100 lines
2 KiB
C#
100 lines
2 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Runtime.InteropServices;
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using System.Text;
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using System.Threading.Tasks;
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namespace Mesen.GUI
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{
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public class Utf8Marshaler : ICustomMarshaler
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{
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static Utf8Marshaler _instance;
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public IntPtr MarshalManagedToNative(object managedObj)
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{
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if(managedObj == null) {
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return IntPtr.Zero;
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}
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if(!(managedObj is string)) {
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throw new MarshalDirectiveException("UTF8Marshaler must be used on a string.");
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}
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// not null terminated
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byte[] strbuf = Encoding.UTF8.GetBytes((string)managedObj);
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IntPtr buffer = Marshal.AllocHGlobal(strbuf.Length + 1);
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Marshal.Copy(strbuf, 0, buffer, strbuf.Length);
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// write the terminating null
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Marshal.WriteByte(buffer + strbuf.Length, 0);
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return buffer;
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}
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public object MarshalNativeToManaged(IntPtr pNativeData)
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{
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return GetStringFromIntPtr(pNativeData);
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}
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public void CleanUpNativeData(IntPtr pNativeData)
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{
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Marshal.FreeHGlobal(pNativeData);
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}
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public void CleanUpManagedData(object managedObj)
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{
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}
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public int GetNativeDataSize()
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{
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return -1;
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}
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public static ICustomMarshaler GetInstance(string cookie)
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{
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if(_instance == null) {
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return _instance = new Utf8Marshaler();
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}
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return _instance;
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}
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public static string GetStringFromIntPtr(IntPtr pNativeData)
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{
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int offset = 0;
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byte b = 0;
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do {
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b = Marshal.ReadByte(pNativeData, offset);
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offset++;
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} while(b != 0);
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int length = offset - 1;
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// should not be null terminated
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byte[] strbuf = new byte[length];
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// skip the trailing null
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Marshal.Copy((IntPtr)pNativeData, strbuf, 0, length);
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string data = Encoding.UTF8.GetString(strbuf);
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return data;
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}
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public static string PtrToStringUtf8(IntPtr ptr)
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{
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if(ptr == IntPtr.Zero) {
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return "";
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}
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int len = 0;
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while(Marshal.ReadByte(ptr, len) != 0) {
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len++;
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}
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if(len == 0) {
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return "";
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}
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byte[] array = new byte[len];
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Marshal.Copy(ptr, array, 0, len);
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return Encoding.UTF8.GetString(array);
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}
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}
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}
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