/* 

    Copyright (c) 2005, 2006, 2008, 2012 Rocky Bernstein <rocky@cpan.org>

    Copyright (c) 2001-2002  Ben Fennema <bfennema@falcon.csc.calpoly.edu>

    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 3 of the License, 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, see <http://www.gnu.org/licenses/>.

*/

/*

 * Some portions taken from FreeBSD ecma167-udf.h which states:

 * Copyright (c) 2001, 2002 Scott Long <scottl@freebsd.org>

 * All rights reserved.

 *

 * 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.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.

 */

/*!

 * \file ecma_167.h

 *

 * \brief Definitions based on ECMA-167 3rd edition (June 1997)

 * See http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-167.pdf

*/

#ifndef CDIO_ECMA_167_H

#define CDIO_ECMA_167_H 1

#include <cdio/types.h>

/**

   Imagine the below enum values as \#define'd values rather than

   distinct values of an enum.

*/

typedef enum {

  VSD_STD_ID_SIZE    =    5, /** Volume Structure Descriptor (ECMA 167r3 

                                2/9.1) */

  UDF_REGID_ID_SIZE  =   23, /**< See identifier (ECMA 167r3 1/7.4) */

  UDF_VOLID_SIZE     =   32,

  UDF_FID_SIZE       =   38,

  UDF_VOLSET_ID_SIZE =  128

} ecma_167_enum1_t ;

/** Tag Identifier (ECMA 167r3 3/7.2.1) */

typedef enum {

  TAGID_PRI_VOL          = 0x0001,

  TAGID_ANCHOR           = 0x0002,

  TAGID_VOL              = 0x0003,

  TAGID_IMP_VOL          = 0x0004,

  TAGID_PARTITION        = 0x0005,

  TAGID_LOGVOL           = 0x0006,

  TAGID_UNALLOC_SPACE    = 0x0007,

  TAGID_TERM             = 0x0008,

  TAGID_LOGVOL_INTEGRITY = 0x0009,

  TAGID_FSD              = 0x0100,

  TAGID_FID              = 0x0101,

  TAGID_AED              = 0x0102,

  TAGID_IE               = 0x0103,

  TAGID_TE               = 0x0104,

  TAGID_FILE_ENTRY       = 0x0105,

  TAGID_EAHD             = 0x0106,

  TAGID_USE              = 0x0107,

  TAGID_SBD              = 0x0108,

  TAGID_PIE              = 0x0109,

  TAGID_EFE              = 0x010A,

} tag_id_t ;

/** Character Set Type (ECMA 167r3 1/7.2.1.1) */

typedef enum {

  CHARSPEC_TYPE_CS0 = 0x00,     /**< Section 1/7.2.2 */

  CHARSPEC_TYPE_CS1 = 0x01,     /**< Section 1/7.2.3 */

  CHARSPEC_TYPE_CS2 = 0x02,     /**< Section 1/7.2.4 */

  CHARSPEC_TYPE_CS3 = 0x03,     /**< Section 1/7.2.5 */

  CHARSPEC_TYPE_CS4 = 0x04,     /**< Section 1/7.2.6 */

  CHARSPEC_TYPE_CS5 = 0x05,     /**< Section 1/7.2.7 */

  CHARSPEC_TYPE_CS6 = 0x06,     /**< Section 1/7.2.8 */

  CHARSPEC_TYPE_CS7 = 0x07,     /**< Section 1/7.2.9 */

  CHARSPEC_TYPE_CS8 = 0x08,     /**< Section 1/7.2.10 */

} udf_charspec_enum_t;

typedef uint8_t  udf_Uint8_t;  /*! Section 1/7/1.1 */

typedef uint16_t udf_Uint16_t; /*! Section 1/7.1.3 */

typedef uint32_t udf_Uint32_t; /*! Section 1/7.1.5 */

typedef uint64_t udf_Uint64_t; /*! Section 1/7.1.7 */

typedef char     udf_dstring;  /*! Section 1/7.1.12 */

#define UDF_LENGTH_MASK 0x3fffffff

PRAGMA_BEGIN_PACKED

/** Character set specification (ECMA 167r3 1/7.2.1) */

struct udf_charspec_s

{

  udf_Uint8_t   charset_type;

  udf_Uint8_t   charset_info[63];

} GNUC_PACKED;

typedef struct udf_charspec_s udf_charspec_t;

/** Timestamp (ECMA 167r3 1/7.3) */

struct udf_timestamp_s

{

  udf_Uint16_t          type_tz;

  udf_Uint16_t          year;

  udf_Uint8_t           month;

  udf_Uint8_t           day;

  udf_Uint8_t           hour;

  udf_Uint8_t           minute;

  udf_Uint8_t           second;

  udf_Uint8_t           centiseconds;

  udf_Uint8_t           hundreds_of_microseconds;

  udf_Uint8_t           microseconds;

} GNUC_PACKED;

typedef struct udf_timestamp_s udf_timestamp_t;

/** Type and Time Zone (ECMA 167r3 1/7.3.1) 

    Imagine the below enum values as \#define'd values rather than

    distinct values of an enum.

