fixed issue #40 regarding partial streams

src/Hyperion.Tests/PartialStreamTest.cs

@@ -0,0 +1,58 @@
+using System.IO;
+
+namespace Hyperion.Tests
+{
+    public class PartialStreamTest : PrimitivesTest
+    {
+        public PartialStreamTest()
+            : base(x => new OneBytePerReadStream(x))
+        {
+        }
+
+        private class OneBytePerReadStream : Stream
+        {
+            private readonly Stream _baseStream;
+
+            public OneBytePerReadStream(Stream baseStream)
+            {
+                _baseStream = baseStream;
+            }
+
+            public override void Flush()
+            {
+                _baseStream.Flush();
+            }
+
+            public override long Seek(long offset, SeekOrigin origin)
+            {
+                return _baseStream.Seek(offset, origin);
+            }
+
+            public override void SetLength(long value)
+            {
+                _baseStream.SetLength(value);
+            }
+
+            public override int Read(byte[] buffer, int offset, int count)
+            {
+                return _baseStream.Read(buffer, offset, count > 0 ? 1 : 0);
+            }
+
+            public override void Write(byte[] buffer, int offset, int count)
+            {
+                _baseStream.Write(buffer, offset, count);
+            }
+
+            public override bool CanRead => _baseStream.CanRead;
+            public override bool CanSeek => _baseStream.CanSeek;
+            public override bool CanWrite => _baseStream.CanWrite;
+            public override long Length => _baseStream.Length;
+
+            public override long Position
+            {
+                get => _baseStream.Position;
+                set => _baseStream.Position = value;
+            }
+        }
+    }
+}

src/Hyperion.Tests/PrimitivesTests.cs

@@ -8,13 +8,23 @@
 #endregion
 
 using System;
+using System.IO;
 using Xunit;
 
 namespace Hyperion.Tests
 {
 
     public class PrimitivesTest : TestBase
     {
+        public PrimitivesTest()
+        {
+        }
+
+        protected PrimitivesTest(Func<Stream, Stream> streamFacade)
+            : base(streamFacade)
+        {
+        }
+
         [Fact]
         public void CanSerializeTuple1()
         {

src/Hyperion.Tests/TestBase.cs

@@ -7,6 +7,7 @@
 // -----------------------------------------------------------------------
 #endregion
 
+using System;
 using System.IO;
 using Xunit;
 
@@ -15,12 +16,17 @@ namespace Hyperion.Tests
     public abstract class TestBase
     {
         private Serializer _serializer;
-        private readonly MemoryStream _stream;
+        private readonly Stream _stream;
 
         protected TestBase()
+            : this(x => x)
+        {
+        }
+
+        protected TestBase(Func<Stream, Stream> streamFacade)
         {
             _serializer = new Serializer();
-            _stream = new MemoryStream();
+            _stream = streamFacade(new MemoryStream());
         }
 
         protected void CustomInit(Serializer serializer)

src/Hyperion/Extensions/StreamEx.cs

@@ -15,7 +15,6 @@ namespace Hyperion.Extensions
 {
     internal static class StreamEx
     {
-
         public static uint ReadVarint32(this Stream stream)
         {
             int result = 0;
@@ -75,15 +74,15 @@ public static void WriteVarint64(this Stream stream, ulong value)
         public static uint ReadUInt16(this Stream self, DeserializerSession session)
         {
             var buffer = session.GetBuffer(2);
-            self.Read(buffer, 0, 2);
+            self.ReadFull(buffer, 0, 2);
             var res = BitConverter.ToUInt16(buffer, 0);
             return res;
         }
 
         public static int ReadInt32(this Stream self, DeserializerSession session)
         {
             var buffer = session.GetBuffer(4);
-            self.Read(buffer, 0, 4);
+            self.ReadFull(buffer, 0, 4);
             var res = BitConverter.ToInt32(buffer, 0);
             return res;
         }
@@ -92,7 +91,7 @@ public static byte[] ReadLengthEncodedByteArray(this Stream self, DeserializerSe
         {
             var length = self.ReadInt32(session);
             var buffer = new byte[length];
-            self.Read(buffer, 0, length);
+            self.ReadFull(buffer, 0, length);
             return buffer;
         }
 
@@ -190,9 +189,37 @@ public static string ReadString(this Stream stream, DeserializerSession session)
 
             var buffer = session.GetBuffer(length);
 
