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// file : cult/mm/buffer.cxx
// author : Boris Kolpackov <boris@kolpackov.net>
// copyright : Copyright (c) 2005-2010 Boris Kolpackov
// license : GNU GPL v2 + exceptions; see accompanying LICENSE file
#include <cult/mm/buffer.hxx>
#include <cstdlib> // malloc, realloc, free
#include <cstring> // memcpy
namespace Cult
{
namespace MM
{
Buffer::
~Buffer ()
{
std::free (b_);
}
Buffer::
Buffer (Size capacity, Size size) throw (ZeroCapacity, Bounds, BadAlloc)
: c_ (capacity), s_ (size), p_ (0)
{
if (c_ == 0) throw ZeroCapacity ();
if (s_ > c_) throw Bounds ();
b_ = std::malloc (c_);
if (b_ == 0) throw BadAlloc ();
}
Buffer::
Buffer (void const* p, size_t s)
: c_ (s), s_ (s), p_ (0)
{
if (c_ == 0) throw ZeroCapacity ();
b_ = std::malloc (c_);
if (b_ == 0) throw BadAlloc ();
std::memcpy (b_, p, s);
}
Buffer::
Buffer (Buffer const& b)
: c_ (b.c_), s_ (b.s_), p_ (b.p_)
{
b_ = std::malloc (c_);
if (b_ == 0) throw BadAlloc ();
std::memcpy (b_, b.b_, s_);
}
/*
Buffer&
operator= (Buffer const&)
{
return *this;
}
*/
// capacity
//
Size Buffer::
capacity () const throw ()
{
return c_;
}
Boolean Buffer::
capacity (Size c) throw (ZeroCapacity, Bounds, BadAlloc)
{
if (c == 0) throw ZeroCapacity ();
if (s_ > c) throw Bounds ();
Void* b (std::realloc (b_, c));
if (b == 0) throw BadAlloc ();
c_ = c;
if (b == b_) return false;
b_ = b;
return true;
}
// size
//
Size Buffer::
size () const throw ()
{
return s_;
}
void Buffer::
size (Size s) throw (Bounds)
{
if (s > c_ || p_ > s) throw Bounds ();
s_ = s;
}
// position
//
Index Buffer::
position () const throw ()
{
return p_;
}
Void Buffer::
position (Index p) throw (Bounds)
{
if (p > s_) throw Bounds ();
p_ = p;
}
Char const* Buffer::
data () const
{
return reinterpret_cast<Char const*> (b_);
}
Char* Buffer::
data ()
{
return reinterpret_cast<Char*> (b_);
}
}
}
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