cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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joliet.c (1333B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 *  linux/fs/isofs/joliet.c
      4 *
      5 *  (C) 1996 Gordon Chaffee
      6 *
      7 *  Joliet: Microsoft's Unicode extensions to iso9660
      8 */
      9
     10#include <linux/types.h>
     11#include <linux/nls.h>
     12#include "isofs.h"
     13
     14/*
     15 * Convert Unicode 16 to UTF-8 or ASCII.
     16 */
     17static int
     18uni16_to_x8(unsigned char *ascii, __be16 *uni, int len, struct nls_table *nls)
     19{
     20	__be16 *ip, ch;
     21	unsigned char *op;
     22
     23	ip = uni;
     24	op = ascii;
     25
     26	while ((ch = get_unaligned(ip)) && len) {
     27		int llen;
     28		llen = nls->uni2char(be16_to_cpu(ch), op, NLS_MAX_CHARSET_SIZE);
     29		if (llen > 0)
     30			op += llen;
     31		else
     32			*op++ = '?';
     33		ip++;
     34
     35		len--;
     36	}
     37	*op = 0;
     38	return (op - ascii);
     39}
     40
     41int
     42get_joliet_filename(struct iso_directory_record * de, unsigned char *outname, struct inode * inode)
     43{
     44	struct nls_table *nls;
     45	unsigned char len = 0;
     46
     47	nls = ISOFS_SB(inode->i_sb)->s_nls_iocharset;
     48
     49	if (!nls) {
     50		len = utf16s_to_utf8s((const wchar_t *) de->name,
     51				de->name_len[0] >> 1, UTF16_BIG_ENDIAN,
     52				outname, PAGE_SIZE);
     53	} else {
     54		len = uni16_to_x8(outname, (__be16 *) de->name,
     55				de->name_len[0] >> 1, nls);
     56	}
     57	if ((len > 2) && (outname[len-2] == ';') && (outname[len-1] == '1'))
     58		len -= 2;
     59
     60	/*
     61	 * Windows doesn't like periods at the end of a name,
     62	 * so neither do we
     63	 */
     64	while (len >= 2 && (outname[len-1] == '.'))
     65		len--;
     66
     67	return len;
     68}