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// file : xsde/cxx/buffer.cxx
// author : Boris Kolpackov <boris@codesynthesis.com>
// copyright : Copyright (c) 2005-2009 Code Synthesis Tools CC
// license : GNU GPL v2 + exceptions; see accompanying LICENSE file
#include <string.h> // memcpy
#include <xsde/cxx/buffer.hxx>
namespace xsde
{
namespace cxx
{
// c-tors
//
#ifdef XSDE_EXCEPTIONS
buffer::
buffer (size_t size)
: data_ (0), size_ (0), capacity_ (0)
{
capacity (size);
size_ = size;
}
buffer::
buffer (size_t size, size_t cap)
: data_ (0), size_ (0), capacity_ (0)
{
if (size > cap)
throw bounds ();
capacity (cap);
size_ = size;
}
buffer::
buffer (const void* data, size_t size)
: data_ (0), size_ (0), capacity_ (0)
{
capacity (size);
size_ = size;
if (size_)
memcpy (data_, data, size_);
}
buffer::
buffer (const void* data, size_t size, size_t cap)
: data_ (0), size_ (0), capacity_ (0)
{
if (size > cap)
throw bounds ();
capacity (cap);
size_ = size;
if (size_)
memcpy (data_, data, size_);
}
buffer::
buffer (void* data, size_t size, size_t cap, ownership_value)
: data_ (0), size_ (0), capacity_ (0)
{
if (size > cap)
throw bounds ();
data_ = reinterpret_cast<char*> (data);
size_ = size;
capacity_ = cap;
}
#endif // XSDE_EXCEPTIONS
//
//
#ifdef XSDE_EXCEPTIONS
bool buffer::
capacity (size_t capacity, bool copy)
{
if (size_ > capacity)
throw bounds ();
if (capacity <= capacity_)
{
return false; // Do nothing if shrinking is requested.
}
else
{
char* data = reinterpret_cast<char*> (operator new (capacity));
if (copy && size_ > 0)
memcpy (data, data_, size_);
if (data_)
operator delete (data_);
data_ = data;
capacity_ = capacity;
return true;
}
}
#else
buffer::error buffer::
capacity (size_t capacity, bool copy, bool* moved)
{
if (size_ > capacity)
return error_bounds;
if (capacity <= capacity_)
{
// Do nothing if shrinking is requested.
//
if (moved)
*moved = false;
}
else
{
char* data = reinterpret_cast<char*> (operator new (capacity));
if (data != 0)
{
if (copy && size_ > 0)
memcpy (data, data_, size_);
if (data_)
operator delete (data_);
data_ = data;
capacity_ = capacity;
if (moved)
*moved = true;
}
else
return error_no_memory;
}
return error_none;
}
#endif
}
}
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