*/

typedef enum { 

  TIMESTAMP_TYPE_CUT        =   0x0000,

  TIMESTAMP_TYPE_LOCAL      =   0x1000,

  TIMESTAMP_TYPE_AGREEMENT  =   0x2000,

  TIMESTAMP_TYPE_MASK       =   0xF000,

  TIMESTAMP_TIMEZONE_MASK   =   0x0FFF,

} ecma_167_timezone_enum_t ;

#define TIMESTAMP_TYPE_MASK             0xF000

#define TIMESTAMP_TYPE_CUT              0x0000

#define TIMESTAMP_TYPE_LOCAL            0x1000

#define TIMESTAMP_TYPE_AGREEMENT        0x2000

#define TIMESTAMP_TIMEZONE_MASK         0x0FFF

struct udf_id_suffix_s

{

  udf_Uint16_t  udf_revision;

  udf_Uint8_t   os_class;

  udf_Uint8_t   os_identifier;

  udf_Uint8_t   reserved[4];

} GNUC_PACKED;

typedef struct udf_id_suffix_s udf_id_suffix_t;

/** Entity identifier (ECMA 167r3 1/7.4) */

struct udf_regid_s

{

  udf_Uint8_t           flags;

  udf_Uint8_t           id[UDF_REGID_ID_SIZE];

  udf_id_suffix_t       id_suffix;

} GNUC_PACKED;

typedef struct udf_regid_s udf_regid_t;

/** Flags (ECMA 167r3 1/7.4.1) */

#define ENTITYID_FLAGS_DIRTY            0x00

#define ENTITYID_FLAGS_PROTECTED        0x01

/** Volume Structure Descriptor (ECMA 167r3 2/9.1) */

struct vol_struct_desc_s

{

  udf_Uint8_t           struct_type;

  udf_Uint8_t           std_id[VSD_STD_ID_SIZE];

  udf_Uint8_t           struct_version;

  udf_Uint8_t           struct_data[2041];

} GNUC_PACKED;

/** Standard Identifier (EMCA 167r2 2/9.1.2) */

#define VSD_STD_ID_NSR02                "NSR02" /* (3/9.1) */

/** Standard Identifier (ECMA 167r3 2/9.1.2) */

/* The below const definitions are to faciltate debugging of the

   values #define'd below. */

extern const char VSD_STD_ID_BEA01[sizeof("BEA01")-1];

extern const char VSD_STD_ID_BOOT2[sizeof("BOOT2")-1];

extern const char VSD_STD_ID_CD001[sizeof("CD001")-1];

extern const char VSD_STD_ID_CDW01[sizeof("CDW02")-1];

extern const char VSD_STD_ID_NSR03[sizeof("NSR03")-1];

extern const char VSD_STD_ID_TEA01[sizeof("TEA01")-1];

#define VSD_STD_ID_BEA01                "BEA01" /**< ECMA-167 2/9.2 */

#define VSD_STD_ID_BOOT2                "BOOT2" /**< ECMA-167 2/9.4 */

#define VSD_STD_ID_CD001                "CD001" /**< ECMA-119 */

#define VSD_STD_ID_CDW02                "CDW02" /**< ECMA-168 */

#define VSD_STD_ID_NSR02                "NSR02" /**< ECMA-167, 3/9.1 

                                               NOTE: ECMA-167, 2nd edition */

#define VSD_STD_ID_NSR03                "NSR03" /**< ECMA-167 3/9.1 */

#define VSD_STD_ID_TEA01                "TEA01" /**< ECMA-168 2/9.3 */

/** Beginning Extended Area Descriptor (ECMA 167r3 2/9.2) */

struct beginning_extended_area_desc_s

{

  udf_Uint8_t           struct_type;

  udf_Uint8_t           std_id[VSD_STD_ID_SIZE];

  udf_Uint8_t           struct_version;

  udf_Uint8_t           struct_data[2041];

} GNUC_PACKED;

