PhotoRec: recover .xar archives

src/Makefile.am

@@ -309,6 +309,7 @@ file_C			= filegen.c \
 			  file_wtv.c \
 			  file_wv.c \
 			  file_x3f.c \
+			  file_xar.c \
 			  file_xcf.c \
 			  file_xfi.c \
 			  file_xfs.c \

src/file_list.c

@@ -313,6 +313,7 @@ extern const file_hint_t file_hint_wpd;
 extern const file_hint_t file_hint_wtv;
 extern const file_hint_t file_hint_wv;
 extern const file_hint_t file_hint_x3f;
+extern const file_hint_t file_hint_xar;
 extern const file_hint_t file_hint_xcf;
 extern const file_hint_t file_hint_xfi;
 extern const file_hint_t file_hint_xfs;
@@ -612,6 +613,7 @@ file_enable_t list_file_enable[]=
   { .enable=0, .file_hint=&file_hint_wtv  },
   { .enable=0, .file_hint=&file_hint_wv   },
   { .enable=0, .file_hint=&file_hint_x3f  },
+  { .enable=0, .file_hint=&file_hint_xar  },
   { .enable=0, .file_hint=&file_hint_xcf  },
   { .enable=0, .file_hint=&file_hint_xfi  },
   { .enable=0, .file_hint=&file_hint_xfs  },

src/file_xar.c

@@ -0,0 +1,78 @@
+/*
+
+    File: file_xar.c
+
+    Copyright (C) 2015 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_xar(file_stat_t *file_stat);
+
+const file_hint_t file_hint_xar= {
+  .extension="xar",
+  .description="xar archive",
+  .max_filesize=PHOTOREC_MAX_FILE_SIZE,
+  .recover=1,
+  .enable_by_default=1,
+  .register_header_check=&register_header_check_xar
+};
+
+struct xar_header
+{
+  uint32_t magic;
+  uint16_t size;
+  uint16_t version;
+  uint64_t toc_length_compressed;
+  uint64_t toc_length_uncompressed;
+  uint32_t cksum_alg;
+  /* A nul-terminated, zero-padded to multiple of 4, message digest name
+   * appears here if cksum_alg is 3 which must not be empty ("") or "none".
+   */
+};
+
+static int header_check_xar(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 xar_header *hdr=(const struct xar_header *)buffer;
+  if(be16(hdr->version) > 1)
+    return 0;
+  if(be16(hdr->size) < 28)
+    return 0;
+  if(be16(hdr->cksum_alg)==3 && (be16(hdr->size) <32 ||be16(hdr->size)%4!=0))
+    return 0;
+  if(be16(hdr->cksum_alg)>3)
+    return 0;
+  reset_file_recovery(file_recovery_new);
+  file_recovery_new->extension=file_hint_xar.extension;
+  file_recovery_new->min_filesize=be16(hdr->size) + be64(hdr->toc_length_compressed);
+  return 1;
+}
+
+static void register_header_check_xar(file_stat_t *file_stat)
+{
+  register_header_check(0, "xar!", 4, &header_check_xar, file_stat);
+}