linux/fs/hfsplus/unicode.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  linux/fs/hfsplus/unicode.c
 *
 * Copyright (C) 2001
 * Brad Boyer ([email protected])
 * (C) 2003 Ardis Technologies <[email protected]>
 *
 * Handler routines for unicode strings
 */

#include <linux/types.h>
#include <linux/nls.h>
#include "hfsplus_fs.h"
#include "hfsplus_raw.h"

/* Fold the case of a unicode char, given the 16 bit value */
/* Returns folded char, or 0 if ignorable */
static inline u16 case_fold(u16 c)
{ … }

/* Compare unicode strings, return values like normal strcmp */
int hfsplus_strcasecmp(const struct hfsplus_unistr *s1,
		       const struct hfsplus_unistr *s2)
{ … }

/* Compare names as a sequence of 16-bit unsigned integers */
int hfsplus_strcmp(const struct hfsplus_unistr *s1,
		   const struct hfsplus_unistr *s2)
{ … }


#define Hangul_SBase …
#define Hangul_LBase …
#define Hangul_VBase …
#define Hangul_TBase …
#define Hangul_SCount …
#define Hangul_LCount …
#define Hangul_VCount …
#define Hangul_TCount …
#define Hangul_NCount …


static u16 *hfsplus_compose_lookup(u16 *p, u16 cc)
{ … }

int hfsplus_uni2asc(struct super_block *sb,
		const struct hfsplus_unistr *ustr,
		char *astr, int *len_p)
{ … }

/*
 * Convert one or more ASCII characters into a single unicode character.
 * Returns the number of ASCII characters corresponding to the unicode char.
 */
static inline int asc2unichar(struct super_block *sb, const char *astr, int len,
			      wchar_t *uc)
{ … }

/* Decomposes a non-Hangul unicode character. */
static u16 *hfsplus_decompose_nonhangul(wchar_t uc, int *size)
{ … }

/*
 * Try to decompose a unicode character as Hangul. Return 0 if @uc is not
 * precomposed Hangul, otherwise return the length of the decomposition.
 *
 * This function was adapted from sample code from the Unicode Standard
 * Annex #15: Unicode Normalization Forms, version 3.2.0.
 *
 * Copyright (C) 1991-2018 Unicode, Inc.  All rights reserved.  Distributed
 * under the Terms of Use in http://www.unicode.org/copyright.html.
 */
static int hfsplus_try_decompose_hangul(wchar_t uc, u16 *result)
{ … }

/* Decomposes a single unicode character. */
static u16 *decompose_unichar(wchar_t uc, int *size, u16 *hangul_buffer)
{ … }

int hfsplus_asc2uni(struct super_block *sb,
		    struct hfsplus_unistr *ustr, int max_unistr_len,
		    const char *astr, int len)
{ … }

/*
 * Hash a string to an integer as appropriate for the HFS+ filesystem.
 * Composed unicode characters are decomposed and case-folding is performed
 * if the appropriate bits are (un)set on the superblock.
 */
int hfsplus_hash_dentry(const struct dentry *dentry, struct qstr *str)
{ … }

/*
 * Compare strings with HFS+ filename ordering.
 * Composed unicode characters are decomposed and case-folding is performed
 * if the appropriate bits are (un)set on the superblock.
 */
int hfsplus_compare_dentry(const struct dentry *dentry,
		unsigned int len, const char *str, const struct qstr *name)
{ … }