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.: add README and LICENSE

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Vincent Batts 2015-02-20 10:29:48 -05:00
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Copyright (c) 2015 Vincent Batts, Raleigh, NC, USA
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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Overview
--------
Extend the upstream golang stdlib `archive/tar` library, to expose the raw
bytes of the TAR, rather than just the marshalled headers and file stream.
The goal being that by preserving the raw bytes of each header, padding bytes,
and the raw file payload, one could reassemble the original archive.
Caveat
======
Eventually this should detect TARs that this is not possible with.
For example stored sparse files that have "holes" in them, will be read as a
contiguous file, though the archive contents may be recorded in sparse format.
Therefore when adding the file payload to a reassembled tar, to achieve
identical output, the file payload would need be precisely re-sparsified. This
is not something I seek to fix imediately, but would rather have an alert that
precise reassembly is not possible.
Contract
========
Do not break the API of stdlib `archive/tar`
License
=======
See LICENSE