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|
Unit HelpFile;
{$mode objfpc}{$H+}
// NewView - a new OS/2 Help Viewer
// Copyright 2003 Aaron Lawrence (aaronl at consultant dot com)
// This software is released under the Gnu Public License - see readme.txt
Interface
// Encapsulates the basic reading of a help file's structure.
uses
Classes
,SysUtils
,IPFFileFormatUnit
,HelpTopic
// ,HelpBitmap
,SearchTable
,nvNullObjects // Fake various classes like TImageList
;
type
TIndexEntry = class(TObject)
private
name: String;
topic: TTopic;
flags: uint8;
public
constructor Create(aName: String; aTopic: TTopic; aFlags: uint8);
destructor Destroy; override;
property getTopic: TTopic read topic;
function getLabel: String;
function isGlobal: boolean;
function getLevel: integer;
end;
TIndex = class(TObject)
private
entries: TStringList;
public
constructor Create;
destructor Destroy; override;
function Count: longint;
function GetLabels: TStringList;
function GetTopic(aPos: longint): TTopic;
procedure Add(anIndexEntry: TIndexEntry);
end;
THelpFile = class(TObject)
private
function GetStringResourceIDCount: integer;
function GetNumericResourceIDCount: integer;
protected
_Filename : string;
_FileSize : longint;
_Handle: TFileStream;
_pSlotData: pUInt16;
_SlotDataSize: longint;
_Title: string;
_Topics: TList; // of TTopics
_Dictionary: TStringList; // pointers to strings.
_Index: TIndex;
_SearchTable: TSearchTable;
_ReferencedFiles: TStringList;
_FontTable: TList;
_pHeader: TPHelpFileHeader;
_pExtendedHeader: TPExtendedHelpFileHeader;
_pContentsData: pointer;
_pResourceData: pointer;
_pSearchData: pointer;
_pHighlightWords: UInt32ArrayPointer;
_pSlotOffsets: Uint32ArrayPointer;
_pDictionaryData: pointer;
_pFontTableData: pointer;
_pTopicNameData: pointer;
_pTopicGlobalNamesData: pointer;
procedure InitMembers;
procedure Open;
procedure Close;
procedure ReadFileBlock( Var Dest: pointer;
const StartPosition: LongWord;
const Length: LongWord);
procedure ReadHeader;
procedure ReadContents;
procedure ReadDictionary;
procedure ReadSearchTable;
procedure ReadIndex;
procedure ReadReferencedFilesTable;
procedure ReadFontTableData;
procedure ParseFontTable;
function GetTopic( Index: longint ): TTopic;
function GetTopicCount: longint;
function GetDictionaryCount: longint;
function GetDictionaryWord( Index: longint ): string;
function GetHighlightWords: UInt32ArrayPointer;
function GetSearchTable: TSearchTable;
// Lookup global or local panel name list
function FindTopicByName( const Name: string;
Var pData: pointer;
Count: longint;
Offset: longint ): TTopic;
public
constructor Create( const aFileName: string );
destructor Destroy; override;
function GetIndex: TIndex;
property Title: string read _Title;
property Topics[ Index: longint ]: TTopic read GetTopic;
property TopicList: TList read _Topics;
property TopicCount: longint read GetTopicCount;
property StringResourceIDCount: integer read GetStringResourceIDCount;
property NumericResourceIDCount: integer read GetNumericResourceIDCount;
property Index: TIndex read GetIndex;
property Filename: string read _FileName;
property ReferencedFiles: TStringList read _ReferencedFiles;
procedure GetImages( ImageOffsets: TList;
Images: TImageList );
function GetImage( ImageOffset: longint ): THelpBitmap;
property DictionaryCount: longint read GetDictionaryCount;
property DictionaryWords[ Index: longint ]: string read GetDictionaryWord;
