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2015-06-16Replace gperf-based entity lookup with binary tree lookup.John MacFarlane
The primary advantage is a big reduction in the size of the compiled library and executable (> 100K). There should be no measurable performance difference in normal documents. I detected a slight performance hit (around 5%) in a file containing 1,000,000 entities. * Removed `src/html_unescape.gperf` and `src/html_unescape.h`. * Added `src/entities.h` (generated by `tools/make_entities_h.py`). * Added binary tree lookup functions to `houdini_html_u.c`, and use the data in `src/entities.h`.