fs/udf/unicode.c - kernel/msm-4.9 - Gitiles

 /*
  * 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
  *
  * COPYRIGHT
  *	This file is distributed under the terms of the GNU General Public
  *	License (GPL). Copies of the GPL can be obtained from:
  *		ftp://prep.ai.mit.edu/pub/gnu/GPL
  *	Each contributing author retains all rights to their own work.
  */

 #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"

 static int udf_translate_to_linux(uint8_t *, uint8_t *, int, uint8_t *, int);

 static int udf_char_to_ustr(struct ustr *dest, const uint8_t *src, int strlen)
 {
 	if ((!dest) || (!src) || (!strlen) || (strlen > UDF_NAME_LEN - 2))
 		return 0;

 	memset(dest, 0, sizeof(struct ustr));
 	memcpy(dest->u_name, src, strlen);
 	dest->u_cmpID = 0x08;
 	dest->u_len = strlen;

 	return strlen;
 }

 /*
  * udf_build_ustr
  */
 int udf_build_ustr(struct ustr *dest, dstring *ptr, int size)
 {
 	int usesize;

 	if (!dest || !ptr || !size)
 		return -1;
 	BUG_ON(size < 2);

 	usesize = min_t(size_t, ptr[size - 1], sizeof(dest->u_name));
 	usesize = min(usesize, size - 2);
 	dest->u_cmpID = ptr[0];
 	dest->u_len = usesize;
 	memcpy(dest->u_name, ptr + 1, usesize);
 	memset(dest->u_name + usesize, 0, sizeof(dest->u_name) - usesize);

 	return 0;
 }

 /*
  * udf_build_ustr_exact
  */
 static int udf_build_ustr_exact(struct ustr *dest, dstring *ptr, int exactsize)
 {
 	if ((!dest) || (!ptr) || (!exactsize))
 		return -1;

 	memset(dest, 0, sizeof(struct ustr));
 	dest->u_cmpID = ptr[0];
 	dest->u_len = exactsize - 1;
 	memcpy(dest->u_name, ptr + 1, exactsize - 1);

 	return 0;
 }

 /*
  * udf_ocu_to_utf8
  *
  * PURPOSE
  *	Convert OSTA Compressed Unicode to the UTF-8 equivalent.
  *
  * PRE-CONDITIONS
  *	utf			Pointer to UTF-8 output buffer.
  *	ocu			Pointer to OSTA Compressed Unicode input buffer
  *				of size UDF_NAME_LEN bytes.
  * 				both of type "struct ustr *"
  *
  * POST-CONDITIONS
  *	<return>		Zero on success.
  *
  * HISTORY
  *	November 12, 1997 - Andrew E. Mileski
  *	Written, tested, and released.
  */
 int udf_CS0toUTF8(struct ustr *utf_o, const struct ustr *ocu_i)
 {
 	const uint8_t *ocu;
 	uint8_t cmp_id, ocu_len;
 	int i;

 	ocu_len = ocu_i->u_len;
 	if (ocu_len == 0) {
 		memset(utf_o, 0, sizeof(struct ustr));
 		return 0;
 	}

 	cmp_id = ocu_i->u_cmpID;
 	if (cmp_id != 8 && cmp_id != 16) {
 		memset(utf_o, 0, sizeof(struct ustr));
 		pr_err("unknown compression code (%d) stri=%s\n",
 		       cmp_id, ocu_i->u_name);
 		return 0;
 	}

 	ocu = ocu_i->u_name;
 	utf_o->u_len = 0;
 	for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN - 3));) {

 		/* Expand OSTA compressed Unicode to Unicode */
 		uint32_t c = ocu[i++];
 		if (cmp_id == 16)
 			c = (c << 8) | ocu[i++];

