/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _ISOFS_FS_H
#define _ISOFS_FS_H

#include <linux/types.h>
#include <linux/magic.h>

/*
 * The isofs filesystem constants/structures
 */

/* This part borrowed from the bsd386 isofs */
#define ISODCL(from, to) (to - from + 1)

struct iso_volume_descriptor {
        __u8 type[ISODCL(1,1)]; /* 711 */
        char id[ISODCL(2,6)];
        __u8 version[ISODCL(7,7)];
        __u8 data[ISODCL(8,2048)];
};

/* volume descriptor types */
#define ISO_VD_PRIMARY 1
#define ISO_VD_SUPPLEMENTARY 2
#define ISO_VD_END 255

#define ISO_STANDARD_ID "CD001"

struct iso_primary_descriptor {
        __u8 type                       [ISODCL (  1,   1)]; /* 711 */
        char id                         [ISODCL (  2,   6)];
        __u8 version                    [ISODCL (  7,   7)]; /* 711 */
        __u8 unused1                    [ISODCL (  8,   8)];
        char system_id                  [ISODCL (  9,  40)]; /* achars */
        char volume_id                  [ISODCL ( 41,  72)]; /* dchars */
        __u8 unused2                    [ISODCL ( 73,  80)];
        __u8 volume_space_size          [ISODCL ( 81,  88)]; /* 733 */
        __u8 unused3                    [ISODCL ( 89, 120)];
        __u8 volume_set_size            [ISODCL (121, 124)]; /* 723 */
        __u8 volume_sequence_number     [ISODCL (125, 128)]; /* 723 */
        __u8 logical_block_size         [ISODCL (129, 132)]; /* 723 */
        __u8 path_table_size            [ISODCL (133, 140)]; /* 733 */
        __u8 type_l_path_table          [ISODCL (141, 144)]; /* 731 */
        __u8 opt_type_l_path_table      [ISODCL (145, 148)]; /* 731 */
        __u8 type_m_path_table          [ISODCL (149, 152)]; /* 732 */
        __u8 opt_type_m_path_table      [ISODCL (153, 156)]; /* 732 */
        __u8 root_directory_record      [ISODCL (157, 190)]; /* 9.1 */
        char volume_set_id              [ISODCL (191, 318)]; /* dchars */
        char publisher_id               [ISODCL (319, 446)]; /* achars */
        char preparer_id                [ISODCL (447, 574)]; /* achars */
        char application_id             [ISODCL (575, 702)]; /* achars */
        char copyright_file_id          [ISODCL (703, 739)]; /* 7.5 dchars */
        char abstract_file_id           [ISODCL (740, 776)]; /* 7.5 dchars */
        char bibliographic_file_id      [ISODCL (777, 813)]; /* 7.5 dchars */
        __u8 creation_date              [ISODCL (814, 830)]; /* 8.4.26.1 */
        __u8 modification_date          [ISODCL (831, 847)]; /* 8.4.26.1 */
        __u8 expiration_date            [ISODCL (848, 864)]; /* 8.4.26.1 */
        __u8 effective_date             [ISODCL (865, 881)]; /* 8.4.26.1 */
        __u8 file_structure_version     [ISODCL (882, 882)]; /* 711 */
        __u8 unused4                    [ISODCL (883, 883)];
        __u8 application_data           [ISODCL (884, 1395)];
        __u8 unused5                    [ISODCL (1396, 2048)];
};

/* Almost the same as the primary descriptor but two fields are specified */
struct iso_supplementary_descriptor {
        __u8 type                       [ISODCL (  1,   1)]; /* 711 */
        char id                         [ISODCL (  2,   6)];
        __u8 version                    [ISODCL (  7,   7)]; /* 711 */
        __u8 flags                      [ISODCL (  8,   8)]; /* 853 */
        char system_id                  [ISODCL (  9,  40)]; /* achars */
        char volume_id                  [ISODCL ( 41,  72)]; /* dchars */
        __u8 unused2                    [ISODCL ( 73,  80)];
        __u8 volume_space_size          [ISODCL ( 81,  88)]; /* 733 */
        __u8 escape                     [ISODCL ( 89, 120)]; /* 856 */
        __u8 volume_set_size            [ISODCL (121, 124)]; /* 723 */
        __u8 volume_sequence_number     [ISODCL (125, 128)]; /* 723 */
        __u8 logical_block_size         [ISODCL (129, 132)]; /* 723 */
        __u8 path_table_size            [ISODCL (133, 140)]; /* 733 */
        __u8 type_l_path_table          [ISODCL (141, 144)]; /* 731 */
        __u8 opt_type_l_path_table      [ISODCL (145, 148)]; /* 731 */
        __u8 type_m_path_table          [ISODCL (149, 152)]; /* 732 */
        __u8 opt_type_m_path_table      [ISODCL (153, 156)]; /* 732 */
        __u8 root_directory_record      [ISODCL (157, 190)]; /* 9.1 */
        char volume_set_id              [ISODCL (191, 318)]; /* dchars */
        char publisher_id               [ISODCL (319, 446)]; /* achars */
        char preparer_id                [ISODCL (447, 574)]; /* achars */
        char application_id             [ISODCL (575, 702)]; /* achars */
        char copyright_file_id          [ISODCL (703, 739)]; /* 7.5 dchars */
        char abstract_file_id           [ISODCL (740, 776)]; /* 7.5 dchars */
        char bibliographic_file_id      [ISODCL (777, 813)]; /* 7.5 dchars */
        __u8 creation_date              [ISODCL (814, 830)]; /* 8.4.26.1 */
        __u8 modification_date          [ISODCL (831, 847)]; /* 8.4.26.1 */
        __u8 expiration_date            [ISODCL (848, 864)]; /* 8.4.26.1 */
        __u8 effective_date             [ISODCL (865, 881)]; /* 8.4.26.1 */
        __u8 file_structure_version     [ISODCL (882, 882)]; /* 711 */
        __u8 unused4                    [ISODCL (883, 883)];
        __u8 application_data           [ISODCL (884, 1395)];
        __u8 unused5                    [ISODCL (1396, 2048)];
};


