1746 lines
58 KiB
C
1746 lines
58 KiB
C
/*** help.c - help library main
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*
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* Copyright <C> 1988-1990, Microsoft Corporation
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*
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* Definitions:
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*
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* Context Map: Mapping of context number to topic number.
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* Allows multiple contexts to be associated with a
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* single topic. Syncronized with the context
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* string table, each entry contains the topic
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* number associated with the corresponding context
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* string.
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*
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* Context String: String on which help can be "looked up".
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*
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* Context String Table: Table of all valid context strings in a
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* particular help file.
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*
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* Local Context: A type of context which bypasses the context
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* string and context numbers. In cross references,
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* encoded as a cross reference string of NULL,
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* followed by a topic number ored with 0x8000.
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*
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* nc: (Context Number) A long which uniquely
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* identifies a help file and context string, or
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* for local contexts, the helpfile and topic
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* number. Formatted as:
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*
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* +----------------+----------------+
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* | Fdb Mem Handle | context number |
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* +----------------+----------------+
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*
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* Where the upper word is the memory handle of the
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* allocated fdb for the help file. The lower word
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* is the either the "true" context number (see
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* below) if <= 0x7fff, or the actual topic number
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* or'ed with 0x8000.
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*
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* Topic: Actual help textual entry. May be compressed.
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*
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* Topic Index: Table of file positions of all topics contained
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* in a help file. Indexed by the topic number,
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* returns that topics physical position in the
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* file.
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*
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* Topic Number: Index to a particular topic. Topic numbers are
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* zero based, and reflect the physical ordering of
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* the topics in the file.
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*
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* "True" context number: is the zero based index or string number in the
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* <context string table>. I.E. the "n'th" string
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* has context number "n".
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*
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* The progression from string to true context number to topic number to file
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* position is:
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*
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* 1) Context String ==> "True" Context Number
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*
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||
* The string is searched for in the <context string table>, and
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* it's number becomes the "true" context number.
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*
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* 2) "True" Context Number ==> Topic Number
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*
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* The context number is an index into the <context map>, returing
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* the topic number associated with the context number.
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*
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* 3) Topic Number ==> File Position
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*
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* The topic number is used as an index into the Topic Index, from
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* which the physical file position is retrieved.
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*
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* Notes:
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* QuickPascal requires NO initialized data. In this case, CLEAR is defined,
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* and the HelpInit routine is included. We also play some pointer games to
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* simple variables, because the C compiler can generate CONST segment
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* entries for the SEG of various vars. (This enables it to load the segment
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* register directly, rather than by using SEG varname and another
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* register). Q/P cannot support this action by the compiler.
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*
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* QuickHelp for OS/2 is reentrant. This code should remain reentrant up to
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* but not including allocating and deallocating fdbs.
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*
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* Revision History:
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*
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* 17-Aug-1990 ln Don't blindly request 64k of an ascii file. Query
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* for size first, then read. Allocations based on
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* previous topic size requests may cause the OS to
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* GPFault for an out of range read.
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* 16-Jul-1990 ln Searching for "filename!" where filename is a QH
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* file, will now fail, rather than GP fault. Searching
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* for "!" will now succeed.
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* 08-Jun-1990 ln Remove HelpLock usage in HelpNcCmp
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* 13-Apr-1990 ln Try to get HelpSzContext to return strings in more
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* cases where it can.
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* 12-Mar-1990 ln Rename CloseFile -> HelpCloseFile
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* 08-Oct-1989 ln Changes to improve the previous change to work (allow
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* decompression) more often in low memory bases.
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* Deallocate table in OpenCore to reduce fragmentation
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* in non-moveable memory systems.
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* 19-May-1989 ln Correct bug in decompressing, where we would not
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* decompress if the tables didn;t exist.
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* 12-Apr-1989 ln Ensure that we handle Locks failing correctly. Also
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* remove TossPortion usage. Unlock handles directly.
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* 10-Mar-1989 ln Change MapTopicToContext to look forward. Changed
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* HelpNc to look begining at passed context string.
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* 17-Jan-1989 ln Correct creation of basename in HelpOpen to account
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* for environment syntax.
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* 09-Dec-1988 ln Add HelpNcUniq
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* 25-Oct-1988 ln Added minascii support to HelpNcPrev. Correct
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* minascii bug in HelpSzContext.
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* 14-Sep-1988 ln Improve doc. Remove ambiguity in MapContextToTopic
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* return value. Improve error checking in various
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* places.
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* 01-Sep-1988 ln Check ReadHelpFile return value in LoadPortion
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* 12-Aug-1988 ln Add check for memory discarded in alloc durring
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* HelpDecomp.
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* 08-Aug-1988 ln Ensure HelpClose closes ALL files. (Off by one error
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* in loop).
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* 14-Apr-1988 ln Modified to conform to QC (CW?) restriction that
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* prohibits any segments from being locked when an
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* allocation is performed.
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* [] 15-Dec-1987 ln Created, for design.
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*
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*************************************************************************/
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#include <assert.h> /* debugging assertions */
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#include <io.h> /* I/O function declarations */
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#include <stdlib.h> /* standard library */
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#include <stdio.h> /* standard I/O definitions */
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#if defined (OS2)
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#define INCL_BASE
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#include <os2.h>
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#else
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#include <windows.h>
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#endif
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#include "help.h" /* global (help & user) decl */
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#include "helpfile.h" /* help file format definition */
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#include "helpsys.h" /* internal (help sys only) decl*/
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#define MASIZE 512 /* size of ma input buffer */
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#define MAOVER 64 /* size of ma search overlap */
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#define ISERROR(x) (((x).mh == 0L) && ((x).cn <= HELPERR_MAX))
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#define SETERROR(x,y) { (x).mh = 0L; (x).cn = y; }
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/*************************************************************************
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**
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** Forward definitions
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*/
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void pascal near CloseShrink(nc, f);
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f pascal near LoadFdb (mh, fdb far *);
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mh pascal near LoadPortion (int, mh);
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ushort pascal near MapContexttoTopic (nc, fdb far *);
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nc pascal near MapTopictoContext(ushort, fdb far *, int);
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nc pascal near NextPrev(nc,int);
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nc pascal near OpenCore(FILE *, ulong, uchar far *, struct helpheader *, fdb far *);
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f pascal near PutFdb (mh, fdb far *);
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f pascal near SizePos (nc, ushort *,ulong *);
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ushort pascal near decomp (uchar far *, uchar far *, uchar far *, uchar far *);
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char far * pascal near hfmemzer(void far *, ushort);
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char far * pascal near hfstrchr(char far *, char);
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char far * pascal near hfstrcpy(char far *, char far *);
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ushort pascal near hfstrlen(char far *);
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f pascal far HelpCmp (uchar far *, uchar far *, ushort, f, f);
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f pascal near HelpCmpSz (uchar far *, uchar far *);
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void pascal near kwPtrBuild(uchar far *, ushort);
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#if ASCII
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long pascal near maLocate (fdb far *, uchar far *, ulong,
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f (pascal far *)(uchar far *, uchar far *, ushort, f, f));
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nc pascal near combineNc (ulong, mh);
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ulong pascal near NctoFo (ulong);
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#endif
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/*************************************************************************
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**
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** External Global data
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** BEWARE. The effects of global data on reentrancy should be VERY carefully
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** considered.
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**
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*************************************************************************/
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extern mh tbmhFdb[MAXFILES+1];
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extern char szNil[1];
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extern ushort cBack;
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#ifdef CLEAR
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/*************************************************************************
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**
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** HelpInit - One-time initialization
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**
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** Purpose:
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** Performs one-time initialization. Right now that's a zero fill of static
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** memory for those environments which don't support pre-inited static
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** memory.
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**
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** Entry:
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** none
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**
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** Exit:
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** none
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**
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*/
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void far pascal LOADDS HelpInit () {
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hfmemzer (tbmhFdb, sizeof(tbmhFdb)); /* zero entire fdb handle table */
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hfmemzer (szNil, sizeof(szNil)); /* zero null string */
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hfmemzer (&cBack, sizeof(cBack)); /* zero back trace count */
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/* end HelpInit */}
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#endif
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/*************************************************************************
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**
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** HelpOpen - Open help file & return help handle.
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**
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** Purpose:
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** Given the file basename, locate the associated help file on the path, and
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** open it, initializing internal data structures as appropriate.
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**
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** Entry:
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** fpszName - base filename to be openned.
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**
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** Exit:
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** nc initial context for openned file.
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**
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** Exceptions:
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** Returns error code on failure to open for any reason.
