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54 lines
1.0 KiB
Go
54 lines
1.0 KiB
Go
// Copyright 2022 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
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package rangeutils
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import "strconv"
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type Range [2]int64
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func NewRange(start int64, end int64) Range {
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return [2]int64{start, end}
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}
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func (this Range) Start() int64 {
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return this[0]
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}
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func (this Range) End() int64 {
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return this[1]
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}
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func (this Range) Length() int64 {
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return this[1] - this[0] + 1
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}
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func (this Range) Convert(total int64) (newRange Range, ok bool) {
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if total <= 0 {
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return this, false
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}
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if this[0] < 0 {
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this[0] += total
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if this[0] < 0 {
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return this, false
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}
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this[1] = total - 1
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}
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if this[1] < 0 {
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this[1] = total - 1
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}
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if this[1] > total-1 {
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this[1] = total - 1
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}
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if this[0] > this[1] {
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return this, false
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}
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return this, true
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}
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// ComposeContentRangeHeader 组合Content-Range Header
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// totalSize 可能是一个数字，也可能是一个星号（*）
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func (this Range) ComposeContentRangeHeader(totalSize string) string {
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return "bytes " + strconv.FormatInt(this[0], 10) + "-" + strconv.FormatInt(this[1], 10) + "/" + totalSize
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}
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