| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| using System; |
| using System.Diagnostics.CodeAnalysis; |
| using System.Runtime.InteropServices; |
| using System.Text; |
| |
| namespace Apache.Arrow.Adbc.Extensions |
| { |
| public static class MarshalExtensions |
| { |
| #if NETSTANDARD |
| public static unsafe string? PtrToStringUTF8(IntPtr intPtr) |
| { |
| if (intPtr == IntPtr.Zero) |
| { |
| return null; |
| } |
| |
| byte* source = (byte*)intPtr; |
| int length = 0; |
| |
| while (source[length] != 0) |
| { |
| length++; |
| } |
| |
| byte[] bytes = new byte[length]; |
| Marshal.Copy(intPtr, bytes, 0, length); |
| |
| return Encoding.UTF8.GetString(bytes); |
| } |
| |
| public static TDelegate GetDelegateForFunctionPointer<TDelegate>(IntPtr ptr) |
| { |
| return (TDelegate)(object)Marshal.GetDelegateForFunctionPointer(ptr, typeof(TDelegate)); |
| } |
| |
| public static unsafe IntPtr StringToCoTaskMemUTF8(string? s) |
| { |
| if (s is null) |
| { |
| return IntPtr.Zero; |
| } |
| |
| int nb = Encoding.UTF8.GetMaxByteCount(s.Length); |
| |
| IntPtr pMem = Marshal.AllocHGlobal(nb + 1); |
| |
| int nbWritten; |
| byte* pbMem = (byte*)pMem; |
| |
| fixed (char* firstChar = s) |
| { |
| nbWritten = Encoding.UTF8.GetBytes(firstChar, s.Length, pbMem, nb); |
| } |
| |
| pbMem[nbWritten] = 0; |
| |
| return pMem; |
| } |
| #else |
| public static unsafe string? PtrToStringUTF8(IntPtr intPtr) |
| { |
| return Marshal.PtrToStringUTF8(intPtr); |
| } |
| |
| public static IntPtr StringToCoTaskMemUTF8(string? s) |
| { |
| return Marshal.StringToCoTaskMemUTF8(s); |
| } |
| #endif |
| |
| public static unsafe string? PtrToStringUTF8(byte* ptr) |
| { |
| return PtrToStringUTF8((IntPtr)ptr); |
| } |
| |
| public static unsafe byte[]? MarshalBuffer(void* ptr, int size) |
| { |
| if (ptr == null) |
| { |
| return null; |
| } |
| |
| byte[] bytes = new byte[size]; |
| fixed (byte* firstByte = bytes) |
| { |
| Buffer.MemoryCopy(ptr, firstByte, size, size); |
| } |
| |
| return bytes; |
| } |
| } |
| } |