/// <summary>
/// Constructor which creates a new <see cref="ZLibStream" /> object and initializes it as a compression or a decompression one depending on the <paramref name="dir"/> parameter.
/// </summary>
/// <param name="stream">The stream containing compressed data for decompression or the stream to store compressed data for compression.</param>
/// <param name="dir">One of the <see cref="CompressionDirection" /> values that indicates the action to take (compression or decompression).</param>
/// <param name="leaveOpen">Whether we need to leave the underlying stream open when <see cref="ZLibStream.Close">closing</see> the current stream.</param>
public ZLibStream(Stream stream, CompressionDirection dir, bool leaveOpen)
{
if (stream == null)
{
throw new ArgumentNullException("Stream to decompression cannot be null", "stream");
}
this.compressionDirection = dir;
this._stream = stream;
this.leaveOpen = leaveOpen;
if (dir == CompressionDirection.Compression)
{
if (!this._stream.CanWrite)
{
throw new ArgumentException("The stream is not writable", "stream");
}
this.compressionStream = new ZOutputStream(this._stream, this.compLevel);
}
else
{
if (!this._stream.CanRead)
{
throw new ArgumentException("The stream is not readable", "stream");
}
this.decompressionStream = new ZInputStream(this._stream);
}
}
internal static void DecompressData(byte[] inData, out byte[] outData)
{
try {
using (Stream inMemoryStream = new MemoryStream(inData))
using (ZInputStream outZStream = new ZInputStream(inMemoryStream)) {
MemoryStream outMemoryStream = new MemoryStream();
CopyStream(outZStream, outMemoryStream);
outData = outMemoryStream.ToArray();
}
}
catch {
outData = new byte[0];
}
}