Windows Help File(HLP.rfh):
Class: Text, Status: Partial, Last change: 3/7/2008 9:18:22 AM

% WHSTRUCT.H--Windows Help File Internal Records--Pete Davis and Ron Burk,
%  June 1993. See "Undocumented Corner," DDJ, September 1993

type
  DWORD ulong

const
  HELP_MAGIC=0x00035F3F;

type
%PFILEHEADER ^TFILEHEADER near
PWHIFS ^TWHIFSBTREEHEADER near

% Help file Header record
THELPHEADER struc
  DWORD   MagicNumber %      /* 0x00035F3F                */
  PWHIFS WHIFS %            /* File offset of WHIFS header   */
  word WHIFS0
  long    Negative1
  long    FileSize %         /* Size of entire .HLP File  */
ends

data
0000 THELPHEADER Hdr

assert (Hdr.MagicNumber=HELP_MAGIC);

descr ('Windows Help File.',NL,
  'Info Source: WHSTRUCT.H--Windows Help File Internal Records--Pete Davis and Ron Burk,',NL,
  '  June 1993. See "Undocumented Corner," DDJ, September 1993.',NL)

type
% File Header for WHIFS files

TFILEHEADER struc
  long    FilePlusHeader;  /* File size including this header */
  long    FileSize;        /* File size not including header  */
  char    TermNull;
ends

%/* Modified B-Tree Node header to handle a pointer to the page */
TBTreeEntry struc
  PChar name
  ulong Ofs
ends

TBTREENODEHEADER struc
  WORD    Signature %      /* Signature word            */
  int     NEntries %      /* Number of entries         */
  int     PreviousPage %   /* Index of Previous Page    */
  int     NextPage %       /* Index of Next Page        */
%  char    *BTData %        /* Pointer to B-Tree's data  */
  array[@.NEntries] of TBTreeEntry Items
  raw[] rest
ends

%/* Help Directory BTREE */
TMagic18 raw[18]
TGarbage13 raw[13]

TWHIFSPage struc
  case 0 of
  else
    TBTREENODEHEADER
  endc data
ends:[@.data:Size=1024]

TWHIFSBTREEHEADER struc
  TMagic18    Magic %     /* Not exactly magic for some .MVB files   */
  TGarbage13  Garbage
  int     MustBeZero %    /* Probably shows up when Help > ~40 megs  */
  int     NSplits  %      /* Number of page split Btree has suffered */
  int     RootPage %      /* Page # of root page                     */
  int     MustBeNegOne %  /* Probably shows up when B-Tree is HUGE!! */
  int     TotalPages %    /* total # to 2Kb pages in Btree           */
  int     NLevels %       /* Number of levels in this Btree          */
  DWORD   TotalWHIFSEntries
  array [@.TotalPages] of TWHIFSPage Pages
ends

/* Modified B-Tree Index header to handle a pointer to the page */
TBTREEINDEXHEADER struc
    WORD    Signature %      /* Signature word            */
    int     NEntries %      /* Number of entries in node */
//    char    *IdxData
ends

%/* Phrase header for uncompressed |Phrases file */
TPHRASEHDR struc
    int     NumPhrases %   /* Number of phrases in table                    */
    WORD    OneHundred %  /* 0x0100                                        */
ends

%/* Phrase header for compressed |Phrases file */
TALTPHRASEHDR struc
    int     NumPhrases %   /* Number of phrases in table                    */
    WORD    OneHundred %  /* 0x0100                                        */
    long    PhrasesSize %  /* Amount of space uncompressed phrases requires */
ends

