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| Const
{ DefaultBufferedStreamBlockSize : par défaut tampon de 64Mo }
DefaultBufferedStreamBlockSize = 1024 * 1024 * 64;
DefaultCharsDelims = #8#9#10#13#32;
Type
{ TBZCustomBufferedStream: Classe d'aide à la lecture et ou ecriture de données dans un flux (TStream).@br
L'acces se fait par le biais d'un tampon de taille définie.
L'acces aux données est un acces directe en mémoire et se fait de façon séquentielle.@br
TBZCustomBufferedStream contient de nombreuse procedures et fonctions optimisées
pour la lecture et l'écriture de valeurs de différents types.@br
Disponibles en 2 versions "Little-Endian" ( et "Big-Endian" non codé encore).
Cette classe ameliore surtout les performances d'accès aux données de fichiers physique.@br
Ne pas employer directement TBZCustomBufferedStream. Utilsez la classe TBZBufferedStream
et les autres classes descendantes.
}
TBZCustomBufferedStream = Class(TStream)
Private
Procedure LoadBuffer; Virtual;//(var Buf; BufSize: integer) : integer; virtual;
Procedure WriteBuffer; Virtual;
Protected
Stream: TStream; // Les données que l'on veux exploiter
StreamSize: Int64; // La taille des données du stream
StreamPosition: Int64; // Position dans le stream
AutoFreeStream: Boolean; //Indicateur si l'on doit libérer le stream ou pas
StreamViewStart, StreamViewEnd, StreamViewLength: Int64; // position et longueur du tampon dans le stream
//StreamViewStartPtr, FZStreamViewEndPtr : PByte; // pointe directement sur le debut ou la fin peut-être utile dans certain cas (lecture depuis la fin par ex)
StreamBytesLeft: Int64; // Nombre d'octet qui reste à lire
StreamBytesRead: Int64; // Nombre d'octet deja lu (égual à FZStreamPosition+1)
Buffer: Pointer; //PByte; // Tampon mémoire pour l'acces au donnée par bloque
BufferDefaultSize: Int64; // Taille du tampon par defaut
BufferSize: Int64; // Taille réelle du tampon
BufferPosition: Int64; // Position dans le tampon
BufferBytesRead, BufferBytesWrite: Int64; // Nombre d'octet deja lu ou écrit dans le tampon
BufferBytesLeft: Int64; // Nombre d'octet qui reste à lire dans le tampon
FUseAlignedCache: Boolean; // On aligne la taille du tampon sur 32bit (accélère les échanges mémoire dans certain cas)
StrideSize: Byte; //Taille en octet à ajouté à la fin du tampon pour l'alignement des données
NeedStreamWrite : Boolean;
BytesInBuf : Integer;
BytesWritten: Integer;
Procedure SetSize(Const NewSize: Int64); Override;
Function GetStreamPosition: Int64;
Public
{ @name : Create new buffered stream with a define Block Size (default 64Mb) }
Constructor Create(Const aBlockSize: Integer = DefaultBufferedStreamBlockSize);
{ @name : Create new buffered stream from a legacy TStream object with a define Block Size (default 64Mb) }
Constructor Create(AStream: TStream; Const aBlockSize: Integer = DefaultBufferedStreamBlockSize); Overload;
{ @name : Destroy the stream }
Destructor Destroy; Override;
{ @name : Assign raw buffer to data }
Procedure AssignBuffer(aBuffer: Pointer; aSize: Longint);
{ @name : Assign legacy TStream object }
Procedure AssignStream(aStream: TStream);
{ @name : Empty cache buffer }
Procedure Flush;
{ @name : Read data of size "Count" and stored values in "aBuffer" }
Function Read(Var aBuffer; Count: Longint): Longint; Override;
{ @name : Write a Buffer data of size "Count" in Buffered Stream }
Function Write(Const aBuffer; Count: Longint): Longint; Override;
