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authorChristophe Grenier <grenier@cgsecurity.org>2011-07-15 07:29:44 +0200
committerChristophe Grenier <grenier@cgsecurity.org>2011-07-15 07:29:44 +0200
commitfcb2816ea33817d6f23ec617c3336a2a74dc04d0 (patch)
treeb2f049f162e1944b0b4a5abc76520eb3e07fb2fa /src/file_hdf.c
parentc2c2ec124c025bde6446cec01fbd272c3fb9e36a (diff)
PhotoRec: recover Hierarchical Data Format 4 .hdf
Diffstat (limited to 'src/file_hdf.c')
-rw-r--r--src/file_hdf.c126
1 files changed, 126 insertions, 0 deletions
diff --git a/src/file_hdf.c b/src/file_hdf.c
new file mode 100644
index 0000000..7217d64
--- /dev/null
+++ b/src/file_hdf.c
@@ -0,0 +1,126 @@
+/*
+
+ File: file_hdf.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_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+#include <stdio.h>
+#include "types.h"
+#include "filegen.h"
+#include "common.h"
+#ifdef DEBUG_HDF
+#include "log.h"
+#endif
+
+static void register_header_check_hdf(file_stat_t *file_stat);
+
+const file_hint_t file_hint_hdf= {
+ .extension="hdf",
+ .description="Hierarchical Data Format 4",
+ .min_header_distance=0,
+ .max_filesize=PHOTOREC_MAX_SIZE_32,
+ .recover=1,
+ .enable_by_default=1,
+ .register_header_check=&register_header_check_hdf
+};
+
+static const unsigned char hdf_header[4]= { 0x0e, 0x03, 0x13, 0x01};
+struct ddh_struct
+{
+ uint16_t size;
+ uint32_t next;
+} __attribute__ ((__packed__));
+
+struct dd_struct
+{
+ uint16_t tag;
+ uint16_t ref;
+ uint32_t offset;
+ uint32_t length;
+} __attribute__ ((__packed__));
+
+static void file_check_hdf(file_recovery_t *file_recovery)
+{
+ unsigned int offset;
+ struct ddh_struct ddh;
+ struct dd_struct *dd=(struct dd_struct *)MALLOC(2*65536);
+ struct dd_struct *p;
+ uint64_t file_size=0;
+ for(offset=4; offset>0; offset=be32(ddh.next))
+ {
+ unsigned int i;
+ if(fseek(file_recovery->handle, offset, SEEK_SET) < 0 ||
+ fread(&ddh, sizeof(ddh), 1, file_recovery->handle) !=1 ||
+ be16(ddh.size)==0 ||
+ fread(dd, 2*be16(ddh.size), 1, file_recovery->handle) !=1)
+ {
+ free(dd);
+ file_recovery->file_size=0;
+ return ;
+ }
+ if(file_size < offset + 2*be16(ddh.size))
+ file_size = offset + 2*be16(ddh.size);
+#ifdef DEBUG_HDF
+ log_info("size=%u next=%lu\n", be16(ddh.size), be32(ddh.next));
+#endif
+ for(i=0, p=dd; i < be16(ddh.size); i++,p++)
+ {
+#ifdef DEBUG_HDF
+ log_info("tag=0x%04x, ref=%u, offset=%lu, length=%lu\n",
+ be16(p->tag), be16(p->ref), be32(p->offset), be32(p->length));
+#endif
+ if(file_size < be32(p->offset) + be32(p->length))
+ file_size = be32(p->offset) + be32(p->length);
+ }
+ }
+ free(dd);
+#ifdef DEBUG_HDF
+ log_info("file_size %llu\n", (long long unsigned)file_size);
+#endif
+ if(file_recovery->file_size < file_size)
+ file_recovery->file_size=0;
+ else
+ file_recovery->file_size = file_size;
+}
+
+static int header_check_hdf(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], hdf_header, sizeof(hdf_header))==0)
+ {
+ reset_file_recovery(file_recovery_new);
+ file_recovery_new->extension=file_hint_hdf.extension;
+ file_recovery_new->file_check=&file_check_hdf;
+ return 1;
+ }
+ return 0;
+}
+
+static void register_header_check_hdf(file_stat_t *file_stat)
+{
+ register_header_check(0, hdf_header, sizeof(hdf_header), &header_check_hdf, file_stat);
+}