mirror of https://github.com/status-im/op-geth.git
718 lines
22 KiB
Go
718 lines
22 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum 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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// go-ethereum 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 go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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package rlp
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import (
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"bytes"
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"encoding/hex"
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"fmt"
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"io"
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"math/big"
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"reflect"
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"testing"
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)
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func TestStreamKind(t *testing.T) {
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tests := []struct {
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input string
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wantKind Kind
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wantLen uint64
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}{
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{"00", Byte, 0},
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{"01", Byte, 0},
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{"7F", Byte, 0},
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{"80", String, 0},
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{"B7", String, 55},
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{"B90400", String, 1024},
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{"BFFFFFFFFFFFFFFFFF", String, ^uint64(0)},
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{"C0", List, 0},
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{"C8", List, 8},
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{"F7", List, 55},
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{"F90400", List, 1024},
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{"FFFFFFFFFFFFFFFFFF", List, ^uint64(0)},
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}
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for i, test := range tests {
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// using plainReader to inhibit input limit errors.
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s := NewStream(newPlainReader(unhex(test.input)), 0)
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kind, len, err := s.Kind()
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if err != nil {
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t.Errorf("test %d: Kind returned error: %v", i, err)
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continue
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}
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if kind != test.wantKind {
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t.Errorf("test %d: kind mismatch: got %d, want %d", i, kind, test.wantKind)
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}
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if len != test.wantLen {
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t.Errorf("test %d: len mismatch: got %d, want %d", i, len, test.wantLen)
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}
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}
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}
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func TestNewListStream(t *testing.T) {
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ls := NewListStream(bytes.NewReader(unhex("0101010101")), 3)
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if k, size, err := ls.Kind(); k != List || size != 3 || err != nil {
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t.Errorf("Kind() returned (%v, %d, %v), expected (List, 3, nil)", k, size, err)
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}
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if size, err := ls.List(); size != 3 || err != nil {
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t.Errorf("List() returned (%d, %v), expected (3, nil)", size, err)
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}
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for i := 0; i < 3; i++ {
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if val, err := ls.Uint(); val != 1 || err != nil {
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t.Errorf("Uint() returned (%d, %v), expected (1, nil)", val, err)
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}
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}
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if err := ls.ListEnd(); err != nil {
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t.Errorf("ListEnd() returned %v, expected (3, nil)", err)
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}
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}
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func TestStreamErrors(t *testing.T) {
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withoutInputLimit := func(b []byte) *Stream {
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return NewStream(newPlainReader(b), 0)
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}
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withCustomInputLimit := func(limit uint64) func([]byte) *Stream {
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return func(b []byte) *Stream {
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return NewStream(bytes.NewReader(b), limit)
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}
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}
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type calls []string
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tests := []struct {
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string
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calls
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newStream func([]byte) *Stream // uses bytes.Reader if nil
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error error
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}{
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{"C0", calls{"Bytes"}, nil, ErrExpectedString},
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{"C0", calls{"Uint"}, nil, ErrExpectedString},
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{"89000000000000000001", calls{"Uint"}, nil, errUintOverflow},
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{"00", calls{"List"}, nil, ErrExpectedList},
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{"80", calls{"List"}, nil, ErrExpectedList},
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{"C0", calls{"List", "Uint"}, nil, EOL},
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{"C8C9010101010101010101", calls{"List", "Kind"}, nil, ErrElemTooLarge},
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{"C3C2010201", calls{"List", "List", "Uint", "Uint", "ListEnd", "Uint"}, nil, EOL},
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{"00", calls{"ListEnd"}, nil, errNotInList},
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{"C401020304", calls{"List", "Uint", "ListEnd"}, nil, errNotAtEOL},
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// Non-canonical integers (e.g. leading zero bytes).
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{"00", calls{"Uint"}, nil, ErrCanonInt},
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{"820002", calls{"Uint"}, nil, ErrCanonInt},
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{"8133", calls{"Uint"}, nil, ErrCanonSize},
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{"8156", calls{"Uint"}, nil, nil},
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// Size tags must use the smallest possible encoding.
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// Leading zero bytes in the size tag are also rejected.
