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This patch is the part of trickledag work which is similar to the
merkledag work in commit 474b77a2bdb1c ("importer: remove `UnixfsNode`
from the balanced builder"). Two helper functions(fillTrickleRecFSNode
and FillFSNodeLayer) is introduced temporarily for modifing the Layout
functions. These two funtions will be removed when all the code of
UnixfsNode is removed in trickledag.go.

Test ipfs add and get commands to check whether get the same hash of
file after the code changes.

License: MIT
Signed-off-by: Bamvor Zhang <jian.zhang@ipfsbit.com>

After fsNodeType in NewLeafNode is supported by commit 85897b3f89301
("dag: add fsNodeType in NewLeafNode and NewLeafDataNode"). Move
comments in NewLeafNode to importer/balanced/builder.go to clarify
why TFile is used by balanced builder as leaves.

License: MIT
Signed-off-by: Bamvor Zhang <jian.zhang@ipfsbit.com>

NewLeafNode and NewLeafDataNode is introduced in commit 474b77a2bdb1c
("importer: remove `UnixfsNode` from the balanced builder"). It is
intended to return ipfs.Node instead of UnixfsNode. But it only
support creating the TFile leaf node for merkledag.

This commit add fsNodeType to above two functions and update the code
in dagbuild.go. Further patches of trickledag will make use of them
and pass TRaw to create leaf node.

License: MIT
Signed-off-by: Bamvor Zhang <jian.zhang@ipfsbit.com>

Fix/handle overflow

I didn't do this before because this datastructure *technically* isn't specific
to sharded directories but, really, that was just even more confusing.

1. It's less confusing. Murmur64 is something our library supports by truncating
a Murmur128 hash.
2. We'll only use the part we need anyways.
directory trees.

If we have a deep enough directory, we could walk off the end of the bit array.

gx publish 1.2.11

go-ipfs-files 2.0

License: MIT
Signed-off-by: Bamvor Zhang <jian.zhang@ipfsbit.com>

gx publish 1.2.7

Fix value of roughLinkSize. Add default value of DefaultLinksPerBlock.
And delete calc_test.go as it is deleted in commit bc79ae17
("refactor importer package with trickle and balanced dag generation")

License: MIT
Signed-off-by: Bamvor Zhang <jian.zhang@ipfsbit.com>

gx: update go-ipld-cbor

feat(Directory): Add EnumLinksAsync method

- Add LinkResult type to unix-fs - is an ipld Link or an error
- Add EnumLinksAsync method to Directory interface, returns channel of directory links or error
- Add EnumLinksAsync method to Shard interface in HAMT, returns channel
of directory links or error
- EnumLinks method in Shard interface in HAMT uses EnumLinksAsync now
- modify makeAsyncTrieGetLinks to use channel