 		/* Compress Unicode to UTF-8 */
 		if (c < 0x80U)
 			utf_o->u_name[utf_o->u_len++] = (uint8_t)c;
 		else if (c < 0x800U) {
 			utf_o->u_name[utf_o->u_len++] =
 						(uint8_t)(0xc0 | (c >> 6));
 			utf_o->u_name[utf_o->u_len++] =
 						(uint8_t)(0x80 | (c & 0x3f));
 		} else {
 			utf_o->u_name[utf_o->u_len++] =
 						(uint8_t)(0xe0 | (c >> 12));
 			utf_o->u_name[utf_o->u_len++] =
 						(uint8_t)(0x80 |
 							  ((c >> 6) & 0x3f));
 			utf_o->u_name[utf_o->u_len++] =
 						(uint8_t)(0x80 | (c & 0x3f));
 		}
 	}
 	utf_o->u_cmpID = 8;

 	return utf_o->u_len;
 }

 /*
  *
  * udf_utf8_to_ocu
  *
  * PURPOSE
  *	Convert UTF-8 to the OSTA Compressed Unicode equivalent.
  *
  * DESCRIPTION
  *	This routine is only called by udf_lookup().
  *
  * PRE-CONDITIONS
  *	ocu			Pointer to OSTA Compressed Unicode output
  *				buffer of size UDF_NAME_LEN bytes.
  *	utf			Pointer to UTF-8 input buffer.
  *	utf_len			Length of UTF-8 input buffer in bytes.
  *
  * POST-CONDITIONS
  *	<return>		Zero on success.
  *
  * HISTORY
  *	November 12, 1997 - Andrew E. Mileski
  *	Written, tested, and released.
  */
 static int udf_UTF8toCS0(dstring *ocu, struct ustr *utf, int length)
 {
 	unsigned c, i, max_val, utf_char;
 	int utf_cnt, u_len;

 	memset(ocu, 0, sizeof(dstring) * length);
 	ocu[0] = 8;
 	max_val = 0xffU;

 try_again:
 	u_len = 0U;
 	utf_char = 0U;
 	utf_cnt = 0U;
 	for (i = 0U; i < utf->u_len; i++) {
 		c = (uint8_t)utf->u_name[i];

 		/* Complete a multi-byte UTF-8 character */
 		if (utf_cnt) {
 			utf_char = (utf_char << 6) | (c & 0x3fU);
 			if (--utf_cnt)
 				continue;
 		} else {
 			/* Check for a multi-byte UTF-8 character */
 			if (c & 0x80U) {
 				/* Start a multi-byte UTF-8 character */
 				if ((c & 0xe0U) == 0xc0U) {
 					utf_char = c & 0x1fU;
 					utf_cnt = 1;
 				} else if ((c & 0xf0U) == 0xe0U) {
 					utf_char = c & 0x0fU;
 					utf_cnt = 2;
 				} else if ((c & 0xf8U) == 0xf0U) {
 					utf_char = c & 0x07U;
 					utf_cnt = 3;
 				} else if ((c & 0xfcU) == 0xf8U) {
 					utf_char = c & 0x03U;
 					utf_cnt = 4;
 				} else if ((c & 0xfeU) == 0xfcU) {
 					utf_char = c & 0x01U;
 					utf_cnt = 5;
 				} else {
 					goto error_out;
 				}
 				continue;
 			} else {
 				/* Single byte UTF-8 character (most common) */
 				utf_char = c;
 			}
 		}

