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PhotoRec: detect .iso filesize

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This commit is contained in:
Christophe Grenier 2008-04-02 23:58:10 +02:00
parent 26cd126d3f
commit 1739339385
1 changed files with 51 additions and 13 deletions
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64
src/file_iso.c
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@ -30,13 +30,12 @@
#include "types.h"
#include "filegen.h"
static void register_header_check_iso(file_stat_t *file_stat);
static int header_check_db(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 file_hint_t file_hint_iso= {
.extension="iso",
.description="ISO (Only detected if block size >= 64k)",
.description="ISO",
.min_header_distance=0,
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
@ -44,30 +43,69 @@ const file_hint_t file_hint_iso= {
.register_header_check=&register_header_check_iso
};
static const unsigned char iso_header[6]= { 0x01, 'C', 'D', '0', '0', '1'};
/* ISO 9660
0x00 Volume Descriptor Type 0x01
0x01 Standard Identifier CD001
0x07 Volume Descriptor Version 0x01
0x08 Unused Field 0x00
0x09 System Identifier
0x41 Volume Identifier
0x73 Unused Field
*/
static void register_header_check_iso(file_stat_t *file_stat)
{
register_header_check(0x8000, iso_header,sizeof(iso_header), &header_check_db, file_stat);
}
struct iso_primary_descriptor
{
char type;
char id[5];
char version;
char unused1;
char system_id[32];
char volume_id[32];
char unused2[8];
char volume_space_size[8];
char unused3[32];
char volume_set_size[4];
char volume_sequence_number[4];
char logical_block_size[4];
char path_table_size[8];
char type_l_path_tabl[4];
char opt_type_l_path_table[4];
char type_m_path_table[4];
char opt_type_m_path_table[4];
char root_directory_record[34];
char volume_set_id[128];
char publisher_id[128];
char preparer_id[128];
char application_id[128];
char copyright_file_id[37];
char abstract_file_id[37];
char bibliographic_file_id[37];
char creation_date[17];
char modification_date[17];
char expiration_date[17];
char effective_date[17];
char file_structure_version;
char unused4;
char application_data[512];
char unused5[653];
} __attribute__ ((__packed__));
static int header_check_db(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)
{
if(buffer_size<0x8000+sizeof(iso_header))
if(buffer_size<0x8000+512) /* +2048 for the full mapping */
return 0;
if(memcmp (&buffer[0x8000], iso_header, sizeof(iso_header))==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);
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_iso.extension;
if(volume_space_size==volume_space_size2 && logical_block_size==logical_block_size2)
{ /* ISO 9660 */
file_recovery_new->calculated_file_size=(uint64_t)volume_space_size * logical_block_size;
file_recovery_new->data_check=&data_check_size;
file_recovery_new->file_check=&file_check_size;
}
return 1;
}
return 0;