function IndexOfTopic( Topic: TTopic ): longint;
property SearchTable: TSearchTable read GetSearchTable;
function FindTopicByResourceID( ID: uint16 ): TTopic;
function FindTopicByLocalName( const Name: string ): TTopic;
function FindTopicByGlobalName( const Name: string ): TTopic;
function FindTopicByTitleStartsWith( const SearchText: string ): TTopic;
function FindTopicByTitleContains( const SearchText: string ): TTopic;
function FindTopicByIndexStartsWith( const SearchText: string ): TTopic;
function FindTopicByIndexContains( const SearchText: string ): TTopic;
procedure FindResourceIDsForTopic( Topic: TTopic;
ResourceIDs: TList );
property HighlightWords: UInt32ArrayPointer read GetHighlightWords;
property FileSize: longint read _FileSize;
procedure SetupFontSubstitutes( Substitutions: string );
public
NotesLoaded: boolean; // used externally
end;
// Returns helpfile that the given topic is within
Function TopicFile( Topic: TTopic ): THelpFile;
function GetHelpFileTitle( const Filename: string ): string;
Implementation
uses
// BseErr,
// StringUtilsUnit,
// CharUtilsUnit,
// DebugUnit,
// ACLFileIOUtility,
// ACLLanguageUnit;
nvUtilities
,ACLStringUtility
;
// Load "missing" bitmap
{ TODO -oGraeme -cbitmap : Create and load a "missing image" image }
{.$R Images}
const
FileErrorNotFound = 'File not found ';
FileErrorAccessDenied = 'File access denied';
FileErrorInUse = 'File in use';
FileErrorInvalidHeader = 'Invalid file header';
// -----------
// TIndexEntry
// -----------
CONSTRUCTOR TIndexEntry.Create(aName: String; aTopic: TTopic; aFlags: uint8);
begin
LogEvent(LogObjConstDest, 'TIndexEntry.Create');
name := aName;
topic := aTopic;
flags := aFlags;
end;
DESTRUCTOR TIndexEntry.Destroy;
begin
LogEvent(LogObjConstDest, 'TIndexEntry.Destroy');
topic := nil;
inherited Destroy;
end;
FUNCTION TIndexEntry.getLabel: String;
begin
result := name;
// index level check (level 1 or 2)
if (getLevel) > 1 then
begin
result := '- ' + result;
end;
if isGlobal then
begin
result := result + ' (g)';
end;
end;
FUNCTION TIndexEntry.isGlobal: boolean;
begin
result := (flags and 64) > 0
end;
FUNCTION TIndexEntry.getLevel: integer;
begin
result := 1;
// index level check (level 1 or 2)
if (flags and 2 ) > 0 then
begin
result := 2;
end;
end;
// -----------
// TIndex
// -----------
CONSTRUCTOR TIndex.Create;
begin
inherited Create;
entries := TStringList.Create;
// labels := nil; // lazy
end;
DESTRUCTOR TIndex.Destroy;
var
i : longint;
tmpEntry : TIndexEntry;
begin
LogEvent(LogObjConstDest, 'TIndex.Destroy (size:' + IntToStr(entries.Count) + ')');
for i := 0 to entries.Count - 1 do
begin
tmpEntry := TIndexEntry(entries.Objects[i]);
if tmpEntry <> nil then
begin
tmpEntry.Free;
entries.Objects[i] := nil;
end;
end;
entries.Free;
inherited Destroy;
end;
FUNCTION TIndex.Count: longint;
begin
result := entries.Count;
end;
FUNCTION TIndex.GetLabels: TStringList;
begin
result := entries;
end;
FUNCTION TIndex.GetTopic(aPos: longint): TTopic;
begin
result := TIndexEntry(entries.Objects[aPos]).getTopic;
end;
PROCEDURE TIndex.add(anIndexEntry: TIndexEntry);
begin
// LogEvent(LogDebug, 'TIndex.add(' + anIndexEntry.getLabel + ', ' + anIndexEntry.ClassName + ')');
entries.AddObject(anIndexEntry.getLabel, anIndexEntry);
end;
//Procedure OnLanguageEvent( Language: TLanguageFile;
// const Apply: boolean );
//var
// tmpPrefix : String;
//begin
// tmpPrefix := 'HelpFile' + LANGUAGE_LABEL_DELIMITER;
//