 		/* Choose no compression if necessary */
 		if (utf_char > max_val) {
 			if (max_val == 0xffU) {
 				max_val = 0xffffU;
 				ocu[0] = (uint8_t)0x10U;
 				goto try_again;
 			}
 			goto error_out;
 		}

 		if (max_val == 0xffffU)
 			ocu[++u_len] = (uint8_t)(utf_char >> 8);
 		ocu[++u_len] = (uint8_t)(utf_char & 0xffU);
 	}

 	if (utf_cnt) {
 error_out:
 		ocu[++u_len] = '?';
 		printk(KERN_DEBUG pr_fmt("bad UTF-8 character\n"));
 	}

 	ocu[length - 1] = (uint8_t)u_len + 1;

 	return u_len + 1;
 }

 static int udf_CS0toNLS(struct nls_table *nls, struct ustr *utf_o,
 			const struct ustr *ocu_i)
 {
 	const uint8_t *ocu;
 	uint8_t cmp_id, ocu_len;
 	int i, len;


 	ocu_len = ocu_i->u_len;
 	if (ocu_len == 0) {
 		memset(utf_o, 0, sizeof(struct ustr));
 		return 0;
 	}

 	cmp_id = ocu_i->u_cmpID;
 	if (cmp_id != 8 && cmp_id != 16) {
 		memset(utf_o, 0, sizeof(struct ustr));
 		pr_err("unknown compression code (%d) stri=%s\n",
 		       cmp_id, ocu_i->u_name);
 		return 0;
 	}

 	ocu = ocu_i->u_name;
 	utf_o->u_len = 0;
 	for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN - 3));) {
 		/* Expand OSTA compressed Unicode to Unicode */
 		uint32_t c = ocu[i++];
 		if (cmp_id == 16)
 			c = (c << 8) | ocu[i++];

 		len = nls->uni2char(c, &utf_o->u_name[utf_o->u_len],
 				    UDF_NAME_LEN - utf_o->u_len);
 		/* Valid character? */
 		if (len >= 0)
 			utf_o->u_len += len;
 		else
 			utf_o->u_name[utf_o->u_len++] = '?';
 	}
 	utf_o->u_cmpID = 8;

 	return utf_o->u_len;
 }

 static int udf_NLStoCS0(struct nls_table *nls, dstring *ocu, struct ustr *uni,
 			int length)
 {
 	int len;
 	unsigned i, max_val;
 	uint16_t uni_char;
 	int u_len;

 	memset(ocu, 0, sizeof(dstring) * length);
 	ocu[0] = 8;
 	max_val = 0xffU;

 try_again:
 	u_len = 0U;
 	for (i = 0U; i < uni->u_len; i++) {
 		len = nls->char2uni(&uni->u_name[i], uni->u_len - i, &uni_char);
 		if (!len)
 			continue;
 		/* Invalid character, deal with it */
 		if (len < 0) {
 			len = 1;
 			uni_char = '?';
 		}

 		if (uni_char > max_val) {
 			max_val = 0xffffU;
 			ocu[0] = (uint8_t)0x10U;
 			goto try_again;
 		}

 		if (max_val == 0xffffU)
 			ocu[++u_len] = (uint8_t)(uni_char >> 8);
 		ocu[++u_len] = (uint8_t)(uni_char & 0xffU);
 		i += len - 1;
 	}

 	ocu[length - 1] = (uint8_t)u_len + 1;
 	return u_len + 1;
 }

 int udf_get_filename(struct super_block *sb, uint8_t *sname, uint8_t *dname,
 		     int flen)
 {
 	struct ustr *filename, *unifilename;
 	int len = 0;

 	filename = kmalloc(sizeof(struct ustr), GFP_NOFS);
 	if (!filename)
 		return 0;

 	unifilename = kmalloc(sizeof(struct ustr), GFP_NOFS);
 	if (!unifilename)
 		goto out1;

 	if (udf_build_ustr_exact(unifilename, sname, flen))
 		goto out2;

