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ranger.go
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ranger.go
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// Copyright 2017-Present Pivotal Software, Inc. All rights reserved.
//
// 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 content
import (
"errors"
"fmt"
)
type Ranger struct {
numHunks int
}
func NewRanger(hunks int) Ranger {
return Ranger{
numHunks: hunks,
}
}
func (r Ranger) BuildRange(contentLength int64) ([]string, error) {
if contentLength == 0 {
return []string{}, errors.New("content length cannot be zero")
}
var ranges []string
hunkSize := contentLength / int64(r.numHunks)
if hunkSize == 0 {
hunkSize = 2
}
iterations := (contentLength / hunkSize)
remainder := contentLength % int64(hunkSize)
for i := int64(0); i < int64(iterations); i++ {
lowerByte := i * hunkSize
upperByte := ((i + 1) * hunkSize) - 1
if i == int64(iterations-1) {
upperByte += remainder
}
bytes := fmt.Sprintf("%d-%d", lowerByte, upperByte)
ranges = append(ranges, bytes)
}
return ranges, nil
}