changelog

cTorrent advanced 3.3.2。是对 CTorrent 的一个改进版本。这是目前的最新版。

                        Enhanced CTorrent Change Log
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   Changes for "dnh3.3.2" Release

     * [1954631] Fixed incorrect ordering of dictionary keys in created
       torrent metainfo file.
     * Remove unneeded buffer allocation in bencode_buf.
     * Insure appropriate file can be closed if needed.
     * Fix double-cancel in StopDownload.
     * Incorrectly set not_interested state in RequestPiece when it
       should set m_standby, as there are still outstanding requests.
     * Corrected a problem in choke oscillation handling.
     * Avoid re-requesting the most recently requested piece from a peer,
       to reduce choke oscillation impact.
     * Set multpeer on choke oscillation, to accept the affected piece.
     * Don't print file completion details with -c if no files existed.
     * Set errno in low-level btfiles functions to facilitate better
       error messages.
     * Set ENOMEM on alloc failure in truncate routine
     * Corrected some CTCS error handling, which could produce an
       odd/incorrect message about sending the torrent.
     * Fix CTCS/Console recursion loop triggered by a network problem,
       eventually blowing out the stack.
     * Remove the .bf file when -c is used. This prevents an old bitfield
       state hanging around if the torrent is found to be complete.
     * Indicate when a file is being created, even when trying to use
       sparse files.
     * Don't print file completion details when no data is present.
     * Buffer was not freed when using -a (memory waste).
     * Additional "now" time updates to correct timing flaws. Too many
       disk accesses could be performed because the time was not being
       updated between operations.
     * Fix request URL encoding for non-ASCII locales.
     * Cache management bug due to expiration during I/O. This could
       manifest as a bad hash check or incomplete piece after download.
     * Correction in cache aging of a piece.
     * Console is unresponsive when downloading slowly (IsIdle problem).
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   Changes for "dnh3.3.1" Release

   Bug Fixes
     * [1941536] Fix restoration of terminal mode at exit.
     * Handle errors from select(). (Could cause high CPU utilization and
       unresponsiveness.)
     * [1946210] Fix incorrect string allocation sizes. (Could cause
       memory corruption or double-free errors.)
     * Delete file I/O buffers at exit.
     * Fix build warning from bitfield.cpp.
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   Changes for "dnh3.3" Release

   Features and Performance
     * Faster restart: Download of pieces that are known to be missing
       can begin immediately.
     * Added a workaround for the current lack of announce-list (multiple
       trackers) support. If the torrent file contains an announce-list,
       up to 9 alternate announce URLs (trackers) will be listed in the
       torrent information. The -u option can be used to specify the
       announce URL, either by number from the list of alternates or
       directly as a string.
     * Allow -X in conjunction with -c (for automated completion check).
     * SO_REUSEADDR is now used when -p is specified, so that the client
       can restart immediately on the given port.
     * Daemon mode (-d) now closes the standard file descriptors and
       reopens them to /dev/null. This complies with most people's
       expectations of a daemon. If -d is specified twice, standard I/O
       descriptors which are not a terminal (i.e. which have been
       redirected) are kept intact as was the previous behavior. This
       allows a fully detached process from which output can be captured.
     * Add tracker update & restart actions (from CTCS) to operator menu.
     * When creating a torrent, the following new options are available:
    -p              Private (disable peer exchange)
    -c comment      Include a comment/description
       Note that -t must now be the first option given when creating a
       torrent.
     * A new option -I allows specifying the public IP address which the
       tracker should distribute to peers.
     * Enabled changing CTCS server from CTCS.
     * When changing bandwidth limits from the console, remind the user
       that CTCS may override changes.
     * It is now possible to stop using CTCS from the console. Use the
       "S" option and give a single colon (:) as the input.
     * The "private", "comment", and "created by" fields are now
       recognized and printed (if present) when the torrent meta info is
       shown.
     * Improved on-screen advisement regarding bit field file at startup.
     * Tracker reporting data has been added to the detailed status, as
       well as failed hashes, duplicate blocks, and unwanted blocks
       counts.
     * CPU usage is printed to Verbose output when Detailed Status is
       requested from operator menu.
     * Input is now turned off if not needed. This makes things behave
       better if, for example, -x is used and the output piped to less.
     * Attempt to avoid wrapping/scrolling when printing the status line
       on a narrow terminal/window.
     * A couple of optimizations analyzing peer bitfields.
     * Bitfield operation optimizations.
     * Efficiency improvement in PendingQueue functions.
     * Improved GetDownloads efficiency.
     * Reduced memory usage when seeding, download is stalled, or using
       -x.
     * Rate measurement calculations are now cached and recomputed only
       when necessary.
     * Improved methods of determining local IP address.
     * The "ip" field is sent in the tracker address if the public IP
       address was determined.
     * Reduction of download duplication and improvement of tracker
       reporting
          + Improved piece reassignment.
               o Reassign only if proposer's queue is empty.
               o Consider any piece in the slower peer's queue.
               o Improve download rate comparison method.
               o Allow reassignment in endgame mode.
          + Improved data counting and reporting.
          + Hash check failure handling improvement
               o If hash check fails, don't re-request the same piece
                 from that peer.
               o Increased weight of hash failure.
               o Reduced peer error threshold.
          + Improved randomness of CopyShuffle.
          + Reduce duplicate data receipt
               o Avoid duplication to high-latency/slow peers.
               o When duplicating or reassigning requests, move immediate
                 incoming slices to the end of the queue.
          + Accept cancelled data from a peer if still needed.
          + Duplicate request management
               o Spread request duplication more evenly among outstanding
                 pieces.
               o Limit duplicate requests for a piece to the number of
                 outstanding slices.
               o Track the number of pieces requested as duplicates.
               o Track pieces for which slices have been requested or
                 received from multiple peers.
          + Detect a duplication inconsistency in Pending.
          + Improve choke oscillation detection and handling.
          + HealthCheck improvement to reduce redundant receipts from
            high latency peers.
     * Support systems that do not provide random(3).

