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src/file_njx.c: add frama-c annotations

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This commit is contained in:
Christophe Grenier 2021-02-25 17:24:56 +01:00
parent fd9ae3893a
commit 214a1dfc1b
1 changed files with 28 additions and 10 deletions
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38
src/file_njx.c
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@ -31,10 +31,8 @@
#include "types.h" #include "types.h"
#include "filegen.h" #include "filegen.h"
/*@ requires \valid(file_stat); */
static void register_header_check_njx(file_stat_t *file_stat); static void register_header_check_njx(file_stat_t *file_stat);
static int header_check_njx(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);
static void file_check_njx(file_recovery_t *file_recovery);
const file_hint_t file_hint_njx= { const file_hint_t file_hint_njx= {
.extension="njx", .extension="njx",
@ -45,13 +43,33 @@ const file_hint_t file_hint_njx= {
.register_header_check=&register_header_check_njx .register_header_check=&register_header_check_njx
}; };
static const unsigned char njx_header[4]= {0x04, 'N', 'j', 0x0f}; /*@
@ requires \valid(file_recovery);
static void register_header_check_njx(file_stat_t *file_stat) @ requires valid_file_recovery(file_recovery);
@ requires \valid(file_recovery->handle);
@ requires \separated(file_recovery, file_recovery->handle, file_recovery->extension, &errno, &Frama_C_entropy_source);
@ requires file_recovery->file_check == &file_check_njx;
@ ensures \valid(file_recovery->handle);
@ assigns *file_recovery->handle, errno, file_recovery->file_size;
@ assigns Frama_C_entropy_source;
@*/
static void file_check_njx(file_recovery_t *file_recovery)
{ {
register_header_check(0, njx_header,sizeof(njx_header), &header_check_njx, file_stat); const unsigned char njx_footer[4]= {'N', 'J', '*', 0x04};
file_search_footer(file_recovery, njx_footer, sizeof(njx_footer), 0);
} }
/*@
@ requires buffer_size >= 12;
@ 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_njx, 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_njx(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) static int header_check_njx(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(buffer[0]==0x04 && buffer[1]=='N' && buffer[2]=='j' && buffer[3]==0x0f && if(buffer[0]==0x04 && buffer[1]=='N' && buffer[2]=='j' && buffer[3]==0x0f &&
@ -65,9 +83,9 @@ static int header_check_njx(const unsigned char *buffer, const unsigned int buff
return 0; return 0;
} }
static void file_check_njx(file_recovery_t *file_recovery) static void register_header_check_njx(file_stat_t *file_stat)
{ {
const unsigned char njx_footer[4]= {'N', 'J', '*', 0x04}; static const unsigned char njx_header[4]= {0x04, 'N', 'j', 0x0f};
file_search_footer(file_recovery, njx_footer, sizeof(njx_footer), 0); register_header_check(0, njx_header,sizeof(njx_header), &header_check_njx, file_stat);
} }
#endif #endif