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| ///////////////////////////////////////////////////////////////////////////
// //
// Copyright (c) 2015 by Charta Software B.V. //
// All rights reserved //
// //
// Version: 1.7.0.83525 //
// Web site: https://pascal.chartasoftware.com/ //
// //
// This code and information are provided "as is" without warranty of //
// any kind. Dissemination of this information or reproduction of //
// this material is strictly forbidden unless prior written permission //
// is obtained from Charta Software B.V.. //
// //
///////////////////////////////////////////////////////////////////////////
unit Byte.Block;
interface
uses
Boolean,
Byte,
Integer._64.Positive,
Mathematics.Sign,
Stream.Input,
Stream.Output,
Stream.SerializableObject;
type
TByteBlock = class(TSerializableObject)
public
procedure Read(Stream: TInputStream); override;
procedure Write(Stream: TOutputStream); override;
function GetByteCount(): TPositiveInteger64; virtual; abstract;
procedure SetByteCount(const Value: TPositiveInteger64); virtual; abstract;
function CreateInputStream(Offset: TPositiveInteger64 = 0): TInputStream; virtual; abstract;
function CreateOverwriteStream(Offset: TPositiveInteger64 = 0): TOutputStream; virtual; abstract;
function CreateRewriteStream(): TOutputStream; virtual; abstract;
function CreateAppendStream(): TOutputStream; virtual; abstract;
procedure Clear(); virtual;
procedure Append(Stream: TInputStream); virtual;
procedure AssignFrom(Block: TByteBlock); virtual;
procedure CopyFrom(Block: TByteBlock); virtual;
procedure ReadFromObject(SerializableObject: TSerializableObject);
procedure WriteToObject(SerializableObject: TSerializableObject);
function Equal(Block: TByteBlock): TBoolean; virtual;
function ToByteArray(): TArray<TByte>; virtual;
public
class function Compare(Left: TByteBlock; Right: TByteBlock): TSign;
end;
implementation
uses
Exception.NotImplemented,
Integer._32,
Integer._32.Positive,
Mathematics,
Stream;
{ TByteBlock }
procedure TByteBlock.Append(Stream: TInputStream);
var
Output: TOutputStream;
begin
Output := CreateAppendStream();
while not Stream.AtEnd() do
CopyStream(Stream, Output, Stream.Available());
Output.Free();
end;
procedure TByteBlock.AssignFrom(Block: TByteBlock);
begin
raise ENotImplemented.Create(ClassType, 'AssignFrom');
end;
procedure TByteBlock.Clear();
begin
raise ENotImplemented.Create(ClassType, 'Clear');
end;
class function TByteBlock.Compare(Left: TByteBlock; Right: TByteBlock): TSign;
var
LeftStream: TInputStream;
RightStream: TInputStream;
LeftSize: TPositiveInteger64;
RightSize: TPositiveInteger64;
BytesToRead: TInteger32;
BufferLeft: array [0..1023] of TByte;
BufferRight: array [0..1023] of TByte;
BufferSize: TInteger32;
Count: TPositiveInteger64;
i: TInteger32;
begin
LeftStream := Left.CreateInputStream();
RightStream := Right.CreateInputStream();
LeftSize := Left.GetByteCount();
RightSize := Right.GetByteCount();
Result := sZero;
Count := Minimum(LeftSize, RightSize);
BufferSize := Length(BufferLeft);
while (Result = sZero) and (Count > 0) do
begin
BytesToRead := Minimum(Count, BufferSize);
LeftStream.Read(BufferLeft, BytesToRead);
RightStream.Read(BufferRight, BytesToRead);
i := 0;
while (Result = sZero) and (i < BytesToRead) do
begin
if BufferLeft[i] > BufferRight[i] then
Result := sPositive
else if BufferLeft[i] < BufferRight[i] then
Result := sNegative;
Inc(i);
end;
Dec(Count, BytesToRead);
end;
if (Result = sZero) and (LeftSize <> RightSize) then
begin
if LeftSize > RightSize then
Result := sPositive
else
Result := sNegative;
end;
LeftStream.Free();
RightStream.Free();
end;
procedure TByteBlock.CopyFrom(Block: TByteBlock);
var
Stream: TInputStream;
begin
Stream := Block.CreateInputStream();
try
Read(Stream);
finally
Stream.Free();
end;
end;
function TByteBlock.Equal(Block: TByteBlock): TBoolean;
begin
Result := Compare(Self, Block) = sZero;
end;
procedure TByteBlock.Read(Stream: TInputStream);
begin
raise ENotImplemented.Create(ClassType, 'Read');
end;
procedure TByteBlock.ReadFromObject(SerializableObject: TSerializableObject);
var
Stream: TOutputStream;
begin
Stream := CreateAppendStream();
SerializableObject.Write(Stream);
Stream.Free();
end;
function TByteBlock.ToByteArray(): TArray<TByte>;
var
Stream: TInputStream;
ByteCount: TPositiveInteger32;
begin
ByteCount := GetByteCount();
SetLength(Result, ByteCount);
if ByteCount > 0 then
begin
Stream := CreateInputStream();
Stream.Read(Result[0], ByteCount);
Stream.Free();
end;
end;
procedure TByteBlock.Write(Stream: TOutputStream);
var
Input: TInputStream;
begin
Input := CreateInputStream();
CopyStream(Input, Stream, GetByteCount());
Input.Free();
end;
procedure TByteBlock.WriteToObject(SerializableObject: TSerializableObject);
var
Stream: TInputStream;
begin
Stream := CreateInputStream();
SerializableObject.Read(Stream);
Stream.Free();
end;
end.
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