 	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) {
 		if (!udf_CS0toUTF8(filename, unifilename)) {
 			udf_debug("Failed in udf_get_filename: sname = %s\n",
 				  sname);
 			goto out2;
 		}
 	} else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) {
 		if (!udf_CS0toNLS(UDF_SB(sb)->s_nls_map, filename,
 				  unifilename)) {
 			udf_debug("Failed in udf_get_filename: sname = %s\n",
 				  sname);
 			goto out2;
 		}
 	} else
 		goto out2;

 	len = udf_translate_to_linux(dname, filename->u_name, filename->u_len,
 				     unifilename->u_name, unifilename->u_len);
 out2:
 	kfree(unifilename);
 out1:
 	kfree(filename);
 	return len;
 }

 int udf_put_filename(struct super_block *sb, const uint8_t *sname,
 		     uint8_t *dname, int flen)
 {
 	struct ustr unifilename;
 	int namelen;

 	if (!udf_char_to_ustr(&unifilename, sname, flen))
 		return 0;

 	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) {
 		namelen = udf_UTF8toCS0(dname, &unifilename, UDF_NAME_LEN);
 		if (!namelen)
 			return 0;
 	} else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) {
 		namelen = udf_NLStoCS0(UDF_SB(sb)->s_nls_map, dname,
 					&unifilename, UDF_NAME_LEN);
 		if (!namelen)
 			return 0;
 	} else
 		return 0;

 	return namelen;
 }

 #define ILLEGAL_CHAR_MARK	'_'
 #define EXT_MARK		'.'
 #define CRC_MARK		'#'
 #define EXT_SIZE 		5

 static int udf_translate_to_linux(uint8_t *newName, uint8_t *udfName,
 				  int udfLen, uint8_t *fidName,
 				  int fidNameLen)
 {
 	int index, newIndex = 0, needsCRC = 0;
 	int extIndex = 0, newExtIndex = 0, hasExt = 0;
 	unsigned short valueCRC;
 	uint8_t curr;

 	if (udfName[0] == '.' &&
 	    (udfLen == 1 || (udfLen == 2 && udfName[1] == '.'))) {
 		needsCRC = 1;
 		newIndex = udfLen;
 		memcpy(newName, udfName, udfLen);
 	} else {
 		for (index = 0; index < udfLen; index++) {
 			curr = udfName[index];
 			if (curr == '/' || curr == 0) {
 				needsCRC = 1;
 				curr = ILLEGAL_CHAR_MARK;
 				while (index + 1 < udfLen &&
 						(udfName[index + 1] == '/' ||
 						 udfName[index + 1] == 0))
 					index++;
 			}
 			if (curr == EXT_MARK &&
 					(udfLen - index - 1) <= EXT_SIZE) {
 				if (udfLen == index + 1)
 					hasExt = 0;
 				else {
 					hasExt = 1;
 					extIndex = index;
 					newExtIndex = newIndex;
 				}
 			}
 			if (newIndex < 256)
 				newName[newIndex++] = curr;
 			else
 				needsCRC = 1;
 		}
 	}
 	if (needsCRC) {
 		uint8_t ext[EXT_SIZE];
 		int localExtIndex = 0;

 		if (hasExt) {
 			int maxFilenameLen;
 			for (index = 0;
 			     index < EXT_SIZE && extIndex + index + 1 < udfLen;
 			     index++) {
 				curr = udfName[extIndex + index + 1];

 				if (curr == '/' || curr == 0) {
 					needsCRC = 1;
 					curr = ILLEGAL_CHAR_MARK;
 					while (extIndex + index + 2 < udfLen &&
 					      (index + 1 < EXT_SIZE &&
 						(udfName[extIndex + index + 2] == '/' ||
 						 udfName[extIndex + index + 2] == 0)))
 						index++;
 				}
 				ext[localExtIndex++] = curr;
 			}
 			maxFilenameLen = 250 - localExtIndex;
 			if (newIndex > maxFilenameLen)
 				newIndex = maxFilenameLen;
 			else
 				newIndex = newExtIndex;
 		} else if (newIndex > 250)
 			newIndex = 250;
 		newName[newIndex++] = CRC_MARK;
 		valueCRC = crc_itu_t(0, fidName, fidNameLen);
 		newName[newIndex++] = hex_asc_upper_hi(valueCRC >> 8);
 		newName[newIndex++] = hex_asc_upper_lo(valueCRC >> 8);
 		newName[newIndex++] = hex_asc_upper_hi(valueCRC);
 		newName[newIndex++] = hex_asc_upper_lo(valueCRC);