{ @name : Move at position "Offset" according to the "Origin" }
Function Seek(Const Offset: Int64; Origin: TSeekOrigin): Int64; Override;
Function SeekForward(Offset : Int64):Int64;
Function SeekBackward(Offset : Int64):Int64;
{ Routines de lecture et de déplacement dans le tampon }
{ @name : Read a byte at the current position }
Function ReadByte: Byte;
{ @name : Write a Byte value at the current position }
procedure WriteByte(Const Value : Byte);
{ @name : Skip next byte from the current position }
Procedure SkipNextByte(Const aCount: Integer = 1);
{ @name : Move to previous byte from the current position }
Procedure GotoPreviousByte(Const aCount: Integer = 1);
{ @name : If data is text, move to the next string Line }
Procedure GotoNextStringLine;
{ @name : Read a Word value at the current position }
Function ReadWord: Word;
procedure WriteWord(Const Value : Word);
{ @name : Read an Integer value at the current position }
Function ReadInteger: Integer;
{ @name : Write an Integer value at the current position }
procedure WriteInteger(Const Value : Integer);
{ @name : Read a LongWord value at the current position }
Function ReadLongWord: Longword;
{ @name : Write a LongWord value at the current position }
procedure WriteLongWord(Const Value : LongWord);
{ @name : Read a LongInt value at the current position }
Function ReadLongint: Longint;
{ @name : Write a Longint value at the current position }
procedure WriteLongint(Const Value : Longint);
{ @name : Read a Cardinal value at the current position }
Function ReadCardinal: Cardinal;
{ @name : Write a Cardinal value at the current position }
procedure WriteCardinal(Const Value : Cardinal);
{ @name : Read a Single value at the current position }
Function ReadSingle: Single;
{ @name : Write a Single value at the current position }
procedure WriteSingle(Const Value : Single);
{ @name : Read a Double value at the current position }
Function ReadDouble: Double;
{ @name : Write a Double value at the current position }
procedure WriteDouble(Const Value : Double);
{ @name : Read a Char value at the current position }
Function ReadChar: Char;
{ @name : Write a Char value at the current position }
procedure WriteChar(Const Value : Char);
{ @name : Read the next char without moving position }
Function ReadNextChar: Char;
{ @name : Skip chars in CharsDelim. (By default Space, tab, EOL) }
Procedure SkipChar(Const CharsDelim: String = DefaultCharsDelims);
{@name : Read full line of text }
Function ReadLnString: String;
//procedure WriteLnString(Const Value : String);
{ @name : Read a string of undefined length }
Function ReadString: String;
//procedure WriteString(Const Value : String);
{ @name : Read a string of length "len" }
Function ReadString(len: Integer): String; Overload;
{ @name : Read a token string delimited by "CharsDelim" }
Function ReadStrToken(Const CharsDelim: String = DefaultCharsDelims): String;
{ @name : Read an Integer token from data string }
Function ReadStrIntToken: Integer;
{ @name : Clear data and set to ZERO }
Procedure Clear;
{ @name : Returns the raw datas }
Function GetBuffer: Pointer;
{ @name : Save stream }
procedure Save;
{ @name : Returns the buffer as a string. @br
*****Warning: Max 64MB or the size you've defined when creating TBZBufferdStream }
Function GetBufferAsString: String;
{ @name : Check if we are on the End of Stream }
Function EOS: Boolean;
//property UseAlignedCache: Boolean read FUseAlignedCache write FUseAlignedCache;
