Extract several packages to form a public API

framework/buffer/memory.go

@@ -0,0 +1,33 @@
+package buffer
+
+import (
+	"io"
+	"io/ioutil"
+)
+
+// MemoryBuffer implements Buffer interface using byte slice.
+type MemoryBuffer struct {
+	Slice []byte
+}
+
+func (mb MemoryBuffer) Open() (io.ReadCloser, error) {
+	return NewBytesReader(mb.Slice), nil
+}
+
+func (mb MemoryBuffer) Len() int {
+	return len(mb.Slice)
+}
+
+func (mb MemoryBuffer) Remove() error {
+	return nil
+}
+
+// BufferInMemory is a convenience function which creates MemoryBuffer with
+// contents of the passed io.Reader.
+func BufferInMemory(r io.Reader) (Buffer, error) {
+	blob, err := ioutil.ReadAll(r)
+	if err != nil {
+		return nil, err
+	}
+	return MemoryBuffer{Slice: blob}, nil
+}