-            stream.Read(buffer, 0, length);
+            stream.ReadFull(buffer, 0, length);
             var res = StringEx.FromUtf8Bytes(buffer, 0, length);
             return res;
         }
+
+        /// <summary>
+        /// Repeats reading from stream until requested bytes were read.
+        /// Returns with partial result if stream can't provide enough bytes
+        /// Fixes issue: https://github.com/akkadotnet/Hyperion/issues/40
+        /// Reference for allowed partial streams: https://docs.microsoft.com/en-us/dotnet/api/system.io.stream.read?redirectedfrom=MSDN&view=netcore-3.1#System_IO_Stream_Read_System_Byte___System_Int32_System_Int32_
+        /// -> "An implementation is free to return fewer bytes than requested even if the end of the stream has not been reached."
+        /// </summary>
+        public static int ReadFull(this Stream stream, byte[] buffer, int offset, int count)
+        {
+            // fast path for streams which doesn't deliver partial results
+            var totalReadBytes = stream.Read(buffer, offset, count);
+            if (totalReadBytes == count)
+                return totalReadBytes;
+
+            // support streams with partial results
+            do
+            {
+                var readBytes = stream.Read(buffer, offset + totalReadBytes, count - totalReadBytes);
+                if (readBytes == 0)
+                    break;
+
+                totalReadBytes += readBytes;
+            }
+            while (totalReadBytes < count);
+
+            return totalReadBytes;
+        }
     }
 }

src/Hyperion/ValueSerializers/CharSerializer.cs

@@ -9,6 +9,7 @@
 
 using System;
 using System.IO;
+using Hyperion.Extensions;
 
 namespace Hyperion.ValueSerializers
 {
@@ -24,7 +25,7 @@ public CharSerializer() : base(Manifest, () => WriteValueImpl, () => ReadValueIm
 
         public static char ReadValueImpl(Stream stream, byte[] bytes)
         {
-            stream.Read(bytes, 0, Size);
+            stream.ReadFull(bytes, 0, Size);
             return BitConverter.ToChar(bytes, 0);
         }
 

src/Hyperion/ValueSerializers/ConsistentArraySerializer.cs

@@ -36,7 +36,7 @@ public override object ReadValue(Stream stream, DeserializerSession session)
                 var size = elementType.GetTypeSize();
                 var totalSize = size*length;
                 var buffer = session.GetBuffer(totalSize);
-                stream.Read(buffer, 0, totalSize);
+                stream.ReadFull(buffer, 0, totalSize);
                 Buffer.BlockCopy(buffer, 0, array, 0, totalSize);
             }
             else

src/Hyperion/ValueSerializers/DateTimeOffsetSerializer.cs

@@ -9,6 +9,7 @@
 
 using System;
 using System.IO;
+using Hyperion.Extensions;
 
 namespace Hyperion.ValueSerializers
 {
@@ -36,7 +37,7 @@ public static DateTimeOffset ReadValueImpl(Stream stream, byte[] bytes)
 
         private static DateTimeOffset ReadDateTimeOffset(Stream stream, byte[] bytes)
         {
-            stream.Read(bytes, 0, Size);
+            stream.ReadFull(bytes, 0, Size);
             var dateTimeTicks = BitConverter.ToInt64(bytes, 0);
             var offsetTicks = BitConverter.ToInt64(bytes, sizeof(long));
             var dateTimeOffset = new DateTimeOffset(dateTimeTicks, TimeSpan.FromTicks(offsetTicks));

src/Hyperion/ValueSerializers/DateTimeSerializer.cs

@@ -9,6 +9,7 @@
 
 using System;
 using System.IO;
+using Hyperion.Extensions;
 
 namespace Hyperion.ValueSerializers
 {
@@ -36,7 +37,7 @@ public static DateTime ReadValueImpl(Stream stream, byte[] bytes)
 
         private static DateTime ReadDateTime(Stream stream, byte[] bytes)
         {
-            stream.Read(bytes, 0, Size);
+            stream.ReadFull(bytes, 0, Size);
             var ticks = BitConverter.ToInt64(bytes, 0);
             var kind = (DateTimeKind) bytes[Size - 1]; //avoid reading a single byte from the stream
             var dateTime = new DateTime(ticks, kind);

src/Hyperion/ValueSerializers/DoubleSerializer.cs

@@ -9,6 +9,7 @@
 
 using System;
 using System.IO;
+using Hyperion.Extensions;
 
 namespace Hyperion.ValueSerializers
 {
@@ -30,7 +31,7 @@ public static void WriteValueImpl(Stream stream, double d, byte[] bytes)
 
         public static double ReadValueImpl(Stream stream, byte[] bytes)
         {
-            stream.Read(bytes, 0, Size);
+            stream.ReadFull(bytes, 0, Size);
             return BitConverter.ToDouble(bytes, 0);
         }
 

