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size.go
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size.go
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// Copyright 2014 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/>.
package common
import (
"encoding/binary"
"fmt"
"math"
"strconv"
)
// StorageSize is a wrapper around a float value that supports user friendly
// formatting.
type StorageSize float64
// String implements the stringer interface.
func (s StorageSize) String() string {
if s > 1024000 {
return fmt.Sprintf("%.2f MB", s/1024000)
} else if s > 1024 {
return fmt.Sprintf("%.2f KB", s/1024)
} else {
return fmt.Sprintf("%.2f B", s)
}
}
// TerminalString implements log.TerminalStringer, formatting a string for console
// output during logging.
func (s StorageSize) TerminalString() string {
if s > 1024000 {
return fmt.Sprintf("%.2fmB", s/1024000)
} else if s > 1024 {
return fmt.Sprintf("%.2fkB", s/1024)
} else {
return fmt.Sprintf("%.2fB", s)
}
}
func (s StorageSize) Float64() float64 {
return float64(s)
}
func (s StorageSize) Bytes() []byte {
bits := math.Float64bits(float64(s))
bytes := make([]byte, 8)
binary.LittleEndian.PutUint64(bytes, bits)
return bytes
}
// str to uint64
func Str2Int64(str string) int64 {
num, err := strconv.ParseInt(str, 10, 64)
if err != nil {
return -1
}
return num
}
func Str2Uint64(str string) uint64 {
num := Str2Int64(str)
if num < 0 {
return 0
}
return uint64(num)
}
func Uint642Str(num uint64) string {
return strconv.FormatInt(int64(num), 10)
}