PhotoRec: recover Opera preferences .win files

src/Makefile.am

@@ -205,6 +205,7 @@ file_C			= filegen.c \
 			  file_veg.c \
 			  file_vmdk.c \
 			  file_wdp.c \
+			  file_win.c \
 			  file_wks.c \
 			  file_wmf.c \
 			  file_wnk.c \

src/file_list.c

@@ -208,6 +208,7 @@ extern const file_hint_t file_hint_tz;
 extern const file_hint_t file_hint_veg;
 extern const file_hint_t file_hint_vmdk;
 extern const file_hint_t file_hint_wdp;
+extern const file_hint_t file_hint_win;
 extern const file_hint_t file_hint_wks;
 extern const file_hint_t file_hint_wmf;
 extern const file_hint_t file_hint_wnk;
@@ -404,6 +405,7 @@ file_enable_t list_file_enable[]=
   { .enable=0, .file_hint=&file_hint_vmdk },
   { .enable=0, .file_hint=&file_hint_veg  },
   { .enable=0, .file_hint=&file_hint_wdp  },
+  { .enable=0, .file_hint=&file_hint_win  },
   { .enable=0, .file_hint=&file_hint_wks  },
   { .enable=0, .file_hint=&file_hint_wmf  },
   { .enable=0, .file_hint=&file_hint_wnk  },

src/file_win.c

@@ -0,0 +1,95 @@
+/*
+
+    File: file_win.c
+
+    Copyright (C) 2009 Christophe GRENIER <grenier@cgsecurity.org>
+  
+    This software is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+  
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+  
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write the Free Software Foundation, Inc., 51
+    Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+#include <stdio.h>
+#include "types.h"
+#include "filegen.h"
+#include "file_txt.h"
+#include "common.h"
+
+static void register_header_check_win(file_stat_t *file_stat);
+static int header_check_win(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new);
+static int data_check_win(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery);
+
+const file_hint_t file_hint_win= {
+  .extension="win",
+  .description="Opera preferences",
+  .min_header_distance=0,
+  .max_filesize=PHOTOREC_MAX_FILE_SIZE,
+  .recover=1,
+  .enable_by_default=1,
+  .register_header_check=&register_header_check_win
+};
+
+static const unsigned char win_header[31]=  {
+  0xef, 0xbb, 0xbf, 'O' , 'p' , 'e' , 'r' , 'a' ,
+  ' ' , 'P' , 'r' , 'e' , 'f' , 'e' , 'r' , 'e' ,
+  'n' , 'c' , 'e' , 's' , ' ' , 'v' , 'e' , 'r' ,
+  's' , 'i' , 'o' , 'n' , ' ' , '2' , '.' 
+};
+
+static void register_header_check_win(file_stat_t *file_stat)
+{
+  register_header_check(0, win_header, sizeof(win_header), &header_check_win, file_stat);
+}
+
+static int header_check_win(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new)
+{
+  if(memcmp(buffer, win_header, sizeof(win_header))==0)
+  {
+    reset_file_recovery(file_recovery_new);
+    file_recovery_new->extension=file_hint_win.extension;
+    file_recovery_new->data_check=&data_check_win;
+    file_recovery_new->file_check=&file_check_size;
+    return 1;
+  }
+  return 0;
+}
+
+static int data_check_win(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
+{
+  unsigned int i;
+  char *buffer_lower=(char *)MALLOC(buffer_size+16);
+  unsigned int offset=0;
+  if(file_recovery->calculated_file_size==0)
+    offset=3;
+  i=UTF2Lat((unsigned char*)buffer_lower, &buffer[buffer_size/2+offset], buffer_size/2-offset);
+  if(i<buffer_size/2-offset)
+  {
+    if(i>=10)
+      file_recovery->calculated_file_size=file_recovery->file_size+offset+i;
+    free(buffer_lower);
+    return 2;
+  }
+  free(buffer_lower);
+  file_recovery->calculated_file_size=file_recovery->file_size+(buffer_size/2);
+  return 1;
+}