more untested stuff: try to preserve piece_size when reading from disk.

first signature checking instead of hash.

libtorrent/include/libtorrent/disk_io_thread.hpp

@@ -322,6 +322,8 @@ namespace libtorrent
 		struct cached_piece_entry
 		{
 			int piece;
+            // read size
+            int piece_size;
 			// storage this piece belongs to
 			boost::intrusive_ptr<piece_manager> storage;
 			// the pointers to the block data
@@ -373,7 +375,7 @@ namespace libtorrent
 		bool is_cache_hit(cached_piece_entry& p
 			, disk_io_job const& j, mutex::scoped_lock& l);
 		int copy_from_piece(cached_piece_entry& p, bool& hit
-			, disk_io_job const& j, mutex::scoped_lock& l);
+            , disk_io_job & j, mutex::scoped_lock& l);
 
 		struct ignore_t
 		{
@@ -409,8 +411,8 @@ namespace libtorrent
 		enum cache_flags_t {
 			cache_only = 1
 		};
-		int try_read_from_cache(disk_io_job const& j, bool& hit, int flags = 0);
-		int read_piece_from_cache_and_hash(disk_io_job const& j, sha1_hash& h);
+        int try_read_from_cache(disk_io_job & j, bool& hit, int flags = 0);
+        int read_piece_from_cache_and_hash(disk_io_job & j, bool *hash_ok);
 		int cache_piece(disk_io_job const& j, cache_piece_index_t::iterator& p
 			, bool& hit, int options, mutex::scoped_lock& l);
 

libtorrent/include/libtorrent/torrent_info.hpp

@@ -253,7 +253,7 @@ namespace libtorrent
 #endif
 
 		torrent_info(torrent_info const& t, int flags = 0);
-		torrent_info(sha1_hash const& info_hash, int flags = 0);
+        torrent_info(sha1_hash const& info_hash, std::string const name, int flags = 0);
 		torrent_info(lazy_entry const& torrent_file, error_code& ec, int flags = 0);
 		torrent_info(char const* buffer, int size, error_code& ec, int flags = 0);
 		torrent_info(std::string const& filename, error_code& ec, int flags = 0);

libtorrent/src/disk_io_thread.cpp

@@ -47,6 +47,8 @@ POSSIBILITY OF SUCH DAMAGE.
 
 #include "libtorrent/time.hpp"
 
+#include "../../src/twister.h"
+
 #if TORRENT_USE_MLOCK && !defined TORRENT_WINDOWS
 #include <sys/mman.h>
 #endif
@@ -821,7 +823,7 @@ namespace libtorrent
 				return -1;
 			}
 
-			if (ret != buffer_size)
+            if (ret < 0)
 			{
 				// this means the file wasn't big enough for this read
 				p.storage->get_storage_impl()->set_error(""
@@ -829,6 +831,7 @@ namespace libtorrent
 				free_piece(p, l);
 				return -1;
 			}
+            p.piece_size = ret;
 
 			int offset = 0;
 			for (int i = 0; i < iov_counter; ++i)
@@ -852,7 +855,7 @@ namespace libtorrent
 				return -1;
 			}
 
-			if (ret != buffer_size)
+            if (ret < 0)
 			{
 				// this means the file wasn't big enough for this read
 				p.storage->get_storage_impl()->set_error(""
@@ -860,9 +863,10 @@ namespace libtorrent
 				free_piece(p, l);
 				return -1;
 			}
+            p.piece_size = ret;
 		}
 
-		TORRENT_ASSERT(ret == buffer_size);
+        TORRENT_ASSERT(ret <= buffer_size);
 		return ret;
 	}
 
@@ -1049,7 +1053,7 @@ namespace libtorrent
 	}
 
 	// cache the entire piece and hash it
-	int disk_io_thread::read_piece_from_cache_and_hash(disk_io_job const& j, sha1_hash& h)
+    int disk_io_thread::read_piece_from_cache_and_hash(disk_io_job & j, bool *hash_ok)
 	{
 		TORRENT_ASSERT(j.buffer);
 
@@ -1069,18 +1073,30 @@ namespace libtorrent
 		bool hit;
 		int ret = cache_piece(j, p, hit, ignore_cache_size, l);
 		if (ret < 0) return ret;
+        piece_size = p->piece_size;
 
 		if (!m_settings.disable_hash_checks)
         {
-			hasher ctx;
+            *hash_ok = false;
 
