515 lines
12 KiB
C
515 lines
12 KiB
C
/*
|
|
* unicode.c
|
|
*
|
|
* PURPOSE
|
|
* Routines for converting between UTF-8 and OSTA Compressed Unicode.
|
|
* Also handles filename mangling
|
|
*
|
|
* DESCRIPTION
|
|
* OSTA Compressed Unicode is explained in the OSTA UDF specification.
|
|
* http://www.osta.org/
|
|
* UTF-8 is explained in the IETF RFC XXXX.
|
|
* ftp://ftp.internic.net/rfc/rfcxxxx.txt
|
|
*
|
|
* COPYRIGHT
|
|
* This file is distributed under the terms of the GNU General Public
|
|
* License (GPL). Copies of the GPL can be obtained from:
|
|
* ftp://prep.ai.mit.edu/pub/gnu/GPL
|
|
* Each contributing author retains all rights to their own work.
|
|
*/
|
|
|
|
#include "udfdecl.h"
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h> /* for memset */
|
|
#include <linux/nls.h>
|
|
#include <linux/crc-itu-t.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include "udf_sb.h"
|
|
|
|
static int udf_translate_to_linux(uint8_t *, int, uint8_t *, int, uint8_t *,
|
|
int);
|
|
|
|
static int udf_char_to_ustr(struct ustr *dest, const uint8_t *src, int strlen)
|
|
{
|
|
if ((!dest) || (!src) || (!strlen) || (strlen > UDF_NAME_LEN - 2))
|
|
return 0;
|
|
|
|
memset(dest, 0, sizeof(struct ustr));
|
|
memcpy(dest->u_name, src, strlen);
|
|
dest->u_cmpID = 0x08;
|
|
dest->u_len = strlen;
|
|
|
|
return strlen;
|
|
}
|
|
|
|
/*
|
|
* udf_build_ustr
|
|
*/
|
|
int udf_build_ustr(struct ustr *dest, dstring *ptr, int size)
|
|
{
|
|
int usesize;
|
|
|
|
if (!dest || !ptr || !size)
|
|
return -1;
|
|
BUG_ON(size < 2);
|
|
|
|
usesize = min_t(size_t, ptr[size - 1], sizeof(dest->u_name));
|
|
usesize = min(usesize, size - 2);
|
|
dest->u_cmpID = ptr[0];
|
|
dest->u_len = usesize;
|
|
memcpy(dest->u_name, ptr + 1, usesize);
|
|
memset(dest->u_name + usesize, 0, sizeof(dest->u_name) - usesize);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* udf_build_ustr_exact
|
|
*/
|
|
static void udf_build_ustr_exact(struct ustr *dest, dstring *ptr, int exactsize)
|
|
{
|
|
memset(dest, 0, sizeof(struct ustr));
|
|
dest->u_cmpID = ptr[0];
|
|
dest->u_len = exactsize - 1;
|
|
memcpy(dest->u_name, ptr + 1, exactsize - 1);
|
|
}
|
|
|
|
/*
|
|
* udf_CS0toUTF8
|
|
*
|
|
* PURPOSE
|
|
* Convert OSTA Compressed Unicode to the UTF-8 equivalent.
|
|
*
|
|
* PRE-CONDITIONS
|
|
* utf Pointer to UTF-8 output buffer.
|
|
* ocu Pointer to OSTA Compressed Unicode input buffer
|
|
* of size UDF_NAME_LEN bytes.
|
|
* both of type "struct ustr *"
|
|
*
|
|
* POST-CONDITIONS
|
|
* <return> >= 0 on success.
|
|
*
|
|
* HISTORY
|
|
* November 12, 1997 - Andrew E. Mileski
|
|
* Written, tested, and released.
