github.com/sberex/go-sberex@v1.8.2-0.20181113200658-ed96ac38f7d7/accounts/abi/numbers.go (about)

     1  // This file is part of the go-sberex library. The go-sberex library is 
     2  // free software: you can redistribute it and/or modify it under the terms 
     3  // of the GNU Lesser General Public License as published by the Free 
     4  // Software Foundation, either version 3 of the License, or (at your option)
     5  // any later version.
     6  //
     7  // The go-sberex library is distributed in the hope that it will be useful, 
     8  // but WITHOUT ANY WARRANTY; without even the implied warranty of
     9  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser 
    10  // General Public License <http://www.gnu.org/licenses/> for more details.
    11  
    12  package abi
    13  
    14  import (
    15  	"math/big"
    16  	"reflect"
    17  
    18  	"github.com/Sberex/go-sberex/common"
    19  	"github.com/Sberex/go-sberex/common/math"
    20  )
    21  
    22  var (
    23  	big_t      = reflect.TypeOf(&big.Int{})
    24  	derefbig_t = reflect.TypeOf(big.Int{})
    25  	uint8_t    = reflect.TypeOf(uint8(0))
    26  	uint16_t   = reflect.TypeOf(uint16(0))
    27  	uint32_t   = reflect.TypeOf(uint32(0))
    28  	uint64_t   = reflect.TypeOf(uint64(0))
    29  	int_t      = reflect.TypeOf(int(0))
    30  	int8_t     = reflect.TypeOf(int8(0))
    31  	int16_t    = reflect.TypeOf(int16(0))
    32  	int32_t    = reflect.TypeOf(int32(0))
    33  	int64_t    = reflect.TypeOf(int64(0))
    34  	address_t  = reflect.TypeOf(common.Address{})
    35  	int_ts     = reflect.TypeOf([]int(nil))
    36  	int8_ts    = reflect.TypeOf([]int8(nil))
    37  	int16_ts   = reflect.TypeOf([]int16(nil))
    38  	int32_ts   = reflect.TypeOf([]int32(nil))
    39  	int64_ts   = reflect.TypeOf([]int64(nil))
    40  )
    41  
    42  // U256 converts a big Int into a 256bit EVM number.
    43  func U256(n *big.Int) []byte {
    44  	return math.PaddedBigBytes(math.U256(n), 32)
    45  }
    46  
    47  // checks whether the given reflect value is signed. This also works for slices with a number type
    48  func isSigned(v reflect.Value) bool {
    49  	switch v.Type() {
    50  	case int_ts, int8_ts, int16_ts, int32_ts, int64_ts, int_t, int8_t, int16_t, int32_t, int64_t:
    51  		return true
    52  	}
    53  	return false
    54  }