fs/isofs/joliet.c

   1 /*
   2  *  linux/fs/isofs/joliet.c
   3  *
   4  *  (C) 1996 Gordon Chaffee
   5  *
   6  *  Joliet: Microsoft's Unicode extensions to iso9660
   7  */
   8
   9 #include <linux/types.h>
  10 #include <linux/nls.h>
  11 #include "isofs.h"
  12
  13 /*
  14  * Convert Unicode 16 to UTF-8 or ASCII.
  15  */
  16 static int
  17 uni16_to_x8(unsigned char *ascii, __be16 *uni, int len, struct nls_table *nls)
  18 {
  19         __be16 *ip, ch;
  20         unsigned char *op;
  21
  22         ip = uni;
  23         op = ascii;
  24
  25         while ((ch = get_unaligned(ip)) && len) {
  26                 int llen;
  27                 llen = nls->uni2char(be16_to_cpu(ch), op, NLS_MAX_CHARSET_SIZE);
  28                 if (llen > 0)
  29                         op += llen;
  30                 else
  31                         *op++ = '?';
  32                 ip++;
  33
  34                 len--;
  35         }
  36         *op = 0;
  37         return (op - ascii);
  38 }
  39
  40 int
  41 get_joliet_filename(struct iso_directory_record * de, unsigned char *outname, struct inode * inode)
  42 {
  43         unsigned char utf8;
  44         struct nls_table *nls;
  45         unsigned char len = 0;
  46
  47         utf8 = ISOFS_SB(inode->i_sb)->s_utf8;
  48         nls = ISOFS_SB(inode->i_sb)->s_nls_iocharset;
  49
  50         if (utf8) {
  51                 len = utf16s_to_utf8s((const wchar_t *) de->name,
  52                                 de->name_len[0] >> 1, UTF16_BIG_ENDIAN,
  53                                 outname, PAGE_SIZE);
  54         } else {
  55                 len = uni16_to_x8(outname, (__be16 *) de->name,
  56                                 de->name_len[0] >> 1, nls);
  57         }
  58         if ((len > 2) && (outname[len-2] == ';') && (outname[len-1] == '1'))
  59                 len -= 2;
  60
  61         /*
  62          * Windows doesn't like periods at the end of a name,
  63          * so neither do we
  64          */
  65         while (len >= 2 && (outname[len-1] == '.'))
  66                 len--;
  67
  68         return len;
  69 }