   Bug Fixes
     * Completed torrent could be reported as incomplete when restarting.
       This was the reported/observed symptom; potentially it could also
       be seen as failed hash-check of downloaded pieces or uploading of
       bad data (failed hash-check at a remote peer).
     * Fixed crash which could happen when sending data without an upload
       limit.
     * Surplus bits in the last byte of a bitfield could be set.
     * Don't say "stalled" if still checking and nothing to download yet.
     * Don't allow the -n or -X options (from CTCS and console) if
       download is already complete.
     * Correct handling if -s is used with a single-file torrent and a
       directory of the specified name exists.
     * Exit with error if tracker setup fails.
     * Don't print an error when a known but inactive configuration
       option is received from CTCS.
     * Check for bad/invalid input from CTCS.
     * Fixed a bug that could corrupt (loop) the peer list, resulting in
       a hard-loop (nonresponsiveness).
     * Exit (with error) after discovering that a file is not the correct
       size at startup.
     * Fixed a bug with input prompting (affects CTCS password entry).
     * [1886549] Fix torrent creation with files over 4GB.
     * Improved CTCS status updating, and accuracy for end-of-download
       and terminating cases.
     * Upload/download now stops upon initiating Quit.
     * Improved cache allocation when download stalls or unstalls.
     * [1863204] Skip I/O for zero-length files.
     * Condition reversal in counting hash-check error against a peer.

   Code Cleanup
     * Removed declaration of unused variable cfg_max_bandwidth.
     * Rearrangement of some bitfield functions & declarations.
     * Consolidate peer error counting and handling into PeerError.
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   Changes for "dnh3.2" Release

   Features and Performance
     * Various code optimizations in cache searching and management.
     * Added proactive flushing of the oldest cache entry during idle
       time when the cache is full.
     * Flush the cache in piece order if/when the entire cache is
       flushed.
     * Prefetch uncached slices when a downloading piece is nearly
       complete.
     * Try to reduce thrashing if a small cache is specified.
     * Flushing completed pieces to disk is now given a higher priority
       than hash-checking existing pieces.
     * An informational warning is given if any filenames contain
       non-printable characters and the -T option is not used.
     * Added more methods of detecting connections from the client to
       itself.
     * If the tracker doesn't supply a peer count, count the peers it
       gives for connection instead. (This can be off by 1 if you're
       using NAT and a lame tracker gives you yourself as a peer, but you
       can't connect.)
     * Don't let initial hash-checking prevent checking tracker, ctcs,
       and console.
     * Improved efficiency of peer status/prefetch checking.
     * A 16K (default slice size) file I/O buffer is now used to
       potentially improve read/write performance.
     * Added support for systems without the strncasecmp() library
       function.

   Bug Fixes
     * Fixed a crash at program exit.
     * Fixed an error when reading an empty file.
     * Fixed a potential cache corruption issue.
     * Bad piece data wasn't always removed from cache.
     * Updated builtin SHA1 code to include a fix or two and take
       advantage of autoconf (including endianness; cross-compilers take
       note).
     * Improved/corrected the method of determining the local IP address.
     * Corrected the comparison of local and peer IP address.
     * Corrected peer connection failure detection (could cause peer
       disconnects).
     * Corrected a potential problem in the peer handshake handling code.
     * Corrected a problem that could prevent or delay receiving the
       peer's bitfield.
     * Fixed a problem with handling of tracker response data. Now
       separate send and receive buffers are used for tracker
       communication.
     * Corrected end-of-header check in httpencode.cpp (tracker
       response).
     * Various timing-related fixes to improve maximum transfer rates.
     * Avoid running too many idle-time tasks at a time.
     * Improved the upload timing when not using cache.
     * Adjusted the CTCS seed time (-e) option processing to make the
       result more intuitive (it could be perceived as being an hour
       off).
     * Fixed a problem where the torrent metainfo would not be shown if
       input was redirected. Also added input EOF/error detection for
       cases not previously covered.
     * Fix console input on Solaris (and potentially some other
       platforms).

   Code Cleanup
     * Additional verbose output for cache management.
     * Moved strnstr() from httpencode.cpp to compat.c.
     * Improve handling of tracker contact intervals.
     * Optimized PeekMessage function.
     * Removed unnecessary headers from downloader.cpp.
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   Changes for "dnh3.1" Release

   Features and Performance