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/*

 *  linux/fs/isofs/joliet.c

 *

 *  (C) 1996 Gordon Chaffee

 *

 *  Joliet: Microsoft's Unicode extensions to iso9660

 */

#include <linux/string.h>

#include <linux/nls.h>

#include <linux/slab.h>

#include <linux/iso_fs.h>

#include <asm/unaligned.h>

/*

 * Convert Unicode 16 to UTF8 or ASCII.

 */

static int

uni16_to_x8(unsigned char *ascii, u16 *uni, int len, struct nls_table *nls)

{

        wchar_t *ip, ch;

        unsigned char *op;

        ip = uni;

        op = ascii;

        while ((ch = get_unaligned(ip)) && len) {

                int llen;

                ch = be16_to_cpu(ch);

                if ((llen = nls->uni2char(ch, op, NLS_MAX_CHARSET_SIZE)) > 0)

                        op += llen;

                else

                        *op++ = '?';

                ip++;

                len--;

        }

        *op = 0;

        return (op - ascii);

}

/* Convert big endian wide character string to utf8 */

static int

wcsntombs_be(__u8 *s, const __u8 *pwcs, int inlen, int maxlen)

{

        const __u8 *ip;

        __u8 *op;

        int size;

        __u16 c;

        op = s;

        ip = pwcs;

        while ((*ip || ip[1]) && (maxlen > 0) && (inlen > 0)) {

                c = (*ip << 8) | ip[1];

                if (c > 0x7f) {

                        size = utf8_wctomb(op, c, maxlen);

                        if (size == -1) {

                                /* Ignore character and move on */

                                maxlen--;

                        } else {

                                op += size;

                                maxlen -= size;

                        }

                } else {

                        *op++ = (__u8) c;

                }

                ip += 2;

                inlen--;

        }

        return (op - s);

}

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 = inode->i_sb->u.isofs_sb.s_utf8;

        nls = inode->i_sb->u.isofs_sb.s_nls_iocharset;

        if (utf8) {

                len = wcsntombs_be(outname, de->name,

                                   de->name_len[0] >> 1, PAGE_SIZE);

        } else {

                len = uni16_to_x8(outname, (u16 *) 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;

}