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|
{
This file is part of the Free Component Library.
Copyright (c) 2015 by:
. Michael Van Canneyt michael@freepascal.org
. Silvio Clecio github.com/silvioprog
Text reader classes.
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.
**********************************************************************}
{$mode objfpc}
{$h+}
unit streamex;
Interface
uses
Classes, SysUtils, RtlConsts;
const
MIN_BUFFER_SIZE = 128;
BUFFER_SIZE = 4096;
FILE_RIGHTS = 438;
type
{ TBidirBinaryObjectReader }
TBidirBinaryObjectReader = class(TBinaryObjectReader)
protected
function GetPosition: Longint;
procedure SetPosition(const AValue: Longint);
public
property Position: Longint read GetPosition write SetPosition;
end;
{ TBidirBinaryObjectWriter }
TBidirBinaryObjectWriter = class(TBinaryObjectWriter)
protected
function GetPosition: Longint;
procedure SetPosition(const AValue: Longint);
public
property Position: Longint read GetPosition write SetPosition;
end;
{ TDelphiReader }
TDelphiReader = class(TReader)
protected
function GetPosition: LongInt;
procedure SetPosition(const AValue: LongInt);
function CreateDriver(Stream: TStream; BufSize: Integer): TAbstractObjectReader; override;
public
function GetDriver: TBidirBinaryObjectReader;
function ReadStr: string;
procedure Read(var Buf; Count: LongInt); override;
property Position: LongInt read GetPosition write SetPosition;
end;
{ TDelphiWriter }
TDelphiWriter = class(TWriter)
protected
function GetPosition: Longint;
procedure SetPosition(const AValue: LongInt);
function CreateDriver(Stream: TStream; BufSize: Integer): TAbstractObjectWriter; override;
public
function GetDriver: TBidirBinaryObjectWriter;
procedure FlushBuffer;
procedure Write(const Buf; Count: LongInt); override;
procedure WriteStr(const Value: string);
procedure WriteValue(Value: TValueType);
property Position: LongInt read GetPosition write SetPosition;
end;
{ TTextReader }
TTextReader = class(TObject)
Protected
function IsEof: Boolean; virtual; abstract;
public
constructor Create; virtual;
procedure Reset; virtual; abstract;
procedure Close; virtual; abstract;
procedure ReadLine(out AString: string); virtual; abstract; overload;
function ReadLine: string; overload;
property Eof: Boolean read IsEof;
end;
{ TStreamReader }
TStreamReader = class(TTextReader)
private
FBufferRead: Integer;
FBufferPosition: Integer;
FClosed,
FOwnsStream: Boolean;
FStream: TStream;
FBuffer: array of Byte;
procedure FillBuffer;
Protected
function IsEof: Boolean; override;
public
constructor Create(AStream: TStream; ABufferSize: Integer;
AOwnsStream: Boolean); virtual;
constructor Create(AStream: TStream); virtual;
destructor Destroy; override;
procedure Reset; override;
procedure Close; override;
procedure ReadLine(out AString: string); override; overload;
property BaseStream: TStream read FStream;
property OwnsStream: Boolean read FOwnsStream write FOwnsStream;
end;
{ TStringReader }
TStringReader = class(TTextReader)
private
FReader: TTextReader;
Protected
function IsEof: Boolean; override;
public
constructor Create(const AString: string; ABufferSize: Integer); virtual;
constructor Create(const AString: string); virtual;
destructor Destroy; override;
procedure Reset; override;
procedure Close; override;
procedure ReadLine(out AString: string); override; overload;
end;
{ TFileReader }
TFileReader = class(TTextReader)
private
FReader: TTextReader;
Protected
function IsEof: Boolean; override;
public
constructor Create(const AFileName: TFileName; AMode: Word;
ARights: Cardinal; ABufferSize: Integer); virtual;
constructor Create(const AFileName: TFileName; AMode: Word;
ABufferSize: Integer); virtual;
constructor Create(const AFileName: TFileName; ABufferSize: Integer); virtual;
constructor Create(const AFileName: TFileName); virtual;
destructor Destroy; override;
procedure Reset; override;
procedure Close; override;
procedure ReadLine(out AString: string); override; overload;
end;
{ allows you to represent just a small window of a bigger stream as a substream.
