src/file_fm.c: add frama-c annotations

1 files changed, 15 insertions, 2 deletions

diff --git a/src/file_fm.c b/src/file_fm.c
index d5800c2e..efa28f42 100644
--- a/src/file_fm.c
+++ b/src/file_fm.c
@@ -32,6 +32,7 @@
 #include "filegen.h"
 #include "common.h"
 
+/*@ requires \valid(file_stat); */
 static void register_header_check_fm(file_stat_t *file_stat);
 
 const file_hint_t file_hint_fm= {
@@ -49,14 +50,26 @@ struct fm_header
   uint64_t size;
 } __attribute__ ((gcc_struct, __packed__));
 
+/*@
+  @ requires buffer_size >= sizeof(struct fm_header);
+  @ requires \valid_read(buffer+(0..buffer_size-1));
+  @ requires valid_file_recovery(file_recovery);
+  @ requires \valid(file_recovery_new);
+  @ requires file_recovery_new->blocksize > 0;
+  @ requires separation: \separated(&file_hint_fm, buffer+(..), file_recovery, file_recovery_new);
+  @ ensures \result == 0 || \result == 1;
+  @ ensures  \result!=0 ==> valid_file_recovery(file_recovery_new);
+  @ assigns  *file_recovery_new;
+  @*/
 static int header_check_fm(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 fm_header *hdr=(const struct fm_header *)buffer;
-  if(le64(hdr->size) > PHOTOREC_MAX_FILE_SIZE)
+  const uint64_t size=le64(hdr->size);
+  if(size > PHOTOREC_MAX_FILE_SIZE)
     return 0;
   reset_file_recovery(file_recovery_new);
   file_recovery_new->extension=file_hint_fm.extension;
-  file_recovery_new->calculated_file_size=(uint64_t)le64(hdr->size) + 12833;
+  file_recovery_new->calculated_file_size=size + 12833;
   file_recovery_new->data_check=&data_check_size;
   file_recovery_new->file_check=&file_check_size;
   return 1;