* support torrents with more than 262000 pieces
* make tracker back-off configurable
* don't restart the swarm after downloading metadata from magnet links
* lower the default tracker retry intervals
* support banning web seeds sending corrupt data
* don't let hung outgoing connection attempts block incoming connections
* improve SSL torrent support by using SNI and a single SSL listen socket
* improved peer exchange performance by sharing incoming connections which advertize listen port
* deprecate set_ratio(), and per-peer rate limits
* add web seed support for torrents with pad files
* introduced a more scalable API for torrent status updates (post_torrent_updates()) and updated client_test to use it
* updated the API to add_torrent_params turning all bools into flags of a flags field
* added async_add_torrent() function to significantly improve performance when
adding many torrents
* change peer_states to be a bitmask (bw_limit, bw_network, bw_disk)
* changed semantics of send_buffer_watermark_factor to be specified as a percentage
* add incoming_connection_alert for logging all successful incoming connections
* feature to encrypt peer connections with a secret AES-256 key stored in .torrent file
* deprecated compact storage allocation
* close files in separate thread on systems where close() may block (Mac OS X for instance)
* don't create all directories up front when adding torrents
* support DHT scrape
* added support for fadvise/F_RDADVISE for improved disk read performance
* introduced pop_alerts() which pops the entire alert queue in a single call
* support saving metadata in resume file, enable it by default for magnet links
* support for receiving multi announce messages for local peer discovery
* added session::listen_no_system_port flag to prevent libtorrent from ever binding the listen socket to port 0
* added option to not recheck on missing or incomplete resume data
* extended stats logging with statistics=on builds
* added new session functions to more efficiently query torrent status
* added alerts for added and removed torrents
* expanded plugin interface to support session wide states
* made the metadata block requesting algorithm more robust against hash check failures
* support a separate option to use proxies for peers or not
* pausing the session now also pauses checking torrents
* moved alert queue size limit into session_settings
* added support for DHT rss feeds (storing only)
* added support for RSS feeds
* fixed up some edge cases in DHT routing table and improved unit test of it
* added error category and error codes for HTTP errors
* made the DHT implementation slightly more robust against routing table poisoning and node ID spoofing
* support chunked encoding in http downloads (http_connection)
* support adding torrents by url to the .torrent file
* support CDATA tags in xml parser
* use a python python dictionary for settings instead of session_settings object (in python bindings)
* optimized metadata transfer (magnet link) startup time (shaved off about 1 second)
* optimized swarm startup time (shaved off about 1 second)
* support DHT name lookup
* optimized memory usage of torrent_info and file_storage, forcing some API changes
around file_storage and file_entry
* support trackerid tracker extension
* graceful peer disconnect mode which finishes transactions before disconnecting peers
* support chunked encoding for web seeds
* uTP protocol support
* resistance towards certain flood attacks
* support chunked encoding for web seeds (only for BEP 19, web seeds)
* optimized session startup time
* support SSL for web seeds, through all proxies
* support extending web seeds with custom authorization and extra headers
* settings that are not changed from the default values are not saved
in the session state
* made seeding choking algorithm configurable
* deprecated setters for max connections, max half-open, upload and download
rates and unchoke slots. These are now set through session_settings
* added functions to query an individual peer's upload and download limit
* full support for BEP 21 (event=paused)
* added share-mode feature for improving share ratios
* merged all proxy settings into a single one
* improved SOCKS5 support by proxying hostname lookups
* improved support for multi-homed clients
* added feature to not count downloaded bytes from web seeds in stats
* added alert for incoming local service discovery messages
* added option to set file priorities when adding torrents
* removed the session mutex for improved performance
* added upload and download activity timer stats for torrents
* made the reuse-address flag configurable on the listen socket
* moved UDP trackers over to use a single socket
* added feature to make asserts log to a file instead of breaking the process
(production asserts)
* optimized disk I/O cache clearing
* added feature to ask a torrent if it needs to save its resume data or not
* added setting to ignore file modification time when loading resume files
* support more fine-grained torrent states between which peer sources it
announces to
* supports calculating sha1 file-hashes when creating torrents
* made the send_buffer_watermark performance warning more meaningful
* supports complete_ago extension
* dropped zlib as a dependency and builds using puff.c instead
* made the default cache size depend on available physical RAM
* added flags to torrent::status() that can filter which values are calculated
* support 'explicit read cache' which keeps a specific set of pieces
in the read cache, without implicitly caching other pieces
* support sending suggest messages based on what's in the read cache
* clear sparse flag on files that complete on windows
* support retry-after header for web seeds
* replaced boost.filesystem with custom functions
* replaced dependency on boost.thread by asio's internal thread primitives
* added support for i2p torrents
* cleaned up usage of MAX_PATH and related macros
* made it possible to build libtorrent without RTTI support
* added support to build with libgcrypt and a shipped version of libtommath
* optimized DHT routing table memory usage
* optimized disk cache to work with large caches
* support variable number of optimistic unchoke slots and to dynamically
adjust based on the total number of unchoke slots
* support for BitTyrant choker algorithm
* support for automatically start torrents when they receive an
incoming connection
* added more detailed instrumentation of the disk I/O thread