+/**
+ * @file iso9660.h
+ * @author Lunaixsky (zelong56@gmail.com)
+ * @brief ISO9660 File system header file. (Reference: ECMA-119, 4th ed.)
+ * @version 0.1
+ * @date 2022-10-03
+ *
+ * @copyright Copyright (c) 2022
+ *
+ */
+
+#ifndef __LUNAIX_ISO9660_H
+#define __LUNAIX_ISO9660_H
+
+#include <lunaix/types.h>
+
+// Volume Types
+#define ISO_VOLBOOT 0 // Boot Record
+#define ISO_VOLPRIM 1 // Primary
+#define ISO_VOLSUPP 2 // Supplementary
+#define ISO_VOLPART 3 // Partition
+#define ISO_VOLTERM 255 // Volume descriptor set terminator
+
+#define ISO_FHIDDEN 0x1 // a hidden file
+#define ISO_FDIR 0x2 // a directory file
+#define ISO_FASSOC 0x4 // a associated file
+#define ISO_FRECORD 0x8 // file store in iso record fashion
+#define ISO_FPROTECT 0x10 // file being protected by access control
+#define ISO_FEXTENTS 0x80 // the extent by this record is a file partial
+
+// NOTES:
+// Each Descriptor sized 1 logical block (2048 bytes in common cases)
+// ISO9660 store number in both-byte order. That is, for a d-bits number, it
+// will result in 2d bits of storage. The lower d-bits are little-endian and
+// upper d-bits are big-endian.
+
+struct iso_vol
+{
+ u8_t type;
+ u8_t std_id[5]; // CD001
+ u8_t version;
+} PACKED;
+
+struct iso_vol_boot
+{
+ struct iso_vol header;
+ u8_t sys_id[32];
+ u8_t boot_id[32];
+ u8_t reserved; // align to data line width
+} PACKED;
+
+struct iso_datetime
+{
+ u8_t year[4];
+ u8_t month[2];
+ u8_t day[2];
+ u8_t hour[2];
+ u8_t min[2];
+ u8_t sec[2];
+ u8_t ms[2];
+ u8_t gmt;
+} PACKED;
+
+// (8.4) Describe a primary volume space
+struct iso_vol_primary
+{
+ struct iso_vol header;
+ u8_t reserved_1;
+ u8_t sys_id[32];
+ u8_t vol_id[32];
+ u8_t reserved_2;
+ u32_t sz_lo; // (8.4.8) only lower portion is valid.
+ u32_t sz_hi;
+ u8_t reserved_2;
+ u32_t set_size;
+ u32_t seq_num;
+ u32_t lb_size;
+ u32_t path_tbl_sz_lo; // lower partition - LE.
+ u32_t path_tbl_sz_hi;
+ u32_t lpath_tbl_ptr; // Type L Path table location (LBA)
+ u32_t reserved_3[3]; // use type M if big endian machine.
+ u8_t root_record[34];
+ u8_t set_id[128];
+ u8_t publisher_id[128];
+ u8_t preparer_id[128];
+ u8_t app_id[128];
+ u8_t copyright_id[128];
+ u8_t asbtract_id[128];
+ u8_t bib_id[128];
+ struct iso_datetime ctime; // creation
+ struct iso_datetime mtime; // modification
+ struct iso_datetime ex_time; // expiration
+ struct iso_datetime ef_time; // effective
+ u8_t fstruct_ver; // file structure version, don't care!
+} PACKED; // size 1124
+
+// Layout for Supplementary Vol. is almost identical to primary vol.
+// We ignore it for now. (see section 8.5, table 6)
+
+// (8.6) Describe a volume partition within a volume space
+struct iso_partition
+{
+ struct iso_vol header;
+ u8_t reserved;
+ u8_t sys_id[32];
+ u8_t part_id[32];
+ u32_t part_addr_lo; // (8.6.7) only lower portion is valid.
+ u32_t part_addr_hi;
+ u32_t part_sz_lo; // (8.6.8) only lower portion is valid.
+ u32_t part_sz_hi;
+} PACKED;
+
+// (6.10.4) MDU with variable record
+struct iso_var_mdu
+{
+ u8_t len;
+ u8_t content[0];
+} PACKED;
+
+// (9.1) Directory Record [Embedded into Variable MDU]
+struct iso_drecord
+{
+ u8_t xattr_len;
+ u32_t extent_lo; // location of extent, lower 32 bits is valid.
+ u32_t extent_hi;
+ u32_t data_sz_lo; // size of extent, lower 32 bits is valid.
+ u32_t data_sz_hi;
+ struct
+ {
+ u8_t year;
+ u8_t month;
+ u8_t hour;
+ u8_t min;
+ u8_t sec;
+ u8_t gmt;
+ } PACKED mktime; // Time the record is made, see 9.1.5
+ u8_t flags;
+ u8_t fu_sz; // size of file unit (FU)
+ u8_t gap_sz; // size of gap if FU is interleaved.
+ u32_t vol_seq;
+ struct iso_var_mdu name;
+} PACKED;
+
+// (9.4) Path Table Record. [Embedded into Variable MDU]
+struct iso_precord
+{
+ u8_t xattr_len;
+ u32_t extent_addr;
+ u8_t parent; // indexed into path table
+ u8_t id[0]; // length = iso_var_mdu::len
+} PACKED;
+
+struct iso_xattr
+{
+ u32_t owner;
+ u32_t group;
+ u16_t perm;
+ struct iso_datetime ctime;
+ struct iso_datetime mtime;
+ struct iso_datetime ex_time;
+ struct iso_datetime ef_time;
+ u8_t record_fmt;
+ u8_t record_attr;
+ u8_t record_len;
+ u32_t sys_id;
+ u8_t reserved1[64];
+ u8_t version;
+ u8_t len_esc;
+ u8_t reserved2[64];
+ u32_t payload_sz;
+ u8_t payload[0];
+ // There is also a escape sequence after payload,
+ // It however marked as optional, hence we ignore it.
+} PACKED;
+
+#endif /* __LUNAIX_ISO9660_H */
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