github.com/digdeepmining/go-atheios@v1.5.13-0.20180902133602-d5687a2e6f43/accounts/abi/packing.go (about)

     1  // Copyright 2016 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package abi
    18  
    19  import (
    20  	"reflect"
    21  
    22  	"github.com/atheioschain/go-atheios/common"
    23  )
    24  
    25  // packBytesSlice packs the given bytes as [L, V] as the canonical representation
    26  // bytes slice
    27  func packBytesSlice(bytes []byte, l int) []byte {
    28  	len := packNum(reflect.ValueOf(l))
    29  	return append(len, common.RightPadBytes(bytes, (l+31)/32*32)...)
    30  }
    31  
    32  // packElement packs the given reflect value according to the abi specification in
    33  // t.
    34  func packElement(t Type, reflectValue reflect.Value) []byte {
    35  	switch t.T {
    36  	case IntTy, UintTy:
    37  		return packNum(reflectValue)
    38  	case StringTy:
    39  		return packBytesSlice([]byte(reflectValue.String()), reflectValue.Len())
    40  	case AddressTy:
    41  		if reflectValue.Kind() == reflect.Array {
    42  			reflectValue = mustArrayToByteSlice(reflectValue)
    43  		}
    44  
    45  		return common.LeftPadBytes(reflectValue.Bytes(), 32)
    46  	case BoolTy:
    47  		if reflectValue.Bool() {
    48  			return common.LeftPadBytes(common.Big1.Bytes(), 32)
    49  		} else {
    50  			return common.LeftPadBytes(common.Big0.Bytes(), 32)
    51  		}
    52  	case BytesTy:
    53  		if reflectValue.Kind() == reflect.Array {
    54  			reflectValue = mustArrayToByteSlice(reflectValue)
    55  		}
    56  		return packBytesSlice(reflectValue.Bytes(), reflectValue.Len())
    57  	case FixedBytesTy, FunctionTy:
    58  		if reflectValue.Kind() == reflect.Array {
    59  			reflectValue = mustArrayToByteSlice(reflectValue)
    60  		}
    61  
    62  		return common.RightPadBytes(reflectValue.Bytes(), 32)
    63  	}
    64  	panic("abi: fatal error")
    65  }