 		if (hasExt) {
 			newName[newIndex++] = EXT_MARK;
 			for (index = 0; index < localExtIndex; index++)
 				newName[newIndex++] = ext[index];
 		}
 	}

 	return newIndex;
 }
	/*
	* 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
	*
	* COPYRIGHT
	* This file is distributed under the terms of the GNU General Public
	* License (GPL). Copies of the GPL can be obtained from:
	* ftp://prep.ai.mit.edu/pub/gnu/GPL
	* Each contributing author retains all rights to their own work.
	*/

	#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"

	static int udf_translate_to_linux(uint8_t , uint8_t , int, uint8_t *, int);

	static int udf_char_to_ustr(struct ustr dest, const uint8_t src, int strlen)
	{
	if ((!dest) \|\| (!src) \|\| (!strlen) \|\| (strlen > UDF_NAME_LEN - 2))
	return 0;

	memset(dest, 0, sizeof(struct ustr));
	memcpy(dest->u_name, src, strlen);
	dest->u_cmpID = 0x08;
	dest->u_len = strlen;

	return strlen;
	}

	/*
	* udf_build_ustr
	*/
	int udf_build_ustr(struct ustr dest, dstring ptr, int size)
	{
	int usesize;

	if (!dest \|\| !ptr \|\| !size)
	return -1;
	BUG_ON(size < 2);

	usesize = min_t(size_t, ptr[size - 1], sizeof(dest->u_name));
	usesize = min(usesize, size - 2);
	dest->u_cmpID = ptr[0];
	dest->u_len = usesize;
	memcpy(dest->u_name, ptr + 1, usesize);
	memset(dest->u_name + usesize, 0, sizeof(dest->u_name) - usesize);

	return 0;
	}

	/*
	* udf_build_ustr_exact
	*/
	static int udf_build_ustr_exact(struct ustr dest, dstring ptr, int exactsize)
	{
	if ((!dest) \|\| (!ptr) \|\| (!exactsize))
	return -1;

	memset(dest, 0, sizeof(struct ustr));
	dest->u_cmpID = ptr[0];
	dest->u_len = exactsize - 1;
	memcpy(dest->u_name, ptr + 1, exactsize - 1);

	return 0;
	}

	/*
	* udf_ocu_to_utf8
	*
	* PURPOSE
	* Convert OSTA Compressed Unicode to the UTF-8 equivalent.
	*
	* PRE-CONDITIONS
	* utf Pointer to UTF-8 output buffer.
	* ocu Pointer to OSTA Compressed Unicode input buffer
	* of size UDF_NAME_LEN bytes.
	* both of type "struct ustr *"
	*
	* POST-CONDITIONS
	* <return> Zero on success.
	*
	* HISTORY
	* November 12, 1997 - Andrew E. Mileski
	* Written, tested, and released.
	*/
	int udf_CS0toUTF8(struct ustr utf_o, const struct ustr ocu_i)
	{
	const uint8_t *ocu;
	uint8_t cmp_id, ocu_len;
	int i;

	ocu_len = ocu_i->u_len;
	if (ocu_len == 0) {
	memset(utf_o, 0, sizeof(struct ustr));
	return 0;
	}

	cmp_id = ocu_i->u_cmpID;
	if (cmp_id != 8 && cmp_id != 16) {
	memset(utf_o, 0, sizeof(struct ustr));
	pr_err("unknown compression code (%d) stri=%s\n",
	cmp_id, ocu_i->u_name);
	return 0;
	}

	ocu = ocu_i->u_name;
	utf_o->u_len = 0;
	for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN - 3));) {

