[Courgette] Refactor: Add CourgetteFlow; improve courgette_tool.cc help text.

courgette/streams.h

Index: courgette/streams.h
diff --git a/courgette/streams.h b/courgette/streams.h
index c23d710fb0fa88a6e21eece4e9721c9335979cc0..fbc4e5317253dedc0a4adf9ce514a93a3ebd758f 100644
--- a/courgette/streams.h
+++ b/courgette/streams.h
@@ -33,6 +33,14 @@ class SinkStream;
 // Maximum number of streams in a stream set.
 static const unsigned int kMaxStreams = 10;
 
+// A simple interface for reading binary data.
+class BasicBuffer {
+ public:
+  BasicBuffer() {}

[chrisha, 2017/04/24 18:15:50]

Virtual destructor needed for interface classes.

[huangs, 2017/04/24 20:08:14]

Done. Also getting the 2 implementations to override.

+  virtual const uint8_t* data() const = 0;
+  virtual size_t length() const = 0;
+};
+
 // A SourceStream allows a region of memory to be scanned by a sequence of Read
 // operations.  The stream does not own the memory.
 class SourceStream {
@@ -234,5 +242,6 @@ class SinkStreamSet {
   DISALLOW_COPY_AND_ASSIGN(SinkStreamSet);
 };
 
-}  // namespace
+}  // namespace courgette
+
 #endif  // COURGETTE_STREAMS_H_