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{"8100", calls{"Uint"}, nil, ErrCanonSize},
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{"8100", calls{"Bytes"}, nil, ErrCanonSize},
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{"B800", calls{"Kind"}, withoutInputLimit, ErrCanonSize},
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{"B90000", calls{"Kind"}, withoutInputLimit, ErrCanonSize},
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{"B90055", calls{"Kind"}, withoutInputLimit, ErrCanonSize},
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{"BA0002FFFF", calls{"Bytes"}, withoutInputLimit, ErrCanonSize},
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{"F800", calls{"Kind"}, withoutInputLimit, ErrCanonSize},
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{"F90000", calls{"Kind"}, withoutInputLimit, ErrCanonSize},
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{"F90055", calls{"Kind"}, withoutInputLimit, ErrCanonSize},
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{"FA0002FFFF", calls{"List"}, withoutInputLimit, ErrCanonSize},
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// Expected EOF
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{"", calls{"Kind"}, nil, io.EOF},
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{"", calls{"Uint"}, nil, io.EOF},
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{"", calls{"List"}, nil, io.EOF},
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{"8158", calls{"Uint", "Uint"}, nil, io.EOF},
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{"C0", calls{"List", "ListEnd", "List"}, nil, io.EOF},
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{"", calls{"List"}, withoutInputLimit, io.EOF},
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{"8158", calls{"Uint", "Uint"}, withoutInputLimit, io.EOF},
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{"C0", calls{"List", "ListEnd", "List"}, withoutInputLimit, io.EOF},
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// Input limit errors.
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{"81", calls{"Bytes"}, nil, ErrValueTooLarge},
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{"81", calls{"Uint"}, nil, ErrValueTooLarge},
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{"81", calls{"Raw"}, nil, ErrValueTooLarge},
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{"BFFFFFFFFFFFFFFFFFFF", calls{"Bytes"}, nil, ErrValueTooLarge},
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{"C801", calls{"List"}, nil, ErrValueTooLarge},
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// Test for list element size check overflow.
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{"CD04040404FFFFFFFFFFFFFFFFFF0303", calls{"List", "Uint", "Uint", "Uint", "Uint", "List"}, nil, ErrElemTooLarge},
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// Test for input limit overflow. Since we are counting the limit
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// down toward zero in Stream.remaining, reading too far can overflow
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// remaining to a large value, effectively disabling the limit.
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{"C40102030401", calls{"Raw", "Uint"}, withCustomInputLimit(5), io.EOF},
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{"C4010203048158", calls{"Raw", "Uint"}, withCustomInputLimit(6), ErrValueTooLarge},
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// Check that the same calls are fine without a limit.
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{"C40102030401", calls{"Raw", "Uint"}, withoutInputLimit, nil},
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{"C4010203048158", calls{"Raw", "Uint"}, withoutInputLimit, nil},
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// Unexpected EOF. This only happens when there is
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// no input limit, so the reader needs to be 'dumbed down'.
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{"81", calls{"Bytes"}, withoutInputLimit, io.ErrUnexpectedEOF},
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{"81", calls{"Uint"}, withoutInputLimit, io.ErrUnexpectedEOF},
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{"BFFFFFFFFFFFFFFF", calls{"Bytes"}, withoutInputLimit, io.ErrUnexpectedEOF},
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{"C801", calls{"List", "Uint", "Uint"}, withoutInputLimit, io.ErrUnexpectedEOF},
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// This test verifies that the input position is advanced
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// correctly when calling Bytes for empty strings. Kind can be called
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// any number of times in between and doesn't advance.
