I’m going to use the \r\nDeflateStream class in the following way:
\r\n1) \r\nCompress something to an underlying stream via DeflateStream.
\r\n2) \r\nAdd some another data to the underlying stream
\r\n3) \r\nSet position of the underlying stream to 0.
\r\n4) \r\nDecompress initial data.
\r\nAnd now the question – is the position of DeflateStream always equal to the size of the compressed data created on the step1. So, the data added on the step 2 can be safely read if I set the position of the underlying stream\r\n to the same value.
\r\nHere’s the example of the code.
\r\n \r\n//1 var buf1 = \r\nnew byte[100];
\r\n \r\nusing (var ds = \r\nnew Ionic.Zlib.DeflateStream(underlyingStream, CompressionMode.Compress, \r\ntrue))
\r\n {
\r\n ds.Write(buf1,0, buf1.Length);
\r\n }
\r\n \r\nvar savedPosition = underlyingStream.Position;
\r\n \r\n//2
\r\n \r\nvar buf2 = new \r\nbyte[50];
\r\n underlyingStream.Write(buf2, 0, buf2.Length);
\r\n \r\n//3
\r\n underlyingStream.Position = 0;
\r\n \r\n//4
\r\n \r\nvar buf3 = new \r\nbyte[buf1.Length];
\r\n \r\nusing (var ds = \r\nnew Ionic.Zlib.DeflateStream(underlyingStream, CompressionMode.Decompress,\r\ntrue))
\r\n {
\r\n ds.Read(buf3, 0, buf3.Length);
\r\n \r\nif (savedPosition != ds.Position) \r\nthrow new Exception("The initaial size of the compreassed data is not equal to the readed size.");
\r\n }
\r\n