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authorChristophe Grenier <grenier@cgsecurity.org>2007-10-29 22:38:52 +0100
committerChristophe Grenier <grenier@cgsecurity.org>2007-10-29 22:38:52 +0100
commit9928d99936105b4653d2d1b8ca74dc3ffba5c71e (patch)
tree06aa4f5e9f0055027c6fb54dd47a8414cf2fba32 /src/file_mpg.c
First version in git
Diffstat (limited to 'src/file_mpg.c')
-rw-r--r--src/file_mpg.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/src/file_mpg.c b/src/file_mpg.c
new file mode 100644
index 0000000..948d871
--- /dev/null
+++ b/src/file_mpg.c
@@ -0,0 +1,85 @@
+/*
+
+ File: file_mpg.c
+
+ Copyright (C) 1998-2005,2007 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"
+
+
+static void register_header_check_mpg(file_stat_t *file_stat);
+static int header_check_mpg(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);
+
+const file_hint_t file_hint_mpg= {
+ .extension="mpg",
+ .description="Moving Picture Experts Group video",
+ .min_header_distance=0,
+ .max_filesize=PHOTOREC_MAX_FILE_SIZE,
+ .recover=1,
+ .header_check=&header_check_mpg,
+ .register_header_check=&register_header_check_mpg
+};
+
+static const unsigned char mpg_header[3]= {0x00, 0x00, 0x01};
+
+static void register_header_check_mpg(file_stat_t *file_stat)
+{
+ register_header_check(0, mpg_header,sizeof(mpg_header), &header_check_mpg, file_stat);
+}
+
+static int header_check_mpg(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->file_stat!=NULL && file_recovery->file_stat->file_hint==&file_hint_mpg)
+ return 0;
+ /* ISO/IEC 11172/13818-1 SYSTEM MULTIPLEXED PACKETIZED ELEMENTARY *
+ * STREAM AND HEADERS *
+ * 0x000001BA pack header start code *
+ * 0x000001BB system header start code *
+ * 0x000001BE padding block start code *
+ * 0x000001BD private 1 block start code *
+ * 0x000001BF private 2 block start code *
+ * *
+ * ISO/IEC 11172-2/13818-2 (MPEG-1/2 video) ELEMENTARY VIDEO HEADER *
+ * 0x000001B3 video sequence start code *
+ * 0x000001B2 video user meta data start code *
+ * *
+ * ISO/IEC 14496-2 (MPEG-4 video) ELEMENTARY VIDEO HEADER *
+ * 0x000001B0 visual object sequence start code *
+ * 0x000001B2 user meta data start code *
+ * 0x000001B5 visual object start code */
+
+ if(buffer[0]==0x00 && buffer[1]==0x00 && buffer[2]==0x01 &&
+ (buffer[3]==0xB0 || buffer[3]==0xB3 || buffer[3]==0xB5 || buffer[3]==0xBA || buffer[3]==0xBB))
+ {
+ reset_file_recovery(file_recovery_new);
+ file_recovery_new->extension=file_hint_mpg.extension;
+ return 1;
+ }
+ return 0;
+}
+
+