also makes sure one is actually at the correct position before clobbering stuff. }
TWindowedStream = class(TOwnerStream)
private
fStart : Int64; // in the source.
fFrontier : Int64; // in the source.
fStartingPositionHere : Int64; // position in this Stream corresponding to Position = fStart in the source.
fPositionHere : Int64; // position in this Stream.
protected
//function GetPosition() : Int64; override; = Seek(0, soCurrent) already.
function GetSize() : Int64; override;
procedure SetSize(const NewSize: Int64); override; overload;
public
constructor Create(aStream : TStream; const aSize : Int64; const aPositionHere : Int64 = 0);
destructor Destroy(); override;
function Read(var aBuffer; aCount : longint) : longint; override;
function Write(const aBuffer; aCount : Longint): Longint; override;
function Seek(const aOffset: Int64; aOrigin: TSeekorigin): Int64; override;
end;
TStreamHelper = class helper for TStream
function ReadWordLE :word;
function ReadDWordLE:dword;
function ReadQWordLE:qword;
procedure WriteWordLE (w:word);
procedure WriteDWordLE(dw:dword);
procedure WriteQWordLE(dq:qword);
function ReadWordBE :word;
function ReadDWordBE:dword;
function ReadQWordBE:qword;
procedure WriteWordBE (w:word);
procedure WriteDWordBE(dw:dword);
procedure WriteQWordBE(dq:qword);
function ReadSingle:Single;
function ReadDouble:Double;
procedure WriteSingle(s:Single);
procedure WriteDouble(d:double);
{$ifndef FPC}
function ReadByte : Byte;
function ReadWord : Word;
function ReadDWord : DWord;
function ReadQWord : QWord;
procedure WriteByte (b : Byte);
procedure WriteWord (b : word);
procedure WriteDWord (b : DWord);
procedure WriteQWord (b : QWord);
{$endif}
end;
Implementation
ResourceString
SErrCannotWriteOutsideWindow = 'Cannot write outside allocated window.';
SErrInvalidSeekWindow = 'Cannot seek outside allocated window.';
SErrInvalidSeekOrigin = 'Invalid seek origin.';
SErrCannotChangeWindowSize = 'Cannot change the size of a windowed stream';
{ TBidirBinaryObjectReader }
function TBidirBinaryObjectReader.GetPosition: Longint;
begin
Result := FStream.Position - (FBufEnd - FBufPos);
end;
procedure TBidirBinaryObjectReader.SetPosition(const AValue: Longint);
begin
FStream.Position := AValue;
FBufPos := 0;
FBufEnd := 0;
end;
{ TBidirBinaryObjectWriter }
function TBidirBinaryObjectWriter.GetPosition: Longint;
begin
Result := FStream.Position - (FBufEnd - FBufPos);
end;
procedure TBidirBinaryObjectWriter.SetPosition(const AValue: Longint);
begin
FStream.Position := AValue;
FBufPos := 0;
FBufEnd := 0;
end;
{ TDelphiReader }
function TDelphiReader.GetDriver: TBidirBinaryObjectReader;
begin
Result := (Driver as TBidirBinaryObjectReader);
end;
function TDelphiReader.GetPosition: LongInt;
begin
Result := GetDriver.Position;
end;
procedure TDelphiReader.SetPosition(const AValue: LongInt);
begin
GetDriver.Position := AValue;
end;
function TDelphiReader.CreateDriver(Stream: TStream; BufSize:
Integer): TAbstractObjectReader;
begin
Result := TBidirBinaryObjectReader.Create(Stream, BufSize);
end;
function TDelphiReader.ReadStr: string;
begin
Result := GetDriver.ReadStr;
end;
procedure TDelphiReader.Read(var Buf; Count: LongInt);
begin
GetDriver.Read(Buf, Count);
end;
{ TDelphiWriter }
function TDelphiWriter.GetDriver: TBidirBinaryObjectWriter;
