src/libcaptive/client/lib.c

   1 /* $Id$
   2  * captive vfs utility functions for interface to reactos
   3  * Copyright (C) 2002-2003 Jan Kratochvil <project-captive@jankratochvil.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; exactly version 2 of June 1991 is required
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19
  20 #include "config.h"
  21
  22 #include "lib.h"        /* self */
  23 #include <libgnomevfs/gnome-vfs-result.h>
  24 #include <glib/gmessages.h>
  25 #include "captive/macros.h"
  26 #include "reactos/ntos/rtl.h"   /* for InitializeObjectAttributes() */
  27 #include "captive/unicode.h"
  28 #include <libgnomevfs/gnome-vfs-utils.h>        /* for gnome_vfs_unescape_string() */
  29 #include "captive/options.h"
  30 #include <glib/gstrfuncs.h>
  31
  32
  33 /* Returns: g_malloc() allocated absolute pathname string */
  34 gchar *captive_path_normalize(const gchar *raw_pathname)
  35 {
  36 gchar *r,*r_end,*s,*d;
  37
  38         g_return_val_if_fail(raw_pathname!=NULL,NULL);
  39         g_return_val_if_fail(g_path_is_absolute(raw_pathname),NULL);
  40
  41         r=g_strdup(raw_pathname);
  42
  43         /* coalesce '/'es */
  44         for (d=s=r;*s;s++) {
  45                 if (*s==G_DIR_SEPARATOR && d>r && d[-1]==G_DIR_SEPARATOR)
  46                         continue;
  47                 *d++=*s;
  48                 }
  49         g_assert(d>r);
  50         if (d>(r+1) && d[-1]==G_DIR_SEPARATOR)
  51                 d--;
  52         *d++=G_DIR_SEPARATOR;
  53         r_end=d;
  54
  55         /* 'r' is NOT NULL-terminated here! */
  56
  57         for (d=s=r+1;s<r_end;) {
  58                 if (!strncmp(s-1,"/./",3)) {
  59                         s+=2;
  60                         continue;
  61                         }
  62                 if (!strncmp(s-1,"/../",4)) {
  63                         s+=3;
  64                         g_assert(d[-1]==G_DIR_SEPARATOR);
  65                         if (d>r+1) {
  66                                 do {
  67                                         d--;
  68                                         } while (d[-1]!=G_DIR_SEPARATOR);
  69                                 }
  70                         continue;
  71                         }
  72                 *d++=*s++;
  73                 }
  74         g_assert(d[-1]==G_DIR_SEPARATOR);       /* trailing '/' */
  75         if (d>r+1)      /* leave at least "/" */
  76                 d--;
  77         *d='\0';
  78
  79         g_assert(g_path_is_absolute(r));
  80
  81         return r;
  82 }
  83
  84 /* function will leave g_malloc()ed 'ObjectAttributes->ObjectName'!
  85  */
  86 GnomeVFSResult captive_ObjectAttributes_init(const gchar *pathname,OBJECT_ATTRIBUTES *ObjectAttributes)
  87 {
  88 gchar *w32_path,*s,*d;
  89 const gchar *media_root;
  90 gchar *pathname_normalized;
  91
  92         g_return_val_if_fail(pathname!=NULL,GNOME_VFS_ERROR_BAD_PARAMETERS);
  93         g_return_val_if_fail(ObjectAttributes!=NULL,GNOME_VFS_ERROR_BAD_PARAMETERS);
  94
  95         /* Do not open "\Cdfs"(anything) as it is just the filesystem implementation.
  96          * ntoskrnl/io/fs.c/IoMountVolume() will map
  97          *  FILE_DEVICE_CD_ROM -> FILE_DEVICE_CD_ROM_FILE_SYSTEM
  98          * for us automatically when opening the device itself.
  99          * If you put some trailing content (such as "\\.") there
 100          *  IoCreateFile()->ObCreateObject()->ObFindObject()
 101          * will not leave 'ObCreateObject::RemainingPath' as NULL
 102          * and later IopCreateFile() would not consider it FO_DIRECT_DEVICE_OPEN (e.g. w/o any direct mount!).
 103          * On the other side it will somehow get managed automatically and it works even
 104          * without the trailing "\\." for root directory open - don't ask me why. :-)
 105          * Tested: \\Device\\CaptiveHarddisk0\\. FAIL
 106          *         \\Device\\CaptiveHarddisk0\\  OK
 107          */
 108         switch (captive_options->media) {
 109                 case CAPTIVE_OPTION_MEDIA_CDROM: media_root="\\Device\\CdRom0";           break;        /* libcaptive/storage/cdrom.c */
 110                 case CAPTIVE_OPTION_MEDIA_DISK:  media_root="\\Device\\CaptiveHarddisk0"; break;        /* libcaptive/storage/disk.c */
 111                 default:
 112                         g_assert_not_reached();
 113                         media_root="";
 114                 }
 115
 116         pathname_normalized=captive_path_normalize(pathname);
 117         w32_path=(gchar *)/* de-const it as we can modify it but we must not free() it */
 118                         captive_printf_alloca("%s\\%s",media_root,pathname_normalized);
 119         g_free(pathname_normalized);
 120         /* translate '/' -> '\' */
 121         for (s=w32_path;(s=strchr(s,'/'));s++)
 122                 *s='\\';
 123         /* collapse multiple sequences of '\' as it is a no-no for W32 */
 124         for (s=d=w32_path;*s;s++)
 125                 if (d==w32_path || !(*s=='\\' && d[-1]=='\\'))
 126                         *d++=*s;
 127         *d=0;
 128         InitializeObjectAttributes(
 129                         ObjectAttributes,       /* InitializedAttributes */
 130                         captive_utf8_to_UnicodeString_malloc(w32_path), /* ObjectName */
 131                         0,      /* Attributes; I hope no OBJ_KERNEL_HANDLE as we are 'system process' */
 132                         NULL,   /* RootDirectory */
 133                         NULL);  /* SecurityDescriptor; ignored */
 134
 135         return GNOME_VFS_OK;
 136 }