Загрузка PICO Unity OpenXR Integration SDK

Packages/PICO Unity OpenXR Integration SDK-1.3.0-20241011/Platform/Scripts/CLIB/MarshalUtil.cs

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+/*******************************************************************************
+Copyright © 2015-2022 PICO Technology Co., Ltd.All rights reserved.
+
+NOTICE：All information contained herein is, and remains the property of
+PICO Technology Co., Ltd. The intellectual and technical concepts
+contained herein are proprietary to PICO Technology Co., Ltd. and may be
+covered by patents, patents in process, and are protected by trade secret or
+copyright law. Dissemination of this information or reproduction of this
+material is strictly forbidden unless prior written permission is obtained from
+PICO Technology Co., Ltd.
+*******************************************************************************/
+
+using System;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace Pico.Platform
+{
+    public class UTF8Marshaller : ICustomMarshaler
+    {
+        public void CleanUpManagedData(object ManagedObj)
+        {
+        }
+
+        public void CleanUpNativeData(IntPtr pNativeData)
+            => Marshal.FreeHGlobal(pNativeData);
+
+        public int GetNativeDataSize() => -1;
+
+        public IntPtr MarshalManagedToNative(object managedObj)
+        {
+            if (managedObj == null)
+                return IntPtr.Zero;
+            if (!(managedObj is string))
+                throw new MarshalDirectiveException("UTF8Marshaler must be used on a string.");
+
+            return MarshalUtil.StringToPtr((string) managedObj);
+        }
+
+        public object MarshalNativeToManaged(IntPtr str)
+        {
+            if (str == IntPtr.Zero)
+                return null;
+            return MarshalUtil.PtrToString(str);
+        }
+
+        public static ICustomMarshaler GetInstance(string pstrCookie)
+        {
+            if (marshaler == null)
+                marshaler = new UTF8Marshaller();
+            return marshaler;
+        }
+
+        private static UTF8Marshaller marshaler;
+    }
+
+    public class PtrManager
+    {
+        public IntPtr ptr;
+        private bool freed = false;
+
+        public PtrManager(byte[] a)
+        {
+            this.ptr = MarshalUtil.ByteArrayToNative(a);
+        }
+
+        public void Free()
+        {
+            if (freed) return;
+            freed = true;
+            Marshal.FreeHGlobal(ptr);
+        }
+
+        ~PtrManager()
+        {
+            this.Free();
+        }
+    }
+
+    class PtrArray
+    {
+        public IntPtr[] a;
+        private bool freed = false;
+
+        public PtrArray(string[] a)
+        {
+            if (a == null)
+            {
+                a = Array.Empty<string>();
+            }
+
+            this.a = a.Select(x => MarshalUtil.StringToPtr(x)).ToArray();
+        }
+
+        public void Free()
+        {
+            if (freed) return;
+            freed = true;
+            foreach (var i in a)
+            {
+                Marshal.FreeHGlobal(i);
+            }
+        }
+
+        ~PtrArray()
+        {
+            this.Free();
+        }
+    }
+
+    public static class MarshalUtil
+    {
+        public static IntPtr StringToPtr(string s)
+        {
+            if (s == null) return IntPtr.Zero;
+            // not null terminated
+            byte[] strbuf = Encoding.UTF8.GetBytes(s);
+            IntPtr buffer = Marshal.AllocHGlobal(strbuf.Length + 1);
+            Marshal.Copy(strbuf, 0, buffer, strbuf.Length);
+
+            // write the terminating null
+            Marshal.WriteByte(buffer + strbuf.Length, 0);
+            return buffer;
+        }
+
+        public static string PtrToString(IntPtr p)
+        {
+            return GetString(Encoding.UTF8, p);
+        }
+
+        public static string GetString(Encoding encoding, IntPtr str)
+        {
+            if (str == IntPtr.Zero)
+                return null;
+
+            int byteCount = 0;
+
+            if (Equals(encoding, Encoding.UTF32))
+            {
+                while (Marshal.ReadInt32(str, byteCount) != 0) byteCount += sizeof(int);
+            }
+            else if (Equals(encoding, Encoding.Unicode) || Equals(encoding, Encoding.BigEndianUnicode))
+            {
+                while (Marshal.ReadInt16(str, byteCount) != 0) byteCount += sizeof(short);
+            }
+            else
+            {
+                while (Marshal.ReadByte(str, byteCount) != 0) byteCount += sizeof(byte);
+            }
+
+            var bytes = new byte[byteCount];
+            Marshal.Copy(str, bytes, 0, byteCount);
+            return encoding.GetString(bytes);
+        }
+
+        public static byte[] ByteArrayFromNative(IntPtr ptr, uint length)
+        {
+            var ans = new byte[length];
+            Marshal.Copy(ptr, ans, 0, (int) length);
+            return ans;
+        }
+
+        public static IntPtr ByteArrayToNative(byte[] a)
+        {
+            var ptr = Marshal.AllocHGlobal(a.Length);
+            Marshal.Copy(a, 0, ptr, a.Length);
+            return ptr;
+        }
+    }
+}