blob: 46835240275c9829aeb26773df610edccf282d52 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * unicode.c
3 *
4 * PURPOSE
5 * Routines for converting between UTF-8 and OSTA Compressed Unicode.
6 * Also handles filename mangling
7 *
8 * DESCRIPTION
9 * OSTA Compressed Unicode is explained in the OSTA UDF specification.
10 * http://www.osta.org/
11 * UTF-8 is explained in the IETF RFC XXXX.
12 * ftp://ftp.internic.net/rfc/rfcxxxx.txt
13 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * COPYRIGHT
15 * This file is distributed under the terms of the GNU General Public
16 * License (GPL). Copies of the GPL can be obtained from:
17 * ftp://prep.ai.mit.edu/pub/gnu/GPL
18 * Each contributing author retains all rights to their own work.
19 */
20
21#include "udfdecl.h"
22
23#include <linux/kernel.h>
24#include <linux/string.h> /* for memset */
25#include <linux/nls.h>
26#include <linux/udf_fs.h>
27
28#include "udf_sb.h"
29
30static int udf_translate_to_linux(uint8_t *, uint8_t *, int, uint8_t *, int);
31
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070032static int udf_char_to_ustr(struct ustr *dest, const uint8_t * src, int strlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -070033{
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070034 if ((!dest) || (!src) || (!strlen) || (strlen > UDF_NAME_LEN - 2))
Linus Torvalds1da177e2005-04-16 15:20:36 -070035 return 0;
36 memset(dest, 0, sizeof(struct ustr));
37 memcpy(dest->u_name, src, strlen);
38 dest->u_cmpID = 0x08;
39 dest->u_len = strlen;
40 return strlen;
41}
42
43/*
44 * udf_build_ustr
45 */
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070046int udf_build_ustr(struct ustr *dest, dstring * ptr, int size)
Linus Torvalds1da177e2005-04-16 15:20:36 -070047{
48 int usesize;
49
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070050 if ((!dest) || (!ptr) || (!size))
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 return -1;
52
53 memset(dest, 0, sizeof(struct ustr));
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070054 usesize = (size > UDF_NAME_LEN) ? UDF_NAME_LEN : size;
55 dest->u_cmpID = ptr[0];
56 dest->u_len = ptr[size - 1];
57 memcpy(dest->u_name, ptr + 1, usesize - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 return 0;
59}
60
61/*
62 * udf_build_ustr_exact
63 */
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070064static int udf_build_ustr_exact(struct ustr *dest, dstring * ptr, int exactsize)
Linus Torvalds1da177e2005-04-16 15:20:36 -070065{
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070066 if ((!dest) || (!ptr) || (!exactsize))
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 return -1;
68
69 memset(dest, 0, sizeof(struct ustr));
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070070 dest->u_cmpID = ptr[0];
71 dest->u_len = exactsize - 1;
72 memcpy(dest->u_name, ptr + 1, exactsize - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 return 0;
74}
75
76/*
77 * udf_ocu_to_utf8
78 *
79 * PURPOSE
80 * Convert OSTA Compressed Unicode to the UTF-8 equivalent.
81 *
82 * DESCRIPTION
83 * This routine is only called by udf_filldir().
84 *
85 * PRE-CONDITIONS
86 * utf Pointer to UTF-8 output buffer.
87 * ocu Pointer to OSTA Compressed Unicode input buffer
88 * of size UDF_NAME_LEN bytes.
89 * both of type "struct ustr *"
90 *
91 * POST-CONDITIONS
92 * <return> Zero on success.
93 *
94 * HISTORY
95 * November 12, 1997 - Andrew E. Mileski
96 * Written, tested, and released.
