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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 Memory.Block;
interface
uses
Byte,
Byte.Block,
Integer._32.Interval,
Integer._32.Positive,
Integer._64.Positive,
Stream.Input,
Stream.Output,
Text;
type
TMemoryBlock = class(TByteBlock)
protected
function GetAddress(): PByte; virtual; abstract;
function GetSize(): TPositiveInteger32; virtual; abstract;
procedure SetSize(const Value: TPositiveInteger32); virtual; abstract;
public
procedure AssignFrom(Block: TByteBlock); override;
procedure CopyFrom(Block: TByteBlock); override;
procedure FillContents(Value: TByte; Offset: TPositiveInteger32 = 0);
procedure SetContents(const Contents: array of TByte);
procedure CopyFromAddress(Address: PByte);
function CreateSubblock(const Range: TInteger32Interval): TMemoryBlock;
function Copy(): TMemoryBlock; virtual;
procedure Read(Stream: TInputStream); override;
procedure Write(Stream: TOutputStream); override;
function GetByteCount(): TPositiveInteger64; override;
procedure SetByteCount(const Value: TPositiveInteger64); override;
procedure Clear(); override;
procedure ReadFromOffset(Stream: TInputStream; Offset: TPositiveInteger32);
function CreateInputStream(Offset: TPositiveInteger64 = 0): TInputStream; override;
function CreateOverwriteStream(Offset: TPositiveInteger64 = 0): TOutputStream; override;
function CreateRewriteStream(): TOutputStream; override;
function CreateAppendStream(): TOutputStream; override;
function CreateCircularInputStream(Offset: TPositiveInteger32 = 0): TInputStream;
function CreateCircularOverwriteStream(Offset: TPositiveInteger32 = 0): TOutputStream;
function Offset(Value: TPositiveInteger32): PByte;
function ToByteArray(): TArray<TByte>; override;
function ToText(): TText; override;
property Address: PByte read GetAddress;
property Size: TPositiveInteger32 read GetSize write SetSize;
public
class procedure ApplyXor(Target: TMemoryBlock; Mask: TMemoryBlock);
end;
implementation
uses
Exception,
Exception.NotImplemented,
Integer._32,
Integer._32.Positive.TextFormat,
Integer._64.Positive.TextFormat,
Integer._8.Positive,
Memory.Block.Stream.Input,
Memory.Block.Stream.Input.Circular,
Memory.Block.Stream.Output.Append,
Memory.Block.Stream.Output.Overwrite,
Memory.Block.Stream.Output.Overwrite.Circular,
Memory.Block.Subblock;
{ TMemoryBlock }
class procedure TMemoryBlock.ApplyXor(Target: TMemoryBlock; Mask: TMemoryBlock);
var
Target8: PPositiveInteger8;
Mask8: PPositiveInteger8;
Target32: PPositiveInteger32;
Mask32: PPositiveInteger32;
i: TInteger32;
begin
if Target.Size = Mask.Size then
begin
Target32 := PPositiveInteger32(Target.Address);
Mask32 := PPositiveInteger32(Mask.Address);
for i := 1 to Target.Size div SizeOf(TPositiveInteger32) do
begin
Target32^ := Target32^ xor Mask32^;
Inc(Target32);
Inc(Mask32);
end;
Target8 := PPositiveInteger8(Target32);
Mask8 := PPositiveInteger8(Mask32);
for i := 1 to Target.Size mod SizeOf(TPositiveInteger32) do
begin
Target8^ := Target8^ xor Mask8^;
Inc(Target8);
Inc(Mask8);
end;
end
else
raise EException.Create('Block sizes should match');
end;
procedure TMemoryBlock.AssignFrom(Block: TByteBlock);
begin
Size := Block.GetByteCount();
CopyFrom(Block);
end;
procedure TMemoryBlock.Clear();
begin
Size := 0;
end;
function TMemoryBlock.Copy(): TMemoryBlock;
begin
raise ENotSupported.Create(ClassType, 'Copy');
end;
procedure TMemoryBlock.CopyFrom(Block: TByteBlock);
begin
if Block is TMemoryBlock then
CopyFromAddress((Block as TMemoryBlock).Address)
else
inherited CopyFrom(Block);
end;
procedure TMemoryBlock.CopyFromAddress(Address: PByte);
begin
Move(Address^, Self.Address^, Size);
end;
function TMemoryBlock.CreateAppendStream(): TOutputStream;
begin
Result := TMemoryAppendStream.Create(Self);
end;
function TMemoryBlock.CreateCircularInputStream(Offset: TPositiveInteger32): TInputStream;
begin
Result := TMemoryCircularInputStream.Create(Self, Offset);
end;
function TMemoryBlock.CreateCircularOverwriteStream(Offset: TPositiveInteger32): TOutputStream;
begin
Result := TMemoryCircularOverwriteStream.Create(Self, Offset);
end;
function TMemoryBlock.CreateInputStream(Offset: TPositiveInteger64): TInputStream;
begin
if Offset <= Size then
Result := TMemoryInputStream.Create(Self, Offset)
else
raise EException.Create('Illegal offset: ' + PositiveInteger64ToText(Offset));
end;
function TMemoryBlock.CreateOverwriteStream(Offset: TPositiveInteger64): TOutputStream;
begin
if Offset <= Size then
Result := TMemoryOverwriteStream.Create(Self, Offset)
else
raise EException.Create('Illegal offset: ' + PositiveInteger64ToText(Offset));
end;
function TMemoryBlock.CreateRewriteStream(): TOutputStream;
begin
Size := 0;
Result := CreateAppendStream();
end;
function TMemoryBlock.CreateSubblock(const Range: TInteger32Interval): TMemoryBlock;
begin
if (Range.Low >= 0) and (Range.High < Size) then
Result := TMemorySubblock.Create(Self, Range)
else
raise EException.Create('Illegal range: ' + Range.ToText());
end;
procedure TMemoryBlock.FillContents(Value: TByte; Offset: TPositiveInteger32);
var
Start: PByte;
begin
Start := Address;
Inc(Start, Offset);
FillChar(Start^, Size - Offset, Value);
end;
function TMemoryBlock.Offset(Value: TPositiveInteger32): PByte;
begin
if Value < Size then
begin
Result := Address;
Inc(Result, Value);
end
else
raise EException.Create('Illegal offset: ' + PositiveInteger32ToText(Value));
end;
procedure TMemoryBlock.Read(Stream: TInputStream);
begin
Stream.Read(Address^, Size);
end;
procedure TMemoryBlock.ReadFromOffset(Stream: TInputStream; Offset: TPositiveInteger32);
var
Target: PByte;
begin
Target := Address;
Inc(Target, Offset);
Stream.Read(Target^, Size - Offset);
end;
procedure TMemoryBlock.SetByteCount(const Value: TPositiveInteger64);
begin
Size := Value;
end;
procedure TMemoryBlock.SetContents(const Contents: array of TByte);
begin
Size := Length(Contents);
if Size > 0 then
Move(Contents[0], Address^, Size);
end;
function TMemoryBlock.ToByteArray(): TArray<TByte>;
begin
SetLength(Result, Size);
if Size > 0 then
Move(Address^, Result[0], Size);
end;
function TMemoryBlock.ToText(): TText;
begin
Result := '#Bytes: ' + PositiveInteger32ToText(Size);
end;
function TMemoryBlock.GetByteCount(): TPositiveInteger64;
begin
Result := Size;
end;
procedure TMemoryBlock.Write(Stream: TOutputStream);
begin
Stream.Write(Address^, Size);
end;
end.
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