129 lines
3.8 KiB
Go
129 lines
3.8 KiB
Go
// Copyright 2016 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"
|
|
)
|
|
|
|
// indirect recursively dereferences the value until it either gets the value
|
|
// or finds a big.Int
|
|
func indirect(v reflect.Value) reflect.Value {
|
|
if v.Kind() == reflect.Ptr && v.Elem().Type() != derefbigT {
|
|
return indirect(v.Elem())
|
|
}
|
|
return v
|
|
}
|
|
|
|
// reflectIntKind returns the reflect using the given size and
|
|
// unsignedness.
|
|
func reflectIntKindAndType(unsigned bool, size int) (reflect.Kind, reflect.Type) {
|
|
switch size {
|
|
case 8:
|
|
if unsigned {
|
|
return reflect.Uint8, uint8T
|
|
}
|
|
return reflect.Int8, int8T
|
|
case 16:
|
|
if unsigned {
|
|
return reflect.Uint16, uint16T
|
|
}
|
|
return reflect.Int16, int16T
|
|
case 32:
|
|
if unsigned {
|
|
return reflect.Uint32, uint32T
|
|
}
|
|
return reflect.Int32, int32T
|
|
case 64:
|
|
if unsigned {
|
|
return reflect.Uint64, uint64T
|
|
}
|
|
return reflect.Int64, int64T
|
|
}
|
|
return reflect.Ptr, bigT
|
|
}
|
|
|
|
// mustArrayToBytesSlice creates a new byte slice with the exact same size as value
|
|
// and copies the bytes in value to the new slice.
|
|
func mustArrayToByteSlice(value reflect.Value) reflect.Value {
|
|
slice := reflect.MakeSlice(reflect.TypeOf([]byte{}), value.Len(), value.Len())
|
|
reflect.Copy(slice, value)
|
|
return slice
|
|
}
|
|
|
|
// set attempts to assign src to dst by either setting, copying or otherwise.
|
|
//
|
|
// set is a bit more lenient when it comes to assignment and doesn't force an as
|
|
// strict ruleset as bare `reflect` does.
|
|
func set(dst, src reflect.Value, output Argument) error {
|
|
dstType := dst.Type()
|
|
srcType := src.Type()
|
|
switch {
|
|
case dstType.AssignableTo(srcType):
|
|
dst.Set(src)
|
|
case dstType.Kind() == reflect.Interface:
|
|
dst.Set(src)
|
|
case dstType.Kind() == reflect.Ptr:
|
|
return set(dst.Elem(), src, output)
|
|
default:
|
|
return fmt.Errorf("abi: cannot unmarshal %v in to %v", src.Type(), dst.Type())
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// requireAssignable assures that `dest` is a pointer and it's not an interface.
|
|
func requireAssignable(dst, src reflect.Value) error {
|
|
if dst.Kind() != reflect.Ptr && dst.Kind() != reflect.Interface {
|
|
return fmt.Errorf("abi: cannot unmarshal %v into %v", src.Type(), dst.Type())
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// requireUnpackKind verifies preconditions for unpacking `args` into `kind`
|
|
func requireUnpackKind(v reflect.Value, t reflect.Type, k reflect.Kind,
|
|
args Arguments) error {
|
|
|
|
switch k {
|
|
case reflect.Struct:
|
|
case reflect.Slice, reflect.Array:
|
|
if minLen := args.LengthNonIndexed(); v.Len() < minLen {
|
|
return fmt.Errorf("abi: insufficient number of elements in the list/array for unpack, want %d, got %d",
|
|
minLen, v.Len())
|
|
}
|
|
default:
|
|
return fmt.Errorf("abi: cannot unmarshal tuple into %v", t)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// requireUniqueStructFieldNames makes sure field names don't collide
|
|
func requireUniqueStructFieldNames(args Arguments) error {
|
|
exists := make(map[string]bool)
|
|
for _, arg := range args {
|
|
field := capitalise(arg.Name)
|
|
if field == "" {
|
|
return fmt.Errorf("abi: purely underscored output cannot unpack to struct")
|
|
}
|
|
if exists[field] {
|
|
return fmt.Errorf("abi: multiple outputs mapping to the same struct field '%s'", field)
|
|
}
|
|
exists[field] = true
|
|
}
|
|
return nil
|
|
}
|