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authorAlan Stern <stern@rowland.harvard.edu>2011-11-17 16:42:19 -0500
committerWilly Tarreau <w@1wt.eu>2013-06-10 11:43:21 +0200
commit9ecb77213c3f5393deaf3d9c942d25ce31f80074 (patch)
treec2f329fce8458c046a4061a5c6050f90095e2545
parentc71109d6d398e60fbe55102ae752f1c036cce27b (diff)
NLS: improve UTF8 -> UTF16 string conversion routine
commit 0720a06a7518c9d0c0125bd5d1f3b6264c55c3dd upstream. The utf8s_to_utf16s conversion routine needs to be improved. Unlike its utf16s_to_utf8s sibling, it doesn't accept arguments specifying the maximum length of the output buffer or the endianness of its 16-bit output. This patch (as1501) adds the two missing arguments, and adjusts the only two places in the kernel where the function is called. A follow-on patch will add a third caller that does utilize the new capabilities. The two conversion routines are still annoyingly inconsistent in the way they handle invalid byte combinations. But that's a subject for a different patch. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> CC: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> [bwh: Bakckported to 2.6.32: drop Hyper-V change] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Willy Tarreau <w@1wt.eu>
-rw-r--r--fs/fat/namei_vfat.c3
-rw-r--r--fs/nls/nls_base.c43
-rw-r--r--include/linux/nls.h5
3 files changed, 38 insertions, 13 deletions
diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index 67b3df1feae6..4251f357943c 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -499,7 +499,8 @@ xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
int charlen;
if (utf8) {
- *outlen = utf8s_to_utf16s(name, len, (wchar_t *)outname);
+ *outlen = utf8s_to_utf16s(name, len, UTF16_HOST_ENDIAN,
+ (wchar_t *) outname, FAT_LFN_LEN + 2);
if (*outlen < 0)
return *outlen;
else if (*outlen > FAT_LFN_LEN)
diff --git a/fs/nls/nls_base.c b/fs/nls/nls_base.c
index 44a88a9fa2c8..0eb059ec6f28 100644
--- a/fs/nls/nls_base.c
+++ b/fs/nls/nls_base.c
@@ -114,34 +114,57 @@ int utf32_to_utf8(unicode_t u, u8 *s, int maxlen)
}
EXPORT_SYMBOL(utf32_to_utf8);
-int utf8s_to_utf16s(const u8 *s, int len, wchar_t *pwcs)
+static inline void put_utf16(wchar_t *s, unsigned c, enum utf16_endian endian)
+{
+ switch (endian) {
+ default:
+ *s = (wchar_t) c;
+ break;
+ case UTF16_LITTLE_ENDIAN:
+ *s = __cpu_to_le16(c);
+ break;
+ case UTF16_BIG_ENDIAN:
+ *s = __cpu_to_be16(c);
+ break;
+ }
+}
+
+int utf8s_to_utf16s(const u8 *s, int len, enum utf16_endian endian,
+ wchar_t *pwcs, int maxlen)
{
u16 *op;
int size;
unicode_t u;
op = pwcs;
- while (*s && len > 0) {
+ while (len > 0 && maxlen > 0 && *s) {
if (*s & 0x80) {
size = utf8_to_utf32(s, len, &u);
if (size < 0)
return -EINVAL;
+ s += size;
+ len -= size;
if (u >= PLANE_SIZE) {
+ if (maxlen < 2)
+ break;
u -= PLANE_SIZE;
- *op++ = (wchar_t) (SURROGATE_PAIR |
- ((u >> 10) & SURROGATE_BITS));
- *op++ = (wchar_t) (SURROGATE_PAIR |
+ put_utf16(op++, SURROGATE_PAIR |
+ ((u >> 10) & SURROGATE_BITS),
+ endian);
+ put_utf16(op++, SURROGATE_PAIR |
SURROGATE_LOW |
- (u & SURROGATE_BITS));
+ (u & SURROGATE_BITS),
+ endian);
+ maxlen -= 2;
} else {
- *op++ = (wchar_t) u;
+ put_utf16(op++, u, endian);
+ maxlen--;
}
- s += size;
- len -= size;
} else {
- *op++ = *s++;
+ put_utf16(op++, *s++, endian);
len--;
+ maxlen--;
}
}
return op - pwcs;
diff --git a/include/linux/nls.h b/include/linux/nls.h
index d47beef08dfd..5dc635f8d79e 100644
--- a/include/linux/nls.h
+++ b/include/linux/nls.h
@@ -43,7 +43,7 @@ enum utf16_endian {
UTF16_BIG_ENDIAN
};
-/* nls.c */
+/* nls_base.c */
extern int register_nls(struct nls_table *);
extern int unregister_nls(struct nls_table *);
extern struct nls_table *load_nls(char *);
@@ -52,7 +52,8 @@ extern struct nls_table *load_nls_default(void);
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 utf8s_to_utf16s(const u8 *s, int len,
+ enum utf16_endian endian, wchar_t *pwcs, int maxlen);
extern int utf16s_to_utf8s(const wchar_t *pwcs, int len,
enum utf16_endian endian, u8 *s, int maxlen);