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doc: Add comment about pack header

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Alexander Neumann 2015-04-30 00:31:21 +02:00
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commit f889c5e1ed
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doc/Design.md
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@ -102,7 +102,11 @@ The Pack's structure is as follows:
At the end of the Pack is a header, which describes the content and is
encrypted and signed. `Header_Length` is the length of the encrypted header
encoded as a is a four byte integer in little-endian encoding.
encoded as a four byte integer in little-endian encoding. Placing the header at
the end of a file allows writing the blobs in a continuous stream as soon as
they are read during the backup phase. This reduces code complexity and avoids
having to re-write a file once the pack is complete and the content and length
of the header is known.
All the blobs (`EncryptedBlob1`, `EncryptedBlobN` etc.) are signed and
encrypted independently. This enables repository reorganisation without having