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{
This file is part of the Free Pascal Integrated Development Environment
Copyright (c) 2000 by Berczi Gabor
Help support for (.VPH) help files
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
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.
**********************************************************************}
{$R-}
unit WVPHelp;
interface
uses Objects,
WUtils,WHelp;
const
VPHFileSignature = 'HS';
type
TVPHFileHeader = packed record
SectionCount: byte; { #1 }
TotalTopics : word;
end;
TVPHTopicEntry = packed record
TopicOfs : word;
Dunno : byte;
end;
PVPHTopicTable = ^TVPHTopicTable;
TVPHTopicTable = packed array[0..(MaxBytes div sizeof(TVPHTopicEntry))-1] of TVPHTopicEntry;
PVPHSectionTable = ^TVPHSectionTable;
TVPHSectionTable = packed array[0..4095] of longint;
PVPHHelpFile = ^TVPHHelpFile;
TVPHHelpFile = object(THelpFile)
constructor Init(AFileName: string; AID: word);
destructor Done; virtual;
public
function LoadIndex: boolean; virtual;
function ReadTopic(T: PTopic): boolean; virtual;
private
F: PStream;
Header: TVPHFileHeader;
TopicTable: PVPHTopicTable;
TopicTableSize: longint;
SectionTable: PVPHSectionTable;
SectionTableSize: longint;
TopicBaseOfs: longint;
function ReadHeader: boolean;
function ReadTopicTable: boolean;
function ReadBlock(Data: pointer; DataSize: longint): boolean;
end;
TVPHGetAttrColorProc = function(TextStyle, TextColor: byte; var Color: byte): boolean;
function DefVPHGetAttrColor(TextStyle, TextColor: byte; var Color: byte): boolean;
const VPHGetAttrColor : TVPHGetAttrColorProc = {$ifdef fpc}@{$endif}DefVPHGetAttrColor;
procedure RegisterHelpType;
implementation
function DefVPHGetAttrColor(TextStyle, TextColor: byte; var Color: byte): boolean;
begin
DefVPHGetAttrColor:=false;
end;
constructor TVPHHelpFile.Init(AFileName: string; AID: word);
var OK: boolean;
begin
if inherited Init(AID)=false then Fail;
F:=New(PFastBufStream, Init(AFileName, stOpenRead, HelpStreamBufSize));
OK:=F<>nil;
if OK then OK:=(F^.Status=stOK);
if OK then
begin
OK:=ReadHeader;
if OK then
begin
SectionTableSize:=sizeof(SectionTable^[0])*Header.SectionCount;
GetMem(SectionTable,SectionTableSize);
F^.Read(SectionTable^,SectionTableSize);
OK:=(F^.Status=stOK);
end;
if OK then
OK:=ReadBlock(nil,2);
if OK then
begin
TopicTableSize:=sizeof(TopicTable^[0])*Header.TotalTopics;
GetMem(TopicTable,TopicTableSize);
OK:=ReadTopicTable;
end;
end;
if OK=false then
begin
Done;
Fail;
end;
end;
function TVPHHelpFile.ReadHeader: boolean;
var OK: boolean;
begin
F^.Read(Header,sizeof(Header));
OK:=(F^.Status=stOK);
ReadHeader:=OK;
end;
function TVPHHelpFile.LoadIndex: boolean;
var OK: boolean;
begin
OK:=false;
LoadIndex:=OK;
end;
function TVPHHelpFile.ReadBlock(Data: pointer; DataSize: longint): boolean;
var OK: boolean;
C: char;
begin
F^.Read(C,sizeof(C));
OK:=(F^.Status=stOK) and (C='þ');
if OK then
begin
if Assigned(Data) then
F^.Read(Data^,DataSize)
else
F^.Seek(F^.GetPos+DataSize);
OK:=(F^.Status=stOK);
end;
ReadBlock:=OK;
end;
function TVPHHelpFile.ReadTopicTable: boolean;
var OK: boolean;
begin
OK:=ReadBlock(TopicTable,TopicTableSize);
TopicBaseOfs:=F^.GetPos;
ReadTopicTable:=OK;
end;
function TVPHHelpFile.ReadTopic(T: PTopic): boolean;
var OK: boolean;
begin
OK:=false;
ReadTopic:=OK;
end;
destructor TVPHHelpFile.Done;
begin
if Assigned(TopicTable) and (TopicTableSize>0) then
FreeMem(TopicTable{$ifndef FP},TopicTableSize{$endif});
TopicTable:=nil;
if Assigned(SectionTable) and (SectionTableSize>0) then
FreeMem(SectionTable{$ifndef FP},SectionTableSize{$endif});
SectionTable:=nil;
if Assigned(F) then Dispose(F, Done); F:=nil;
inherited Done;
end;
function CreateProc(const FileName,Param: string;Index : longint): PHelpFile;
begin
CreateProc:=New(PVPHHelpFile, Init(FileName,Index));
end;
procedure RegisterHelpType;
begin
RegisterHelpFileType({$ifdef FPC}@{$endif}CreateProc);
end;
END.
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