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{"C3808080", calls{
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"List", // enter the list
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"Bytes", // past first element
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"Kind", "Kind", "Kind", // this shouldn't advance
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"Bytes", // past second element
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"Kind", "Kind", // can't hurt to try
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"Bytes", // past final element
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"Bytes", // this one should fail
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}, nil, EOL},
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}
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testfor:
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for i, test := range tests {
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if test.newStream == nil {
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test.newStream = func(b []byte) *Stream { return NewStream(bytes.NewReader(b), 0) }
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}
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s := test.newStream(unhex(test.string))
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rs := reflect.ValueOf(s)
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for j, call := range test.calls {
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fval := rs.MethodByName(call)
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ret := fval.Call(nil)
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err := "<nil>"
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if lastret := ret[len(ret)-1].Interface(); lastret != nil {
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err = lastret.(error).Error()
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}
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if j == len(test.calls)-1 {
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want := "<nil>"
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if test.error != nil {
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want = test.error.Error()
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}
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if err != want {
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t.Log(test)
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t.Errorf("test %d: last call (%s) error mismatch\ngot: %s\nwant: %s",
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i, call, err, test.error)
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}
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} else if err != "<nil>" {
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t.Log(test)
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t.Errorf("test %d: call %d (%s) unexpected error: %q", i, j, call, err)
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continue testfor
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}
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}
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}
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}
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func TestStreamList(t *testing.T) {
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s := NewStream(bytes.NewReader(unhex("C80102030405060708")), 0)
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len, err := s.List()
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if err != nil {
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t.Fatalf("List error: %v", err)
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}
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if len != 8 {
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t.Fatalf("List returned invalid length, got %d, want 8", len)
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}
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for i := uint64(1); i <= 8; i++ {
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v, err := s.Uint()
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if err != nil {
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t.Fatalf("Uint error: %v", err)
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}
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if i != v {
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t.Errorf("Uint returned wrong value, got %d, want %d", v, i)
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}
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}
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if _, err := s.Uint(); err != EOL {
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t.Errorf("Uint error mismatch, got %v, want %v", err, EOL)
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}
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if err = s.ListEnd(); err != nil {
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t.Fatalf("ListEnd error: %v", err)
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}
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}
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func TestStreamRaw(t *testing.T) {
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s := NewStream(bytes.NewReader(unhex("C58401010101")), 0)
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s.List()
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want := unhex("8401010101")
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raw, err := s.Raw()
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if err != nil {
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t.Fatal(err)
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}
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if !bytes.Equal(want, raw) {
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t.Errorf("raw mismatch: got %x, want %x", raw, want)
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}
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}
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func TestDecodeErrors(t *testing.T) {
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r := bytes.NewReader(nil)
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if err := Decode(r, nil); err != errDecodeIntoNil {
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t.Errorf("Decode(r, nil) error mismatch, got %q, want %q", err, errDecodeIntoNil)
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}
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var nilptr *struct{}
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if err := Decode(r, nilptr); err != errDecodeIntoNil {
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t.Errorf("Decode(r, nilptr) error mismatch, got %q, want %q", err, errDecodeIntoNil)
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}
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if err := Decode(r, struct{}{}); err != errNoPointer {
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t.Errorf("Decode(r, struct{}{}) error mismatch, got %q, want %q", err, errNoPointer)
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}
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expectErr := "rlp: type chan bool is not RLP-serializable"
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if err := Decode(r, new(chan bool)); err == nil || err.Error() != expectErr {
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t.Errorf("Decode(r, new(chan bool)) error mismatch, got %q, want %q", err, expectErr)
