/*
	bi_file.c

	CSQC file builtins

	Copyright (C) 1996-1997  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:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

static __attribute__ ((unused)) const char rcsid[] = 
	"$Id$";

#include <stdlib.h>
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif

#include "QF/csqc.h"
#include "QF/progs.h"
#include "QF/quakefs.h"
#include "QF/va.h"
#include "QF/zone.h"

static void
check_buffer (progs_t *pr, pr_type_t *buf, int count, const char *name)
{
	int         len;

	len = (count + sizeof (pr_type_t) - 1) / sizeof (pr_type_t);
	if (buf < pr->pr_globals || buf + len > pr->pr_globals + pr->globals_size)
		PR_RunError (pr, "%s: bad buffer", name);
}


static void
bi_QFS_Rename (progs_t *pr)
{
	const char *old = P_GSTRING (pr, 0);
	const char *new = P_GSTRING (pr, 1);

	R_INT (pr) = QFS_Rename (old, new);
}

static void
bi_QFS_LoadFile (progs_t *pr)
{
	const char *filename = P_GSTRING (pr, 0);
	QFile      *file;
	int         size;
	void       *buffer;

	QFS_FOpenFile (filename, &file);
	if (!file) {
		RETURN_POINTER (pr, 0);
		return;
	}
	size = Qfilesize (file);
	buffer = PR_Zone_Malloc (pr, (size + 3) & ~3);
	if (!buffer) {
		Qclose (file);
		RETURN_POINTER (pr, 0);
		return;
	}
	Qread (file, buffer, size);
	Qclose (file);
	RETURN_POINTER (pr, buffer);
}

static void
bi_QFS_OpenFile (progs_t *pr)
{
	qfile_resources_t *res = PR_Resources_Find (pr, "QFile");
	QFile     **file = QFile_AllocHandle (pr, res);
	const char *filename = P_GSTRING (pr, 0);

	QFS_FOpenFile (filename, file);
	if (!*file) {
		RETURN_POINTER (pr, 0);
		return;
	}
	R_INT (pr) = (file - res->handles) + 1;
}

static void
bi_QFS_WriteFile (progs_t *pr)
{
	const char *filename = P_GSTRING (pr, 0);
	pr_type_t  *buf = P_GPOINTER (pr, 1);
	int         count = P_INT (pr, 2);

	check_buffer (pr, buf, count, "QFS_WriteFile");
	QFS_WriteFile (va ("%s/%s", qfs_gamedir->dir.def, filename), buf, count);
}

void
QFS_Progs_Init (progs_t *pr)
{
	PR_AddBuiltin (pr, "QFS_Rename", bi_QFS_Rename, -1);
	PR_AddBuiltin (pr, "QFS_LoadFile", bi_QFS_LoadFile, -1);
	PR_AddBuiltin (pr, "QFS_OpenFile", bi_QFS_OpenFile, -1);
	PR_AddBuiltin (pr, "QFS_WriteFile", bi_QFS_WriteFile, -1);
}