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NLS: update handling of Unicode

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This patch (as1239) updates the kernel's treatment of Unicode.  The
character-set conversion routines are well behind the current state of
the Unicode specification: They don't recognize the existence of code
points beyond plane 0 or of surrogate pairs in the UTF-16 encoding.

The old wchar_t 16-bit type is retained because it's still used in
lots of places.  This shouldn't cause any new problems; if a
conversion now results in an invalid 16-bit code then before it must
have yielded an undefined code.

Difficult-to-read names like "utf_mbstowcs" are replaced with more
transparent names like "utf8s_to_utf16s" and the ordering of the
parameters is rationalized (buffer lengths come immediate after the
pointers they refer to, and the inputs precede the outputs).
Fortunately the low-level conversion routines are used in only a few
places; the interfaces to the higher-level uni2char and char2uni
methods have been left unchanged.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2009-04-30 10:08:18 -04:00 committed by Greg Kroah-Hartman
parent a853a3d4eb
commit 74675a5850
9 changed files with 183 additions and 138 deletions
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10
drivers/usb/core/message.c
View file

@ -780,14 +780,13 @@ int usb_string(struct usb_device *dev, int index, char *buf, size_t size)
{
unsigned char *tbuf;
int err;
unsigned int u;
if (dev->state == USB_STATE_SUSPENDED)
return -EHOSTUNREACH;
if (size <= 0 || !buf || !index)
return -EINVAL;
buf[0] = 0;
tbuf = kmalloc(256 + 2, GFP_NOIO);
tbuf = kmalloc(256, GFP_NOIO);
if (!tbuf)
return -ENOMEM;
@ -814,12 +813,9 @@ int usb_string(struct usb_device *dev, int index, char *buf, size_t size)
if (err < 0)
goto errout;
for (u = 2; u < err; u += 2)
le16_to_cpus((u16 *)&tbuf[u]);
tbuf[u] = 0;
tbuf[u + 1] = 0;
size--; /* leave room for trailing NULL char in output buffer */
err = utf8_wcstombs(buf, (u16 *)&tbuf[2], size);
err = utf16s_to_utf8s((wchar_t *) &tbuf[2], (err - 2) / 2,
UTF16_LITTLE_ENDIAN, buf, size);
buf[err] = 0;
if (tbuf[1] != USB_DT_STRING)

22
fs/befs/linuxvfs.c
View file

@ -513,7 +513,7 @@ befs_utf2nls(struct super_block *sb, const char *in,
{
struct nls_table *nls = BEFS_SB(sb)->nls;
int i, o;
wchar_t uni;
unicode_t uni;
int unilen, utflen;
char *result;
/* The utf8->nls conversion won't make the final nls string bigger
@ -539,16 +539,16 @@ befs_utf2nls(struct super_block *sb, const char *in,
for (i = o = 0; i < in_len; i += utflen, o += unilen) {
/* convert from UTF-8 to Unicode */
utflen = utf8_mbtowc(&uni, &in[i], in_len - i);
if (utflen < 0) {
utflen = utf8_to_utf32(&in[i], in_len - i, &uni);
if (utflen < 0)
goto conv_err;
}
/* convert from Unicode to nls */
unilen = nls->uni2char(uni, &result[o], in_len - o);
if (unilen < 0) {
if (uni > MAX_WCHAR_T)
goto conv_err;
unilen = nls->uni2char(uni, &result[o], in_len - o);
if (unilen < 0)
goto conv_err;
}
}
result[o] = '\0';
*out_len = o;
@ -619,15 +619,13 @@ befs_nls2utf(struct super_block *sb, const char *in,
/* convert from nls to unicode */
unilen = nls->char2uni(&in[i], in_len - i, &uni);
if (unilen < 0) {
if (unilen < 0)
goto conv_err;
}
/* convert from unicode to UTF-8 */
utflen = utf8_wctomb(&result[o], uni, 3);
if (utflen <= 0) {
utflen = utf32_to_utf8(uni, &result[o], 3);
if (utflen <= 0)
goto conv_err;
}
}
result[o] = '\0';

