Initial QSfera import

Server/vendor/github.com/oxtoacart/bpool/bytepool.go

@@ -0,0 +1,56 @@
+package bpool
+
+// BytePool implements a leaky pool of []byte in the form of a bounded
+// channel.
+type BytePool struct {
+	c chan []byte
+	w int
+	h int
+}
+
+// NewBytePool creates a new BytePool bounded to the given maxSize, with new
+// byte arrays sized based on width.
+func NewBytePool(maxSize int, width int) (bp *BytePool) {
+	return &BytePool{
+		c: make(chan []byte, maxSize),
+		w: width,
+	}
+}
+
+// Get gets a []byte from the BytePool, or creates a new one if none are
+// available in the pool.
+func (bp *BytePool) Get() (b []byte) {
+	select {
+	case b = <-bp.c:
+	// reuse existing buffer
+	default:
+		// create new buffer
+		b = make([]byte, bp.w)
+	}
+	return
+}
+
+// Put returns the given Buffer to the BytePool.
+func (bp *BytePool) Put(b []byte) {
+	if cap(b) < bp.w {
+		// someone tried to put back a too small buffer, discard it
+		return
+	}
+
+	select {
+	case bp.c <- b[:bp.w]:
+		// buffer went back into pool
+	default:
+		// buffer didn't go back into pool, just discard
+	}
+}
+
+// NumPooled returns the number of items currently pooled.
+func (bp *BytePool) NumPooled() int {
+	return len(bp.c)
+}
+
+// Width returns the width of the byte arrays in this pool.
+func (bp *BytePool) Width() (n int) {
+	return bp.w
+}