mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
synced 2024-12-22 11:41:19 +00:00
89c6c5bb85
When converting a negative number e.g., -2, the resulting ABI encoding should look as follows: fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe. However, since the check of the type is for an uint instead of an int, it results in the following ABI encoding: 0101010101010101010101010101010101010101010101010101010101010102. The Ethereum ABI (https://github.com/ethereum/wiki/wiki/Ethereum-Contract-ABI) says, that signed integers are stored in two's complement which should be of the form ffffff.... and not 01010101..... for e.g. -1. Thus, I removed the type check in numbers.go as well as the function S256 as I don't think they are correct. Or maybe I'm missing something?
119 lines
3.8 KiB
Go
119 lines
3.8 KiB
Go
// Copyright 2015 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library 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 Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package abi
|
|
|
|
import (
|
|
"fmt"
|
|
"reflect"
|
|
"strings"
|
|
|
|
"github.com/ethereum/go-ethereum/crypto"
|
|
)
|
|
|
|
// Callable method given a `Name` and whether the method is a constant.
|
|
// If the method is `Const` no transaction needs to be created for this
|
|
// particular Method call. It can easily be simulated using a local VM.
|
|
// For example a `Balance()` method only needs to retrieve something
|
|
// from the storage and therefor requires no Tx to be send to the
|
|
// network. A method such as `Transact` does require a Tx and thus will
|
|
// be flagged `true`.
|
|
// Input specifies the required input parameters for this gives method.
|
|
type Method struct {
|
|
Name string
|
|
Const bool
|
|
Inputs []Argument
|
|
Outputs []Argument
|
|
}
|
|
|
|
func (m Method) pack(method Method, args ...interface{}) ([]byte, error) {
|
|
// Make sure arguments match up and pack them
|
|
if len(args) != len(method.Inputs) {
|
|
return nil, fmt.Errorf("argument count mismatch: %d for %d", len(args), len(method.Inputs))
|
|
}
|
|
// variable input is the output appended at the end of packed
|
|
// output. This is used for strings and bytes types input.
|
|
var variableInput []byte
|
|
|
|
var ret []byte
|
|
for i, a := range args {
|
|
input := method.Inputs[i]
|
|
// pack the input
|
|
packed, err := input.Type.pack(reflect.ValueOf(a))
|
|
if err != nil {
|
|
return nil, fmt.Errorf("`%s` %v", method.Name, err)
|
|
}
|
|
|
|
// check for a slice type (string, bytes, slice)
|
|
if input.Type.requiresLengthPrefix() {
|
|
// calculate the offset
|
|
offset := len(method.Inputs)*32 + len(variableInput)
|
|
// set the offset
|
|
ret = append(ret, packNum(reflect.ValueOf(offset))...)
|
|
// Append the packed output to the variable input. The variable input
|
|
// will be appended at the end of the input.
|
|
variableInput = append(variableInput, packed...)
|
|
} else {
|
|
// append the packed value to the input
|
|
ret = append(ret, packed...)
|
|
}
|
|
}
|
|
// append the variable input at the end of the packed input
|
|
ret = append(ret, variableInput...)
|
|
|
|
return ret, nil
|
|
}
|
|
|
|
// Sig returns the methods string signature according to the ABI spec.
|
|
//
|
|
// Example
|
|
//
|
|
// function foo(uint32 a, int b) = "foo(uint32,int256)"
|
|
//
|
|
// Please note that "int" is substitute for its canonical representation "int256"
|
|
func (m Method) Sig() string {
|
|
types := make([]string, len(m.Inputs))
|
|
i := 0
|
|
for _, input := range m.Inputs {
|
|
types[i] = input.Type.String()
|
|
i++
|
|
}
|
|
return fmt.Sprintf("%v(%v)", m.Name, strings.Join(types, ","))
|
|
}
|
|
|
|
func (m Method) String() string {
|
|
inputs := make([]string, len(m.Inputs))
|
|
for i, input := range m.Inputs {
|
|
inputs[i] = fmt.Sprintf("%v %v", input.Name, input.Type)
|
|
}
|
|
outputs := make([]string, len(m.Outputs))
|
|
for i, output := range m.Outputs {
|
|
if len(output.Name) > 0 {
|
|
outputs[i] = fmt.Sprintf("%v ", output.Name)
|
|
}
|
|
outputs[i] += output.Type.String()
|
|
}
|
|
constant := ""
|
|
if m.Const {
|
|
constant = "constant "
|
|
}
|
|
return fmt.Sprintf("function %v(%v) %sreturns(%v)", m.Name, strings.Join(inputs, ", "), constant, strings.Join(outputs, ", "))
|
|
}
|
|
|
|
func (m Method) Id() []byte {
|
|
return crypto.Keccak256([]byte(m.Sig()))[:4]
|
|
}
|