29
fs/fat/dir.c
View file

@ -22,6 +22,19 @@
#include <asm/uaccess.h>
#include "fat.h"
/*
* Maximum buffer size of short name.
* [(MSDOS_NAME + '.') * max one char + nul]
* For msdos style, ['.' (hidden) + MSDOS_NAME + '.' + nul]
*/
#define FAT_MAX_SHORT_SIZE ((MSDOS_NAME + 1) * NLS_MAX_CHARSET_SIZE + 1)
/*
* Maximum buffer size of unicode chars from slots.
* [(max longname slots * 13 (size in a slot) + nul) * sizeof(wchar_t)]
*/
#define FAT_MAX_UNI_CHARS ((MSDOS_SLOTS - 1) * 13 + 1)
#define FAT_MAX_UNI_SIZE (FAT_MAX_UNI_CHARS * sizeof(wchar_t))
static inline loff_t fat_make_i_pos(struct super_block *sb,
struct buffer_head *bh,
struct msdos_dir_entry *de)
@ -171,7 +184,8 @@ static inline int fat_uni_to_x8(struct msdos_sb_info *sbi, const wchar_t *uni,
unsigned char *buf, int size)
{
if (sbi->options.utf8)
return utf8_wcstombs(buf, uni, size);
return utf16s_to_utf8s(uni, FAT_MAX_UNI_CHARS,
UTF16_HOST_ENDIAN, buf, size);
else
return uni16_to_x8(buf, uni, size, sbi->options.unicode_xlate,
sbi->nls_io);
@ -324,19 +338,6 @@ parse_long:
return 0;
}
/*
* Maximum buffer size of short name.
* [(MSDOS_NAME + '.') * max one char + nul]
* For msdos style, ['.' (hidden) + MSDOS_NAME + '.' + nul]
*/
#define FAT_MAX_SHORT_SIZE ((MSDOS_NAME + 1) * NLS_MAX_CHARSET_SIZE + 1)
/*
* Maximum buffer size of unicode chars from slots.
* [(max longname slots * 13 (size in a slot) + nul) * sizeof(wchar_t)]
*/
#define FAT_MAX_UNI_CHARS ((MSDOS_SLOTS - 1) * 13 + 1)
#define FAT_MAX_UNI_SIZE (FAT_MAX_UNI_CHARS * sizeof(wchar_t))
/*
* Return values: negative -> error, 0 -> not found, positive -> found,
* value is the total amount of slots, including the shortname entry.

4
fs/fat/namei_vfat.c
View file

@ -502,11 +502,11 @@ xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
if (utf8) {
int name_len = strlen(name);
*outlen = utf8_mbstowcs((wchar_t *)outname, name, PATH_MAX);
*outlen = utf8s_to_utf16s(name, PATH_MAX, (wchar_t *) outname);
/*
* We stripped '.'s before and set len appropriately,
* but utf8_mbstowcs doesn't care about len
* but utf8s_to_utf16s doesn't care about len
*/
*outlen -= (name_len - len);

