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authorChristophe Grenier <grenier@cgsecurity.org>2014-05-27 22:07:42 +0200
committerChristophe Grenier <grenier@cgsecurity.org>2014-05-27 22:07:42 +0200
commitbf789c2453dc0f006752dfc8f673948458cedd70 (patch)
tree625affbc4d5c31b04a877169867bf67d44067f7f /src/file_dad.c
parent5a49507e65e60d77970bc893636644289789d2c7 (diff)
PhotoRec: recover .dad Micae DVR files
Diffstat (limited to 'src/file_dad.c')
-rw-r--r--src/file_dad.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/src/file_dad.c b/src/file_dad.c
new file mode 100644
index 0000000..b104da3
--- /dev/null
+++ b/src/file_dad.c
@@ -0,0 +1,89 @@
+/*
+
+ File: file_dad.c
+
+ Copyright (C) 2014 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_STRING_H
+#include <string.h>
+#endif
+#include <stdio.h>
+#include "types.h"
+#include "filegen.h"
+#include "common.h"
+#include "log.h"
+
+static void register_header_check_dad(file_stat_t *file_stat);
+
+const file_hint_t file_hint_dad= {
+ .extension="dad",
+ .description="Micae DVR",
+ .min_header_distance=0,
+ .max_filesize=PHOTOREC_MAX_FILE_SIZE,
+ .recover=1,
+ .enable_by_default=1,
+ .register_header_check=&register_header_check_dad
+};
+
+struct dad_header
+{
+ uint32_t magic;
+ uint32_t unk1;
+ uint32_t unk2;
+ uint32_t size;
+} __attribute__ ((__packed__));
+
+static data_check_t data_check_dad(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
+{
+ while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
+ file_recovery->calculated_file_size + 16 <= file_recovery->file_size + buffer_size/2)
+ {
+ const unsigned int i=file_recovery->calculated_file_size - file_recovery->file_size + buffer_size/2;
+ const struct dad_header *dad=(const struct dad_header *)&buffer[i];
+#ifdef DEBUG_DAD
+ log_info("%llu magic %08x => %llu\n",
+ (long long unsigned)file_recovery->calculated_file_size, le32(dad->magic),
+ (long long unsigned)file_recovery->calculated_file_size + le32(dad->size));
+#endif
+ if(dad->magic!=le32(0x56414844) || le32(dad->size)<16)
+ return DC_STOP;
+ file_recovery->calculated_file_size+=le32(dad->size);
+ }
+ return DC_CONTINUE;
+}
+
+static int header_check_dad(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(file_recovery!=NULL && file_recovery->data_check==&data_check_dad &&
+ file_recovery->calculated_file_size==file_recovery->file_size)
+ return 0;
+ reset_file_recovery(file_recovery_new);
+ file_recovery_new->extension=file_hint_dad.extension;
+ file_recovery_new->data_check=&data_check_dad;
+ file_recovery_new->file_check=&file_check_size;
+ return 1;
+}
+
+static void register_header_check_dad(file_stat_t *file_stat)
+{
+ register_header_check(0, "DHAV", 4, &header_check_dad, file_stat);
+}