Adding upstream version 1.2.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

list.go

@@ -0,0 +1,47 @@
+package buffer
+
+import "math"
+
+// List is a slice of Buffers, it's the backing for NewPartition
+type List []Buffer
+
+// Len is the sum of the Len()'s of the Buffers in the List.
+func (l *List) Len() (n int64) {
+	for _, buffer := range *l {
+		if n > math.MaxInt64-buffer.Len() {
+			return math.MaxInt64
+		}
+		n += buffer.Len()
+	}
+	return n
+}
+
+// Cap is the sum of the Cap()'s of the Buffers in the List.
+func (l *List) Cap() (n int64) {
+	for _, buffer := range *l {
+		if n > math.MaxInt64-buffer.Cap() {
+			return math.MaxInt64
+		}
+		n += buffer.Cap()
+	}
+	return n
+}
+
+// Reset calls Reset() on each of the Buffers in the list.
+func (l *List) Reset() {
+	for _, buffer := range *l {
+		buffer.Reset()
+	}
+}
+
+// Push adds a Buffer to the end of the List
+func (l *List) Push(b Buffer) {
+	*l = append(*l, b)
+}
+
+// Pop removes and returns a Buffer from the front of the List
+func (l *List) Pop() (b Buffer) {
+	b = (*l)[0]
+	*l = (*l)[1:]
+	return b
+}