mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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413 lines
11 KiB
C#
413 lines
11 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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// Mike Kestner <mkestner@ximian.com>
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//
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// Copyright (c) 2002, 2003 Rachel Hestilow
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// Copyright (c) 2004 Novell, Inc.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of version 2 of the Lesser GNU General
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// Public License as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this program; if not, write to the
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// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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// Boston, MA 02111-1307, USA.
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namespace Gst.GLib {
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using System;
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using System.Runtime.InteropServices;
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public class Marshaller {
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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 void Free (IntPtr ptr)
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{
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g_free (ptr);
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}
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public static void Free (IntPtr[] ptrs)
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{
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if (ptrs == null)
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return;
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for (int i = 0; i < ptrs.Length; i++)
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g_free (ptrs [i]);
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}
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[DllImport("libglib-2.0-0.dll")]
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static extern IntPtr g_filename_to_utf8 (IntPtr mem, int len, IntPtr read, out IntPtr written, out IntPtr error);
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public static string FilenamePtrToString (IntPtr ptr)
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{
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if (ptr == IntPtr.Zero) return null;
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IntPtr dummy, error;
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IntPtr utf8 = g_filename_to_utf8 (ptr, -1, IntPtr.Zero, out dummy, out error);
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if (error != IntPtr.Zero)
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throw new GLib.GException (error);
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return Utf8PtrToString (utf8);
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}
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public static string FilenamePtrToStringGFree (IntPtr ptr)
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{
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string ret = FilenamePtrToString (ptr);
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g_free (ptr);
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return ret;
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}
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static unsafe ulong strlen (IntPtr s)
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{
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ulong cnt = 0;
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byte *b = (byte *)s;
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while (*b != 0) {
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b++;
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cnt++;
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}
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return cnt;
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}
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public static string Utf8PtrToString (IntPtr ptr)
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{
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if (ptr == IntPtr.Zero)
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return null;
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int len = (int) (uint) strlen (ptr);
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byte[] bytes = new byte [len];
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Marshal.Copy (ptr, bytes, 0, len);
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return System.Text.Encoding.UTF8.GetString (bytes);
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}
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public static string[] Utf8PtrToString (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] = Utf8PtrToString (ptrs[i]);
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return ret;
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}
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public static string PtrToStringGFree (IntPtr ptr)
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{
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string ret = Utf8PtrToString (ptr);
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g_free (ptr);
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return ret;
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}
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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] = Utf8PtrToString (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_filename_from_utf8 (IntPtr mem, int len, IntPtr read, out IntPtr written, out IntPtr error);
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public static IntPtr StringToFilenamePtr (string str)
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{
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if (str == null)
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return IntPtr.Zero;
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IntPtr dummy, error;
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IntPtr utf8 = StringToPtrGStrdup (str);
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IntPtr result = g_filename_from_utf8 (utf8, -1, IntPtr.Zero, out dummy, out error);
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g_free (utf8);
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if (error != IntPtr.Zero)
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throw new GException (error);
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return result;
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}
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public static IntPtr StringToPtrGStrdup (string str) {
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if (str == null)
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return IntPtr.Zero;
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byte[] bytes = System.Text.Encoding.UTF8.GetBytes (str);
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IntPtr result = g_malloc (new UIntPtr ((ulong)bytes.Length + 1));
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Marshal.Copy (bytes, 0, result, bytes.Length);
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Marshal.WriteByte (result, bytes.Length, 0);
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return result;
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}
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public static string StringFormat (string format, params object[] args) {
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string ret = String.Format (format, args);
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if (ret.IndexOf ('%') == -1)
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return ret;
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else
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return ret.Replace ("%", "%%");
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}
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public static IntPtr[] StringArrayToNullTermPointer (string[] strs)
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{
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if (strs == null)
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return null;
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IntPtr[] result = new IntPtr [strs.Length + 1];
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for (int i = 0; i < strs.Length; i++)
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result [i] = StringToPtrGStrdup (strs [i]);
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result [strs.Length] = IntPtr.Zero;
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return result;
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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 void StrFreeV (IntPtr null_term_array)
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{
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g_strfreev (null_term_array);
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}
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public static string[] NullTermPtrToStringArray (IntPtr null_term_array, bool owned)
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{
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if (null_term_array == IntPtr.Zero)
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return new string [0];
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int count = 0;
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System.Collections.ArrayList result = new System.Collections.ArrayList ();
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IntPtr s = Marshal.ReadIntPtr (null_term_array, count++ * IntPtr.Size);
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while (s != IntPtr.Zero) {
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result.Add (Utf8PtrToString (s));
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s = Marshal.ReadIntPtr (null_term_array, count++ * IntPtr.Size);
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}
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if (owned)
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g_strfreev (null_term_array);
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return (string[]) result.ToArray (typeof(string));
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}
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public static string[] PtrToStringArrayGFree (IntPtr string_array)
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{
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if (string_array == IntPtr.Zero)
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return new string [0];
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int count = 0;
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while (Marshal.ReadIntPtr (string_array, count*IntPtr.Size) != IntPtr.Zero)
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++count;
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string[] members = new string[count];
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for (int i = 0; i < count; ++i) {
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IntPtr s = Marshal.ReadIntPtr (string_array, i * IntPtr.Size);
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members[i] = GLib.Marshaller.PtrToStringGFree (s);
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}
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GLib.Marshaller.Free (string_array);
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return members;
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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(UIntPtr size);
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public static IntPtr Malloc (ulong size)
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{
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return g_malloc (new UIntPtr (size));
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}
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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 (new UIntPtr ((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 (new UIntPtr ((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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[Obsolete ("Use GLib.Argv instead to avoid leaks.")]
