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unit zwrapper;
interface
function ZDecompressBuf(const inBuffer: pointer; inSize: integer; out outBuffer: pointer; out outSize: integer; outEstimate: integer): integer;
implementation
uses zlib;
function ZDecompressBuf(const inBuffer: pointer; inSize: integer; out outBuffer: pointer; out outSize: integer; outEstimate: integer): integer;
var
zstream : TZStreamRec;
delta : integer;
begin
FillChar(zstream, SizeOf(TZStreamRec), 0);
delta := (inSize + 255) and not 255;
if outEstimate = 0 then outSize := delta
else outSize := outEstimate;
Result := Z_OK;
GetMem(outBuffer, outSize);
try
zstream.next_in := inBuffer;
zstream.avail_in := inSize;
zstream.next_out := outBuffer;
zstream.avail_out := outSize;
Result := InflateInit(zstream);
if Result < 0 then Exit;
try
Result := inflate(zstream, Z_NO_FLUSH);
if Result < 0 then Exit;
while (Result <> Z_STREAM_END) do begin
Inc(outSize, delta);
ReallocMem(outBuffer, outSize);
zstream.next_out := {$IFDEF FPC}PBytef{$ENDIF}(PByte(outBuffer) + zstream.total_out);
zstream.avail_out := delta;
Result := inflate(zstream, Z_NO_FLUSH);
if Result < 0 then Exit;
end;
finally
inflateEnd(zstream);
end;
ReallocMem(outBuffer, zstream.total_out);
outSize := zstream.total_out;
finally
if Result < 0 then FreeMem(outBuffer);
end;
end;
end.
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