%  Flags for |SYSTEM header Flags field below:  Unfortunately, none of these
%  flags are particularly solid. The 0x0004 works MOST of the time. Another
%  flag, 0x0008, appears both in Win32 .HLP files, and in files with Phrase
%  compression but without LZ77 compression.
%#define NO_COMPRESSION_310      0x0000
%#define COMPRESSION_310         0x0004
%#define SYSFLAG_300             0x000A
%/* Header for |SYSTEM file */
TSYSTEMHEADER struc
    BYTE    Magic %     /* 0x6C                  */
    BYTE    Version %   /* Version #             */
    BYTE    Revision %  /* Revision code         */
    BYTE    Always0 %   /* Unknown               */
    WORD    Always1 %   /* Always 0x0001         */
    DWORD   GenDate %  /* Date/Time that the help file was generated    */
    WORD    Flags %    /* Values seen: 0x0000 0x0004, 0x0008, 0x000A    */
ends

%/*Types for SYSTEMREC RecordType below:  note that other record types,
%  such as 0x0A, 0x0B, 0x0C, 0x0D, shown up in the large .MVB files used
%  by the MSDN CD-ROM and Cinemania products. */
%#define HPJ_TITLE       0x0001      /* Title from .HPJ file            */
%#define HPJ_COPYRIGHT   0x0002      /* Copyright notice from .HPJ file */
%#define HPJ_CONTENTS    0x0003      /* Contents=  from .HPJ            */
%#define MACRO_DATA      0x0004      /* RData = 4 nulls if no macros    */
%#define ICON_DATA       0x0005      /* Data for Icon                   */
%#define HPJ_SECWINDOWS  0x0006      /* Secondary window info in .HPJ   */
%#define HPJ_CITATION    0x0008      /* Citation= under [OPTIONS]       */
%/* Secondary Window Record following type 0x0006 System Record */
TWINTYPE array[10] of char
TWINNAME array[9] of char
TWINCAPTN array[51] of char
TRGB array[3] of byte

TSECWINDOW struc
    WORD    Flags %          /* Flags (See Below)        */
    TWINTYPE Type %       /* Type of window           */
    TWINNAME Name %        /* Window name              */
    TWINCAPTN Caption %    /* Caption for window       */
    WORD    X %              /* X coordinate to start at */
    WORD    Y %              /* Y coordinate to start at */
    WORD    Width %          /* Width to create for      */
    WORD    Height %         /* Height to create for     */
    WORD    Maximize %       /* Maximize flag            */
    TRGB    Rgb %         /* RGB for background       */
    BYTE    Unknown1 %       /* No known use             */
    TRGB    RgbNsr %      /* RGB for non scrollable region */
    BYTE    Unknown2 %       /* No known use             */
ends

%/* Values for Secondary Window Flags */
%#define WSYSFLAG_TYPE       0x0001  /* Type is valid        */
%#define WSYSFLAG_NAME       0x0002  /* Name is valid        */
%#define WSYSFLAG_CAPTION    0x0004  /* Ccaption is valid    */
%#define WSYSFLAG_X          0x0008  /* X    is valid        */
%#define WSYSFLAG_Y          0x0010  /* Y    is valid        */
%#define WSYSFLAG_WIDTH      0x0020  /* Width    is valid    */
%#define WSYSFLAG_HEIGHT     0x0040  /* Height   is valid    */
%#define WSYSFLAG_MAXIMIZE   0x0080  /* Maximize is valid    */
%#define WSYSFLAG_RGB        0x0100  /* Rgb  is valid        */
%#define WSYSFLAG_RGBNSR     0x0200  /* RgbNsr   is valid    */
%#define WSYSFLAG_TOP        0x0400  /* On top was set in HPJ file */
%/* Help Compiler 3.1 System record. Multiple records possible */
TSYSTEMREC struc
    WORD    RecordType %   /* Type of Data in record      */
    WORD    DataSize %     /* Size of RData               */
//    char   *RData %        /* Raw data (Icon, title, etc) */
ends

%/* Header for |TOMAP file */
TRsrv15 array[15] of long
TTOMAPHEADER struc
    long    IndexTopic %   /* Index topic for help file */
    TRsrv15    Reserved
    int     ToMapLen %     /* Number of topic pointers  */
//    long    *TopicPtr %    /* Pointer to all the topics */
ends


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