Implement system depended file handling

Those functions were taken from ioQuake2 and refactored to match Yamagi
Quake II.

src/windows/system.c

@@ -57,6 +57,10 @@ unsigned int sys_frame_time;
 static char console_text[256];
 static int console_textlen;  
 
+char findbase[MAX_OSPATH];
+char findpath[MAX_OSPATH];
+int findhandle;
+
 int argc;
 char *argv[MAX_NUM_ARGVS];
 
@@ -506,6 +510,134 @@ Sys_Milliseconds(void)
 
 /* ======================================================================= */
 
+static qboolean
+CompareAttributes(unsigned found, unsigned musthave, unsigned canthave)
+{
+	if ((found & _A_RDONLY) && (canthave & SFF_RDONLY))
+	{
+		return false;
+	}
+
+	if ((found & _A_HIDDEN) && (canthave & SFF_HIDDEN))
+	{
+		return false;
+	}
+
+	if ((found & _A_SYSTEM) && (canthave & SFF_SYSTEM))
+	{
+		return false;
+	}
+
+	if ((found & _A_SUBDIR) && (canthave & SFF_SUBDIR))
+	{
+		return false;
+	}
+
+	if ((found & _A_ARCH) && (canthave & SFF_ARCH))
+	{
+		return false;
+	}
+
+	if ((musthave & SFF_RDONLY) && !(found & _A_RDONLY))
+	{
+		return false;
+	}
+
+	if ((musthave & SFF_HIDDEN) && !(found & _A_HIDDEN))
+	{
+		return false;
+	}
+
+	if ((musthave & SFF_SYSTEM) && !(found & _A_SYSTEM))
+	{
+		return false;
+	}
+
+	if ((musthave & SFF_SUBDIR) && !(found & _A_SUBDIR))
+	{
+		return false;
+	}
+
+	if ((musthave & SFF_ARCH) && !(found & _A_ARCH))
+	{
+		return false;
+	}
+
+	return true;
+}
+
+char *
+Sys_FindFirst(char *path, unsigned musthave, unsigned canthave)
+{
+	struct _finddata_t findinfo;
+
+	if (findhandle)
+	{
+		Sys_Error("Sys_BeginFind without close");
+	}
+
+	findhandle = 0;
+
+	COM_FilePath(path, findbase);
+	findhandle = _findfirst(path, &findinfo);
+
+	if (findhandle == -1)
+	{
+		return NULL;
+	}
+
+	if (!CompareAttributes(findinfo.attrib, musthave, canthave))
+	{
+		return NULL;
+	}
+
+	Com_sprintf(findpath, sizeof(findpath), "%s/%s", findbase, findinfo.name);
+	return findpath;
+}
+
+char *
+Sys_FindNext(unsigned musthave, unsigned canthave)
+{
+	struct _finddata_t findinfo;
+
+	if (findhandle == -1)
+	{
+		return NULL;
+	}
+
+	if (_findnext(findhandle, &findinfo) == -1)
+	{
+		return NULL;
+	}
+
+	if (!CompareAttributes(findinfo.attrib, musthave, canthave))
+	{
+		return NULL;
+	}
+
+	Com_sprintf(findpath, sizeof(findpath), "%s/%s", findbase, findinfo.name);
+	return findpath;
+}
+
+void
+Sys_FindClose(void)
+{
+	if (findhandle != -1)
+	{
+		_findclose(findhandle);
+	}
+
+	findhandle = 0;
+} 
+
+void
+Sys_Mkdir(char *path)
+{
+	_mkdir(path);
+}
+
+/* ======================================================================= */
+
 /*
  * Windows main function. Containts the 
  * initialization code and the main loop