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src/file_au.c: fix frama-c warnings

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This commit is contained in:
Christophe Grenier 2021-02-13 17:18:31 +01:00
parent 469773f2da
commit 674a3f3600
1 changed files with 19 additions and 4 deletions
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23
src/file_au.c
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@ -32,6 +32,7 @@
#include "common.h"
#include "filegen.h"
/*@ requires \valid(file_stat); */
static void register_header_check_au(file_stat_t *file_stat);
const file_hint_t file_hint_au= {
@ -54,21 +55,35 @@ struct header_au_s
uint32_t channels;
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires buffer_size > sizeof(struct header_au_s);
@ 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_au, 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_au(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 header_au_s *au=(const struct header_au_s *)buffer;
if((const uint32_t)be32(au->offset) >= sizeof(struct header_au_s) &&
const unsigned int offset=be32(au->offset);
const unsigned int size=be32(au->size);
if(offset >= sizeof(struct header_au_s) &&
be32(au->encoding)>0 && be32(au->encoding)<=27 &&
be32(au->channels)>0 && be32(au->channels)<=256)
{
if(be32(au->size)!=0xffffffff)
if(size!=0xffffffff)
{
if(be32(au->offset)+be32(au->size) < 111)
const uint64_t cfs=(uint64_t)offset + size;
if(cfs < 111)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->min_filesize=111;
file_recovery_new->extension=file_hint_au.extension;
file_recovery_new->calculated_file_size=(uint64_t)be32(au->offset)+be32(au->size);
file_recovery_new->calculated_file_size=cfs;
file_recovery_new->data_check=&data_check_size;
file_recovery_new->file_check=&file_check_size;
return 1;