cborutil: add a buffering decoder
The sansiodecoder leaves it up to the callers to feed in data that
wasn't fully consumed last time.
This commit implements a decoder that performs buffering of
leftover chunks from the previous invocation. It otherwise
behaves identically to sansiodecoder.
Differential Revision: https://phab.mercurial-scm.org/D4434
# See http://EditorConfig.org for the specification
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[*.py]
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[*.{c,h}]
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indent_style = tab
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[*.t]
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