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//
// MessagePack for C++ deflate buffer implementation
//
// Copyright (C) 2010-2013 FURUHASHI Sadayuki and KONDO Takatoshi
//
// 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_ZBUFFER_HPP
#define MSGPACK_ZBUFFER_HPP
#include "rpc/msgpack/versioning.hpp"
#include <stdexcept>
#include <zlib.h>
#ifndef MSGPACK_ZBUFFER_RESERVE_SIZE
#define MSGPACK_ZBUFFER_RESERVE_SIZE 512
#endif
#ifndef MSGPACK_ZBUFFER_INIT_SIZE
#define MSGPACK_ZBUFFER_INIT_SIZE 8192
#endif
namespace clmdep_msgpack {
/// @cond
MSGPACK_API_VERSION_NAMESPACE(v1) {
/// @endcond
class zbuffer {
public:
zbuffer(int level = Z_DEFAULT_COMPRESSION,
size_t init_size = MSGPACK_ZBUFFER_INIT_SIZE)
: m_data(nullptr), m_init_size(init_size)
{
m_stream.zalloc = Z_NULL;
m_stream.zfree = Z_NULL;
m_stream.opaque = Z_NULL;
m_stream.next_out = Z_NULL;
m_stream.avail_out = 0;
if(deflateInit(&m_stream, level) != Z_OK) {
throw std::bad_alloc();
}
}
~zbuffer()
{
deflateEnd(&m_stream);
::free(m_data);
}
public:
void write(const char* buf, size_t len)
{
m_stream.next_in = reinterpret_cast<Bytef*>(const_cast<char*>(buf));
m_stream.avail_in = len;
while(m_stream.avail_in > 0) {
if(m_stream.avail_out < MSGPACK_ZBUFFER_RESERVE_SIZE) {
if(!expand()) {
throw std::bad_alloc();
}
}
if(deflate(&m_stream, Z_NO_FLUSH) != Z_OK) {
throw std::bad_alloc();
}
}
}
char* flush()
{
while(true) {
switch(deflate(&m_stream, Z_FINISH)) {
case Z_STREAM_END:
return m_data;
case Z_OK:
if(!expand()) {
throw std::bad_alloc();
}
break;
default:
throw std::bad_alloc();
}
}
}
char* data()
{
return m_data;
}
const char* data() const
{
return m_data;
}
size_t size() const
{
return reinterpret_cast<char*>(m_stream.next_out) - m_data;
}
void reset()
{
if(deflateReset(&m_stream) != Z_OK) {
throw std::bad_alloc();
}
reset_buffer();
}
void reset_buffer()
{
m_stream.avail_out += reinterpret_cast<char*>(m_stream.next_out) - m_data;
m_stream.next_out = reinterpret_cast<Bytef*>(m_data);
}
char* release_buffer()
{
char* tmp = m_data;
m_data = nullptr;
m_stream.next_out = nullptr;
m_stream.avail_out = 0;
return tmp;
}
private:
bool expand()
{
size_t used = reinterpret_cast<char*>(m_stream.next_out) - m_data;
size_t csize = used + m_stream.avail_out;
size_t nsize = (csize == 0) ? m_init_size : csize * 2;
char* tmp = static_cast<char*>(::realloc(m_data, nsize));
if(tmp == nullptr) {
return false;
}
m_data = tmp;
m_stream.next_out = reinterpret_cast<Bytef*>(tmp + used);
m_stream.avail_out = nsize - used;
return true;
}
#if defined(MSGPACK_USE_CPP03)
private:
zbuffer(const zbuffer&);
zbuffer& operator=(const zbuffer&);
#else // defined(MSGPACK_USE_CPP03)
zbuffer(const zbuffer&) = delete;
zbuffer& operator=(const zbuffer&) = delete;
#endif // defined(MSGPACK_USE_CPP03)
private:
z_stream m_stream;
char* m_data;
size_t m_init_size;
};
/// @cond
} // MSGPACK_API_VERSION_NAMESPACE(v1)
/// @endcond
} // namespace clmdep_msgpack
#endif /* msgpack/zbuffer.hpp */
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