{ Get the total of stream }
Property Size: Int64 read StreamSize;
{ Get current postion in the stream }
Property position: Int64 read GetStreamPosition;
property BytesLeft : Int64 read BufferBytesLeft;
End;
{ @name : Descendant class type of TBZCustomBufferedStream }
TBZCustomBufferedStreamClass = Class Of TBZCustomBufferedStream;
{ TBZBufferedStream : See @link(TBZCustomBufferedStream) for more informations }
TBZBufferedStream = Class(TBZCustomBufferedStream);
Implementation
{%region%=====[ TBZCustomBufferedStream ]=====================================}
Constructor TBZCustomBufferedStream.Create(Const aBlockSize: Integer = DefaultBufferedStreamBlockSize);
Begin
Inherited Create;
Buffer := nil;
BufferDefaultSize := aBlockSize;
BufferSize := BufferDefaultSize;
BufferBytesRead := 0;
BufferBytesLeft := -1;
BufferPosition := 0;
Stream := nil;
StreamSize := BufferSize;
StreamPosition := 0;
StreamViewStart := 0;
StreamViewEnd := 0;
StreamViewLength := 0;
AutoFreeStream := False;
StreamBytesLeft := 0;
StreamBytesRead := 0;
NeedStreamWrite := False;
BytesInBuf := 0;
End;
Constructor TBZCustomBufferedStream.Create(AStream: TStream; Const aBlockSize: Integer = DefaultBufferedStreamBlockSize);
Begin
Inherited Create;
Buffer := nil;
BufferDefaultSize := aBlockSize;
BufferSize := BufferDefaultSize;
BufferBytesRead := 0;
BufferBytesLeft := -1;
BufferPosition := 0;
Stream := nil;
StreamSize := BufferSize;
NeedStreamWrite := False;
BytesInBuf := 0;
Stream := AStream;
StreamSize := AStream.Size;
StreamPosition := 0;
StreamViewStart := 0;
StreamViewEnd := 0;
StreamViewLength := 0;
AutoFreeStream := False;
StreamBytesLeft := StreamSize;
StreamBytesRead := 0;
End;
Destructor TBZCustomBufferedStream.Destroy;
Begin
If AutoFreeStream Then FreeAndNil(Stream);
//FreeAndNil(Buffer);
ReAllocMem(Buffer, 0);
FreeMem(Buffer);
Buffer := nil;
Inherited Destroy;
End;
Procedure TBZCustomBufferedStream.Flush;
Begin
//Clear;
StreamViewStart := BufferPosition;
//StreamViewEnd :=
// StreamViewLength :=StreamViewEnd - StreamViewStart + 1;
StreamBytesLeft := StreamSize - BufferPosition;
BufferSize := BufferDefaultSize;
BufferBytesRead := 0;
BufferBytesLeft := -1;//BufferSize;
BufferPosition := 0;
BytesInBuf := 0;
NeedStreamWrite := False;
End;
Procedure TBZCustomBufferedStream.LoadBuffer;
Var
SeekResult: Integer;
RSize: Longint;
Begin
//GlobalLogger.LogNotice('Load Buffer from file');
// C'est la 1er fois ? on initialise le tampon
If Not (Assigned(Buffer)) Then SetSize(BufferDefaultSize);
// Fin des données, plus rien à lire, on remet tout a zero et on s'en va
If (StreamViewStart > StreamSize - 1) Or (StreamBytesLeft <= 0) Then
Begin
// BufferPosition:=0;
BufferBytesRead := 0;
BufferBytesLeft := 0;
StreamViewLength := 0;
StreamBytesLeft := 0;
StreamViewStart := 0;
StreamViewEnd := 0;
//EndOFZStream := true;
exit;
End;
// On se place sous la bonne fenètre
SeekResult := Stream.Seek(StreamViewStart, soBeginning);
If SeekResult = -1 Then
Raise EStreamError.Create('TBZCustomBufferedStream.LoadBuffer: Erreur lors du positionnement dans le flux');
If (StreamBytesLeft < BufferDefaultSize) Then
Rsize := StreamBytesLeft
Else
RSize := BufferDefaultSize;
// On lit les données, et on transfert dans le tampon
BufferSize := Stream.Read(Buffer^, RSize);
If BufferSize <= 0 Then
Raise EStreamError.Create('TBZCustomBufferedStream.LoadBuffer: Erreur lors de la Lecture du flux');
