413 lines
13 KiB
ObjectPascal
413 lines
13 KiB
ObjectPascal
unit PrecompLZ4;
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interface
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uses
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LZ4DLL, XDeltaDLL,
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Utils,
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PrecompUtils,
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System.SysUtils, System.StrUtils, System.Classes, System.Math;
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var
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Codec: TPrecompressor;
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implementation
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const
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LZ4Codecs: array of PChar = ['lz4', 'lz4hc', 'lz4f'];
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CODEC_COUNT = 3;
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LZ4_CODEC = 0;
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LZ4HC_CODEC = 1;
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LZ4F_CODEC = 2;
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const
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L_MAXSIZE = 16 * 1024 * 1024;
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L_BLOCKSIZE = 0;
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L_BLOCKDEPENDENCY = 0;
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var
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SOList: array of array [0 .. CODEC_COUNT - 1] of TSOList;
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CodecAvailable, CodecEnabled: TArray<Boolean>;
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LBlockSize: Integer = L_BLOCKSIZE;
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LBlockDependency: Integer = L_BLOCKDEPENDENCY;
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function LZ4Init(Command: PChar; Count: Integer; Funcs: PPrecompFuncs): Boolean;
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var
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I: Integer;
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Options: TArray<Integer>;
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S: String;
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X, Y: Integer;
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begin
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Result := True;
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SetLength(SOList, Count);
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for X := Low(SOList) to High(SOList) do
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for Y := Low(SOList[X]) to High(SOList[X]) do
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SOList[X, Y] := TSOList.Create([], TSOMethod.MTF);
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for X := Low(CodecAvailable) to High(CodecAvailable) do
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begin
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CodecAvailable[X] := False;
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CodecEnabled[X] := False;
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end;
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for X := Low(CodecAvailable) to High(CodecAvailable) do
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CodecAvailable[X] := LZ4DLL.DLLLoaded;
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X := 0;
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while Funcs^.GetCodec(Command, X, False) <> '' do
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begin
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S := Funcs^.GetCodec(Command, X, False);
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if (CompareText(S, LZ4Codecs[LZ4_CODEC]) = 0) and LZ4DLL.DLLLoaded then
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begin
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CodecEnabled[LZ4_CODEC] := True;
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end
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else if (CompareText(S, LZ4Codecs[LZ4HC_CODEC]) = 0) and LZ4DLL.DLLLoaded
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then
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begin
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CodecEnabled[LZ4HC_CODEC] := True;
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if Funcs^.GetParam(Command, X, 'l') <> '' then
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for I := Low(SOList) to High(SOList) do
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SOList[I][LZ4HC_CODEC].Update
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([StrToInt(Funcs^.GetParam(Command, X, 'l'))], True);
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end
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else if (CompareText(S, LZ4Codecs[LZ4F_CODEC]) = 0) and LZ4DLL.DLLLoaded
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then
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begin
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CodecEnabled[LZ4F_CODEC] := True;
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if Funcs^.GetParam(Command, X, 'l') <> '' then
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for I := Low(SOList) to High(SOList) do
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SOList[I][LZ4F_CODEC].Update
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([StrToInt(Funcs^.GetParam(Command, X, 'l'))], True);
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if Funcs^.GetParam(Command, X, 'b') <> '' then
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LBlockSize := StrToInt(Funcs^.GetParam(Command, X, 'b')) - 4;
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if Funcs^.GetParam(Command, X, 'd') <> '' then
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LBlockDependency := StrToInt(Funcs^.GetParam(Command, X, 'd'));
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end;
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Inc(X);
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end;
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for X := Low(SOList) to High(SOList) do
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if SOList[X, LZ4_CODEC].Count = 0 then
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SOList[X, LZ4_CODEC].Update([1]);
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SetLength(Options, 0);
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for I := 3 to 12 do
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Insert(I, Options, Length(Options));
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for X := Low(SOList) to High(SOList) do
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if SOList[X, LZ4HC_CODEC].Count = 0 then
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SOList[X, LZ4HC_CODEC].Update(Options);
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SetLength(Options, 0);
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for I := 2 to 12 do
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Insert(I, Options, Length(Options));
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for X := Low(SOList) to High(SOList) do
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if SOList[X, LZ4F_CODEC].Count = 0 then
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SOList[X, LZ4F_CODEC].Update(Options);
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end;
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procedure LZ4Free(Funcs: PPrecompFuncs);
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var
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X, Y: Integer;
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begin
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for X := Low(SOList) to High(SOList) do
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for Y := Low(SOList[X]) to High(SOList[X]) do
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SOList[X, Y].Free;
