *id)
  85 {
  86         SIVAL(buf,  0, id->devid&0xFFFFFFFF);
  87         SIVAL(buf,  4, id->devid>>32);
  88         SIVAL(buf,  8, id->inode&0xFFFFFFFF);
  89         SIVAL(buf, 12, id->inode>>32);
  90 }
  91
  92 /*
  93   pul a 16 byte version of a file id from a buffer
  94  */
  95 void pull_file_id_16(char *buf, struct file_id *id)
  96 {
  97         ZERO_STRUCTP(id);
  98         id->devid  = IVAL(buf,  0);
  99         id->devid |= ((uint64_t)IVAL(buf,4))<<32;
 100         id->inode  = IVAL(buf,  8);
 101         id->inode |= ((uint64_t)IVAL(buf,12))<<32;
 102 }