std::streamsize copy_impl( Source& src, Sink& snk,
std::streamsize buffer_size,
mpl::false_, mpl::true_ )
{
typedef typename char_type_of<Source>::type char_type;
typedef std::pair<char_type*, char_type*> pair_type;
detail::basic_buffer<char_type> buf(buffer_size);
pair_type p = snk.output_sequence();
std::streamsize total = 0;
std::ptrdiff_t capacity = p.second - p.first;
while (true) {
std::streamsize amt =
iostreams::read(
src,
buf.data(),
buffer_size < capacity - total ?
buffer_size :
static_cast<std::streamsize>(capacity - total)
);
if (amt == -1)
break;
std::copy(buf.data(), buf.data() + amt, p.first + total);
total += amt;
}
return total;
}
std::streamsize copy_impl( Source& src, Sink& snk,
std::streamsize buffer_size,
mpl::false_, mpl::true_ )
{ // Copy from an indirect Source to a direct Sink.
using namespace std;
typedef typename char_type_of<Source>::type char_type;
typedef pair<char_type*, char_type*> pair_type;
detail::basic_buffer<char_type> buf(buffer_size);
pair_type p = snk.output_sequence();
streamsize total = 0;
bool done = false;
while (!done) {
streamsize amt;
done = (amt = iostreams::read(src, buf.data(), buffer_size)) == -1;
std::copy(buf.data(), buf.data() + amt, p.first + total);
if (amt != -1)
total += amt;
}
return total;
}
