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src/file_mid.c: fix frama-c warnings

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Christophe Grenier 2021-02-06 22:22:41 +01:00
parent 162d0ca174
commit 1fc44cfaf8
1 changed files with 42 additions and 1 deletions
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43
src/file_mid.c
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@ -33,6 +33,7 @@
#include "common.h"
#include "log.h"
/*@ requires \valid(file_stat); */
static void register_header_check_mid(file_stat_t *file_stat);
const file_hint_t file_hint_mid= {
@ -55,6 +56,18 @@ struct midi_header
int16_t time_division;
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires valid_file_recovery(file_recovery);
@ requires \valid(file_recovery->handle);
@ requires file_recovery->file_check == &file_check_midi;
@ requires separation: \separated(file_recovery, file_recovery->handle, &errno, &Frama_C_entropy_source);
@ assigns errno;
@ assigns file_recovery->calculated_file_size;
@ assigns file_recovery->file_size;
@ assigns *file_recovery->handle;
@ assigns file_recovery->time;
@ assigns Frama_C_entropy_source;
@*/
static void file_check_midi(file_recovery_t *file_recovery)
{
const uint64_t fs_org=file_recovery->file_size;
@ -67,6 +80,10 @@ static void file_check_midi(file_recovery_t *file_recovery)
fread(&hdr, sizeof(hdr), 1, file_recovery->handle) != 1)
return ;
tracks=be16(hdr.tracks);
/*@
@ loop assigns i, *file_recovery->handle, fs;
@ loop assigns errno, Frama_C_entropy_source;
@*/
for(i=0; i<tracks; i++)
{
struct midi_header track;
@ -84,12 +101,25 @@ static void file_check_midi(file_recovery_t *file_recovery)
file_recovery->file_size=fs;
}
/*@
@ requires buffer_size >= 2 && (buffer_size&1)==0;
@ requires \valid(file_recovery);
@ requires \valid_read(buffer + ( 0 .. buffer_size-1));
@ requires file_recovery->data_check == &data_check_midi;
@ requires separation: \separated(buffer+(..), file_recovery);
@ ensures \result == DC_CONTINUE || \result == DC_STOP;
@ assigns file_recovery->calculated_file_size;
@*/
static data_check_t data_check_midi(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
/*@
@ loop assigns file_recovery->calculated_file_size;
@*/
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; */
const struct midi_header *hdr=(const struct midi_header*)&buffer[i];
const uint64_t len=be32(hdr->len);
#ifdef DEBUG_MIDI
@ -102,6 +132,17 @@ static data_check_t data_check_midi(const unsigned char *buffer, const unsigned
return DC_CONTINUE;
}
/*@
@ requires buffer_size >= sizeof(struct midi_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_mid, buffer+(..), file_recovery, file_recovery_new);
@ assigns *file_recovery_new;
@ ensures \result == 0 || \result == 1;
@ ensures \result!=0 ==> valid_file_recovery(file_recovery_new);
@*/
static int header_check_mid(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 midi_header *hdr=(const struct midi_header *)buffer;