int binary_reader::read(blob& blob)
{
int len;
if (0 == read(len))
return 0;
if (len <= get_remaining_size())
{
blob = _blob.range(static_cast<int>(_ptr - _blob.data()), len);
// optimization: zero-copy
if (!blob.buffer_ptr())
{
std::shared_ptr<char> buffer(new char[len]);
memcpy(buffer.get(), blob.data(), blob.length());
blob = ::dsn::blob(buffer, 0, blob.length());
}
_ptr += len;
_remaining_size -= len;
return len + sizeof(len);
}
else
{
dassert(false, "read beyond the end of buffer");
return 0;
}
}