	/* Expand OSTA compressed Unicode to Unicode */
	uint32_t c = ocu[i++];
	if (cmp_id == 16)
	c = (c << 8) \| ocu[i++];

	/* Compress Unicode to UTF-8 */
	if (c < 0x80U)
	utf_o->u_name[utf_o->u_len++] = (uint8_t)c;
	else if (c < 0x800U) {
	utf_o->u_name[utf_o->u_len++] =
	(uint8_t)(0xc0 \| (c >> 6));
	utf_o->u_name[utf_o->u_len++] =
	(uint8_t)(0x80 \| (c & 0x3f));
	} else {
	utf_o->u_name[utf_o->u_len++] =
	(uint8_t)(0xe0 \| (c >> 12));
	utf_o->u_name[utf_o->u_len++] =
	(uint8_t)(0x80 \|
	((c >> 6) & 0x3f));
	utf_o->u_name[utf_o->u_len++] =
	(uint8_t)(0x80 \| (c & 0x3f));
	}
	}
	utf_o->u_cmpID = 8;

	return utf_o->u_len;
	}

	/*
	*
	* udf_utf8_to_ocu
	*
	* PURPOSE
	* Convert UTF-8 to the OSTA Compressed Unicode equivalent.
	*
	* DESCRIPTION
	* This routine is only called by udf_lookup().
	*
	* PRE-CONDITIONS
	* ocu Pointer to OSTA Compressed Unicode output
	* buffer of size UDF_NAME_LEN bytes.
	* utf Pointer to UTF-8 input buffer.
	* utf_len Length of UTF-8 input buffer in bytes.
	*
	* POST-CONDITIONS
	* <return> Zero on success.
	*
	* HISTORY
	* November 12, 1997 - Andrew E. Mileski
	* Written, tested, and released.
	*/
	static int udf_UTF8toCS0(dstring ocu, struct ustr utf, int length)
	{
	unsigned c, i, max_val, utf_char;
	int utf_cnt, u_len;

	memset(ocu, 0, sizeof(dstring) * length);
	ocu[0] = 8;
	max_val = 0xffU;

	try_again:
	u_len = 0U;
	utf_char = 0U;
	utf_cnt = 0U;
	for (i = 0U; i < utf->u_len; i++) {
	c = (uint8_t)utf->u_name[i];

	/* Complete a multi-byte UTF-8 character */
	if (utf_cnt) {
	utf_char = (utf_char << 6) \| (c & 0x3fU);
	if (--utf_cnt)
	continue;
	} else {
	/* Check for a multi-byte UTF-8 character */
	if (c & 0x80U) {
	/* Start a multi-byte UTF-8 character */
	if ((c & 0xe0U) == 0xc0U) {
	utf_char = c & 0x1fU;
	utf_cnt = 1;
	} else if ((c & 0xf0U) == 0xe0U) {
	utf_char = c & 0x0fU;
	utf_cnt = 2;
	} else if ((c & 0xf8U) == 0xf0U) {
	utf_char = c & 0x07U;
	utf_cnt = 3;
	} else if ((c & 0xfcU) == 0xf8U) {
	utf_char = c & 0x03U;
	utf_cnt = 4;
	} else if ((c & 0xfeU) == 0xfcU) {
	utf_char = c & 0x01U;
	utf_cnt = 5;
	} else {
	goto error_out;
	}
	continue;
	} else {
	/* Single byte UTF-8 character (most common) */
	utf_char = c;
	}
	}

