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path: root/fs/unicode/utf8-core.c
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* unicode: Add utf8-data moduleChristoph Hellwig2021-10-121-8/+31
| | | | | | | | | | | | utf8data.h contains a large database table which is an auto-generated decodification trie for the unicode normalization functions. Allow building it into a separate module. Based on a patch from Shreeya Patel <shreeya.patel@collabora.com>. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
* unicode: cache the normalization tables in struct unicode_mapChristoph Hellwig2021-10-111-18/+19
| | | | | | | | | | Instead of repeatedly looking up the version add pointers to the NFD and NFD+CF tables to struct unicode_map, and pass a unicode_map plus index to the functions using the normalization tables. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
* unicode: pass a UNICODE_AGE() tripple to utf8_loadChristoph Hellwig2021-10-111-45/+5
| | | | | | | | | Don't bother with pointless string parsing when the caller can just pass the version in the format that the core expects. Also remove the fallback to the latest version that none of the callers actually uses. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
* unicode: remove the charset field from struct unicode_mapChristoph Hellwig2021-10-111-3/+0
| | | | | | | | | It is hardcoded and only used for a f2fs sysfs file where it can be hardcoded just as easily. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Gabriel Krisman Bertazi <krisman@collabora.com> Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
* unicode: Add utf8_casefold_hashDaniel Rosenberg2020-09-101-1/+22
| | | | | | | | | | | | | | This adds a case insensitive hash function to allow taking the hash without needing to allocate a casefolded copy of the string. The existing d_hash implementations for casefolding allocate memory within rcu-walk, by avoiding it we can be more efficient and avoid worrying about a failed allocation. Signed-off-by: Daniel Rosenberg <drosen@google.com> Reviewed-by: Gabriel Krisman Bertazi <krisman@collabora.com> Reviewed-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
* unicode: make array 'token' static const, makes object smallerColin Ian King2019-09-171-1/+1
| | | | | | | | | | | | | | | | | | | Don't populate the array 'token' on the stack but instead make it static const. Makes the object code smaller by 234 bytes. Before: text data bss dec hex filename 5371 272 0 5643 160b fs/unicode/utf8-core.o After: text data bss dec hex filename 5041 368 0 5409 1521 fs/unicode/utf8-core.o (gcc version 9.2.1, amd64) Signed-off-by: Colin Ian King <colin.king@canonical.com> Reviewed-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
* ext4: optimize case-insensitive lookupsGabriel Krisman Bertazi2019-06-191-0/+28
| | | | | | | | | | Temporarily cache a casefolded version of the file name under lookup in ext4_filename, to avoid repeatedly casefolding it. I got up to 30% speedup on lookups of large directories (>100k entries), depending on the length of the string under lookup. Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
* unicode: implement higher level API for string handlingGabriel Krisman Bertazi2019-04-251-0/+187
This patch integrates the utf8n patches with some higher level API to perform UTF-8 string comparison, normalization and casefolding operations. Implemented is a variation of NFD, and casefold is performed by doing full casefold on top of NFD. These algorithms are based on the core implemented by Olaf Weber from SGI. Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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