c binding: add msgpack::sbuffer

git-svn-id: file:///Users/frsyuki/project/msgpack-git/svn/x@99 5a5092ae-2292-43ba-b2d5-dcab9c1a2731

cpp/sbuffer.hpp

@@ -0,0 +1,86 @@
+//
+// MessagePack for C++ simple buffer implementation
+//
+// Copyright (C) 2008-2009 FURUHASHI Sadayuki
+//
+//    Licensed under the Apache License, Version 2.0 (the "License");
+//    you may not use this file except in compliance with the License.
+//    You may obtain a copy of the License at
+//
+//        http://www.apache.org/licenses/LICENSE-2.0
+//
+//    Unless required by applicable law or agreed to in writing, software
+//    distributed under the License is distributed on an "AS IS" BASIS,
+//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//    See the License for the specific language governing permissions and
+//    limitations under the License.
+//
+#ifndef MSGPACK_SBUFFER_HPP__
+#define MSGPACK_SBUFFER_HPP__
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdexcept>
+
+namespace msgpack {
+
+
+class sbuffer {
+public:
+	sbuffer() : m_capacity(0), m_size(0), m_ptr(NULL) { }
+
+	~sbuffer()
+	{
+		free(m_ptr);
+	}
+
+public:
+	void write(const char* buf, size_t len)
+	{
+		if(m_capacity - m_size < len) {
+			size_t nsize = (m_capacity ? m_capacity*2 : 2048);
+			while(nsize < m_size + len) { nsize *= 2; }
+	
+			char* tmp = (char*)realloc(m_ptr, nsize);
+			if(!tmp) { throw std::bad_alloc(); }
+	
+			m_ptr = tmp;
+			m_capacity = nsize;
+		}
+		memcpy(m_ptr + m_size, buf, len);
+		m_size += len;
+	}
+
+	char* data()
+	{
+		return m_ptr;
+	}
+
+	size_t size() const
+	{
+		return m_size;
+	}
+
+	char* release()
+	{
+		char* tmp = m_ptr;
+		m_capacity = 0;
+		m_size = 0;
+		m_ptr = NULL;
+		return tmp;
+	}
+
+private:
+	size_t m_capacity;
+	size_t m_size;
+	char* m_ptr;
+
+private:
+	sbuffer(const sbuffer&);
+};
+
+
+}  // namespace msgpack
+
+#endif /* msgpack/sbuffer.hpp */
+