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authorChristophe Grenier <grenier@cgsecurity.org>2011-06-17 08:24:05 +0200
committerChristophe Grenier <grenier@cgsecurity.org>2011-06-17 08:24:05 +0200
commit6dfe395579acf62734c3d9484acf0b06f6c82554 (patch)
tree4285790a0ddedf6e5b49e01d97a448908539a1a9 /src/file_oci.c
parent55fbf240bed9ad17dc485fd8d975cbb035237f4c (diff)
PhotoRec: recover .oci OpenCanvas Image
Diffstat (limited to 'src/file_oci.c')
-rw-r--r--src/file_oci.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/src/file_oci.c b/src/file_oci.c
new file mode 100644
index 0000000..8575648
--- /dev/null
+++ b/src/file_oci.c
@@ -0,0 +1,99 @@
+/*
+
+ File: file_oci.c
+
+ Copyright (C) 2011 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_oci(file_stat_t *file_stat);
+
+const file_hint_t file_hint_oci= {
+ .extension="oci",
+ .description="OpenCanvas Image",
+ .min_header_distance=0,
+ .max_filesize=PHOTOREC_MAX_FILE_SIZE,
+ .recover=1,
+ .enable_by_default=1,
+ .register_header_check=&register_header_check_oci
+};
+
+static const unsigned char oci_header[8]= {
+ 'O' , 'P' , 'I' , 'M' , '0' , 0x00, 0x00, 0x00
+};
+
+static int data_check_oci(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 + 8 < file_recovery->file_size + buffer_size/2)
+ {
+ const unsigned int i=file_recovery->calculated_file_size - file_recovery->file_size + buffer_size/2;
+ const unsigned int atom_size=(buffer[i+7]<<24)+(buffer[i+6]<<16)+(buffer[i+5]<<8)+buffer[i+4];
+#ifdef DEBUG_MOV
+ log_trace("file_oci.c: %s atom %c%c%c%c (0x%02x%02x%02x%02x) size %llu, calculated_file_size %llu\n",
+ file_recovery->filename,
+ buffer[i],buffer[i+1],buffer[i+2],buffer[i+3],
+ buffer[i],buffer[i+1],buffer[i+2],buffer[i+3],
+ (long long unsigned)atom_size,
+ (long long unsigned)file_recovery->calculated_file_size);
+#endif
+ if(buffer[i+0]=='O' &&
+ (buffer[i+1]>='A' && buffer[i+1]<='Z') &&
+ (buffer[i+2]>='A' && buffer[i+2]<='Z') &&
+ (buffer[i+3]>='A' && buffer[i+3]<='Z'))
+ {
+ file_recovery->calculated_file_size+=atom_size+8;
+ }
+ else
+ {
+ return 2;
+ }
+ }
+#ifdef DEBUG_MOV
+ log_trace("file_oci.c: new calculated_file_size %llu\n",
+ (long long unsigned)file_recovery->calculated_file_size);
+#endif
+ return 1;
+}
+
+static int header_check_oci(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[0], oci_header, sizeof(oci_header))==0)
+ {
+ reset_file_recovery(file_recovery_new);
+ file_recovery_new->extension=file_hint_oci.extension;
+ file_recovery_new->data_check=data_check_oci;
+ file_recovery_new->file_check=&file_check_size;
+ return 1;
+ }
+ return 0;
+}
+
+static void register_header_check_oci(file_stat_t *file_stat)
+{
+ register_header_check(0, oci_header, sizeof(oci_header), &header_check_oci, file_stat);
+}