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end;
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function LZ4Parse(Command: PChar; Option: PInteger;
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Funcs: PPrecompFuncs): Boolean;
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var
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S: String;
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I: Integer;
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begin
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Result := False;
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Option^ := 0;
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SetBits(Option^, LBlockSize, 12, 2);
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SetBits(Option^, LBlockDependency, 14, 1);
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I := 0;
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while Funcs^.GetCodec(Command, I, False) <> '' do
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begin
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S := Funcs^.GetCodec(Command, I, False);
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if (CompareText(S, LZ4Codecs[LZ4_CODEC]) = 0) and LZ4DLL.DLLLoaded then
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begin
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SetBits(Option^, 0, 0, 5);
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Result := True;
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end
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else if (CompareText(S, LZ4Codecs[LZ4HC_CODEC]) = 0) and LZ4DLL.DLLLoaded
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then
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begin
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SetBits(Option^, 1, 0, 5);
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if Funcs^.GetParam(Command, I, 'l') <> '' then
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SetBits(Option^, StrToInt(Funcs^.GetParam(Command, I, 'l')), 5, 7);
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Result := True;
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end
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else if (CompareText(S, LZ4Codecs[LZ4F_CODEC]) = 0) and LZ4DLL.DLLLoaded
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then
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begin
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SetBits(Option^, 2, 0, 5);
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if Funcs^.GetParam(Command, I, 'l') <> '' then
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SetBits(Option^, StrToInt(Funcs^.GetParam(Command, I, 'l')), 5, 7);
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if Funcs^.GetParam(Command, I, 'b') <> '' then
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SetBits(Option^, StrToInt(Funcs^.GetParam(Command, I, 'b')) - 4, 12, 2);
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if Funcs^.GetParam(Command, I, 'd') <> '' then
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SetBits(Option^, StrToInt(Funcs^.GetParam(Command, I, 'd')), 14, 1);
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Result := True;
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end;
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Inc(I);
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end;
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end;
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procedure LZ4Scan1(Instance, Depth: Integer; Input: PByte;
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Size, SizeEx: NativeInt; Output: _PrecompOutput; Add: _PrecompAdd;
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Funcs: PPrecompFuncs);
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var
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Buffer: PByte;
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X, Y: Integer;
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SI: _StrInfo1;
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DI1, DI2: TDepthInfo;
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DS: TPrecompStr;
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begin
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DI1 := Funcs^.GetDepthInfo(Instance);
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DS := Funcs^.GetCodec(DI1.Codec, 0, False);
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if DS <> '' then
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begin
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X := IndexTextW(@DS[0], LZ4Codecs);
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if (X < 0) or (DI1.OldSize <> SizeEx) then
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exit;
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if not CodecAvailable[X] then
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exit;
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Y := Max(DI1.NewSize, L_MAXSIZE);
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Buffer := Funcs^.Allocator(Instance, Y);
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case X of
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LZ4_CODEC, LZ4HC_CODEC:
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Y := LZ4_decompress_safe(Input, Buffer, DI1.OldSize, Y);
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LZ4F_CODEC:
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Y := LZ4F_decompress_safe(Input, Buffer, DI1.OldSize, Y);
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end;
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if (Y > DI1.OldSize) then
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begin
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Output(Instance, Buffer, Y);
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SI.Position := 0;
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SI.OldSize := DI1.OldSize;
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SI.NewSize := Y;
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SI.Option := 0;
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SetBits(SI.Option, X, 0, 5);
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SetBits(SI.Option, LBlockSize, 12, 2);
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SetBits(SI.Option, LBlockDependency, 14, 1);
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if System.Pos(SPrecompSep2, DI1.Codec) > 0 then
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SI.Status := TStreamStatus.Predicted
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else
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SI.Status := TStreamStatus.None;
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DS := Funcs^.GetDepthCodec(DI1.Codec);
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Move(DS[0], DI2.Codec, SizeOf(DI2.Codec));
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DI2.OldSize := SI.NewSize;
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DI2.NewSize := SI.NewSize;
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Funcs^.LogScan1(LZ4Codecs[GetBits(SI.Option, 0, 5)], SI.Position,
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SI.OldSize, SI.NewSize);
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Add(Instance, @SI, DI1.Codec, @DI2);
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end;
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exit;
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end;
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if BoolArray(CodecEnabled, False) then
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exit;
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end;
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function LZ4Scan2(Instance, Depth: Integer; Input: Pointer; Size: NativeInt;
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StreamInfo: PStrInfo2; Offset: PInteger; Output: _PrecompOutput;
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Funcs: PPrecompFuncs): Boolean;
