peer_request file_storage::map_file(int file_index, size_type file_offset
, int size) const
{
TORRENT_ASSERT(file_index < num_files());
TORRENT_ASSERT(file_index >= 0);
peer_request ret;
if (file_index < 0 || file_index >= num_files())
{
ret.piece = m_num_pieces;
ret.start = 0;
ret.length = 0;
return ret;
}
size_type offset = file_offset + this->file_offset(file_index);
if (offset >= total_size())
{
ret.piece = m_num_pieces;
ret.start = 0;
ret.length = 0;
}
else
{
ret.piece = int(offset / piece_length());
ret.start = int(offset % piece_length());
ret.length = size;
if (offset + size > total_size())
ret.length = total_size() - offset;
}
return ret;
}
peer_request file_storage::map_file(int file_index, size_type file_offset
, int size) const
{
TORRENT_ASSERT(file_index < num_files());
TORRENT_ASSERT(file_index >= 0);
size_type offset = file_offset + at(file_index).offset;
peer_request ret;
ret.piece = int(offset / piece_length());
ret.start = int(offset % piece_length());
ret.length = size;
return ret;
}
int file_storage::piece_size(int index) const
{
TORRENT_ASSERT(index >= 0 && index < num_pieces());
if (index == num_pieces()-1)
{
size_type size_except_last = num_pieces() - 1;
size_except_last *= size_type(piece_length());
size_type size = total_size() - size_except_last;
TORRENT_ASSERT(size > 0);
TORRENT_ASSERT(size <= piece_length());
return int(size);
}
else
return piece_length();
}