	/* Choose no compression if necessary */
	if (utf_char > max_val) {
	if (max_val == 0xffU) {
	max_val = 0xffffU;
	ocu[0] = (uint8_t)0x10U;
	goto try_again;
	}
	goto error_out;
	}

	if (max_val == 0xffffU)
	ocu[++u_len] = (uint8_t)(utf_char >> 8);
	ocu[++u_len] = (uint8_t)(utf_char & 0xffU);
	}

	if (utf_cnt) {
	error_out:
	ocu[++u_len] = '?';
	printk(KERN_DEBUG pr_fmt("bad UTF-8 character\n"));
	}

	ocu[length - 1] = (uint8_t)u_len + 1;

	return u_len + 1;
	}

	static int udf_CS0toNLS(struct nls_table nls, struct ustr utf_o,
	const struct ustr *ocu_i)
	{
	const uint8_t *ocu;
	uint8_t cmp_id, ocu_len;
	int i, len;


	ocu_len = ocu_i->u_len;
	if (ocu_len == 0) {
	memset(utf_o, 0, sizeof(struct ustr));
	return 0;
	}

	cmp_id = ocu_i->u_cmpID;
	if (cmp_id != 8 && cmp_id != 16) {
	memset(utf_o, 0, sizeof(struct ustr));
	pr_err("unknown compression code (%d) stri=%s\n",
	cmp_id, ocu_i->u_name);
	return 0;
	}

	ocu = ocu_i->u_name;
	utf_o->u_len = 0;
	for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN - 3));) {
	/* Expand OSTA compressed Unicode to Unicode */
	uint32_t c = ocu[i++];
	if (cmp_id == 16)
	c = (c << 8) \| ocu[i++];

	len = nls->uni2char(c, &utf_o->u_name[utf_o->u_len],
	UDF_NAME_LEN - utf_o->u_len);
	/* Valid character? */
	if (len >= 0)
	utf_o->u_len += len;
	else
	utf_o->u_name[utf_o->u_len++] = '?';
	}
	utf_o->u_cmpID = 8;

	return utf_o->u_len;
	}

	static int udf_NLStoCS0(struct nls_table nls, dstring ocu, struct ustr *uni,
	int length)
	{
	int len;
	unsigned i, max_val;
	uint16_t uni_char;
	int u_len;

	memset(ocu, 0, sizeof(dstring) * length);
	ocu[0] = 8;
	max_val = 0xffU;

	try_again:
	u_len = 0U;
	for (i = 0U; i < uni->u_len; i++) {
	len = nls->char2uni(&uni->u_name[i], uni->u_len - i, &uni_char);
	if (!len)
	continue;
	/* Invalid character, deal with it */
	if (len < 0) {
	len = 1;
	uni_char = '?';
	}

	if (uni_char > max_val) {
	max_val = 0xffffU;
	ocu[0] = (uint8_t)0x10U;
	goto try_again;
	}

	if (max_val == 0xffffU)
	ocu[++u_len] = (uint8_t)(uni_char >> 8);
	ocu[++u_len] = (uint8_t)(uni_char & 0xffU);
	i += len - 1;
	}

	ocu[length - 1] = (uint8_t)u_len + 1;
	return u_len + 1;
	}

	int udf_get_filename(struct super_block sb, uint8_t sname, uint8_t *dname,
	int flen)
	{
	struct ustr filename, unifilename;
	int len = 0;

	filename = kmalloc(sizeof(struct ustr), GFP_NOFS);
	if (!filename)
	return 0;

	unifilename = kmalloc(sizeof(struct ustr), GFP_NOFS);
	if (!unifilename)
	goto out1;

	if (udf_build_ustr_exact(unifilename, sname, flen))
	goto out2;

	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) {
	if (!udf_CS0toUTF8(filename, unifilename)) {
	udf_debug("Failed in udf_get_filename: sname = %s\n",
	sname);
	goto out2;
	}
	} else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) {
	if (!udf_CS0toNLS(UDF_SB(sb)->s_nls_map, filename,
	unifilename)) {
	udf_debug("Failed in udf_get_filename: sname = %s\n",
	sname);
	goto out2;
	}
	} else
	goto out2;

	len = udf_translate_to_linux(dname, filename->u_name, filename->u_len,
	unifilename->u_name, unifilename->u_len);
	out2:
	kfree(unifilename);
	out1:
	kfree(filename);
	return len;
	}

	int udf_put_filename(struct super_block sb, const uint8_t sname,
	uint8_t *dname, int flen)
	{
	struct ustr unifilename;
	int namelen;

	if (!udf_char_to_ustr(&unifilename, sname, flen))
	return 0;

