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 3 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, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23
  24 /*
  25   return a file_id which gives a unique ID for a file given the device and
  26   inode numbers
  27  */
  28 struct file_id file_id_create(SMB_DEV_T dev, SMB_INO_T inode)
  29 {
  30         struct file_id key;
  31         /* the ZERO_STRUCT ensures padding doesn't break using the key as a
  32          * blob */
  33         ZERO_STRUCT(key);
  34         key.devid = dev;
  35         key.inode = inode;
  36         return key;
  37 }
  38
  39 /*
  40   generate a file_id from a stat structure
  41  */
  42 struct file_id file_id_sbuf(const SMB_STRUCT_STAT *sbuf)
  43 {
  44         return file_id_create(sbuf->st_dev, sbuf->st_ino);
  45 }
  46
  47
  48 /*
  49   return True if two file_id structures are equal
  50  */
  51 BOOL file_id_equal(const struct file_id *id1, const struct file_id *id2)
  52 {
  53         return id1->inode == id2->inode && id1->devid == id2->devid;
  54 }
  55
  56 /*
  57   a static string for a file_id structure
  58  */
  59 const char *file_id_static_string(const struct file_id *id)
  60 {
  61         static char buf[32];
  62         snprintf(buf, sizeof(buf), "%llx:%llx",
  63                  (unsigned long long)id->devid,
  64                  (unsigned long long)id->inode);
  65         return buf;
  66 }
  67
  68 /*
  69   a 2nd static string for a file_id structure so we can print 2 at once
  70  */
  71 const char *file_id_static_string2(const struct file_id *id)
  72 {
  73         static char buf[32];
  74         snprintf(buf, sizeof(buf), "%llx:%llx",
  75                  (unsigned long long)id->devid,
  76                  (unsigned long long)id->inode);
  77         return buf;
  78 }
  79
  80 /*
  81   push a 16 byte version of a file id into a buffer
  82  */
  83 void push_file_id_16(char *buf, const struct file_id *id)
  84 {
  85         SIVAL(buf,  0, id->devid&0xFFFFFFFF);
  86         SIVAL(buf,  4, id->devid>>32);
  87         SIVAL(buf,  8, id->inode&0xFFFFFFFF);
  88         SIVAL(buf, 12, id->inode>>32);
  89 }
  90
  91 /*
  92   pul a 16 byte version of a file id from a buffer
  93  */
  94 void pull_file_id_16(char *buf, struct file_id *id)
  95 {
  96         ZERO_STRUCTP(id);
  97         id->devid  = IVAL(buf,  0);
  98         id->devid |= ((uint64_t)IVAL(buf,4))<<32;
  99         id->inode  = IVAL(buf,  8);
 100         id->inode |= ((uint64_t)IVAL(buf,12))<<32;
 101 }