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}
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if err := Decode(r, new(uint)); err != io.EOF {
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t.Errorf("Decode(r, new(int)) error mismatch, got %q, want %q", err, io.EOF)
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}
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}
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type decodeTest struct {
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input string
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ptr interface{}
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value interface{}
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error string
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}
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type simplestruct struct {
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A uint
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B string
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}
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type recstruct struct {
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I uint
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Child *recstruct `rlp:"nil"`
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}
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var (
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veryBigInt = big.NewInt(0).Add(
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big.NewInt(0).Lsh(big.NewInt(0xFFFFFFFFFFFFFF), 16),
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big.NewInt(0xFFFF),
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)
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)
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var decodeTests = []decodeTest{
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// integers
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{input: "05", ptr: new(uint32), value: uint32(5)},
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{input: "80", ptr: new(uint32), value: uint32(0)},
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{input: "820505", ptr: new(uint32), value: uint32(0x0505)},
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{input: "83050505", ptr: new(uint32), value: uint32(0x050505)},
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{input: "8405050505", ptr: new(uint32), value: uint32(0x05050505)},
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{input: "850505050505", ptr: new(uint32), error: "rlp: input string too long for uint32"},
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{input: "C0", ptr: new(uint32), error: "rlp: expected input string or byte for uint32"},
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{input: "00", ptr: new(uint32), error: "rlp: non-canonical integer (leading zero bytes) for uint32"},
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{input: "8105", ptr: new(uint32), error: "rlp: non-canonical size information for uint32"},
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{input: "820004", ptr: new(uint32), error: "rlp: non-canonical integer (leading zero bytes) for uint32"},
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{input: "B8020004", ptr: new(uint32), error: "rlp: non-canonical size information for uint32"},
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// slices
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{input: "C0", ptr: new([]uint), value: []uint{}},
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{input: "C80102030405060708", ptr: new([]uint), value: []uint{1, 2, 3, 4, 5, 6, 7, 8}},
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{input: "F8020004", ptr: new([]uint), error: "rlp: non-canonical size information for []uint"},
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// arrays
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{input: "C50102030405", ptr: new([5]uint), value: [5]uint{1, 2, 3, 4, 5}},
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{input: "C0", ptr: new([5]uint), error: "rlp: input list has too few elements for [5]uint"},
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{input: "C102", ptr: new([5]uint), error: "rlp: input list has too few elements for [5]uint"},
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{input: "C6010203040506", ptr: new([5]uint), error: "rlp: input list has too many elements for [5]uint"},
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{input: "F8020004", ptr: new([5]uint), error: "rlp: non-canonical size information for [5]uint"},
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// zero sized arrays
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{input: "C0", ptr: new([0]uint), value: [0]uint{}},
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{input: "C101", ptr: new([0]uint), error: "rlp: input list has too many elements for [0]uint"},
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// byte slices
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{input: "01", ptr: new([]byte), value: []byte{1}},
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{input: "80", ptr: new([]byte), value: []byte{}},
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{input: "8D6162636465666768696A6B6C6D", ptr: new([]byte), value: []byte("abcdefghijklm")},
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{input: "C0", ptr: new([]byte), error: "rlp: expected input string or byte for []uint8"},
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{input: "8105", ptr: new([]byte), error: "rlp: non-canonical size information for []uint8"},
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// byte arrays
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{input: "02", ptr: new([1]byte), value: [1]byte{2}},
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{input: "850102030405", ptr: new([5]byte), value: [5]byte{1, 2, 3, 4, 5}},
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// byte array errors
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{input: "02", ptr: new([5]byte), error: "rlp: input string too short for [5]uint8"},
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{input: "80", ptr: new([5]byte), error: "rlp: input string too short for [5]uint8"},
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{input: "820000", ptr: new([5]byte), error: "rlp: input string too short for [5]uint8"},
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{input: "C0", ptr: new([5]byte), error: "rlp: expected input string or byte for [5]uint8"},
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{input: "C3010203", ptr: new([5]byte), error: "rlp: expected input string or byte for [5]uint8"},
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{input: "86010203040506", ptr: new([5]byte), error: "rlp: input string too long for [5]uint8"},
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{input: "8105", ptr: new([1]byte), error: "rlp: non-canonical size information for [1]uint8"},
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// zero sized byte arrays
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{input: "80", ptr: new([0]byte), value: [0]byte{}},
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{input: "01", ptr: new([0]byte), error: "rlp: input string too long for [0]uint8"},
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{input: "8101", ptr: new([0]byte), error: "rlp: input string too long for [0]uint8"},
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// strings
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{input: "00", ptr: new(string), value: "\000"},
