/// <summary>
/// Initializes a new instance of the <see cref="LzssStream"/> class by using the specified stream and compression mode, and optionally leaves the stream open.
/// </summary>
/// <param name="stream">The stream to compress or decompress.</param>
/// <param name="mode">One of the enumeration values that indicates whether to compress or decompress the stream.</param>
/// <param name="leaveOpen"><c>true</c> to leave the stream open after disposing the DeflateStream object; otherwise, <c>false</c>.</param>
/// <exception cref="ArgumentNullException"><paramref name="stream"/> is <c>null</c>.</exception>
/// <exception cref="ArgumentException">
/// <paramref name="mode"/> is a valid <see cref="CompressionMode"/> value.
/// <para>-or-</para>
/// <see cref="CompressionMode"/> is <see cref="CompressionMode.Compress"/> and <see cref="CanWrite"/> is <c>false</c>.
/// <para>-or-</para>
/// <see cref="CompressionMode"/> is <see cref="CompressionMode.Decompress"/> and <see cref="CanRead"/> is <c>false</c>.
/// </exception>
public LzssStream(Stream stream, CompressionMode mode, bool leaveOpen)
{
if (CompressionMode.Compress != mode && CompressionMode.Decompress != mode)
{
throw new ArgumentException("mode is a valid CompressionMode value.", "mode");
}
BaseStream = stream ?? throw new ArgumentNullException("stream");
_mode = mode;
_leaveOpen = leaveOpen;
switch (_mode)
{
case CompressionMode.Decompress:
if (!BaseStream.CanRead)
{
throw new ArgumentException("mode is CompressionMode.Decompress and CanRead is false.", "steam");
}
break;
case CompressionMode.Compress:
if (!BaseStream.CanWrite)
{
throw new ArgumentException("mode is CompressionMode.Compress and CanWrite is false.", "steam");
}
break;
}
_LzssHelper = SaluteToHaruhikoTheOkami.RentInstance(this);
}
public static SaluteToHaruhikoTheOkami RentInstance(LzssStream lzssStream)
{
var lOpion = new LzssOption(lzssStream);
var bag = _instancePool.GetOrAdd(lOpion, new ConcurrentBag <SaluteToHaruhikoTheOkami>());
if (!bag.TryTake(out var inst))
{
inst = new SaluteToHaruhikoTheOkami(lOpion);
}
return(inst);
}
/// <summary>
/// Dispose mode.
/// </summary>
/// <param name="disposing"></param>
protected override void Dispose(bool disposing)
{
try
{
if (disposing)
{
if (_LzssHelper != null)
{
SaluteToHaruhikoTheOkami.ReturnInstance(_LzssHelper);
}
if (!_leaveOpen && BaseStream != null)
{
BaseStream.Dispose();
}
}
}
finally
{
_LzssHelper = null;
BaseStream = null;
base.Dispose(disposing);
}
}
public static void ReturnInstance(SaluteToHaruhikoTheOkami inst) => _instancePool[inst._lzssOption].Add(inst);
