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src/file_gz.[ch]: improve frama-c annotations

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This commit is contained in:
Christophe Grenier 2021-02-11 19:24:00 +01:00
parent 61fedc65de
commit 4fecbf045c
2 changed files with 39 additions and 7 deletions
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43
src/file_gz.c
View file

@ -20,7 +20,6 @@
*/
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_gz)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
@ -35,13 +34,16 @@
#endif
#include <stdio.h>
#include "types.h"
#include "file_gz.h"
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_gz)
#ifdef HAVE_ZLIB_H
#include <zlib.h>
#endif
#include "filegen.h"
#include "common.h"
#include "file_gz.h"
/*@ requires \valid(file_stat); */
static void register_header_check_gz(file_stat_t *file_stat);
static void file_rename_gz(file_recovery_t *file_recovery);
#ifndef SINGLE_FORMAT
@ -83,10 +85,22 @@ struct gzip_header
#define GZ_FNAME 8
#define GZ_FCOMMENT 0x10
#if defined(HAVE_ZLIB_H) && defined(HAVE_LIBZ)
/*@ assigns \nothing; */
static void file_check_bgzf(file_recovery_t *file_recovery)
{
}
/*@
@ requires buffer_size >= sizeof(struct gzip_header);
@ requires \valid_read(buffer+(0..buffer_size-1));
@ requires \valid_read(buffer_uncompr + (0 .. 4-1));
@ requires \valid(file_recovery_new);
@ requires separation: \separated(buffer+(..), file_recovery_new);
@ assigns *file_recovery_new;
@ ensures \result == 1;
@ ensures valid_file_recovery(file_recovery_new);
@*/
static int header_check_bgzf(const unsigned char *buffer, const unsigned char *buffer_uncompr, const unsigned int buffer_size, file_recovery_t *file_recovery_new)
{
const struct gzip_header *gz=(const struct gzip_header *)buffer;
@ -99,24 +113,39 @@ static int header_check_bgzf(const unsigned char *buffer, const unsigned char *b
{
/* https://github.com/samtools/hts-specs SAM/BAM and related high-throughput sequencing file formats */
file_recovery_new->extension="bai";
/*@ assert valid_file_recovery(file_recovery_new); */
return 1;
}
if(memcmp(buffer_uncompr, "BAM\1", 4)==0)
{
/* https://github.com/samtools/hts-specs SAM/BAM and related high-throughput sequencing file formats */
file_recovery_new->extension="bam";
/*@ assert valid_file_recovery(file_recovery_new); */
return 1;
}
if(memcmp(buffer_uncompr, "CSI\1", 4)==0)
{
/* https://github.com/samtools/hts-specs SAM/BAM and related high-throughput sequencing file formats */
file_recovery_new->extension="csi";
/*@ assert valid_file_recovery(file_recovery_new); */
return 1;
}
file_recovery_new->extension="bgz";
/*@ assert valid_file_recovery(file_recovery_new); */
return 1;
}
#endif
/*@
@ requires buffer_size >= 16;
@ 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_gz, buffer+(..), file_recovery, file_recovery_new);
@ ensures \result == 0 || \result == 1;
@ ensures \result!=0 ==> valid_file_recovery(file_recovery_new);
@*/
static int header_check_gz(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)
{
unsigned int off=10;
@ -330,11 +359,6 @@ static int header_check_gz(const unsigned char *buffer, const unsigned int buffe
return 0;
}
#endif
if(file_recovery->file_check==&file_check_bgzf)
{
header_ignored(file_recovery_new);
return 0;
}
reset_file_recovery(file_recovery_new);
file_recovery_new->min_filesize=22;
file_recovery_new->time=le32(gz->mtime);
@ -344,6 +368,11 @@ static int header_check_gz(const unsigned char *buffer, const unsigned int buffe
return 1;
}
/*@
@ requires \valid(file_recovery);
@ requires valid_file_recovery(file_recovery);
@ requires file_recovery->file_rename==&file_rename_gz;
@*/
static void file_rename_gz(file_recovery_t *file_recovery)
{
unsigned char buffer[512];

3
src/file_gz.h
View file

@ -25,6 +25,9 @@
extern "C" {
#endif
/*@
@ assigns \result;
@*/
const char*td_zlib_version(void);
#ifdef __cplusplus