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/**
* CopiedBuffer.h
*
* If an output buffer (frame) cannot immediately be sent, we copy it to
* memory using this CopiedBuffer class
*
* @copyright 2017 Copernica BV
*/
/**
* Include guard
*/
#pragma once
/**
* Dependencies
*/
#include <memory>
#include <cstring>
#include "endian.h"
#include "frame.h"
/**
* Set up namespace
*/
namespace AMQP {
/**
* Class definition
*/
class CopiedBuffer : public OutBuffer
{
private:
/**
* The total capacity of the out buffer
* @var size_t
*/
size_t _capacity;
/**
* Pointer to the beginning of the buffer
* @var const char *
*/
char *_buffer;
/**
* Current size of the buffer
* @var size_t
*/
size_t _size = 0;
/**
* Whether the frame is synchronous
* @var bool
*/
bool _synchronous = false;
protected:
/**
* The method that adds the actual data
* @param data
* @param size
*/
virtual void append(const void *data, size_t size) override
{
// copy into the buffer
memcpy(_buffer + _size, data, size);
// update the size
_size += size;
}
public:
/**
* Constructor
* @param frame
*/
CopiedBuffer(const Frame &frame) :
_capacity(frame.totalSize()),
_buffer((char *)malloc(_capacity)),
_synchronous(frame.synchronous())
{
// tell the frame to fill this buffer
frame.fill(*this);
// append an end of frame byte (but not when still negotiating the protocol)
if (frame.needsSeparator()) add((uint8_t)206);
}
/**
* Disabled copy constructor to prevent expensive copy operations
* @param that
*/
CopiedBuffer(const CopiedBuffer &that) = delete;
/**
* Move constructor
* @param that
*/
CopiedBuffer(CopiedBuffer &&that) :
_capacity(that._capacity),
_buffer(that._buffer),
_size(that._size),
_synchronous(that._synchronous)
{
// reset the other object
that._buffer = nullptr;
that._size = 0;
that._capacity = 0;
}
/**
* Destructor
*/
virtual ~CopiedBuffer()
{
// deallocate the buffer
free(_buffer);
}
/**
* Get access to the internal buffer
* @return const char*
*/
const char *data() const
{
// expose member
return _buffer;
}
/**
* Current size of the output buffer
* @return size_t
*/
size_t size() const
{
// expose member
return _size;
}
/**
* Whether the frame is to be sent synchronously
* @return bool
*/
bool synchronous() const noexcept
{
// expose member
return _synchronous;
}
};
/**
* End of namespace
*/
}
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