From 7578b70e1cfb1ab1f507afc45ec3b7e0bd93e801 Mon Sep 17 00:00:00 2001
From: Sunny <yhuse@163.com>
Date: Mon, 17 Jul 2023 23:05:41 +0800
Subject: [PATCH] =?UTF-8?q?+=20UCompress:=20=E5=A2=9E=E5=8A=A0=E6=95=B0?=
 =?UTF-8?q?=E6=8D=AE=E5=B8=A7=E5=8E=8B=E7=BC=A9=E7=B1=BB?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 SunnyUI/Common/UCompress.cs | 146 ++++++++++++++++++++++++++++++++++++
 SunnyUI/Common/UFastLZ.cs   |   6 +-
 2 files changed, 151 insertions(+), 1 deletion(-)
 create mode 100644 SunnyUI/Common/UCompress.cs

diff --git a/SunnyUI/Common/UCompress.cs b/SunnyUI/Common/UCompress.cs
new file mode 100644
index 00000000..13bcb3cb
--- /dev/null
+++ b/SunnyUI/Common/UCompress.cs
@@ -0,0 +1,146 @@
+/******************************************************************************
+ * SunnyUI 开源控件库、工具类库、扩展类库、多页面开发框架。
+ * CopyRight (C) 2012-2023 ShenYongHua(沈永华).
+ * QQ群：56829229 QQ：17612584 EMail：SunnyUI@QQ.Com
+ *
+ * Blog:   https://www.cnblogs.com/yhuse
+ * Gitee:  https://gitee.com/yhuse/SunnyUI
+ * GitHub: https://github.com/yhuse/SunnyUI
+ *
+ * SunnyUI.dll can be used for free under the GPL-3.0 license.
+ * If you use this code, please keep this note.
+ * 如果您使用此代码，请保留此说明。
+ ******************************************************************************
+ * 文件名称: UCompress.cs
+ * 文件说明: 数据帧压缩类
+ * 当前版本: V3.4
+ * 创建日期: 2023-07-17
+ *
+ * 2023-07-17: V3.4.0 增加文件说明
+******************************************************************************/
+
+using System;
+using System.Runtime.InteropServices;
+
+namespace Sunny.UI
+{
+    public enum DataFrameCompressType
+    {
+        [DisplayText("None")]
+        None = 0,
+
+        [DisplayText("FastLZ")]
+        FastLZ = 1,
+
+        [DisplayText("ZLib")]
+        ZLib = 2,
+
+        [DisplayText("GZip")]
+        GZip = 3,
+
+        [DisplayText("Deflate")]
+        Deflate = 4
+    }
+
+    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
+    public struct DataFrame
+    {
+        public DateTime DateTime;
+        public byte[] Data;
+        public int Index;
+        public int CRC;
+
+        public DataFrame(DateTime dateTime, byte[] data, int index, int crc)
+        {
+            DateTime = dateTime;
+            Data = data;
+            Index = index;
+            CRC = crc;
+        }
+
+        public static DataFrame Empty()
+        {
+#if NET40
+            return new DataFrame(DateTime.MinValue, new byte[0], -1, 0);
+#else
+            return new DataFrame(DateTime.MinValue, Array.Empty<byte>(), -1, 0);
+#endif
+        }
+    }
+
+    public static class DataFrameCompressHelper
+    {
+        public static byte[] Compress(DataFrame frame, DataFrameCompressType compressType, out int compressedLength, out int decompressLength)
+        {
+            byte[] compressed;
+            decompressLength = frame.Data.Length;
+            switch (compressType)
+            {
+                case DataFrameCompressType.None:
+                    compressed = frame.Data;
+                    break;
+                case DataFrameCompressType.FastLZ:
+                    if (FastLZ.CheckFastLZDll())
+                    {
+                        compressed = FastLZ.Compress(frame.Data, 0, frame.Data.Length);
+                        decompressLength = Math.Max(frame.Data.Length * 2, 66);
+                    }
+                    else
+                    {
+                        throw new NullReferenceException("FastLZx86.dll and FastLZx64.dll not exists.");
+                    }
+                    break;
+                case DataFrameCompressType.ZLib:
+                    compressed = frame.Data.ZLibCompress();
+                    break;
+                case DataFrameCompressType.GZip:
+                    compressed = frame.Data.GZipCompress();
+                    break;
+                case DataFrameCompressType.Deflate:
+                    compressed = frame.Data.DeflateCompress();
+                    break;
+                default:
+                    compressed = frame.Data;
+                    break;
+            }
+
+            compressedLength = compressed.Length;
+            return compressed;
+        }
+
+        public static byte[] Decompress(byte[] package, DataFrameCompressType compressType, int decompressLength)
+        {
+            byte[] data;
+            switch (compressType)
+            {
+                case DataFrameCompressType.None:
+                    data = package;
+                    break;
+                case DataFrameCompressType.FastLZ:
+                    if (FastLZ.CheckFastLZDll())
+                    {
+                        data = FastLZ.Decompress(package, 0, package.Length, decompressLength);
+                    }
+                    else
+                    {
+                        throw new NullReferenceException("FastLZx86.dll and FastLZx64.dll not exists.");
+                    }
+                    break;
+                case DataFrameCompressType.ZLib:
+                    data = package.ZLibDecompress();
+                    break;
+                case DataFrameCompressType.GZip:
+                    data = package.GZipDecompress();
+                    break;
+                case DataFrameCompressType.Deflate:
+                    data = package.DeflateDecompress();
+                    break;
+                default:
+                    data = package;
+                    break;
+            }
+
+            return data;
+        }
+    }
+}
diff --git a/SunnyUI/Common/UFastLZ.cs b/SunnyUI/Common/UFastLZ.cs
index 12c4e309..d8538818 100644
--- a/SunnyUI/Common/UFastLZ.cs
+++ b/SunnyUI/Common/UFastLZ.cs
@@ -312,7 +312,11 @@ namespace Sunny.UI
         public static bool CheckFastLZDll()
         {
             if (FileExist) return true;
-            if (File.Exists(DirEx.CurrentDir() + "FastLZx86.dll") && File.Exists(DirEx.CurrentDir() + "FastLZx64.dll")) return true;
+            if (File.Exists(DirEx.CurrentDir() + "FastLZx86.dll") && File.Exists(DirEx.CurrentDir() + "FastLZx64.dll"))
+            {
+                FileExist = true;
+                return true;
+            }
 
             try
             {