/** Terminating Extended Area Descriptor (ECMA 167r3 2/9.3) */

struct terminating_extended_area_desc_s

{

  udf_Uint8_t           struct_type;

  udf_Uint8_t           std_id[VSD_STD_ID_SIZE];

  udf_Uint8_t           struct_version;

  udf_Uint8_t           struct_data[2041];

} GNUC_PACKED;

/** Boot Descriptor (ECMA 167r3 2/9.4) */

struct boot_desc_s

{

  udf_Uint8_t           struct_type;

  udf_Uint8_t           std_ident[VSD_STD_ID_SIZE];

  udf_Uint8_t           struct_version;

  udf_Uint8_t           reserved1;

  udf_regid_t           arch_type;

  udf_regid_t           boot_ident;

  udf_Uint32_t          bool_ext_location;

  udf_Uint32_t          bool_ext_length;

  udf_Uint64_t          load_address;

  udf_Uint64_t          start_address;

  udf_timestamp_t       desc_creation_time;

  udf_Uint16_t          flags;

  udf_Uint8_t           reserved2[32];

  udf_Uint8_t           boot_use[1906];

} GNUC_PACKED;

/** Flags (ECMA 167r3 2/9.4.12) */

#define BOOT_FLAGS_ERASE                0x01

/** Extent Descriptor (ECMA 167r3 3/7.1) */

struct udf_extent_ad_s

{

  udf_Uint32_t          len;

  udf_Uint32_t          loc;

} GNUC_PACKED;

typedef struct udf_extent_ad_s udf_extent_ad_t;

/** Descriptor Tag (ECMA 167r3 3/7.2) */

struct udf_tag_s

{

  udf_Uint16_t          id;

  udf_Uint16_t          desc_version;

  udf_Uint8_t           cksum;

  udf_Uint8_t           reserved;

  udf_Uint16_t          i_serial;

  udf_Uint16_t          desc_CRC;

  udf_Uint16_t          desc_CRC_len;

  udf_Uint32_t          loc;

} GNUC_PACKED;

typedef struct udf_tag_s udf_tag_t;

/** NSR Descriptor (ECMA 167r3 3/9.1) */

struct NSR_desc_s

{

  udf_Uint8_t   struct_type;

  udf_Uint8_t   std_id[VSD_STD_ID_SIZE];

  udf_Uint8_t   struct_version;

  udf_Uint8_t   reserved;

  udf_Uint8_t   struct_data[2040];

} GNUC_PACKED;

/** Primary Volume Descriptor (ECMA 167r3 3/10.1) */

struct udf_pvd_s

{

  udf_tag_t       tag;

  udf_Uint32_t    vol_desc_seq_num;

  udf_Uint32_t    primary_vol_desc_num;

  udf_dstring     vol_ident[UDF_VOLID_SIZE];

  udf_Uint16_t    vol_seq_num;

  udf_Uint16_t    max_vol_seqnum;

  udf_Uint16_t    interchange_lvl;

  udf_Uint16_t    max_interchange_lvl;

  udf_Uint32_t    charset_list;

  udf_Uint32_t    max_charset_list;

  udf_dstring     volset_id[UDF_VOLSET_ID_SIZE];

  udf_charspec_t  desc_charset;

  udf_charspec_t  explanatory_charset;

  udf_extent_ad_t vol_abstract;

  udf_extent_ad_t vol_copyright;

  udf_regid_t     app_ident;

  udf_timestamp_t recording_time;

  udf_regid_t     imp_ident;

  udf_Uint8_t     imp_use[64];

  udf_Uint32_t    predecessor_vol_desc_seq_location;

  udf_Uint16_t    flags;

  udf_Uint8_t     reserved[22];

} GNUC_PACKED;

typedef struct udf_pvd_s udf_pvd_t;

/** Flags (ECMA 167r3 3/10.1.21) */

#define PVD_FLAGS_VSID_COMMON           0x0001

/** Anchor Volume Descriptor Pointer (ECMA 167r3 3/10.2) */

struct anchor_vol_desc_ptr_s

{

  udf_tag_t       tag;

  udf_extent_ad_t main_vol_desc_seq_ext;

  udf_extent_ad_t reserve_vol_desc_seq_ext;

  udf_Uint8_t     reserved[480];

} GNUC_PACKED;

typedef struct anchor_vol_desc_ptr_s anchor_vol_desc_ptr_t;

/** Volume Descriptor Pointer (ECMA 167r3 3/10.3) */

struct vol_desc_ptr_s

{

  udf_tag_t       tag;

  udf_Uint32_t    vol_desc_seq_num;

  udf_extent_ad_t next_vol_desc_set_ext;

  udf_Uint8_t     reserved[484];

} GNUC_PACKED;

