LXR linux/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 */
  16static int
  17uni16_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
  40int
  41get_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}
  70