// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/isofs/joliet.c
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*
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* (C) 1996 Gordon Chaffee
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*
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* Joliet: Microsoft's Unicode extensions to iso9660
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*/
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#include <linux/types.h>
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#include <linux/nls.h>
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#include "isofs.h"
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/*
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* Convert Unicode 16 to UTF-8 or ASCII.
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*/
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static int
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uni16_to_x8(unsigned char *ascii, __be16 *uni, int len, struct nls_table *nls)
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{
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__be16 *ip, ch;
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unsigned char *op;
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ip = uni;
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op = ascii;
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while ((ch = get_unaligned(ip)) && len) {
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int llen;
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llen = nls->uni2char(be16_to_cpu(ch), op, NLS_MAX_CHARSET_SIZE);
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if (llen > 0)
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op += llen;
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else
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*op++ = '?';
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ip++;
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len--;
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}
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*op = 0;
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return (op - ascii);
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}
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int
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get_joliet_filename(struct iso_directory_record * de, unsigned char *outname, struct inode * inode)
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{
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struct nls_table *nls;
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unsigned char len = 0;
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nls = ISOFS_SB(inode->i_sb)->s_nls_iocharset;
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if (!nls) {
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len = utf16s_to_utf8s((const wchar_t *) de->name,
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de->name_len[0] >> 1, UTF16_BIG_ENDIAN,
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outname, PAGE_SIZE);
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} else {
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len = uni16_to_x8(outname, (__be16 *) de->name,
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de->name_len[0] >> 1, nls);
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}
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if ((len > 2) && (outname[len-2] == ';') && (outname[len-1] == '1'))
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len -= 2;
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/*
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* Windows doesn't like periods at the end of a name,
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* so neither do we
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*/
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while (len >= 2 && (outname[len-1] == '.'))
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len--;
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return len;
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}
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