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{input: "8D6162636465666768696A6B6C6D", ptr: new(string), value: "abcdefghijklm"},
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{input: "C0", ptr: new(string), error: "rlp: expected input string or byte for string"},
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// big ints
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{input: "01", ptr: new(*big.Int), value: big.NewInt(1)},
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{input: "89FFFFFFFFFFFFFFFFFF", ptr: new(*big.Int), value: veryBigInt},
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{input: "10", ptr: new(big.Int), value: *big.NewInt(16)}, // non-pointer also works
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{input: "C0", ptr: new(*big.Int), error: "rlp: expected input string or byte for *big.Int"},
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{input: "820001", ptr: new(big.Int), error: "rlp: non-canonical integer (leading zero bytes) for *big.Int"},
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{input: "8105", ptr: new(big.Int), error: "rlp: non-canonical size information for *big.Int"},
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// structs
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{
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input: "C50583343434",
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ptr: new(simplestruct),
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value: simplestruct{5, "444"},
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},
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{
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input: "C601C402C203C0",
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ptr: new(recstruct),
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value: recstruct{1, &recstruct{2, &recstruct{3, nil}}},
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},
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// struct errors
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{
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input: "C0",
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ptr: new(simplestruct),
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error: "rlp: too few elements for rlp.simplestruct",
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},
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{
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input: "C105",
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ptr: new(simplestruct),
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error: "rlp: too few elements for rlp.simplestruct",
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},
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{
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input: "C7C50583343434C0",
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ptr: new([]*simplestruct),
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error: "rlp: too few elements for rlp.simplestruct, decoding into ([]*rlp.simplestruct)[1]",
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},
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{
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input: "83222222",
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ptr: new(simplestruct),
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error: "rlp: expected input list for rlp.simplestruct",
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},
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{
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input: "C3010101",
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ptr: new(simplestruct),
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error: "rlp: input list has too many elements for rlp.simplestruct",
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},
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{
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input: "C501C3C00000",
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ptr: new(recstruct),
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error: "rlp: expected input string or byte for uint, decoding into (rlp.recstruct).Child.I",
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},
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// pointers
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{input: "00", ptr: new(*[]byte), value: &[]byte{0}},
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{input: "80", ptr: new(*uint), value: uintp(0)},
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{input: "C0", ptr: new(*uint), error: "rlp: expected input string or byte for uint"},
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{input: "07", ptr: new(*uint), value: uintp(7)},
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{input: "8158", ptr: new(*uint), value: uintp(0x58)},
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{input: "C109", ptr: new(*[]uint), value: &[]uint{9}},
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{input: "C58403030303", ptr: new(*[][]byte), value: &[][]byte{{3, 3, 3, 3}}},
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// check that input position is advanced also for empty values.
|
|
{input: "C3808005", ptr: new([]*uint), value: []*uint{uintp(0), uintp(0), uintp(5)}},
|
|
|
|
// interface{}
|
|
{input: "00", ptr: new(interface{}), value: []byte{0}},
|
|
{input: "01", ptr: new(interface{}), value: []byte{1}},
|
|
{input: "80", ptr: new(interface{}), value: []byte{}},
|
|
{input: "850505050505", ptr: new(interface{}), value: []byte{5, 5, 5, 5, 5}},
|
|
{input: "C0", ptr: new(interface{}), value: []interface{}{}},
|
|
{input: "C50183040404", ptr: new(interface{}), value: []interface{}{[]byte{1}, []byte{4, 4, 4}}},
|
|
{
|
|
input: "C3010203",
|
|
ptr: new([]io.Reader),
|
|
error: "rlp: type io.Reader is not RLP-serializable",
|
|
},
|
|
|
|
// fuzzer crashes
|
|
{
|
|
input: "c330f9c030f93030ce3030303030303030bd303030303030",
|
|
ptr: new(interface{}),
|
|
error: "rlp: element is larger than containing list",
|
|
},
|
|
}
|
|
|
|
func uintp(i uint) *uint { return &i }
|
|
|
|
func runTests(t *testing.T, decode func([]byte, interface{}) error) {
|
|
for i, test := range decodeTests {
|
|
input, err := hex.DecodeString(test.input)
|
|
if err != nil {
|
|
t.Errorf("test %d: invalid hex input %q", i, test.input)
|
|
continue
|
|
}
|
|
err = decode(input, test.ptr)
|
|
if err != nil && test.error == "" {
|
|
t.Errorf("test %d: unexpected Decode error: %v\ndecoding into %T\ninput %q",
|
|
i, err, test.ptr, test.input)
|
|
continue
|
|
}
|
|
if test.error != "" && fmt.Sprint(err) != test.error {
|
|
t.Errorf("test %d: Decode error mismatch\ngot %v\nwant %v\ndecoding into %T\ninput %q",
|
|
i, err, test.error, test.ptr, test.input)
|
|
continue
|
|
}
|
|
deref := reflect.ValueOf(test.ptr).Elem().Interface()
|
|
if err == nil && !reflect.DeepEqual(deref, test.value) {
|
|
t.Errorf("test %d: value mismatch\ngot %#v\nwant %#v\ndecoding into %T\ninput %q",
|
|
i, deref, test.value, test.ptr, test.input)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestDecodeWithByteReader(t *testing.T) {
|
|
runTests(t, func(input []byte, into interface{}) error {
|
|
return Decode(bytes.NewReader(input), into)
|
|
})
|
|
}
|
|
|
|
// plainReader reads from a byte slice but does not
|
|
// implement ReadByte. It is also not recognized by the
|
|
// size validation. This is useful to test how the decoder
|
|
// behaves on a non-buffered input stream.