97 */
98int udf_CS0toUTF8(struct ustr *utf_o, struct ustr *ocu_i)
99{
100 uint8_t *ocu;
101 uint32_t c;
102 uint8_t cmp_id, ocu_len;
103 int i;
104
105 ocu = ocu_i->u_name;
106
107 ocu_len = ocu_i->u_len;
108 cmp_id = ocu_i->u_cmpID;
109 utf_o->u_len = 0;
110
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700111 if (ocu_len == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 memset(utf_o, 0, sizeof(struct ustr));
113 utf_o->u_cmpID = 0;
114 utf_o->u_len = 0;
115 return 0;
116 }
117
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700118 if ((cmp_id != 8) && (cmp_id != 16)) {
119 printk(KERN_ERR "udf: unknown compression code (%d) stri=%s\n",
120 cmp_id, ocu_i->u_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 return 0;
122 }
123
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700124 for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN - 3));) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126 /* Expand OSTA compressed Unicode to Unicode */
127 c = ocu[i++];
128 if (cmp_id == 16)
129 c = (c << 8) | ocu[i++];
130
131 /* Compress Unicode to UTF-8 */
132 if (c < 0x80U)
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700133 utf_o->u_name[utf_o->u_len++] = (uint8_t) c;
134 else if (c < 0x800U) {
135 utf_o->u_name[utf_o->u_len++] =
136 (uint8_t) (0xc0 | (c >> 6));
137 utf_o->u_name[utf_o->u_len++] =
138 (uint8_t) (0x80 | (c & 0x3f));
139 } else {
140 utf_o->u_name[utf_o->u_len++] =
141 (uint8_t) (0xe0 | (c >> 12));
142 utf_o->u_name[utf_o->u_len++] =
143 (uint8_t) (0x80 | ((c >> 6) & 0x3f));
144 utf_o->u_name[utf_o->u_len++] =
145 (uint8_t) (0x80 | (c & 0x3f));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 }
147 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700148 utf_o->u_cmpID = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
150 return utf_o->u_len;
151}
152
153/*
154 *
155 * udf_utf8_to_ocu
156 *
157 * PURPOSE
158 * Convert UTF-8 to the OSTA Compressed Unicode equivalent.
159 *
160 * DESCRIPTION
161 * This routine is only called by udf_lookup().
162 *
163 * PRE-CONDITIONS
164 * ocu Pointer to OSTA Compressed Unicode output
165 * buffer of size UDF_NAME_LEN bytes.
166 * utf Pointer to UTF-8 input buffer.
167 * utf_len Length of UTF-8 input buffer in bytes.
168 *
169 * POST-CONDITIONS
170 * <return> Zero on success.
171 *
172 * HISTORY
173 * November 12, 1997 - Andrew E. Mileski
174 * Written, tested, and released.
175 */
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700176static int udf_UTF8toCS0(dstring * ocu, struct ustr *utf, int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177{
178 unsigned c, i, max_val, utf_char;
179 int utf_cnt, u_len;
180
181 memset(ocu, 0, sizeof(dstring) * length);
182 ocu[0] = 8;
183 max_val = 0xffU;
184
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700185 try_again:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 u_len = 0U;
187 utf_char = 0U;
188 utf_cnt = 0U;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700189 for (i = 0U; i < utf->u_len; i++) {
190 c = (uint8_t) utf->u_name[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
192 /* Complete a multi-byte UTF-8 character */
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700193 if (utf_cnt) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 utf_char = (utf_char << 6) | (c & 0x3fU);
195 if (--utf_cnt)
196 continue;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700197 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 /* Check for a multi-byte UTF-8 character */
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700199 if (c & 0x80U) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 /* Start a multi-byte UTF-8 character */
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700201 if ((c & 0xe0U) == 0xc0U) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 utf_char = c & 0x1fU;
203 utf_cnt = 1;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700204 } else if ((c & 0xf0U) == 0xe0U) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 utf_char = c & 0x0fU;
206 utf_cnt = 2;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700207 } else if ((c & 0xf8U) == 0xf0U) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 utf_char = c & 0x07U;
209 utf_cnt = 3;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700210 } else if ((c & 0xfcU) == 0xf8U) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 utf_char = c & 0x03U;
212 utf_cnt = 4;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700213 } else if ((c & 0xfeU) == 0xfcU) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 utf_char = c & 0x01U;
215 utf_cnt = 5;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700216 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 goto error_out;
218 continue;
219 } else
220 /* Single byte UTF-8 character (most common) */
221 utf_char = c;
222 }
223
224 /* Choose no compression if necessary */
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700225 if (utf_char > max_val) {
226 if (0xffU == max_val) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 max_val = 0xffffU;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700228 ocu[0] = (uint8_t) 0x10U;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 goto try_again;
230 }
231 goto error_out;
232 }
233
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700234 if (max_val == 0xffffU) {
235 ocu[++u_len] = (uint8_t) (utf_char >> 8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700237 ocu[++u_len] = (uint8_t) (utf_char & 0xffU);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 }
239
