First version in git

1 files changed, 80 insertions, 0 deletions

diff --git a/src/file_7z.c b/src/file_7z.c
new file mode 100644
index 0000000..02c0aef
--- /dev/null
+++ b/src/file_7z.c
@@ -0,0 +1,80 @@
+/*
+
+    File: file_7z.c
+
+    Copyright (C) 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"
+#include "common.h"
+
+static void register_header_check_7z(file_stat_t *file_stat);
+static int header_check_7z(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_7z= {
+  .extension="7z",
+  .description="7zip archive file",
+  .min_header_distance=0,
+  .max_filesize=1024*1024,
+  .recover=1,
+  .header_check=&header_check_7z,
+  .register_header_check=&register_header_check_7z
+};
+
+static const unsigned char header_7z[6]  = {'7','z', 0xbc, 0xaf, 0x27, 0x1c};
+struct header_7z {
+  unsigned char signature[6];
+  uint8_t majorversion;
+  uint8_t minorversion;
+  uint32_t crcFromArchive;
+  uint64_t nextHeaderOffset;
+  uint64_t nextHeaderSize;
+  uint64_t nextHeaderCRC;
+} __attribute__ ((__packed__));
+
+static void register_header_check_7z(file_stat_t *file_stat)
+{
+  register_header_check(0, header_7z, sizeof(header_7z), &header_check_7z, file_stat);
+}
+
+static int header_check_7z(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 struct header_7z *buffer_7z=(const struct header_7z *)buffer;
+  if(memcmp(buffer,header_7z,sizeof(header_7z))==0)
+  {
+    reset_file_recovery(file_recovery_new);
+    file_recovery_new->extension=file_hint_7z.extension;
+    file_recovery_new->min_filesize=31;
+    /* Signature size 12 + Start header size 20 */
+    file_recovery_new->calculated_file_size=(uint64_t)le64(buffer_7z->nextHeaderOffset)+
+      le64(buffer_7z->nextHeaderSize) + 12 + 20;
+    file_recovery_new->data_check=&data_check_size;
+    file_recovery_new->file_check=&file_check_size;
+    return 1;
+  }
+  return 0;
+}
+