Struct RlpStream

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pub struct RlpStream { /* private fields */ }

Expand description

Appendable rlp encoder.

Implementations§

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impl RlpStream

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pub fn new() -> Self

Initializes instance of empty Stream.

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pub fn new_list(len: usize) -> Self

Initializes the Stream as a list.

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pub fn new_with_buffer(buffer: BytesMut) -> Self

Initializes instance of empty Stream.

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pub fn new_list_with_buffer(buffer: BytesMut, len: usize) -> Self

Initializes the Stream as a list.

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pub fn append_empty_data(&mut self) -> &mut Self

Apends null to the end of stream, chainable.

use rlp::RlpStream;
let mut stream = RlpStream::new_list(2);
stream.append_empty_data().append_empty_data();
let out = stream.out();
assert_eq!(out, vec![0xc2, 0x80, 0x80]);

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pub fn append_raw(&mut self, bytes: &[u8], item_count: usize) -> &mut Self

Appends raw (pre-serialised) RLP data. Use with caution. Chainable.

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pub fn append<E>(&mut self, value: &E) -> &mut Self
where E: Encodable,

Appends value to the end of stream, chainable.

use rlp::RlpStream;
let mut stream = RlpStream::new_list(2);
stream.append(&"cat").append(&"dog");
let out = stream.out();
assert_eq!(out, vec![0xc8, 0x83, b'c', b'a', b't', 0x83, b'd', b'o', b'g']);

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pub fn append_iter(&mut self, value: I) -> &mut Self
where I: IntoIterator<Item = u8>,

Appends iterator to the end of stream, chainable.

use rlp::RlpStream;
let mut stream = RlpStream::new_list(2);
stream.append(&"cat").append_iter("dog".as_bytes().iter().cloned());
let out = stream.out();
assert_eq!(out, vec![0xc8, 0x83, b'c', b'a', b't', 0x83, b'd', b'o', b'g']);

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pub fn append_list<E, K>(&mut self, values: &[K]) -> &mut Self
where E: Encodable, K: Borrow<E>,

Appends list of values to the end of stream, chainable.

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pub fn append_internal<E>(&mut self, value: &E) -> &mut Self
where E: Encodable,

Appends value to the end of stream, but do not count it as an appended item. It’s useful for wrapper types

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pub fn begin_list(&mut self, len: usize) -> &mut RlpStream

Declare appending the list of given size, chainable.

use rlp::RlpStream;
let mut stream = RlpStream::new_list(2);
stream.begin_list(2).append(&"cat").append(&"dog");
stream.append(&"");
let out = stream.out();
assert_eq!(out, vec![0xca, 0xc8, 0x83, b'c', b'a', b't', 0x83, b'd', b'o', b'g', 0x80]);

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pub fn begin_unbounded_list(&mut self) -> &mut RlpStream

Declare appending the list of unknown size, chainable.

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pub fn append_raw_checked( &mut self, bytes: &[u8], item_count: usize, max_size: usize, ) -> bool

Appends raw (pre-serialised) RLP data. Checks for size overflow.

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pub fn estimate_size(&self, add: usize) -> usize

Calculate total RLP size for appended payload.

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pub fn len(&self) -> usize

Returns current RLP size in bytes for the data pushed into the list.

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pub fn is_empty(&self) -> bool

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pub fn clear(&mut self)

Clear the output stream so far.

use rlp::RlpStream;
let mut stream = RlpStream::new_list(3);
stream.append(&"cat");
stream.clear();
stream.append(&"dog");
let out = stream.out();
assert_eq!(out, vec![0x83, b'd', b'o', b'g']);

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pub fn is_finished(&self) -> bool

Returns true if stream doesnt expect any more items.

use rlp::RlpStream;
let mut stream = RlpStream::new_list(2);
stream.append(&"cat");
assert_eq!(stream.is_finished(), false);
stream.append(&"dog");
assert_eq!(stream.is_finished(), true);
let out = stream.out();
assert_eq!(out, vec![0xc8, 0x83, b'c', b'a', b't', 0x83, b'd', b'o', b'g']);