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**
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*/
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nc far pascal LOADDS HelpOpen (
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char far *fpszName
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) {
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FILE *fhT; /* temp file handle */
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fdb fdbLocal; /* local copy of fdb to use */
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uchar far *fpszBase; /* base filename */
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void far *fpT;
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struct helpheader hdrLocal; /* for use by opencore */
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nc ncRet = {0,0}; /* first context */
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mh *ptbmhFdb; /* pointer into mh table */
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/*
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** create basename by removing possible env variable, drive, and scanning
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** for last path seperator
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*/
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fpszBase = fpszName;
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if (fpT = hfstrchr(fpszBase,':'))
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fpszBase = (uchar far *)fpT+1;
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while (fpT = hfstrchr(fpszBase,'\\'))
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fpszBase = (uchar far *)fpT+1;
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/*
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** Scan FDB's for an open file of the same base name. If we encounter the name,
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** in either the true filename, or file header, just return that file's initial
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** context. Otherwise fall below to try and open it.
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*/
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for (ptbmhFdb=&tbmhFdb[1]; ptbmhFdb<=&tbmhFdb[MAXFILES]; ptbmhFdb++) {
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if (LoadFdb (*ptbmhFdb,&fdbLocal)) {
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if (HelpCmpSz(fpszBase,fdbLocal.fname) ||
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HelpCmpSz(fpszBase,fdbLocal.hdr.fname))
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ncRet = fdbLocal.ncInit;
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if (ncRet.mh && ncRet.cn)
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return ncRet;
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}
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}
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/*
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** Open file. If we can, then call the core open routine to open the file (and
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** any anything appended to it).
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**
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** Warning: the app may callback HelpClose at this point.
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*/
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if (fhT = OpenFileOnPath(fpszName,FALSE)) {
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ncRet = OpenCore (fhT,0L,fpszBase,&hdrLocal,&fdbLocal);
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if (ISERROR(ncRet))
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HelpCloseFile (fhT);
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return ncRet;
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}
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SETERROR(ncRet, HELPERR_FNF);
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return ncRet;
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// rjsa return HELPERR_FNF;
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/* end HelpOpen*/}
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/*************************************************************************
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||
**
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||
** OpenCore - Recursive core of HelpOpen
|
||
**
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||
** Purpose:
|
||
** Given the open file handle, initialize internal data structures as
|
||
** appropriate. Attempt to open any file that is appended.
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||
**
|
||
** Entry:
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** fhT - Open file handle
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||
** offset - Offset from start of file of help file to open
|
||
** fpszBase - pointer to base filename
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||
**
|
||
** Exit:
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** initial context, or NULL on failure.
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||
**
|
||
** Exceptions:
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||
** Returns NULL on failure to open for any reason.
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||
**
|
||
*/
|
||
nc pascal near OpenCore (
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||
FILE * fhHelp,
|
||
ulong offset,
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||
uchar far *fpszBase, /* base filename */
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||
struct helpheader *phdrLocal,
|
||
fdb far *pfdbLocal /* pointer to current FDB */
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||
) {
|
||
//void far *fpT;
|
||
int ihFree; /* handle for free fdb (& index)*/
|
||
mh mhCur; /* current memory handle */
|
||
nc ncFirst = {0,0}; /* first context */
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||
nc ncInit; /* first context */
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||
mh *pmhT; /* pointer into mh table */
|
||
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||
/*
|
||
** Read in helpfile header
|
||
*/
|
||
if (ReadHelpFile(fhHelp,
|
||
offset,
|
||
(char far *)phdrLocal,
|
||
(ushort)sizeof(struct helpheader))) {
|
||
/*
|
||
** search for available fdb
|
||
*/
|
||
for (ihFree = MAXFILES, pmhT = &tbmhFdb[MAXFILES];
|
||
ihFree && *pmhT;
|
||
ihFree--, pmhT--);
|
||
/*
|
||
** if an offset is present, and this is NOT a compressed file, or there is no
|
||
** available fdb, ignore the operation.
|
||
*/
|
||
if ( offset
|
||
&& (phdrLocal->wMagic != wMagicHELP)
|
||
&& (phdrLocal->wMagic != wMagicHELPOld)
|
||
) {
|
||
SETERROR(ncInit, HELPERR_BADAPPEND);
|
||
return ncInit;
|
||
// rjsa return HELPERR_BADAPPEND;
|
||
}
|
||
if (ihFree == 0) {
|
||
SETERROR(ncInit, HELPERR_LIMIT);
|
||
return ncInit;
|
||
// rjsa return HELPERR_LIMIT;
|
||
}
|
||
/*
|
||
** allocate fdb. Again, if we can't, skip it all and return NULL.
|
||
*/
|
||
if (mhCur = *pmhT = HelpAlloc((ushort)sizeof(fdb))) {
|
||
/*
|
||
** Fill in helpfile header & appropriate fdb fields
|
||
*/
|
||
hfmemzer(pfdbLocal,sizeof(fdb)); /* zero entire fdb */
|
||
pfdbLocal->fhHelp = fhHelp; /* file handle */
|
||
ncFirst.mh = pfdbLocal->ncInit.mh = mhCur;
|
||
ncFirst.cn = pfdbLocal->ncInit.cn = 0L;
|
||
// rjsa ncFirst = pfdbLocal->ncInit = ((long)mhCur) << 16; /* initial context */
|
||
pfdbLocal->foff = offset; /* appended offset */
|
||
hfstrcpy(pfdbLocal->fname,fpszBase); /* include base filename*/
|
||
/*
|
||
** if this is a compressed file (signified by the first two bytes of the header
|
||
** we read in above), then note the file type in the fdb. We unlock the fdb, as
|
||
** MapTopicToContext and the recursion might cause memory allocation. We get a
|
||
** context number for the first topic, and recurse and attempt to open any
|
||
** appended file.
|
||
*/
|
||
if ( (phdrLocal->wMagic == wMagicHELPOld)
|
||
|| (phdrLocal->wMagic == wMagicHELP)
|
||
) {
|
||
if ((phdrLocal->wMagic == wMagicHELP)
|
||
&& (phdrLocal->wVersion > wHelpVers)) {
|
||
SETERROR(ncInit, HELPERR_BADVERS);
|
||
return ncInit;
|
||
// rjsa return HELPERR_BADVERS;
|
||
}
|
||
pfdbLocal->hdr = *phdrLocal;
|
||
pfdbLocal->ftype = FTCOMPRESSED | FTFORMATTED;
|
||
if (PutFdb (mhCur, pfdbLocal)) {
|
||
ncFirst = MapTopictoContext(0,pfdbLocal,0);
|
||
|
||
// We free the context map (the only thing loaded by the
|
||
// MapTopictoContext) in order to reduce fragmentation in
|
||
// non-moveable memory based systems.
|
||
//
|
||
HelpDealloc (pfdbLocal->rgmhSections[HS_CONTEXTMAP]);
|
||
pfdbLocal->rgmhSections[HS_CONTEXTMAP] = 0;
|
||
|
||
ncInit = OpenCore(fhHelp,pfdbLocal->hdr.tbPos[HS_NEXT]+offset,szNil,phdrLocal,pfdbLocal);
|
||
if (LoadFdb (mhCur, pfdbLocal)) {
|
||
//if (ncInit.cn > HELPERR_MAX) {
|
||
if ( !(ISERROR(ncInit)) ) {
|
||
pfdbLocal->ncLink = ncInit;
|
||
} else {
|
||
pfdbLocal->ncLink.mh = (mh)0;
|
||
pfdbLocal->ncLink.cn = 0L;
|
||
}
|
||
// rjsa pfdbLocal->ncLink = ncInit > HELPERR_MAX ? ncInit : 0;
|
||
pfdbLocal->ncInit = ncFirst;
