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{
This file is part of the Free Pascal run time library.
Copyright (c) 2008 by Giulio Bernardi
String table classes used internally by readers and writers
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.
**********************************************************************}
unit strtable;
{$MODE OBJFPC} {$H+}
interface
uses
Classes;
type
{ TResStringTable }
TResStringTable = class
private
fStartOfs : longword;
fData : TMemoryStream;
fUsed : boolean;
function GetSize : longword;
public
constructor Create;
destructor Destroy; override;
function Add(s : string) : longword;
procedure Clear;
procedure WriteToStream(aStream : TStream);
property StartOfs : longword read fStartOfs write fStartOfs;
property Size : longword read GetSize;
property Used : boolean read fUsed;
end;
{ TObjectStringTable }
TObjectStringTable = class
private
fData : TMemoryStream;
fStartOfs : longword;
function GetSize : longword;
protected
public
constructor Create(aStream : TStream; aSize : longword);
destructor Destroy; override;
function Get(aOffset : longword) : string;
function Add(aString : string) : longword;
procedure Clear;
procedure WriteToStream(aStream : TStream);
property Size : longword read GetSize;
property StartOfs : longword read fStartOfs write fStartOfs;
end;
implementation
{ TResStringTable }
function TResStringTable.GetSize: longword;
begin
Result:=fData.Size;
end;
constructor TResStringTable.Create;
var b : byte;
begin
fStartOfs:=0;
fData:=TMemoryStream.Create;
b:=0;
fData.WriteBuffer(b,1);
fUsed:=false;
end;
destructor TResStringTable.Destroy;
begin
fData.Free;
end;
function TResStringTable.Add(s: string): longword;
var b : byte;
begin
fUsed:=true;
Result:=fData.Position;
if s='' then Result:=0
else
begin
fData.WriteBuffer(s[1],length(s));
b:=0;
fData.WriteBuffer(b,1);
end;
end;
procedure TResStringTable.Clear;
begin
fStartOfs:=0;
fData.SetSize(1);
fData.Position:=1;
fUsed:=false;
end;
procedure TResStringTable.WriteToStream(aStream: TStream);
var oldpos : int64;
begin
oldpos:=fData.Position;
try
fData.Position:=0;
aStream.CopyFrom(fData,fData.Size);
finally
fData.Position:=oldpos;
end;
end;
{ TObjectStringTable }
function TObjectStringTable.GetSize: longword;
begin
Result:=fData.Size;
end;
constructor TObjectStringTable.Create(aStream: TStream; aSize: longword);
var b : byte;
begin
fData:=TMemoryStream.Create;
fData.Position:=0;
if aStream=nil then
begin
b:=0;
fData.WriteBuffer(b,1);
end
else
fData.CopyFrom(aStream,aSize);
end;
destructor TObjectStringTable.Destroy;
begin
fData.Free;
end;
function TObjectStringTable.Get(aOffset: longword): string;
var c : char;
begin
Result:='';
fData.Position:=aOffset;
repeat
fData.ReadBuffer(c,1);
if c<>#0 then Result:=Result+c;
until (c=#0) or (fData.Position>=fData.Size);
end;
function TObjectStringTable.Add(aString: string) : longword;
var b : byte;
begin
Result:=fData.Position;
if aString='' then Result:=0
else
begin
fData.WriteBuffer(aString[1],length(aString));
b:=0;
fData.WriteBuffer(b,1);
end;
end;
procedure TObjectStringTable.Clear;
begin
fData.SetSize(1);
fData.Position:=1;
end;
procedure TObjectStringTable.WriteToStream(aStream: TStream);
begin
fData.Position:=0;
aStream.CopyFrom(fData,fData.Size);
end;
end.
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