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113 lines
3.4 KiB
Go
113 lines
3.4 KiB
Go
// Copyright 2016 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 abi
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import (
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"fmt"
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"reflect"
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)
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// indirect recursively dereferences the value until it either gets the value
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// or finds a big.Int
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func indirect(v reflect.Value) reflect.Value {
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if v.Kind() == reflect.Ptr && v.Elem().Type() != derefbig_t {
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return indirect(v.Elem())
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}
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return v
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}
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// reflectIntKind returns the reflect using the given size and
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// unsignedness.
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func reflectIntKindAndType(unsigned bool, size int) (reflect.Kind, reflect.Type) {
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switch size {
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case 8:
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if unsigned {
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return reflect.Uint8, uint8_t
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}
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return reflect.Int8, int8_t
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case 16:
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if unsigned {
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return reflect.Uint16, uint16_t
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}
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return reflect.Int16, int16_t
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case 32:
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if unsigned {
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return reflect.Uint32, uint32_t
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}
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return reflect.Int32, int32_t
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case 64:
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if unsigned {
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return reflect.Uint64, uint64_t
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}
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return reflect.Int64, int64_t
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}
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return reflect.Ptr, big_t
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}
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// mustArrayToBytesSlice creates a new byte slice with the exact same size as value
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// and copies the bytes in value to the new slice.
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func mustArrayToByteSlice(value reflect.Value) reflect.Value {
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slice := reflect.MakeSlice(reflect.TypeOf([]byte{}), value.Len(), value.Len())
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reflect.Copy(slice, value)
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return slice
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}
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// set attempts to assign src to dst by either setting, copying or otherwise.
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//
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// set is a bit more lenient when it comes to assignment and doesn't force an as
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// strict ruleset as bare `reflect` does.
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func set(dst, src reflect.Value, output Argument) error {
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dstType := dst.Type()
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srcType := src.Type()
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switch {
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case dstType.AssignableTo(srcType):
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dst.Set(src)
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case dstType.Kind() == reflect.Interface:
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dst.Set(src)
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case dstType.Kind() == reflect.Ptr:
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return set(dst.Elem(), src, output)
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default:
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return fmt.Errorf("abi: cannot unmarshal %v in to %v", src.Type(), dst.Type())
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}
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return nil
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}
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// requireAssignable assures that `dest` is a pointer and it's not an interface.
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func requireAssignable(dst, src reflect.Value) error {
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if dst.Kind() != reflect.Ptr && dst.Kind() != reflect.Interface {
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return fmt.Errorf("abi: cannot unmarshal %v into %v", src.Type(), dst.Type())
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}
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return nil
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}
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// requireUnpackKind verifies preconditions for unpacking `args` into `kind`
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func requireUnpackKind(v reflect.Value, t reflect.Type, k reflect.Kind,
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args Arguments) error {
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switch k {
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case reflect.Struct:
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case reflect.Slice, reflect.Array:
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if minLen := args.LengthNonIndexed(); v.Len() < minLen {
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return fmt.Errorf("abi: insufficient number of elements in the list/array for unpack, want %d, got %d",
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minLen, v.Len())
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}
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default:
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return fmt.Errorf("abi: cannot unmarshal tuple into %v", t)
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}
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return nil
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}
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