|
||
}
|
||
}
|
||
}
|
||
#if ASCII
|
||
/*
|
||
** In the case of a minascii formatted file (signified by the first two bytes
|
||
** of the header being ">>") we just set up the filetype and "applications
|
||
** specific character". The default "ncFirst" is the context for the first
|
||
** topic.
|
||
*/
|
||
else if (phdrLocal->wMagic == 0x3e3e) { /* minascii formatted? */
|
||
pfdbLocal->ftype = FTFORMATTED;
|
||
pfdbLocal->hdr.appChar = '>'; /* ignore lines with this*/
|
||
}
|
||
#endif
|
||
else if ((phdrLocal->wMagic & 0x8080) == 0) { /* ascii unformatted? */
|
||
pfdbLocal->ftype = 0;
|
||
pfdbLocal->hdr.appChar = 0xff; /* ignore lines with this*/
|
||
}
|
||
else {
|
||
SETERROR(ncInit, HELPERR_NOTHELP);
|
||
return ncInit;
|
||
// rjsa return HELPERR_NOTHELP;
|
||
}
|
||
|
||
if (!PutFdb (mhCur, pfdbLocal)) {
|
||
ncFirst.mh = (mh)0;
|
||
ncFirst.cn = 0L;
|
||
}
|
||
}
|
||
else {
|
||
SETERROR(ncFirst, HELPERR_MEMORY);
|
||
// rjsa ncFirst = HELPERR_MEMORY; /* error reading file */
|
||
}
|
||
}
|
||
else {
|
||
SETERROR(ncFirst, HELPERR_READ);
|
||
// rjsa ncFirst = HELPERR_READ; /* error reading file */
|
||
}
|
||
|
||
return ncFirst; /* return valid context */
|
||
|
||
/* end OpenCore */}
|
||
|
||
|
||
/*************************************************************************
|
||
**
|
||
** HelpClose - Close Help file
|
||
**
|
||
** Purpose:
|
||
** Close a help file, deallocate all memory associated with it, and free the
|
||
** handle.
|
||
**
|
||
** Entry:
|
||
** ncClose - Context for file to be closed. If zero, close all.
|
||
**
|
||
** Exit:
|
||
** None
|
||
**
|
||
** Exceptions:
|
||
** All errors are ignored.
|
||
**
|
||
*/
|
||
void far pascal LOADDS HelpClose (
|
||
nc ncClose
|
||
) {
|
||
CloseShrink(ncClose,TRUE); /* close file(s) */
|
||
/* end HelpClose */}
|
||
|
||
/*************************************************************************
|
||
**
|
||
** HelpShrink - Release all dynamic memory
|
||
**
|
||
** Purpose:
|
||
** A call to this routines causes the help system to release all dynamic
|
||
** memory it may have in use.
|
||
**
|
||
** Entry:
|
||
** None.
|
||
**
|
||
** Exit:
|
||
** None.
|
||
**
|
||
** Exceptions:
|
||
** None.
|
||
**
|
||
*/
|
||
void far pascal LOADDS HelpShrink(void) {
|
||
nc ncTmp = {0,0};
|
||
CloseShrink(ncTmp,0);
|
||
// rjsa CloseShrink(0,0);
|
||
/* end HelpShrink */}
|
||
|
||
/*************************************************************************
|
||
**
|
||
** CloseShrink - Deallocate memory and possibly Close Help file
|
||
**
|
||
** Purpose:
|
||
** Deallocate all memory associated with a help file, and possibly close free
|
||
** it.
|
||
**
|
||
** Entry:
|
||
** ncClose - Context for file. If zero, do all.
|
||
** fClose - TRUE if a close operation.
|
||
**
|
||
** Exit:
|
||
** None
|
||
**
|
||
** Exceptions:
|
||
** All errors are ignored.
|
||
**
|
||
*/
|
||
void pascal near CloseShrink (
|
||
nc ncClose,
|
||
f fClose
|
||
) {
|
||
fdb fdbLocal; /* pointer to current FDB */
|
||
int i;
|
||
mh mhClose; /* fdb mem hdl to file to close */
|
||
mh *pmhFdb; /* pointer to FDB's table entry */
|
||
|
||
|
||
mhClose = ncClose.mh; /* get index */
|
||
// rjsa mhClose = (mh)HIGH(ncClose); /* get index */
|
||
for (pmhFdb = &tbmhFdb[0]; /* for each possible entry */
|
||
pmhFdb <= &tbmhFdb[MAXFILES];
|
||
pmhFdb++
|
||
) {
|
||
if ((mhClose == 0) /* if all selected */
|
||
|| (mhClose == *pmhFdb)) { /* or this one selected */
|
||
|
||
if (LoadFdb (*pmhFdb, &fdbLocal)) { /* if open file */
|
||
/*
|
||
* Recurse to close/shrink any appended files
|
||
*/
|
||
if ((fdbLocal.ncLink.mh || fdbLocal.ncLink.cn) && mhClose)
|
||
CloseShrink (fdbLocal.ncLink, fClose);
|
||
|
||
for (i=HS_count-2; i>=0; i--) /* for dyn mem handles */
|
||
HelpDealloc(fdbLocal.rgmhSections[i]); /* dealloc */
|
||
hfmemzer(fdbLocal.rgmhSections,sizeof(fdbLocal.rgmhSections));
|
||
|
||
if (fClose) {
|
||
HelpCloseFile(fdbLocal.fhHelp); /* close file */
|
||
HelpDealloc(*pmhFdb); /* deallocate fdb */
|
||
*pmhFdb = 0;
|
||
}
|
||
else
|
||
PutFdb (*pmhFdb, &fdbLocal); /* update FDB */
|
||
}
|
||
}
|
||
}
|
||
/* end CloseShrink */}
|
||
|
||
/*** HelpNcCmp - Look up context string, provide comparison routine
|
||
*
|
||
* Given an ascii string, determine the context number of that string. Uses
|
||
* user-supplied comparison routine.
|
||
*
|
||
* Entry:
|
||
* lpszContext - Pointer to asciiz context string.
|
||
* ncInital - Starting Context, used to locate file.
|
||
* lpfnCmp - far pointer to comparison routine to use.
|
||
*
|
||
* Exit:
|
||
* Context number, if found.
|
||
*
|
||
* Exceptions:
|
||
* Returns NULL if context string not found.
|
||
*
|
||
*************************************************************************/
|
||
nc far pascal LOADDS HelpNcCmp (
|
||
char far *fpszContext,
|
||
nc ncInitial,
|
||
f (pascal far *lpfnCmp)(uchar far *, uchar far *, ushort, f, f)
|
||
) {
|
||
f fFound = FALSE; // TRUE -> found
|
||
f fOpened = FALSE; // TRUE -> file was openned here
|
||
fdb fdbLocal; // pointer to current FDB
|
||
char far *fpszT; // temp far pointer
|
||
long i;
|
||
long iStart; // nc to start looking at
|
||
mh mhCur; // memory handle locked
|
||
nc ncRet = {0,0}; // The return value
|
||
char far *fpszContexts; // pointer to context strings
|
||
|
||
|
||
// if the context string includes a "filename!", then open that as a help
|
||
// file, and point to the context string which may follow.
|
||
//
|
||
if ((fpszT = hfstrchr(fpszContext,'!')) && (fpszT != fpszContext)) {
|
||
*fpszT = 0;
|
||
ncInitial = HelpOpen(fpszContext);
|
||
*fpszT++ = '!';
|
||
fpszContext = fpszT;
|
||
fOpened = TRUE;
|
||
}
|
||
|
||
// if helpfile was not openned, just return the error
|
||
//
|
||
if (ISERROR(ncInitial)) {
|
||
ncInitial.mh = (mh)0;
|
||
ncInitial.cn = 0L;
|
||
return ncInitial;
|
||
}
|
||
|
||
// For compressed files we scan the context strings in the file
|
||
// (this turns out not to be that speed critical in
|
||
// comparision with decompression, so I haven't bothered), to get the
|
||
// context number.
|
||
//
|
||
// If not found, and there IS a linked (appended) file, we recurse to search
|
||
// that file as well.
|
||
//
|
||
// The context number for compressed files is just the zero based string
|
||
// number, plus the number of predefined contexts, with the fdb memory
|
||
// handle in the upper word.
|
||
//
|
||
if (LoadFdb (ncInitial.mh, &fdbLocal)) {
|
||
if (fdbLocal.ftype & FTCOMPRESSED) {
|
||
|
||
// If not a local context look up, get the context strings, and
|
||
// search
|
||
//
|
||
if (*fpszContext) {
|
||
mhCur = LoadPortion (HS_CONTEXTSTRINGS, ncInitial.mh);
|
||
if ( (mhCur == (mh)0)
|
||
|| (mhCur == (mh)(-1))
|
||
|| (!(fpszContexts = HelpLock(mhCur)))
|
||
) {
|
||
ncRet.mh = (mh)0;
|
||
ncRet.cn = 0L;
|
||
return ncRet;
|
||
}
|
||
i=0;
|
||
|
||
// iStart allows us to begin searching from the context string
|
||
// passed, as opposed to from the begining each time. This
|
||
// allows the application to "carry on" a search from othe last
|
||
// place we found a match. This is usefull for multiple
|
||
// duplicate context resolution, as well as inexact matching.