/** Implementation Use Volume Descriptor (ECMA 167r3 3/10.4) */

struct imp_use_vol_desc_s

{

  udf_tag_t    tag;

  udf_Uint32_t vol_desc_seq_num;

  udf_regid_t  imp_id;

  udf_Uint8_t  imp_use[460];

} GNUC_PACKED;

/** Partition Descriptor (ECMA 167r3 3/10.5) */

struct partition_desc_s

{

  udf_tag_t     tag;

  udf_Uint32_t  vol_desc_seq_num;

  udf_Uint16_t  flags;

  udf_Uint16_t  number;             /**< Partition number */

  udf_regid_t   contents;

  udf_Uint8_t   contents_use[128];

  udf_Uint32_t  access_type;

  udf_Uint32_t  start_loc;

  udf_Uint32_t  part_len;

  udf_regid_t   imp_id;

  udf_Uint8_t   imp_use[128];

  udf_Uint8_t   reserved[156];

} GNUC_PACKED;

typedef struct partition_desc_s partition_desc_t;

/** Partition Flags (ECMA 167r3 3/10.5.3) */

#define PD_PARTITION_FLAGS_ALLOC        0x0001

/** Partition Contents (ECMA 167r2 3/10.5.3) */

#define PD_PARTITION_CONTENTS_NSR02     "+NSR02"

/** Partition Contents (ECMA 167r3 3/10.5.5) */

#define PD_PARTITION_CONTENTS_FDC01     "+FDC01"

#define PD_PARTITION_CONTENTS_CD001     "+CD001"

#define PD_PARTITION_CONTENTS_CDW02     "+CDW02"

#define PD_PARTITION_CONTENTS_NSR03     "+NSR03"

/** Access Type (ECMA 167r3 3/10.5.7) */

#define PD_ACCESS_TYPE_NONE             0x00000000

#define PD_ACCESS_TYPE_READ_ONLY        0x00000001

#define PD_ACCESS_TYPE_WRITE_ONCE       0x00000002

#define PD_ACCESS_TYPE_REWRITABLE       0x00000003

#define PD_ACCESS_TYPE_OVERWRITABLE     0x00000004

/** Recorded Address (ECMA 167r3 4/7.1) */

struct udf_lb_addr_s

{

  udf_Uint32_t  lba;

  udf_Uint16_t  partitionReferenceNum;

} GNUC_PACKED;

typedef struct udf_lb_addr_s udf_lb_addr_t;

/** Short Allocation Descriptor (ECMA 167r3 4/14.14.1) */

struct udf_short_ad_s

{

  udf_Uint32_t  len;

  udf_Uint32_t  pos;

} GNUC_PACKED;

typedef struct udf_short_ad_s udf_short_ad_t;

/** Long Allocation Descriptor (ECMA 167r3 4/14.14.2) */

struct udf_long_ad_s

{

  udf_Uint32_t  len;

  udf_lb_addr_t loc;

  udf_Uint8_t   imp_use[6];

} GNUC_PACKED;

typedef struct udf_long_ad_s udf_long_ad_t;

/** Logical Volume Descriptor (ECMA 167r3 3/10.6) */

struct logical_vol_desc_s

{

  udf_tag_t       tag;

  udf_Uint32_t    seq_num;

  udf_charspec_t  desc_charset;

  udf_dstring     logvol_id[128];

  udf_Uint32_t    logical_blocksize;

  udf_regid_t     domain_id;

  union {

    udf_long_ad_t fsd_loc;

    udf_Uint8_t   logvol_content_use[16];

  } lvd_use;

  udf_Uint8_t     logvol_contents_use[16];

  udf_Uint32_t    maptable_len;

  udf_Uint32_t    i_partition_maps;

  udf_regid_t     imp_id;

  udf_Uint8_t     imp_use[128];

  udf_extent_ad_t integrity_seq_ext;

  udf_Uint8_t     partition_maps[0];

} GNUC_PACKED;

typedef struct logical_vol_desc_s logical_vol_desc_t;

/** Generic Partition Map (ECMA 167r3 3/10.7.1) */

struct generic_partition_map

{

  udf_Uint8_t   partition_map_type;

  udf_Uint8_t   partition_map_length;

  udf_Uint8_t   partition_mapping[0];

} GNUC_PACKED;

/** Partition Map Type (ECMA 167r3 3/10.7.1.1) */

#define GP_PARTITION_MAP_TYPE_UNDEF     0x00

#define GP_PARTIITON_MAP_TYPE_1         0x01

#define GP_PARTITION_MAP_TYPE_2         0x02

/** Type 1 Partition Map (ECMA 167r3 3/10.7.2) */

struct generic_partition_map1

{

  udf_Uint8_t   partition_map_type;

  udf_Uint8_t   partition_map_length;

  udf_Uint16_t  vol_seq_num;

  udf_Uint16_t  i_partition;

