From 14763ac7c6c03bca62c39e35c03cf5bfc7728802 Mon Sep 17 00:00:00 2001 From: Mark Adler Date: Fri, 9 Sep 2011 23:20:29 -0700 Subject: zlib 1.1.3 --- contrib/delphi2/zlib.pas | 534 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 534 insertions(+) create mode 100644 contrib/delphi2/zlib.pas (limited to 'contrib/delphi2/zlib.pas') diff --git a/contrib/delphi2/zlib.pas b/contrib/delphi2/zlib.pas new file mode 100644 index 0000000..10ae4ca --- /dev/null +++ b/contrib/delphi2/zlib.pas @@ -0,0 +1,534 @@ +{*******************************************************} +{ } +{ Delphi Supplemental Components } +{ ZLIB Data Compression Interface Unit } +{ } +{ Copyright (c) 1997 Borland International } +{ } +{*******************************************************} + +{ Modified for zlib 1.1.3 by Davide Moretti Z_STREAM_END do + begin + P := OutBuf; + Inc(OutBytes, 256); + ReallocMem(OutBuf, OutBytes); + strm.next_out := PChar(Integer(OutBuf) + (Integer(strm.next_out) - Integer(P))); + strm.avail_out := 256; + end; + finally + CCheck(deflateEnd(strm)); + end; + ReallocMem(OutBuf, strm.total_out); + OutBytes := strm.total_out; + except + FreeMem(OutBuf); + raise + end; +end; + + +procedure DecompressBuf(const InBuf: Pointer; InBytes: Integer; + OutEstimate: Integer; out OutBuf: Pointer; out OutBytes: Integer); +var + strm: TZStreamRec; + P: Pointer; + BufInc: Integer; +begin + FillChar(strm, sizeof(strm), 0); + BufInc := (InBytes + 255) and not 255; + if OutEstimate = 0 then + OutBytes := BufInc + else + OutBytes := OutEstimate; + GetMem(OutBuf, OutBytes); + try + strm.next_in := InBuf; + strm.avail_in := InBytes; + strm.next_out := OutBuf; + strm.avail_out := OutBytes; + DCheck(inflateInit_(strm, zlib_version, sizeof(strm))); + try + while DCheck(inflate(strm, Z_FINISH)) <> Z_STREAM_END do + begin + P := OutBuf; + Inc(OutBytes, BufInc); + ReallocMem(OutBuf, OutBytes); + strm.next_out := PChar(Integer(OutBuf) + (Integer(strm.next_out) - Integer(P))); + strm.avail_out := BufInc; + end; + finally + DCheck(inflateEnd(strm)); + end; + ReallocMem(OutBuf, strm.total_out); + OutBytes := strm.total_out; + except + FreeMem(OutBuf); + raise + end; +end; + + +// TCustomZlibStream + +constructor TCustomZLibStream.Create(Strm: TStream); +begin + inherited Create; + FStrm := Strm; + FStrmPos := Strm.Position; +end; + +procedure TCustomZLibStream.Progress(Sender: TObject); +begin + if Assigned(FOnProgress) then FOnProgress(Sender); +end; + + +// TCompressionStream + +constructor TCompressionStream.Create(CompressionLevel: TCompressionLevel; + Dest: TStream); +const + Levels: array [TCompressionLevel] of ShortInt = + (Z_NO_COMPRESSION, Z_BEST_SPEED, Z_DEFAULT_COMPRESSION, Z_BEST_COMPRESSION); +begin + inherited Create(Dest); + FZRec.next_out := FBuffer; + FZRec.avail_out := sizeof(FBuffer); + CCheck(deflateInit_(FZRec, Levels[CompressionLevel], zlib_version, sizeof(FZRec))); +end; + +destructor TCompressionStream.Destroy; +begin + FZRec.next_in := nil; + FZRec.avail_in := 0; + try + if FStrm.Position <> FStrmPos then FStrm.Position := FStrmPos; + while (CCheck(deflate(FZRec, Z_FINISH)) <> Z_STREAM_END) + and (FZRec.avail_out = 0) do + begin + FStrm.WriteBuffer(FBuffer, sizeof(FBuffer)); + FZRec.next_out := FBuffer; + FZRec.avail_out := sizeof(FBuffer); + end; + if FZRec.avail_out < sizeof(FBuffer) then + FStrm.WriteBuffer(FBuffer, sizeof(FBuffer) - FZRec.avail_out); + finally + deflateEnd(FZRec); + end; + inherited Destroy; +end; + +function TCompressionStream.Read(var Buffer; Count: Longint): Longint; +begin + raise ECompressionError.Create('Invalid stream operation'); +end; + +function TCompressionStream.Write(const Buffer; Count: Longint): Longint; +begin + FZRec.next_in := @Buffer; + FZRec.avail_in := Count; + if FStrm.Position <> FStrmPos then FStrm.Position := FStrmPos; + while (FZRec.avail_in > 0) do + begin + CCheck(deflate(FZRec, 0)); + if FZRec.avail_out = 0 then + begin + FStrm.WriteBuffer(FBuffer, sizeof(FBuffer)); + FZRec.next_out := FBuffer; + FZRec.avail_out := sizeof(FBuffer); + FStrmPos := FStrm.Position; + Progress(Self); + end; + end; + Result := Count; +end; + +function TCompressionStream.Seek(Offset: Longint; Origin: Word): Longint; +begin + if (Offset = 0) and (Origin = soFromCurrent) then + Result := FZRec.total_in + else + raise ECompressionError.Create('Invalid stream operation'); +end; + +function TCompressionStream.GetCompressionRate: Single; +begin + if FZRec.total_in = 0 then + Result := 0 + else + Result := (1.0 - (FZRec.total_out / FZRec.total_in)) * 100.0; +end; + + +// TDecompressionStream + +constructor TDecompressionStream.Create(Source: TStream); +begin + inherited Create(Source); + FZRec.next_in := FBuffer; + FZRec.avail_in := 0; + DCheck(inflateInit_(FZRec, zlib_version, sizeof(FZRec))); +end; + +destructor TDecompressionStream.Destroy; +begin + inflateEnd(FZRec); + inherited Destroy; +end; + +function TDecompressionStream.Read(var Buffer; Count: Longint): Longint; +begin + FZRec.next_out := @Buffer; + FZRec.avail_out := Count; + if FStrm.Position <> FStrmPos then FStrm.Position := FStrmPos; + while (FZRec.avail_out > 0) do + begin + if FZRec.avail_in = 0 then + begin + FZRec.avail_in := FStrm.Read(FBuffer, sizeof(FBuffer)); + if FZRec.avail_in = 0 then + begin + Result := Count - FZRec.avail_out; + Exit; + end; + FZRec.next_in := FBuffer; + FStrmPos := FStrm.Position; + Progress(Self); + end; + DCheck(inflate(FZRec, 0)); + end; + Result := Count; +end; + +function TDecompressionStream.Write(const Buffer; Count: Longint): Longint; +begin + raise EDecompressionError.Create('Invalid stream operation'); +end; + +function TDecompressionStream.Seek(Offset: Longint; Origin: Word): Longint; +var + I: Integer; + Buf: array [0..4095] of Char; +begin + if (Offset = 0) and (Origin = soFromBeginning) then + begin + DCheck(inflateReset(FZRec)); + FZRec.next_in := FBuffer; + FZRec.avail_in := 0; + FStrm.Position := 0; + FStrmPos := 0; + end + else if ( (Offset >= 0) and (Origin = soFromCurrent)) or + ( ((Offset - FZRec.total_out) > 0) and (Origin = soFromBeginning)) then + begin + if Origin = soFromBeginning then Dec(Offset, FZRec.total_out); + if Offset > 0 then + begin + for I := 1 to Offset div sizeof(Buf) do + ReadBuffer(Buf, sizeof(Buf)); + ReadBuffer(Buf, Offset mod sizeof(Buf)); + end; + end + else + raise EDecompressionError.Create('Invalid stream operation'); + Result := FZRec.total_out; +end; + +end. -- cgit v1.2.3-55-g6feb