/*
 * libkysdk-system's Library
 *
 * Copyright (C) 2025, KylinSoft Co., Ltd.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this library.  If not, see <https://www.gnu.org/licenses/>.
 *
 * Authors: ShaoShuai Tian <tianshaoshuai@kylinos.cn>
 *
 */

/* From the linux kernel */

#ifndef _ISO_FS_H
#define _ISO_FS_H 1

#include "bswap.h"

/*
 * The isofs filesystem constants/structures
 */

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

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

/* volume descriptor types */
#define ISO_VD_BOOT 0
#define ISO_VD_PRIMARY 1
#define ISO_VD_SUPPLEMENTARY 2
#define ISO_VD_END 255

#define ISO_STANDARD_ID "CD001"

struct iso_primary_descriptor {
	char type			[ISODCL (  1,   1)]; /* 711 */
	char id				[ISODCL (  2,   6)];
	char version			[ISODCL (  7,   7)]; /* 711 */
	char unused1			[ISODCL (  8,   8)];
	char system_id			[ISODCL (  9,  40)]; /* achars */
	char volume_id			[ISODCL ( 41,  72)]; /* dchars */
	char unused2			[ISODCL ( 73,  80)];
	char volume_space_size		[ISODCL ( 81,  88)]; /* 733 */
	char unused3			[ISODCL ( 89, 120)];
	char volume_set_size		[ISODCL (121, 124)]; /* 723 */
	char volume_sequence_number	[ISODCL (125, 128)]; /* 723 */
	char logical_block_size		[ISODCL (129, 132)]; /* 723 */
	char path_table_size		[ISODCL (133, 140)]; /* 733 */
	char type_l_path_table		[ISODCL (141, 144)]; /* 731 */
	char opt_type_l_path_table	[ISODCL (145, 148)]; /* 731 */
	char type_m_path_table		[ISODCL (149, 152)]; /* 732 */
	char opt_type_m_path_table	[ISODCL (153, 156)]; /* 732 */
	char 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 */
	char creation_date		[ISODCL (814, 830)]; /* 8.4.26.1 */
	char modification_date		[ISODCL (831, 847)]; /* 8.4.26.1 */
	char expiration_date		[ISODCL (848, 864)]; /* 8.4.26.1 */
	char effective_date		[ISODCL (865, 881)]; /* 8.4.26.1 */
	char file_structure_version	[ISODCL (882, 882)]; /* 711 */
	char unused4			[ISODCL (883, 883)];
	char application_data		[ISODCL (884, 1395)];
	char unused5			[ISODCL (1396, 2048)];
};

/* Almost the same as the primary descriptor but two fields are specified */
struct iso_supplementary_descriptor {
	char type			[ISODCL (  1,   1)]; /* 711 */
	char id				[ISODCL (  2,   6)];
	char version			[ISODCL (  7,   7)]; /* 711 */
	char flags			[ISODCL (  8,   8)]; /* 853 */
	char system_id			[ISODCL (  9,  40)]; /* achars */
	char volume_id			[ISODCL ( 41,  72)]; /* dchars */
	char unused2			[ISODCL ( 73,  80)];
	char volume_space_size		[ISODCL ( 81,  88)]; /* 733 */
	char escape			[ISODCL ( 89, 120)]; /* 856 */
	char volume_set_size		[ISODCL (121, 124)]; /* 723 */
	char volume_sequence_number	[ISODCL (125, 128)]; /* 723 */
	char logical_block_size		[ISODCL (129, 132)]; /* 723 */
	char path_table_size		[ISODCL (133, 140)]; /* 733 */
	char type_l_path_table		[ISODCL (141, 144)]; /* 731 */
	char opt_type_l_path_table	[ISODCL (145, 148)]; /* 731 */
	char type_m_path_table		[ISODCL (149, 152)]; /* 732 */
	char opt_type_m_path_table	[ISODCL (153, 156)]; /* 732 */
	char 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 */
	char creation_date		[ISODCL (814, 830)]; /* 8.4.26.1 */
	char modification_date		[ISODCL (831, 847)]; /* 8.4.26.1 */
	char expiration_date		[ISODCL (848, 864)]; /* 8.4.26.1 */
	char effective_date		[ISODCL (865, 881)]; /* 8.4.26.1 */
	char file_structure_version	[ISODCL (882, 882)]; /* 711 */
	char unused4			[ISODCL (883, 883)];
	char application_data		[ISODCL (884, 1395)];
	char unused5			[ISODCL (1396, 2048)];
};

#define HS_STANDARD_ID "CDROM"

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


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

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

struct iso_path_table{
	char  name_len[1];		  /* 711 */
	char  ext_attr_length[1]; /* 711 */
	char  extent[4];		  /* 731 */
	char  parent[2];	      /* 721 */
	char  name[1];
};

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

/* 8 bit numbers */
__inline unsigned char isonum_711(char *p);
__inline char isonum_712(char *p);

/* 16 bit numbers */
__inline unsigned short isonum_721(char *p);
__inline unsigned short isonum_722(char *p);
__inline unsigned short isonum_723(char *p);

/* 32 bit numbers */
__inline unsigned int isonum_731(char *p);
__inline unsigned int isonum_732(char *p);
__inline unsigned int isonum_733(char *p);


/* 8 bit numbers */
__inline unsigned char isonum_711(char *p)
{
	return *(unsigned char *)p;
}
__inline char isonum_712(char *p)
{
	return *p;
}

/* 16 bit numbers */
__inline unsigned short isonum_721(char *p)
{
	return le2me_16(*(unsigned short *)p);
}
__inline unsigned short isonum_722(char *p)
{
	return be2me_16(*(unsigned short *)p);
}
__inline unsigned short isonum_723(char *p)
{
	/* Ignore bigendian datum due to broken mastering programs */
	return le2me_16(*(unsigned short *)p);
}

/* 32 bit numbers */
__inline unsigned int isonum_731(char *p)
{
	return le2me_32(*(unsigned int *)p);
}

__inline unsigned int isonum_732(char *p)
{
	return be2me_32(*(unsigned int *)p);
}

__inline unsigned int isonum_733(char *p)
{
	/* Ignore bigendian datum due to broken mastering programs */
	return le2me_32(*(unsigned int *)p);
}

#endif /*_ISOFS_H*/