// Language.LL( Apply, FileErrorNotFound, tmpPrefix + 'FileErrorNotFound', 'File not found' );
// Language.LL( Apply, FileErrorAccessDenied, tmpPrefix + 'FileErrorAccessDenied', 'Access denied' );
// Language.LL( Apply, FileErrorInUse, tmpPrefix + 'FileErrorInUse', 'File in use by another program' );
// Language.LL( Apply,
// FileErrorInvalidHeader,
// tmpPrefix + 'FileErrorInvalidHeader',
// 'File doesn''t appear to be an OS/2 Help document (header ID not correct)' );
// Language.LL( Apply,
// ErrorCorruptHelpFile,
// tmpPrefix + 'ErrorCorruptHelpFile',
// 'File is corrupt' );
//end;
Function TopicFile( Topic: TTopic ): THelpFile;
Begin
Result := Topic.HelpFile as THelpFile;
end;
function THelpFile.GetStringResourceIDCount: integer;
begin
Result := _pHeader^.nname;
end;
function THelpFile.GetNumericResourceIDCount: integer;
begin
Result := _pHeader^.nres;
end;
procedure THelpFile.InitMembers;
begin
_SlotDataSize := 0;
_pHeader := nil;
_pExtendedHeader := nil;
_pContentsData := nil;
_pSlotOffsets := nil;
_pResourceData := nil;
_pSearchData := nil;
_pDictionaryData := nil;
// _pIndexData := nil;
_pFontTableData := nil;
_pHighlightWords := nil;
_Dictionary:= TStringList.Create;
_Topics := TList.Create;
// _Index := TStringList.Create;
_ReferencedFiles := TStringList.Create;
_FontTable := TList.Create;
NotesLoaded := false;
end;
constructor THelpFile.Create(const aFileName: string);
begin
LogEvent(LogObjConstDest, 'THelpFile.Create (file:' + aFileName + ')');
LogEvent(LogParse, 'Helpfile Load: ' + aFileName);
_FileName := aFileName;
InitMembers;
Open;
// we always need these basics:
try
ReadHeader;
ReadContents;
ReadDictionary;
ReadFontTableData;
ParseFontTable;
ReadReferencedFilesTable;
except
Close;
raise;
end;
// the rest is loaded on demand
end;
destructor THelpFile.Destroy;
begin
LogEvent(LogObjConstDest, 'THelpFile.Destroy');
Dispose( _pHeader );
Dispose( _pExtendedHeader );
FreeMem( _pContentsData );
FreeMem( _pSlotOffsets );
FreeMem( _pResourceData );
FreeMem( _pSearchData );
FreeMem( _pDictionaryData );
// DeallocateMemory( _pIndexData );
FreeMem( _pFontTableData );
FreeMem( _pHighlightWords );
// index entries are pointing to topics
// so let us clean them first
if Assigned( _Index ) then
_Index.Free;
if Assigned( _Topics ) then
DestroyListAndObjects( _Topics );
_Dictionary.Free;
_SearchTable.Free;
_ReferencedFiles.Free;
_FontTable.Free;
_Handle.Free;
end;
procedure THelpFile.Open;
begin
LogEvent(LogDebug, 'Open File >>');
if not FileExists( _Filename ) then
raise EHelpFileException.Create( FileErrorNotFound );
try
_Handle := TFileStream.Create(_FileName, fmOpenRead or fmShareDenyWrite);
except
on E: Exception do
raise EHelpFileException.Create(E.Message);
end;
//case rc of
// ERROR_FILE_NOT_FOUND: // crap, this doesn't actually occur!
// raise EHelpFileException.Create( FileErrorNotFound );
//
// ERROR_ACCESS_DENIED:
// raise EHelpFileException.Create( FileErrorAccessDenied );
//
// ERROR_SHARING_VIOLATION:
// raise EHelpFileException.Create( FileErrorInUse );
//
// else
// raise EHelpFileException.Create( SysErrorMessage( rc ) );
//end;
_FileSize := GetFileSize(_Filename);
LogEvent(LogDebug, 'Open File <<');
end;
procedure THelpFile.Close;
begin
_Handle.Free;
_Handle := nil;
end;
procedure THelpFile.ReadFileBlock(var Dest: pointer;
const StartPosition: LongWord; const Length: LongWord);
var
bytes: LongWord;
begin
if Length = 0 then
exit; // nothing to read - go home!