// On met à jour les marqueurs de la "fenêtre" de lecture du Stream pour le chargement
StreamPosition := StreamViewStart;
StreamViewLength := BufferSize;
StreamViewEnd := StreamViewStart + StreamViewLength - 1;
If StreamViewEnd >= StreamSize Then
Raise EStreamError.Create('TBZCustomBufferedStream.LoadBuffer: Index StreamViewEnd hors limite');
Dec(StreamBytesLeft, BufferSize);
Inc(StreamBytesRead, BufferSize);
// On reinitialise les marqueurs du Buffer
BufferPosition := 0;
BufferBytesRead := 0;
BufferBytesLeft := BufferSize;
End;
Procedure TBZCustomBufferedStream.WriteBuffer;
var
SeekResult: Integer;
begin
{$IFDEF DEBUG}GlobalLogger.LogNotice('Ecriture du fichier sur le disque');{$ENDIF}
If Not (Assigned(Buffer)) Then Exit; // rien à écrire
// if Not(NeedStreamWrite) or (BytesInBuf<=0) then exit; // On n'a pas demandé l'ecriture ou il n'y a rien à écrire
SeekResult := Stream.Seek(StreamViewStart, soBeginning);
if SeekResult = -1 then
raise EStreamError.Create('TBZCustomBufferedStream.WriteBuffer: Erreur lors du positionnement dans le flux');
BytesWritten := Stream.Write(Buffer^, BytesInBuf);
if BytesWritten <> BytesInBuf then
raise EStreamError.Create('TBZCustomBufferedStream.LoadBuffer: Erreur lors de l''ecriture du flux');
Dec(BytesInBuf,BytesWritten);
if BytesinBuf<>0 then ShowMessage('TBZCustomBufferedStream.LoadBuffer: Erreur probable lors de l''ecriture du flux');
NeedStreamWrite := False;
End;
Procedure TBZCustomBufferedStream.SetSize(Const NewSize: Int64);
Begin
ReAllocMem(Buffer, NewSize);
BufferSize := NewSize;
BufferPosition := 0;
BufferBytesRead := 0;
BufferBytesWrite := 0;
BufferBytesLeft := NewSize;
End;
Function TBZCustomBufferedStream.GetStreamPosition: Int64;
Begin
Result := StreamViewStart + BufferPosition;
End;
Function TBZCustomBufferedStream.Read(Var aBuffer; Count: Longint): Longint;
Var
NumOfBytesToCopy, NumOfBytesLeft: Longint; //, NumOfBytesRead
CachePtr, BufferPtr: PByte;
Begin
{$IFDEF DEBUG}
GlobalLogger.LogNotice('Read Data in Buffer : '+Inttostr(Count)+' Octets');
GlobalLogger.LogStatus(' - Stream Position : '+Inttostr(Position));
GlobalLogger.LogStatus(' - Buffer Position : '+Inttostr(BufferPosition));
GlobalLogger.LogStatus(' - Buffer Bytes Left : '+Inttostr(BufferBytesLeft));
GlobalLogger.LogStatus(' - Stream Bytes Left : '+Inttostr(StreamBytesLeft));
GlobalLogger.LogStatus(' - Stream Size : '+Inttostr(StreamSize));
GlobalLogger.LogStatus(' - Buffer Size : '+Inttostr(BufferSize));
{$ENDIF}
Result := 0;
If (StreamBytesLeft > 0) then NumOfBytesLeft := Count
else if (Count>BufferBytesLeft) then NumOfBytesLeft := BufferBytesLeft
else NumOfBytesLeft := Count;
BufferPtr := @aBuffer;
While NumOfBytesLeft > 0 Do
Begin
If (BufferBytesLeft <= 0) Then
Begin
//StreamViewStart := StreamViewStart + BufferPosition;
Flush;
LoadBuffer; // On charge un nouveau tampon depuis le stream
End;
// On copie les données
NumOfBytesToCopy := Min(BufferSize - BufferPosition, NumOfBytesLeft);
CachePtr := Buffer;
Inc(CachePtr, BufferPosition);
Move(CachePtr^, BufferPtr^, NumOfBytesToCopy);
Inc(Result, NumOfBytesToCopy);
Inc(BufferPosition, NumOfBytesToCopy);
Inc(BufferPtr, NumOfBytesToCopy);
// On met à jour les marqueur de notre tampon
Inc(BufferBytesRead, NumOfBytesToCopy);
Dec(BufferBytesLeft, NumOfBytesToCopy);
Dec(NumOfBytesLeft, NumOfBytesToCopy);
End;
{$IFDEF DEBUG}
GlobalLogger.LogStatus(' - New Buffer Position : '+Inttostr(BufferPosition));