|
||
//
|
||
iStart = ncInitial.cn;
|
||
if (iStart & 0x8000)
|
||
iStart = 0;
|
||
else
|
||
iStart--; /* table index is 0 based */
|
||
|
||
do {
|
||
if (i >= iStart) {
|
||
fFound = lpfnCmp ( fpszContext
|
||
, fpszContexts
|
||
, 0xffff
|
||
, (f)(fdbLocal.hdr.wFlags & wfCase)
|
||
, (f)FALSE);
|
||
}
|
||
while (*fpszContexts++); /* point to next string */
|
||
i++;
|
||
}
|
||
while ((i < (int)fdbLocal.hdr.cContexts) && !fFound);
|
||
HelpUnlock (mhCur);
|
||
|
||
if (fFound) { /* if a match found */
|
||
ncRet.mh = ncInitial.mh;
|
||
ncRet.cn = i + fdbLocal.hdr.cPreDef;
|
||
// rjsa ncRet = (i+fdbLocal.hdr.cPreDef) /* string # */
|
||
// | HIGHONLY(ncInitial); /* & fdb handle */
|
||
}
|
||
else {
|
||
ncInitial.mh = (mh)0;
|
||
ncInitial.cn = 0L;
|
||
ncRet = HelpNcCmp (fpszContext,fdbLocal.ncLink, lpfnCmp);
|
||
}
|
||
}
|
||
else if (!fOpened) {
|
||
ncRet.mh = ncInitial.mh;
|
||
ncRet.cn = *(UNALIGNED ushort far *)(fpszContext + 1);
|
||
// rjsa ncRet = *(ushort far *)(fpszContext + 1) /* word following*/
|
||
// | HIGHONLY(ncInitial); /* & fdb handle */
|
||
}
|
||
}
|
||
#if ASCII
|
||
/*
|
||
** For minimally formatted ascii files, we sequentially scan the file itself
|
||
** for context string definitions until we find the string we care about.
|
||
**
|
||
** The context number for minascii files is the the byte position/4 of the
|
||
** beginning of the associated topic, with the fdb memory handle in the upper
|
||
** word.
|
||
*/
|
||
else if (fdbLocal.ftype & FTFORMATTED) {
|
||
if (*fpszContext) {
|
||
ncRet.cn = maLocate(&fdbLocal, fpszContext, 0L, lpfnCmp);
|
||
if (ncRet.cn == -1L) {
|
||
ncRet.mh = (mh)0;
|
||
ncRet.cn = 0L;
|
||
} else {
|
||
ncRet = combineNc(ncRet.cn, fdbLocal.ncInit.mh);
|
||
}
|
||
// rjsa ncRet = maLocate(&fdbLocal, fpszContext, 0L, lpfnCmp);
|
||
// ncRet = (ncRet == -1L)
|
||
// ? 0
|
||
// : combineNc(ncRet,HIGH(fdbLocal.ncInit));
|
||
}
|
||
}
|
||
/*
|
||
** for unformatted ascii files, there must have been NO context string to be
|
||
** searched for. In that case, the context number is always 1, plus the fdb
|
||
** mem handle.
|
||
*/
|
||
else if (*fpszContext == 0) { /* if null context string */
|
||
ncRet.mh = ncInitial.mh;
|
||
ncRet.cn = 1L;
|
||
// rjsa ncRet = HIGHONLY(ncInitial) + 1;
|
||
}
|
||
#endif
|
||
}
|
||
|
||
return ncRet;
|
||
|
||
/* end HelpNcCmp */}
|
||
|
||
/*** HelpNc - Look up context string
|
||
*
|
||
* Given an ascii string, determine the context number of that string.
|
||
*
|
||
* Entry:
|
||
* lpszContext - Pointer to asciiz context string.
|
||
* ncInital - Starting Context, used to locate file.
|
||
*
|
||
* Exit:
|
||
* Context number, if found.
|
||
*
|
||
* Exceptions:
|
||
* Returns NULL if context string not found.
|
||
*
|
||
*************************************************************************/
|
||
nc far pascal LOADDS HelpNc (
|
||
char far *fpszContext,
|
||
nc ncInitial
|
||
) {
|
||
return HelpNcCmp (fpszContext, ncInitial, HelpCmp);
|
||
/* end HelpNc */}
|
||
|
||
|
||
/*************************************************************************
|
||
**
|
||
** HelpNcCb - Return count of bytes in compressed topic
|
||
**
|
||
** Purpose:
|
||
** Returns the size in bytes of the compressed topic. Provided for
|
||
** applications to determine how big a buffer to allocate.
|
||
**
|
||
** Entry:
|
||
** ncCur - Context number to return info on.
|
||
**
|
||
** Exit:
|
||
** Count of bytes in the compressed topic
|
||
**
|
||
** Exceptions:
|
||
** Returns 0 on error.
|
||
**
|
||
*/
|
||
ushort far pascal LOADDS HelpNcCb (
|
||
nc ncCur
|
||
) {
|
||
ulong position;
|
||
ushort size;
|
||
|
||
return SizePos(ncCur,&size,&position) ? size+(ushort)4 : (ushort)0;
|
||
|
||
/* end HelpNcCb */}
|
||
|
||
/******************************************************************************
|
||
**
|
||
** HelpLook - Return compressed topic text
|
||
**
|
||
** Purpose:
|
||
** Places the compressed topic text referenced by a passed context number into
|
||
** a user supplied buffer.
|
||
**
|
||
** Entry:
|
||
** ncCur - Context number for which to return text
|
||
** pbDest - Pointer to buffer in which to place the result.
|
||
**
|
||
** Exit:
|
||
** Count of bytes in >uncompressed< topic. This is encoded based on file type.
|
||
**
|
||
** Exceptions:
|
||
** Returns NULL on any error
|
||
**
|
||
*/
|
||
ushort far pascal LOADDS HelpLook (
|
||
nc ncCur,
|
||
PB pbDest
|
||
) {
|
||
fdb fdbLocal; /* pointer to current FDB */
|
||
char far *fpszDest;
|
||
int i;
|
||
ulong position = 0;
|
||
ushort size = 0;
|
||
|
||
if (LoadFdb (ncCur.mh, &fdbLocal)) { /* get fdb down */
|
||
/*
|
||
** for both kinds of formatted files, we determine the position of the topic,
|
||
** and read it in.
|
||
*/
|
||
if (fdbLocal.ftype) {
|
||
if (SizePos (ncCur,&size,&position)) {
|
||
if (fpszDest = (char far *)PBLOCK(pbDest)) {
|
||
|
||
#ifdef BIGDEBUG
|
||
{
|
||
char DbgBuf[128];
|
||
sprintf(DbgBuf, "HELP: Reading Topic for Context %d at %lX, size %d\n", ncCur.cn, position + fdbLocal.foff, size );
|
||
OutputDebugString(DbgBuf);
|
||
}
|
||
#endif
|
||
|
||
size = (ushort)ReadHelpFile(fdbLocal.fhHelp
|
||
,position + fdbLocal.foff
|
||
,fpszDest
|
||
,size);
|
||
|
||
#ifdef BIGDEBUG
|
||
{
|
||
char DbgBuf[128];
|
||
sprintf(DbgBuf, " Read %d bytes to address %lX\n", size, fpszDest );
|
||
OutputDebugString(DbgBuf);
|
||
}
|
||
#endif
|
||
/*
|
||
** for compressed files, if the read was sucessfull, we then return the
|
||
** uncompressed size which is the first word of the topic.
|
||
*/
|
||
#if ASCII
|
||
if (fdbLocal.ftype & FTCOMPRESSED) {
|
||
#endif
|
||
if (size)
|
||
size = *(ushort far *)fpszDest+(ushort)1;
|
||
#if ASCII
|
||
}
|
||
else {
|
||
/*
|
||
** for minascii files, We also set up for the terminating NULL by scanning for
|
||
** the ">>" which begins the next topic, adjusting the size as well.
|
||
*/
|
||
size -= 4;
|
||
for (i=4; i; i--)
|
||
if (fpszDest[++size] == '>') break;
|
||
fpszDest[size++] = 0;
|
||
}
|
||
#endif
|
||
}
|
||
}
|
||
}
|
||
#if ASCII
|
||
else { /* unformatted ascii */
|
||
/*
|
||
** for unformatted ascii, we just read in (first 64k of) the file.
|
||
*/
|
||
if (fpszDest = PBLOCK (pbDest)) {
|
||
if (SizePos (ncCur,&size,&position)) {
|
||
size = (ushort)ReadHelpFile(fdbLocal.fhHelp,0L,fpszDest,size);
|
||
fpszDest[size++] = 0; /* terminate ascii text */
|
||
}
|
||
}
|
||
}
|
||
#endif
|
||
PBUNLOCK (pbDest);
|
||
}
|
||
if (size) size += sizeof(topichdr); /* adjust for prepended topichdr*/
|
||
return size;
