[ CCode ( has_target = false ) ]
public delegate void FileChunkRequestCallback (Tox self, uint32 friend_number, uint32 file_number, uint64 position, size_t length, void* user_data)
If the length parameter is 0, the file transfer is finished, and the client's resources associated with the file number should be released. After a call with zero length, the file number can be reused for future file transfers.
If the requested position is not equal to the client's idea of the current file or stream position, it will need to seek. In case of read -once streams, the client should keep the last read chunk so that a seek back can be supported. A seek-back only ever needs to read from the last requested chunk. This happens when a chunk was requested, but the send failed. A seek-back request can occur an arbitrary number of times for any given chunk.
In response to receiving this callback, the client should call the function ` Tox.file_send_chunk` with the requested chunk. If the number of bytes sent through that function is zero, the file transfer is assumed complete. A client must send the full length of data requested with this callback.
| friend_number |
The friend number of the receiving friend for this file. |
| file_number |
The file transfer identifier returned by Tox.file_send. |
| position |
The file or stream position from which to continue reading. |
| length |
The number of bytes requested for the current chunk. |