} GNUC_PACKED;

/** Type 2 Partition Map (ECMA 167r3 3/10.7.3) */

struct generic_partition_map2

{

  udf_Uint8_t   partition_map_type;

  udf_Uint8_t   partition_map_length; 

  udf_Uint8_t   partition_id[62];

} GNUC_PACKED;

/** Unallocated Space Descriptor (ECMA 167r3 3/10.8) */

struct unalloc_space_desc_s

{

  udf_tag_t       tag;

  udf_Uint32_t    vol_desc_seq_num;

  udf_Uint32_t    i_alloc_descs;

  udf_extent_ad_t allocDescs[0];

} GNUC_PACKED;

/** Terminating Descriptor (ECMA 167r3 3/10.9) */

struct terminating_desc_s

{

  udf_tag_t    tag;

  udf_Uint8_t   reserved[496];

} GNUC_PACKED;

/** Logical Volume Integrity Descriptor (ECMA 167r3 3/10.10) */

struct logvol_integrity_desc_s

{

  udf_tag_t       tag;

  udf_timestamp_t recording_time;

  udf_Uint32_t    integrity_type;

  udf_extent_ad_t next_integrity_ext;

  udf_Uint8_t     logvol_contents_use[32];

  udf_Uint32_t    i_partitions;

  union { /* Same MSVC workaround as with struct udf_fileid_desc_s */

    udf_Uint32_t  imp_use_len;

    struct {

      udf_Uint32_t unused;

      udf_Uint32_t data[0];

    } freespace_table;

    struct {

      udf_Uint32_t unused;

      udf_Uint32_t data[0];

    } size_table;

    struct {

      udf_Uint32_t unused;

      udf_Uint32_t data[0];

    } imp_use;

  } u;

} GNUC_PACKED;

/** Integrity Type (ECMA 167r3 3/10.10.3) */

#define LVID_INTEGRITY_TYPE_OPEN        0x00000000

#define LVID_INTEGRITY_TYPE_CLOSE       0x00000001

/** Extended Allocation Descriptor (ECMA 167r3 4/14.14.3) */

struct udf_ext_ad_s

{

  udf_Uint32_t  len;

  udf_Uint32_t  recorded_len;

  udf_Uint32_t  information_len;

  udf_lb_addr_t ext_loc;

} GNUC_PACKED;

typedef struct udf_ext_ad_s udf_ext_ad_t;

/** Descriptor Tag (ECMA 167r3 4/7.2 - See 3/7.2) */

/** Tag Identifier (ECMA 167r3 4/7.2.1) */

/** File Set Descriptor (ECMA 167r3 4/14.1) */

struct udf_fsd_s

{

  udf_tag_t       tag;

  udf_timestamp_t recording_time;

  udf_Uint16_t    interchange_lvl;

  udf_Uint16_t    maxInterchange_lvl;

  udf_Uint32_t    charset_list;

  udf_Uint32_t    max_charset_list;

  udf_Uint32_t    fileset_num;

  udf_Uint32_t    udf_fsd_num;

  udf_charspec_t  logical_vol_id_charset;

  udf_dstring     logical_vol_id[128];

  udf_charspec_t  fileset_charset;

  udf_dstring     fileSet_id[32];

  udf_dstring     copyright_file_id[32];

  udf_dstring     abstract_file_id[32];

  udf_long_ad_t   root_icb;

  udf_regid_t     domain_id;

  udf_long_ad_t   next_ext;

  udf_long_ad_t   stream_directory_ICB;

  udf_Uint8_t     reserved[32];

} GNUC_PACKED;

typedef struct udf_fsd_s udf_fsd_t;

/** Partition Header Descriptor (ECMA 167r3 4/14.3) */

struct partition_header_desc_s

{

  udf_short_ad_t unalloc_space_table;

  udf_short_ad_t unalloc_space_bitmap;

  udf_short_ad_t partition_integrity_table;

  udf_short_ad_t freed_space_table;

  udf_short_ad_t freed_space_bitmap;

  udf_Uint8_t    reserved[88];

} GNUC_PACKED;

typedef struct partition_header_desc_s partition_header_desc_t;

/** File Identifier Descriptor (ECMA 167r3 4/14.4) */

struct udf_fileid_desc_s

{

  udf_tag_t     tag;

  udf_Uint16_t  file_version_num;

  udf_Uint8_t   file_characteristics;

  udf_Uint8_t   i_file_id;

  udf_long_ad_t icb;

  /* MSVC workaround for multiple zero sized arrays

     Unlike what is the case with GNU, and against logic, an union of zero

     sized arrays in the Microsoft world is not zero bytes but one byte!

