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HostsCacheBinaryTrees.pas
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// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
unit
HostsCacheBinaryTrees;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
interface
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
uses
IPUtils,
MD5,
MemoryStore;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
PHostsCacheIPv4AddressBinaryTreeItem = ^THostsCacheIPv4AddressBinaryTreeItem;
THostsCacheIPv4AddressBinaryTreeItem = packed record
Hash : TMD5Digest;
Data : TIPv4Address;
L : PHostsCacheIPv4AddressBinaryTreeItem;
R : PHostsCacheIPv4AddressBinaryTreeItem;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
THostsCacheIPv4AddressBinaryTree = class
private
MemoryStore: TType1MemoryStore;
private
BinaryTreeRoot: PHostsCacheIPv4AddressBinaryTreeItem;
public
constructor Create(MemoryStore: TType1MemoryStore);
procedure AddItem(Name: String; Data: TIPv4Address);
function FindItem(Name: String; var Data: TIPv4Address): Boolean;
destructor Destroy; override;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
PHostsCacheIPv6AddressBinaryTreeItem = ^THostsCacheIPv6AddressBinaryTreeItem;
THostsCacheIPv6AddressBinaryTreeItem = packed record
Hash : TMD5Digest;
Data : PIPv6Address;
L : PHostsCacheIPv6AddressBinaryTreeItem;
R : PHostsCacheIPv6AddressBinaryTreeItem;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
THostsCacheIPv6AddressBinaryTree = class
private
MemoryStore: TType1MemoryStore;
private
BinaryTreeRoot: PHostsCacheIPv6AddressBinaryTreeItem;
public
constructor Create(MemoryStore: TType1MemoryStore);
procedure AddItem(Name: String; Data: PIPv6Address);
function FindItem(Name: String; var Data: PIPv6Address): Boolean;
destructor Destroy; override;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
PHostsCacheNameOnlyBinaryTreeItem = ^THostsCacheNameOnlyBinaryTreeItem;
THostsCacheNameOnlyBinaryTreeItem = packed record
Hash : TMD5Digest;
L : PHostsCacheNameOnlyBinaryTreeItem;
R : PHostsCacheNameOnlyBinaryTreeItem;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
THostsCacheNameOnlyBinaryTree = class
private
MemoryStore: TType1MemoryStore;
private
BinaryTreeRoot: PHostsCacheNameOnlyBinaryTreeItem;
public
constructor Create(MemoryStore: TType1MemoryStore);
procedure AddItem(Name: String);
function FindItem(Name: String): Boolean;
destructor Destroy; override;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
implementation
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
uses
SysUtils;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
constructor THostsCacheIPv4AddressBinaryTree.Create(MemoryStore: TType1MemoryStore);
begin
inherited Create;
Self.BinaryTreeRoot := nil;
Self.MemoryStore := MemoryStore;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure THostsCacheIPv4AddressBinaryTree.AddItem(Name: String; Data: TIPv4Address);
var
Hash: TMD5Digest; BinaryTreeItem: PHostsCacheIPv4AddressBinaryTreeItem; CompareResult: Integer;
begin
Hash := TMD5.Compute(@((LowerCase(Name))[1]), Length(Name));
if (Self.BinaryTreeRoot <> nil) then begin
BinaryTreeItem := Self.BinaryTreeRoot; while True do begin
CompareResult := TMD5.Compare(Hash, BinaryTreeItem^.Hash);
if (CompareResult > 0) then begin
if (BinaryTreeItem^.R = nil) then begin
BinaryTreeItem^.R := Self.MemoryStore.GetMemory(SizeOf(THostsCacheIPv4AddressBinaryTreeItem)); BinaryTreeItem^.R^.Hash := Hash; BinaryTreeItem^.R^.Data := Data; BinaryTreeItem^.R^.L := nil; BinaryTreeItem^.R^.R := nil; Exit;