_Handle.Seek(StartPosition, soBeginning);
// we allocate early so this should never happen
if Dest = nil then
Dest := GetMem(Length);
bytes := _Handle.Read(Dest^, Length);
if bytes <> Length then
raise EHelpFileException.Create(ErrorCorruptHelpFile);
end;
procedure THelpFile.ReadHeader;
begin
LogEvent(LogParse, 'Read header');
New(_pHeader);
ReadFileBlock( _pHeader,
0,
sizeof( THelpFileHeader ) );
if _pHeader^.ID <> INF_HEADER_ID then
begin
// not an OS/2 help file.
if (Byte(_pHeader^.ID[0]) = $5f) and (Byte(_pHeader^.ID[1]) = $3f) then
raise EWindowsHelpFormatException.Create( 'It seems we have a Win16 help file!' );
raise EHelpFileException.Create( FileErrorInvalidHeader );
end;
_Title := _pHeader^.Title;
if _pHeader^.extstart > 0 then
begin
New(_pExtendedHeader);
// read extended header
ReadFileBlock( _pExtendedHeader,
_pHeader^.extstart,
sizeof( _pExtendedHeader^ ) );
end;
end;
procedure THelpFile.ReadContents;
var
Topic: TTopic;
EntryIndex: longint;
pEntry: pTTOCEntryStart;
pEnd: pbyte;
tocarray: UInt32ArrayPointer;
pData: Pointer;
p: PByte;
begin
LogEvent(LogParse, 'Read contents');
if _pHeader^.ntoc = 0 then
exit; // explicit check required since ntoc is unsigned
// Presize the topics list to save reallocation time
_Topics.Capacity := _pHeader^.ntoc;
// read toc offsets array
//ReadFileBlock( tocarray,
// _pHeader^.tocoffsetsstart,
// _pHeader^.ntoc * SizeOf(uint32) );
// read slots first so that Topics can refer to it.
ReadFileBlock( _pSlotOffsets,
_pHeader^.slotsstart,
_pHeader^.nslots * sizeof( uint32 ) );
ReadFileBlock( _pContentsData,
_pHeader^.tocstart,
_pHeader^.toclen );
pEntry := _pContentsData;
pEnd := _pContentsData + _pHeader^.toclen;
p := PByte(pEntry);
for EntryIndex := 0 to _pHeader^.ntoc - 1 do
begin
// pEntry := _Handle.Seek(tocarray[EntryIndex], soBeginning);
// pEntry := tocarray[EntryIndex];
if p >= pEnd then
// runs off end of data!
raise EHelpFileException.Create( ErrorCorruptHelpFile );
Topic := TTopic.Create( _Handle,
_pSlotOffsets,
_Dictionary,
pEntry,
_FontTable,
_ReferencedFiles );
Topic.HelpFile := Self;
Topic.Index := EntryIndex;
_Topics.Add( Topic );
p := PByte(pEntry);
inc(p, pEntry^.Length);
pEntry := pTTOCentryStart(p);
end;
end;
procedure THelpFile.ReadDictionary;
var
i: longint;
Len: uint8;
p: pbyte;
pEnd: pbyte;
s: string;
c: array[0..255] of char;
begin
LogEvent(LogParse, 'Read dictionary');
if _pHeader^.ndict = 0 then
exit; // explicit check required since ndict is unsigned
ReadFileBlock( _pDictionaryData,
_pHeader^.dictstart,
_pHeader^.dictlen );
P := _pDictionaryData;
pEnd := _pDictionaryData + _pHeader^.dictlen;
// Presize the dictionary to save reallocation
_Dictionary.Capacity := _pHeader^.ndict;
for i := 0 to _pHeader^.ndict - 1 do
begin
// adjust length so we can use as a Pascal string
// (file uses length including length byte,
// Pascal string have length excluding length byte)
if p >= pEnd then
// ran off end of data
raise EHelpFileException.Create( 'Error reading help file dictionary' );
FillChar(c, sizeof(c), 0); // fill string with NUL chars
Len := p^ - 1; // read string length value (corrected length)
Inc(p, sizeof(byte)); // move pointer
Move(p^, c, Len); // read string of dictionary
s := c; // convert PChar to String type
_Dictionary.Add( s );
Inc(p, Len); // move pointer to next item
end;
end;