begin
Result := (Driver as TBidirBinaryObjectWriter);
end;
function TDelphiWriter.GetPosition: LongInt;
begin
Result := GetDriver.Position;
end;
procedure TDelphiWriter.SetPosition(const AValue: LongInt);
begin
GetDriver.Position := AValue;
end;
function TDelphiWriter.CreateDriver(Stream: TStream; BufSize: Integer): TAbstractObjectWriter;
begin
Result := TBidirBinaryObjectWriter.Create(Stream, BufSize);
end;
procedure TDelphiWriter.FlushBuffer;
begin
GetDriver.FlushBuffer();
end;
procedure TDelphiWriter.Write(const Buf; Count: Longint);
begin
GetDriver.Write(Buf, Count);
end;
procedure TDelphiWriter.WriteStr(const Value: string);
begin
GetDriver.WriteStr(Value);
end;
procedure TDelphiWriter.WriteValue(Value: TValueType);
begin
GetDriver.WriteValue(Value);
end;
{ TTextReader }
constructor TTextReader.Create;
begin
inherited Create;
end;
function TTextReader.ReadLine: string;
begin
ReadLine(Result);
end;
{ TStreamReader }
constructor TStreamReader.Create(AStream: TStream; ABufferSize: Integer;
AOwnsStream: Boolean);
begin
inherited Create;
if not Assigned(AStream) then
raise EArgumentException.CreateFmt(SParamIsNil, ['AStream']);
FStream := AStream;
FOwnsStream := AOwnsStream;
FClosed:=False;
if ABufferSize >= MIN_BUFFER_SIZE then
SetLength(FBuffer, ABufferSize)
else
SetLength(FBuffer, MIN_BUFFER_SIZE);
end;
constructor TStreamReader.Create(AStream: TStream);
begin
Create(AStream, BUFFER_SIZE, False);
end;
destructor TStreamReader.Destroy;
begin
Close;
inherited Destroy;
end;
procedure TStreamReader.FillBuffer;
begin
if FClosed then
begin
FBufferRead:=0;
FBufferPosition:=0;
end
else
begin
FBufferRead := FStream.Read(FBuffer[0], Pred(Length(FBuffer)));
FBuffer[FBufferRead] := 0;
FBufferPosition := 0;
end;
end;
procedure TStreamReader.Reset;
begin
FBufferRead := 0;
FBufferPosition := 0;
if Assigned(FStream) then
FStream.Seek(0, 0);
end;
procedure TStreamReader.Close;
begin
if FOwnsStream then
FreeAndNil(FStream);
FClosed:=True;
end;
function TStreamReader.IsEof: Boolean;
begin
if FClosed or not Assigned(FStream) then
Exit(True);
Result := FBufferPosition >= FBufferRead;
if Result then
begin
FillBuffer;
Result := FBufferRead = 0;
end;
end;
procedure TStreamReader.ReadLine(out AString: string);
var
VPByte: PByte;
VPosition, VStrLength, VLength: Integer;
begin
VPosition := FBufferPosition;
SetLength(AString, 0);
if FClosed then exit;
repeat
VPByte := @FBuffer[FBufferPosition];
while (FBufferPosition < FBufferRead) and not (VPByte^ in [10, 13]) do
begin
Inc(VPByte);
Inc(FBufferPosition);
end;
if FBufferPosition = FBufferRead then
begin
VLength := FBufferPosition - VPosition;
if VLength > 0 then
begin
VStrLength := Length(AString);
SetLength(AString, VStrLength + VLength);
Move(FBuffer[VPosition], AString[Succ(VStrLength)], VLength);
end;
FillBuffer;
VPosition := FBufferPosition;
end;
until (FBufferPosition = FBufferRead) or (VPByte^ in [10, 13]);
VLength := FBufferPosition - VPosition;
if VLength > 0 then
begin
VStrLength := Length(AString);
SetLength(AString, VStrLength + VLength);
Move(FBuffer[VPosition], AString[Succ(VStrLength)], VLength);
end;
if (VPByte^ in [10, 13]) and (FBufferPosition < FBufferRead) then
begin
Inc(FBufferPosition);
if VPByte^ = 13 then
begin