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700240 if (utf_cnt) {
241 error_out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 ocu[++u_len] = '?';
243 printk(KERN_DEBUG "udf: bad UTF-8 character\n");
244 }
245
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700246 ocu[length - 1] = (uint8_t) u_len + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 return u_len + 1;
248}
249
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700250static int udf_CS0toNLS(struct nls_table *nls, struct ustr *utf_o,
251 struct ustr *ocu_i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252{
253 uint8_t *ocu;
254 uint32_t c;
255 uint8_t cmp_id, ocu_len;
256 int i;
257
258 ocu = ocu_i->u_name;
259
260 ocu_len = ocu_i->u_len;
261 cmp_id = ocu_i->u_cmpID;
262 utf_o->u_len = 0;
263
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700264 if (ocu_len == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 memset(utf_o, 0, sizeof(struct ustr));
266 utf_o->u_cmpID = 0;
267 utf_o->u_len = 0;
268 return 0;
269 }
270
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700271 if ((cmp_id != 8) && (cmp_id != 16)) {
272 printk(KERN_ERR "udf: unknown compression code (%d) stri=%s\n",
273 cmp_id, ocu_i->u_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 return 0;
275 }
276
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700277 for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN - 3));) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 /* Expand OSTA compressed Unicode to Unicode */
279 c = ocu[i++];
280 if (cmp_id == 16)
281 c = (c << 8) | ocu[i++];
282
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700283 utf_o->u_len += nls->uni2char(c, &utf_o->u_name[utf_o->u_len],
284 UDF_NAME_LEN - utf_o->u_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700286 utf_o->u_cmpID = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
288 return utf_o->u_len;
289}
290
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700291static int udf_NLStoCS0(struct nls_table *nls, dstring * ocu, struct ustr *uni,
292 int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293{
294 unsigned len, i, max_val;
295 uint16_t uni_char;
296 int u_len;
297
298 memset(ocu, 0, sizeof(dstring) * length);
299 ocu[0] = 8;
300 max_val = 0xffU;
301
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700302 try_again:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 u_len = 0U;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700304 for (i = 0U; i < uni->u_len; i++) {
305 len = nls->char2uni(&uni->u_name[i], uni->u_len - i, &uni_char);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 if (len <= 0)
307 continue;
308
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700309 if (uni_char > max_val) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 max_val = 0xffffU;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700311 ocu[0] = (uint8_t) 0x10U;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 goto try_again;
313 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700314
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 if (max_val == 0xffffU)
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700316 ocu[++u_len] = (uint8_t) (uni_char >> 8);
317 ocu[++u_len] = (uint8_t) (uni_char & 0xffU);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 i += len - 1;
319 }
320
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700321 ocu[length - 1] = (uint8_t) u_len + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 return u_len + 1;
323}
324
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700325int udf_get_filename(struct super_block *sb, uint8_t * sname, uint8_t * dname,
326 int flen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327{
328 struct ustr filename, unifilename;
329 int len;
330
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700331 if (udf_build_ustr_exact(&unifilename, sname, flen)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 return 0;
333 }
334
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700335 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) {
336 if (!udf_CS0toUTF8(&filename, &unifilename)) {
337 udf_debug("Failed in udf_get_filename: sname = %s\n",
338 sname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 return 0;
340 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700341 } else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) {
342 if (!udf_CS0toNLS
343 (UDF_SB(sb)->s_nls_map, &filename, &unifilename)) {
344 udf_debug("Failed in udf_get_filename: sname = %s\n",
345 sname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 return 0;
347 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700348 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 return 0;
350
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700351 if ((len =
352 udf_translate_to_linux(dname, filename.u_name, filename.u_len,
353 unifilename.u_name, unifilename.u_len))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 return len;
355 }
356 return 0;
357}
358
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700359int udf_put_filename(struct super_block *sb, const uint8_t * sname,
360 uint8_t * dname, int flen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361{
362 struct ustr unifilename;
363 int namelen;
364
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700365 if (!(udf_char_to_ustr(&unifilename, sname, flen))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 return 0;
367 }
368
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700369 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) {
370 if (!