|
||
/* end HelpLook */}
|
||
|
||
/******************************************************************************
|
||
**
|
||
** HelpDecomp - Decompress Topic Text
|
||
**
|
||
** Purpose:
|
||
** Fully decompress topic text. Decompresses based on current file, from one
|
||
** buffer to another.
|
||
**
|
||
** Entry:
|
||
** pbTopic - Pointer to compressed topic text
|
||
** pbDest - Pointer to destination buffer
|
||
**
|
||
** Exit:
|
||
** FALSE on successful completion
|
||
**
|
||
** Exceptions:
|
||
** Returns TRUE on any error.
|
||
**
|
||
*/
|
||
f far pascal LOADDS HelpDecomp (
|
||
PB pbTopic,
|
||
PB pbDest,
|
||
nc ncContext
|
||
) {
|
||
fdb fdbLocal; // pointer to current FDB
|
||
uchar far *fpszDest; // pointer to destination
|
||
uchar far *fpTopic; // pointer to locked topic
|
||
f fRv = TRUE; // return Value
|
||
mh mhFdb; // handle to the fdb
|
||
mh mhHuff;
|
||
mh mhKey;
|
||
|
||
mhFdb = ncContext.mh;
|
||
if (LoadFdb (mhFdb, &fdbLocal)) { /* lock fdb down */
|
||
if (fdbLocal.ftype & FTCOMPRESSED) {
|
||
|
||
// This funky sequence of code attempts to ensure that both the
|
||
// huffman and keyword decompression tables are loaded simultaneously
|
||
// since we cannot decompress without both.
|
||
//
|
||
// We do things three times to cover the following cases:
|
||
//
|
||
// 1) huffman loaded ok
|
||
// keyword loaded ok
|
||
// huffman already loaded
|
||
//
|
||
// 2) huffman loaded ok
|
||
// keyword loaded ok after HelpShrink (huffman discarded)
|
||
// huffman re-loaded ok (HelpShrink freed enough for both)
|
||
//
|
||
// 3) huffman loaded ok after HelpShrink
|
||
// keyword loaded ok after HelpShrink (huffman discarded)
|
||
// huffman re-loaded ok (memory fragmentation allowed it)
|
||
//
|
||
// The other cases, where either the load fails immediatly after
|
||
// any HelpShrink call, are the cases we cannot handle.
|
||
//
|
||
// Since handles can change due to the reallocation that can ocurr
|
||
// in the HelpShrink-reload sequence, we simply do the three
|
||
// loads, and then ensure that all the handles match what's in the
|
||
// fdb. If they don't, we fail.
|
||
//
|
||
mhHuff = LoadPortion (HS_HUFFTREE,mhFdb);
|
||
mhKey = LoadPortion (HS_KEYPHRASE,mhFdb);
|
||
mhHuff = LoadPortion (HS_HUFFTREE,mhFdb);
|
||
|
||
if ( LoadFdb (mhFdb, &fdbLocal)
|
||
&& (mhKey == fdbLocal.rgmhSections[HS_KEYPHRASE])
|
||
&& (mhHuff == fdbLocal.rgmhSections[HS_HUFFTREE])) {
|
||
|
||
char far *fpHuff;
|
||
char far *fpKey;
|
||
|
||
// At this point we lock EVERYTHING and ensure that we have
|
||
// valid pointers to it all. (Some swapped memory systems can
|
||
// fail at this point, so we need to be sensitive).
|
||
//
|
||
fpHuff = HelpLock (mhHuff);
|
||
fpKey = HelpLock (mhKey);
|
||
fpTopic = PBLOCK (pbTopic);
|
||
fpszDest = PBLOCK (pbDest);
|
||
|
||
if ( fpTopic
|
||
&& fpszDest
|
||
&& (fpHuff || (mhHuff == 0))
|
||
&& (fpKey || (mhKey == 0))
|
||
) {
|
||
decomp (fpHuff, fpKey, fpTopic, fpszDest+sizeof(topichdr));
|
||
fRv = FALSE;
|
||
}
|
||
}
|
||
|
||
// Unlock the handles, if they were valid.
|
||
//
|
||
if (mhKey != (mh)(-1))
|
||
HelpUnlock (mhKey);
|
||
if (mhHuff != (mh)(-1))
|
||
HelpUnlock (mhHuff);
|
||
}
|
||
else {
|
||
fpszDest = PBLOCK (pbDest);
|
||
#if ASCII
|
||
/*
|
||
** ascii, just copy
|
||
*/
|
||
fpTopic = PBLOCK(pbTopic);
|
||
if (fpTopic && fpszDest) {
|
||
hfstrcpy(fpszDest+sizeof(topichdr),fpTopic);
|
||
#else
|
||
{
|
||
#endif
|
||
fRv = FALSE;
|
||
}
|
||
}
|
||
if (!fRv) {
|
||
((topichdr far *)fpszDest)->ftype = fdbLocal.ftype;
|
||
((topichdr far *)fpszDest)->appChar = (uchar)fdbLocal.hdr.appChar;
|
||
((topichdr far *)fpszDest)->linChar = (uchar)fdbLocal.hdr.appChar;
|
||
((topichdr far *)fpszDest)->lnCur = 1;
|
||
((topichdr far *)fpszDest)->lnOff = sizeof(topichdr);
|
||
}
|
||
PBUNLOCK (pbTopic);
|
||
PBUNLOCK (pbDest);
|
||
}
|
||
return fRv;
|
||
/* end HelpDecomp */}
|
||
|
||
/******************************************************************************
|
||
**
|
||
** HelpNcNext - Return next context number
|
||
**
|
||
** Purpose:
|
||
** Returns the context number corresponding to a physical "next" in the help
|
||
** file.
|
||
**
|
||
** Entry:
|
||
** None
|
||
**
|
||
** Exit:
|
||
** Returns context number
|
||
**
|
||
** Exceptions:
|
||
** Returns NULL on any error
|
||
**
|
||
*/
|
||
nc far pascal LOADDS HelpNcNext (
|
||
nc ncCur
|
||
) {
|
||
return NextPrev(ncCur,1); /* get next */
|
||
/* end HelpNcNext */}
|
||
|
||
/******************************************************************************
|
||
**
|
||
** HelpNcPrev - Return phyiscally previous context
|
||
**
|
||
** Purpose:
|
||
** Returns the context number corresponding to the physically previous topic.
|
||
**
|
||
** Entry:
|
||
** None
|
||
**
|
||
** Exit:
|
||
** Returns context number
|
||
**
|
||
** Exceptions:
|
||
** Returns NULL on any error
|
||
**
|
||
*/
|
||
nc far pascal LOADDS HelpNcPrev (
|
||
nc ncCur
|
||
) {
|
||
return NextPrev(ncCur,-1); /* get previous */
|
||
/* end HelpNcPrev */}
|
||
|
||
/******************************************************************************
|
||
**
|
||
** HelpNcUniq - Return nc guaranteed unique for a given topic
|
||
**
|
||
** Purpose:
|
||
** Maps a context number to a local context number. This is provided such
|
||
** that all context numbers which map to the same topic can be transformed
|
||
** into the same nc which maps to that topic. The information on the
|
||
** context string originally used is lost.
|
||
**
|
||
** Entry:
|
||
** None
|
||
**
|
||
** Exit:
|
||
** Returns context number
|
||
**
|
||
** Exceptions:
|
||
** Returns NULL on any error
|
||
**
|
||
*/
|
||
nc far pascal LOADDS HelpNcUniq (
|
||
nc ncCur
|
||
) {
|
||
fdb fdbLocal; /* pointer to current FDB */
|
||
|
||
if (LoadFdb (ncCur.mh, &fdbLocal))
|
||
if (fdbLocal.ftype & FTCOMPRESSED) {
|
||
nc ncTmp;
|
||
|
||
ncTmp.mh = fdbLocal.ncInit.mh;
|
||
ncTmp.cn = MapContexttoTopic(ncCur, &fdbLocal);
|
||
ncTmp.cn |= 0x8000;
|
||
|
||
ncCur = ncTmp;
|
||
|
||
// rjsa return MapContexttoTopic (ncCur,&fdbLocal)
|
||
// | (fdbLocal.ncInit & 0xffff0000)
|
||
// | 0x8000;
|
||
|
||
}
|
||
return ncCur;
|
||
/* end HelpNcUniq */}
|
||
|
||
/******************************************************************************
|
||
**
|
||
** NextPrev - Return phyiscally next or previous context
|
||
**
|
||
** Purpose:
|
||
** Returns the context number corresponding to the physically next or previous
|
||
** topic.
|
||
**
|
||
** Entry:
|
||
** ncCur = Current Context
|
||
** fNext = 1 for next, -1 for previous.
|
||
**
|
||
** Exit:
|
||
** Returns context number
|
||
**
|
||
** Exceptions:
|
||
** Returns NULL on any error
|
||
**
|
||
*/
|
||
nc pascal near NextPrev (
|
||
nc ncCur,
|
||
int fNext
|
||
) {
|
||
|
||
fdb fdbLocal; /* pointer to current FDB */
|
||
REGISTER nc ncNext = {0,0};
|
||
|
||
if (LoadFdb (ncCur.mh, &fdbLocal)) {
|
||
|
||
//
|
||
// For a compressed file the next/previous physical is computed by taking the
|
||
// context number, mapping it to its corresponding topic number, incrementing
|
||
// or decrementing the topic number (remember, topic numbers are in physical
|
||
// order), and then mapping that back to a context number.