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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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[Obsolete ("Use GLib.Argv instead to avoid leaks.")]
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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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static DateTime local_epoch = new DateTime (1970, 1, 1, 0, 0, 0);
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static int utc_offset = (int) (TimeZone.CurrentTimeZone.GetUtcOffset (DateTime.Now)).TotalSeconds;
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public static IntPtr DateTimeTotime_t (DateTime time)
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{
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return new IntPtr (((long)time.Subtract (local_epoch).TotalSeconds) - utc_offset);
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}
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public static DateTime time_tToDateTime (IntPtr time_t)
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{
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return local_epoch.AddSeconds (time_t.ToInt64 () + utc_offset);
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}
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[DllImport("libglib-2.0-0.dll")]
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static extern IntPtr g_malloc0 (UIntPtr size);
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[DllImport("libglib-2.0-0.dll")]
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static extern int g_unichar_to_utf8 (uint c, IntPtr buf);
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public static char GUnicharToChar (uint ucs4_char)
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{
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if (ucs4_char == 0)
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return (char) 0;
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string ret = GUnicharToString (ucs4_char);
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if (ret.Length != 1)
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throw new ArgumentOutOfRangeException ("ucs4char is not representable by a char.");
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return ret [0];
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}
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public static string GUnicharToString (uint ucs4_char)
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{
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if (ucs4_char == 0)
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return String.Empty;
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IntPtr buf = g_malloc0 (new UIntPtr (7));
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g_unichar_to_utf8 (ucs4_char, buf);
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return PtrToStringGFree (buf);
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}
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[DllImport("libglib-2.0-0.dll")]
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static extern IntPtr g_utf16_to_ucs4 (ref ushort c, IntPtr len, IntPtr d1, IntPtr d2, IntPtr d3);
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public static uint CharToGUnichar (char c)
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{
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ushort val = (ushort) c;
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IntPtr ucs4_str = g_utf16_to_ucs4 (ref val, new IntPtr (1), IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);
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uint result = (uint) Marshal.ReadInt32 (ucs4_str);
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g_free (ucs4_str);
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return result;
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}
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public static IntPtr StructureToPtrAlloc (object o)
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{
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IntPtr result = Marshal.AllocHGlobal (Marshal.SizeOf (o));
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Marshal.StructureToPtr (o, result, false);
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return result;
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}
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public static Array ListPtrToArray (IntPtr list_ptr, Type list_type, bool owned, bool elements_owned, Type elem_type)
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{
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Type array_type = elem_type == typeof (ListBase.FilenameString) ? typeof (string) : elem_type;
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ListBase list;
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if (list_type == typeof(GLib.List))
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list = new GLib.List (list_ptr, elem_type, owned, elements_owned);
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else
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list = new GLib.SList (list_ptr, elem_type, owned, elements_owned);
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using (list)
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return ListToArray (list, array_type);
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}
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public static Array PtrArrayToArray (IntPtr list_ptr, bool owned, bool elements_owned, Type elem_type)
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{
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GLib.PtrArray array = new GLib.PtrArray (list_ptr, elem_type, owned, elements_owned);
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Array ret = Array.CreateInstance (elem_type, array.Count);
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array.CopyTo (ret, 0);
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array.Dispose ();
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return ret;
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}
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public static Array ListToArray (ListBase list, System.Type type)
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{
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Array result = Array.CreateInstance (type, list.Count);
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if (list.Count > 0)
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list.CopyTo (result, 0);
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if (type.IsSubclassOf (typeof (GLib.Opaque)))
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list.elements_owned = false;
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return result;
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}
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}
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}
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