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72 lines
2.1 KiB
Rust
72 lines
2.1 KiB
Rust
//! Provides encoding (serialization) and decoding (deserialization) in the SimpleSerialize (SSZ)
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//! format designed for use in Ethereum 2.0.
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//!
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//! Adheres to the Ethereum 2.0 [SSZ
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//! specification](https://github.com/ethereum/eth2.0-specs/blob/v0.12.1/ssz/simple-serialize.md)
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//! at v0.12.1.
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//!
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//! ## Example
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//!
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//! ```rust
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//! use ssz_derive::{Encode, Decode};
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//! use ssz::{Decode, Encode};
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//!
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//! #[derive(PartialEq, Debug, Encode, Decode)]
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//! struct Foo {
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//! a: u64,
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//! b: Vec<u16>,
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//! }
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//!
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//! fn ssz_encode_decode_example() {
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//! let foo = Foo {
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//! a: 42,
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//! b: vec![1, 3, 3, 7]
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//! };
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//!
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//! let ssz_bytes: Vec<u8> = foo.as_ssz_bytes();
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//!
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//! let decoded_foo = Foo::from_ssz_bytes(&ssz_bytes).unwrap();
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//!
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//! assert_eq!(foo, decoded_foo);
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//! }
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//!
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//! ```
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//!
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//! See `examples/` for manual implementations of the `Encode` and `Decode` traits.
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mod decode;
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mod encode;
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pub mod legacy;
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mod union_selector;
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pub use decode::{
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impls::decode_list_of_variable_length_items, read_offset, split_union_bytes, Decode,
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DecodeError, SszDecoder, SszDecoderBuilder,
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};
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pub use encode::{encode_length, Encode, SszEncoder};
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pub use union_selector::UnionSelector;
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/// The number of bytes used to represent an offset.
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pub const BYTES_PER_LENGTH_OFFSET: usize = 4;
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/// The maximum value that can be represented using `BYTES_PER_LENGTH_OFFSET`.
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#[cfg(target_pointer_width = "32")]
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pub const MAX_LENGTH_VALUE: usize = (std::u32::MAX >> (8 * (4 - BYTES_PER_LENGTH_OFFSET))) as usize;
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#[cfg(target_pointer_width = "64")]
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pub const MAX_LENGTH_VALUE: usize = (std::u64::MAX >> (8 * (8 - BYTES_PER_LENGTH_OFFSET))) as usize;
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/// The number of bytes used to indicate the variant of a union.
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pub const BYTES_PER_UNION_SELECTOR: usize = 1;
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/// The highest possible union selector value (higher values are reserved for backwards compatible
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/// extensions).
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pub const MAX_UNION_SELECTOR: u8 = 127;
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/// Convenience function to SSZ encode an object supporting ssz::Encode.
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///
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/// Equivalent to `val.as_ssz_bytes()`.
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pub fn ssz_encode<T>(val: &T) -> Vec<u8>
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where
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T: Encode,
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{
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val.as_ssz_bytes()
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}
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