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Table 2-33 DeflateStream Methods
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Description Do not use. Will throw NotSupportedException. (Inherited from the Stream class.) Writes information to the stream as a number of bytes and updates the current position to reflect the new write position. (Inherited from the Stream class.) Writes a single byte to the stream and updates the position. This method is identical to calling Write with a single byte. (Inherited from the Stream class.)
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How to Compress Data with a Compression Stream
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Compression streams are a little different than the streams shown in the previous lessons. Instead of the stream writing to a resource (for example, a file for a FileStream or memory for a MemoryStream), it writes to another stream. The compression stream is used to take in data like any stream, but when it writes data, it pushes it into another stream in the compressed (or decompressed) format. The following paragraphs provide a typical example: compressing a file in the file system and writing a new compressed version of the file. First you need to open the file to be compressed and the file you are going to write to:
' VB Dim sourceFile As FileStream = File.OpenRead(inFilename) Dim destFile As FileStream = File.Create(outFilename) // C# FileStream sourceFile = File.OpenRead(inFilename); FileStream destFile = File.Create(outFilename);
Compressing a stream requires that the compression stream wrap the outgoing (or destination) stream. This task is performed in the constructor of the compression stream, as shown here:
' VB Dim compStream As _ New GZipStream(destFile, CompressionMode.Compress) // C# GZipStream compStream = new GZipStream(destFile, CompressionMode.Compress);
Lesson 3: Compressing Streams
This statement tells the compression stream to compress data and push it to the destination stream. The constructor takes a CompressionMode value that specifies whether the stream is going to be used to compress or decompress. In this case, you want to compress the stream, so you use CompressionMode.Compress. Once you have created the compression stream, it is simply a matter of reading data from the source stream and feeding it into the compression stream, as shown here:
' VB Dim theByte As Integer = sourceFile.ReadByte() While theByte <> -1 compStream.WriteByte(CType(theByte, Byte)) theByte = sourceFile.ReadByte() End While // C# int theByte = sourceFile.ReadByte(); while (theByte != -1) { compStream.WriteByte((byte)theByte); theByte = sourceFile.ReadByte(); }
This code streams data one byte at a time from the source file (sourceFile) into the compression stream (compStream). Notice that you do not write into the destination file at all (destFile). Because you are writing into the compression stream, the destination stream is being filled with the compressed version of the data from the source file. The streaming code just shown is not specific to the GZIP compression method. If we change the construction of the stream to use the DeflateStream instead, the rest of the code does not change at all. All that is required is that you create a DeflateStream instead, as shown here (notice the signature is the same as that of the GZipStream):
' VB Dim compStream As _ New DeflateStream(destFile, CompressionMode.Compress) // C# DeflateStream compStream = new DeflateStream(destFile, CompressionMode.Compress);
How to Decompress Data with a Compression Stream
Decompression uses the same program design as compression, except that the streams are dealt with slightly differently. For example, you still create your source and destination files like you did before:
' VB Dim sourceFile As FileStream = File.OpenRead(inFilename) Dim destFile As FileStream = File.Create(outFilename)
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// C# FileStream sourceFile = File.OpenRead(inFilename); FileStream destFile = File.Create(outFilename);
In this case, the source file is a compressed file and the destination file is going to be written as a decompressed file. When you create the compression stream, you change it in two ways: you wrap the source file because that is where the compressed data exists, and you specify the CompressionMode.Decompress to specify that you are decompressing the wrapped stream:
' VB Dim compStream As _ New GZipStream(sourceFile, CompressionMode.Compress) // C# GZipStream compStream = new GZipStream(sourceFile, CompressionMode.Compress);
In addition, you need to change the way you process the file to read from the compression stream instead of from the source file and write out to the file directly instead of through the compression stream:
' VB Dim theByte As Integer = compStream.ReadByte() While theByte <> -1 destFile.WriteByte(CType(theByte, Byte)) theByte = compStream.ReadByte() End While // C# int theByte = compStream.ReadByte(); while (theByte != -1) { destFile.WriteByte((byte)theByte); theByte = compStream.ReadByte(); }
In either case (compression or decompression), the compression stream is meant to wrap the stream that contains (or will contain) compressed data. Whether you read or write compressed data is completely dependent on whether you are compressing or decompressing.
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