// Copyright 2015-2019 Parity Technologies (UK) Ltd. // This file is part of Parity Ethereum. // Parity Ethereum is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // Parity Ethereum is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License // along with Parity Ethereum. If not, see . use ethereum_types::H256; use rlp::{DecoderError, Encodable, Rlp, RlpStream}; const PADDING: [u8; 10] = [0u8; 10]; pub struct DatabaseKey { pub era: u64, pub index: usize, } impl Encodable for DatabaseKey { fn rlp_append(&self, s: &mut RlpStream) { s.begin_list(3); s.append(&self.era); s.append(&self.index); s.append(&&PADDING[..]); } } pub struct DatabaseValueView<'a> { rlp: Rlp<'a>, } impl<'a> DatabaseValueView<'a> { pub fn from_rlp(data: &'a [u8]) -> Self { DatabaseValueView { rlp: Rlp::new(data), } } #[inline] pub fn id(&self) -> Result { self.rlp.val_at(0) } #[inline] pub fn inserts(&self) -> Result, DecoderError> { self.rlp.list_at(1) } #[inline] pub fn deletes(&self) -> Result, DecoderError> { self.rlp.list_at(2) } } pub struct DatabaseValueRef<'a> { pub id: &'a H256, pub inserts: &'a [H256], pub deletes: &'a [H256], } impl<'a> Encodable for DatabaseValueRef<'a> { fn rlp_append(&self, s: &mut RlpStream) { s.begin_list(3); s.append(self.id); s.append_list(self.inserts); s.append_list(self.deletes); } }