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src/file_pct.c: add frama-c annotations

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This commit is contained in:
Christophe Grenier 2021-02-27 10:27:22 +01:00
parent 885ea37edc
commit 4feb83946b
1 changed files with 36 additions and 14 deletions
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50
src/file_pct.c
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@ -32,10 +32,12 @@
#include "common.h"
#include "log.h"
#if !defined(SINGLE_FORMAT)
extern const file_hint_t file_hint_indd;
#endif
/*@ requires \valid(file_stat); */
static void register_header_check_pct(file_stat_t *file_stat);
static int header_check_pct(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_pct(file_recovery_t *file_recovery);
const file_hint_t file_hint_pct= {
.extension="pct",
@ -80,6 +82,34 @@ struct pct_file_entry {
uint32_t Reserved2; /* 0x24 */
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires \valid(file_recovery);
@ requires valid_file_recovery(file_recovery);
@ requires file_recovery->file_check == &file_check_pct;
@ ensures valid_file_recovery(file_recovery);
@ assigns file_recovery->file_size;
@*/
static void file_check_pct(file_recovery_t *file_recovery)
{
if(file_recovery->file_size<0x210 ||
file_recovery->file_size<file_recovery->min_filesize)
{
file_recovery->file_size=0;
return ;
}
file_recovery->file_size-=((file_recovery->file_size-file_recovery->min_filesize)&0xFFFF);
}
/*@
@ requires buffer_size >= 0x200+sizeof(struct pct_file_entry);
@ 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_pct, buffer+(..), file_recovery, file_recovery_new);
@ ensures \result == 0 || \result == 1;
@ ensures \result!=0 ==> valid_file_recovery(file_recovery_new);
@*/
static int header_check_pct(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 pct_file_entry *pct=(const struct pct_file_entry *)(&buffer[0x200]);
@ -95,16 +125,19 @@ static int header_check_pct(const unsigned char *buffer, const unsigned int buff
be16(pct->VersionOperator)==0x0011 &&
be16(pct->VersionNumber)==0x02ff)
{
const unsigned int min_filesize=(buffer[0x200]<<8)+buffer[0x201];
#if !defined(SINGLE_FORMAT)
if(file_recovery->file_stat != NULL &&
file_recovery->file_stat->file_hint==&file_hint_indd)
{
if(header_ignored_adv(file_recovery, file_recovery_new)==0)
return 0;
}
#endif
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_pct.extension;
/* We only have the low 16bits of the filesystem */
file_recovery_new->min_filesize=(buffer[0x200]<<8)+buffer[0x201];
file_recovery_new->min_filesize=(min_filesize > 0x200+sizeof(struct pct_file_entry) ? min_filesize : 0x200+sizeof(struct pct_file_entry));
file_recovery_new->file_check=&file_check_pct;
#ifdef DEBUG_PCT
log_info("X %u-%u, Y %u-%u\n",
@ -119,17 +152,6 @@ static int header_check_pct(const unsigned char *buffer, const unsigned int buff
return 0;
}
static void file_check_pct(file_recovery_t *file_recovery)
{
if(file_recovery->file_size<0x210 ||
file_recovery->file_size<file_recovery->min_filesize)
{
file_recovery->file_size=0;
return ;
}
file_recovery->file_size-=((file_recovery->file_size-file_recovery->min_filesize)&0xFFFF);
}
static void register_header_check_pct(file_stat_t *file_stat)
{
static const unsigned char pct_header[6]= { 0x00, 0x11, 0x02, 0xff, 0x0c, 0x00};