/*

   *   Copyright (C) International Business Machines Corp., 2000-2002
   *   Portions Copyright (C) Christoph Hellwig, 2001-2002

   *
   *   This program is free software;  you can redistribute it and/or modify
   *   it under the terms of the GNU General Public License as published by

   *   the Free Software Foundation; either version 2 of the License, or

   *   (at your option) any later version.

   *

   *   This program is distributed in the hope that it will be useful,
   *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
   *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
   *   the GNU General Public License for more details.
   *
   *   You should have received a copy of the GNU General Public License

   *   along with this program;  if not, write to the Free Software

   *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
   */
  #ifndef _H_JFS_UNICODE
  #define _H_JFS_UNICODE

  #include <linux/slab.h>

  #include <asm/byteorder.h>
  #include "jfs_types.h"
  
  typedef struct {
  	wchar_t start;
  	wchar_t end;
  	signed char *table;
  } UNICASERANGE;
  
  extern signed char UniUpperTable[512];
  extern UNICASERANGE UniUpperRange[];
  extern int get_UCSname(struct component_name *, struct dentry *);
  extern int jfs_strfromUCS_le(char *, const __le16 *, int, struct nls_table *);
  
  #define free_UCSname(COMP) kfree((COMP)->name)
  
  /*
   * UniStrcpy:  Copy a string
   */
  static inline wchar_t *UniStrcpy(wchar_t * ucs1, const wchar_t * ucs2)
  {
  	wchar_t *anchor = ucs1;	/* save the start of result string */
  
  	while ((*ucs1++ = *ucs2++));
  	return anchor;
  }
  
  
  
  /*
   * UniStrncpy:  Copy length limited string with pad
   */
  static inline __le16 *UniStrncpy_le(__le16 * ucs1, const __le16 * ucs2,
  				  size_t n)
  {
  	__le16 *anchor = ucs1;
  
  	while (n-- && *ucs2)	/* Copy the strings */
  		*ucs1++ = *ucs2++;
  
  	n++;
  	while (n--)		/* Pad with nulls */
  		*ucs1++ = 0;
  	return anchor;
  }
  
  /*
   * UniStrncmp_le:  Compare length limited string - native to little-endian
   */
  static inline int UniStrncmp_le(const wchar_t * ucs1, const __le16 * ucs2,
  				size_t n)
  {
  	if (!n)
  		return 0;	/* Null strings are equal */
  	while ((*ucs1 == __le16_to_cpu(*ucs2)) && *ucs1 && --n) {
  		ucs1++;
  		ucs2++;
  	}
  	return (int) *ucs1 - (int) __le16_to_cpu(*ucs2);
  }
  
  /*
   * UniStrncpy_to_le:  Copy length limited string with pad to little-endian
   */
  static inline __le16 *UniStrncpy_to_le(__le16 * ucs1, const wchar_t * ucs2,
  				       size_t n)
  {
  	__le16 *anchor = ucs1;
  
  	while (n-- && *ucs2)	/* Copy the strings */
  		*ucs1++ = cpu_to_le16(*ucs2++);
  
  	n++;
  	while (n--)		/* Pad with nulls */
  		*ucs1++ = 0;
  	return anchor;
  }
  
  /*
   * UniStrncpy_from_le:  Copy length limited string with pad from little-endian
   */
  static inline wchar_t *UniStrncpy_from_le(wchar_t * ucs1, const __le16 * ucs2,
  					  size_t n)
  {
  	wchar_t *anchor = ucs1;
  
  	while (n-- && *ucs2)	/* Copy the strings */
  		*ucs1++ = __le16_to_cpu(*ucs2++);
  
  	n++;
  	while (n--)		/* Pad with nulls */
  		*ucs1++ = 0;
  	return anchor;
  }
  
  /*
   * UniToupper:  Convert a unicode character to upper case
   */
  static inline wchar_t UniToupper(wchar_t uc)
  {
  	UNICASERANGE *rp;
  
  	if (uc < sizeof(UniUpperTable)) {	/* Latin characters */
  		return uc + UniUpperTable[uc];	/* Use base tables */
  	} else {
  		rp = UniUpperRange;	/* Use range tables */
  		while (rp->start) {
  			if (uc < rp->start)	/* Before start of range */
  				return uc;	/* Uppercase = input */
  			if (uc <= rp->end)	/* In range */
  				return uc + rp->table[uc - rp->start];
  			rp++;	/* Try next range */
  		}
  	}
  	return uc;		/* Past last range */
  }
  
  
  /*
   * UniStrupr:  Upper case a unicode string
   */
  static inline wchar_t *UniStrupr(wchar_t * upin)
  {
  	wchar_t *up;
  
  	up = upin;
  	while (*up) {		/* For all characters */
  		*up = UniToupper(*up);
  		up++;
  	}
  	return upin;		/* Return input pointer */
  }
  
  #endif				/* !_H_JFS_UNICODE */