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PhotoRec: rewrote the size tests to be more readable

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This commit is contained in:
Christophe Grenier 2020-09-14 18:38:12 +02:00
parent f236b8cc4d
commit cec850223e
3 changed files with 23 additions and 21 deletions
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14
src/file_iso.c
View file

@ -29,6 +29,7 @@
#endif
#include <stdio.h>
#include "types.h"
#include "common.h"
#include "filegen.h"
#include "iso9660.h"
@ -50,13 +51,13 @@ static int header_check_db(const unsigned char *buffer, const unsigned int buffe
return 0;
{
const struct iso_primary_descriptor *iso1=(const struct iso_primary_descriptor*)&buffer[0x8000];
const unsigned int volume_space_size=iso1->volume_space_size[0] | (iso1->volume_space_size[1]<<8) | (iso1->volume_space_size[2]<<16) | (iso1->volume_space_size[3]<<24);
const unsigned int volume_space_size2=iso1->volume_space_size[7] | (iso1->volume_space_size[6]<<8) | (iso1->volume_space_size[5]<<16) | (iso1->volume_space_size[4]<<24);
const unsigned int logical_block_size=iso1->logical_block_size[0] | (iso1->logical_block_size[1]<<8);
const unsigned int logical_block_size2=iso1->logical_block_size[3] | (iso1->logical_block_size[2]<<8);
if(volume_space_size==volume_space_size2 && logical_block_size==logical_block_size2)
const unsigned int volume_space_size_le=le32(iso1->volume_space_size_le);
const unsigned int volume_space_size_be=be32(iso1->volume_space_size_be);
const unsigned int logical_block_size_le=le16(iso1->logical_block_size_le);
const unsigned int logical_block_size_be=be16(iso1->logical_block_size_be);
if(volume_space_size_le==volume_space_size_be && logical_block_size_le==logical_block_size_be)
{ /* ISO 9660 */
const uint64_t size=(uint64_t)volume_space_size * logical_block_size;
const uint64_t size=(uint64_t)volume_space_size_le * logical_block_size_le;
if(size < 0x8000+512)
return 0;
reset_file_recovery(file_recovery_new);
@ -79,5 +80,4 @@ static void register_header_check_iso(file_stat_t *file_stat)
static const unsigned char iso_header[6]= { 0x01, 'C', 'D', '0', '0', '1'};
register_header_check(0x8000, iso_header,sizeof(iso_header), &header_check_db, file_stat);
}
#endif

24
src/iso.c
View file

@ -67,15 +67,15 @@ int check_ISO(disk_t *disk_car, partition_t *partition)
static void set_ISO_info(const struct iso_primary_descriptor *iso, partition_t *partition)
{
const unsigned int volume_space_size=iso->volume_space_size[0] | (iso->volume_space_size[1]<<8) | (iso->volume_space_size[2]<<16) | (iso->volume_space_size[3]<<24);
const unsigned int volume_space_size2=iso->volume_space_size[7] | (iso->volume_space_size[6]<<8) | (iso->volume_space_size[5]<<16) | (iso->volume_space_size[4]<<24);
const unsigned int logical_block_size=iso->logical_block_size[0] | (iso->logical_block_size[1]<<8);
const unsigned int logical_block_size2=iso->logical_block_size[3] | (iso->logical_block_size[2]<<8);
const unsigned int volume_space_size_le=le32(iso->volume_space_size_le);
const unsigned int volume_space_size_be=be32(iso->volume_space_size_be);
const unsigned int logical_block_size_le=le16(iso->logical_block_size_le);
const unsigned int logical_block_size_be=be16(iso->logical_block_size_be);
partition->upart_type=UP_ISO;
set_part_name_chomp(partition, (const unsigned char*)iso->volume_id, 32);
if(volume_space_size==volume_space_size2 && logical_block_size==logical_block_size2)
if(volume_space_size_le==volume_space_size_be && logical_block_size_le==logical_block_size_be)
{
partition->blocksize=logical_block_size;
partition->blocksize=logical_block_size_le;
snprintf(partition->info, sizeof(partition->info),
"ISO9660 blocksize=%u", partition->blocksize);
}
@ -89,13 +89,13 @@ int recover_ISO(const struct iso_primary_descriptor *iso, partition_t *partition
return 1;
set_ISO_info(iso, partition);
{
const unsigned int volume_space_size=iso->volume_space_size[0] | (iso->volume_space_size[1]<<8) | (iso->volume_space_size[2]<<16) | (iso->volume_space_size[3]<<24);
const unsigned int volume_space_size2=iso->volume_space_size[7] | (iso->volume_space_size[6]<<8) | (iso->volume_space_size[5]<<16) | (iso->volume_space_size[4]<<24);
const unsigned int logical_block_size=iso->logical_block_size[0] | (iso->logical_block_size[1]<<8);
const unsigned int logical_block_size2=iso->logical_block_size[3] | (iso->logical_block_size[2]<<8);
if(volume_space_size==volume_space_size2 && logical_block_size==logical_block_size2)
const unsigned int volume_space_size_le=le32(iso->volume_space_size_le);
const unsigned int volume_space_size_be=be32(iso->volume_space_size_be);
const unsigned int logical_block_size_le=le16(iso->logical_block_size_le);
const unsigned int logical_block_size_be=be16(iso->logical_block_size_be);
if(volume_space_size_le==volume_space_size_be && logical_block_size_le==logical_block_size_be)
{ /* ISO 9660 */
partition->part_size=(uint64_t)volume_space_size * logical_block_size;
partition->part_size=(uint64_t)volume_space_size_le * logical_block_size_le;
}
}
return 0;

6
src/iso9660.h
View file

@ -33,11 +33,13 @@ struct iso_primary_descriptor
char system_id[32];
char volume_id[32];
char unused2[8];
char volume_space_size[8];
uint32_t volume_space_size_le;
uint32_t volume_space_size_be;
char unused3[32];
char volume_set_size[4];
char volume_sequence_number[4];
char logical_block_size[4];
uint16_t logical_block_size_le;
uint16_t logical_block_size_be;
char path_table_size[8];
char type_l_path_tabl[4];
char opt_type_l_path_table[4];