GlobalLogger.LogStatus(' - New Stream Position : '+Inttostr(Position));
{$ENDIF}
End;
Function TBZCustomBufferedStream.Write(Const aBuffer; Count: Longint): Longint;
Var
NumOfBytesToCopy, NumOfBytesLeft, NumOfBytesWriteLeft: Longint;
CachePtr, BufferPtr: PByte;
// BytesWritten : Longint;
Begin
{$IFDEF DEBUG}
GlobalLogger.LogNotice('Write Data in Buffer : '+Inttostr(Count)+' Octets');
GlobalLogger.LogStatus(' - Stream Position : '+Inttostr(Position));
GlobalLogger.LogStatus(' - Buffer Position : '+Inttostr(BufferPosition));
GlobalLogger.LogStatus(' - Bytes in buf : '+Inttostr(BytesInBuf));
GlobalLogger.LogStatus(' - Stream Bytes Left : '+Inttostr(StreamBytesLeft));
GlobalLogger.LogStatus(' - Stream Size : '+Inttostr(StreamSize));
GlobalLogger.LogStatus(' - Buffer Size : '+Inttostr(BufferSize));
{$ENDIF}
Result := 0;
NumOfBytesLeft := Count;
// If (BufferSize>0) and (BytesInBuf+1 > pred(BufferSize)) Then Save;
If Not (Assigned(Buffer)) Then SetSize(BufferDefaultSize);
BufferPtr := @aBuffer;
// NumOfBytesToCopy := 0;
While NumOfBytesLeft > 0 Do
Begin
NumOfBytesToCopy := 0;
If (BufferPosition + NumOfBytesLeft) >= pred(BufferSize) Then NumOfBytesToCopy := Pred(BufferSize) - BufferPosition;
NumOfBytesWriteLeft := NumOfBytesLeft-NumOfBytesToCopy;
//if NumOfBytesWriteLeft < 0 then NumOfBytesWriteLeft:=0;
if NumOfBytesToCopy>0 then
begin
CachePtr := Buffer;
Inc(CachePtr, BufferPosition);
Move(BufferPtr^,CachePtr^, NumOfBytesToCopy);
//Inc(BufferPosition, NumOfBytesToCopy-1);
Inc(BufferPtr, NumOfBytesToCopy);
Inc(BytesInBuf, NumOfBytesToCopy); //BytesInBuf:=BufferSize;
BufferPosition := BytesInBuf-1; //-1 car on commence à la position 0
NeedStreamWrite := True;
WriteBuffer;
Inc(Result, NumOfBytesToCopy);
Dec(NumOfBytesLeft,NumOfBytesToCopy);
Flush;
end
else
begin
CachePtr := Buffer;
Inc(CachePtr, BufferPosition);
Move(BufferPtr^, CachePtr^, NumOfBytesWriteLeft);
//Inc(BufferPosition,NumOfBytesWriteLeft);
Inc(BytesInBuf,NumOfBytesWriteLeft);
BufferPosition := BytesInBuf;
Dec(NumOfBytesLeft,NumOfBytesWriteLeft);
Inc(Result,NumOfBytesWriteLeft);
End;
end;
end;
Function TBZCustomBufferedStream.Seek(Const Offset: Int64; Origin: TSeekOrigin): Int64;
Var
//NewBufStart,
NewPos: Integer;
Begin
// Calcul de la nouvelle position
Case Origin Of
soBeginning: NewPos := Offset;
soCurrent: NewPos := StreamViewStart + BufferPosition + Offset;
soEnd: NewPos := pred(StreamSize) - Offset;
Else
Raise Exception.Create('TBZCustomBufferedStream.Seek: Origine Invalide');
End;
Result :=NewPos;
// if Offset = 0 then exit;
// Calcul de la fenêtre du stream, alignement des données
// NewBufStart := NewPos and not Pred(BufferSize);
//NewBufStart := NewPos - (StreamViewStart mod BufferSize);
(* if NewBufStart <> StreamViewStart then
begin
StreamViewStart := NewBufStart;
StreamPosition := NewBufStart;
BufferBytesLeft:=0;
end
else StreamPosition := NewPos; //- NewBufStart; *)
if NeedStreamWrite then
begin
WriteBuffer;
NeedStreamWrite := False;
Flush;
end;
BufferPosition := NewPos;
BufferBytesLeft := BufferSize - BufferPosition;
Result := NewPos;
{$IFDEF DEBUG}
GlobalLogger.LogStatus(' - Seek New Buffer Position : '+Inttostr(BufferPosition));
GlobalLogger.LogStatus(' - Seek New Stream Position : '+Inttostr(Position));
{$ENDIF}
End;
Function TBZCustomBufferedStream.SeekForward(Offset: Int64): Int64;
Begin
result := Seek(Abs(Offset),soCurrent);
//SkipNextByte(Abs(Offset));
//result := Position;
End;
Function TBZCustomBufferedStream.SeekBackward(Offset: Int64): Int64;
