61 lines
1.6 KiB
Go
61 lines
1.6 KiB
Go
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// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser 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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//
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// The go-ethereum library 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 Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package rlp
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type listIterator struct {
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data []byte
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next []byte
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err error
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}
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// NewListIterator creates an iterator for the (list) represented by data
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func NewListIterator(data RawValue) (*listIterator, error) {
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k, t, c, err := readKind(data)
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if err != nil {
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return nil, err
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}
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if k != List {
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return nil, ErrExpectedList
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}
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it := &listIterator{
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data: data[t : t+c],
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}
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return it, nil
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}
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// Next forwards the iterator one step, returns true if it was not at end yet
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func (it *listIterator) Next() bool {
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if len(it.data) == 0 {
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return false
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}
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_, t, c, err := readKind(it.data)
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it.next = it.data[:t+c]
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it.data = it.data[t+c:]
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it.err = err
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return true
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}
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// Value returns the current value
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func (it *listIterator) Value() []byte {
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return it.next
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}
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func (it *listIterator) Err() error {
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return it.err
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}
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