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//
// MessagePack for C++ simple buffer implementation
//
// Copyright (C) 2008-2016 FURUHASHI Sadayuki and KONDO Takatoshi
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef MSGPACK_V1_SBUFFER_HPP
#define MSGPACK_V1_SBUFFER_HPP
#include "msgpack/v1/sbuffer_decl.hpp"
#include <stdexcept>
#include <cstring>
namespace msgpack {
/// @cond
MSGPACK_API_VERSION_NAMESPACE(v1) {
/// @endcond
class sbuffer {
public:
sbuffer(size_t initsz = MSGPACK_SBUFFER_INIT_SIZE):m_size(0), m_alloc(initsz)
{
if(initsz == 0) {
m_data = MSGPACK_NULLPTR;
} else {
m_data = (char*)::malloc(initsz);
if(!m_data) {
throw std::bad_alloc();
}
}
}
~sbuffer()
{
::free(m_data);
}
#if !defined(MSGPACK_USE_CPP03)
sbuffer(const sbuffer&) = delete;
sbuffer& operator=(const sbuffer&) = delete;
sbuffer(sbuffer&& other) :
m_size(other.m_size), m_data(other.m_data), m_alloc(other.m_alloc)
{
other.m_size = other.m_alloc = 0;
other.m_data = MSGPACK_NULLPTR;
}
sbuffer& operator=(sbuffer&& other)
{
::free(m_data);
m_size = other.m_size;
m_alloc = other.m_alloc;
m_data = other.m_data;
other.m_size = other.m_alloc = 0;
other.m_data = MSGPACK_NULLPTR;
return *this;
}
#endif // !defined(MSGPACK_USE_CPP03)
void write(const char* buf, size_t len)
{
if(m_alloc - m_size < len) {
expand_buffer(len);
}
std::memcpy(m_data + m_size, buf, len);
m_size += len;
}
char* data()
{
return m_data;
}
const char* data() const
{
return m_data;
}
size_t size() const
{
return m_size;
}
char* release()
{
char* tmp = m_data;
m_size = 0;
m_data = MSGPACK_NULLPTR;
m_alloc = 0;
return tmp;
}
void clear()
{
m_size = 0;
}
private:
void expand_buffer(size_t len)
{
size_t nsize = (m_alloc > 0) ?
m_alloc * 2 : MSGPACK_SBUFFER_INIT_SIZE;
while(nsize < m_size + len) {
size_t tmp_nsize = nsize * 2;
if (tmp_nsize <= nsize) {
nsize = m_size + len;
break;
}
nsize = tmp_nsize;
}
void* tmp = ::realloc(m_data, nsize);
if(!tmp) {
throw std::bad_alloc();
}
m_data = static_cast<char*>(tmp);
m_alloc = nsize;
}
#if defined(MSGPACK_USE_CPP03)
private:
sbuffer(const sbuffer&);
sbuffer& operator=(const sbuffer&);
#endif // defined(MSGPACK_USE_CPP03)
private:
size_t m_size;
char* m_data;
size_t m_alloc;
};
/// @cond
} // MSGPACK_API_VERSION_NAMESPACE(v1)
/// @endcond
} // namespace msgpack
#endif // MSGPACK_V1_SBUFFER_HPP
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