36
fs/isofs/joliet.c
View file

@ -37,37 +37,6 @@ uni16_to_x8(unsigned char *ascii, __be16 *uni, int len, struct nls_table *nls)
return (op - ascii);
}
/* Convert big endian wide character string to utf8 */
static int
wcsntombs_be(__u8 *s, const __u8 *pwcs, int inlen, int maxlen)
{
const __u8 *ip;
__u8 *op;
int size;
__u16 c;
op = s;
ip = pwcs;
while ((*ip || ip[1]) && (maxlen > 0) && (inlen > 0)) {
c = (*ip << 8) | ip[1];
if (c > 0x7f) {
size = utf8_wctomb(op, c, maxlen);
if (size == -1) {
/* Ignore character and move on */
maxlen--;
} else {
op += size;
maxlen -= size;
}
} else {
*op++ = (__u8) c;
}
ip += 2;
inlen--;
}
return (op - s);
}
int
get_joliet_filename(struct iso_directory_record * de, unsigned char *outname, struct inode * inode)
{
@ -79,8 +48,9 @@ get_joliet_filename(struct iso_directory_record * de, unsigned char *outname, st
nls = ISOFS_SB(inode->i_sb)->s_nls_iocharset;
if (utf8) {
len = wcsntombs_be(outname, de->name,
de->name_len[0] >> 1, PAGE_SIZE);
len = utf16s_to_utf8s((const wchar_t *) de->name,
de->name_len[0] >> 1, UTF16_BIG_ENDIAN,
outname, PAGE_SIZE);
} else {
len = uni16_to_x8(outname, (__be16 *) de->name,
de->name_len[0] >> 1, nls);

8
fs/ncpfs/ncplib_kernel.c
View file

@ -1113,11 +1113,13 @@ ncp__io2vol(struct ncp_server *server, unsigned char *vname, unsigned int *vlen,
if (NCP_IS_FLAG(server, NCP_FLAG_UTF8)) {
int k;
unicode_t u;
k = utf8_mbtowc(&ec, iname, iname_end - iname);
if (k < 0)
k = utf8_to_utf32(iname, iname_end - iname, &u);
if (k < 0 || u > MAX_WCHAR_T)
return -EINVAL;
iname += k;
ec = u;
} else {
if (*iname == NCP_ESC) {
int k;
@ -1214,7 +1216,7 @@ ncp__vol2io(struct ncp_server *server, unsigned char *iname, unsigned int *ilen,
if (NCP_IS_FLAG(server, NCP_FLAG_UTF8)) {
int k;
k = utf8_wctomb(iname, ec, iname_end - iname);
k = utf32_to_utf8(ec, iname, iname_end - iname);
if (k < 0) {
err = -ENAMETOOLONG;
goto quit;