Begin
if Offset>0 then Offset := -Offset;
result := Seek(Offset,soCurrent);
////Offset := Position - Offset;
////result := Seek(Offset,soBeginning);
//GotoPreviousByte(Abs(Offset));
//result := Position;
End;
Procedure TBZCustomBufferedStream.AssignBuffer(aBuffer: Pointer; aSize: Longint);
Begin
SetSize(aSize);
Move(aBuffer^, Buffer, aSize);
End;
Procedure TBZCustomBufferedStream.Save;
begin
if BytesInBuf>0 then
begin
NeedStreamWrite := True;
WriteBuffer;
Flush;
End;
End;
Procedure TBZCustomBufferedStream.AssignStream(aStream: TStream);
Var
ms: TMemoryStream;
Begin
If (aStream Is TCustomMemoryStream) Then
Begin
// AssignBuffer(TCustomMemoryStream(aStream).Memory,aStream.Size);
Stream := TCustomMemoryStream(aStream);
StreamSize := TCustomMemoryStream(aStream).Size;
StreamPosition := 0;
StreamViewStart := 0;
StreamViewEnd := StreamSize - 1;
StreamViewLength := StreamSize;
StreamBytesLeft := StreamSize;
StreamBytesRead := 0;
AutoFreeStream := False;
End
Else
Begin
ms := TMemoryStream.Create;
With ms Do
Begin
CopyFrom(aStream, 0);
Position := 0;
End;
Stream := ms;
StreamSize := ms.Size;
StreamPosition := 0;
StreamViewStart := 0;
StreamViewEnd := StreamSize - 1;
StreamViewLength := StreamSize;
StreamBytesLeft := StreamSize;
StreamBytesRead := 0;
AutoFreeStream := True;
End;
End;
Function TBZCustomBufferedStream.ReadByte: Byte;
Begin
If (BufferBytesLeft < 1) Then
Begin
Flush;
LoadBuffer;
End;
Result := PByte(Buffer + BufferPosition)^;
Inc(BufferPosition);
Inc(BufferBytesRead);
Dec(BufferBytesLeft);
End;
Procedure TBZCustomBufferedStream.WriteByte(Const Value: Byte);
Begin
If (BufferSize>0) and (BytesInBuf+1 > pred(BufferSize)) Then Save;
If Not (Assigned(Buffer)) Then SetSize(BufferDefaultSize);
PByte(Buffer + BufferPosition)^ := value;
Inc(BufferPosition);
Inc(BytesInBuf);
End;
Procedure TBZCustomBufferedStream.SkipNextByte(Const aCount: Integer = 1);
Begin
If (BufferBytesLeft < aCount) Then
Begin
Flush;
LoadBuffer;
End;
Inc(BufferPosition, aCount);
Inc(BufferBytesRead, aCount);
Dec(BufferBytesLeft, aCount);
End;
Procedure TBZCustomBufferedStream.GotoPreviousByte(Const aCount: Integer = 1);
Begin
{ TODO 0 -oBZStreamClasses -cTBZCustomBufferedStream : GotoPreviousByte. Gérer le rechargement en arriere du buffer }
Dec(BufferPosition,aCount);
Dec(BufferBytesRead,aCount);
Inc(BufferBytesLeft,aCount);
End;
Function TBZCustomBufferedStream.ReadWord: Word;
Begin
If (BufferBytesLeft < 2) Then
Begin
flush;
loadbuffer;
End;
Result := PWord(Buffer + BufferPosition)^;
Inc(BufferPosition, 2);
Inc(BufferBytesRead, 2);
Dec(BufferBytesLeft, 2);
End;
Procedure TBZCustomBufferedStream.WriteWord(Const Value: Word);
Begin
If (BufferSize>0) and ((BytesInBuf+2) > pred(BufferSize)) Then Save;
If Not (Assigned(Buffer)) Then SetSize(BufferDefaultSize);
PWord(Buffer + BufferPosition)^ := value;
Inc(BufferPosition,2);
Inc(BytesInBuf,2);
End;
Function TBZCustomBufferedStream.ReadInteger: Integer;
Begin
If (BufferBytesLeft < 4) Then
Begin
flush;
loadbuffer;
End;
Result := PInteger(Buffer + BufferPosition)^;
Inc(BufferPosition, 4);
Inc(BufferBytesRead, 4);
Dec(BufferBytesLeft, 4);
End;
Procedure TBZCustomBufferedStream.WriteInteger(Const Value: Integer);
Begin
If (BufferSize>0) and ((BytesInBuf+4) > pred(BufferSize)) Then Save;
If Not (Assigned(Buffer)) Then SetSize(BufferDefaultSize);
PInteger(Buffer + BufferPosition)^ := value;
Inc(BufferPosition,4);
Inc(BytesInBuf,4);
End;