     Thus, for sizeof() to be consistent across platforms, we must use an

     ugly workaround that attaches the union to the last non-zero member. */

  union {

    udf_Uint16_t        i_imp_use;

    struct {

      udf_Uint16_t      unused;

      udf_Uint8_t       data[0];

    } imp_use;

    struct {

      udf_Uint16_t      unused;

      udf_Uint8_t       data[0];

    } file_id;

    struct {

      udf_Uint16_t      unused;

      udf_Uint8_t       data[0];

    } padding;

  } u;

} GNUC_PACKED;

typedef struct udf_fileid_desc_s udf_fileid_desc_t;

/** File Characteristics (ECMA 167r3 4/14.4.3) 

    Imagine the below enumeration values are \#defines to be used in a

    bitmask rather than distinct values of an enum.

*/

typedef enum {

  UDF_FILE_HIDDEN       = (1 << 0),

  UDF_FILE_DIRECTORY    = (1 << 1),

  UDF_FILE_DELETED      = (1 << 2),

  UDF_FILE_PARENT       = (1 << 3),

  UDF_FILE_METADATA     = (1 << 4)

} file_characteristics_t;

/** Allocation Ext Descriptor (ECMA 167r3 4/14.5) */

struct allocExtDesc

{

  udf_tag_t    tag;

  udf_Uint32_t previous_alloc_ext_loc;

  udf_Uint32_t i_alloc_descs;

} GNUC_PACKED;

/** ICB Tag (ECMA 167r3 4/14.6) */

struct udf_icbtag_s

{

  udf_Uint32_t  prev_num_dirs;

  udf_Uint16_t  strat_type;

  udf_Uint16_t  strat_param;

  udf_Uint16_t  max_num_entries;

  udf_Uint8_t   reserved;

  udf_Uint8_t   file_type;

  udf_lb_addr_t parent_ICB;

  udf_Uint16_t  flags;

} GNUC_PACKED;

typedef struct udf_icbtag_s udf_icbtag_t;

#define UDF_ICB_TAG_FLAGS_SETUID        0x40

#define UDF_ICB_TAG_FLAGS_SETGID        0x80

#define UDF_ICB_TAG_FLAGS_STICKY        0x100

/** Strategy Type (ECMA 167r3 4/14.6.2) which helpfully points

    largely to 4/A.x */

#define ICBTAG_STRATEGY_TYPE_UNDEF 0x0000 

#define ICBTAG_STRATEGY_TYPE_1     0x0001 /**< 4/A.2 Direct entries Uint16 */

#define ICBTAG_STRATEGY_TYPE_2     0x0002 /**< 4/A.3 List of ICB direct entries */

#define ICBTAG_STRATEGY_TYPE_3     0x0003 /**< 4/A.4 */

#define ICBTAG_STRATEGY_TYPE_4     0x0004 /**< 4/A.5 Hierarchy having one

                                           single ICB with one direct entry.

                                           This is what's most often used.

                                          */

/** File Type (ECMA 167r3 4/14.6.6) 

   Imagine the below enum values as \#define'd values rather than

   distinct values of an enum.

*/

typedef enum {

  ICBTAG_FILE_TYPE_UNDEF =      0x00,

  ICBTAG_FILE_TYPE_USE =        0x01,

  ICBTAG_FILE_TYPE_PIE =        0x02,

  ICBTAG_FILE_TYPE_IE =         0x03,

  ICBTAG_FILE_TYPE_DIRECTORY =  0x04,

  ICBTAG_FILE_TYPE_REGULAR =    0x05,

  ICBTAG_FILE_TYPE_BLOCK =      0x06,

  ICBTAG_FILE_TYPE_CHAR =       0x07,

  ICBTAG_FILE_TYPE_EA =         0x08,

  ICBTAG_FILE_TYPE_FIFO =       0x09,

  ICBTAG_FILE_TYPE_SOCKET =     0x0A,

  ICBTAG_FILE_TYPE_TE =         0x0B,

  ICBTAG_FILE_TYPE_SYMLINK =    0x0C,

  ICBTAG_FILE_TYPE_STREAMDIR =  0x0D

} icbtag_file_type_enum_t;

