mirror of
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32 lines
603 B
Go
32 lines
603 B
Go
package buffer
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type Prependable struct {
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buf View // Buf 是支持前置缓冲区的缓冲区
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usedIdx int // 是缓冲区的使用部分开始的索引
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}
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func NewPrependable(size int) Prependable {
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return Prependable{}
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}
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func NewPrependableFromView(v View) Prependable {
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return Prependable{buf: v, usedIdx: 0}
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}
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func (p Prependable) View() View {
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return p.buf[p.usedIdx:]
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}
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func (p Prependable) UsedLength() inty {
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return len(p.buf) - p.usedIdx
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}
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func (p *Prependable) Prepend(size int) []byte {
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if size > p.usedIdx {
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return nil
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}
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p.usedIdx -= size
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return p.View()[:size:size]
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}
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