function THelpFile.GetIndex: TIndex;
begin
if _Index = nil then
begin
ReadIndex;
end;
Result := _Index;
end;
type
TIndexEntryHeader = packed record
TextLength: uint8;
Flags: uint8;
NumberOfRoots: uint8;
TOCIndex: uint16;
end;
pTIndexEntryHeader = ^TIndexEntryHeader;
procedure THelpFile.ReadIndex;
var
IndexIndex: longint; // I can't resist :-)
pEntryHeader: pTIndexEntryHeader;
EntryText: string;
IndexTitleLen: longint;
p: pByte;
pEnd: pByte;
pIndexData: pointer;
tmpIndexEntry: TIndexEntry;
begin
LogEvent(LogParse, 'Read index');
_Index := TIndex.Create;
if _pHeader^.nindex = 0 then
exit; // explicit check required since ndict is unsigned
pIndexData := nil;
ReadFileBlock( pIndexData,
_pHeader^.indexstart,
_pHeader^.indexlen );
P := pIndexData;
pEnd := pIndexData + _pHeader^.indexlen;
for IndexIndex := 0 to _pHeader^.nindex - 1 do
begin
if p >= pEnd then
// ran off end of data
raise EHelpFileException.Create( 'Error reading help file index' );
pEntryHeader := pTIndexEntryHeader(p);
IndexTitleLen := pEntryHeader^.TextLength;
inc( p, sizeof( TIndexEntryHeader ) );
EntryText := '';
SetString(EntryText, PChar(p), IndexTitleLen);
if pEntryHeader^.TOCIndex < _Topics.Count then
begin
tmpIndexEntry := TIndexEntry.Create(EntryText, TTopic(_Topics[pEntryHeader^.TOCIndex]), pEntryHeader^.flags);
_Index.Add(tmpIndexEntry);
end
else
// raise EHelpFileException.Create( 'Error reading help file index - out of range topic reference' );
; // pass! something special
inc( p, IndexTitleLen
+ pEntryHeader^.NumberOfRoots
* sizeof( uint32 ) ); // skip 'roots' for index search
end;
FreeMem( pIndexData );
end;
function THelpFile.GetSearchTable: TSearchTable;
begin
if _SearchTable = nil then
ReadSearchTable;
Result := _SearchTable;
end;
procedure THelpFile.ReadSearchTable;
var
SearchTableOffset: longint;
SearchTableRecordLengthIs16Bit: boolean;
begin
LogEvent(LogParse, 'Read search table');
if _pHeader^.SearchLen = 0 then
begin
LogEvent(LogParse, 'Read search table (len = 0');
exit;
end;
SearchTableOffset := _pHeader^.SearchStart and $7fffffff;
SearchTableRecordLengthIs16Bit := _pHeader^.SearchStart and $80000000 > 0;
ReadFileBlock( _pSearchData,
SearchTableOffset,
_pHeader^.SearchLen );
_SearchTable := TSearchTable.Create( _pSearchData,
SearchTableRecordLengthIs16Bit,
_Dictionary.Count,
_Topics.Count );
end;
function THelpFile.GetHighlightWords: UInt32ArrayPointer;
begin
if _pHighlightWords = nil then
_pHighlightWords := GetMem( _Dictionary.Count * sizeof( UInt32 ) );
Result := _pHighlightWords;
end;
function THelpFile.FindTopicByResourceID( ID: uint16 ): TTopic;
var
i: longint;
pResourceIDs: UInt16ArrayPointer;
pTopicIndices: UInt16ArrayPointer;
FileResourceID: uint16;
TopicIndex: uint16;
begin
Result := nil;
if _pHeader^.nres = 0 then
// since nres is unsigned
exit;
if _pResourceData = nil then
begin
ReadFileBlock( _pResourceData,
_pHeader^.resstart,
(_pHeader^.nres * sizeof( uint16 )) * 2 ); // list of IDs, list of topics
end;
pResourceIDs := _pResourceData;
pTopicIndices := _pResourceData
+ _pHeader^.nres * sizeof( uint16 );
for i := 0 to _pHeader^.nres - 1 do
begin
FileResourceID := pResourceIDs^[ i ];
if FileResourceID = ID then
begin
// found
TopicIndex := pTopicIndices^[ i ];
Result := TTopic(_Topics[ TopicIndex ]);
exit;
end;
end;
end;
// Look up a local "panel name" and return associated topic, if any.
