Preflight the trie length.Copy the indexes for surrogate code points into the BMP range for simple access across the entire BMP. -Preflight the trie length.Copy the indexes for surrogate code points into the BMP range for simple access across the

Trie access folding function. Copied as-is properties code in uchar.c Source Code for Linux v2.13.6. -Trie access folding function. Copied as-is properties code in uchar.c Source Code for Linux v2.13.6.

trie树的代码，实现字典树的安装和查找-Trie tree code to achieve the installation and search dictionary tree