120 lines
3.3 KiB
Go
120 lines
3.3 KiB
Go
// 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/>.
|
|
|
|
// Contains all the wrappers from the math/big package.
|
|
|
|
package geth
|
|
|
|
import (
|
|
"errors"
|
|
"math/big"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
)
|
|
|
|
// A BigInt represents a signed multi-precision integer.
|
|
type BigInt struct {
|
|
bigint *big.Int
|
|
}
|
|
|
|
// NewBigInt allocates and returns a new BigInt set to x.
|
|
func NewBigInt(x int64) *BigInt {
|
|
return &BigInt{big.NewInt(x)}
|
|
}
|
|
|
|
// GetBytes returns the absolute value of x as a big-endian byte slice.
|
|
func (bi *BigInt) GetBytes() []byte {
|
|
return bi.bigint.Bytes()
|
|
}
|
|
|
|
// String returns the value of x as a formatted decimal string.
|
|
func (bi *BigInt) String() string {
|
|
return bi.bigint.String()
|
|
}
|
|
|
|
// GetInt64 returns the int64 representation of x. If x cannot be represented in
|
|
// an int64, the result is undefined.
|
|
func (bi *BigInt) GetInt64() int64 {
|
|
return bi.bigint.Int64()
|
|
}
|
|
|
|
// SetBytes interprets buf as the bytes of a big-endian unsigned integer and sets
|
|
// the big int to that value.
|
|
func (bi *BigInt) SetBytes(buf []byte) {
|
|
bi.bigint.SetBytes(common.CopyBytes(buf))
|
|
}
|
|
|
|
// SetInt64 sets the big int to x.
|
|
func (bi *BigInt) SetInt64(x int64) {
|
|
bi.bigint.SetInt64(x)
|
|
}
|
|
|
|
// Sign returns:
|
|
//
|
|
// -1 if x < 0
|
|
// 0 if x == 0
|
|
// +1 if x > 0
|
|
//
|
|
func (bi *BigInt) Sign() int {
|
|
return bi.bigint.Sign()
|
|
}
|
|
|
|
// SetString sets the big int to x.
|
|
//
|
|
// The string prefix determines the actual conversion base. A prefix of "0x" or
|
|
// "0X" selects base 16; the "0" prefix selects base 8, and a "0b" or "0B" prefix
|
|
// selects base 2. Otherwise the selected base is 10.
|
|
func (bi *BigInt) SetString(x string, base int) {
|
|
bi.bigint.SetString(x, base)
|
|
}
|
|
|
|
// BigInts represents a slice of big ints.
|
|
type BigInts struct{ bigints []*big.Int }
|
|
|
|
// NewBigInts creates a slice of uninitialized big numbers.
|
|
func NewBigInts(size int) *BigInts {
|
|
return &BigInts{
|
|
bigints: make([]*big.Int, size),
|
|
}
|
|
}
|
|
|
|
// Size returns the number of big ints in the slice.
|
|
func (bi *BigInts) Size() int {
|
|
return len(bi.bigints)
|
|
}
|
|
|
|
// Get returns the bigint at the given index from the slice.
|
|
func (bi *BigInts) Get(index int) (bigint *BigInt, _ error) {
|
|
if index < 0 || index >= len(bi.bigints) {
|
|
return nil, errors.New("index out of bounds")
|
|
}
|
|
return &BigInt{bi.bigints[index]}, nil
|
|
}
|
|
|
|
// Set sets the big int at the given index in the slice.
|
|
func (bi *BigInts) Set(index int, bigint *BigInt) error {
|
|
if index < 0 || index >= len(bi.bigints) {
|
|
return errors.New("index out of bounds")
|
|
}
|
|
bi.bigints[index] = bigint.bigint
|
|
return nil
|
|
}
|
|
|
|
// GetString returns the value of x as a formatted string in some number base.
|
|
func (bi *BigInt) GetString(base int) string {
|
|
return bi.bigint.Text(base)
|
|
}
|