if FBufferPosition = FBufferRead then
FillBuffer;
if (FBufferPosition < FBufferRead) and (FBuffer[FBufferPosition] = 10) then
Inc(FBufferPosition);
end;
end;
end;
{ TStringReader }
constructor TStringReader.Create(const AString: string; ABufferSize: Integer);
begin
inherited Create;
FReader := TStreamReader.Create(TStringStream.Create(AString), ABufferSize, True);
end;
constructor TStringReader.Create(const AString: string);
begin
Create(AString, BUFFER_SIZE);
end;
destructor TStringReader.Destroy;
begin
FReader.Free;
inherited Destroy;
end;
procedure TStringReader.Reset;
begin
FReader.Reset;
end;
procedure TStringReader.Close;
begin
FReader.Close;
end;
function TStringReader.IsEof: Boolean;
begin
Result := FReader.IsEof;
end;
procedure TStringReader.ReadLine(out AString: string);
begin
FReader.ReadLine(AString);
end;
{ TFileReader }
constructor TFileReader.Create(const AFileName: TFileName; AMode: Word;
ARights: Cardinal; ABufferSize: Integer);
begin
inherited Create;
FReader := TStreamReader.Create(TFileStream.Create(AFileName, AMode, ARights),
ABufferSize, True);
end;
constructor TFileReader.Create(const AFileName: TFileName; AMode: Word;
ABufferSize: Integer);
begin
Create(AFileName, AMode, FILE_RIGHTS, ABufferSize);
end;
constructor TFileReader.Create(const AFileName: TFileName; ABufferSize: Integer);
begin
Create(AFileName, fmOpenRead or fmShareDenyWrite, ABufferSize);
end;
constructor TFileReader.Create(const AFileName: TFileName);
begin
Create(AFileName, BUFFER_SIZE);
end;
destructor TFileReader.Destroy;
begin
FReader.Free;
inherited Destroy;
end;
procedure TFileReader.Reset;
begin
FReader.Reset;
end;
procedure TFileReader.Close;
begin
FReader.Close;
end;
function TFileReader.IsEof: Boolean;
begin
Result := FReader.IsEof;
end;
procedure TFileReader.ReadLine(out AString: string);
begin
FReader.ReadLine(AString);
end;
{ TStreamHelper }
function TStreamHelper.readwordLE:word;
begin
result:=LEtoN(readword);
end;
function TStreamHelper.readdwordLE:dword;
begin
result:=LEtoN(readdword);
end;
function TStreamHelper.readqwordLE:qword;
begin
result:=LEtoN(readqword);
end;
function TStreamHelper.readwordBE:word;
begin
result:=BEtoN(readword);
end;
function TStreamHelper.readdwordBE:dword;
begin
result:=BEtoN(readdword);
end;
function TStreamHelper.readqwordBE:qword;
begin
result:=BEtoN(readqword);
end;
procedure TStreamHelper.WriteWordBE(w:word);
begin
WriteWord(NtoBE(w));
end;
procedure TStreamHelper.WriteDWordBE(dw:dword);
begin
WriteDWord(NtoBE(dw));
end;
procedure TStreamHelper.WriteQWordBE(dq:qword);
begin
WriteQWord(NtoBE(dq));
end;
procedure TStreamHelper.WriteWordLE(w:word);
begin
WriteWord(NtoLE(w));
end;
procedure TStreamHelper.WriteDWordLE(dw:dword);
begin
WriteDWord(NtoLE(dw));
end;
procedure TStreamHelper.WriteQWordLE(dq:qword);
begin
WriteQWord(NtoLE(dq));
end;
function TStreamHelper.ReadSingle:Single;
begin
self.Read(result,sizeof(result));
end;
function TStreamHelper.ReadDouble:Double;
begin
self.Read(result,sizeof(result));
end;
procedure TStreamHelper.WriteSingle(s:Single);
begin
self.Write(s,sizeof(s));
end;
procedure TStreamHelper.WriteDouble(d:double);
begin
self.Write(d,sizeof(d));
end;
{$ifndef FPC}
// there can only be one helper per class, and I use these in Delphi for FPC compatibility.
