bcb3087450
Reverting because this change started handling account balances as uint64 in the transaction pool, which is incorrect. This reverts commit af5c97aebe1d37486635521ef553cb8bd4bada13.
100 lines
2.8 KiB
Go
100 lines
2.8 KiB
Go
// Copyright 2017 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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package math
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import (
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"fmt"
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"strconv"
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)
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// Integer limit values.
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const (
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MaxInt8 = 1<<7 - 1
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MinInt8 = -1 << 7
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MaxInt16 = 1<<15 - 1
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MinInt16 = -1 << 15
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MaxInt32 = 1<<31 - 1
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MinInt32 = -1 << 31
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MaxInt64 = 1<<63 - 1
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MinInt64 = -1 << 63
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MaxUint8 = 1<<8 - 1
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MaxUint16 = 1<<16 - 1
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MaxUint32 = 1<<32 - 1
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MaxUint64 = 1<<64 - 1
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)
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// HexOrDecimal64 marshals uint64 as hex or decimal.
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type HexOrDecimal64 uint64
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// UnmarshalText implements encoding.TextUnmarshaler.
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func (i *HexOrDecimal64) UnmarshalText(input []byte) error {
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int, ok := ParseUint64(string(input))
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if !ok {
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return fmt.Errorf("invalid hex or decimal integer %q", input)
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}
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*i = HexOrDecimal64(int)
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return nil
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}
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// MarshalText implements encoding.TextMarshaler.
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func (i HexOrDecimal64) MarshalText() ([]byte, error) {
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return []byte(fmt.Sprintf("%#x", uint64(i))), nil
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}
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// ParseUint64 parses s as an integer in decimal or hexadecimal syntax.
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// Leading zeros are accepted. The empty string parses as zero.
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func ParseUint64(s string) (uint64, bool) {
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if s == "" {
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return 0, true
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}
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if len(s) >= 2 && (s[:2] == "0x" || s[:2] == "0X") {
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v, err := strconv.ParseUint(s[2:], 16, 64)
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return v, err == nil
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}
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v, err := strconv.ParseUint(s, 10, 64)
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return v, err == nil
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}
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// MustParseUint64 parses s as an integer and panics if the string is invalid.
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func MustParseUint64(s string) uint64 {
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v, ok := ParseUint64(s)
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if !ok {
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panic("invalid unsigned 64 bit integer: " + s)
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}
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return v
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}
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// NOTE: The following methods need to be optimised using either bit checking or asm
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// SafeSub returns subtraction result and whether overflow occurred.
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func SafeSub(x, y uint64) (uint64, bool) {
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return x - y, x < y
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}
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// SafeAdd returns the result and whether overflow occurred.
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func SafeAdd(x, y uint64) (uint64, bool) {
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return x + y, y > MaxUint64-x
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}
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// SafeMul returns multiplication result and whether overflow occurred.
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func SafeMul(x, y uint64) (uint64, bool) {
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if x == 0 || y == 0 {
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return 0, false
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}
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return x * y, y > MaxUint64/x
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}
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