(C#) Unzip Binary File to Stream

Demonstrates how to unzip a large binary file to a stream to allow the application to process the uncompressed bytes chunk by chunk.

Note: This example requires Chilkat v9.5.0.67 or greater.

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// This requires the Chilkat Zip API to have been previously unlocked.
// See Unlock Chilkat Zip for sample code.

Chilkat.Zip zip = new Chilkat.Zip();

// First open a .zip.
bool success = zip.OpenZip("qa_data/zips/big.zip");
if (success != true) {
    Debug.WriteLine(zip.LastErrorText);
    return;
}

// Get the entry to be unzipped to a stream..
Chilkat.ZipEntry entry = zip.GetEntryByIndex(0);
if (zip.LastMethodSuccess != true) {
    Debug.WriteLine(zip.LastErrorText);
    return;
}

Chilkat.Stream dataStream = new Chilkat.Stream();

Chilkat.Task unzipTask = entry.UnzipToStreamAsync(dataStream);
if (entry.LastMethodSuccess != true) {
    Debug.WriteLine(entry.LastErrorText);

    return;
}

// Start the background unzip thread.
unzipTask.Run();

// We'll read the uncompressed data chunk-by-chunk and write to an output file.
Chilkat.FileAccess fac = new Chilkat.FileAccess();
success = fac.OpenForWrite("qa_output/out.dat");
if (success != true) {
    Debug.WriteLine(fac.LastErrorText);

    return;
}

// Read the stream.  (this is reading the unzipped file data)
Chilkat.BinData bd = new Chilkat.BinData();
while (dataStream.EndOfStream != true) {
    // Get the next chunk of decompressed bytes.
    dataStream.ReadBd(bd);
    // Do something with it..
    // In this simple example, we'll just write to the file.
    fac.FileWriteBd(bd,0,0);
    // Clear for the next read.
    bd.Clear();
}

fac.FileClose();

Debug.WriteLine("Success.");