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src/file_vmg.c: add Frama-C annotations

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This commit is contained in:
Christophe Grenier 2021-03-13 16:37:53 +01:00
parent f2fbce4c37
commit c8100ec06f
1 changed files with 39 additions and 19 deletions
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58
src/file_vmg.c
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@ -31,43 +31,63 @@
#include "types.h" #include "types.h"
#include "filegen.h" #include "filegen.h"
/*@ requires \valid(file_stat); */
static void register_header_check_vmg(file_stat_t *file_stat); static void register_header_check_vmg(file_stat_t *file_stat);
const file_hint_t file_hint_vmg= { const file_hint_t file_hint_vmg = {
.extension="vmg", .extension = "vmg",
.description="Nokia Text Message", .description = "Nokia Text Message",
.max_filesize=PHOTOREC_MAX_FILE_SIZE, .max_filesize = PHOTOREC_MAX_FILE_SIZE,
.recover=1, .recover = 1,
.enable_by_default=1, .enable_by_default = 1,
.register_header_check=&register_header_check_vmg .register_header_check = &register_header_check_vmg
}; };
/*@
@ requires \valid(file_recovery);
@ requires valid_file_recovery(file_recovery);
@ requires \separated(file_recovery, file_recovery->handle, file_recovery->extension, &errno, &Frama_C_entropy_source);
@ requires file_recovery->file_check == &file_check_vmg;
@ ensures \valid(file_recovery->handle);
@ assigns *file_recovery->handle, errno, file_recovery->file_size;
@ assigns Frama_C_entropy_source;
@*/
static void file_check_vmg(file_recovery_t *file_recovery) static void file_check_vmg(file_recovery_t *file_recovery)
{ {
const unsigned char vmg_footer[0x15]= { const unsigned char vmg_footer[0x15] = {
0x00, '\n', 0x00, 'E' , 0x00, 'N' , 0x00, 'D' , 0x00, '\n', 0x00, 'E', 0x00, 'N', 0x00, 'D',
0x00, ':' , 0x00, 'V' , 0x00, 'M' , 0x00, 'S' , 0x00, ':', 0x00, 'V', 0x00, 'M', 0x00, 'S',
0x00, 'G' , 0x00, '\n', 0x00 0x00, 'G', 0x00, '\n', 0x00
}; };
file_search_footer(file_recovery, vmg_footer, sizeof(vmg_footer), 0); file_search_footer(file_recovery, vmg_footer, sizeof(vmg_footer), 0);
} }
/*@
@ requires buffer_size >= 0 ;
@ 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_vmg, buffer+(..), file_recovery, file_recovery_new);
@ ensures \result!=0 ==> valid_file_recovery(file_recovery_new);
@ assigns *file_recovery_new;
@*/
static int header_check_vmg(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_vmg(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)
{ {
reset_file_recovery(file_recovery_new); reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_vmg.extension; file_recovery_new->extension = file_hint_vmg.extension;
file_recovery_new->file_check=&file_check_vmg; file_recovery_new->file_check = &file_check_vmg;
return 1; return 1;
} }
static void register_header_check_vmg(file_stat_t *file_stat) static void register_header_check_vmg(file_stat_t *file_stat)
{ {
static const unsigned char vmg_header[0x28]= { static const unsigned char vmg_header[0x28] = {
'B' , 0x00, 'E' , 0x00, 'G' , 0x00, 'I' , 0x00, 'B', 0x00, 'E', 0x00, 'G', 0x00, 'I', 0x00,
'N' , 0x00, ':' , 0x00, 'V' , 0x00, 'M' , 0x00, 'N', 0x00, ':', 0x00, 'V', 0x00, 'M', 0x00,
'S' , 0x00, 'G' , 0x00, '\n', 0x00, 'V' , 0x00, 'S', 0x00, 'G', 0x00, '\n', 0x00, 'V', 0x00,
'E' , 0x00, 'R' , 0x00, 'S' , 0x00, 'I' , 0x00, 'E', 0x00, 'R', 0x00, 'S', 0x00, 'I', 0x00,
'O' , 0x00, 'N' , 0x00, ':' , 0x00, '1' , 0x00 'O', 0x00, 'N', 0x00, ':', 0x00, '1', 0x00
}; };
register_header_check(0, vmg_header, sizeof(vmg_header), &header_check_vmg, file_stat); register_header_check(0, vmg_header, sizeof(vmg_header), &header_check_vmg, file_stat);
} }