src/Hyperion/ValueSerializers/FloatSerializer.cs

@@ -9,6 +9,7 @@
 
 using System;
 using System.IO;
+using Hyperion.Extensions;
 
 namespace Hyperion.ValueSerializers
 {
@@ -30,7 +31,7 @@ public static void WriteValueImpl(Stream stream, float f, byte[] bytes)
 
         public static float ReadValueImpl(Stream stream, byte[] bytes)
         {
-            stream.Read(bytes, 0, Size);
+            stream.ReadFull(bytes, 0, Size);
             return BitConverter.ToSingle(bytes, 0);
         }
 

src/Hyperion/ValueSerializers/GuidSerializer.cs

@@ -31,7 +31,7 @@ public static void WriteValueImpl(Stream stream, Guid g)
         public static Guid ReadValueImpl(Stream stream)
         {
             var buffer = new byte[16];
-            stream.Read(buffer, 0, 16);
+            stream.ReadFull(buffer, 0, 16);
             return new Guid(buffer);
         }
     }

src/Hyperion/ValueSerializers/Int16Serializer.cs

@@ -9,6 +9,7 @@
 
 using System;
 using System.IO;
+using Hyperion.Extensions;
 
 namespace Hyperion.ValueSerializers
 {
@@ -30,7 +31,7 @@ public static void WriteValueImpl(Stream stream, short sh, byte[] bytes)
 
         public static short ReadValueImpl(Stream stream, byte[] bytes)
         {
-            stream.Read(bytes, 0, Size);
+            stream.ReadFull(bytes, 0, Size);
             return BitConverter.ToInt16(bytes, 0);
         }
 

src/Hyperion/ValueSerializers/Int32Serializer.cs

@@ -9,6 +9,7 @@
 
 using System;
 using System.IO;
+using Hyperion.Extensions;
 
 namespace Hyperion.ValueSerializers
 {
@@ -37,7 +38,7 @@ public static void WriteValueImpl(Stream stream, int i, SerializerSession sessio
 
         public static int ReadValueImpl(Stream stream, byte[] bytes)
         {
-            stream.Read(bytes, 0, Size);
+            stream.ReadFull(bytes, 0, Size);
             return BitConverter.ToInt32(bytes, 0);
         }
 

src/Hyperion/ValueSerializers/Int64Serializer.cs

@@ -9,6 +9,7 @@
 
 using System;
 using System.IO;
+using Hyperion.Extensions;
 
 namespace Hyperion.ValueSerializers
 {
@@ -30,7 +31,7 @@ public static void WriteValueImpl(Stream stream, long l, byte[] bytes)
 
         public static long ReadValueImpl(Stream stream, byte[] bytes)
         {
-            stream.Read(bytes, 0, Size);
+            stream.ReadFull(bytes, 0, Size);
             return BitConverter.ToInt64(bytes, 0);
         }
 

src/Hyperion/ValueSerializers/UInt16Serializer.cs

@@ -9,6 +9,7 @@
 
 using System;
 using System.IO;
+using Hyperion.Extensions;
 
 namespace Hyperion.ValueSerializers
 {
@@ -35,7 +36,7 @@ public static void WriteValueImpl(Stream stream, ushort u, SerializerSession ses
 
         public static ushort ReadValueImpl(Stream stream, byte[] bytes)
         {
-            stream.Read(bytes, 0, Size);
+            stream.ReadFull(bytes, 0, Size);
             return BitConverter.ToUInt16(bytes, 0);
         }
 

src/Hyperion/ValueSerializers/UInt32Serializer.cs

@@ -9,6 +9,7 @@
 
 using System;
 using System.IO;
+using Hyperion.Extensions;
 
 namespace Hyperion.ValueSerializers
 {
@@ -30,7 +31,7 @@ public static void WriteValueImpl(Stream stream, uint u, byte[] bytes)
 
         public static uint ReadValueImpl(Stream stream, byte[] bytes)
         {
-            stream.Read(bytes, 0, Size);
+            stream.ReadFull(bytes, 0, Size);
             return BitConverter.ToUInt32(bytes, 0);
         }
 

src/Hyperion/ValueSerializers/UInt64Serializer.cs

@@ -9,6 +9,7 @@
 
 using System;
 using System.IO;
+using Hyperion.Extensions;
 
 namespace Hyperion.ValueSerializers
 {
@@ -30,7 +31,7 @@ public static void WriteValueImpl(Stream stream, ulong ul, byte[] bytes)
 
         public static ulong ReadValueImpl(Stream stream, byte[] bytes)
         {
-            stream.Read(bytes, 0, Size);
+            stream.ReadFull(bytes, 0, Size);
             return BitConverter.ToUInt64(bytes, 0);
         }