iso9660.h

创建一个符合iso-9660标准的iso文件系统

/* @(#)iso9660.h	1.13 00/04/19 joerg */
/*
 * Header file iso9660.h - assorted structure definitions and typecasts.
 * specific to iso9660 filesystem.

   Written by Eric Youngdale (1993).

   Copyright 1993 Yggdrasil Computing, Incorporated
   Copyright (c) 1999,2000 J. Schilling

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#ifndef _ISOFS_FS_H
#define _ISOFS_FS_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_PRIMARY		1
#define ISO_VD_SUPPLEMENTARY	2     /* Used by Joliet */
#define ISO_VD_END		255

#define ISO_STANDARD_ID		"CD001"

#define EL_TORITO_ID		"EL TORITO SPECIFICATION"
#define EL_TORITO_ARCH_x86	0
#define EL_TORITO_ARCH_PPC	1
#define EL_TORITO_ARCH_MAC	2

#define EL_TORITO_BOOTABLE	0x88
#define EL_TORITO_NOT_BOOTABLE	0

#define EL_TORITO_MEDIA_NOEMUL	0
#define EL_TORITO_MEDIA_12FLOP	1
#define EL_TORITO_MEDIA_144FLOP	2
#define EL_TORITO_MEDIA_288FLOP	3
#define EL_TORITO_MEDIA_HD	4

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 escape_sequences		[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)];
};

/* El Torito Boot Record Volume Descriptor */
struct eltorito_boot_descriptor {
	char type			[ISODCL (  1,    1)]; /* 711 */
	char id				[ISODCL (  2,    6)];
	char version			[ISODCL (  7,    7)]; /* 711 */
	char system_id			[ISODCL (  8,   39)];
	char unused2			[ISODCL ( 40,   71)];
	char bootcat_ptr		[ISODCL ( 72 ,  75)];
	char unused5			[ISODCL ( 76, 2048)];
};

/* Validation entry for El Torito */
struct eltorito_validation_entry {
	char headerid			[ISODCL (  1,    1)]; /* 711 */
	char arch			[ISODCL (  2,    2)];
	char pad1			[ISODCL (  3,    4)]; /* 711 */
	char id				[ISODCL (  5,   28)]; /* CD devel/man*/
	char cksum			[ISODCL ( 29,   30)];
	char key1			[ISODCL ( 31,   31)];
	char key2			[ISODCL ( 32,   32)];
};

/* El Torito initial/default entry in boot catalog */
struct eltorito_defaultboot_entry {
	char boot_id			[ISODCL (  1,    1)]; /* 711 */
	char boot_media			[ISODCL (  2,    2)];
	char loadseg			[ISODCL (  3,    4)]; /* 711 */
	char sys_type			[ISODCL (  5,    5)];
	char pad1			[ISODCL (  6,    6)];
	char nsect			[ISODCL (  7,    8)];
	char bootoff			[ISODCL (  9,   12)];
	char pad2			[ISODCL ( 13,   32)];
};

/*
 * XXX JS: The next two structures have odd lengths!
 * Some compilers (e.g. on Sun3/mc68020) padd the structures to even length.
 * For this reason, we cannot use sizeof (struct iso_path_table) or
 * sizeof (struct iso_directory_record) to compute on disk sizes.
 * Instead, we use offsetof(..., name) and add the name size.
 * See mkisofs.h
 */

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

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

/*
 * A ISO filename is: "abcde.eee;1" -> <filename> '.' <ext> ';' <version #>
 *
 * The maximum needed string length is:
 *	30 chars (filename + ext)
 * +	 2 chars ('.' + ';')
 * +	   strlen("32767")
 * +	   null byte
 * ================================
 * =	38 chars
 */
#define	LEN_ISONAME	31
#define	MAX_ISONAME	37

struct iso_directory_record {
	unsigned 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 */
	unsigned char name_len		[ISODCL (33, 33)]; /* 711 */
	char name			[MAX_ISONAME+1]; /* Not really, but we need something here */
};


/*
 * Iso directory flags.
 */
#define	ISO_FILE	0	/* Not really a flag...			*/
#define	ISO_EXISTENCE	1	/* Do not make existence known (hidden)	*/
#define	ISO_DIRECTORY	2	/* This file is a directory		*/
#define	ISO_ASSOCIATED	4	/* This file is an assiciated file	*/
#define	ISO_RECORD	8	/* Record format in extended attr. != 0	*/
#define	ISO_PROTECTION	16	/* No read/execute perm. in ext. attr.	*/
#define	ISO_DRESERVED1	32	/* Reserved bit 5			*/
#define	ISO_DRESERVED2	64	/* Reserved bit 6			*/
#define	ISO_MULTIEXTENT	128	/* Not final entry of a mult. ext. file	*/


struct iso_ext_attr_record {
	char owner			[ISODCL (1, 4)];     /* 723 */
	char group			[ISODCL (5, 8)];     /* 723 */
	char permissions		[ISODCL (9, 10)];    /* 16 bits */
	char creation_date		[ISODCL (11, 27)];   /* 8.4.26.1 */
	char modification_date		[ISODCL (28, 44)];   /* 8.4.26.1 */
	char expiration_date		[ISODCL (45, 61)];   /* 8.4.26.1 */
	char effective_date		[ISODCL (62, 78)];   /* 8.4.26.1 */
	char record_format		[ISODCL (79, 79)];   /* 711 */
	char record_attributes		[ISODCL (80, 80)];   /* 711 */
	char record_length		[ISODCL (81, 84)];   /* 723 */
	char system_id			[ISODCL (85, 116)];  /* achars */
	char system_use			[ISODCL (117, 180)];
	char ext_attr_version		[ISODCL (181, 181)]; /* 711 */
	char esc_seq_len		[ISODCL (182, 182)]; /* 711 */
	char reserved			[ISODCL (183, 246)]; /* for future use */
	char appl_use_len		[ISODCL (247, 250)]; /* 723 */
	char appl_use[1];		/* really more */
/*	char esc_seq[];			escape sequences recorded after appl_use */
};

/*
 * Iso extended attribute permissions.
 */
#define	ISO_GS_READ		0x0001	/* System Group Read */
#define	ISO_BIT_1		0x0002
#define	ISO_GS_EXEC		0x0004	/* System Group Execute */
#define	ISO_BIT_3		0x0008

#define	ISO_O_READ		0x0010	/* Owner Read */
#define	ISO_BIT_5		0x0020
#define	ISO_O_EXEC		0x0040	/* Owner Exexute */
#define	ISO_BIT_7		0x0080

#define	ISO_G_READ		0x0100	/* Group Read */
#define	ISO_BIT_9		0x0200
#define	ISO_G_EXEC		0x0400	/* Group Execute */
#define	ISO_BIT_11		0x0800

#define	ISO_W_READ		0x1000	/* World (other) Read */
#define	ISO_BIT_13		0x2000
#define	ISO_W_EXEC		0x4000	/* World (other) Execute */
#define	ISO_BIT_15		0x8000

#define	ISO_MB_ONE		(ISO_BIT_1|ISO_BIT_3|ISO_BIT_5|ISO_BIT_7| \
				 ISO_BIT_9|ISO_BIT_11|ISO_BIT_13|ISO_BIT_15)

/*
 * Extended Attributes record according to Yellow Book.
 */
struct iso_xa_dir_record {
	char group_id			[ISODCL (1, 2)];
	char user_id			[ISODCL (3, 4)];
	char attributes			[ISODCL (5, 6)];
	char signature			[ISODCL (7, 8)];
	char file_number		[ISODCL (9, 9)];
	char reserved			[ISODCL (10, 14)];
};
#endif