74 lines
2.5 KiB
Rust
74 lines
2.5 KiB
Rust
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use super::cpu;
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use super::ppu;
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use super::apu;
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use std::fs::File;
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use std::io::{Read, Write};
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use std::path::Path;
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use serde::{Serialize, Deserialize};
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#[derive(Serialize, Deserialize)]
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struct SaveState {
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cpu: cpu::serialize::CpuData,
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ppu: ppu::serialize::PpuData,
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apu: apu::serialize::ApuData,
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}
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pub fn save_state(cpu: &cpu::Cpu, filename: &str) -> Result<(), String> {
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let data = SaveState{
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cpu: cpu.save_state(),
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ppu: cpu.ppu.save_state(),
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apu: cpu.apu.save_state(),
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};
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let serialized = serde_json::to_string(&data)
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.map_err(|e| e.to_string())?;
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let path = match Path::new(&filename).parent() {
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Some(p) => p,
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None => return Err("couldn't convert filename to path".to_string()),
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};
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let stem = match Path::new(&filename).file_stem() {
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Some(s) => s,
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None => return Err("couldn't get file stem".to_string()),
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};
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let mut save_file = path.join(stem);
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save_file.set_extension("dat");
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println!("state saved to file: {:?}", save_file);
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let mut f = File::create(&save_file)
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.expect("could not create output file for save state");
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f.write_all(serialized.as_bytes())
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.map_err(|_| "couldn't write serialized data to file".to_string())
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}
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pub fn load_state(cpu: &mut cpu::Cpu, filename: &str) -> Result<(), String> {
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// load file, deserialize to cpudata, set cpu fields to data fields
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let path = match Path::new(&filename).parent() {
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Some(p) => p,
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None => return Err("couldn't convert filename to path".to_string()),
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};
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let stem = match Path::new(&filename).file_stem() {
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Some(s) => s,
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None => return Err("couldn't get file stem".to_string()),
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};
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let mut save_file = path.join(stem);
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save_file.set_extension("dat");
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if Path::new(&save_file).exists() {
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let mut f = File::open(save_file.clone())
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.map_err(|e| e.to_string())?;
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let mut serialized_data = vec![];
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f.read_to_end(&mut serialized_data)
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.map_err(|e| e.to_string())?;
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let serialized_string = std::str::from_utf8(&serialized_data)
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.map_err(|e| e.to_string())?;
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let state: SaveState = serde_json::from_str(serialized_string)
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.map_err(|e| e.to_string())?;
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cpu.load_state(state.cpu);
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cpu.ppu.load_state(state.ppu);
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cpu.apu.load_state(state.apu);
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println!("loading save state from file: {:?}", save_file);
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Ok(())
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} else {
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Err(format!("no save state file at {:?}", save_file))
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}
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}
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