1 files changed, 66 insertions, 0 deletions
diff --git a/vendor/github.com/vmihailenco/bufpool/buffer_ext.go b/vendor/github.com/vmihailenco/bufpool/buffer_ext.go
new file mode 100644
index 000000000..8a904bc5c
--- /dev/null
+++ b/vendor/github.com/vmihailenco/bufpool/buffer_ext.go
@@ -0,0 +1,66 @@
+package bufpool
+
+import "bytes"
+
+// Reset resets the buffer to be empty,
+// but it retains the underlying storage for use by future writes.
+// Reset is the same as Truncate(0).
+func (b *Buffer) Reset() {
+	if b.off > cap(b.buf) {
+		panic("Buffer is used after Put")
+	}
+	b.buf = b.buf[:0]
+	b.off = 0
+	b.lastRead = opInvalid
+}
+
+func (b *Buffer) ResetBuf(buf []byte) {
+	if b.off > cap(b.buf) {
+		panic("Buffer is used after Put")
+	}
+	b.buf = buf[:0]
+	b.off = 0
+	b.lastRead = opInvalid
+}
+
+// grow grows the buffer to guarantee space for n more bytes.
+// It returns the index where bytes should be written.
+// If the buffer can't grow it will panic with ErrTooLarge.
+func (b *Buffer) grow(n int) int {
+	if b.off > cap(b.buf) {
+		panic("Buffer is used after Put")
+	}
+	m := b.Len()
+	// If buffer is empty, reset to recover space.
+	if m == 0 && b.off != 0 {
+		b.Reset()
+	}
+	// Try to grow by means of a reslice.
+	if i, ok := b.tryGrowByReslice(n); ok {
+		return i
+	}
+	if b.buf == nil && n <= smallBufferSize {
+		b.buf = make([]byte, n, smallBufferSize)
+		return 0
+	}
+	c := cap(b.buf)
+	if n <= c/2-m {
+		// We can slide things down instead of allocating a new
+		// slice. We only need m+n <= c to slide, but
+		// we instead let capacity get twice as large so we
+		// don't spend all our time copying.
+		copy(b.buf, b.buf[b.off:])
+	} else if c > maxInt-c-n {
+		panic(bytes.ErrTooLarge)
+	} else {
+		// Not enough space anywhere, we need to allocate.
+		tmp := Get(2*c + n)
+		copy(tmp.buf, b.buf[b.off:])
+		b.buf, tmp.buf = tmp.buf, b.buf
+		Put(tmp)
+	}
+	// Restore b.off and len(b.buf).
+	b.off = 0
+	b.buf = b.buf[:m+n]
+	return m
+}