function THelpFile.FindTopicByLocalName( const Name: string ): TTopic;
begin
Result := FindTopicByName( Name,
_pTopicNameData,
_pHeader^.nname,
_pHeader^.namestart );
end;
function THelpFile.FindTopicByGlobalName( const Name: string ): TTopic;
begin
Result := nil;
if _pExtendedHeader = nil then
// no extended header - no global list to lookup
exit;
Result := FindTopicByName( Name,
_pTopicGlobalNamesData,
_pExtendedHeader ^. EntryInGNameTable,
_pExtendedHeader ^. HelpPanelGNameTblOffset );
end;
// The text of the names are stored in the (global) dictionary
// with a table referencing them.
// We could use a binary search here... but whatever...
function THelpFile.FindTopicByName( const Name: string;
Var pData: pointer;
Count: longint;
Offset: longint ): TTopic;
var
i: longint;
pNameTable: UInt16ArrayPointer;
pTopicIndices: UInt16ArrayPointer;
TopicIndex: uint16;
TopicNameWordIndex: uint16;
TopicName: string;
begin
Result := nil;
if Count = 0 then
// since it's unsigned
exit;
if pData = nil then
ReadFileBlock( pData,
Offset,
Count * sizeof( uint16 ) * 2 ); // list of name words, list of topics
// get pointers to the two parts of the table
pNameTable := pData;
pTopicIndices := pData
+ Count * sizeof( uint16 );
for i := 0 to Count - 1 do
begin
TopicNameWordIndex := pNameTable^[ i ];
TopicName := DictionaryWords[ TopicNameWordIndex ];
if CompareText( TopicName, Name ) = 0 then
begin
// found
TopicIndex := pTopicIndices^[ i ];
Result := TTopic(_Topics[ TopicIndex ]);
exit;
end;
end;
end;
// TODO move to index class
function THelpFile.FindTopicByIndexStartsWith( const SearchText: string ): TTopic;
var
i: longint;
tmpLabel: String;
begin
result := nil;
GetIndex; // make sure it's read
for i := 0 to _Index.Count - 1 do
begin
tmpLabel := _Index.GetLabels[i];
if SameText(tmpLabel, SearchText) then
begin
// found
result := Index.getTopic(i);
exit;
end;
end;
end;
function THelpFile.FindTopicByIndexContains(const SearchText: string): TTopic;
var
i: longint;
tmpLabel: String;
begin
result := nil;
GetIndex; // make sure it's read
for i := 0 to _Index.Count - 1 do
begin
tmpLabel := _Index.GetLabels[i];
if Pos(UpperCase(SearchText), UpperCase(tmpLabel)) > 0 then
begin
// found
result := Index.getTopic(i);
exit;
end;
end;
end;
function THelpFile.FindTopicByTitleStartsWith( const SearchText: string ): TTopic;
var
i: longint;
tmpTopic: TTopic;
tmpLevel : integer;
tmpMore : boolean;
begin
result := nil;
tmpLevel := 0;
repeat
tmpMore := false;
inc(tmpLevel);
for i := 0 to _Topics.Count - 1 do
begin
tmpTopic := TTopic(_Topics[i]);
if tmpLevel = tmpTopic.ContentsLevel then
begin
if StrStartsWithIgnoringCase(tmpTopic.Title, SearchText) then
begin
result := tmpTopic;
exit;
end;
end;
if tmpLevel < tmpTopic.ContentsLevel then
begin
tmpMore := True;
end;
end;
until NOT tmpMore;
end;
function THelpFile.FindTopicByTitleContains( const SearchText: string ): TTopic;
var
i: longint;
tmpTopic: TTopic;
tmpLevel : integer;
tmpMore : boolean;
begin
result := nil;
tmpLevel := 0;
repeat
tmpMore := false;
inc(tmpLevel);
for i := 0 to _Topics.Count - 1 do
begin
tmpTopic := TTopic(_Topics[i]);
if tmpLevel = tmpTopic.ContentsLevel then
begin
if CaseInsensitivePos( SearchText, tmpTopic.Title) > 0 then
begin
result := tmpTopic;
exit;
end;
end;
if tmpLevel < tmpTopic.ContentsLevel then
begin
tmpMore := True;
end;
end;
until NOT tmpMore;
end;
procedure THelpFile.FindResourceIDsForTopic( Topic: TTopic;
ResourceIDs: TList );
var
i: longint;
pResourceIDs: UInt16ArrayPointer;
pTopicIndices: UInt16ArrayPointer;
begin
ResourceIDs.Clear;
