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Mark the end of the optional payload stream, this makes sure that at
least some bytes are written to the stream (as empty archives are not
allowed by the proxmox backup server) and possible injected chunks
must be consumed.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
When a pxar archive was encoded using the split stream output
variant, access to the payload of regular files has to be redirected
to the corresponding dedicated input.
Allow to pass the split input variant to the decoder and accessor
instances to handle the split streams accordingly and decode split
stream archives.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Introduces the header type `PXAR_PAYLOAD_REF` to mark regular file
entry payloads, not encoded within the regular pxar archive but
rather redirected to a dedicated payload output writer.
It therefore substitutes the `PXAR_PAYLOAD` header type for these
entries.
The header marks the start and size for a `PayloadRef` typed object
in the archive, storing the offset to the payload header offset in the
payload stream of the dedicated payload output as well as the payload
size.
The `PayloadRef` provides the means to store, serialize and
deserialize the entry.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
In preparation for the proxmox-backup-client look-ahead caching,
where a passing around of different encoder instances with internal
references is not feasible.
Instead of creating a new encoder instance for each directory level
and keeping references to the parent state, use an internal stack.
Adds additional helper functions to solve borrow issues, when both
the state and writers have to be accessed by a mutable reference.
This is a breaking change in the pxar library API.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
add a pxarcmd test example
make 'failure' an optional dependency as we only use it in
examples right now.
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
Turn <'a> into <T: Clone + ReadAt>. We can still use `&'a
dyn ReadAt` in its place, but we can now also support using
an `Arc<File>` to create an Accessor of a 'static lifetime
for more convenient storage and reuse. This way the Accessor
can be thrown away after calling `open_root`.
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
