69 lines
1.8 KiB
Go
69 lines
1.8 KiB
Go
// Copyright 2017 ING Bank N.V.
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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 byteconversion
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import (
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"math/big"
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"errors"
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)
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var (
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errInvalidBigInteger = errors.New("invalid ASCII for big integer")
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)
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// Decodes a byte array (ASCII encoding of comma-separated integers) into an array of big integers
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func ParseInput(in []byte) ([]*big.Int, error) {
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prevIndex := 0
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var output[] *big.Int
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for index, element := range in {
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if element == 44 {
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newInt, err := ConvertToBigInt(in[prevIndex:index])
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if err != nil {
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return nil, err
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}
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output = append(output, newInt)
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prevIndex = index + 1
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}
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}
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newInt, err := ConvertToBigInt(in[prevIndex:])
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if err != nil {
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return nil, err
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}
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return append(output, newInt), nil
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}
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// Decodes a byte array (ASCII encoding of a signed integer) into a big integer
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func ConvertToBigInt(in []byte) (*big.Int, error) {
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// Validate
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for index, element := range in {
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if !((element >= 48 && element <= 57) || (index == 0 && element == 45)) {
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return nil, errInvalidBigInteger
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}
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}
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s := string(in)
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i := new(big.Int)
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i.SetString(s, 10)
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return i, nil
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}
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