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authorChristophe Grenier <grenier@cgsecurity.org>2008-02-25 13:52:52 +0100
committerChristophe Grenier <grenier@cgsecurity.org>2008-02-25 13:52:52 +0100
commit2318624110011ec67815d64b62e17ab74678006f (patch)
tree388083b37e1257f049ff45b3b9e90ff265aa8785 /src/file_fcs.c
parentc6a2f962d463125875e1cacdb01d2bb799cbc44d (diff)
PhotoRec: Flow Cytometry Standard 3.0 recovery support
Diffstat (limited to 'src/file_fcs.c')
-rw-r--r--src/file_fcs.c153
1 files changed, 153 insertions, 0 deletions
diff --git a/src/file_fcs.c b/src/file_fcs.c
new file mode 100644
index 0000000..a474223
--- /dev/null
+++ b/src/file_fcs.c
@@ -0,0 +1,153 @@
+/*
+
+ File: file_fcs.c
+
+ Copyright (C) 2008 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 "log.h"
+
+static void register_header_check_fcs(file_stat_t *file_stat);
+static int header_check_fcs(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_fcs= {
+ .extension="fcs",
+ .description="Flow Cytometry Standard 3.0",
+ .min_header_distance=0,
+ .max_filesize=PHOTOREC_MAX_FILE_SIZE,
+ .recover=1,
+ .register_header_check=&register_header_check_fcs
+};
+
+static const unsigned char fcs_signature[6]= {'F','C','S','3','.','0'};
+
+static void register_header_check_fcs(file_stat_t *file_stat)
+{
+ register_header_check(0, fcs_signature, sizeof(fcs_signature), &header_check_fcs, file_stat);
+}
+
+struct fcs_header
+{
+ unsigned char magic[6];
+ unsigned char reserved[4];
+ unsigned char text_start[8]; /* 10 */
+ unsigned char text_end[8]; /* 18 */
+ unsigned char data_start[8]; /* 26 */
+ unsigned char data_end[8]; /* 34 */
+ unsigned char analysis_start[8]; /* 34 */
+ unsigned char analysis_end[8]; /* 50 */
+} __attribute__ ((__packed__));
+
+static uint64_t ascii2int(const unsigned char *string, const unsigned int max_length)
+{
+ uint64_t res=0;
+ unsigned int i;
+ for(i=0;i<max_length;i++)
+ {
+ if(string[i]>='0' && string[i]<='9')
+ res=res*10+(string[i]-'0');
+ else if(!(string[i]==' ' && res==0))
+ return 0;
+ }
+ return res;
+}
+
+static uint64_t ascii2int2(const unsigned char *string, const unsigned int max_length, const unsigned int delimiter)
+{
+ uint64_t res=0;
+ unsigned int i;
+ for(i=0;i<max_length;i++)
+ if(string[i]>='0' && string[i]<='9')
+ res=res*10+(string[i]-'0');
+ else if(string[i]==delimiter)
+ return res;
+ else if(string[i]==' ' && res>0)
+ return res;
+ else if(string[i]!=' ')
+ return 0;
+ return res;
+}
+
+static int header_check_fcs(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, fcs_signature, sizeof(fcs_signature))==0)
+ {
+ const struct fcs_header *fcs=(const struct fcs_header*)buffer;
+ uint64_t text_start;
+ uint64_t text_end;
+ uint64_t data_start;
+ uint64_t data_end;
+ uint64_t analysis_start;
+ uint64_t analysis_end;
+ uint64_t stext_end=0;
+ text_start=ascii2int(fcs->text_start, 8);
+ text_end=ascii2int(fcs->text_end, 8);
+ data_start=ascii2int(fcs->data_start, 8);
+ data_end=ascii2int(fcs->data_end, 8);
+ analysis_start=ascii2int(fcs->analysis_start, 8);
+ analysis_end=ascii2int(fcs->analysis_end, 8);
+ if(!(text_start<=text_end && data_start<=data_end && analysis_start<=analysis_end))
+ return 0;
+ if(data_end==0 || analysis_end==0)
+ { /* Explore TEXT segment */
+ unsigned int i;
+ const char delimiter=buffer[text_start];
+ for(i=0;i<text_end && i<buffer_size;i++)
+ {
+ if(buffer[i]==delimiter)
+ {
+ if(i+1+8+1<text_end &&
+ memcmp(buffer+i+1,"$ENDDATA",8)==0 && buffer[i+1+8]==delimiter)
+ data_end=ascii2int2(&buffer[i+1+8+1], text_end-(i+1+8+1), delimiter);
+ else if(i+1+9+1<text_end &&
+ memcmp(buffer+i+1,"$ENDSTEXT",9)==0 && buffer[i+1+9]==delimiter)
+ stext_end=ascii2int2(&buffer[i+1+9+1], text_end-(i+1+9+1), delimiter);
+ else if(i+1+12+1<text_end &&
+ memcmp(buffer+i+1,"$ENDANALYSIS",12)==0 && buffer[i+1+12]==delimiter)
+ analysis_end=ascii2int2(&buffer[i+1+12+1], text_end-(i+1+12+1), delimiter);
+ }
+ }
+ }
+#ifdef DEBUG_FCS
+ log_info("$ENDDATA %llu\n", (long long unsigned) data_end);
+ log_info("$ENDSTEXT %llu\n", (long long unsigned) stext_end);
+ log_info("$ENDANALYSIS %llu\n", (long long unsigned) analysis_end);
+#endif
+ reset_file_recovery(file_recovery_new);
+ file_recovery_new->extension=file_hint_fcs.extension;
+ file_recovery_new->min_filesize=58;
+ file_recovery_new->calculated_file_size=data_end+9;
+ if(file_recovery_new->calculated_file_size < analysis_end+9)
+ file_recovery_new->calculated_file_size=analysis_end+9;
+ if(file_recovery_new->calculated_file_size < stext_end+9)
+ file_recovery_new->calculated_file_size=stext_end+9;
+ file_recovery_new->data_check=&data_check_size;
+ file_recovery_new->file_check=&file_check_size;
+ return 1;
+ }
+ return 0;
+}