|
||
//
|
||
// When nexting, we also support nexting into any appended file.
|
||
//
|
||
if (fdbLocal.ftype & FTCOMPRESSED) {
|
||
unsigned short cn;
|
||
|
||
cn = (ushort)(((ncCur.cn & 0x8000)
|
||
? ncCur.cn & 0x7ffff
|
||
: MapContexttoTopic(ncCur, &fdbLocal))
|
||
+ (ushort)fNext);
|
||
|
||
ncNext = MapTopictoContext(cn, (fdb far *)&fdbLocal, fNext);
|
||
|
||
// rjsa ncNext = MapTopictoContext((ushort)(((ncCur & 0x8000)
|
||
// ? ncCur & 0x7fff
|
||
// : MapContexttoTopic (ncCur,&fdbLocal))
|
||
// + fNext)
|
||
// ,(fdb far *)&fdbLocal);
|
||
|
||
//
|
||
// if we could not come up with a next, try to find a next using "local"
|
||
// context numbers. Map the context number to a topic number, and if that is
|
||
// not out of range, return it as a context.
|
||
//
|
||
if (!(ncNext.cn)) {
|
||
|
||
// rjsa if ((ncNext = MapContexttoTopic (ncCur,&fdbLocal)) == 0xffff)
|
||
// ncNext = 0;
|
||
ncNext.cn = MapContexttoTopic(ncCur, &fdbLocal);
|
||
|
||
if (ncNext.cn == 0xffff) {
|
||
|
||
ncNext.mh = (mh)0;
|
||
ncNext.cn = 0L;
|
||
|
||
} else {
|
||
|
||
ncNext.cn += fNext;
|
||
|
||
if (ncNext.cn >= fdbLocal.hdr.cTopics) {
|
||
|
||
ncNext.mh = (mh)0;
|
||
ncNext.cn = 0L;
|
||
|
||
} else {
|
||
|
||
// rjsa ncNext |= (fdbLocal.ncInit & 0xffff0000) | 0x8000;
|
||
ncNext.mh = fdbLocal.ncInit.mh;
|
||
ncNext.cn = 0x8000;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (!(ncNext.cn & 0x7fff) && (fNext>0)) {
|
||
ncNext = fdbLocal.ncLink;
|
||
}
|
||
}
|
||
|
||
#if ASCII
|
||
|
||
//
|
||
// minascii files:
|
||
// next'ing: we just sequentially search the file for the first context to
|
||
// come along after that pointed to by our current context number.
|
||
//
|
||
else if (fdbLocal.ftype & FTFORMATTED) {
|
||
|
||
if (fNext > 0) {
|
||
|
||
ncNext.cn = maLocate(&fdbLocal,szNil,NctoFo(ncCur.cn)+4, HelpCmp);
|
||
if (ncNext.cn == -1L) {
|
||
ncNext.mh = (mh)0;
|
||
ncNext.cn = 0L;
|
||
} else {
|
||
ncNext = combineNc(ncNext.cn, ncCur.mh);
|
||
}
|
||
// rjsa ncNext = (ncNext == -1L)
|
||
// ? 0
|
||
// : combineNc(ncNext,HIGH(ncCur));
|
||
|
||
} else {
|
||
|
||
nc ncTemp;
|
||
|
||
//
|
||
// prev'ing: start at the begining of the file, looking for the last context
|
||
// which is less than the current one.
|
||
//
|
||
|
||
ncNext = ncTemp = fdbLocal.ncInit;
|
||
while (NctoFo(ncTemp.cn) < NctoFo(ncCur.cn)) {
|
||
ncNext = ncTemp;
|
||
ncTemp.cn = maLocate(&fdbLocal,szNil,NctoFo(ncTemp.cn)+4, HelpCmp);
|
||
|
||
if (ncTemp.cn == -1L) {
|
||
ncTemp.mh = (mh)0;
|
||
ncTemp.cn = 0L;
|
||
} else {
|
||
ncTemp = combineNc(ncTemp.cn,fdbLocal.ncInit.mh);
|
||
}
|
||
// rjsa ncTemp = (ncTemp == -1L)
|
||
// ? 0
|
||
// : combineNc(ncTemp,HIGH(fdbLocal.ncInit));
|
||
}
|
||
}
|
||
}
|
||
#endif
|
||
}
|
||
return ncNext;
|
||
}
|
||
|
||
/*************************************************************************
|
||
**
|
||
** HelpSzContext - Return string mapping to context number
|
||
**
|
||
** Purpose:
|
||
** Construct a string, which when looked-up, will return the passed context
|
||
** number.
|
||
**
|
||
** Entry:
|
||
** pBuf = place to put the string
|
||
** ncCur = The context number desired
|
||
**
|
||
** Exit:
|
||
** True on sucess.
|
||
**
|
||
*/
|
||
f pascal far LOADDS HelpSzContext (
|
||
uchar far *pBuf,
|
||
nc ncCur
|
||
) {
|
||
f fRet = FALSE; /* return value */
|
||
ulong i;
|
||
fdb fdbLocal; /* pointer to current FDB */
|
||
mh mhCur; /* handle we're dealing with */
|
||
char far *fpszContexts; /* pointer to context strings */
|
||
|
||
*pBuf = 0;
|
||
if (LoadFdb (ncCur.mh, &fdbLocal)) { /* lock fdb down */
|
||
/*
|
||
** Everybody starts with a filename
|
||
*/
|
||
if (*fdbLocal.hdr.fname)
|
||
pBuf = hfstrcpy(pBuf,fdbLocal.hdr.fname);
|
||
else
|
||
pBuf = hfstrcpy(pBuf,fdbLocal.fname);
|
||
*(ushort far *)pBuf = '!'; /* includes null term */
|
||
pBuf++;
|
||
fRet = TRUE;
|
||
|
||
// if we've been given a local context number, see if we can synthesize
|
||
// a context number from which we might get a string. If we can't get
|
||
// one, then return just the filename.
|
||
//
|
||
if ((i = ncCur.cn) & 0x8000) { /* context # */
|
||
ncCur = MapTopictoContext ((ushort)(ncCur.cn & 0x7fff),&fdbLocal,0);
|
||
if ((i = ncCur.cn) & 0x8000) /* context # */
|
||
return fRet;
|
||
}
|
||
/*
|
||
** For compressed files (signified by being able to load context strings) we
|
||
** just walk the context strings looking for string number "ncCur". Once found,
|
||
** the returned string is just the concatenated filename, "!" and context
|
||
** string.
|
||
*/
|
||
mhCur = LoadPortion(HS_CONTEXTSTRINGS, ncCur.mh);
|
||
if (mhCur && (mhCur != (mh)(-1)) && (fpszContexts = HelpLock(mhCur))) {
|
||
if (i && (i <= fdbLocal.hdr.cContexts)) {
|
||
while (--i)
|
||
while (*fpszContexts++);/* point to next string */
|
||
hfstrcpy(pBuf,fpszContexts);/* copy over */
|
||
}
|
||
HelpUnlock (mhCur);
|
||
}
|
||
else if (fdbLocal.ftype & FTCOMPRESSED)
|
||
return FALSE;
|
||
#if ASCII
|
||
/*
|
||
** for min ascii files, we search for the topic, and copy over the context
|
||
** string directly from the file.
|
||
*/
|
||
else if (fdbLocal.ftype & FTFORMATTED) {
|
||
long fpos;
|
||
|
||
if ((fpos = maLocate(&fdbLocal,szNil,NctoFo(ncCur.cn)-1,HelpCmp)) != -1L) {
|
||
fpos = ReadHelpFile(fdbLocal.fhHelp,fpos+2,pBuf,80);
|
||
*(pBuf+fpos) = 0; /* ensure terminated */
|
||
if (pBuf = hfstrchr(pBuf,'\r'))
|
||
*pBuf = 0; /* terminate at CR */
|
||
}
|
||
}
|
||
#endif
|
||
}
|
||
return fRet;
