1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * unistr.c - NTFS Unicode string handling. Part of the Linux-NTFS project.
5  * Copyright (c) 2001-2006 Anton Altaparmakov
41  * ntfs_are_names_equal - compare two Unicode names for equality
66  * ntfs_collate_names - collate two Unicode names
76  *  -1 if the first name collates before the second one,
106 			return -1;  in ntfs_collate_names()
111 		return -1;  in ntfs_collate_names()
122  * ntfs_ucsncmp - compare two little endian Unicode strings
129  * conversion is performed on non-little endian machines.
144 			return -1;  in ntfs_ucsncmp()
154  * ntfs_ucsncasecmp - compare two little endian Unicode strings, ignoring case
163  * le16_to_cpu() conversion is performed on non-little endian machines.
183 			return -1;  in ntfs_ucsncasecmp()
206 	ntfs_upcase_name((ntfschar*)&file_name_attr->file_name,  in ntfs_file_upcase_value()
207 			file_name_attr->file_name_length, upcase, upcase_len);  in ntfs_file_upcase_value()
215 	return ntfs_collate_names((ntfschar*)&file_name_attr1->file_name,  in ntfs_file_compare_values()
216 			file_name_attr1->file_name_length,  in ntfs_file_compare_values()
217 			(ntfschar*)&file_name_attr2->file_name,  in ntfs_file_compare_values()
218 			file_name_attr2->file_name_length,  in ntfs_file_compare_values()
223  * ntfs_nlstoucs - convert NLS string to little endian Unicode string
230  * map dictates, into a little endian, 2-byte Unicode string.
248 	struct nls_table *nls = vol->nls_map;  in ntfs_nlstoucs()
250 	wchar_t wc;  in ntfs_nlstoucs()  local
258 				wc_len = nls->char2uni(ins + i, ins_len - i,  in ntfs_nlstoucs()
259 						&wc);  in ntfs_nlstoucs()
262 					if (likely(wc)) {  in ntfs_nlstoucs()
263 						ucs[o++] = cpu_to_le16(wc);  in ntfs_nlstoucs()
265 					} /* else if (!wc) */  in ntfs_nlstoucs()
275 		ntfs_error(vol->sb, "Failed to allocate buffer for converted "  in ntfs_nlstoucs()
277 		return -ENOMEM;  in ntfs_nlstoucs()
279 	ntfs_error(vol->sb, "Received NULL pointer.");  in ntfs_nlstoucs()
280 	return -EINVAL;  in ntfs_nlstoucs()
284 		ntfs_error(vol->sb, "Name using character set %s contains "  in ntfs_nlstoucs()
286 				"Unicode.", nls->charset);  in ntfs_nlstoucs()
287 		i = -EILSEQ;  in ntfs_nlstoucs()
289 		ntfs_error(vol->sb, "Name is too long (maximum length for a "  in ntfs_nlstoucs()
292 		i = -ENAMETOOLONG;  in ntfs_nlstoucs()
298  * ntfs_ucstonls - convert little endian Unicode string to NLS string
305  * Convert the input little endian, 2-byte Unicode string @ins, of length
325 	struct nls_table *nls = vol->nls_map;  in ntfs_ucstonls()
327 	int i, o, ns_len, wc;  in ntfs_ucstonls()  local
334 			wc = -ENAMETOOLONG;  in ntfs_ucstonls()
344 retry:			wc = nls->uni2char(le16_to_cpu(ins[i]), ns + o,  in ntfs_ucstonls()
345 					ns_len - o);  in ntfs_ucstonls()
346 			if (wc > 0) {  in ntfs_ucstonls()
347 				o += wc;  in ntfs_ucstonls()
349 			} else if (!wc)  in ntfs_ucstonls()
351 			else if (wc == -ENAMETOOLONG && ns != *outs) {  in ntfs_ucstonls()
358 					ns_len = ((ns_len + 64) & ~63) - 1;  in ntfs_ucstonls()
362 				} /* No memory so goto conversion_error; */  in ntfs_ucstonls()
363 			} /* wc < 0, real error. */  in ntfs_ucstonls()
370 	ntfs_error(vol->sb, "Received NULL pointer.");  in ntfs_ucstonls()
371 	return -EINVAL;  in ntfs_ucstonls()
373 	ntfs_error(vol->sb, "Unicode name contains characters that cannot be "  in ntfs_ucstonls()
375 			"try to use the mount option nls=utf8.", nls->charset);  in ntfs_ucstonls()
378 	if (wc != -ENAMETOOLONG)  in ntfs_ucstonls()
379 		wc = -EILSEQ;  in ntfs_ucstonls()
380 	return wc;  in ntfs_ucstonls()
382 	ntfs_error(vol->sb, "Failed to allocate name!");  in ntfs_ucstonls()
383 	return -ENOMEM;  in ntfs_ucstonls()