From abad1c81839420fa60d8923d2332ea003cd73a06 Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Fri, 25 Jun 2021 19:38:44 +0000
Subject: Added files and got initial support working.  ZX81 display needed.

---
 source/snapshot.c | 192 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 192 insertions(+)
 create mode 100644 source/snapshot.c

(limited to 'source/snapshot.c')

diff --git a/source/snapshot.c b/source/snapshot.c
new file mode 100644
index 0000000..b64d309
--- /dev/null
+++ b/source/snapshot.c
@@ -0,0 +1,192 @@
+/*
+    3ds81 - Nintendo 3DS ZX81 emulator
+
+    Copyright (C) 2021  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 3 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, see <http://www.gnu.org/licenses/>
+
+    -------------------------------------------------------------------------
+
+    Provides the routines for snapshotting.
+
+*/
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <3ds.h>
+
+#include "snapshot.h"
+#include "zx81.h"
+#include "gui.h"
+
+#include "config.h"
+
+#ifndef TRUE
+#define TRUE 1
+#endif
+
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+
+/* ---------------------------------------- STATICS
+*/
+static int		enabled;
+static const char 	*magic = "V01_DS81";
+static const char	*extension[2] = {".D81", ".K81"};
+
+
+/* ---------------------------------------- PRIVATE FUNCTIONS
+*/
+static void WriteMagic(FILE *fp, SnapshotType t)
+{
+    const char *p = magic;
+
+    while(*p)
+    {
+    	fputc(*p++, fp);
+    }
+
+    fputc(t, fp);
+}
+
+static int CheckMagic(FILE *fp, SnapshotType t)
+{
+    const char *p = magic;
+
+    while(*p)
+    {
+	if (fgetc(fp) != *p++)
+	{
+	    return FALSE;
+	}
+    }
+
+    return (fgetc(fp) == t);
+}
+
+
+/* ---------------------------------------- EXPORTED INTERFACES
+*/
+void SNAP_Enable(int enable)
+{
+    enabled = enable;
+}
+
+void SNAP_Save(Z80 *cpu, SnapshotType type)
+{
+    char base[FILENAME_MAX] = "";
+    char file[FILENAME_MAX];
+    FILE *fp = NULL;
+
+    if (!enabled)
+    {
+    	return;
+    }
+
+    if(!GUI_InputName("Enter snapshot filename",
+    			extension[type], base, 8) || !base[0])
+    {
+    	return;
+    }
+
+    strcat(base, extension[type]);
+
+    strcpy(file, DEFAULT_SNAPDIR);
+    strcat(file, base);
+
+    fp = fopen(file, "wb");
+
+    if (!fp)
+    {
+	fp = fopen(base, "wb");
+    }
+
+    if (fp)
+    {
+	WriteMagic(fp, type);
+
+	SK_SaveSnapshot(fp);
+
+	if (type == SNAP_TYPE_FULL)
+	{
+	    Z80SaveSnapshot(cpu, fp);
+	    ZX81SaveSnapshot(fp);
+	}
+
+    	fclose(fp);
+    }
+    else
+    {
+	GUI_Alert(FALSE, "Failed to save snapshot");
+    }
+}
+
+void SNAP_Load(Z80 *cpu, const char *optional_name, SnapshotType type)
+{
+    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);
+    	strcat(file, extension[type]);
+
+	fp = fopen(file, "rb");
+
+	if (!fp)
+	{
+	    strcpy(file, optional_name);
+	    strcat(file, extension[type]);
+
+	    fp = fopen(file, "rb");
+	}
+    }
+    else
+    {
+    	if (GUI_FileSelect(last_dir, file, extension[type]))
+	{
+	    fp = fopen(file, "rb");
+	}
+    }
+
+    if (fp)
+    {
+	if (!CheckMagic(fp, type))
+	{
+	    GUI_Alert(FALSE, "Not a valid snapshot");
+	}
+	else
+	{
+	    SK_LoadSnapshot(fp);
+
+	    if (type == SNAP_TYPE_FULL)
+	    {
+		Z80LoadSnapshot(cpu, fp);
+		ZX81LoadSnapshot(fp);
+	    }
+	}
+
+    	fclose(fp);
+    }
+}
-- 
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