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iso.h

/**   $MirOS: src/sys/isofs/cd9660/iso.h,v 1.2 2008/10/31 21:11:38 tg Exp $ */
/*    $OpenBSD: iso.h,v 1.13 2003/06/02 23:28:05 millert Exp $    */
/*    $NetBSD: iso.h,v 1.20 1997/07/07 22:45:34 cgd Exp $   */

/*-
 * Copyright (c) 1994
 *    The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley
 * by Pace Willisson (pace@blitz.com).  The Rock Ridge Extension
 * Support code is derived from software contributed to Berkeley
 * by Atsushi Murai (amurai@spec.co.jp).
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *    @(#)iso.h   8.4 (Berkeley) 12/5/94
 */

/*
 * Definitions describing ISO9660 file system structure, as well as
 * the functions necessary to access fields of ISO9660 file system
 * structures.
 */

#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
#define ISO_VD_END 255

#define ISO_STANDARD_ID "CD001"
#define ISO_ECMA_ID     "CDW01"

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)];
};
#define ISO_DEFAULT_BLOCK_SHIFT           11
#define ISO_DEFAULT_BLOCK_SIZE            (1<<ISO_DEFAULT_BLOCK_SHIFT)

/*
 * Used by Microsoft Joliet extension to ISO9660. Almost the same
 * as PVD, but byte position 8 is a flag, and 89-120 is for escape.
 */

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)];
      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)];
      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)];
};

struct iso_directory_record {
      char length             [ISODCL (1, 1)]; /* 711 */
      char ext_attr_length          [ISODCL (2, 2)]; /* 711 */
      u_char extent                 [ISODCL (3, 10)]; /* 733 */
      u_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];              /* XXX */
};
/* can't take sizeof(iso_directory_record), because of possible alignment
   of the last entry (34 instead of 33) */
#define ISO_DIRECTORY_RECORD_SIZE   33

struct iso_extended_attributes {
      u_char owner                  [ISODCL (1, 4)]; /* 723 */
      u_char group                  [ISODCL (5, 8)]; /* 723 */
      u_char perm             [ISODCL (9, 10)]; /* 9.5.3 */
      char ctime              [ISODCL (11, 27)]; /* 8.4.26.1 */
      char mtime              [ISODCL (28, 44)]; /* 8.4.26.1 */
      char xtime              [ISODCL (45, 61)]; /* 8.4.26.1 */
      char ftime              [ISODCL (62, 78)]; /* 8.4.26.1 */
      char recfmt             [ISODCL (79, 79)]; /* 711 */
      char recattr                  [ISODCL (80, 80)]; /* 711 */
      u_char reclen                 [ISODCL (81, 84)]; /* 723 */
      char system_id                [ISODCL (85, 116)]; /* achars */
      char system_use               [ISODCL (117, 180)];
      char version                  [ISODCL (181, 181)]; /* 711 */
      char len_esc                  [ISODCL (182, 182)]; /* 711 */
      char reserved                 [ISODCL (183, 246)];
      u_char len_au                 [ISODCL (247, 250)]; /* 723 */
};

static __inline int isonum_711(u_char *) __attribute__ ((__unused__));
static __inline int isonum_712(char *) __attribute__ ((__unused__));
static __inline int isonum_721(u_char *) __attribute__ ((__unused__));
static __inline int isonum_722(u_char *) __attribute__ ((__unused__));
static __inline int isonum_723(u_char *) __attribute__ ((__unused__));
static __inline int isonum_731(u_char *) __attribute__ ((__unused__));
static __inline int isonum_732(u_char *) __attribute__ ((__unused__));
static __inline int isonum_733(u_char *) __attribute__ ((__unused__));

/* 7.1.1: unsigned char */
static __inline int
isonum_711(u_char *p)
{
      return *p;
}

/* 7.1.2: signed(?) char */
static __inline int
isonum_712(char *p)
{
      return *p;
}

/* 7.2.1: unsigned little-endian 16-bit value.  NOT USED IN KERNEL. */
static __inline int
isonum_721(u_char *p)
{
#if defined(UNALIGNED_ACCESS) && (BYTE_ORDER == LITTLE_ENDIAN)
      return *(u_int16t *)p;
#else
      return *p|((char)p[1] << 8);
#endif
}

/* 7.2.2: unsigned big-endian 16-bit value.  NOT USED IN KERNEL. */
static __inline int     
isonum_722(unsigned char *p)
{
#if defined(UNALIGNED_ACCESS) && (BYTE_ORDER == BIG_ENDIAN)
      return *(u_int16t *)p;
#else
      return ((char)*p << 8)|p[1];
#endif
} 

/* 7.2.3: unsigned both-endian (little, then big) 16-bit value */
static __inline int
isonum_723(u_char *p)
{
#if defined(UNALIGNED_ACCESS) && \
    ((BYTE_ORDER == LITTLE_ENDIAN) || (BYTE_ORDER == BIG_ENDIAN))
#if BYTE_ORDER == LITTLE_ENDIAN
      return *(u_int16t *)p;
#else
      return *(u_int16t *)(p + 2);
#endif
#else /* !UNALIGNED_ACCESS or weird byte order */
      return *p|(p[1] << 8);
#endif
}

/* 7.3.1: unsigned little-endian 32-bit value.  NOT USED IN KERNEL. */
static __inline int
isonum_731(u_char *p)
{
#if defined(UNALIGNED_ACCESS) && (BYTE_ORDER == LITTLE_ENDIAN)
      return *(u_int32t *)p;
#else
      return *p|(p[1] << 8)|(p[2] << 16)|(p[3] << 24);
#endif
}

/* 7.3.2: unsigned big-endian 32-bit value.  NOT USED IN KERNEL. */
static __inline int
isonum_732(unsigned char *p)
{
#if defined(UNALIGNED_ACCESS) && (BYTE_ORDER == BIG_ENDIAN)
      return *(u_int32t *)p;
#else
      return (*p << 24)|(p[1] << 16)|(p[2] << 8)|p[3];
#endif
}

/* 7.3.3: unsigned both-endian (little, then big) 32-bit value */
static __inline int
isonum_733(u_char *p)
{
#if defined(UNALIGNED_ACCESS) && \
    ((BYTE_ORDER == LITTLE_ENDIAN) || (BYTE_ORDER == BIG_ENDIAN))
#if BYTE_ORDER == LITTLE_ENDIAN
      return *(u_int32t *)p;
#else
      return *(u_int32t *)(p + 4);
#endif
#else /* !UNALIGNED_ACCESS or weird byte order */
      return *p|(p[1] << 8)|(p[2] << 16)|(p[3] << 24);
#endif
}

/*
 * Associated files have a leading '='.
 */
#define     ASSOCCHAR   '='

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