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unicode: Add utf8-data module

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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>
This commit is contained in:
Christoph Hellwig 2021-09-15 09:00:05 +02:00 • committed by Gabriel Krisman Bertazi
parent 6ca99ce756
commit 2b3d047870
9 changed files with 126 additions and 91 deletions
Download patch file Download diff file Expand all files Collapse all files

39
fs/unicode/utf8-core.c
View file

@ -160,25 +160,45 @@ int utf8_normalize(const struct unicode_map *um, const struct qstr *str,
}
EXPORT_SYMBOL(utf8_normalize);
static const struct utf8data *find_table_version(const struct utf8data *table,
size_t nr_entries, unsigned int version)
{
size_t i = nr_entries - 1;
while (version < table[i].maxage)
i--;
if (version > table[i].maxage)
return NULL;
return &table[i];
}
struct unicode_map *utf8_load(unsigned int version)
{
struct unicode_map *um;
if (!utf8version_is_supported(version))
return ERR_PTR(-EINVAL);
um = kzalloc(sizeof(struct unicode_map), GFP_KERNEL);
if (!um)
return ERR_PTR(-ENOMEM);
um->version = version;
um->ntab[UTF8_NFDI] = utf8nfdi(version);
um->tables = symbol_request(utf8_data_table);
if (!um->tables)
goto out_free_um;
if (!utf8version_is_supported(um, version))
goto out_symbol_put;
um->ntab[UTF8_NFDI] = find_table_version(um->tables->utf8nfdidata,
um->tables->utf8nfdidata_size, um->version);
if (!um->ntab[UTF8_NFDI])
goto out_free_um;
um->ntab[UTF8_NFDICF] = utf8nfdicf(version);
goto out_symbol_put;
um->ntab[UTF8_NFDICF] = find_table_version(um->tables->utf8nfdicfdata,
um->tables->utf8nfdicfdata_size, um->version);
if (!um->ntab[UTF8_NFDICF])
goto out_free_um;
goto out_symbol_put;
return um;
out_symbol_put:
symbol_put(um->tables);
out_free_um:
kfree(um);
return ERR_PTR(-EINVAL);
@ -187,7 +207,10 @@ EXPORT_SYMBOL(utf8_load);
void utf8_unload(struct unicode_map *um)
{
kfree(um);
if (um) {
symbol_put(utf8_data_table);
kfree(um);
}
}
EXPORT_SYMBOL(utf8_unload);