Update DESIGN - dedup - deduplicating backup program
 (HTM) git clone git://bitreich.org/dedup/ git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/dedup/
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       ---
 (DIR) commit 444b9123043fedf7fffd116093babde7937cb52f
 (DIR) parent fcc899cbc1d3c835f1b28b9702e6965505ac8d66
 (HTM) Author: sin <sin@2f30.org>
       Date:   Thu, 16 May 2019 14:19:41 +0300
       
       Update DESIGN
       
       Diffstat:
         M DESIGN                              |       9 +++++----
       
       1 file changed, 5 insertions(+), 4 deletions(-)
       ---
 (DIR) diff --git a/DESIGN b/DESIGN
       @@ -24,18 +24,19 @@ bottom these are as follows:
        
        The generic layer is the one that client code interfaces with.  It is
        the top level entrypoint to the block layer.  The generic layer
       -calculates the hash of the block and passes it down to the storage
       -layer when writing a new block.
       +calculates the hash of the block and passes it down to the compression
       +layer.
        
        The compression layer will prepend a compression descriptor to the
        block and then compress the block using snappy or lz4.  It is possible
        to disable compression in which case a special descriptor is prepended
       -and the data is passed uncompressed to the layer below.
       +and the data is passed uncompressed to the encryption layer.
        
        The encryption layer will prepend an encryption descriptor to the
        block and then encrypt/authenticate the block using XChaCha20 and
        Poly1305.  It is possible to disable encryption in which case it acts
       -as a bypass with a special type of encryption descriptor.
       +as a bypass with a special type of encryption descriptor.  The block
       +is then passed to the storage layer.
        
        The storage layer will prepend a storage descriptor and append the
        descriptor and the data to a single backing file.