Snapsho routines

1 files changed, 176 insertions, 0 deletions

diff --git a/source/snapshot.c b/source/snapshot.c
new file mode 100644
index 0000000..f5a8b9c
--- /dev/null
+++ b/source/snapshot.c
@@ -0,0 +1,176 @@
+/*
+    ds81 - Nintendo DS ZX81 emulator
+
+    Copyright (C) 2006  Ian Cowburn <ianc@noddybox.co.uk>
+
+    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
+
+    -------------------------------------------------------------------------
+
+    Provides the routines for snapshotting.
+
+*/
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <nds.h>
+
+#include "zx81.h"
+#include "gui.h"
+
+#include "config.h"
+
+#include "ds81_debug.h"
+
+#ifndef TRUE
+#define TRUE 1
+#endif
+
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+
+/* ---------------------------------------- STATICS
+*/
+static int		enabled;
+static const char 	*magic = "V00_DS81";
+
+
+/* ---------------------------------------- PRIVATE FUNCTIONS
+*/
+static void WriteMagic(FILE *fp)
+{
+    const char *p = magic;
+
+    while(*p)
+    {
+    	fputc(*p++, fp);
+    }
+}
+
+static int CheckMagic(FILE *fp)
+{
+    const char *p = magic;
+
+    while(*p)
+    {
+	if (fgetc(fp) != *p++)
+	{
+	    return FALSE;
+	}
+    }
+
+    return TRUE;
+}
+
+
+/* ---------------------------------------- EXPORTED INTERFACES
+*/
+void SNAP_Enable(int enable)
+{
+    enabled = enable;
+}
+
+void SNAP_Save(Z80 *cpu)
+{
+    char base[FILENAME_MAX] = "";
+    char file[FILENAME_MAX];
+    FILE *fp = NULL;
+
+    if (!enabled)
+    {
+    	return;
+    }
+
+    if(!GUI_InputName(base, 8) || !base[0])
+    {
+    	return;
+    }
+
+    strcat(base, ".D81");
+
+    strcpy(file, DEFAULT_SNAPDIR);
+    strcat(file, base);
+
+    fp = fopen(file, "wb");
+
+    if (!fp)
+    {
+	fp = fopen(base, "wb");
+    }
+
+    if (fp)
+    {
+	WriteMagic(fp);
+	SK_SaveSnapshot(fp);
+	Z80SaveSnapshot(cpu, fp);
+	ZX81SaveSnapshot(fp);
+    	fclose(fp);
+    }
+}
+
+void SNAP_Load(Z80 *cpu, const char *optional_name)
+{
+    static char last_dir[FILENAME_MAX] = "/";
+    char file[FILENAME_MAX];
+    FILE *fp = NULL;
+
+    if (!enabled)
+    {
+    	return;
+    }
+
+    if (optional_name)
+    {
+	strcpy(file, DEFAULT_SNAPDIR);
+    	strcat(file, optional_name);
+
+	fp = fopen(file, "rb");
+
+	if (!fp)
+	{
+	    fp = fopen(optional_name, "rb");
+	}
+    }
+    else
+    {
+    	if (GUI_FileSelect(last_dir, file, ".D81"))
+	{
+	    fp = fopen(file, "rb");
+	}
+    }
+
+    if (fp)
+    {
+	if (!CheckMagic(fp))
+	{
+	    GUI_Alert(FALSE, "Not a valid snapshot");
+	}
+	else
+	{
+	    DS81_DEBUG("Loading SK snap");
+	    SK_LoadSnapshot(fp);
+	    DS81_DEBUG("Loading Z80 snap");
+	    Z80LoadSnapshot(cpu, fp);
+	    DS81_DEBUG("Loading ZX81 snap");
+	    ZX81LoadSnapshot(fp);
+	    DS81_DEBUG("Snap loaded");
+	}
+
+    	fclose(fp);
+    }
+}