fa0101bd60
This changes the BEP protocol to use protocol buffer serialization instead of XDR, and therefore also the database format. The local discovery protocol is also updated to be protocol buffer format. GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3276 LGTM: AudriusButkevicius
60 lines
1.3 KiB
Go
60 lines
1.3 KiB
Go
// Copyright (C) 2016 The Protocol Authors.
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package protocol
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import "sync"
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type bufferPool struct {
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minSize int
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pool sync.Pool
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}
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// get returns a new buffer of the requested size
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func (p *bufferPool) get(size int) []byte {
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intf := p.pool.Get()
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if intf == nil {
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// Pool is empty, must allocate.
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return p.new(size)
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}
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bs := intf.([]byte)
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if cap(bs) < size {
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// Buffer was too small, leave it for someone else and allocate.
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p.put(bs)
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return p.new(size)
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}
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return bs[:size]
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}
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// upgrade grows the buffer to the requested size, while attempting to reuse
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// it if possible.
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func (p *bufferPool) upgrade(bs []byte, size int) []byte {
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if cap(bs) >= size {
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// Reslicing is enough, lets go!
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return bs[:size]
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}
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// It was too small. But it pack into the pool and try to get another
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// buffer.
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p.put(bs)
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return p.get(size)
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}
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// put returns the buffer to the pool
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func (p *bufferPool) put(bs []byte) {
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p.pool.Put(bs)
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}
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// new creates a new buffer of the requested size, taking the minimum
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// allocation count into account. For internal use only.
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func (p *bufferPool) new(size int) []byte {
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allocSize := size
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if allocSize < p.minSize {
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// Avoid allocating tiny buffers that we won't be able to reuse for
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// anything useful.
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allocSize = p.minSize
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}
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return make([]byte, allocSize)[:size]
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}
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