mirror of
https://github.com/Ryujinx/GtkSharp.git
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159 lines
3.7 KiB
C#
159 lines
3.7 KiB
C#
// GLibSharp.Marshaller.cs : Marshalling utils
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//
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// Author: Rachel Hestilow <rachel@nullenvoid.com>
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//
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// (c) 2002, 2003 Rachel Hestilow
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namespace GLibSharp {
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using System;
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using System.Runtime.InteropServices;
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/// <summary>
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/// Marshalling utilities
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/// </summary>
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///
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/// <remarks>
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/// Utility class for internal wrapper use
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/// </remarks>
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public class Marshaller {
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//
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// Do not allow instances of this
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//
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private Marshaller () {}
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[DllImport("libglib-2.0-0.dll")]
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static extern void g_free (IntPtr mem);
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public static string PtrToStringGFree (IntPtr ptr) {
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string ret = Marshal.PtrToStringAnsi (ptr);
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g_free (ptr);
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return ret;
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}
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[DllImport("libglib-2.0-0.dll")]
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static extern void g_strfreev (IntPtr mem);
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public static string[] PtrToStringGFree (IntPtr[] ptrs) {
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// The last pointer is a null terminator.
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string[] ret = new string[ptrs.Length - 1];
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for (int i = 0; i < ret.Length; i++) {
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ret[i] = Marshal.PtrToStringAnsi (ptrs[i]);
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g_free (ptrs[i]);
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}
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return ret;
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}
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[DllImport("libglib-2.0-0.dll")]
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static extern IntPtr g_strdup (string str);
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public static IntPtr StringToPtrGStrdup (string str) {
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return g_strdup (str);
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}
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// Argv marshalling -- unpleasantly complex, but
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// don't know of a better way to do it.
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//
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// Currently, the 64-bit cleanliness is
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// hypothetical. It's also ugly, but I don't know of a
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// construct to handle both 32 and 64 bitness
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// transparently, since we need to alloc buffers of
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// [native pointer size] * [count] bytes.
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[DllImport("libglib-2.0-0.dll")]
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static extern IntPtr g_malloc(ulong size);
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static bool check_sixtyfour () {
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int szint = Marshal.SizeOf (typeof (int));
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int szlong = Marshal.SizeOf (typeof (long));
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int szptr = IntPtr.Size;
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if (szptr == szint)
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return false;
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if (szptr == szlong)
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return true;
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throw new Exception ("Pointers are neither int- nor long-sized???");
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}
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static IntPtr make_buf_32 (string[] args)
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{
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int[] ptrs = new int[args.Length];
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for (int i = 0; i < args.Length; i++)
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ptrs[i] = (int) Marshal.StringToHGlobalAuto (args[i]);
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IntPtr buf = g_malloc ((ulong) Marshal.SizeOf(typeof(int)) *
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(ulong) args.Length);
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Marshal.Copy (ptrs, 0, buf, ptrs.Length);
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return buf;
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}
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static IntPtr make_buf_64 (string[] args)
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{
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long[] ptrs = new long[args.Length];
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for (int i = 0; i < args.Length; i++)
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ptrs[i] = (long) Marshal.StringToHGlobalAuto (args[i]);
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IntPtr buf = g_malloc ((ulong) Marshal.SizeOf(typeof(long)) *
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(ulong) args.Length);
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Marshal.Copy (ptrs, 0, buf, ptrs.Length);
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return buf;
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}
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public static IntPtr ArgvToArrayPtr (string[] args)
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{
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if (args.Length == 0)
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return IntPtr.Zero;
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if (check_sixtyfour ())
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return make_buf_64 (args);
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return make_buf_32 (args);
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}
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// should we be freeing these pointers? they're marshalled
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// from our own strings, so I think not ...
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static string[] unmarshal_32 (IntPtr buf, int argc)
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{
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int[] ptrs = new int[argc];
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string[] args = new string[argc];
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Marshal.Copy (buf, ptrs, 0, argc);
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for (int i = 0; i < ptrs.Length; i++)
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args[i] = Marshal.PtrToStringAuto ((IntPtr) ptrs[i]);
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return args;
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}
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static string[] unmarshal_64 (IntPtr buf, int argc)
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{
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long[] ptrs = new long[argc];
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string[] args = new string[argc];
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Marshal.Copy (buf, ptrs, 0, argc);
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for (int i = 0; i < ptrs.Length; i++)
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args[i] = Marshal.PtrToStringAuto ((IntPtr) ptrs[i]);
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return args;
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}
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public static string[] ArrayPtrToArgv (IntPtr array, int argc)
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{
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if (argc == 0)
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return new string[0];
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if (check_sixtyfour ())
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return unmarshal_64 (array, argc);
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return unmarshal_32 (array, argc);
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}
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}
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}
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