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Packages/com.tivadar.best.http/Runtime/3rdParty/BouncyCastle/util/io/PushbackStream.cs

@@ -0,0 +1,87 @@
+#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
+#pragma warning disable
+using System;
+using System.IO;
+
+namespace Best.HTTP.SecureProtocol.Org.BouncyCastle.Utilities.IO
+{
+	public class PushbackStream
+		: FilterStream
+	{
+		private int m_buf = -1;
+
+		public PushbackStream(Stream s)
+			: base(s)
+		{
+		}
+
+#if NETCOREAPP2_0_OR_GREATER || NETSTANDARD2_1_OR_GREATER || (UNITY_2021_2_OR_NEWER && (NET_STANDARD_2_0 || NET_STANDARD_2_1))
+        public override void CopyTo(Stream destination, int bufferSize)
+        {
+			if (m_buf != -1)
+			{
+				destination.WriteByte((byte)m_buf);
+                m_buf = -1;
+            }
+
+            s.CopyTo(destination, bufferSize);
+        }
+#endif
+
+        public override int Read(byte[] buffer, int offset, int count)
+		{
+			Streams.ValidateBufferArguments(buffer, offset, count);
+
+			if (m_buf != -1)
+			{
+				if (count < 1)
+					return 0;
+
+				buffer[offset] = (byte)m_buf;
+				m_buf = -1;
+				return 1;
+			}
+
+			return s.Read(buffer, offset, count);
+		}
+
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER || UNITY_2021_2_OR_NEWER
+        public override int Read(Span<byte> buffer)
+        {
+			if (m_buf != -1)
+			{
+                if (buffer.IsEmpty)
+                    return 0;
+
+                buffer[0] = (byte)m_buf;
+                m_buf = -1;
+                return 1;
+            }
+
+            return s.Read(buffer);
+        }
+#endif
+
+        public override int ReadByte()
+		{
+			if (m_buf != -1)
+			{
+				int tmp = m_buf;
+				m_buf = -1;
+				return tmp;
+			}
+
+			return base.ReadByte();
+		}
+
+		public virtual void Unread(int b)
+		{
+			if (m_buf != -1)
+				throw new InvalidOperationException("Can only push back one byte");
+
+			m_buf = b & 0xFF;
+		}
+	}
+}
+#pragma warning restore
+#endif