end else begin
BinaryTreeItem := BinaryTreeItem^.R;
end;
end else if (CompareResult < 0) then begin
if (BinaryTreeItem^.L = nil) then begin
BinaryTreeItem^.L := Self.MemoryStore.GetMemory(SizeOf(THostsCacheIPv4AddressBinaryTreeItem)); BinaryTreeItem^.L^.Hash := Hash; BinaryTreeItem^.L^.Data := Data; BinaryTreeItem^.L^.L := nil; BinaryTreeItem^.L^.R := nil; Exit;
end else begin
BinaryTreeItem := BinaryTreeItem^.L;
end;
end else begin
Exit;
end;
end;
end else begin
Self.BinaryTreeRoot := Self.MemoryStore.GetMemory(SizeOf(THostsCacheIPv4AddressBinaryTreeItem)); Self.BinaryTreeRoot^.Hash := Hash; Self.BinaryTreeRoot^.Data := Data; Self.BinaryTreeRoot^.L := nil; Self.BinaryTreeRoot^.R := nil;
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function THostsCacheIPv4AddressBinaryTree.FindItem(Name: String; var Data: TIPv4Address): Boolean;
var
Hash: TMD5Digest; BinaryTreeItem: PHostsCacheIPv4AddressBinaryTreeItem; CompareResult: Integer;
begin
Result := False;
if (Self.BinaryTreeRoot <> nil) then begin
Hash := TMD5.Compute(@((LowerCase(Name))[1]), Length(Name));
BinaryTreeItem := Self.BinaryTreeRoot; while True do begin
CompareResult := TMD5.Compare(Hash, BinaryTreeItem^.Hash);
if (CompareResult > 0) then begin
if (BinaryTreeItem^.R <> nil) then begin
BinaryTreeItem := BinaryTreeItem^.R;
end else begin
Exit;
end;
end else if (CompareResult < 0) then begin
if (BinaryTreeItem^.L <> nil) then begin
BinaryTreeItem := BinaryTreeItem^.L;
end else begin
Exit;
end;
end else begin
Data := BinaryTreeItem^.Data; Result := True; Exit;
end;
end;
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
destructor THostsCacheIPv4AddressBinaryTree.Destroy;
begin
inherited Destroy;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
constructor THostsCacheIPv6AddressBinaryTree.Create(MemoryStore: TType1MemoryStore);
begin
inherited Create;
Self.BinaryTreeRoot := nil;
Self.MemoryStore := MemoryStore;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure THostsCacheIPv6AddressBinaryTree.AddItem(Name: String; Data: PIPv6Address);
var
Hash: TMD5Digest; BinaryTreeItem: PHostsCacheIPv6AddressBinaryTreeItem; CompareResult: Integer;
begin
Hash := TMD5.Compute(@((LowerCase(Name))[1]), Length(Name));
if (Self.BinaryTreeRoot <> nil) then begin
BinaryTreeItem := Self.BinaryTreeRoot; while True do begin
CompareResult := TMD5.Compare(Hash, BinaryTreeItem^.Hash);
if (CompareResult > 0) then begin
if (BinaryTreeItem^.R = nil) then begin
BinaryTreeItem^.R := Self.MemoryStore.GetMemory(SizeOf(THostsCacheIPv6AddressBinaryTreeItem)); BinaryTreeItem^.R^.Hash := Hash; BinaryTreeItem^.R^.Data := Data; BinaryTreeItem^.R^.L := nil; BinaryTreeItem^.R^.R := nil; Exit;
end else begin
BinaryTreeItem := BinaryTreeItem^.R;
end;
end else if (CompareResult < 0) then begin
if (BinaryTreeItem^.L = nil) then begin
BinaryTreeItem^.L := Self.MemoryStore.GetMemory(SizeOf(THostsCacheIPv6AddressBinaryTreeItem)); BinaryTreeItem^.L^.Hash := Hash; BinaryTreeItem^.L^.Data := Data; BinaryTreeItem^.L^.L := nil; BinaryTreeItem^.L^.R := nil; Exit;
end else begin
BinaryTreeItem := BinaryTreeItem^.L;
end;
end else begin
Exit;
end;
end;
end else begin
Self.BinaryTreeRoot := Self.MemoryStore.GetMemory(SizeOf(THostsCacheIPv6AddressBinaryTreeItem)); Self.BinaryTreeRoot^.Hash := Hash; Self.BinaryTreeRoot^.Data := Data; Self.BinaryTreeRoot^.L := nil; Self.BinaryTreeRoot^.R := nil;
