iso9660.h

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#ifndef __FS__ISO9660_H__
#define __FS__ISO9660_H__
 
#include "vfs/filesystem.h"
#include "vfs/vnode.h"
#include <type.h>
 
typedef struct {
    uint32_t le; // little endian
    uint32_t be; // big endian
} both_u32;
 
typedef struct {
    uint16_t le;
    uint16_t be;
} both_u16;
 
// Struktur Primary Volume Descriptor (PVD)
struct iso9660_pvd {
    uint8_t type;    // harus = 1 untuk PVD
    char id[5];      // "CD001"
    uint8_t version; // harus = 1
    uint8_t unused1;
 
    char system_id[32]; // strA
    char volume_id[32]; // strD
 
    uint8_t unused2[8];
 
    both_u32 volume_space_size; // jumlah logical blocks
 
    uint8_t unused3[32];
 
    both_u16 volume_set_size;
    both_u16 volume_sequence_number;
    both_u16 logical_block_size;
 
    both_u32 path_table_size;
 
    uint32_t l_path_table_loc; // LBA lokasi type-L path table
    uint32_t opt_l_path_table_loc;
    uint32_t m_path_table_loc; // LBA lokasi type-M path table
    uint32_t opt_m_path_table_loc;
 
    // Root directory record
    // Struktur ini sebenarnya “Directory Record” dengan panjang tetap 34
    // byte pada PVD
    uint8_t root_dir_record[34];
 
    char volume_set_id[128];
    char publisher_id[128];
    char data_preparer_id[128];
    char application_id[128];
    char copyright_file_id[37];
    char abstract_file_id[37];
    char bibliographic_file_id[37];
 
    // Tanggal/waktu (dec-datetime), 17 byte tiap field
    char creation_date[17];
    char modification_date[17];
    char expiration_date[17];
    char effective_date[17];
 
    uint8_t file_structure_version;
    uint8_t unused4;
 
    uint8_t application_data[512];
    uint8_t reserved[653];
} __attribute__((packed));
 
// Struktur Path Table Entry
struct iso9660_path_table_entry {
    uint8_t dir_id_len;
    uint8_t ext_attr_rec_len;
    uint32_t extent_location;   // LBA, little-endian di L-Table
    uint16_t parent_dir_number; // indeks parent directory dalam path table
                                // lalu: char dir_identifier[dir_id_len];
    // lalu padding byte jika diperlukan agar entry genap
};
 
// Struktur Date/Time pada Directory Record
struct iso9660_dir_time {
    uint8_t year; // tahun sejak 1900
    uint8_t month;
    uint8_t day;
    uint8_t hour;
    uint8_t minute;
    uint8_t second;
    int8_t gmt_offset; // offset dari GMT dalam interval 15 menit
};
 
// Struktur Directory Record (Entry direktori / file)
struct iso9660_dir {
    uint8_t length;
    uint8_t ext_attr_length;
 
    uint32_t extent_le;
    uint32_t extent_be;
 
    uint32_t size_le;
    uint32_t size_be;
 
    uint8_t date[7];
 
    uint8_t flags;
 
    uint8_t file_unit_size;
    uint8_t interleave_gap;
 
    uint16_t volume_seq_le;
    uint16_t volume_seq_be;
 
    uint8_t name_len;
 
    char name[];
} __attribute__((packed));
 
#define iOS9660_DIR_FLAG (1 << 1)
#define iOS9660_ASSOCIATED_FILE_FLAG (1 << 2)
 
fs_operations_t* iso9660_fs_operations(void);
vops_file_t* iso9660_file_operations(void);
vops_lnk_t* iso9660_lnk_operations(void);
 
 
int iso9660_lookup(struct fs_instance* instance, char* path, dentry_ptr parent,
                   dentry_ptr* out);
int iso9660_read(vnode_t* vnode, void* buf, size_t len, size_t offset);
int iso9660_readlink(vnode_t* vnode, char* buf, size_t len);
 
#endif // __FS__ISO9660_H__