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//! fastnbt aims for fast parsing of NBT data from *Minecraft: Java Edition*. //! This format is used by the game to store various things, such as the world //! data and player inventories. //! //! For documentation and examples of serde deserialization, see the //! [`de`](de/index.html) module. //! //! Both this and related crates are under one [fastnbt Github //! repository](https://github.com/owengage/fastnbt) //! //! ```toml //! [dependencies] //! fastnbt = "0.16" //! ``` //! //! # Quick example //! //! This example demonstrates printing out a players inventory and ender chest //! contents from the [player dat //! files](https://minecraft.gamepedia.com/Player.dat_format) found in worlds. //! We leverage serde's renaming attribute to have rustfmt conformant field //! names, use lifetimes to save on some string allocations, and use the `Value` //! type to deserialize a field we don't specify the exact structure of. //! //!```no_run //! use fastnbt::error::Result; //! use fastnbt::{de::from_bytes, Value}; //! use flate2::read::GzDecoder; //! use serde::Deserialize; //! use std::io::Read; //! //! #[derive(Deserialize, Debug)] //! #[serde(rename_all = "PascalCase")] //! struct PlayerDat<'a> { //! data_version: i32, //! //! #[serde(borrow)] //! inventory: Vec<InventorySlot<'a>>, //! ender_items: Vec<InventorySlot<'a>>, //! } //! //! #[derive(Deserialize, Debug)] //! struct InventorySlot<'a> { //! id: &'a str, // 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, //! } //! //! fn main() { //! 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. //! let mut decoder = GzDecoder::new(file); //! let mut data = vec![]; //! decoder.read_to_end(&mut data).unwrap(); //! //! let player: Result<PlayerDat> = from_bytes(data.as_slice()); //! //! println!("{:#?}", player); //! } //! ``` //! //! # `Read` based parser //! //! A lower level parser also exists in the `stream` module that only requires //! the `Read` trait on the input. This parser however doesn't support //! deserializing to Rust objects directly. //! use serde::Deserialize; pub mod de; pub mod error; pub mod stream; use std::{collections::HashMap, convert::TryFrom}; /// An NBT tag. This does not carry the value or the name of the data. #[derive(Debug, PartialEq, Clone, Copy)] #[repr(u8)] pub enum Tag { /// Represents the end of a Compound object. End = 0, /// Equivalent to i8. Byte = 1, /// Equivalent to i16. Short = 2, /// Equivalent to i32. Int = 3, /// Equivalent to i64 Long = 4, /// Equivalent to f32. Float = 5, /// Equivalent to f64. Double = 6, /// Represents as array of Byte (i8). ByteArray = 7, /// Represents a Unicode string. String = 8, /// Represents a list of other objects, elements are not required to be the same type. List = 9, /// Represents a struct-like structure. Compound = 10, /// Represents as array of Int (i32). IntArray = 11, /// Represents as array of Long (i64). LongArray = 12, } /// Value is a complete NBT value. It owns it's data. The Byte, Short, Int and /// Long NBT types are all deserialized into `i64`. Compounds and Lists are /// resursively deserialized. /// /// ```no_run /// # use fastnbt::Value; /// # use fastnbt::error::Result; /// # use std::collections::HashMap; /// # /// # fn main() -> Result<()> { /// # let mut buf = vec![]; /// let compound: HashMap<String, Value> = fastnbt::de::from_bytes(buf.as_slice())?; /// match compound["DataVersion"] { /// Value::Integral(ver) => println!("Version: {}", ver), /// _ => {}, /// } /// println!("{:#?}", compound); /// # Ok(()) /// # } /// ``` #[derive(Deserialize, Debug, Clone)] #[serde(untagged)] pub enum Value { /// Any integral value, ie a byte, short, int and long all deserialize to /// this type. This simplifies both usage and implementation. If you care /// about the exact integral type you may need to write a custom /// `Deserialise` type with serde. Please also open an issue with your use /// case! Integral(i64), /// A double. serde distinguishes between f32 and f64, so we do too. Double(f64), /// A float. serde distinguishes between f32 and f64, so we do too. Float(f32), /// An array of i64. This will either have been a ByteArray, IntArray or /// LongArray in the original NBT. IntegralArray(Vec<i64>), /// A unicode string. String(String), /// A List of NBT values. Each value may have a different structure/type. List(Vec<Value>), /// A compound, which is a struct-like object. Compound(HashMap<String, Value>), } // Crates exist to generate this code for us, but would add to our compile // times, so we instead right it out manually, the tags will very rarely change // so isn't a massive burden, but saves a significant amount of compile time. impl TryFrom<u8> for Tag { type Error = (); fn try_from(value: u8) -> Result<Self, ()> { use Tag::*; Ok(match value { 0 => End, 1 => Byte, 2 => Short, 3 => Int, 4 => Long, 5 => Float, 6 => Double, 7 => ByteArray, 8 => String, 9 => List, 10 => Compound, 11 => IntArray, 12 => LongArray, 13..=u8::MAX => return Err(()), }) } } #[cfg(test)] mod test;