Andrew Stitcher created PROTON-2958:
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Summary: Implement small AMQP encodings for list/maps/arrays in
pn_data_t encoder
Key: PROTON-2958
URL: https://issues.apache.org/jira/browse/PROTON-2958
Project: Qpid Proton
Issue Type: Improvement
Components: proton-c
Affects Versions: proton-c-0.40.0
Reporter: Andrew Stitcher
Assignee: Andrew Stitcher
Fix For: proton-c-0.41.0
For very small compound structures using the small encodings can save a large
percentage of on the wire bytes (6 bytes), and for larger ones it's not
insignificant.
The simplest implementation would be to detect the small encoding is allowed at
the point we go back and fill in the size. Then shift the content bytes back 6
bytes if allowed before filling in the size and maybe fixing up the count.
Since the maximum number of bytes to shift is 255 the cost would not be too
high.
A major limitation of this approach is that arrays have to contain identical
typecodes so we assume that everything in one cannot be shortened to avoid a
mix of typecodes.
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