function TStreamHelper.ReadByte: Byte;
begin
self.Read(result,sizeof(result));
end;
function TStreamHelper.ReadDWord: DWord;
begin
self.Read(result,sizeof(result));
end;
function TStreamHelper.ReadWord: Word;
begin
self.Read(result,sizeof(result));
end;
procedure TStreamHelper.WriteByte(b: Byte);
begin
self.Write(b,sizeof(b));
end;
procedure TStreamHelper.WriteDWord(b: DWord);
begin
self.Write(b,sizeof(b));
end;
procedure TStreamHelper.WriteWord(b: Word);
begin
self.Write(b,sizeof(b));
end;
{$endif}
{ TWindowedStream }
constructor TWindowedStream.Create(aStream : TStream; const aSize : Int64; const aPositionHere : Int64 = 0);
begin
inherited Create(aStream);
fStart := aStream.Position;
fFrontier := fStart + aSize;
fStartingPositionHere := aPositionHere;
fPositionHere := aPositionHere;
end;
destructor TWindowedStream.Destroy();
begin
inherited Destroy();
end;
function TWindowedStream.Read(var aBuffer; aCount : longint) : longint;
var
vSourcePosition : Int64;
vNewSourcePosition : Int64;
begin
vSourcePosition := Source.Position;
vNewSourcePosition := fStart + fPositionHere - fStartingPositionHere;
if vNewSourcePosition <> vSourcePosition then // someone modified the file position. Bad bad.
Source.Seek(vNewSourcePosition, 0);
if vNewSourcePosition + aCount > fFrontier then // trying to access outside.
aCount := fFrontier - vNewSourcePosition;
Result := Source.Read(aBuffer, aCount);
Inc(fPositionHere, Result);
end;
function TWindowedStream.Write(const aBuffer; aCount : Longint): Longint;
var
vSourcePosition : Int64;
vNewSourcePosition : Int64;
begin
vSourcePosition := Source.Position;
vNewSourcePosition := fStart + fPositionHere - fStartingPositionHere;
if vNewSourcePosition <> vSourcePosition then // someone modified the file position. Bad bad.
Source.Seek(vNewSourcePosition, 0);
if vNewSourcePosition + aCount > fFrontier then // trying to access outside.
Raise EWriteError.Create(SErrCannotWriteOutsideWindow);
//aCount := fFrontier - vNewSourcePosition;
Result := Source.Write(aBuffer, aCount);
Inc(fPositionHere, Result);
end;
function TWindowedStream.Seek(const aOffset: Int64; aOrigin: TSeekOrigin): Int64;
var
vNewPositionHere : Int64;
vSourcePosition : Int64;
begin
{
here there
fStartingPositionHere .... fStart
fPositionHere............. x
}
if (aOrigin = soCurrent) and (aOffset = 0) then begin // get position.
Result := fPositionHere;
Exit;
end;
if aOrigin = soBeginning then
vNewPositionHere := aOffset
else if aOrigin = soCurrent then
vNewPositionHere := fPositionHere + aOffset
else if aOrigin = soEnd then
vNewPositionHere := fStartingPositionHere + fFrontier - fStart + aOffset
else
raise EReadError.Create(SErrInvalidSeekOrigin);
vSourcePosition := fStart + vNewPositionHere - fStartingPositionHere;
if (vSourcePosition < 0) or (vSourcePosition >= fFrontier) then
raise EReadError.Create(SErrInvalidSeekWindow);
Result := Source.Seek(vSourcePosition, 0);
//if Result = -1 ??? can that happen?
Result := vNewPositionHere;
end;
function TWindowedStream.GetSize() : Int64;
begin
Result := fFrontier - fStart;
end;
procedure TWindowedStream.SetSize(const NewSize: Int64); overload;
begin
if NewSize = Self.GetSize() then
Exit;
raise EWriteError.Create(SErrCannotChangeWindowSize);
end;
end.
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