-			for (int i = 0; i < blocks_in_piece; ++i)
-			{
-				TORRENT_ASSERT(p->blocks[i].buf);
-				ctx.update((char const*)p->blocks[i].buf, (std::min)(piece_size, m_block_size));
-				piece_size -= m_block_size;
+            lazy_entry v;
+            int pos;
+            error_code ec;
+            if (lazy_bdecode((char const*)p->blocks[0].buf, (char const*)p->blocks[0].buf
+                + piece_size, v, ec, &pos) == 0) {
+
+                if( v.type() == lazy_entry::dict_t ) {
+                    lazy_entry const* post = v.dict_find("userpost");
+                    std::string sig = v.dict_find_string_value("sig_userpost");
+                    std::string username = j.storage->info()->name();
+                    if( post && sig.size() ) {
+                        std::pair<char const*, int> postbuf = post->data_section();
+                        *hash_ok = verifySignature(
+                                    std::string(postbuf.first,postbuf.second),
+                                    username, sig);
+                    }
+                }
             }
-			h = ctx.final();
 		}
 
         ret = copy_from_piece(const_cast<cached_piece_entry&>(*p), hit, j, l);
@@ -1146,7 +1162,7 @@ namespace libtorrent
 	}
 
 	int disk_io_thread::copy_from_piece(cached_piece_entry& p, bool& hit
-		, disk_io_job const& j, mutex::scoped_lock& l)
+        , disk_io_job & j, mutex::scoped_lock& l)
 	{
 		TORRENT_ASSERT(j.buffer);
 
@@ -1196,10 +1212,18 @@ namespace libtorrent
 			int ret = read_into_piece(p, block, 0, blocks_to_read, l);
 			hit = false;
 			if (ret < 0) return ret;
-			if (ret < size + block_offset) return -2;
+            //[MF]
+            TORRENT_ASSERT(ret == p.piece_size);
+            piece_size = ret;
+            //if (ret < size + block_offset) return -2;
 			TORRENT_ASSERT(p.blocks[block].buf);
 		}
 
+        //[MF]
+        TORRENT_ASSERT(j.buffer_size >= piece_size);
+        j.buffer_size = piece_size;
+        size = piece_size;
+
 		// build a vector of all the buffers we need to free
 		// and free them all in one go
 		std::vector<char*> buffers;
@@ -1236,7 +1260,7 @@ namespace libtorrent
         return j.buffer_size;
     }
 
-	int disk_io_thread::try_read_from_cache(disk_io_job const& j, bool& hit, int flags)
+    int disk_io_thread::try_read_from_cache(disk_io_job & j, bool& hit, int flags)
 	{
 		TORRENT_ASSERT(j.buffer);
 		TORRENT_ASSERT(j.cache_min_time >= 0);
@@ -1937,8 +1961,8 @@ namespace libtorrent
 					// since we need to check the hash, this function
 					// will ignore the cache size limit (at least for
 					// reading and hashing, not for keeping it around)
-					sha1_hash h;
-					ret = read_piece_from_cache_and_hash(j, h);
+                    bool hash_ok;
+                    ret = read_piece_from_cache_and_hash(j, &hash_ok);
 
 					// -2 means there's no space in the read cache
 					// or that the read cache is disabled
@@ -1948,7 +1972,7 @@ namespace libtorrent
 						break;
 					}
 					if (!m_settings.disable_hash_checks)
-						ret = (j.storage->info()->hash_for_piece(j.piece) == h)?ret:-3;
+                        ret = (hash_ok)?ret:-3;
 					if (ret == -3)
 					{
 						j.storage->mark_failed(j.piece);
@@ -2026,7 +2050,9 @@ namespace libtorrent
 							test_error(j);
 							break;
 						}
-						if (ret != j.buffer_size)
+                        //[MF] size is unknown beforehand
+                        j.buffer_size = ret;
+                        if (ret == 0)
 						{
 							// this means the file wasn't big enough for this read
 							j.buffer = 0;
@@ -2036,6 +2062,7 @@ namespace libtorrent
 							ret = -1;
 							break;
                         }
+
 						++m_cache_stats.blocks_read;
 						hit = false;
 					}

