From 8cef6993a706ce400d7c15b964e7117f0946fba9 Mon Sep 17 00:00:00 2001 From: Havret Date: Tue, 5 Mar 2024 22:05:20 +0100 Subject: [PATCH] Decode short and medium strings --- src/ArtemisNetCoreClient/ByteBuffer.cs | 61 +++++++++++++++++ .../ByteBufferTests.cs | 66 +++++++++++++++++-- 2 files changed, 122 insertions(+), 5 deletions(-) diff --git a/src/ArtemisNetCoreClient/ByteBuffer.cs b/src/ArtemisNetCoreClient/ByteBuffer.cs index ba37d06..058d758 100644 --- a/src/ArtemisNetCoreClient/ByteBuffer.cs +++ b/src/ArtemisNetCoreClient/ByteBuffer.cs @@ -151,4 +151,65 @@ private void WriteShort(short value) BinaryPrimitives.WriteInt16BigEndian(buffer, value); _memoryStream.Write(buffer); } + + private short ReadShort() + { + Span buffer = stackalloc byte[sizeof(short)]; + _ = _memoryStream.Read(buffer); + return BinaryPrimitives.ReadInt16BigEndian(buffer); + } + + public string ReadString() + { + var length = ReadInt(); + if (length < 9) + { + return ReadAsShorts(length); + } + else if (length < 0xFFF) + { + var actualByteCount = ReadShort(); + if (actualByteCount < 128) + { + Span buffer = stackalloc byte[actualByteCount]; + _ = _memoryStream.Read(buffer); + return Encoding.UTF8.GetString(buffer); + } + else + { + + var rented = ArrayPool.Shared.Rent(actualByteCount); + try + { + _ = _memoryStream.Read(rented, 0, actualByteCount); + return Encoding.UTF8.GetString(rented, 0, actualByteCount); + } + finally + { + ArrayPool.Shared.Return(rented); + } + } + } + else + { + return ReadAsBytes(); + } + } + + private string ReadAsBytes() + { + return string.Empty; + } + + private string ReadAsShorts(int length) + { + Span chars = stackalloc char[length]; + for (int i = 0; i < length; i++) + { + var c = (char) ReadShort(); + chars[i] = c; + } + + return new string(chars); + } } \ No newline at end of file diff --git a/test/ArtemisNetCoreClient.Tests/ByteBufferTests.cs b/test/ArtemisNetCoreClient.Tests/ByteBufferTests.cs index e9cbafb..4d6f40a 100644 --- a/test/ArtemisNetCoreClient.Tests/ByteBufferTests.cs +++ b/test/ArtemisNetCoreClient.Tests/ByteBufferTests.cs @@ -130,7 +130,7 @@ public void should_decode_long() } [Test] - public void should_write_short_string() + public void should_encode_short_string() { // Arrange var byteBuffer = new ByteBuffer(); @@ -144,7 +144,20 @@ public void should_write_short_string() } [Test] - public void should_write_medium_string_1() + public void should_decode_short_string() + { + // Arrange + var byteBuffer = new ByteBuffer([0, 0, 0, 8, 0, 97, 0, 98, 0, 99, 0, 100, 0, 101, 0, 102, 0, 103, 0, 104]); + + // Act + var value = byteBuffer.ReadString(); + + // Assert + Assert.That(value, Is.EqualTo("abcdefgh")); + } + + [Test] + public void should_encode_medium_string_1() { // Arrange var byteBuffer = new ByteBuffer(); @@ -159,13 +172,27 @@ public void should_write_medium_string_1() } [Test] - public void should_write_medium_string_2() + public void should_decode_medium_string_1() + { + // Arrange + var byteBuffer = new