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var
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Buffer: PByte;
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X: Integer;
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Res: Integer;
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begin
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Result := False;
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X := GetBits(StreamInfo^.Option, 0, 5);
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if StreamInfo^.OldSize <= 0 then
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exit;
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StreamInfo^.NewSize := Max(StreamInfo^.NewSize, L_MAXSIZE);
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Buffer := Funcs^.Allocator(Instance, StreamInfo^.NewSize);
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case X of
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LZ4_CODEC, LZ4HC_CODEC:
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Res := LZ4_decompress_safe(Input, Buffer, StreamInfo^.OldSize,
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StreamInfo^.NewSize);
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LZ4F_CODEC:
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Res := LZ4F_decompress_safe(Input, Buffer, StreamInfo^.OldSize,
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StreamInfo^.NewSize);
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end;
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if Res > StreamInfo^.OldSize then
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begin
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StreamInfo^.NewSize := Res;
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Output(Instance, Buffer, Res);
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Funcs^.LogScan2(LZ4Codecs[GetBits(StreamInfo^.Option, 0, 5)],
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StreamInfo^.OldSize, StreamInfo^.NewSize);
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Result := True;
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end;
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end;
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function LZ4Process(Instance, Depth: Integer; OldInput, NewInput: Pointer;
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StreamInfo: PStrInfo2; Output: _PrecompOutput; Funcs: PPrecompFuncs): Boolean;
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var
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Buffer, Ptr: PByte;
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Params: String;
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I: Integer;
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X, Y: Integer;
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Res1: Integer;
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Res2: NativeUInt;
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LZ4FT: LZ4F_preferences_t;
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begin
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Result := False;
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X := GetBits(StreamInfo^.Option, 0, 5);
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if BoolArray(CodecAvailable, False) or (CodecAvailable[X] = False) then
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exit;
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Y := LZ4F_compressFrameBound(StreamInfo^.NewSize, nil);
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Buffer := Funcs^.Allocator(Instance, Y);
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SOList[Instance][X].Index := 0;
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while SOList[Instance][X].Get(I) >= 0 do
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begin
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if StreamInfo^.Status = TStreamStatus.Predicted then
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if GetBits(StreamInfo^.Option, 5, 7) <> I then
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continue;
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case X of
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LZ4_CODEC:
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begin
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Params := '';
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Res1 := LZ4_compress_default(NewInput, Buffer,
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StreamInfo^.NewSize, Y);
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end;
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LZ4HC_CODEC:
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begin
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Params := 'l' + I.ToString;
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Res1 := LZ4_compress_HC(NewInput, Buffer, StreamInfo^.NewSize, Y, I);
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end;
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LZ4F_CODEC:
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begin
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FillChar(LZ4FT, SizeOf(LZ4F_preferences_t), 0);
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LZ4FT.compressionLevel := I;
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LZ4FT.frameInfo.blockSizeID :=
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LZ4F_blockSizeID_t(GetBits(StreamInfo^.Option, 12, 2) + 4);
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LZ4FT.frameInfo.blockMode :=
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LZ4F_blockMode_t(GetBits(StreamInfo^.Option, 14, 1));
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Params := 'l' + I.ToString + ':' + 'b' +
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(GetBits(StreamInfo^.Option, 12, 2) + 4).ToString + ':' + 'd' +
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GetBits(StreamInfo^.Option, 14, 1).ToString;
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Res1 := LZ4F_compressFrame(Buffer, Y, NewInput,
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StreamInfo^.NewSize, @LZ4FT);
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end;
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end;
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Result := (Res1 = StreamInfo^.OldSize) and CompareMem(OldInput, Buffer,
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StreamInfo^.OldSize);
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Funcs^.LogProcess(LZ4Codecs[GetBits(StreamInfo^.Option, 0, 5)],
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PChar(Params), StreamInfo^.OldSize, StreamInfo^.NewSize, Res1, Result);
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if Result then
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break;
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end;
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if (Result = False) and ((StreamInfo^.Status = TStreamStatus.Predicted) or
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(SOList[Instance][X].Count = 1)) then
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begin
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Buffer := Funcs^.Allocator(Instance, Res1 + Max(StreamInfo^.OldSize, Res1));
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Res2 := PrecompEncodePatch(OldInput, StreamInfo^.OldSize, Buffer, Res1,
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Buffer + Res1, Max(StreamInfo^.OldSize, Res1));
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Funcs^.LogPatch1(StreamInfo^.OldSize, Res1, Res2, (Res2 > 0) and
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((Res2 / Max(StreamInfo^.OldSize, Res1)) <= DIFF_TOLERANCE));
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if (Res2 > 0) and ((Res2 / Max(StreamInfo^.OldSize, Res1)) <= DIFF_TOLERANCE)
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then
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begin
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Output(Instance, Buffer + Res1, Res2);