|
|
*/
|
|
int udf_CS0toUTF8(struct ustr *utf_o, const struct ustr *ocu_i)
|
|
{
|
|
const uint8_t *ocu;
|
|
uint8_t cmp_id, ocu_len;
|
|
int i;
|
|
|
|
ocu_len = ocu_i->u_len;
|
|
if (ocu_len == 0) {
|
|
memset(utf_o, 0, sizeof(struct ustr));
|
|
return 0;
|
|
}
|
|
|
|
cmp_id = ocu_i->u_cmpID;
|
|
if (cmp_id != 8 && cmp_id != 16) {
|
|
memset(utf_o, 0, sizeof(struct ustr));
|
|
pr_err("unknown compression code (%d) stri=%s\n",
|
|
cmp_id, ocu_i->u_name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ocu = ocu_i->u_name;
|
|
utf_o->u_len = 0;
|
|
for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN - 3));) {
|
|
|
|
/* Expand OSTA compressed Unicode to Unicode */
|
|
uint32_t c = ocu[i++];
|
|
if (cmp_id == 16)
|
|
c = (c << 8) | ocu[i++];
|
|
|
|
/* Compress Unicode to UTF-8 */
|
|
if (c < 0x80U)
|
|
utf_o->u_name[utf_o->u_len++] = (uint8_t)c;
|
|
else if (c < 0x800U) {
|
|
if (utf_o->u_len > (UDF_NAME_LEN - 4))
|
|
break;
|
|
utf_o->u_name[utf_o->u_len++] =
|
|
(uint8_t)(0xc0 | (c >> 6));
|
|
utf_o->u_name[utf_o->u_len++] =
|
|
(uint8_t)(0x80 | (c & 0x3f));
|
|
} else {
|
|
if (utf_o->u_len > (UDF_NAME_LEN - 5))
|
|
break;
|
|
utf_o->u_name[utf_o->u_len++] =
|
|
(uint8_t)(0xe0 | (c >> 12));
|
|
utf_o->u_name[utf_o->u_len++] =
|
|
(uint8_t)(0x80 |
|
|
((c >> 6) & 0x3f));
|
|
utf_o->u_name[utf_o->u_len++] =
|
|
(uint8_t)(0x80 | (c & 0x3f));
|
|
}
|
|
}
|
|
utf_o->u_cmpID = 8;
|
|
|
|
return utf_o->u_len;
|
|
}
|
|
|
|
/*
|
|
*
|
|
* udf_UTF8toCS0
|
|
*
|
|
* PURPOSE
|
|
* Convert UTF-8 to the OSTA Compressed Unicode equivalent.
|
|
*
|
|
* DESCRIPTION
|
|
* This routine is only called by udf_lookup().
|
|
*
|
|
* PRE-CONDITIONS
|
|
* ocu Pointer to OSTA Compressed Unicode output
|
|
* buffer of size UDF_NAME_LEN bytes.
|
|
* utf Pointer to UTF-8 input buffer.
|
|
* utf_len Length of UTF-8 input buffer in bytes.
|
|
*
|
|
* POST-CONDITIONS
|
|
* <return> Zero on success.
|
|
*
|
|
* HISTORY
|
|
* November 12, 1997 - Andrew E. Mileski
|
|
* Written, tested, and released.
