linux/fs/udf/unicode.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * unicode.c
 *
 * PURPOSE
 *	Routines for converting between UTF-8 and OSTA Compressed Unicode.
 *      Also handles filename mangling
 *
 * DESCRIPTION
 *	OSTA Compressed Unicode is explained in the OSTA UDF specification.
 *		http://www.osta.org/
 *	UTF-8 is explained in the IETF RFC XXXX.
 *		ftp://ftp.internic.net/rfc/rfcxxxx.txt
 *
 */

#include "udfdecl.h"

#include <linux/kernel.h>
#include <linux/string.h>	/* for memset */
#include <linux/nls.h>
#include <linux/crc-itu-t.h>
#include <linux/slab.h>

#include "udf_sb.h"

#define PLANE_SIZE …
#define UNICODE_MAX …
#define SURROGATE_MASK …
#define SURROGATE_PAIR …
#define SURROGATE_LOW …
#define SURROGATE_CHAR_BITS …
#define SURROGATE_CHAR_MASK …

#define ILLEGAL_CHAR_MARK …
#define EXT_MARK …
#define CRC_MARK …
#define EXT_SIZE …
/* Number of chars we need to store generated CRC to make filename unique */
#define CRC_LEN …

static unicode_t get_utf16_char(const uint8_t *str_i, int str_i_max_len,
				int str_i_idx, int u_ch, unicode_t *ret)
{ … }


static int udf_name_conv_char(uint8_t *str_o, int str_o_max_len,
			      int *str_o_idx,
			      const uint8_t *str_i, int str_i_max_len,
			      int *str_i_idx,
			      int u_ch, int *needsCRC,
			      int (*conv_f)(wchar_t, unsigned char *, int),
			      int translate)
{ … }

static int udf_name_from_CS0(struct super_block *sb,
			     uint8_t *str_o, int str_max_len,
			     const uint8_t *ocu, int ocu_len,
			     int translate)
{ … }

static int udf_name_to_CS0(struct super_block *sb,
			   uint8_t *ocu, int ocu_max_len,
			   const uint8_t *str_i, int str_len)
{ … }

/*
 * Convert CS0 dstring to output charset. Warning: This function may truncate
 * input string if it is too long as it is used for informational strings only
 * and it is better to truncate the string than to refuse mounting a media.
 */
int udf_dstrCS0toChar(struct super_block *sb, uint8_t *utf_o, int o_len,
		      const uint8_t *ocu_i, int i_len)
{ … }

int udf_get_filename(struct super_block *sb, const uint8_t *sname, int slen,
		     uint8_t *dname, int dlen)
{ … }

int udf_put_filename(struct super_block *sb, const uint8_t *sname, int slen,
		     uint8_t *dname, int dlen)
{ … }