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Copy pathCustomMarshaler.cs
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171 lines (148 loc) · 4.83 KB
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using System;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
namespace Python.Runtime
{
/// <summary>
/// Abstract class defining boiler plate methods that
/// Custom Marshalers will use.
/// </summary>
internal abstract class MarshalerBase : ICustomMarshaler
{
public object MarshalNativeToManaged(IntPtr pNativeData)
{
throw new NotImplementedException();
}
public abstract IntPtr MarshalManagedToNative(object managedObj);
public void CleanUpNativeData(IntPtr pNativeData)
{
Marshal.FreeHGlobal(pNativeData);
}
public void CleanUpManagedData(object managedObj)
{
// Let GC deal with it
}
public int GetNativeDataSize()
{
return IntPtr.Size;
}
}
/// <summary>
/// Custom Marshaler to deal with Managed String to Native
/// conversion differences on UCS2/UCS4.
/// </summary>
internal class UcsMarshaler : MarshalerBase
{
internal static readonly int _UCS = RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? 2 : 4;
internal static readonly Encoding PyEncoding = _UCS == 2 ? Encodings.UTF16 : Encodings.UTF32;
private static readonly MarshalerBase Instance = new UcsMarshaler();
public override IntPtr MarshalManagedToNative(object managedObj)
{
if (managedObj is not string s)
{
return IntPtr.Zero;
}
byte[] bStr = PyEncoding.GetBytes(s + "\0");
IntPtr mem = Marshal.AllocHGlobal(bStr.Length);
try
{
Marshal.Copy(bStr, 0, mem, bStr.Length);
}
catch (Exception)
{
Marshal.FreeHGlobal(mem);
throw;
}
return mem;
}
public static ICustomMarshaler GetInstance(string cookie)
{
return Instance;
}
public static string? PtrToString(IntPtr p)
{
if (p == IntPtr.Zero)
{
return null;
}
int size = GetUnicodeByteLength(p);
var buffer = new byte[size];
Marshal.Copy(p, buffer, 0, size);
return PyEncoding.GetString(buffer, 0, size);
}
public static int GetUnicodeByteLength(IntPtr p)
{
var len = 0;
while (true)
{
int c = _UCS == 2
? Marshal.ReadInt16(p, len * 2)
: Marshal.ReadInt32(p, len * 4);
if (c == 0)
{
return len * _UCS;
}
checked
{
++len;
}
}
}
/// <summary>
/// Utility function for Marshaling Unicode
/// </summary>
/// <param name="s">Managed String</param>
/// <returns>
/// Ptr to Native String
/// </returns>
/// <remarks>
/// You MUST deallocate the IntPtr of the Return when done with it.
/// </remarks>
public static IntPtr StringToPtr(string s)
{
return Instance.MarshalManagedToNative(s);
}
}
/// <summary>
/// Custom Marshaler to deal with Managed String Arrays to Native
/// conversion differences on UCS2/UCS4.
/// </summary>
internal class StrArrayMarshaler : MarshalerBase
{
private static readonly MarshalerBase Instance = new StrArrayMarshaler();
private static readonly Encoding PyEncoding = UcsMarshaler.PyEncoding;
public override IntPtr MarshalManagedToNative(object managedObj)
{
if (managedObj is not string[] argv)
{
return IntPtr.Zero;
}
int totalStrLength = argv.Sum(arg => arg.Length + 1);
int memSize = argv.Length * IntPtr.Size + totalStrLength * UcsMarshaler._UCS;
IntPtr mem = Marshal.AllocHGlobal(memSize);
try
{
// Preparing array of pointers to strings
IntPtr curStrPtr = mem + argv.Length * IntPtr.Size;
for (var i = 0; i < argv.Length; i++)
{
byte[] bStr = PyEncoding.GetBytes(argv[i] + "\0");
Marshal.Copy(bStr, 0, curStrPtr, bStr.Length);
Marshal.WriteIntPtr(mem + i * IntPtr.Size, curStrPtr);
curStrPtr += bStr.Length;
}
}
catch (Exception)
{
Marshal.FreeHGlobal(mem);
throw;
}
return mem;
}
public static ICustomMarshaler GetInstance(string? cookie)
{
return Instance;
}
}
}