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First implementation of per-chunk CRC32 check. This is triggered

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- by the right-click+Force Check on files.
- when a global hash on a downloaded file does not match the announced hash.

When a CRC map check is ordered, the CRC map is requested to one of the sources for the current file download.
When received, all downloaded chunks are checked w.r.t the reference CRC and marked as not done if the CRCs do not match.
The exchange of CRC32 map and requests has been tested, as well as CRC map checking during download (force check).

To be implemented soon:
    - caching of CRC32 maps (although these are fast to compute)
    - CRC32 map packets for normal downloads. For now these work only for turtle tunnels.
    - handling of errors if the CRC never comes. For now, the download will stay stuck in "Checking..." mode.

So, don't play too much with the force check feature for now...





git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@3310 b45a01b8-16f6-495d-af2f-9b41ad6348cc
This commit is contained in:
csoler 2010-07-21 23:14:10 +00:00
parent db034b026f
commit 8bfc74485a
27 changed files with 1012 additions and 118 deletions
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14
libretroshare/src/ft/ftfilecreator.h
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@ -64,13 +64,11 @@ class ftFileCreator: public ftFileProvider
bool hashReceivedData(std::string& hash) ;
// Computes a CRC32 map of all chunks, for comparison with reference, and re-starting invalid chunks.
//
bool CRC32ReceivedData(CRC32Map& crc_map) ;
// Checks the CRC32 of all chunks against the given CRC32 map. Re-flag the bad chunks as being void.
// bad_chunks: count of achieved chunks that don't match the CRC
// incomplete_chunks: count of any bad or not yet downloaded chunk
//
bool crossCheckChunkMap(const CRC32Map& crc_map) ;
bool crossCheckChunkMap(const CRC32Map& ref,uint32_t& bad_chunks,uint32_t& incomplete_chunks) ;
/*
* creation functions for FileCreator
*/
@ -107,6 +105,12 @@ class ftFileCreator: public ftFileProvider
virtual void getAvailabilityMap(CompressedChunkMap& cmap) ;
void setAvailabilityMap(const CompressedChunkMap& cmap) ;
// Provides a complete per-chunk CRC32 map to client who want to check their data.
// This is overloads ftFileProvider, but returns false, because we can't ensure that unchecked chunks
// will provide a CRC32 that is faithful to the original hash.
//
virtual bool getCRC32Map(CRC32Map& crc_map) { return false ; }
// This is called when receiving the availability map from a source peer, for the file being handled.
//
void setSourceMap(const std::string& peer_id,const CompressedChunkMap& map) ;