	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) {
	namelen = udf_UTF8toCS0(dname, &unifilename, UDF_NAME_LEN);
	if (!namelen)
	return 0;
	} else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) {
	namelen = udf_NLStoCS0(UDF_SB(sb)->s_nls_map, dname,
	&unifilename, UDF_NAME_LEN);
	if (!namelen)
	return 0;
	} else
	return 0;

	return namelen;
	}

	#define ILLEGAL_CHAR_MARK '_'
	#define EXT_MARK '.'
	#define CRC_MARK '#'
	#define EXT_SIZE 5

	static int udf_translate_to_linux(uint8_t newName, uint8_t udfName,
	int udfLen, uint8_t *fidName,
	int fidNameLen)
	{
	int index, newIndex = 0, needsCRC = 0;
	int extIndex = 0, newExtIndex = 0, hasExt = 0;
	unsigned short valueCRC;
	uint8_t curr;

	if (udfName[0] == '.' &&
	(udfLen == 1 \|\| (udfLen == 2 && udfName[1] == '.'))) {
	needsCRC = 1;
	newIndex = udfLen;
	memcpy(newName, udfName, udfLen);
	} else {
	for (index = 0; index < udfLen; index++) {
	curr = udfName[index];
	if (curr == '/' \|\| curr == 0) {
	needsCRC = 1;
	curr = ILLEGAL_CHAR_MARK;
	while (index + 1 < udfLen &&
	(udfName[index + 1] == '/' \|\|
	udfName[index + 1] == 0))
	index++;
	}
	if (curr == EXT_MARK &&
	(udfLen - index - 1) <= EXT_SIZE) {
	if (udfLen == index + 1)
	hasExt = 0;
	else {
	hasExt = 1;
	extIndex = index;
	newExtIndex = newIndex;
	}
	}
	if (newIndex < 256)
	newName[newIndex++] = curr;
	else
	needsCRC = 1;
	}
	}
	if (needsCRC) {
	uint8_t ext[EXT_SIZE];
	int localExtIndex = 0;

	if (hasExt) {
	int maxFilenameLen;
	for (index = 0;
	index < EXT_SIZE && extIndex + index + 1 < udfLen;
	index++) {
	curr = udfName[extIndex + index + 1];

	if (curr == '/' \|\| curr == 0) {
	needsCRC = 1;
	curr = ILLEGAL_CHAR_MARK;
	while (extIndex + index + 2 < udfLen &&
	(index + 1 < EXT_SIZE &&
	(udfName[extIndex + index + 2] == '/' \|\|
	udfName[extIndex + index + 2] == 0)))
	index++;
	}
	ext[localExtIndex++] = curr;
	}
	maxFilenameLen = 250 - localExtIndex;
	if (newIndex > maxFilenameLen)
	newIndex = maxFilenameLen;
	else
	newIndex = newExtIndex;
	} else if (newIndex > 250)
	newIndex = 250;
	newName[newIndex++] = CRC_MARK;
	valueCRC = crc_itu_t(0, fidName, fidNameLen);
	newName[newIndex++] = hex_asc_upper_hi(valueCRC >> 8);
	newName[newIndex++] = hex_asc_upper_lo(valueCRC >> 8);
	newName[newIndex++] = hex_asc_upper_hi(valueCRC);
	newName[newIndex++] = hex_asc_upper_lo(valueCRC);

	if (hasExt) {
	newName[newIndex++] = EXT_MARK;
	for (index = 0; index < localExtIndex; index++)
	newName[newIndex++] = ext[index];
	}
	}

	return newIndex;
	}