if _pHeader^.nres = 0 then
// since nres is unsigned
exit;
if _pResourceData = nil then
ReadFileBlock( _pResourceData,
_pHeader^.resstart,
_pHeader^.nres * sizeof( uint16 ) * 2 ); // list of IDs, list of topics
pResourceIDs := _pResourceData;
pTopicIndices := _pResourceData
+ _pHeader^.nres * sizeof( uint16 );
for i := 0 to _pHeader^.nres - 1 do
begin
if pTopicIndices^[ i ] = Topic.Index then
begin
// found
ResourceIDs.Add( pointer( pResourceIDs^[ i ] ) );
end;
end;
end;
procedure THelpFile.ReadReferencedFilesTable;
var
i: longint;
p: pointer;
pData: pointer;
DatabaseName: string;
pLength: pByte;
begin
if _pExtendedHeader = nil then
// no extended header -> no referenced files table
exit;
if _pExtendedHeader^.Numdatabase = 0 then
exit;
pData := nil; // please allocate...
ReadFileBlock( pData,
_pExtendedHeader^.DatabaseOffset,
_pExtendedHeader^.DatabaseSize );
p := pData;
for i := 0 to _pExtendedHeader^.Numdatabase - 1 do
begin
pLength := p; // length byte, including itself
SetString(DatabaseName, p+1, pLength^-1); // use length value minus the length byte to get the string length
_ReferencedFiles.Add( DatabaseName );
inc( p, pLength^ ); // skip to next entry using full length (including length byte)
end;
FreeMem( pData );
end;
procedure THelpFile.ReadFontTableData;
begin
if _pExtendedHeader = nil then
// no extended header -> no font table
exit;
if _pExtendedHeader^.NumFontEntry = 0 then
exit;
ReadFileBlock( _pFontTableData,
_pExtendedHeader^.FontTableOffset,
_pExtendedHeader^.NumFontEntry * sizeof( THelpFontSpec ) );
end;
procedure THelpFile.ParseFontTable;
var
i: longint;
p: pointer;
pFontSpec: pTHelpFontSpec;
begin
_FontTable.Clear;
p := _pFontTableData;
if p = nil then
exit; // no data
for i := 0 to _pExtendedHeader^.NumFontEntry - 1 do
begin
pFontSpec := p + i * sizeof( THelpFontSpec );
_FontTable.Add( pFontSpec );
end;
end;
procedure THelpFile.GetImages( ImageOffsets: TList;
Images: TImageList );
var
ListIndex: longint;
ImageOffset: longint;
Bitmap: THelpBitmap;
begin
Images.Clear;
for ListIndex := 0 to ImageOffsets.Count - 1 do
begin
ImageOffset := longint( ImageOffsets[ ListIndex ] );
try
Bitmap := THelpBitmap.CreateFromHelpFile( _Handle,
_pHeader^.imgstart
+ ImageOffset );
except
on e: EHelpBitmapException do
{ raise EHelpFileException.Create( 'Error loading help bitmap at'
+ IntToStr( ImageOffset )
+ ': '
+ e.Message );}
begin
Bitmap := THelpBitmap.Create;
Bitmap.LoadFromResourceName( 'MissingBitmap' );
end;
end;
Images.Add( Bitmap, nil );
Bitmap.Destroy;
end;
end;
function THelpFile.GetImage( ImageOffset: longint ): THelpBitmap;
begin
try
Result := THelpBitmap.CreateFromHelpFile( _Handle,
_pHeader^.imgstart
+ ImageOffset );
except
on e: EHelpBitmapException do
{ raise EHelpFileException.Create( 'Error loading help bitmap at'
+ IntToStr( ImageOffset )
+ ': '
+ e.Message );}
begin
result := nil;
end;
end;
end;
function THelpFile.GetTopic( Index: longint ): TTopic;
begin
if ( Index < 0 )
or ( Index > _Topics.Count - 1 ) then
Result := nil
else
Result := TTopic(_Topics[ Index ]);
end;
function THelpFile.GetTopicCount: longint;
begin
Result := _Topics.Count;
end;
function THelpFile.IndexOfTopic( Topic: TTopic ): longint;
begin
Result := _Topics.IndexOf( Topic );
end;
function THelpFile.GetDictionaryCount: longint;
begin
Result := _Dictionary.Count;
end;
function THelpFile.GetDictionaryWord( Index: longint ): string;
begin
Result := _Dictionary[ Index ];
end;
// Looks for fonts that should be substitued to the
// users selected fixed font
// doesn't make a lot of sense for this to be here...
