init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Utilities/Zlib/ZInputStream.cs

@@ -0,0 +1,196 @@
+using System;
+using System.IO;
+
+namespace Org.BouncyCastle.Utilities.Zlib;
+
+public class ZInputStream : Stream
+{
+	private const int BufferSize = 512;
+
+	protected ZStream z;
+
+	protected int flushLevel = 0;
+
+	protected byte[] buf = new byte[512];
+
+	protected byte[] buf1 = new byte[1];
+
+	protected bool compress;
+
+	protected Stream input;
+
+	protected bool closed;
+
+	private bool nomoreinput = false;
+
+	public sealed override bool CanRead => !closed;
+
+	public sealed override bool CanSeek => false;
+
+	public sealed override bool CanWrite => false;
+
+	public virtual int FlushMode
+	{
+		get
+		{
+			return flushLevel;
+		}
+		set
+		{
+			flushLevel = value;
+		}
+	}
+
+	public sealed override long Length
+	{
+		get
+		{
+			throw new NotSupportedException();
+		}
+	}
+
+	public sealed override long Position
+	{
+		get
+		{
+			throw new NotSupportedException();
+		}
+		set
+		{
+			throw new NotSupportedException();
+		}
+	}
+
+	public virtual long TotalIn => z.total_in;
+
+	public virtual long TotalOut => z.total_out;
+
+	private static ZStream GetDefaultZStream(bool nowrap)
+	{
+		ZStream zStream = new ZStream();
+		zStream.inflateInit(nowrap);
+		return zStream;
+	}
+
+	public ZInputStream(Stream input)
+		: this(input, nowrap: false)
+	{
+	}
+
+	public ZInputStream(Stream input, bool nowrap)
+		: this(input, GetDefaultZStream(nowrap))
+	{
+	}
+
+	public ZInputStream(Stream input, ZStream z)
+	{
+		if (z == null)
+		{
+			z = new ZStream();
+		}
+		if (z.istate == null && z.dstate == null)
+		{
+			z.inflateInit();
+		}
+		this.input = input;
+		compress = z.istate == null;
+		this.z = z;
+		this.z.next_in = buf;
+		this.z.next_in_index = 0;
+		this.z.avail_in = 0;
+	}
+
+	public ZInputStream(Stream input, int level)
+		: this(input, level, nowrap: false)
+	{
+	}
+
+	public ZInputStream(Stream input, int level, bool nowrap)
+	{
+		this.input = input;
+		compress = true;
+		z = new ZStream();
+		z.deflateInit(level, nowrap);
+		z.next_in = buf;
+		z.next_in_index = 0;
+		z.avail_in = 0;
+	}
+
+	public override void Close()
+	{
+		if (!closed)
+		{
+			closed = true;
+			Platform.Dispose(input);
+			base.Close();
+		}
+	}
+
+	public sealed override void Flush()
+	{
+	}
+
+	public override int Read(byte[] b, int off, int len)
+	{
+		if (len == 0)
+		{
+			return 0;
+		}
+		z.next_out = b;
+		z.next_out_index = off;
+		z.avail_out = len;
+		int num;
+		do
+		{
+			if (z.avail_in == 0 && !nomoreinput)
+			{
+				z.next_in_index = 0;
+				z.avail_in = input.Read(buf, 0, buf.Length);
+				if (z.avail_in <= 0)
+				{
+					z.avail_in = 0;
+					nomoreinput = true;
+				}
+			}
+			num = (compress ? z.deflate(flushLevel) : z.inflate(flushLevel));
+			if (nomoreinput && num == -5)
+			{
+				return 0;
+			}
+			if (num != 0 && num != 1)
+			{
+				throw new IOException((compress ? "de" : "in") + "flating: " + z.msg);
+			}
+			if ((nomoreinput || num == 1) && z.avail_out == len)
+			{
+				return 0;
+			}
+		}
+		while (z.avail_out == len && num == 0);
+		return len - z.avail_out;
+	}
+
+	public override int ReadByte()
+	{
+		if (Read(buf1, 0, 1) <= 0)
+		{
+			return -1;
+		}
+		return buf1[0];
+	}
+
+	public sealed override long Seek(long offset, SeekOrigin origin)
+	{
+		throw new NotSupportedException();
+	}
+
+	public sealed override void SetLength(long value)
+	{
+		throw new NotSupportedException();
+	}
+
+	public sealed override void Write(byte[] buffer, int offset, int count)
+	{
+		throw new NotSupportedException();
+	}
+}