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SetBits(StreamInfo^.Option, 1, 31, 1);
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SOList[Instance][X].Add(I);
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Result := True;
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end;
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end;
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if Result then
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begin
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SetBits(StreamInfo^.Option, I, 5, 7);
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SOList[Instance][X].Add(I);
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end;
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end;
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function LZ4Restore(Instance, Depth: Integer; Input, InputExt: Pointer;
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StreamInfo: _StrInfo3; Output: _PrecompOutput; Funcs: PPrecompFuncs): Boolean;
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var
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Buffer: PByte;
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Params: String;
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X: Integer;
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Res1: Integer;
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Res2: NativeUInt;
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LZ4FT: LZ4F_preferences_t;
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begin
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Result := False;
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X := GetBits(StreamInfo.Option, 0, 5);
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if BoolArray(CodecAvailable, False) or (CodecAvailable[X] = False) then
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exit;
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Buffer := Funcs^.Allocator(Instance,
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LZ4F_compressFrameBound(StreamInfo.NewSize, nil));
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case X of
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LZ4_CODEC:
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begin
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Params := '';
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Res1 := LZ4_compress_default(Input, Buffer, StreamInfo.NewSize,
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LZ4F_compressFrameBound(StreamInfo.NewSize, nil));
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end;
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LZ4HC_CODEC:
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begin
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Params := 'l' + GetBits(StreamInfo.Option, 5, 7).ToString;
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Res1 := LZ4_compress_HC(Input, Buffer, StreamInfo.NewSize,
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LZ4F_compressFrameBound(StreamInfo.NewSize, nil),
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GetBits(StreamInfo.Option, 5, 7));
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end;
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LZ4F_CODEC:
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begin
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FillChar(LZ4FT, SizeOf(LZ4F_preferences_t), 0);
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LZ4FT.compressionLevel := GetBits(StreamInfo.Option, 5, 7);
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LZ4FT.frameInfo.blockSizeID :=
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LZ4F_blockSizeID_t(GetBits(StreamInfo.Option, 12, 2) + 4);
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LZ4FT.frameInfo.blockMode :=
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LZ4F_blockMode_t(GetBits(StreamInfo.Option, 14, 1));
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Params := 'l' + GetBits(StreamInfo.Option, 5, 7).ToString + ':' + 'b' +
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(GetBits(StreamInfo.Option, 12, 2) + 4).ToString + ':' + 'd' +
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GetBits(StreamInfo.Option, 14, 1).ToString;
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Res1 := LZ4F_compressFrame(Buffer,
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LZ4F_compressFrameBound(StreamInfo.NewSize, nil), Input,
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StreamInfo.NewSize, @LZ4FT);
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end;
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end;
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Funcs^.LogRestore(LZ4Codecs[GetBits(StreamInfo.Option, 0, 5)], PChar(Params),
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StreamInfo.OldSize, StreamInfo.NewSize, Res1, True);
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if GetBits(StreamInfo.Option, 31, 1) = 1 then
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begin
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Buffer := Funcs^.Allocator(Instance, Res1 + StreamInfo.OldSize);
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Res2 := PrecompDecodePatch(InputExt, StreamInfo.ExtSize, Buffer, Res1,
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Buffer + Res1, StreamInfo.OldSize);
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Funcs^.LogPatch2(StreamInfo.OldSize, Res1, StreamInfo.ExtSize, Res2 > 0);
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if Res2 > 0 then
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begin
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Output(Instance, Buffer + Res1, StreamInfo.OldSize);
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Result := True;
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end;
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exit;
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end;
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if Res1 = StreamInfo.OldSize then
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begin
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Output(Instance, Buffer, StreamInfo.OldSize);
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Result := True;
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end;
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end;
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var
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I: Integer;
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initialization
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Codec.Names := [];
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for I := Low(LZ4Codecs) to High(LZ4Codecs) do
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begin
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Codec.Names := Codec.Names + [LZ4Codecs[I]];
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StockMethods.Add(LZ4Codecs[I]);
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end;
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Codec.Initialised := False;
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Codec.Init := @LZ4Init;
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Codec.Free := @LZ4Free;
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Codec.Parse := @LZ4Parse;
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Codec.Scan1 := @LZ4Scan1;
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Codec.Scan2 := @LZ4Scan2;
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Codec.Process := @LZ4Process;
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Codec.Restore := @LZ4Restore;
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SetLength(CodecAvailable, Length(Codec.Names));
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SetLength(CodecEnabled, Length(Codec.Names));
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end.
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