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This adds buffer_stream.H which currently contains three classes:
buffer_ostream - for streaming bits into a variable_buffer
fixed_buffer_ostream<OT> - for streaming OT-sized chunks into a buffer
fixed_buffer_istream<OT> - for streaming OT-sized chunks out of a buffer
The classes keep track of the current write/read position so we don't have
to drag that along with the buffers manually.
There's no buffer_istream -- I didn't need that yet so haven't implemented it.
Also adds tests to fapi2_variable_buffer_test.C.
Change-Id: I53578d800c5c52c688bd761326b36a51c06dd213
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/25520
Dev-Ready: Joachim Fenkes <fenkes@de.ibm.com>
Tested-by: PPE CI
Tested-by: Jenkins Server
Reviewed-by: Brian R. Silver <bsilver@us.ibm.com>
Reviewed-by: Matt K. Light <mklight@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
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