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// file : libcommon/buffer.hxx
// license : GNU GPL v2; see accompanying LICENSE file
#ifndef LIBCOMMON_BUFFER_HXX
#define LIBCOMMON_BUFFER_HXX
#include <new>
#include <cstddef> // std::size_t
#include <cstring> // std::{memcmp,memcpy}
struct basic_buffer_base
{
~basic_buffer_base ()
{
operator delete (data_);
}
basic_buffer_base ()
: data_ (0), size_ (0)
{
}
basic_buffer_base (const void* data, std::size_t size)
: data_ (0), size_ (size)
{
data_ = operator new (size_);
std::memcpy (data_, data, size_);
}
basic_buffer_base (const basic_buffer_base& y)
: data_ (0), size_ (0)
{
assign (y.data_, y.size_);
}
basic_buffer_base&
operator= (const basic_buffer_base& y)
{
if (this != &y)
assign (y.data_, y.size_);
return *this;
}
void
assign (const void* data, std::size_t size)
{
if (size_ < size)
{
void *p (operator new (size));
operator delete (data_);
data_ = p;
}
std::memcpy (data_, data, size);
size_ = size;
}
std::size_t
size () const
{
return size_;
}
bool
operator== (const basic_buffer_base& y) const
{
return size_ == y.size_ && std::memcmp (data_, y.data_, size_) == 0;
}
protected:
void* data_;
std::size_t size_;
};
template <typename T>
struct basic_buffer: basic_buffer_base
{
basic_buffer ()
{
}
basic_buffer (const T* data, std::size_t size)
: basic_buffer_base (data, size)
{
}
T*
data ()
{
return static_cast<T*> (data_);
}
const T*
data () const
{
return static_cast<const T*> (data_);
}
};
typedef basic_buffer<char> buffer;
typedef basic_buffer<unsigned char> ubuffer;
#endif // LIBCOMMON_BUFFER_HXX
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