plugeth/accounts/abi/reflect.go

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// 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.
accounts/abi: reorganizing package with small fixes (#14610) * accounts/abi: reorganizing package and some notes and a quick correction of name. Signed-off-by: RJ Catalano <rj@monax.io> get rid of some imports Signed-off-by: RJ Catalano <rj@monax.io> * accounts/abi: move file names Signed-off-by: RJ Catalano <rj@monax.io> * accounts/abi: fix boolean decode function Signed-off-by: RJ Catalano <rj@monax.io> * accounts/abi: fix for the array set and for creating a bool Signed-off-by: RJ Catalano <rj@monax.io> * accounts/abi: be very very very correct Signed-off-by: RJ Catalano <rj@monax.io> * accounts/abi: fix up error message and variable names Signed-off-by: RJ Catalano <rj@monax.io> * accounts/abi: take out unnecessary argument in pack method Signed-off-by: RJ Catalano <rj@monax.io> * accounts/abi: add bool unpack test and add a panic to readBool function Signed-off-by: RJ Catalano <rj@monax.io> * accounts/abi: fix panic message Signed-off-by: RJ Catalano <rj@monax.io> * accounts/abi: change from panic to basic error Signed-off-by: RJ Catalano <rj@monax.io> * accounts/abi: fix nil to false Signed-off-by: RJ Catalano <rj@monax.io> * accounts/abi: fill out type regex tests and fill with the correct type for integers Signed-off-by: RJ Catalano <rj@monax.io> * accounts/abi: move packNumbers into pack.go. Signed-off-by: RJ Catalano <rj@monax.io> * accounts/abi: separation of the testing suite into appropriately named files. Signed-off-by: RJ Catalano <rj@monax.io> * account/abi: change to hex string tests. Signed-off-by: RJ Catalano <rj@monax.io> * account/abi: fix up rest of tests to hex Signed-off-by: RJ Catalano <rj@monax.io> * accounts/abi: declare bool at the package level Signed-off-by: RJ Catalano <rj@monax.io> * accounts/abi: use errors package in the error file. Signed-off-by: RJ Catalano <rj@monax.io> * accounts/abi: fix ugly hack and fix error type declaration. Signed-off-by: RJ Catalano <rj@monax.io>
2017-06-27 08:05:33 +00:00
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
}