164
fs/nls/nls_base.c
View file

@ -15,6 +15,7 @@
#include <linux/errno.h>
#include <linux/kmod.h>
#include <linux/spinlock.h>
#include <asm/byteorder.h>
static struct nls_table default_table;
static struct nls_table *tables = &default_table;
@ -43,10 +44,17 @@ static const struct utf8_table utf8_table[] =
{0, /* end of table */}
};
int
utf8_mbtowc(wchar_t *p, const __u8 *s, int n)
#define UNICODE_MAX 0x0010ffff
#define PLANE_SIZE 0x00010000
#define SURROGATE_MASK 0xfffff800
#define SURROGATE_PAIR 0x0000d800
#define SURROGATE_LOW 0x00000400
#define SURROGATE_BITS 0x000003ff
int utf8_to_utf32(const u8 *s, int len, unicode_t *pu)
{
long l;
unsigned long l;
int c0, c, nc;
const struct utf8_table *t;
@ -57,12 +65,13 @@ utf8_mbtowc(wchar_t *p, const __u8 *s, int n)
nc++;
if ((c0 & t->cmask) == t->cval) {
l &= t->lmask;
if (l < t->lval)
if (l < t->lval || l > UNICODE_MAX ||
(l & SURROGATE_MASK) == SURROGATE_PAIR)
return -1;
*p = l;
*pu = (unicode_t) l;
return nc;
}
if (n <= nc)
if (len <= nc)
return -1;
s++;
c = (*s ^ 0x80) & 0xFF;
@ -72,76 +81,119 @@ utf8_mbtowc(wchar_t *p, const __u8 *s, int n)
}
return -1;
}
EXPORT_SYMBOL(utf8_to_utf32);
int
utf8_mbstowcs(wchar_t *pwcs, const __u8 *s, int n)
int utf32_to_utf8(unicode_t u, u8 *s, int maxlen)
{
__u16 *op;
const __u8 *ip;
int size;
op = pwcs;
ip = s;
while (*ip && n > 0) {
if (*ip & 0x80) {
size = utf8_mbtowc(op, ip, n);
if (size == -1) {
/* Ignore character and move on */
ip++;
n--;
} else {
op++;
ip += size;
n -= size;
}
} else {
*op++ = *ip++;
n--;
}
}
return (op - pwcs);
}
int
utf8_wctomb(__u8 *s, wchar_t wc, int maxlen)
{
long l;
unsigned long l;
int c, nc;
const struct utf8_table *t;
if (!s)
return 0;
l = wc;
l = u;
if (l > UNICODE_MAX || (l & SURROGATE_MASK) == SURROGATE_PAIR)
return -1;
nc = 0;
for (t = utf8_table; t->cmask && maxlen; t++, maxlen--) {
nc++;
if (l <= t->lmask) {
c = t->shift;
*s = t->cval | (l >> c);
*s = (u8) (t->cval | (l >> c));
while (c > 0) {
c -= 6;
s++;
*s = 0x80 | ((l >> c) & 0x3F);
*s = (u8) (0x80 | ((l >> c) & 0x3F));
}
return nc;
}
}
return -1;
}
EXPORT_SYMBOL(utf32_to_utf8);
int
utf8_wcstombs(__u8 *s, const wchar_t *pwcs, int maxlen)
int utf8s_to_utf16s(const u8 *s, int len, wchar_t *pwcs)
{
const __u16 *ip;
__u8 *op;
u16 *op;
int size;
unicode_t u;
op = pwcs;
while (*s && len > 0) {
if (*s & 0x80) {
size = utf8_to_utf32(s, len, &u);
if (size < 0) {
/* Ignore character and move on */
size = 1;
} else if (u >= PLANE_SIZE) {
u -= PLANE_SIZE;
*op++ = (wchar_t) (SURROGATE_PAIR |
((u >> 10) & SURROGATE_BITS));
*op++ = (wchar_t) (SURROGATE_PAIR |
SURROGATE_LOW |
(u & SURROGATE_BITS));
} else {
*op++ = (wchar_t) u;
}
s += size;
len -= size;
} else {
*op++ = *s++;
len--;
}
}
return op - pwcs;
}
EXPORT_SYMBOL(utf8s_to_utf16s);
static inline unsigned long get_utf16(unsigned c, enum utf16_endian endian)
{
switch (endian) {
default:
return c;
case UTF16_LITTLE_ENDIAN:
return __le16_to_cpu(c);
case UTF16_BIG_ENDIAN:
return __be16_to_cpu(c);
}
}
int utf16s_to_utf8s(const wchar_t *pwcs, int len, enum utf16_endian endian,
u8 *s, int maxlen)
{
u8 *op;
int size;
unsigned long u, v;
op = s;
ip = pwcs;
while (*ip && maxlen > 0) {
if (*ip > 0x7f) {
size = utf8_wctomb(op, *ip, maxlen);
while (len > 0 && maxlen > 0) {
u = get_utf16(*pwcs, endian);
if (!u)
break;
pwcs++;
len--;
if (u > 0x7f) {
if ((u & SURROGATE_MASK) == SURROGATE_PAIR) {
if (u & SURROGATE_LOW) {
/* Ignore character and move on */
continue;
}
if (len <= 0)
break;
v = get_utf16(*pwcs, endian);
if ((v & SURROGATE_MASK) != SURROGATE_PAIR ||
!(v & SURROGATE_LOW)) {
/* Ignore character and move on */
continue;
}
u = PLANE_SIZE + ((u & SURROGATE_BITS) << 10)
+ (v & SURROGATE_BITS);
pwcs++;
len--;
}
size = utf32_to_utf8(u, op, maxlen);
if (size == -1) {
/* Ignore character and move on */
} else {
@ -149,13 +201,13 @@ utf8_wcstombs(__u8 *s, const wchar_t *pwcs, int maxlen)
maxlen -= size;
}
} else {
*op++ = (__u8) *ip;
*op++ = (u8) u;
maxlen--;
}
ip++;
}
return (op - s);
return op - s;
}
EXPORT_SYMBOL(utf16s_to_utf8s);
int register_nls(struct nls_table * nls)
{
@ -467,9 +519,5 @@ EXPORT_SYMBOL(unregister_nls);
EXPORT_SYMBOL(unload_nls);
EXPORT_SYMBOL(load_nls);
EXPORT_SYMBOL(load_nls_default);
EXPORT_SYMBOL(utf8_mbtowc);
EXPORT_SYMBOL(utf8_mbstowcs);
EXPORT_SYMBOL(utf8_wctomb);
EXPORT_SYMBOL(utf8_wcstombs);
MODULE_LICENSE("Dual BSD/GPL");

