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unicode: reduce the size of utf8data[]

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Remove the Hangul decompositions from the utf8data trie, and do
algorithmic decomposition to calculate them on the fly. To store the
decomposition the caller of utf8lookup()/utf8nlookup() must provide a
12-byte buffer, which is used to synthesize a leaf with the
decomposition. This significantly reduces the size of the utf8data[]
array.

Changes made by Gabriel:
  Rebase to mainline
  Fix checkpatch errors
  Extract robustness fixes and merge back to original mkutf8data.c patch
  Regenerate utf8data.h

Signed-off-by: Olaf Weber <olaf@sgi.com>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Olaf Weber
2019-04-25 13:49:18 -04:00
committed by Theodore Ts'o
parent 44594c2fbf
commit a8384c6879
5 changed files with 3296 additions and 12685 deletions
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4
fs/unicode/README.utf8data
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@@ -46,8 +46,8 @@ cd to this directory (fs/unicode) and run this command:
make C=../.. objdir=../.. utf8data.h.new
After sanity checking the newly generated utf8data.h.new file (the
version generated from the 11.0.0 UCD should be 13,834 lines long, and
have a total size of 1104k) and/or comparing it with the older version
version generated from the 11.0.0 UCD should be 4,061 lines long, and
have a total size of 320k) and/or comparing it with the older version
of utf8data.h, rename it to utf8data.h.
If you are a kernel developer updating to a newer version of the