lang/c/msgpack: C++ binding: implemented built-in buffer.

git-svn-id: file:///Users/frsyuki/project/msgpack-git/svn/x@55 5a5092ae-2292-43ba-b2d5-dcab9c1a2731

cpp/unpack.hpp

@@ -5,6 +5,10 @@
 #include "msgpack/zone.hpp"
 #include <stdexcept>
 
+#ifndef MSGPACK_UNPACKER_INITIAL_BUFFER_SIZE
+#define MSGPACK_UNPACKER_INITIAL_BUFFER_SIZE 8*1024
+#endif
+
 namespace msgpack {
 
 
@@ -16,26 +20,58 @@ struct unpack_error : public std::runtime_error {
 
 class unpacker {
 public:
-	unpacker(zone& z);
+	unpacker();
 	~unpacker();
+
 public:
-	size_t execute(const void* data, size_t len, size_t off);
-	bool is_finished() { return m_finished; }
+	void reserve_buffer(size_t len);
+	void* buffer();
+	size_t buffer_capacity() const;
+	void buffer_consumed(size_t len);
+	bool execute();
+	zone* release_zone();  // never throw
 	object data();
 	void reset();
+
 private:
+	zone* m_zone;
+
 	struct context;
 	context* m_ctx;
-	zone& m_zone;
-	bool m_finished;
+
+	void* m_buffer;
+	size_t m_used;
+	size_t m_free;
+	size_t m_off;
+	void expand_buffer(size_t len);
+
 private:
-	unpacker();
 	unpacker(const unpacker&);
+
 public:
 	static object unpack(const void* data, size_t len, zone& z);
 };
 
 
+inline void unpacker::reserve_buffer(size_t len)
+{
+	if(m_free >= len) { return; }
+	expand_buffer(len);
+}
+
+inline void* unpacker::buffer()
+	{ return (void*)(((char*)m_buffer)+m_used); }
+
+inline size_t unpacker::buffer_capacity() const
+	{ return m_free; }
+
+inline void unpacker::buffer_consumed(size_t len)
+{
+	m_used += len;
+	m_free -= len;
+}
+
+
 inline object unpack(const void* data, size_t len, zone& z)
 {
 	return unpacker::unpack(data, len, z);