13
fs/nls/nls_utf8.c
View file

@ -15,7 +15,11 @@ static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
{
int n;
if ( (n = utf8_wctomb(out, uni, boundlen)) == -1) {
if (boundlen <= 0)
return -ENAMETOOLONG;
n = utf32_to_utf8(uni, out, boundlen);
if (n < 0) {
*out = '?';
return -EINVAL;
}
@ -25,11 +29,14 @@ static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
{
int n;
unicode_t u;
if ( (n = utf8_mbtowc(uni, rawstring, boundlen)) == -1) {
n = utf8_to_utf32(rawstring, boundlen, &u);
if (n < 0 || u > MAX_WCHAR_T) {
*uni = 0x003f; /* ? */
n = -EINVAL;
return -EINVAL;
}
*uni = (wchar_t) u;
return n;
}

35
include/linux/nls.h
View file

@ -3,8 +3,23 @@
#include <linux/init.h>
/* unicode character */
typedef __u16 wchar_t;
/* Unicode has changed over the years. Unicode code points no longer
* fit into 16 bits; as of Unicode 5 valid code points range from 0
* to 0x10ffff (17 planes, where each plane holds 65536 code points).
*
* The original decision to represent Unicode characters as 16-bit
* wchar_t values is now outdated. But plane 0 still includes the
* most commonly used characters, so we will retain it. The newer
* 32-bit unicode_t type can be used when it is necessary to
* represent the full Unicode character set.
*/
/* Plane-0 Unicode character */
typedef u16 wchar_t;
#define MAX_WCHAR_T 0xffff
/* Arbitrary Unicode character */
typedef u32 unicode_t;
struct nls_table {
const char *charset;
@ -21,6 +36,13 @@ struct nls_table {
/* this value hold the maximum octet of charset */
#define NLS_MAX_CHARSET_SIZE 6 /* for UTF-8 */
/* Byte order for UTF-16 strings */
enum utf16_endian {
UTF16_HOST_ENDIAN,
UTF16_LITTLE_ENDIAN,
UTF16_BIG_ENDIAN
};
/* nls.c */
extern int register_nls(struct nls_table *);
extern int unregister_nls(struct nls_table *);
@ -28,10 +50,11 @@ extern struct nls_table *load_nls(char *);
extern void unload_nls(struct nls_table *);
extern struct nls_table *load_nls_default(void);
extern int utf8_mbtowc(wchar_t *, const __u8 *, int);
extern int utf8_mbstowcs(wchar_t *, const __u8 *, int);
extern int utf8_wctomb(__u8 *, wchar_t, int);
extern int utf8_wcstombs(__u8 *, const wchar_t *, int);
extern int utf8_to_utf32(const u8 *s, int len, unicode_t *pu);
extern int utf32_to_utf8(unicode_t u, u8 *s, int maxlen);
extern int utf8s_to_utf16s(const u8 *s, int len, wchar_t *pwcs);
extern int utf16s_to_utf8s(const wchar_t *pwcs, int len,
enum utf16_endian endian, u8 *s, int maxlen);
static inline unsigned char nls_tolower(struct nls_table *t, unsigned char c)
{