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/* This file defines data structures for interpreting bookreader (DEC$BOOK)
* files.
*
* Every data structure except for text_rec has a common header format:
*
* struct { unsigned short type; long length; }
*
* The length includes the header. The primary record types are:
*
* First: Root record for the document, is always first record in file.
* This record contains identifcation information (e.g. author),
* size information (e.g. maxfontid), and pointers to the
* basic components of the documents (.e.g table of contents).
* A crucial item is the record address of the last record,
* which maps part numbers (page numbers) to file records
* (see below).
*
* After the fixed portion of the first record, there is
* list of ssub-records used to describe and locate the
* indices available (contents, index) and optional license
* information.
*
* Bodypart: These records comprise the displayable 'content' of
* the document. These records have a fixed header followed
* by a variable number of sub-records. The fixed portion
* contains sizing info and forward and backward pointers to
* the bodyparts logical chain. A sub-record can contain
* text, a graphic figure, a hotspot definition, or an
* extension definition (e.g. gray area).
*
* Index: This records contains data to allow a user to select a
* section for viewing. It consists of a list of sub-records
* describing the items in the index.
*
* Last: This record contains a table for locating the file records
* comprising a part (a.k.a. page). The part number used is an
* index into the table and each table entry contains the
* RFA of the first record of the part and the size of the part.
* Note that a part may be larger than 32767 so it may have to
* span multiple RMS records. When a part must continue to the
* next record, the last 10 bytes of the record have the RFA and
* (remaining??) part size of the continuation record. The
* continued record has type of continue_middle or continue_end.
*
* secmap: Section Map, contains a table maping the section number
* values in an index record to the part number containing that
* section.
*
* f_desc: ????
*
* font: This part is composed a set of font definition sub-records,
* each definition binds a font number (used in the attributes
* header of a text sub-record) to the adobe font name.
*
* continue_middle:
* continue_end: These records hold continuation segements for parts
* that span multiple RMS records. The data is logically
* concatenated to the previous record starting the RFA pointing
* to this record (i.e. 10 bytes are trimmed from previous record).
*/
/*
* Define symbolic names for records.
*/
#define BKREC_FIRST 1 /* Root record for decw$book file */
#define BKREC_BODYPART 3 /* Document body (text) */
#define BKREC_INDEX 4 /* Index to other pages */
#define BKREC_LAST 5 /* Page id to RFA conversion */
#define BKREC_SECMAP 6
#define BKREC_FDX 7
#define BKREC_FONT 9
#define BKREC_CONT_MID 10 /* Page continuation record. */
#define BKREC_CONT_END 11 /* Final record in segmented page */
#define BKSBREC_TABLE 12
#define BKSBREC_ASCZ_32 13
#define BKSBREC_FONT 14
#define BKSBREC_FDESC 15
#define BKSBREC_IXTXT 16
#define BKSBREC_BODYTEXT 18
#define BKSBREC_FIGURE 19
#define BKSBREC_FIGHOT 20 /* Figure hotspot definition */
#define BKSBREC_EXTENSION 22
#define BKSBREC_LICENSE 24 /* Alternate license */
#ifdef __DECC /* Data structures are unaligned */
#pragma nomember_alignment
#endif
#define BKREC_COMMON_HEADER unsigned short type; long length;
/*
* Define macros to return char pointer to start of variable region of
* record and its size.
*/
#define BKREC_VAR_P(a,typ) &a->reloff[sizeof(a->typ)]
#define BKREC_VAR_S(a,typ) (a->gen.length - sizeof(a->typ))
/*
* Some dataFile contains RMS Record File Addresses (RFA), mimic this structure.
*/
struct file_address { /* RMS Record File Address */
unsigned short wrd[3];
};
struct first_rec {
BKREC_COMMON_HEADER
unsigned short maj_ver, min_ver; /* ODS version number */
char author[24]; /* ascizz */
char product[36];
long partcount; /* number of parts */
long sectioncount; /* number of subparts */
long dircount; /* maybe */
long fontcount; /* Number of fonts? */
long maxfontid;
struct file_address lastptr; /* RFA of last record */
unsigned short lastsize; /* Size of last record */
long docverspage, index_page, index_title, /* page IDs, 0 means absent*/
sym_table, font_page, initial_page, copyright;
unsigned char title_len;
char title[128];
long credate[2];
char id[33];
};
struct text_rec { /* text record. */
unsigned char type, reclen;
unsigned short hor, ver;
unsigned char fontno, x, y;
char data[246]; /* for type three data is
* counted strings separated by
* a flags byte (usually escape */
/*
unsigned char length;
char text[255]; */
};
struct last_rec {
BKREC_COMMON_HEADER
struct { struct file_address rfa; long size; } dir[1];
};
union bkrdr_rec {
struct { /* Generic record format */
BKREC_COMMON_HEADER
} gen; /* Generic header */
char raw[1];
char reloff[1]; /* For computing addresses given offset*/
struct first_rec first; /* type = BKREC_FIRST */
struct {
BKREC_COMMON_HEADER
long partno; /* Part number */
long unk1;
long sectcnt;
long prevpart; /* page id of previous part */
long nextpart; /* Id of next part */
} body; /* type = BKREC_BODYPART */
struct {
BKREC_COMMON_HEADER /* type = BKREC_INDEX, all subrec */
} index;
struct last_rec last; /* type = BKREC_LAST */
struct {
BKREC_COMMON_HEADER
long map[10]; /* Maps section #s to page id */
} secmap; /* type = BKREC_SECMAP */
struct {
BKREC_COMMON_HEADER /* type = BKREC_FDX */
char txt[255];
} fdesc;
struct { /* Font data */
BKREC_COMMON_HEADER /* type = BKREC_FONT */
} font;
struct {
BKREC_COMMON_HEADER
short flags;
long prev, next;
} cont; /* type = BKREC_CONT_* */
/*
* Sub-record types.
*/
struct {
BKREC_COMMON_HEADER
long unknown0; /* total record size */
unsigned char keyid; /* 5=contents, 10=index, 0=other */
long count; /* count of entries */
long part; /* part number */
unsigned char tit_len; /* length of title string */
char title[255];
} table; /* type = BKSBREC_TABLE */
struct { /* Font mapping defintion */
BKREC_COMMON_HEADER
unsigned short fontno; /* internal number */
char name[255]; /* Name asciiz */
} fontdef; /* type = BKSBREC_FONT */
struct {
BKREC_COMMON_HEADER
unsigned short ixhdr[7];
/* struct text_rec ixtxt; */
} ixtxt; /* type = BKSBREC_TABLE */
struct {
BKREC_COMMON_HEADER
long bodhdr[1]; /* bodhr[0] unknown */
long sect_id; /* section id */
long bodhdr2[7];
/* struct text_rec bodtxt;*/ /* varying number */
} bodytext; /* type = BKSBREC_BODY */
struct {
BKREC_COMMON_HEADER
long unk1, unk2;
long sect, pos, verpos, len, sect_id, target;
long unk3;
} hotspot;
struct {
BKREC_COMMON_HEADER
long unk1, unk2, sect, x, y, w, h, unk3, unk4;
} extension; /* extension grayspot on body */
struct {
BKREC_COMMON_HEADER
char name[255]; /* no first page */
} license;
struct {
BKREC_COMMON_HEADER
long unk1, unk2;
long sect, x, y, w, h;
long picbytes;
unsigned char primitive, unk5, unk6, unk7;
unsigned short col, rows; /* col is fontno for txt */
char var_data[1024];
} figure;
};
typedef union bkrdr_rec *bkrdr_recptr;
#ifdef __DECC
#pragma member_alignment
#endif