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;
}
}
bool binary_reader::skip(int count)
{
if (count <= get_remaining_size())
{
_ptr += count;
_remaining_size -= count;
return true;
}
else
{
dassert(false, "read beyond the end of buffer");
return false;
}
}
bool binary_reader::next(const void** data, int* size)
{
if (get_remaining_size() > 0)
{
*data = (const void*)_ptr;
*size = _remaining_size;
_ptr += _remaining_size;
_remaining_size = 0;
return true;
}
else
return false;
}
int binary_reader::read(char* buffer, int sz)
{
if (sz <= get_remaining_size())
{
memcpy((void*)buffer, _ptr, sz);
_ptr += sz;
_remaining_size -= sz;
return sz;
}
else
{
dassert(false, "read beyond the end of buffer");
return 0;
}
}
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);
_ptr += len;
_remaining_size -= len;
return len + sizeof(len);
}
else
{
dwarn("read beyond the end of buffer");
return 0;
}
}