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/*
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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