5,388
社区成员
发帖
与我相关
我的任务
分享
procedure ZDecompressStream(inStream, outStream: TStream);
const
bufferSize = 32768;
var
zstream: TZStreamRec;
zresult: Integer;
inBuffer: TBytes;
outBuffer: TBytes;
inSize: Integer;
outSize: Integer;
begin
SetLength(inBuffer, BufferSize);
SetLength(outBuffer, BufferSize);
FillChar(zstream, SizeOf(TZStreamRec), 0);
ZDecompressCheck(InflateInit(zstream));
try
inSize := inStream.Read(inBuffer, bufferSize);
while inSize > 0 do
begin
zstream.next_in := @inBuffer[0];
zstream.avail_in := inSize;
repeat
zstream.next_out := @outBuffer[0];
zstream.avail_out := bufferSize;
ZDecompressCheckWithoutBufferError(inflate(zstream, Z_NO_FLUSH));
outSize := bufferSize - zstream.avail_out;
outStream.Write(outBuffer, outSize);
until (zstream.avail_in = 0) and (zstream.avail_out > 0);
inSize := inStream.Read(inBuffer, bufferSize);
end;
repeat
zstream.next_out := @outBuffer[0];
zstream.avail_out := bufferSize;
zresult := ZDecompressCheckWithoutBufferError(inflate(zstream, Z_FINISH)); <--------------
outSize := bufferSize - zstream.avail_out;
outStream.Write(outBuffer, outSize);
until (zresult = Z_STREAM_END) and (zstream.avail_out > 0);
finally
ZDecompressCheck(inflateEnd(zstream));
end;
end;
function ZDecompressCheckWithoutBufferError(code: Integer): Integer; overload;
begin
Result := code;
if code < 0 then
if (code <> Z_BUF_ERROR) then <------------罪魁祸首
raise EZDecompressionError.Create(string(_z_errmsg[2 - code]));
end;
procedure ZDecompressStream(inStream, outStream: TStream);
const
bufferSize = 32768;
var
zstream: TZStreamRec;
zresult: Integer;
inBuffer: array[0..bufferSize - 1] of AnsiChar;
outBuffer: array[0..bufferSize - 1] of AnsiChar;
inSize: Integer;
outSize: Integer;
begin
FillChar(zstream, SizeOf(TZStreamRec), 0);
ZCompressCheck(InflateInit(zstream));
inSize := inStream.Read(inBuffer, bufferSize);
while inSize > 0 do
begin
zstream.next_in := inBuffer;
zstream.avail_in := inSize;
repeat
zstream.next_out := outBuffer;
zstream.avail_out := bufferSize;
ZCompressCheck(inflate(zstream, Z_NO_FLUSH));
// outSize := zstream.next_out - outBuffer;
outSize := bufferSize - zstream.avail_out;
outStream.Write(outBuffer, outSize);
until (zstream.avail_in = 0) and (zstream.avail_out > 0);
inSize := inStream.Read(inBuffer, bufferSize);
end;
repeat
zstream.next_out := outBuffer;
zstream.avail_out := bufferSize;
zresult := ZCompressCheck(inflate(zstream, Z_FINISH));
// outSize := zstream.next_out - outBuffer;
outSize := bufferSize - zstream.avail_out;
outStream.Write(outBuffer, outSize);
until (zresult = Z_STREAM_END) and (zstream.avail_out > 0);
ZCompressCheck(inflateEnd(zstream));
end;
function ZCompressCheck(code: Integer): Integer;
begin
result := code;
if code < 0 then
begin
raise EZCompressionError.Create(_z_errmsg[2 - code]);
end;
end;
function ZDecompressCheck(code: Integer): Integer;
begin
Result := code;
if code < 0 then
begin
raise EZDecompressionError.Create(_z_errmsg[2 - code]);
end;
end;