371 (namelen =
372 udf_UTF8toCS0(dname, &unifilename, UDF_NAME_LEN))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 return 0;
374 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700375 } else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) {
376 if (!
377 (namelen =
378 udf_NLStoCS0(UDF_SB(sb)->s_nls_map, dname, &unifilename,
379 UDF_NAME_LEN))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 return 0;
381 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700382 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 return 0;
384
385 return namelen;
386}
387
388#define ILLEGAL_CHAR_MARK '_'
389#define EXT_MARK '.'
390#define CRC_MARK '#'
391#define EXT_SIZE 5
392
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700393static int udf_translate_to_linux(uint8_t * newName, uint8_t * udfName,
394 int udfLen, uint8_t * fidName, int fidNameLen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395{
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700396 int index, newIndex = 0, needsCRC = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 int extIndex = 0, newExtIndex = 0, hasExt = 0;
398 unsigned short valueCRC;
399 uint8_t curr;
400 const uint8_t hexChar[] = "0123456789ABCDEF";
401
402 if (udfName[0] == '.' && (udfLen == 1 ||
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700403 (udfLen == 2 && udfName[1] == '.'))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 needsCRC = 1;
405 newIndex = udfLen;
406 memcpy(newName, udfName, udfLen);
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700407 } else {
408 for (index = 0; index < udfLen; index++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 curr = udfName[index];
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700410 if (curr == '/' || curr == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 needsCRC = 1;
412 curr = ILLEGAL_CHAR_MARK;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700413 while (index + 1 < udfLen
414 && (udfName[index + 1] == '/'
415 || udfName[index + 1] == 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 index++;
417 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700418 if (curr == EXT_MARK
419 && (udfLen - index - 1) <= EXT_SIZE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 if (udfLen == index + 1)
421 hasExt = 0;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700422 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 hasExt = 1;
424 extIndex = index;
425 newExtIndex = newIndex;
426 }
427 }
428 if (newIndex < 256)
429 newName[newIndex++] = curr;
430 else
431 needsCRC = 1;
432 }
433 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700434 if (needsCRC) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 uint8_t ext[EXT_SIZE];
436 int localExtIndex = 0;
437
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700438 if (hasExt) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 int maxFilenameLen;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700440 for (index = 0;
441 index < EXT_SIZE && extIndex + index + 1 < udfLen;
442 index++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 curr = udfName[extIndex + index + 1];
444
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700445 if (curr == '/' || curr == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 needsCRC = 1;
447 curr = ILLEGAL_CHAR_MARK;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700448 while (extIndex + index + 2 < udfLen
449 && (index + 1 < EXT_SIZE
450 &&
451 (udfName
452 [extIndex + index + 2] ==
453 '/'
454 || udfName[extIndex +
455 index + 2] ==
456 0)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 index++;
458 }
459 ext[localExtIndex++] = curr;
460 }
461 maxFilenameLen = 250 - localExtIndex;
462 if (newIndex > maxFilenameLen)
463 newIndex = maxFilenameLen;
464 else
465 newIndex = newExtIndex;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700466 } else if (newIndex > 250)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 newIndex = 250;
468 newName[newIndex++] = CRC_MARK;
469 valueCRC = udf_crc(fidName, fidNameLen, 0);
470 newName[newIndex++] = hexChar[(valueCRC & 0xf000) >> 12];
471 newName[newIndex++] = hexChar[(valueCRC & 0x0f00) >> 8];
472 newName[newIndex++] = hexChar[(valueCRC & 0x00f0) >> 4];
473 newName[newIndex++] = hexChar[(valueCRC & 0x000f)];
474
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700475 if (hasExt) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 newName[newIndex++] = EXT_MARK;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700477 for (index = 0; index < localExtIndex; index++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 newName[newIndex++] = ext[index];
479 }
480 }
481 return newIndex;
482}