|
|
type plainReader []byte
|
|
|
|
func newPlainReader(b []byte) io.Reader {
|
|
return (*plainReader)(&b)
|
|
}
|
|
|
|
func (r *plainReader) Read(buf []byte) (n int, err error) {
|
|
if len(*r) == 0 {
|
|
return 0, io.EOF
|
|
}
|
|
n = copy(buf, *r)
|
|
*r = (*r)[n:]
|
|
return n, nil
|
|
}
|
|
|
|
func TestDecodeWithNonByteReader(t *testing.T) {
|
|
runTests(t, func(input []byte, into interface{}) error {
|
|
return Decode(newPlainReader(input), into)
|
|
})
|
|
}
|
|
|
|
func TestDecodeStreamReset(t *testing.T) {
|
|
s := NewStream(nil, 0)
|
|
runTests(t, func(input []byte, into interface{}) error {
|
|
s.Reset(bytes.NewReader(input), 0)
|
|
return s.Decode(into)
|
|
})
|
|
}
|
|
|
|
type testDecoder struct{ called bool }
|
|
|
|
func (t *testDecoder) DecodeRLP(s *Stream) error {
|
|
if _, err := s.Uint(); err != nil {
|
|
return err
|
|
}
|
|
t.called = true
|
|
return nil
|
|
}
|
|
|
|
func TestDecodeDecoder(t *testing.T) {
|
|
var s struct {
|
|
T1 testDecoder
|
|
T2 *testDecoder
|
|
T3 **testDecoder
|
|
}
|
|
if err := Decode(bytes.NewReader(unhex("C3010203")), &s); err != nil {
|
|
t.Fatalf("Decode error: %v", err)
|
|
}
|
|
|
|
if !s.T1.called {
|
|
t.Errorf("DecodeRLP was not called for (non-pointer) testDecoder")
|
|
}
|
|
|
|
if s.T2 == nil {
|
|
t.Errorf("*testDecoder has not been allocated")
|
|
} else if !s.T2.called {
|
|
t.Errorf("DecodeRLP was not called for *testDecoder")
|
|
}
|
|
|
|
if s.T3 == nil || *s.T3 == nil {
|
|
t.Errorf("**testDecoder has not been allocated")
|
|
} else if !(*s.T3).called {
|
|
t.Errorf("DecodeRLP was not called for **testDecoder")
|
|
}
|
|
}
|
|
|
|
type byteDecoder byte
|
|
|
|
func (bd *byteDecoder) DecodeRLP(s *Stream) error {
|
|
_, err := s.Uint()
|
|
*bd = 255
|
|
return err
|
|
}
|
|
|
|
func (bd byteDecoder) called() bool {
|
|
return bd == 255
|
|
}
|
|
|
|
// This test verifies that the byte slice/byte array logic
|
|
// does not kick in for element types implementing Decoder.
|
|
func TestDecoderInByteSlice(t *testing.T) {
|
|
var slice []byteDecoder
|
|
if err := Decode(bytes.NewReader(unhex("C101")), &slice); err != nil {
|
|
t.Errorf("unexpected Decode error %v", err)
|
|
} else if !slice[0].called() {
|
|
t.Errorf("DecodeRLP not called for slice element")
|
|
}
|
|
|
|
var array [1]byteDecoder
|
|
if err := Decode(bytes.NewReader(unhex("C101")), &array); err != nil {
|
|
t.Errorf("unexpected Decode error %v", err)
|
|
} else if !array[0].called() {
|
|
t.Errorf("DecodeRLP not called for array element")
|
|
}
|
|
}
|
|
|
|
func ExampleDecode() {
|
|
input, _ := hex.DecodeString("C90A1486666F6F626172")
|
|
|
|
type example struct {
|
|
A, B uint
|
|
private uint // private fields are ignored
|
|
String string
|
|
}
|
|
|
|
var s example
|
|
err := Decode(bytes.NewReader(input), &s)
|
|
if err != nil {
|
|
fmt.Printf("Error: %v\n", err)
|
|
} else {
|
|
fmt.Printf("Decoded value: %#v\n", s)
|
|
}
|
|
// Output:
|
|
// Decoded value: rlp.example{A:0xa, B:0x14, private:0x0, String:"foobar"}
|
|
}
|
|
|
|
func ExampleDecode_structTagNil() {
|
|
// In this example, we'll use the "nil" struct tag to change
|
|
// how a pointer-typed field is decoded. The input contains an RLP
|
|
// list of one element, an empty string.
