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Merge pull request #224 from abperiasamy/units

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This commit is contained in:
Frederick F. Kautz IV 2015-02-28 16:12:10 -08:00
commit 4d98c355c9
2 changed files with 0 additions and 217 deletions
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105
pkg/utils/unitconv/unitconv.go
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@ -1,105 +0,0 @@
/*
* Mini Object Storage, (C) 2014 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package unitconv
import (
"errors"
"fmt"
"regexp"
"strconv"
"strings"
)
// Units of various bytes in ascending order
const (
UNIT_BYTE = 1 << (10 * iota)
UNIT_KILOBYTE
UNIT_MEGABYTE
UNIT_GIGABYTE
UNIT_TERABYTE
UNIT_PETABYTE
)
// Convert bytes length in integer to human readable string
func BytesToString(bytes uint64) string {
var unit string = "B"
var value uint64 = 0
switch {
case bytes >= UNIT_TERABYTE:
unit = "TB"
value = uint64(bytes / UNIT_TERABYTE)
case bytes >= UNIT_GIGABYTE:
unit = "GB"
value = uint64(bytes / UNIT_GIGABYTE)
case bytes >= UNIT_MEGABYTE:
unit = "MB"
value = uint64(bytes / UNIT_MEGABYTE)
case bytes >= UNIT_KILOBYTE:
unit = "KB"
value = uint64(bytes / UNIT_KILOBYTE)
case bytes < UNIT_KILOBYTE && bytes >= UNIT_BYTE:
unit = "B"
value = uint64(bytes / UNIT_BYTE)
}
return fmt.Sprintf("%d%s", value, unit)
}
// Convert human readable string to bytes length in integer
func StringToBytes(s string) (uint64, error) {
var bytes uint64
var err error
bytes, err = strconv.ParseUint(s, 10, 64)
if err == nil {
return bytes, nil
}
stringPattern, err := regexp.Compile(`(?i)^(-?\d+)([BKMGT])B?$`)
if err != nil {
return 0, err
}
parts := stringPattern.FindStringSubmatch(strings.TrimSpace(s))
if len(parts) < 2 {
return 0, errors.New("Incorrect string format must be K,KB,M,MB,G,GB")
}
value, err := strconv.ParseUint(parts[1], 10, 0)
if err != nil || value < 1 {
return 0, err
}
unit := strings.ToUpper(parts[2])
switch unit {
case "T":
bytes = value * UNIT_TERABYTE
case "G":
bytes = value * UNIT_GIGABYTE
case "M":
bytes = value * UNIT_MEGABYTE
case "K":
bytes = value * UNIT_KILOBYTE
case "B":
bytes = value * UNIT_BYTE
default:
return 0, errors.New("Incorrect string format must be K,KB,M,MB,G,GB")
}
return bytes, nil
}

112
pkg/utils/unitconv/unitconv_test.go
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@ -1,112 +0,0 @@
/*
* Mini Object Storage, (C) 2014 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package unitconv
import (
"testing"
. "gopkg.in/check.v1"
)
type MySuite struct{}
var _ = Suite(&MySuite{})
func Test(t *testing.T) { TestingT(t) }
func (s *MySuite) Test(c *C) {
value := BytesToString(100 * UNIT_BYTE)
c.Assert(value, Equals, "100B")
value = BytesToString(100 * UNIT_KILOBYTE)
c.Assert(value, Equals, "100KB")
value = BytesToString(100 * UNIT_MEGABYTE)
c.Assert(value, Equals, "100MB")
value = BytesToString(100 * UNIT_GIGABYTE)
c.Assert(value, Equals, "100GB")
value = BytesToString(100 * UNIT_TERABYTE)
c.Assert(value, Equals, "100TB")
bytes, err := StringToBytes("100B")
c.Assert(err, IsNil)
c.Assert(bytes, Equals, uint64(100))
bytes, err = StringToBytes("100")
c.Assert(err, IsNil)
c.Assert(bytes, Equals, uint64(100))
bytes, err = StringToBytes("100KB")
c.Assert(err, IsNil)
c.Assert(bytes, Equals, uint64(100*UNIT_KILOBYTE))
bytes, err = StringToBytes("100K")
c.Assert(err, IsNil)
c.Assert(bytes, Equals, uint64(100*UNIT_KILOBYTE))
bytes, err = StringToBytes("100MB")
c.Assert(err, IsNil)
c.Assert(bytes, Equals, uint64(100*UNIT_MEGABYTE))
bytes, err = StringToBytes("100M")
c.Assert(err, IsNil)
c.Assert(bytes, Equals, uint64(100*UNIT_MEGABYTE))
bytes, err = StringToBytes("100GB")
c.Assert(err, IsNil)
c.Assert(bytes, Equals, uint64(100*UNIT_GIGABYTE))
bytes, err = StringToBytes("100G")
c.Assert(err, IsNil)
c.Assert(bytes, Equals, uint64(100*UNIT_GIGABYTE))
bytes, err = StringToBytes("100TB")
c.Assert(err, IsNil)
c.Assert(bytes, Equals, uint64(100*UNIT_TERABYTE))
bytes, err = StringToBytes("100T")
c.Assert(err, IsNil)
c.Assert(bytes, Equals, uint64(100*UNIT_TERABYTE))
bytes, err = StringToBytes("0")
c.Assert(err, IsNil)
c.Assert(bytes, Equals, uint64(0))
bytes, err = StringToBytes("23")
c.Assert(err, IsNil)
c.Assert(bytes, Equals, uint64(23))
bytes, err = StringToBytes("0TB")
c.Assert(err, IsNil)
c.Assert(bytes, Equals, uint64(0))
}
func (s *MySuite) TestBadInput(c *C) {
_, err := StringToBytes("")
c.Assert(err, Not(IsNil))
_, err = StringToBytes("HELLO")
c.Assert(err, Not(IsNil))
_, err = StringToBytes("-20B")
c.Assert(err, Not(IsNil))
_, err = StringToBytes("-20MB")
c.Assert(err, Not(IsNil))
}