|
||
/* end HelpSzContext */}
|
||
|
||
/******************************************************************************
|
||
**
|
||
** LoadPortion - Load a section of the help file
|
||
**
|
||
** Purpose:
|
||
** If not loaded, allocates memory for and loads a section (as defined in
|
||
** helpfile.h) of the current help file. Once loaded, or if already loaded,
|
||
** locks it, and returns the the memory handle and pointer.
|
||
**
|
||
** This routine must be far, since it is an entry point for HelpMake
|
||
**
|
||
** Entry:
|
||
** hsCur = Help section to be loaded.
|
||
** mhfdb = memory handle for fdb
|
||
**
|
||
** Exit:
|
||
** returns handle for memory
|
||
**
|
||
** Exceptions:
|
||
** returns NULL on portion not existing, 0xffff on inability to allocate memory.
|
||
**
|
||
*/
|
||
mh pascal near LoadPortion (
|
||
int hsCur,
|
||
mh mhfdb
|
||
) {
|
||
fdb fdbLocal;
|
||
char far *fpDest = 0;
|
||
int i;
|
||
mh mhNew = 0; /* pointer to mh destination */
|
||
ushort osize; /* additional prepended size */
|
||
ushort size;
|
||
|
||
if (LoadFdb (mhfdb, &fdbLocal)) {
|
||
if (((mhNew = fdbLocal.rgmhSections[hsCur]) == 0)
|
||
&& fdbLocal.hdr.tbPos[hsCur]) {
|
||
|
||
for (i=hsCur+1; i<HS_count; i++)
|
||
if (fdbLocal.hdr.tbPos[i]) {
|
||
size = (ushort)(fdbLocal.hdr.tbPos[i]-fdbLocal.hdr.tbPos[hsCur]);
|
||
break;
|
||
}
|
||
|
||
osize = (hsCur == HS_KEYPHRASE) ? 1024*sizeof(PVOID) : 0;
|
||
/*
|
||
** Alloc the memory required. Re-read the FDB, incase intervening calls to
|
||
** HelpShrink causes deallocs of other beasties.
|
||
*/
|
||
if ( (mhNew = HelpAlloc((ushort)(size + osize)))
|
||
&& LoadFdb (mhfdb, &fdbLocal)) {
|
||
fdbLocal.rgmhSections[hsCur] = mhNew;
|
||
if (PutFdb (mhfdb, &fdbLocal)) {
|
||
fpDest = (char far *)HelpLock(mhNew);
|
||
if (fpDest && ReadHelpFile(fdbLocal.fhHelp
|
||
,(ulong)fdbLocal.hdr.tbPos[hsCur] + fdbLocal.foff
|
||
,fpDest + osize
|
||
,size)) {
|
||
|
||
if (hsCur == HS_KEYPHRASE)
|
||
kwPtrBuild(fpDest,size);/* build keyword pointers */
|
||
HelpUnlock (mhNew);
|
||
}
|
||
else {
|
||
fdbLocal.rgmhSections[hsCur] = 0;
|
||
HelpDealloc (mhNew);
|
||
PutFdb (mhfdb, &fdbLocal);
|
||
mhNew = (mh)(-1);
|
||
}
|
||
}
|
||
else
|
||
mhNew = (mh)0;
|
||
}
|
||
else
|
||
mhNew = (mh)(-1);
|
||
}
|
||
}
|
||
|
||
return mhNew;
|
||
|
||
/* end LoadPortion */}
|
||
|
||
/*************************************************************************
|
||
**
|
||
** SizePos - Return count of bytes in compressed topic, and position
|
||
**
|
||
** Purpose:
|
||
** Returns the size in bytes of the compressed topic, and it's location in the
|
||
** help file.
|
||
**
|
||
** Entry:
|
||
** ncCur - Context number to return info on.
|
||
** psize - Pointer to place to put the size
|
||
** ppos - Pointer to place to put the position
|
||
**
|
||
** Exit:
|
||
** Returns TRUE on success.
|
||
**
|
||
** Exceptions:
|
||
** Returns FALSE on all errors.
|
||
**
|
||
** Algorithm:
|
||
**
|
||
** If current help handle valid
|
||
** If filetype is compressed
|
||
** If context map not loaded, load it
|
||
** Lock context map
|
||
** Map context to topic number
|
||
** Unlock context map
|
||
** If topic index not loaded, load it
|
||
** Lock topic index
|
||
** size is difference in file positions
|
||
** Unlock topic index
|
||
** else if filetype is formatted ascii
|
||
** seek to context file position
|
||
** scan for next context definition
|
||
** size is difference in file positions
|
||
** else if filetype is unformatted ascii
|
||
** size is filesize
|
||
*/
|
||
f pascal near SizePos (
|
||
nc ncCur,
|
||
ushort *psize,
|
||
ulong *ppos
|
||
) {
|
||
fdb fdbLocal; /* pointer to current FDB */
|
||
char far *fpT; /* temp pointer */
|
||
REGISTER f fRv = FALSE; /* return value */
|
||
ushort iTopic; /* topic index */
|
||
mh mhCur; /* handle being locked */
|
||
|
||
if (LoadFdb (ncCur.mh, &fdbLocal)) { /* get fdb copy */
|
||
if (fdbLocal.ftype & FTCOMPRESSED) {/* if a standard compressed file*/
|
||
if ((iTopic = MapContexttoTopic (ncCur,&fdbLocal)) != 0xffff) {
|
||
mhCur = LoadPortion(HS_INDEX,ncCur.mh);
|
||
if (mhCur && (mhCur != (mh)(-1)) && (fpT = HelpLock(mhCur))) {
|
||
*ppos = ((long far *)fpT)[iTopic];
|
||
*psize = (ushort)(((long far *)fpT)[iTopic+1] - *ppos);
|
||
HelpUnlock (mhCur);
|
||
fRv = TRUE;
|
||
}
|
||
}
|
||
}
|
||
|
||
#if ASCII
|
||
else if (fdbLocal.ftype & FTFORMATTED) {/* if a formatted ascii file*/
|
||
if ((*psize = (ushort)(maLocate(&fdbLocal, szNil, NctoFo(ncCur.cn)+4, HelpCmp)))
|
||
== 0xffff)
|
||
*psize = (ushort)ReadHelpFile(fdbLocal.fhHelp,0L,NULL,0);
|
||
else
|
||
*psize -= (ushort)NctoFo(ncCur.cn);
|
||
*ppos = (ulong) maLocate(&fdbLocal, szNil, NctoFo(ncCur.cn)-1, HelpCmp);
|
||
fRv = TRUE;
|
||
}
|
||
else { /* unformatted ascii */
|
||
*ppos = ReadHelpFile(fdbLocal.fhHelp,0L,NULL,0);
|
||
*psize = (*ppos > (ulong)(65535-sizeof(topichdr)-4))
|
||
? (ushort)(65535-sizeof(topichdr)-4)
|
||
: (ushort)*ppos;
|
||
*ppos = 0L; /* position is always zero. */
|
||
fRv = TRUE;
|
||
}
|
||
#endif
|
||
}
|
||
|
||
return fRv;
|
||
/* end SizePos */}
|
||
|
||
/************************************************************************
|
||
**
|
||
** MapContexttoTopic
|
||
**
|
||
** Purpose:
|
||
** Given a context number, return the topic number which it maps to. This
|
||
** is just a direct index of the context number into the context map.
|
||
**
|
||
** Entry:
|
||
** ncCur = context number to be mapped
|
||
** fpfdbCur = pointer to associated fdb
|
||
**
|
||
** Exit:
|
||
** Returns zero based topic number, or 0xffff on error.
|
||
*/
|
||
ushort pascal near MapContexttoTopic (
|
||
nc ncCur, /* context number to map */
|
||
fdb far *fpfdbCur /* pointer to current FDB */
|
||
) {
|
||
REGISTER ushort topic = 0xffff; /* value to return */
|
||
ushort far *fpT; /* pointer to context map */
|
||
mh mhCur; /* handle being locked */
|
||
|
||
if (ncCur.cn) {
|
||
/*
|
||
** Local contexts: the topic number is already encoded in the low word, if the
|
||
** high bit of that word is set.
|
||
*/
|
||
if (ncCur.cn & 0x8000)
|
||
topic = (ushort)(ncCur.cn & 0x7fff);
|
||
/*
|
||
** Normal Contexts: low word of nc is an index into the context map which
|
||
** returns the topic number
|
||
*/
|
||
else {
|
||
mhCur = LoadPortion(HS_CONTEXTMAP,fpfdbCur->ncInit.mh);
|
||
if (mhCur && (mhCur != (mh)(-1)) && (fpT = HelpLock(mhCur))) {
|
||
topic = fpT[ncCur.cn-1];
|
||
HelpUnlock (mhCur);
|
||
}
|
||
}
|
||
}
|
||
return topic;
