github.com/MetalBlockchain/subnet-evm@v0.4.9/accounts/abi/error_handling.go (about)

     1  // (c) 2019-2021, Ava Labs, Inc.
     2  //
     3  // This file is a derived work, based on the go-ethereum library whose original
     4  // notices appear below.
     5  //
     6  // It is distributed under a license compatible with the licensing terms of the
     7  // original code from which it is derived.
     8  //
     9  // Much love to the original authors for their work.
    10  // **********
    11  // Copyright 2016 The go-ethereum Authors
    12  // This file is part of the go-ethereum library.
    13  //
    14  // The go-ethereum library is free software: you can redistribute it and/or modify
    15  // it under the terms of the GNU Lesser General Public License as published by
    16  // the Free Software Foundation, either version 3 of the License, or
    17  // (at your option) any later version.
    18  //
    19  // The go-ethereum library is distributed in the hope that it will be useful,
    20  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    21  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    22  // GNU Lesser General Public License for more details.
    23  //
    24  // You should have received a copy of the GNU Lesser General Public License
    25  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    26  
    27  package abi
    28  
    29  import (
    30  	"errors"
    31  	"fmt"
    32  	"reflect"
    33  )
    34  
    35  var (
    36  	errBadBool = errors.New("abi: improperly encoded boolean value")
    37  )
    38  
    39  // formatSliceString formats the reflection kind with the given slice size
    40  // and returns a formatted string representation.
    41  func formatSliceString(kind reflect.Kind, sliceSize int) string {
    42  	if sliceSize == -1 {
    43  		return fmt.Sprintf("[]%v", kind)
    44  	}
    45  	return fmt.Sprintf("[%d]%v", sliceSize, kind)
    46  }
    47  
    48  // sliceTypeCheck checks that the given slice can by assigned to the reflection
    49  // type in t.
    50  func sliceTypeCheck(t Type, val reflect.Value) error {
    51  	if val.Kind() != reflect.Slice && val.Kind() != reflect.Array {
    52  		return typeErr(formatSliceString(t.GetType().Kind(), t.Size), val.Type())
    53  	}
    54  
    55  	if t.T == ArrayTy && val.Len() != t.Size {
    56  		return typeErr(formatSliceString(t.Elem.GetType().Kind(), t.Size), formatSliceString(val.Type().Elem().Kind(), val.Len()))
    57  	}
    58  
    59  	if t.Elem.T == SliceTy || t.Elem.T == ArrayTy {
    60  		if val.Len() > 0 {
    61  			return sliceTypeCheck(*t.Elem, val.Index(0))
    62  		}
    63  	}
    64  
    65  	if val.Type().Elem().Kind() != t.Elem.GetType().Kind() {
    66  		return typeErr(formatSliceString(t.Elem.GetType().Kind(), t.Size), val.Type())
    67  	}
    68  	return nil
    69  }
    70  
    71  // typeCheck checks that the given reflection value can be assigned to the reflection
    72  // type in t.
    73  func typeCheck(t Type, value reflect.Value) error {
    74  	if t.T == SliceTy || t.T == ArrayTy {
    75  		return sliceTypeCheck(t, value)
    76  	}
    77  
    78  	// Check base type validity. Element types will be checked later on.
    79  	if t.GetType().Kind() != value.Kind() {
    80  		return typeErr(t.GetType().Kind(), value.Kind())
    81  	} else if t.T == FixedBytesTy && t.Size != value.Len() {
    82  		return typeErr(t.GetType(), value.Type())
    83  	} else {
    84  		return nil
    85  	}
    86  }
    87  
    88  // typeErr returns a formatted type casting error.
    89  func typeErr(expected, got interface{}) error {
    90  	return fmt.Errorf("abi: cannot use %v as type %v as argument", got, expected)
    91  }