procedure THelpFile.SetupFontSubstitutes( Substitutions: string );
var
Item: string;
FontName: string;
SpacePos: longint;
W: longint;
H: longint;
i: longint;
pFontSpec: pTHelpFontSpec;
tmpSubstitutionItems : TStringList;
tmpCounter : integer;
tmpDimensionParts : TStringList;
s: string;
PointSize: word;
cp: integer;
begin
ParseFontTable; // (re)load table from raw data
tmpSubstitutionItems := TStringList.Create;
StrExtractStrings(tmpSubstitutionItems, Substitutions, [';'], #0);
for tmpCounter := 0 to tmpSubstitutionItems.Count - 1 do
begin
Item := tmpSubstitutionItems[tmpCounter];
try
if Item <> '' then
begin
// Look for space in xxxx WxH
SpacePos := LastDelimiter(' ', Item);
if SpacePos > 0 then
begin
// fontname comes before
FontName := StrLeft( Item, SpacePos - 1 );
Delete( Item, 1, SpacePos );
// width and height after, with an X between
tmpDimensionParts := TStringList.Create;
StrExtractStrings(tmpDimensionParts, Item, ['x'], #0);
W := StrToInt(tmpDimensionParts[0]);
H := StrToInt(tmpDimensionParts[1]);
tmpDimensionParts.Destroy;
if ( W > 0 ) and ( H > 0 ) then
begin
// Now look through the font table for matches
for i := 0 to _FontTable.Count - 1 do
begin
pFontSpec := _FontTable[ i ];
cp := pFontSpec^.Codepage;
s := StrNPas( pFontSpec^.FaceName, sizeof( pFontSpec^.FaceName ) );
if s = FontName then
begin
// same face name...
// this formula seems to give a simulated pointsize compared to
// what the original VIEW program intended.
PointSize := (pFontSpec^.Height * 2) div 3;
if ( H = PointSize ) then
begin
// match
pFontSpec^.Codepage := High(word); // font substitute marker added
// _FontTable[ i ] := SubstituteFixedFont;
end;
end;
end;
end;
end;
end;
except
end;
end;
tmpSubstitutionItems.Free;
end;
// -------------------------------------------------------------
// Get the title only from specific help file (if possible)
function GetHelpFileTitle( const Filename: string ): string;
var
Header: THelpFileHeader;
fstream: TFileStream;
Ext: string;
begin
Ext := ExtractFileExt( Filename );
Result := '';
if SameText( Ext, '.inf' )
or SameText( Ext, '.hlp' ) then
begin
try
try
fstream := TFileStream.Create(Filename, fmOpenRead);
fstream.Position := 0;
FillChar( Header, sizeof( Header ), 0 );
fstream.Read(Header, SizeOf(Header));
if Header.ID = INF_HEADER_ID then
Result := StrPas(Header.title);
except
// silently ignore errors - it's not to critical at this point.
end;
finally
fstream.Free;
end;
end;
end;
end.
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