ByteBuffer([0, 0, 0, 12, 0, 12, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108]); + + // Act + // Payload is small enough so we can use stackalloc optimization + var value = byteBuffer.ReadString(); + + // Assert + Assert.That(value, Is.EqualTo("abcdefghijkl")); + } + + [Test] + public void should_encode_medium_string_2() { // Arrange var byteBuffer = new ByteBuffer(); // Act - // Payload is large enough so we can have to use ArrayPool instead of stackalloc + // Payload is large enough so we have to use ArrayPool instead of stackalloc var str = Enumerable.Repeat(0, 17).Aggregate("", (s, _) => s + "abcdefgh"); byteBuffer.WriteString(str); @@ -175,7 +202,22 @@ public void should_write_medium_string_2() } [Test] - public void should_long_string() + public void should_decode_medium_string_2() + { + // Arrange + var byteBuffer = new ByteBuffer([0, 0, 0, unchecked((byte) -120), 0, unchecked((byte) -120), 97, 98, 99, 100, 101, 102, 103, 104, 97, 98, 99, 100, 101, 102, 103, 104, 97, 98, 99, 100, 101, 102, 103, 104, 97, 98, 99, 100, 101, 102, 103, 104, 97, 98, 99, 100, 101, 102, 103, 104, 97, 98, 99, 100, 101, 102, 103, 104, 97, 98, 99, 100, 101, 102, 103, 104, 97, 98, 99, 100, 101, 102, 103, 104, 97, 98, 99, 100, 101, 102, 103, 104, 97, 98, 99, 100, 101, 102, 103, 104, 97, 98, 99, 100, 101, 102, 103, 104, 97, 98, 99, 100, 101, 102, 103, 104, 97, 98, 99, 100, 101, 102, 103, 104, 97, 98, 99, 100, 101, 102, 103, 104, 97, 98, 99, 100, 101, 102, 103, 104, 97, 98, 99, 100, 101, 102, 103, 104, 97, 98, 99, 100, 101, 102, 103, 104]); + + // Act + // Payload is large enough so we have to use ArrayPool instead of stackalloc + var value = byteBuffer.ReadString(); + + // Assert + var expected = Enumerable.Repeat(0, 17).Aggregate("", (s, _) => s + "abcdefgh"); + Assert.That(value, Is.EqualTo(expected)); + } + + [Test] + public void should_encode_long_string() { // Arrange var byteBuffer = new ByteBuffer(); @@ -189,6 +231,20 @@ public void should_long_string() 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98, 0, 99, 0, 100, 0, 101, 0, 102, 0, 103, 0, 104, 0, 97, 0, 98, 0, 99, 0, 100, 0, 101, 0, 102, 0, 103, 0, 104, 0, 97, 0, 98, 0, 99, 0, 100, 0, 101, 0, 102, 0, 103, 0, 104, 0, 97, 0, 98, 0, 99, 0, 100, 0, 101, 0, 102, 0, 103, 0, 104, 0, 97, 0, 98, 0, 99, 0, 100, 0, 101, 0, 102, 0, 103, 0, 104, 0, 97, 0, 98, 0, 99, 0, 100, 0, 101, 0, 102, 0, 103, 0, 104, 0, 97, 0, 98, 0, 99, 0, 100, 0, 101, 0, 102, 0, 103, 0, 104, 0, 97, 0, 98, 0, 99, 0, 100, 0, 101, 0, 102, 0, 103, 0, 104, 0, 97, 0, 98, 0, 99, 0, 100, 0, 101, 0, 102, 0, 103, 0, 104, 0]); + + // Act + var value = byteBuffer.ReadString(); + + // Assert + var expected = Enumerable.Repeat(0, 513).Aggregate("", (s, _) => s + "abcdefgh"); + Assert.That(value, Is.EqualTo(expected)); + } + [TestCase("abcdefgh", new byte[] { 1, 0, 0, 0, 8, 0, 97, 0, 98, 0, 99, 0, 100, 0, 101, 0, 102, 0, 103, 0, 104 })] [TestCase(null, new byte[] { 0 })] public void should_nullable_string(string value, byte[] encoded)