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function THostsCacheIPv6AddressBinaryTree.FindItem(Name: String; var Data: PIPv6Address): Boolean;
var
Hash: TMD5Digest; BinaryTreeItem: PHostsCacheIPv6AddressBinaryTreeItem; CompareResult: Integer;
begin
Result := False;
if (Self.BinaryTreeRoot <> nil) then begin
Hash := TMD5.Compute(@((LowerCase(Name))[1]), Length(Name));
BinaryTreeItem := Self.BinaryTreeRoot; while True do begin
CompareResult := TMD5.Compare(Hash, BinaryTreeItem^.Hash);
if (CompareResult > 0) then begin
if (BinaryTreeItem^.R <> nil) then begin
BinaryTreeItem := BinaryTreeItem^.R;
end else begin
Exit;
end;
end else if (CompareResult < 0) then begin
if (BinaryTreeItem^.L <> nil) then begin
BinaryTreeItem := BinaryTreeItem^.L;
end else begin
Exit;
end;
end else begin
Data := BinaryTreeItem^.Data; Result := True; Exit;
end;
end;
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
destructor THostsCacheIPv6AddressBinaryTree.Destroy;
begin
inherited Destroy;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
constructor THostsCacheNameOnlyBinaryTree.Create(MemoryStore: TType1MemoryStore);
begin
inherited Create;
Self.BinaryTreeRoot := nil;
Self.MemoryStore := MemoryStore;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure THostsCacheNameOnlyBinaryTree.AddItem(Name: String);
var
Hash: TMD5Digest; BinaryTreeItem: PHostsCacheNameOnlyBinaryTreeItem; CompareResult: Integer;
begin
Hash := TMD5.Compute(@((LowerCase(Name))[1]), Length(Name));
if (Self.BinaryTreeRoot <> nil) then begin
BinaryTreeItem := Self.BinaryTreeRoot; while True do begin
CompareResult := TMD5.Compare(Hash, BinaryTreeItem^.Hash);
if (CompareResult > 0) then begin
if (BinaryTreeItem^.R = nil) then begin
BinaryTreeItem^.R := Self.MemoryStore.GetMemory(SizeOf(THostsCacheNameOnlyBinaryTreeItem)); BinaryTreeItem^.R^.Hash := Hash; BinaryTreeItem^.R^.L := nil; BinaryTreeItem^.R^.R := nil; Exit;
end else begin
BinaryTreeItem := BinaryTreeItem^.R;
end;
end else if (CompareResult < 0) then begin
if (BinaryTreeItem^.L = nil) then begin
BinaryTreeItem^.L := Self.MemoryStore.GetMemory(SizeOf(THostsCacheNameOnlyBinaryTreeItem)); BinaryTreeItem^.L^.Hash := Hash; BinaryTreeItem^.L^.L := nil; BinaryTreeItem^.L^.R := nil; Exit;
end else begin
BinaryTreeItem := BinaryTreeItem^.L;
end;
end else begin
Exit;
end;
end;
end else begin
Self.BinaryTreeRoot := Self.MemoryStore.GetMemory(SizeOf(THostsCacheNameOnlyBinaryTreeItem)); Self.BinaryTreeRoot^.Hash := Hash; Self.BinaryTreeRoot^.L := nil; Self.BinaryTreeRoot^.R := nil;
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function THostsCacheNameOnlyBinaryTree.FindItem(Name: String): Boolean;
var
Hash: TMD5Digest; BinaryTreeItem: PHostsCacheNameOnlyBinaryTreeItem; CompareResult: Integer;
begin
Result := False;
if (Self.BinaryTreeRoot <> nil) then begin
Hash := TMD5.Compute(@((LowerCase(Name))[1]), Length(Name));
BinaryTreeItem := Self.BinaryTreeRoot; while True do begin
CompareResult := TMD5.Compare(Hash, BinaryTreeItem^.Hash);
if (CompareResult > 0) then begin
if (BinaryTreeItem^.R <> nil) then begin
BinaryTreeItem := BinaryTreeItem^.R;
end else begin
Exit;
end;
end else if (CompareResult < 0) then begin
if (BinaryTreeItem^.L <> nil) then begin
BinaryTreeItem := BinaryTreeItem^.L;
end else begin
Exit;
end;
end else begin
Result := True; Exit;
end;
end;
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
destructor THostsCacheNameOnlyBinaryTree.Destroy;
begin
inherited Destroy;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
end.