Demos

Examples

Example: editing level.dat

#[derive(Serialize,Deserialize)]structLevelDat{#[serde(rename ="Data")]data:Data,}#[derive(Serialize,Deserialize)]#[serde(rename_all ="PascalCase")]structData{spawn_x:i32,spawn_y:i32,spawn_z:i32,#[serde(flatten)]other:HashMap<String,Value>,}fnmain(){let args:Vec<_> = std::env::args_os().collect();let file = std::fs::File::open(&args[1]).unwrap();letmut decoder =GzDecoder::new(file);letmut bytes =vec![];    decoder.read_to_end(&mut bytes).unwrap();letmut leveldat:LevelDat = fastnbt::from_bytes(&bytes).unwrap();    leveldat.data.spawn_x =250;    leveldat.data.spawn_y =200;    leveldat.data.spawn_z =250;let new_bytes = fastnbt::to_bytes(&leveldat).unwrap();let outfile = std::fs::File::create("level.dat").unwrap();letmut encoder =GzEncoder::new(outfile,Compression::fast());    encoder.write_all(&new_bytes).unwrap();}

Example: print player inventory

#[derive(Deserialize,Debug)]#[serde(rename_all ="PascalCase")]structPlayerDat<'a>{data_version:i32,#[serde(borrow)]inventory:Vec<InventorySlot<'a>>,ender_items:Vec<InventorySlot<'a>>,}#[derive(Deserialize,Debug)]structInventorySlot<'a>{id:&'astr,// We avoid allocating a string here.tag:Option<Value>,// Also get the less structured properties of the object.// We need to rename fields a lot.#[serde(rename ="Count")]count:i8,}fnmain(){let args:Vec<_> = std::env::args().skip(1).collect();let file = std::fs::File::open(args[0].clone()).unwrap();// Player dat files are compressed with GZip.letmut decoder =GzDecoder::new(file);letmut data =vec![];    decoder.read_to_end(&mut data).unwrap();let player:Result<PlayerDat> =from_bytes(data.as_slice());println!("{:#?}", player);}

Usage

[dependencies]fastnbt ="2"fastanvil ="0.31"

cargo install fastnbt-tools