|
|
*/
|
|
static int udf_UTF8toCS0(dstring *ocu, struct ustr *utf, int length)
|
|
{
|
|
unsigned c, i, max_val, utf_char;
|
|
int utf_cnt, u_len, u_ch;
|
|
|
|
memset(ocu, 0, sizeof(dstring) * length);
|
|
ocu[0] = 8;
|
|
max_val = 0xffU;
|
|
u_ch = 1;
|
|
|
|
try_again:
|
|
u_len = 0U;
|
|
utf_char = 0U;
|
|
utf_cnt = 0U;
|
|
for (i = 0U; i < utf->u_len; i++) {
|
|
/* Name didn't fit? */
|
|
if (u_len + 1 + u_ch >= length)
|
|
return 0;
|
|
|
|
c = (uint8_t)utf->u_name[i];
|
|
|
|
/* Complete a multi-byte UTF-8 character */
|
|
if (utf_cnt) {
|
|
utf_char = (utf_char << 6) | (c & 0x3fU);
|
|
if (--utf_cnt)
|
|
continue;
|
|
} else {
|
|
/* Check for a multi-byte UTF-8 character */
|
|
if (c & 0x80U) {
|
|
/* Start a multi-byte UTF-8 character */
|
|
if ((c & 0xe0U) == 0xc0U) {
|
|
utf_char = c & 0x1fU;
|
|
utf_cnt = 1;
|
|
} else if ((c & 0xf0U) == 0xe0U) {
|
|
utf_char = c & 0x0fU;
|
|
utf_cnt = 2;
|
|
} else if ((c & 0xf8U) == 0xf0U) {
|
|
utf_char = c & 0x07U;
|
|
utf_cnt = 3;
|
|
} else if ((c & 0xfcU) == 0xf8U) {
|
|
utf_char = c & 0x03U;
|
|
utf_cnt = 4;
|
|
} else if ((c & 0xfeU) == 0xfcU) {
|
|
utf_char = c & 0x01U;
|
|
utf_cnt = 5;
|
|
} else {
|
|
goto error_out;
|
|
}
|
|
continue;
|
|
} else {
|
|
/* Single byte UTF-8 character (most common) */
|
|
utf_char = c;
|
|
}
|
|
}
|
|
|
|
/* Choose no compression if necessary */
|
|
if (utf_char > max_val) {
|
|
if (max_val == 0xffU) {
|
|
max_val = 0xffffU;
|
|
ocu[0] = (uint8_t)0x10U;
|
|
u_ch = 2;
|
|
goto try_again;
|
|
}
|
|
goto error_out;
|
|
}
|
|
|
|
if (max_val == 0xffffU)
|
|
ocu[++u_len] = (uint8_t)(utf_char >> 8);
|
|
ocu[++u_len] = (uint8_t)(utf_char & 0xffU);
|
|
}
|
|
|
|
if (utf_cnt) {
|
|
error_out:
|
|
ocu[++u_len] = '?';
|
|
printk(KERN_DEBUG pr_fmt("bad UTF-8 character\n"));
|
|
}
|
|
|
|
ocu[length - 1] = (uint8_t)u_len + 1;
|
|
|
|
return u_len + 1;
|
|
}
|
|
|
|
static int udf_CS0toNLS(struct nls_table *nls, struct ustr *utf_o,
|
|
const struct ustr *ocu_i)
|
|
{
|
|
const uint8_t *ocu;
|
|
uint8_t cmp_id, ocu_len;
|
|
int i, len;
|
|
|
|
|
|
ocu_len = ocu_i->u_len;
|
|
if (ocu_len == 0) {
|
|
memset(utf_o, 0, sizeof(struct ustr));
|
|
return 0;
|
|
}
|
|
|
|
cmp_id = ocu_i->u_cmpID;
|
|
if (cmp_id != 8 && cmp_id != 16) {
|
|
memset(utf_o, 0, sizeof(struct ustr));
|
|
pr_err("unknown compression code (%d) stri=%s\n",
|
|
cmp_id, ocu_i->u_name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ocu = ocu_i->u_name;
|
|
utf_o->u_len = 0;
|
|
for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN - 3));) {
|
|
/* Expand OSTA compressed Unicode to Unicode */
|
|
uint32_t c = ocu[i++];
|
|
if (cmp_id == 16)
|
|
c = (c << 8) | ocu[i++];
|
|
|
|
len = nls->uni2char(c, &utf_o->u_name[utf_o->u_len],
|
|
UDF_NAME_LEN - 2 - utf_o->u_len);
|
|
/* Valid character? */
|
|
if (len >= 0)
|
|
utf_o->u_len += len;
|
|
else
|
|
utf_o->u_name[utf_o->u_len++] = '?';
|
|
}
|
|
utf_o->u_cmpID = 8;
|
|
|
|
return utf_o->u_len;
|
|
}
|
|
|
|
