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src/file_dv.c: fix frama-c annotations for data_check_*()

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This commit is contained in:
Christophe Grenier 2021-01-29 19:09:18 +01:00
parent d585a2d924
commit 5d914f2a45
1 changed files with 54 additions and 2 deletions
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56
src/file_dv.c
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@ -34,6 +34,7 @@
#include "__fc_builtin.h"
#endif
/*@ requires \valid(file_stat); */
static void register_header_check_dv(file_stat_t *file_stat);
const file_hint_t file_hint_dv= {
@ -45,6 +46,17 @@ const file_hint_t file_hint_dv= {
.register_header_check=&register_header_check_dv
};
/*@
@ requires buffer_size > 0;
@ requires (buffer_size&1)==0;
@ requires \valid_read(buffer+(0..buffer_size-1));
@ requires \valid(file_recovery);
@ requires file_recovery->data_check==&data_check_NTSC;
@ requires file_recovery->calculated_file_size <= PHOTOREC_MAX_FILE_SIZE;
@ requires \separated(buffer, file_recovery);
@ ensures \result == DC_CONTINUE || \result == DC_STOP;
@ assigns file_recovery->calculated_file_size;
@*/
static data_check_t data_check_NTSC(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
/*@
@ -53,7 +65,8 @@ static data_check_t data_check_NTSC(const unsigned char *buffer, const unsigned
while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
file_recovery->calculated_file_size + 8 < file_recovery->file_size + buffer_size/2)
{
const unsigned int i=file_recovery->calculated_file_size - file_recovery->file_size + buffer_size/2;
const unsigned int i=file_recovery->calculated_file_size + buffer_size/2 - file_recovery->file_size;
/*@ assert 0 <= i < buffer_size - 8; */
if(buffer[i]==0x1f && buffer[i+1]==0x07 && buffer[i+2]==0x00 &&
buffer[i+5]==0x78 && buffer[i+6]==0x78 && buffer[i+7]==0x78)
file_recovery->calculated_file_size+=120000;
@ -63,6 +76,13 @@ static data_check_t data_check_NTSC(const unsigned char *buffer, const unsigned
return DC_CONTINUE;
}
/*@
@ requires \valid(fr);
@ requires fr->file_check == &file_check_dv_NTSC;
@ requires valid_file_recovery(fr);
@ ensures valid_file_recovery(fr);
@ assigns *fr->handle, errno, Frama_C_entropy_source, fr->file_size;
@*/
static void file_check_dv_NTSC(file_recovery_t *fr)
{
unsigned char buffer_header[512];
@ -78,6 +98,7 @@ static void file_check_dv_NTSC(file_recovery_t *fr)
fs-=120000;
if(fs > 0)
fs-=120000;
/*@ loop assigns fs, *fr->handle, errno, Frama_C_entropy_source, fr->file_size; */
while(fs < fr->file_size &&
my_fseek(fr->handle, fs, SEEK_SET) >= 0 &&
fread(&buffer, sizeof(buffer), 1, fr->handle) == 1)
@ -86,6 +107,7 @@ static void file_check_dv_NTSC(file_recovery_t *fr)
#if defined(__FRAMAC__)
Frama_C_make_unknown((char *)&buffer, sizeof(buffer));
#endif
/*@ loop assigns i, fr->file_size; */
for(i=1; i<sizeof(buffer); i+=0x50)
if((buffer[i]&0x0f)!=(buffer_header[1]&0x0f))
{
@ -97,6 +119,17 @@ static void file_check_dv_NTSC(file_recovery_t *fr)
fr->file_size=fs;
}
/*@
@ requires buffer_size > 0;
@ requires (buffer_size&1)==0;
@ requires \valid_read(buffer+(0..buffer_size-1));
@ requires \valid(file_recovery);
@ requires file_recovery->data_check==&data_check_PAL;
@ requires file_recovery->calculated_file_size <= PHOTOREC_MAX_FILE_SIZE;
@ requires \separated(buffer, file_recovery);
@ ensures \result == DC_CONTINUE || \result == DC_STOP;
@ assigns file_recovery->calculated_file_size;
@*/
static data_check_t data_check_PAL(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
/*@
@ -105,7 +138,8 @@ static data_check_t data_check_PAL(const unsigned char *buffer, const unsigned i
while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
file_recovery->calculated_file_size + 8 < file_recovery->file_size + buffer_size/2)
{
const unsigned int i=file_recovery->calculated_file_size - file_recovery->file_size + buffer_size/2;
const unsigned int i=file_recovery->calculated_file_size + buffer_size/2 - file_recovery->file_size;
/*@ assert 0 <= i < buffer_size - 8; */
if(buffer[i]==0x1f && buffer[i+1]==0x07 && buffer[i+2]==0x00 &&
buffer[i+5]==0x78 && buffer[i+6]==0x78 && buffer[i+7]==0x78)
file_recovery->calculated_file_size+=144000;
@ -115,6 +149,13 @@ static data_check_t data_check_PAL(const unsigned char *buffer, const unsigned i
return DC_CONTINUE;
}
/*@
@ requires \valid(fr);
@ requires fr->file_check == &file_check_dv_PAL;
@ requires valid_file_recovery(fr);
@ ensures valid_file_recovery(fr);
@ assigns *fr->handle, errno, Frama_C_entropy_source, fr->file_size;
@*/
static void file_check_dv_PAL(file_recovery_t *fr)
{
unsigned char buffer_header[512];
@ -130,6 +171,7 @@ static void file_check_dv_PAL(file_recovery_t *fr)
fs-=144000;
if(fs > 0)
fs-=144000;
/*@ loop assigns fs, *fr->handle, errno, Frama_C_entropy_source, fr->file_size; */
while(fs < fr->file_size &&
my_fseek(fr->handle, fs, SEEK_SET) >= 0 &&
fread(&buffer, sizeof(buffer), 1, fr->handle) == 1)
@ -138,6 +180,7 @@ static void file_check_dv_PAL(file_recovery_t *fr)
#if defined(__FRAMAC__)
Frama_C_make_unknown((char *)&buffer, sizeof(buffer));
#endif
/*@ loop assigns i, fr->file_size; */
for(i=1; i<sizeof(buffer); i+=0x50)
if((buffer[i]&0x0f)!=(buffer_header[1]&0x0f))
{
@ -150,6 +193,15 @@ static void file_check_dv_PAL(file_recovery_t *fr)
}
/*@
@ requires buffer_size >= 8;
@ 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_dv, buffer+(..), file_recovery, file_recovery_new);
@ ensures \result!=0 ==> valid_file_recovery(file_recovery_new);
@*/
static int header_check_dv(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]!=0x1f || buffer[1]!=0x07 || buffer[2]!=0x00 || buffer[5]!=0x78 || buffer[6]!=0x78 || buffer[7]!=0x78)