forked from Minki/linux
6ca99ce756
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>
82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2014 SGI.
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* All rights reserved.
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*/
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#ifndef UTF8NORM_H
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#define UTF8NORM_H
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#include <linux/types.h>
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#include <linux/export.h>
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#include <linux/string.h>
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#include <linux/module.h>
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#include <linux/unicode.h>
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int utf8version_is_supported(unsigned int version);
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/*
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* Look for the correct const struct utf8data for a unicode version.
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* Returns NULL if the version requested is too new.
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*
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* Two normalization forms are supported: nfdi and nfdicf.
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*
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* nfdi:
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* - Apply unicode normalization form NFD.
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* - Remove any Default_Ignorable_Code_Point.
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*
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* nfdicf:
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* - Apply unicode normalization form NFD.
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* - Remove any Default_Ignorable_Code_Point.
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* - Apply a full casefold (C + F).
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*/
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extern const struct utf8data *utf8nfdi(unsigned int maxage);
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extern const struct utf8data *utf8nfdicf(unsigned int maxage);
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/*
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* Determine the length of the normalized from of the string,
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* excluding any terminating NULL byte.
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* Returns 0 if only ignorable code points are present.
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* Returns -1 if the input is not valid UTF-8.
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*/
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ssize_t utf8nlen(const struct unicode_map *um, enum utf8_normalization n,
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const char *s, size_t len);
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/* Needed in struct utf8cursor below. */
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#define UTF8HANGULLEAF (12)
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/*
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* Cursor structure used by the normalizer.
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*/
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struct utf8cursor {
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const struct unicode_map *um;
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enum utf8_normalization n;
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const char *s;
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const char *p;
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const char *ss;
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const char *sp;
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unsigned int len;
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unsigned int slen;
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short int ccc;
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short int nccc;
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unsigned char hangul[UTF8HANGULLEAF];
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};
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/*
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* Initialize a utf8cursor to normalize a string.
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* Returns 0 on success.
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* Returns -1 on failure.
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*/
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int utf8ncursor(struct utf8cursor *u8c, const struct unicode_map *um,
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enum utf8_normalization n, const char *s, size_t len);
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/*
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* Get the next byte in the normalization.
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* Returns a value > 0 && < 256 on success.
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* Returns 0 when the end of the normalization is reached.
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* Returns -1 if the string being normalized is not valid UTF-8.
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*/
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extern int utf8byte(struct utf8cursor *u8c);
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#endif /* UTF8NORM_H */
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