static int udf_NLStoCS0(struct nls_table *nls, dstring *ocu, struct ustr *uni,
|
|
int length)
|
|
{
|
|
int len;
|
|
unsigned i, max_val;
|
|
uint16_t uni_char;
|
|
int u_len, u_ch;
|
|
|
|
memset(ocu, 0, sizeof(dstring) * length);
|
|
ocu[0] = 8;
|
|
max_val = 0xffU;
|
|
u_ch = 1;
|
|
|
|
try_again:
|
|
u_len = 0U;
|
|
for (i = 0U; i < uni->u_len; i++) {
|
|
/* Name didn't fit? */
|
|
if (u_len + 1 + u_ch >= length)
|
|
return 0;
|
|
len = nls->char2uni(&uni->u_name[i], uni->u_len - i, &uni_char);
|
|
if (!len)
|
|
continue;
|
|
/* Invalid character, deal with it */
|
|
if (len < 0) {
|
|
len = 1;
|
|
uni_char = '?';
|
|
}
|
|
|
|
if (uni_char > max_val) {
|
|
max_val = 0xffffU;
|
|
ocu[0] = (uint8_t)0x10U;
|
|
u_ch = 2;
|
|
goto try_again;
|
|
}
|
|
|
|
if (max_val == 0xffffU)
|
|
ocu[++u_len] = (uint8_t)(uni_char >> 8);
|
|
ocu[++u_len] = (uint8_t)(uni_char & 0xffU);
|
|
i += len - 1;
|
|
}
|
|
|
|
ocu[length - 1] = (uint8_t)u_len + 1;
|
|
return u_len + 1;
|
|
}
|
|
|
|
int udf_get_filename(struct super_block *sb, uint8_t *sname, int slen,
|
|
uint8_t *dname, int dlen)
|
|
{
|
|
struct ustr *filename, *unifilename;
|
|
int ret;
|
|
|
|
if (!slen)
|
|
return -EIO;
|
|
|
|
filename = kmalloc(sizeof(struct ustr), GFP_NOFS);
|
|
if (!filename)
|
|
return -ENOMEM;
|
|
|
|
unifilename = kmalloc(sizeof(struct ustr), GFP_NOFS);
|
|
if (!unifilename) {
|
|
ret = -ENOMEM;
|
|
goto out1;
|
|
}
|
|
|
|
udf_build_ustr_exact(unifilename, sname, slen);
|
|
if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) {
|
|
ret = udf_CS0toUTF8(filename, unifilename);
|
|
if (ret < 0) {
|
|
udf_debug("Failed in udf_get_filename: sname = %s\n",
|
|
sname);
|
|
goto out2;
|
|
}
|
|
} else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) {
|
|
ret = udf_CS0toNLS(UDF_SB(sb)->s_nls_map, filename,
|
|
unifilename);
|
|
if (ret < 0) {
|
|
udf_debug("Failed in udf_get_filename: sname = %s\n",
|
|
sname);
|
|
goto out2;
|
|
}
|
|
} else
|
|
BUG();
|
|
|
|
ret = udf_translate_to_linux(dname, dlen,
|
|
filename->u_name, filename->u_len,
|
|
unifilename->u_name, unifilename->u_len);
|
|
/* Zero length filename isn't valid... */
|
|
if (ret == 0)
|
|
ret = -EINVAL;
|
|
out2:
|
|
kfree(unifilename);
|
|
out1:
|
|
kfree(filename);
|
|
return ret;
|
|
}
|
|
|
|
int udf_put_filename(struct super_block *sb, const uint8_t *sname,
|
|
uint8_t *dname, int flen)
|
|
{
|
|
struct ustr unifilename;
|
|
int namelen;
|
|
|
|
if (!udf_char_to_ustr(&unifilename, sname, flen))
|
|
return 0;
|
|
|
|
if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) {
|
|
namelen = udf_UTF8toCS0(dname, &unifilename, UDF_NAME_LEN);
|
|
if (!namelen)
|
|
return 0;
|
|
} else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) {
|
|
namelen = udf_NLStoCS0(UDF_SB(sb)->s_nls_map, dname,
|
|
&unifilename, UDF_NAME_LEN);
|
|
if (!namelen)
|
|
return 0;
|
|
} else
|
|
return 0;
|
|
|
|
return namelen;
|
|
}
|
|
|
|
#define ILLEGAL_CHAR_MARK '_'
|
|
#define EXT_MARK '.'
