GtkSharp/glib/Marshaller.cs
Mike Kestner 9001c6fa25 2005-03-29 Mike Kestner <mkestner@novell.com>
* glib/Marshaller.cs : special case ucs4 "0" conversion.
	[Fixes #74175]

svn path=/trunk/gtk-sharp/; revision=42337
2005-03-29 15:28:02 +00:00

242 lines
6.5 KiB
C#

// GLibSharp.Marshaller.cs : Marshalling utils
//
// Author: Rachel Hestilow <rachel@nullenvoid.com>
// Mike Kestner <mkestner@ximian.com>
//
// Copyright (c) 2002, 2003 Rachel Hestilow
// Copyright (c) 2004 Novell, Inc.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of version 2 of the Lesser GNU General
// Public License as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this program; if not, write to the
// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
namespace GLib {
using System;
using System.Runtime.InteropServices;
public class Marshaller {
private Marshaller () {}
[DllImport("libglib-2.0-0.dll")]
static extern void g_free (IntPtr mem);
public static void Free (IntPtr ptr)
{
g_free (ptr);
}
[DllImport("glibsharpglue-2")]
static extern UIntPtr glibsharp_strlen (IntPtr mem);
public static string Utf8PtrToString (IntPtr ptr)
{
if (ptr == IntPtr.Zero)
return null;
int len = (int) (uint)glibsharp_strlen (ptr);
byte[] bytes = new byte [len];
Marshal.Copy (ptr, bytes, 0, len);
return System.Text.Encoding.UTF8.GetString (bytes);
}
public static string PtrToStringGFree (IntPtr ptr)
{
string ret = Utf8PtrToString (ptr);
g_free (ptr);
return ret;
}
[DllImport("libglib-2.0-0.dll")]
static extern void g_strfreev (IntPtr mem);
public static string[] PtrToStringGFree (IntPtr[] ptrs) {
// The last pointer is a null terminator.
string[] ret = new string[ptrs.Length - 1];
for (int i = 0; i < ret.Length; i++) {
ret[i] = Utf8PtrToString (ptrs[i]);
g_free (ptrs[i]);
}
return ret;
}
public static IntPtr StringToPtrGStrdup (string str) {
if (str == null)
return IntPtr.Zero;
byte[] bytes = System.Text.Encoding.UTF8.GetBytes (str);
IntPtr result = g_malloc (new UIntPtr ((ulong)bytes.Length + 1));
Marshal.Copy (bytes, 0, result, bytes.Length);
Marshal.WriteByte (result, bytes.Length, 0);
return result;
}
public static string StringFormat (string format, params object[] args) {
string ret = String.Format (format, args);
if (ret.IndexOf ('%') == -1)
return ret;
else
return ret.Replace ("%", "%%");
}
// Argv marshalling -- unpleasantly complex, but
// don't know of a better way to do it.
//
// Currently, the 64-bit cleanliness is
// hypothetical. It's also ugly, but I don't know of a
// construct to handle both 32 and 64 bitness
// transparently, since we need to alloc buffers of
// [native pointer size] * [count] bytes.
[DllImport("libglib-2.0-0.dll")]
static extern IntPtr g_malloc(UIntPtr size);
static bool check_sixtyfour () {
int szint = Marshal.SizeOf (typeof (int));
int szlong = Marshal.SizeOf (typeof (long));
int szptr = IntPtr.Size;
if (szptr == szint)
return false;
if (szptr == szlong)
return true;
throw new Exception ("Pointers are neither int- nor long-sized???");
}
static IntPtr make_buf_32 (string[] args)
{
int[] ptrs = new int[args.Length];
for (int i = 0; i < args.Length; i++)
ptrs[i] = (int) Marshal.StringToHGlobalAuto (args[i]);
IntPtr buf = g_malloc (new UIntPtr ((ulong) Marshal.SizeOf(typeof(int)) *
(ulong) args.Length));
Marshal.Copy (ptrs, 0, buf, ptrs.Length);
return buf;
}
static IntPtr make_buf_64 (string[] args)
{
long[] ptrs = new long[args.Length];
for (int i = 0; i < args.Length; i++)
ptrs[i] = (long) Marshal.StringToHGlobalAuto (args[i]);
IntPtr buf = g_malloc (new UIntPtr ((ulong) Marshal.SizeOf(typeof(long)) *
(ulong) args.Length));
Marshal.Copy (ptrs, 0, buf, ptrs.Length);
return buf;
}
[Obsolete ("Use GLib.Argv instead to avoid leaks.")]
public static IntPtr ArgvToArrayPtr (string[] args)
{
if (args.Length == 0)
return IntPtr.Zero;
if (check_sixtyfour ())
return make_buf_64 (args);
return make_buf_32 (args);
}
// should we be freeing these pointers? they're marshalled
// from our own strings, so I think not ...
static string[] unmarshal_32 (IntPtr buf, int argc)
{
int[] ptrs = new int[argc];
string[] args = new string[argc];
Marshal.Copy (buf, ptrs, 0, argc);
for (int i = 0; i < ptrs.Length; i++)
args[i] = Marshal.PtrToStringAuto ((IntPtr) ptrs[i]);
return args;
}
static string[] unmarshal_64 (IntPtr buf, int argc)
{
long[] ptrs = new long[argc];
string[] args = new string[argc];
Marshal.Copy (buf, ptrs, 0, argc);
for (int i = 0; i < ptrs.Length; i++)
args[i] = Marshal.PtrToStringAuto ((IntPtr) ptrs[i]);
return args;
}
[Obsolete ("Use GLib.Argv instead to avoid leaks.")]
public static string[] ArrayPtrToArgv (IntPtr array, int argc)
{
if (argc == 0)
return new string[0];
if (check_sixtyfour ())
return unmarshal_64 (array, argc);
return unmarshal_32 (array, argc);
}
static DateTime local_epoch = new DateTime (1970, 1, 1, 0, 0, 0);
static int utc_offset = (int) (TimeZone.CurrentTimeZone.GetUtcOffset (DateTime.Now)).TotalSeconds;
public static IntPtr DateTimeTotime_t (DateTime time)
{
return new IntPtr (((int)time.Subtract (local_epoch).TotalSeconds));
}
public static DateTime time_tToDateTime (IntPtr time_t)
{
return local_epoch.AddSeconds ((int)time_t + utc_offset);
}
[DllImport("glibsharpglue-2")]
static extern IntPtr gtksharp_unichar_to_utf8_string (uint c);
public static char GUnicharToChar (uint ucs4_char)
{
if (ucs4_char == 0)
return (char) 0;
IntPtr raw_ret = gtksharp_unichar_to_utf8_string (ucs4_char);
string ret = GLib.Marshaller.PtrToStringGFree(raw_ret);
if (ret.Length > 1)
throw new ArgumentOutOfRangeException ("ucs4char is not representable by a char.");
return ret [0];
}
[DllImport("glibsharpglue-2")]
static extern uint glibsharp_utf16_to_unichar (ushort c);
public static uint CharToGUnichar (char c)
{
return glibsharp_utf16_to_unichar ((ushort) c);
}
public static IntPtr PtrToStructureAlloc (object o)
{
IntPtr result = Marshal.AllocHGlobal (Marshal.SizeOf (o));
Marshal.StructureToPtr (o, result, false);
return result;
}
}
}