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130 lines
3.6 KiB
Go
130 lines
3.6 KiB
Go
// Copyright 2016 The go-ethereum Authors
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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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// Contains all the wrappers from the math/big package.
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package geth
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import (
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"errors"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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)
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// A BigInt represents a signed multi-precision integer.
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type BigInt struct {
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bigint *big.Int
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}
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// NewBigInt allocates and returns a new BigInt set to x.
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func NewBigInt(x int64) *BigInt {
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return &BigInt{big.NewInt(x)}
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}
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// NewBigIntFromString allocates and returns a new BigInt set to x
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// interpreted in the provided base.
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func NewBigIntFromString(x string, base int) *BigInt {
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b, success := new(big.Int).SetString(x, base)
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if !success {
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return nil
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}
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return &BigInt{b}
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}
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// GetBytes returns the absolute value of x as a big-endian byte slice.
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func (bi *BigInt) GetBytes() []byte {
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return bi.bigint.Bytes()
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}
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// String returns the value of x as a formatted decimal string.
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func (bi *BigInt) String() string {
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return bi.bigint.String()
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}
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// GetInt64 returns the int64 representation of x. If x cannot be represented in
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// an int64, the result is undefined.
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func (bi *BigInt) GetInt64() int64 {
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return bi.bigint.Int64()
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}
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// SetBytes interprets buf as the bytes of a big-endian unsigned integer and sets
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// the big int to that value.
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func (bi *BigInt) SetBytes(buf []byte) {
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bi.bigint.SetBytes(common.CopyBytes(buf))
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}
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// SetInt64 sets the big int to x.
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func (bi *BigInt) SetInt64(x int64) {
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bi.bigint.SetInt64(x)
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}
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// Sign returns:
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//
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// -1 if x < 0
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// 0 if x == 0
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// +1 if x > 0
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//
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func (bi *BigInt) Sign() int {
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return bi.bigint.Sign()
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}
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// SetString sets the big int to x.
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//
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// The string prefix determines the actual conversion base. A prefix of "0x" or
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// "0X" selects base 16; the "0" prefix selects base 8, and a "0b" or "0B" prefix
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// selects base 2. Otherwise the selected base is 10.
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func (bi *BigInt) SetString(x string, base int) {
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bi.bigint.SetString(x, base)
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}
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// BigInts represents a slice of big ints.
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type BigInts struct{ bigints []*big.Int }
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// NewBigInts creates a slice of uninitialized big numbers.
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func NewBigInts(size int) *BigInts {
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return &BigInts{
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bigints: make([]*big.Int, size),
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}
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}
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// Size returns the number of big ints in the slice.
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func (bi *BigInts) Size() int {
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return len(bi.bigints)
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}
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// Get returns the bigint at the given index from the slice.
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func (bi *BigInts) Get(index int) (bigint *BigInt, _ error) {
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if index < 0 || index >= len(bi.bigints) {
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return nil, errors.New("index out of bounds")
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}
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return &BigInt{bi.bigints[index]}, nil
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}
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// Set sets the big int at the given index in the slice.
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func (bi *BigInts) Set(index int, bigint *BigInt) error {
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if index < 0 || index >= len(bi.bigints) {
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return errors.New("index out of bounds")
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}
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bi.bigints[index] = bigint.bigint
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return nil
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}
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// GetString returns the value of x as a formatted string in some number base.
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func (bi *BigInt) GetString(base int) string {
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return bi.bigint.Text(base)
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}
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