/** Flags (ECMA 167r3 4/14.6.8) */

typedef enum {

  ICBTAG_FLAG_AD_MASK        =  0x0007, /**< "&" this to get below address

                                             flags */

  ICBTAG_FLAG_AD_SHORT       =  0x0000, /**< The allocation descriptor

                                             field is filled with

                                             short_ad's.  If the

                                             offset is beyond the

                                             current extent, look for

                                             the next extent. */

  ICBTAG_FLAG_AD_LONG        =  0x0001, /**< The allocation descriptor

                                             field is filled with

                                             long_ad's If the offset

                                             is beyond the current

                                             extent, look for the next

                                             extent. */

  ICBTAG_FLAG_AD_EXTENDED    =  0x0002,

  ICBTAG_FLAG_AD_IN_ICB      =  0x0003, /**< This type means that the

                                             file *data* is stored in

                                             the allocation descriptor

                                             field of the file entry. */

  ICBTAG_FLAG_SORTED         =  0x0008,

  ICBTAG_FLAG_NONRELOCATABLE =  0x0010,

  ICBTAG_FLAG_ARCHIVE        =  0x0020,

  ICBTAG_FLAG_SETUID         =  0x0040,

  ICBTAG_FLAG_SETGID         =  0x0080,

  ICBTAG_FLAG_STICKY         =  0x0100,

  ICBTAG_FLAG_CONTIGUOUS     =  0x0200,

  ICBTAG_FLAG_SYSTEM         =  0x0400,

  ICBTAG_FLAG_TRANSFORMED    =  0x0800,

  ICBTAG_FLAG_MULTIVERSIONS  =  0x1000,

  ICBTAG_FLAG_STREAM =          0x2000

} icbtag_flag_enum_t;

/** Indirect Entry (ECMA 167r3 4/14.7) */

struct indirect_entry_s

{

  udf_tag_t       tag;

  udf_icbtag_t    icb_tag;

  udf_long_ad_t   indirect_ICB;

} GNUC_PACKED;

/** Terminal Entry (ECMA 167r3 4/14.8) */

struct terminal_entry_s

{

  udf_tag_t       tag;

  udf_icbtag_t    icb_tag;

} GNUC_PACKED;

/** File Entry (ECMA 167r3 4/14.9) */

struct udf_file_entry_s

{

  udf_tag_t       tag;                   

  udf_icbtag_t    icb_tag;                /**< 4/14.9.2 */

  udf_Uint32_t    uid;                    /**< 4/14.9.3 */

  udf_Uint32_t    gid;                    /**< 4/14.9.4 */

  udf_Uint32_t    permissions;            /**< 4/14.9.5 */

  udf_Uint16_t    link_count;             /**< 4/14.9.6 */

  udf_Uint8_t     rec_format;             /**< 4/14.9.7 */ 

  udf_Uint8_t     rec_disp_attr;          /**< 4/14.9.8 */

  udf_Uint32_t    rec_len;                /**< 4/14.9.9 */

  udf_Uint64_t    info_len;               /**< 4/14.9.10 */

  udf_Uint64_t    logblks_recorded;       /**< 4/14.9.11 */

  udf_timestamp_t access_time;            /**< 4/14.9.12 - last access to 

                                           any stream of file prior to 

                                           recording file entry */

  udf_timestamp_t modification_time;      /**< 4/14.9.13 - last access to 

                                             modification to any stream of 

                                             file */

  udf_timestamp_t attribute_time;

  udf_Uint32_t    checkpoint;

  udf_long_ad_t   ext_attr_ICB;

  udf_regid_t     imp_id;

  udf_Uint64_t    unique_ID;

  udf_Uint32_t    i_extended_attr;

  udf_Uint32_t    i_alloc_descs;

  /* The following union allows file entry reuse without worrying

     about overflows, by ensuring the struct is always the

     maximum possible size allowed by the specs: one UDF block. */

  union {

    udf_Uint8_t   ext_attr[0];

    udf_Uint8_t   alloc_descs[0];

    udf_Uint8_t   pad_to_one_block[2048-176];

  } u;

} GNUC_PACKED;

typedef struct udf_file_entry_s udf_file_entry_t;