Function TBZCustomBufferedStream.ReadLongint: Longint;
Begin
If (BufferBytesLeft < 4) Then
Begin
flush;
loadbuffer;
End;
Result := PLongint(Buffer + BufferPosition)^;
Inc(BufferPosition, 4);
Inc(BufferBytesRead, 4);
Dec(BufferBytesLeft, 4);
End;
Procedure TBZCustomBufferedStream.WriteLongint(Const Value: Longint);
Begin
If (BufferSize>0) and ((BytesInBuf+4) > pred(BufferSize)) Then Save;
If Not (Assigned(Buffer)) Then SetSize(BufferDefaultSize);
PLongint(Buffer + BufferPosition)^ := value;
Inc(BufferPosition,4);
Inc(BytesInBuf,4);
End;
Function TBZCustomBufferedStream.ReadLongWord: Longword;
Begin
If (BufferBytesLeft < 4) Then
Begin
flush;
loadbuffer;
End;
Result := PLongWord(Buffer + BufferPosition)^;
Inc(BufferPosition, 4);
Inc(BufferBytesRead, 4);
Dec(BufferBytesLeft, 4);
End;
Procedure TBZCustomBufferedStream.WriteLongWord(Const Value: LongWord);
Begin
If (BufferSize>0) and ((BytesInBuf+4) > pred(BufferSize)) Then Save;
If Not (Assigned(Buffer)) Then SetSize(BufferDefaultSize);
PLongWord(Buffer + BufferPosition)^ := value;
Inc(BytesInBuf,4);
BufferPosition := BytesInBuf;
End;
Function TBZCustomBufferedStream.ReadCardinal: Cardinal;
Begin
If (BufferBytesLeft < 4) Then
Begin
flush;
loadbuffer;
End;
Result := PCardinal(Buffer + BufferPosition)^;
Inc(BufferPosition, 4);
Inc(BufferBytesRead, 4);
Dec(BufferBytesLeft, 4);
End;
Procedure TBZCustomBufferedStream.WriteCardinal(Const Value: Cardinal);
Begin
If (BufferSize>0) and ((BytesInBuf+4) > pred(BufferSize)) Then Save;
If Not (Assigned(Buffer)) Then SetSize(BufferDefaultSize);
PCardinal(Buffer + BufferPosition)^ := value;
Inc(BufferPosition,4);
Inc(BytesInBuf,4);
End;
Function TBZCustomBufferedStream.ReadSingle: Single;
Var
ts: Byte;
Begin
ts := SizeOf(Single);
If (BufferBytesLeft < ts) Then
Begin
flush;
loadbuffer;
End;
Result := PSingle(Buffer + BufferPosition)^;
Inc(BufferPosition, ts);
Inc(BufferBytesRead, ts);
Dec(BufferBytesLeft, ts);
End;
Procedure TBZCustomBufferedStream.WriteSingle(Const Value: Single);
Var
ts: Byte;
Begin
ts := SizeOf(Single);
If (BufferSize>0) and ((BytesInBuf+ts) > pred(BufferSize)) Then Save;
If Not (Assigned(Buffer)) Then SetSize(BufferDefaultSize);
PSingle(Buffer + BufferPosition)^ := value;
Inc(BufferPosition,ts);
Inc(BytesInBuf,ts);
End;
Function TBZCustomBufferedStream.ReadDouble: Double;
Var
ts: Byte;
Begin
If (BufferBytesLeft < 8) Then
Begin
flush;
loadbuffer;
End;
Result := PDouble(Buffer + BufferPosition)^;
ts := SizeOf(Double);
Inc(BufferPosition, ts);
Inc(BufferBytesRead, ts);
Dec(BufferBytesLeft, ts);
End;
Procedure TBZCustomBufferedStream.WriteDouble(Const Value: Double);
Var
ts: Byte;
Begin
ts := SizeOf(Double);
If (BufferSize>0) and ((BytesInBuf+ts) > pred(BufferSize)) Then Save;
If Not (Assigned(Buffer)) Then SetSize(BufferDefaultSize);
PDouble(Buffer + BufferPosition)^ := value;
Inc(BufferPosition,ts);
Inc(BytesInBuf,ts);
End;
Function TBZCustomBufferedStream.ReadChar: Char;
Begin
If (BufferBytesLeft < 1) Then
Begin
flush;
loadbuffer;
End;
Result := PChar(Buffer + BufferPosition)^;
Inc(BufferPosition);
Inc(BufferBytesRead);
Dec(BufferBytesLeft);
End;
Procedure TBZCustomBufferedStream.WriteChar(Const Value: Char);
Begin
If (BufferSize>0) and ((BytesInBuf+1) > pred(BufferSize)) Then Save;
If Not (Assigned(Buffer)) Then SetSize(BufferDefaultSize);
PChar(Buffer + BufferPosition)^ := value;
Inc(BufferPosition);
Inc(BytesInBuf);
End;
Function TBZCustomBufferedStream.ReadNextChar: Char;
