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Update to use new Builder interface for creating CIDs.

update gogo protobuf

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

License: MIT
Signed-off-by: Lucas Molas <schomatis@gmail.com>

 unixfs: refactor `precalcNextBuf`

License: MIT
Signed-off-by: Lucas Molas <schomatis@gmail.com>

Extract the original `FSNode` passed inside the `ipld.Node` argument and modify
its `Blocksizes` (removing all of them and re-adding the ones that were not
truncated). In contrast, the replaced code was creating a new `FSNode` that was
not preserving some of the features of the original one.

Change `TRUNC_HASH` values in `sharness` that were created with the bug to the
correct values.

License: MIT
Signed-off-by: Lucas Molas <schomatis@gmail.com>

fixes #4518

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

always try to read ahead by at least 5 blocks in the PBDagReader

alternative to #5243 that updates go-cid and all packages that depend on it

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

Create new `loadBufNode` function to handle the `buf` logic which is unrelated
to the main `precalcNextBuf` logic of processing promises to fetch nodes.

License: MIT
Signed-off-by: Lucas Molas <schomatis@gmail.com>

Do not use `NewDagReader` just for the `RawNode` case.
Treat invalid UnixFS types in the same case.

License: MIT
Signed-off-by: Lucas Molas <schomatis@gmail.com>

License: MIT
Signed-off-by: Lucas Molas <schomatis@gmail.com>

unixfs: add a directory interface

pbdagreader: use FSNode instead of protobuf structure

License: MIT
Signed-off-by: Lucas Molas <schomatis@gmail.com>

Add a UnixFS `Directory` that hides implementation details and helps to
distinguish *what* is a UnixFS directory.

Replace the `unixfs.io.Directory` structure that contained the HAMT and basic
directory implementations (through inner pointers) with an interface containing
the same methods. Implement those methods in two clearly distinct structures for
each implementation (`BasicDirectory` and `HAMTDirectory`) avoiding pointer
logic and clearly differentiating which implementation does what.

The potential basic to HAMT transition was being hidden behind the `AddChild`
call at the UnixFS layer (changing one implementation pointer  with the other
one), it is now being explicitly done at the MFS layer.

Rename the `dirbuilder.go` file to `directory.go` and change the `Directory` MFS
attribute `dirbuilder` to `unixfsDir` to be consistent.

License: MIT
Signed-off-by: Lucas Molas <schomatis@gmail.com>