77 lines
1.8 KiB
Rust
77 lines
1.8 KiB
Rust
// Copyright 2015-2018 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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use ethereum_types::H256;
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use rlp::{RlpStream, Encodable, Rlp, DecoderError};
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const PADDING : [u8; 10] = [ 0u8; 10 ];
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pub struct DatabaseKey {
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pub era: u64,
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pub index: usize,
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}
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impl Encodable for DatabaseKey {
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fn rlp_append(&self, s: &mut RlpStream) {
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s.begin_list(3);
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s.append(&self.era);
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s.append(&self.index);
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s.append(&&PADDING[..]);
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}
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}
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pub struct DatabaseValueView<'a> {
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rlp: Rlp<'a>,
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}
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impl<'a> DatabaseValueView<'a> {
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pub fn from_rlp(data: &'a [u8]) -> Self {
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DatabaseValueView {
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rlp: Rlp::new(data),
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}
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}
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#[inline]
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pub fn id(&self) -> Result<H256, DecoderError> {
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self.rlp.val_at(0)
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}
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#[inline]
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pub fn inserts(&self) -> Result<Vec<H256>, DecoderError> {
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self.rlp.list_at(1)
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}
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#[inline]
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pub fn deletes(&self) -> Result<Vec<H256>, DecoderError> {
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self.rlp.list_at(2)
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}
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}
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pub struct DatabaseValueRef<'a> {
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pub id: &'a H256,
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pub inserts: &'a [H256],
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pub deletes: &'a [H256],
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}
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impl<'a> Encodable for DatabaseValueRef<'a> {
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fn rlp_append(&self, s: &mut RlpStream) {
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s.begin_list(3);
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s.append(self.id);
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s.append_list(self.inserts);
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s.append_list(self.deletes);
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}
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}
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