|
||
/* end MapContexttoTopic */}
|
||
|
||
/************************************************************************
|
||
**
|
||
** MapTopictoContext
|
||
**
|
||
** Purpose:
|
||
** Given a topic number, return a context which maps to it.
|
||
**
|
||
** This involves searching the context map for the first context entry that
|
||
** maps to the desired topic number.
|
||
**
|
||
** Entry:
|
||
** iTopic = topic number to map back to a context number
|
||
** fpfdbCur = pointer to associated fdb
|
||
**
|
||
** Exit:
|
||
** Returns a valid nc into the file.
|
||
**
|
||
** Exceptions:
|
||
** If the incoming iTopic is invalid, or a read error occurs, then the nc
|
||
** returned refers to the topic number 0.
|
||
**
|
||
*/
|
||
nc pascal near MapTopictoContext(
|
||
ushort iTopic, /* topic number to map */
|
||
fdb far *fpfdbCur, /* pointer to current FDB */
|
||
int Dir
|
||
) {
|
||
ushort cTopics; /* number of topics to search */
|
||
ushort far *fpContextMap; /* pointer to the context map */
|
||
mh mhPortion; /* mem handle for the context map*/
|
||
nc ncMatch = {0,0}; /* return value */
|
||
|
||
mhPortion = LoadPortion (HS_CONTEXTMAP,fpfdbCur->ncInit.mh);
|
||
if (mhPortion && (mhPortion != (mh)(-1))) {
|
||
if (fpContextMap = HelpLock(mhPortion)) {
|
||
if (iTopic >= fpfdbCur->hdr.cTopics) {
|
||
iTopic = 0;
|
||
}
|
||
ncMatch.mh = (mh)0L;
|
||
ncMatch.cn = 0x8000 | iTopic;
|
||
// rjsa ncMatch = 0x8000 | iTopic;
|
||
cTopics = 0;
|
||
while (cTopics < fpfdbCur->hdr.cContexts) {
|
||
if ( Dir == 0 ) {
|
||
if (iTopic == fpContextMap[cTopics++]) {
|
||
ncMatch.cn = cTopics; /* nc's are one based */
|
||
break;
|
||
}
|
||
} else if ( Dir > 0 ) {
|
||
if (iTopic <= fpContextMap[cTopics++]) {
|
||
ncMatch.cn = cTopics; /* nc's are one based */
|
||
break;
|
||
}
|
||
|
||
} else if ( Dir < 0 ) {
|
||
|
||
if (iTopic == fpContextMap[cTopics++]) {
|
||
ncMatch.cn = cTopics;
|
||
break;
|
||
} else if (iTopic < fpContextMap[cTopics-1]) {
|
||
ncMatch.cn = cTopics-1;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
//if ( iTopic != fpContextMap[cTopics-1] ) {
|
||
// ncMatch.cn = 0;
|
||
//}
|
||
if ( cTopics >= fpfdbCur->hdr.cContexts) {
|
||
ncMatch.cn = 0;
|
||
}
|
||
HelpUnlock (mhPortion);
|
||
}
|
||
}
|
||
ncMatch.mh = (fpfdbCur->ncInit).mh;
|
||
return ncMatch;
|
||
// rjsa return ncMatch | HIGHONLY(fpfdbCur->ncInit);
|
||
}
|
||
|
||
/************************************************************************
|
||
**
|
||
** LoadFdb - make local copy of fdb.
|
||
**
|
||
** Purpose:
|
||
** Used to create a local copy of an FDB, so that we don't have to keep a
|
||
** locked, far copy around.
|
||
**
|
||
** Entry:
|
||
** mhFdb - memory handle for the FDB
|
||
** fpFdbDest - Pointer to destination for FDB copy
|
||
**
|
||
** Exit:
|
||
** returns TRUE if FDB copied.
|
||
*/
|
||
f pascal near LoadFdb (
|
||
mh mhfdb,
|
||
fdb far *fpfdbDest
|
||
) {
|
||
fdb far *fpfdbCur; /* pointer to current FDB */
|
||
|
||
if (fpfdbCur = HelpLock (mhfdb)) {
|
||
*fpfdbDest = *fpfdbCur;
|
||
HelpUnlock (mhfdb);
|
||
return TRUE;
|
||
}
|
||
return FALSE;
|
||
/* end LoadFdb */}
|
||
|
||
/************************************************************************
|
||
**
|
||
** PutFdb - make local copy of fdb permanent.
|
||
**
|
||
** Purpose:
|
||
** Used to copy a local copy of an FDB to the "real" one, so that we don't
|
||
** have to keep a locked, far copy around.
|
||
**
|
||
** Entry:
|
||
** mhFdb - memory handle for the FDB
|
||
** fpfdbSrc - Pointer to source of FDB copy
|
||
**
|
||
** Exit:
|
||
** returns TRUE if FDB copied.
|
||
*/
|
||
f pascal near PutFdb (
|
||
mh mhfdb,
|
||
fdb far *fpfdbSrc
|
||
) {
|
||
fdb far *fpfdbCur; /* pointer to current FDB */
|
||
|
||
if (fpfdbCur = HelpLock (mhfdb)) {
|
||
*fpfdbCur = *fpfdbSrc;
|
||
HelpUnlock (mhfdb);
|
||
return TRUE;
|
||
}
|
||
return FALSE;
|
||
/* end PutFdb */}
|
||
|
||
#if ASCII
|
||
/************************************************************************
|
||
**
|
||
** maLocate - Locate context in minimally formatted ascii file.
|
||
**
|
||
** Purpose:
|
||
** Performs sequential searches on mimimally formatted ascii files to locate
|
||
** lines beginning with ">>" and a context string.
|
||
**
|
||
** Entry:
|
||
** fpfdbCur = Pointer to current fdb
|
||
** fpszSrc = Pointer to context string to be found (or null for next
|
||
** string)
|
||
** offset = offset at which to begin search.
|
||
** lpfnCMp = pointer to comparison routine to use
|
||
**
|
||
** Exit:
|
||
** returns file offset of ">>" of context string.
|
||
**
|
||
** Exceptions:
|
||
** returns -1 on error.
|
||
**
|
||
*/
|
||
long pascal near maLocate (
|
||
fdb far *fpfdbCur,
|
||
uchar far *fpszSrc,
|
||
ulong offset,
|
||
f (pascal far *lpfnCmp)(uchar far *, uchar far *, ushort, f, f)
|
||
) {
|
||
uchar buffer[MASIZE+1]; /* input buffer */
|
||
ushort cbBuf = 0; /* count of bytes in buffer */
|
||
ushort cbSrc; /* length of source string */
|
||
uchar far *pBuf; /* pointer into buffer */
|
||
uchar far *pBufT; /* temp pointer into buffer */
|
||
|
||
cbSrc = hfstrlen(fpszSrc)+1; /* get length of input */
|
||
if (offset == 0xffffffff) /* special case */
|
||
offset = 0;
|
||
while (cbBuf += (ushort)ReadHelpFile(fpfdbCur->fhHelp
|
||
, offset+cbBuf
|
||
, buffer+cbBuf
|
||
, (ushort)(MASIZE-cbBuf))) {
|
||
|
||
buffer[cbBuf] = 0; /* ensure strings terminated */
|
||
pBuf = &buffer[0];
|
||
while (pBuf = hfstrchr(pBuf,'>')) { /* look for start of context */
|
||
if ((*(pBuf+1) == '>') /* if >> found */
|
||
&& ((*(pBuf-1) == '\n') /* at beginning of line */
|
||
|| ((offset == 0) /* or beginning of file */
|
||
&& (pBuf == (char far *)&buffer[0])))) {
|
||
pBufT = pBuf +2;
|
||
if (lpfnCmp (fpszSrc, pBufT, cbSrc, FALSE, TRUE))
|
||
return offset + (ulong)(pBuf - (uchar far *)&buffer[0]);
|
||
}
|
||
pBuf += 2;
|
||
}
|
||
if (cbBuf == MASIZE) { /* if buffer full */
|
||
hfstrcpy(buffer,buffer+MASIZE-MAOVER); /* copy down overlap */
|
||
cbBuf = MAOVER; /* and leave that in */
|
||
offset += MASIZE-MAOVER; /* file pos of buffer[0] */
|
||
}
|
||
else {
|
||
offset += cbBuf;
|
||
cbBuf = 0; /* else we're empty */
|
||
}
|
||
}
|
||
return -1;
|
||
|
||
/* end maLocate */}
|
||
#endif
|