joliet.c

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/*
 *  linux/fs/isofs/joliet.c
 *
 *  (C) 1996 Gordon Chaffee
 *
 *  Joliet: Microsoft's Unicode extensions to iso9660
 */

#include <linux/types.h>
#include <linux/nls.h>
#include "isofs.h"

/*
 * Convert Unicode 16 to UTF-8 or ASCII.
 */
static int
uni16_to_x8(unsigned char *ascii, __be16 *uni, int len, struct nls_table *nls)
{
    __be16 *ip, ch;
    unsigned char *op;

    ip = uni;
    op = ascii;

    while ((ch = get_unaligned(ip)) && len) {
        int llen;
        llen = nls->uni2char(be16_to_cpu(ch), op, NLS_MAX_CHARSET_SIZE);
        if (llen > 0)
            op += llen;
        else
            *op++ = '?';
        ip++;

        len--;
    }
    *op = 0;
    return (op - ascii);
}

int
get_joliet_filename(struct iso_directory_record * de, unsigned char *outname, struct inode * inode)
{
    unsigned char utf8;
    struct nls_table *nls;
    unsigned char len = 0;

    utf8 = ISOFS_SB(inode->i_sb)->s_utf8;
    nls = ISOFS_SB(inode->i_sb)->s_nls_iocharset;

    if (utf8) {
        len = utf16s_to_utf8s((const wchar_t *) de->name,
                de->name_len[0] >> 1, UTF16_BIG_ENDIAN,
                outname, PAGE_SIZE);
    } else {
        len = uni16_to_x8(outname, (__be16 *) de->name,
                de->name_len[0] >> 1, nls);
    }
    if ((len > 2) && (outname[len-2] == ';') && (outname[len-1] == '1'))
        len -= 2;

    /*
     * Windows doesn't like periods at the end of a name,
     * so neither do we
     */
    while (len >= 2 && (outname[len-1] == '.'))
        len--;

    return len;
}