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} 69