libtorrent/src/session_impl.cpp

@@ -5115,7 +5115,7 @@ retry:
 			if (lazy_bdecode(&params.resume_data[0], &params.resume_data[0]
 					+ params.resume_data.size(), tmp, ec, &pos) == 0
 				&& tmp.type() == lazy_entry::dict_t
-				&& (info = tmp.dict_find_dict("info")))
+                /* && (info = tmp.dict_find_dict("info")) */)
 			{
 #if defined TORRENT_VERBOSE_LOGGING || defined TORRENT_LOGGING
 				session_log("found metadata in resume data");
@@ -5123,8 +5123,12 @@ retry:
 				// verify the info-hash of the metadata stored in the resume file matches
 				// the torrent we're loading
 
+                /* [MF]
 				std::pair<char const*, int> buf = info->data_section();
 				sha1_hash resume_ih = hasher(buf.first, buf.second).final();
+                */
+                std::string info_hash = tmp.dict_find_string_value("info-hash");
+                sha1_hash resume_ih = sha1_hash(info_hash);
 
 				// if url is set, the info_hash is not actually the info-hash of the
 				// torrent, but the hash of the URL, until we have the full torrent
@@ -5136,8 +5140,8 @@ retry:
 #if defined TORRENT_VERBOSE_LOGGING || defined TORRENT_LOGGING
 					session_log("info-hash matched");
 #endif
-					params.ti = new torrent_info(resume_ih);
-
+                    params.ti = new torrent_info(resume_ih, params.name);
+ /*
 					if (params.ti->parse_info_section(*info, ec, 0))
 					{
 #if defined TORRENT_VERBOSE_LOGGING || defined TORRENT_LOGGING
@@ -5154,6 +5158,7 @@ retry:
 								, ec.message().c_str());
 #endif
 					}
+   */
 				}
 #if defined TORRENT_VERBOSE_LOGGING || defined TORRENT_LOGGING || defined TORRENT_ERROR_LOGGING
 				else

libtorrent/src/storage.cpp

@@ -2511,11 +2511,13 @@ ret:
 		TORRENT_ASSERT(have_piece == -1);
 
 		// initialization for the full check
+        /* [MF]
 		if (m_hash_to_piece.empty())
 		{
 			for (int i = 0; i < m_files.num_pieces(); ++i)
 				m_hash_to_piece.insert(std::pair<const sha1_hash, int>(m_info->hash_for_piece(i), i));
 		}
+        */
 
 		partial_hash ph;
 		int num_read = 0;

libtorrent/src/torrent.cpp

@@ -458,7 +458,7 @@ namespace libtorrent
 		}
 
 		if (!m_torrent_file)
-			m_torrent_file = (p.ti ? p.ti : new torrent_info(info_hash));
+            m_torrent_file = (p.ti ? p.ti : new torrent_info(info_hash, p.name));
 
 		m_trackers = m_torrent_file->trackers();
 		if (m_torrent_file->is_valid())
@@ -5148,12 +5148,13 @@ namespace libtorrent
 		const sha1_hash& info_hash = torrent_file().info_hash();
 		ret["info-hash"] = std::string((char*)info_hash.begin(), (char*)info_hash.end());
 
+        /* [MF] don't save metadata
 		if (valid_metadata())
 		{
 			if (m_magnet_link || (m_save_resume_flags & torrent_handle::save_info_dict))
 				ret["info"] = bdecode(&torrent_file().metadata()[0]
 					, &torrent_file().metadata()[0] + torrent_file().metadata_size());
-		}
+        } */
 
 		// blocks per piece
 		int num_blocks_per_piece =

libtorrent/src/torrent_info.cpp

@@ -829,7 +829,7 @@ namespace libtorrent
 	// will not contain any hashes, comments, creation date
 	// just the necessary to use it with piece manager
 	// used for torrents with no metadata
-	torrent_info::torrent_info(sha1_hash const& info_hash, int flags)
+    torrent_info::torrent_info(sha1_hash const& info_hash, std::string const name, int flags)
 		: m_merkle_first_leaf(0)
 		, m_piece_hashes(0)
 		, m_creation_date(time(0))
@@ -845,6 +845,7 @@ namespace libtorrent
 	    file_entry e;
 	    e.size = 1;
 	    m_files.add_file(e);
+        m_files.set_name(name);
 	}
 
 	torrent_info::~torrent_info()