|
|
#define CRC_MARK '#'
|
|
#define EXT_SIZE 5
|
|
/* Number of chars we need to store generated CRC to make filename unique */
|
|
#define CRC_LEN 5
|
|
|
|
static int udf_translate_to_linux(uint8_t *newName, int newLen,
|
|
uint8_t *udfName, int udfLen,
|
|
uint8_t *fidName, int fidNameLen)
|
|
{
|
|
int index, newIndex = 0, needsCRC = 0;
|
|
int extIndex = 0, newExtIndex = 0, hasExt = 0;
|
|
unsigned short valueCRC;
|
|
uint8_t curr;
|
|
|
|
if (udfName[0] == '.' &&
|
|
(udfLen == 1 || (udfLen == 2 && udfName[1] == '.'))) {
|
|
needsCRC = 1;
|
|
newIndex = udfLen;
|
|
memcpy(newName, udfName, udfLen);
|
|
} else {
|
|
for (index = 0; index < udfLen; index++) {
|
|
curr = udfName[index];
|
|
if (curr == '/' || curr == 0) {
|
|
needsCRC = 1;
|
|
curr = ILLEGAL_CHAR_MARK;
|
|
while (index + 1 < udfLen &&
|
|
(udfName[index + 1] == '/' ||
|
|
udfName[index + 1] == 0))
|
|
index++;
|
|
}
|
|
if (curr == EXT_MARK &&
|
|
(udfLen - index - 1) <= EXT_SIZE) {
|
|
if (udfLen == index + 1)
|
|
hasExt = 0;
|
|
else {
|
|
hasExt = 1;
|
|
extIndex = index;
|
|
newExtIndex = newIndex;
|
|
}
|
|
}
|
|
if (newIndex < newLen)
|
|
newName[newIndex++] = curr;
|
|
else
|
|
needsCRC = 1;
|
|
}
|
|
}
|
|
if (needsCRC) {
|
|
uint8_t ext[EXT_SIZE];
|
|
int localExtIndex = 0;
|
|
|
|
if (hasExt) {
|
|
int maxFilenameLen;
|
|
for (index = 0;
|
|
index < EXT_SIZE && extIndex + index + 1 < udfLen;
|
|
index++) {
|
|
curr = udfName[extIndex + index + 1];
|
|
|
|
if (curr == '/' || curr == 0) {
|
|
needsCRC = 1;
|
|
curr = ILLEGAL_CHAR_MARK;
|
|
while (extIndex + index + 2 < udfLen &&
|
|
(index + 1 < EXT_SIZE &&
|
|
(udfName[extIndex + index + 2] == '/' ||
|
|
udfName[extIndex + index + 2] == 0)))
|
|
index++;
|
|
}
|
|
ext[localExtIndex++] = curr;
|
|
}
|
|
maxFilenameLen = newLen - CRC_LEN - localExtIndex;
|
|
if (newIndex > maxFilenameLen)
|
|
newIndex = maxFilenameLen;
|
|
else
|
|
newIndex = newExtIndex;
|
|
} else if (newIndex > newLen - CRC_LEN)
|
|
newIndex = newLen - CRC_LEN;
|
|
newName[newIndex++] = CRC_MARK;
|
|
valueCRC = crc_itu_t(0, fidName, fidNameLen);
|
|
newName[newIndex++] = hex_asc_upper_hi(valueCRC >> 8);
|
|
newName[newIndex++] = hex_asc_upper_lo(valueCRC >> 8);
|
|
newName[newIndex++] = hex_asc_upper_hi(valueCRC);
|
|
newName[newIndex++] = hex_asc_upper_lo(valueCRC);
|
|
|
|
if (hasExt) {
|
|
newName[newIndex++] = EXT_MARK;
|
|
for (index = 0; index < localExtIndex; index++)
|
|
newName[newIndex++] = ext[index];
|
|
}
|
|
}
|
|
|
|
return newIndex;
|
|
}
|