#define UDF_FENTRY_SIZE 176

#define UDF_FENTRY_PERM_USER_MASK       0x07

#define UDF_FENTRY_PERM_GRP_MASK        0xE0

#define UDF_FENTRY_PERM_OWNER_MASK      0x1C00

/** Permissions (ECMA 167r3 4/14.9.5) */

#define FE_PERM_O_EXEC                  0x00000001U

#define FE_PERM_O_WRITE                 0x00000002U

#define FE_PERM_O_READ                  0x00000004U

#define FE_PERM_O_CHATTR                0x00000008U

#define FE_PERM_O_DELETE                0x00000010U

#define FE_PERM_G_EXEC                  0x00000020U

#define FE_PERM_G_WRITE                 0x00000040U

#define FE_PERM_G_READ                  0x00000080U

#define FE_PERM_G_CHATTR                0x00000100U

#define FE_PERM_G_DELETE                0x00000200U

#define FE_PERM_U_EXEC                  0x00000400U

#define FE_PERM_U_WRITE                 0x00000800U

#define FE_PERM_U_READ                  0x00001000U

#define FE_PERM_U_CHATTR                0x00002000U

#define FE_PERM_U_DELETE                0x00004000U

/** Record Format (ECMA 167r3 4/14.9.7) */

#define FE_RECORD_FMT_UNDEF             0x00

#define FE_RECORD_FMT_FIXED_PAD         0x01

#define FE_RECORD_FMT_FIXED             0x02

#define FE_RECORD_FMT_VARIABLE8         0x03

#define FE_RECORD_FMT_VARIABLE16        0x04

#define FE_RECORD_FMT_VARIABLE16_MSB    0x05

#define FE_RECORD_FMT_VARIABLE32        0x06

#define FE_RECORD_FMT_PRINT             0x07

#define FE_RECORD_FMT_LF                0x08

#define FE_RECORD_FMT_CR                0x09

#define FE_RECORD_FMT_CRLF              0x0A

#define FE_RECORD_FMT_LFCR              0x0B

/** Record Display Attributes (ECMA 167r3 4/14.9.8) */

#define FE_RECORD_DISPLAY_ATTR_UNDEF    0x00

#define FE_RECORD_DISPLAY_ATTR_1        0x01

#define FE_RECORD_DISPLAY_ATTR_2        0x02

#define FE_RECORD_DISPLAY_ATTR_3        0x03

/** Extended Attribute Header Descriptor (ECMA 167r3 4/14.10.1) */

struct extended_attr_header_desc_s

{

  udf_tag_t       tag;

  udf_Uint32_t    imp_attr_location;

  udf_Uint32_t    app_attr_location;

} GNUC_PACKED;

/** Generic Format (ECMA 167r3 4/14.10.2) */

struct generic_format_s

{

  udf_Uint32_t  attr_type;

  udf_Uint8_t   attr_subtype;

  udf_Uint8_t   reserved[3];

  udf_Uint32_t  attrLength;

  udf_Uint8_t   attrData[0];

} GNUC_PACKED;

/** Character Set Information (ECMA 167r3 4/14.10.3) */

struct charSet_info_s

{

  udf_Uint32_t  attr_type;

  udf_Uint8_t   attr_subtype;

  udf_Uint8_t   reserved[3];

  udf_Uint32_t  attrLength;

  udf_Uint32_t  escapeSeqLength;

  udf_Uint8_t   charSetType;

  udf_Uint8_t   escapeSeq[0];

} GNUC_PACKED;

/* Alternate Permissions (ECMA 167r3 4/14.10.4) */

struct alt_perms_s

{

  udf_Uint32_t  attr_type;

  udf_Uint8_t   attr_subtype;

  udf_Uint8_t   reserved[3];

  udf_Uint32_t  attrLength;

  udf_Uint16_t  owner_id;

  udf_Uint16_t  group_id;

  udf_Uint16_t  permission;

} GNUC_PACKED;

/** File Times Extended Attribute (ECMA 167r3 4/14.10.5) */

struct filetimes_ext_attr_s

{

  udf_Uint32_t  attr_type;

  udf_Uint8_t   attr_subtype;

  udf_Uint8_t   reserved[3];

  udf_Uint32_t  attrLength;

  udf_Uint32_t  dataLength;

  udf_Uint32_t  fileTimeExistence;

  udf_Uint8_t   fileTimes;

} GNUC_PACKED;

/** FileTimeExistence (ECMA 167r3 4/14.10.5.6) */

#define FTE_CREATION                    0x00000001

#define FTE_DELETION                    0x00000004

#define FTE_EFFECTIVE                   0x00000008

#define FTE_BACKUP                      0x00000002

/** Information Times Extended Attribute (ECMA 167r3 4/14.10.6) */

struct infoTimesExtAttr

{

  udf_Uint32_t  attr_type;

  udf_Uint8_t   attr_subtype;

  udf_Uint8_t   reserved[3];

  udf_Uint32_t  attrLength;

  udf_Uint32_t  dataLength;

  udf_Uint32_t  infoTimeExistence;

  udf_Uint8_t   infoTimes[0];