Add memory handling functions in mem.c

This code was taken from ioQuake2, refactored into an own file and
altered for the inclusion in Yamagi Quake II.

Makefile

@@ -488,6 +488,7 @@ SERVER_OBJS_ := \
 ifeq ($(OSTYPE), Windows)
 SERVER_OBJS_ += \
 	src/windows/conproc.o \
+	src/windows/mem.o \
 	src/windows/system.o	
 else
 SERVER_OBJS_ += \

src/windows/mem.c

@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 1997-2001 Id Software, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU 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.
+ *
+ * =======================================================================
+ *
+ * Memory handling functions.
+ *
+ * =======================================================================
+ */
+
+#include "../common/header/common.h"
+#include "header/winquake.h"
+
+byte *membase;
+int hunkcount;
+int hunkmaxsize;
+int cursize;
+
+void *
+Hunk_Begin(int maxsize)
+{
+	/* reserve a huge chunk of memory, 
+	   but don't commit any yet */
+	cursize = 0;
+	hunkmaxsize = maxsize;
+	membase = VirtualAlloc(NULL, maxsize, MEM_RESERVE, PAGE_NOACCESS);
+
+	if (!membase)
+	{
+		Sys_Error("VirtualAlloc reserve failed");
+	}
+
+	return (void *)membase;
+}
+
+void *
+Hunk_Alloc(int size)
+{
+	void *buf;
+
+	/* round to cacheline */
+	size = (size + 31) & ~31;
+
+	/* commit pages as needed */
+	buf = VirtualAlloc(membase, cursize + size, MEM_COMMIT, PAGE_READWRITE);
+
+	if (!buf)
+	{
+		FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
+				NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+				(LPTSTR)&buf, 0, NULL);
+		Sys_Error("VirtualAlloc commit failed.\n%s", buf);
+	}
+
+	cursize += size;
+
+	if (cursize > hunkmaxsize)
+	{
+		Sys_Error("Hunk_Alloc overflow");
+	}
+
+	return (void *)(membase + cursize - size);
+}
+
+int
+Hunk_End(void)
+{
+	hunkcount++;
+
+	return cursize;
+}
+
+void
+Hunk_Free(void *base)
+{
+	if (base)
+	{
+		VirtualFree(base, 0, MEM_RELEASE);
+	}
+
+	hunkcount--;
+}
+