#define HS_STANDARD_ID "CDROM"

struct  hs_volume_descriptor {
        __u8 foo                        [ISODCL (  1,   8)]; /* 733 */
        __u8 type                       [ISODCL (  9,   9)]; /* 711 */
        char id                         [ISODCL ( 10,  14)];
        __u8 version                    [ISODCL ( 15,  15)]; /* 711 */
        __u8 data[ISODCL(16,2048)];
};


struct hs_primary_descriptor {
        __u8 foo                        [ISODCL (  1,   8)]; /* 733 */
        __u8 type                       [ISODCL (  9,   9)]; /* 711 */
        __u8 id                         [ISODCL ( 10,  14)];
        __u8 version                    [ISODCL ( 15,  15)]; /* 711 */
        __u8 unused1                    [ISODCL ( 16,  16)]; /* 711 */
        char system_id                  [ISODCL ( 17,  48)]; /* achars */
        char volume_id                  [ISODCL ( 49,  80)]; /* dchars */
        __u8 unused2                    [ISODCL ( 81,  88)]; /* 733 */
        __u8 volume_space_size          [ISODCL ( 89,  96)]; /* 733 */
        __u8 unused3                    [ISODCL ( 97, 128)]; /* 733 */
        __u8 volume_set_size            [ISODCL (129, 132)]; /* 723 */
        __u8 volume_sequence_number     [ISODCL (133, 136)]; /* 723 */
        __u8 logical_block_size         [ISODCL (137, 140)]; /* 723 */
        __u8 path_table_size            [ISODCL (141, 148)]; /* 733 */
        __u8 type_l_path_table          [ISODCL (149, 152)]; /* 731 */
        __u8 unused4                    [ISODCL (153, 180)]; /* 733 */
        __u8 root_directory_record      [ISODCL (181, 214)]; /* 9.1 */
};

/* We use this to help us look up the parent inode numbers. */

struct iso_path_table{
        __u8  name_len[2];      /* 721 */
        __u8  extent[4];        /* 731 */
        __u8  parent[2];        /* 721 */
        char name[];
} __attribute__((packed));

/* high sierra is identical to iso, except that the date is only 6 bytes, and
   there is an extra reserved byte after the flags */

struct iso_directory_record {
        __u8 length                     [ISODCL (1, 1)]; /* 711 */
        __u8 ext_attr_length            [ISODCL (2, 2)]; /* 711 */
        __u8 extent                     [ISODCL (3, 10)]; /* 733 */
        __u8 size                       [ISODCL (11, 18)]; /* 733 */
        __u8 date                       [ISODCL (19, 25)]; /* 7 by 711 */
        __u8 flags                      [ISODCL (26, 26)];
        __u8 file_unit_size             [ISODCL (27, 27)]; /* 711 */
        __u8 interleave                 [ISODCL (28, 28)]; /* 711 */
        __u8 volume_sequence_number     [ISODCL (29, 32)]; /* 723 */
        __u8 name_len                   [ISODCL (33, 33)]; /* 711 */
        char name                       [];
} __attribute__((packed));

#define ISOFS_BLOCK_BITS 11
#define ISOFS_BLOCK_SIZE 2048

#define ISOFS_BUFFER_SIZE(INODE) ((INODE)->i_sb->s_blocksize)
#define ISOFS_BUFFER_BITS(INODE) ((INODE)->i_sb->s_blocksize_bits)

#endif /* _ISOFS_FS_H */