|
|
input := []byte{0xC1, 0x80}
|
|
|
|
// This type uses the normal rules.
|
|
// The empty input string is decoded as a pointer to an empty Go string.
|
|
var normalRules struct {
|
|
String *string
|
|
}
|
|
Decode(bytes.NewReader(input), &normalRules)
|
|
fmt.Printf("normal: String = %q\n", *normalRules.String)
|
|
|
|
// This type uses the struct tag.
|
|
// The empty input string is decoded as a nil pointer.
|
|
var withEmptyOK struct {
|
|
String *string `rlp:"nil"`
|
|
}
|
|
Decode(bytes.NewReader(input), &withEmptyOK)
|
|
fmt.Printf("with nil tag: String = %v\n", withEmptyOK.String)
|
|
|
|
// Output:
|
|
// normal: String = ""
|
|
// with nil tag: String = <nil>
|
|
}
|
|
|
|
func ExampleStream() {
|
|
input, _ := hex.DecodeString("C90A1486666F6F626172")
|
|
s := NewStream(bytes.NewReader(input), 0)
|
|
|
|
// Check what kind of value lies ahead
|
|
kind, size, _ := s.Kind()
|
|
fmt.Printf("Kind: %v size:%d\n", kind, size)
|
|
|
|
// Enter the list
|
|
if _, err := s.List(); err != nil {
|
|
fmt.Printf("List error: %v\n", err)
|
|
return
|
|
}
|
|
|
|
// Decode elements
|
|
fmt.Println(s.Uint())
|
|
fmt.Println(s.Uint())
|
|
fmt.Println(s.Bytes())
|
|
|
|
// Acknowledge end of list
|
|
if err := s.ListEnd(); err != nil {
|
|
fmt.Printf("ListEnd error: %v\n", err)
|
|
}
|
|
// Output:
|
|
// Kind: List size:9
|
|
// 10 <nil>
|
|
// 20 <nil>
|
|
// [102 111 111 98 97 114] <nil>
|
|
}
|
|
|
|
func BenchmarkDecode(b *testing.B) {
|
|
enc := encodeTestSlice(90000)
|
|
b.SetBytes(int64(len(enc)))
|
|
b.ReportAllocs()
|
|
b.ResetTimer()
|
|
|
|
for i := 0; i < b.N; i++ {
|
|
var s []uint
|
|
r := bytes.NewReader(enc)
|
|
if err := Decode(r, &s); err != nil {
|
|
b.Fatalf("Decode error: %v", err)
|
|
}
|
|
}
|
|
}
|
|
|
|
func BenchmarkDecodeIntSliceReuse(b *testing.B) {
|
|
enc := encodeTestSlice(100000)
|
|
b.SetBytes(int64(len(enc)))
|
|
b.ReportAllocs()
|
|
b.ResetTimer()
|
|
|
|
var s []uint
|
|
for i := 0; i < b.N; i++ {
|
|
r := bytes.NewReader(enc)
|
|
if err := Decode(r, &s); err != nil {
|
|
b.Fatalf("Decode error: %v", err)
|
|
}
|
|
}
|
|
}
|
|
|
|
func encodeTestSlice(n uint) []byte {
|
|
s := make([]uint, n)
|
|
for i := uint(0); i < n; i++ {
|
|
s[i] = i
|
|
}
|
|
b, err := EncodeToBytes(s)
|
|
if err != nil {
|
|
panic(fmt.Sprintf("encode error: %v", err))
|
|
}
|
|
return b
|
|
}
|
|
|
|
func unhex(str string) []byte {
|
|
b, err := hex.DecodeString(str)
|
|
if err != nil {
|
|
panic(fmt.Sprintf("invalid hex string: %q", str))
|
|
}
|
|
return b
|
|
}
|