Begin
If (BufferBytesLeft < 1) Then
Begin
flush;
loadbuffer;
End;
Result := PChar(Buffer + BufferPosition)^;
End;
Procedure TBZCustomBufferedStream.GotoNextStringLine;
Var
c: Char;
sLineEnding: String;
Begin
sLineEnding := #13#10;
C := ReadChar;
While ((BufferPosition < BufferSize) And Not (pos(C, sLineEnding) > 0)) Do
Begin
C := ReadChar;
End;
If (C = #13) Then ReadChar; //or (C=#10)
End;
Function TBZCustomBufferedStream.ReadLnString: String;
Var
C1, C2: Char;
Stop: Boolean;
S: String;
Begin
If (BufferBytesLeft <= 0) Then
Begin
flush;
loadbuffer;
End;
S := '';
Stop := False;
While Not (Stop) And (BufferPosition <= BufferSize - 1) Do
Begin
C1 := ReadChar;
If (C1 = #13) Or (C1 = #10) Then
Begin
Stop := True;
C2 := ReadChar;
If (C2 In [#32..#255]) Then
Begin
Dec(BufferPosition);
Dec(BufferBytesRead);
Inc(BufferBytesLeft);
End;
// S:=S+C1;
End
Else
Begin
If (C1 = #9) Or (C1 = #32) Or (C1 In [#32..#255]) Then
S := S + C1;
End;
End;
Result := S;
End;
Function TBZCustomBufferedStream.ReadString(len: Integer): String;
Var
S: String;
TmpBuffer: PByte;
Begin
//GlobalLogger.LogNotice('ReadString At : '+IntToStr(GetPosition));
If (BufferBytesLeft < Len) Then
Begin
flush;
loadbuffer;
End;
Result := '';
S := '';
SetLength(S, Len);
Move(PChar(Buffer + BufferPosition)^, S[1], Len);
TmpBuffer := Pointer(S) + Len;
TmpBuffer^ := 0;
Result := S;
Len:=Len-1;
Inc(BufferPosition, Len);
Inc(BufferBytesRead, Len);
Dec(BufferBytesLeft, Len);
End;
Function TBZCustomBufferedStream.ReadString: String;
Var
Len: Integer;
TmpBuffer: PByte;
Begin
Len := ReadInteger;
SetLength(Result, Len);
Read(Pointer(Result), Len);
TmpBuffer := Pointer(Result) + Len;
TmpBuffer^ := 0;
End;
Procedure TBZCustomBufferedStream.SkipChar(Const CharsDelim: String = DefaultCharsDelims);
Var
c: Char;
Begin
C := ReadChar;
While ((BufferPosition < BufferSize) And (pos(C, CharsDelim) > 0)) Do
Begin
C := ReadChar;
End;
Dec(BufferPosition);
Dec(BufferBytesRead);
Inc(BufferBytesLeft);
End;
Function TBZCustomBufferedStream.ReadStrToken(Const CharsDelim: String = DefaultCharsDelims): String;
Var
LastC: Char;
Begin
Result := '';
SkipChar(CharsDelim);
LastC := ReadChar;
While ((BufferPosition < BufferSize) And Not (pos(LastC, CharsDelim) > 0)) Do
Begin
SetLength(Result, Length(Result) + 1);
Result[Length(Result)] := LastC;
LastC := ReadChar;
End;
End;
Function TBZCustomBufferedStream.ReadStrIntToken: Integer;
Var
LastC: Char;
S: String;
Begin
Result := -1;
S := '';
SkipChar(DefaultCharsDelims);
LastC := ReadChar;
While ((BufferPosition < BufferSize) And (pos(LastC, '0123456789') > 0)) Do
Begin
SetLength(S, Length(S) + 1);
S[Length(S)] := LastC;
LastC := ReadChar;
End;
If s <> '' Then
Begin
Result := StrToInt(S);
GotoPreviousByte;
End;
End;
Procedure TBZCustomBufferedStream.Clear;
Begin
FillByte(PByte(Buffer)^, BufferSize, 0);
End;
Function TBZCustomBufferedStream.GetBuffer: Pointer;
Begin
Result := Buffer;
End;
Function TBZCustomBufferedStream.GetBufferAsString: String;
Var
S: String;
Begin
If (BufferBytesLeft <= 0) Then
Begin
flush;
loadbuffer;
End;
SetLength(S, BufferSize);
Move(PChar(Buffer)^, S[1], BufferSize);
Result := S;
End;
Function TBZCustomBufferedStream.EOS: Boolean;
Begin
Result := False;
If ((StreamBytesLeft <= 0) And (BufferBytesLeft <= 0)) Then Result := True;
//if result then GlobalLogger.LogWarning('EOS');
//result:= GetStreamPosition>=StreamSize;
End; |
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