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Diffstat (limited to 'fs/nls/nls_base.c')
-rw-r--r--fs/nls/nls_base.c73
1 files changed, 48 insertions, 25 deletions
diff --git a/fs/nls/nls_base.c b/fs/nls/nls_base.c
index 44a88a9fa2c8..fea6bd5831dc 100644
--- a/fs/nls/nls_base.c
+++ b/fs/nls/nls_base.c
@@ -52,7 +52,7 @@ static const struct utf8_table utf8_table[] =
#define SURROGATE_LOW 0x00000400
#define SURROGATE_BITS 0x000003ff
-int utf8_to_utf32(const u8 *s, int len, unicode_t *pu)
+int utf8_to_utf32(const u8 *s, int inlen, unicode_t *pu)
{
unsigned long l;
int c0, c, nc;
@@ -71,7 +71,7 @@ int utf8_to_utf32(const u8 *s, int len, unicode_t *pu)
*pu = (unicode_t) l;
return nc;
}
- if (len <= nc)
+ if (inlen <= nc)
return -1;
s++;
c = (*s ^ 0x80) & 0xFF;
@@ -83,7 +83,7 @@ int utf8_to_utf32(const u8 *s, int len, unicode_t *pu)
}
EXPORT_SYMBOL(utf8_to_utf32);
-int utf32_to_utf8(unicode_t u, u8 *s, int maxlen)
+int utf32_to_utf8(unicode_t u, u8 *s, int maxout)
{
unsigned long l;
int c, nc;
@@ -97,7 +97,7 @@ int utf32_to_utf8(unicode_t u, u8 *s, int maxlen)
return -1;
nc = 0;
- for (t = utf8_table; t->cmask && maxlen; t++, maxlen--) {
+ for (t = utf8_table; t->cmask && maxout; t++, maxout--) {
nc++;
if (l <= t->lmask) {
c = t->shift;
@@ -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 inlen, enum utf16_endian endian,
+ wchar_t *pwcs, int maxout)
{
u16 *op;
int size;
unicode_t u;
op = pwcs;
- while (*s && len > 0) {
+ while (inlen > 0 && maxout > 0 && *s) {
if (*s & 0x80) {
- size = utf8_to_utf32(s, len, &u);
+ size = utf8_to_utf32(s, inlen, &u);
if (size < 0)
return -EINVAL;
+ s += size;
+ inlen -= size;
if (u >= PLANE_SIZE) {
+ if (maxout < 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);
+ maxout -= 2;
} else {
- *op++ = (wchar_t) u;
+ put_utf16(op++, u, endian);
+ maxout--;
}
- s += size;
- len -= size;
} else {
- *op++ = *s++;
- len--;
+ put_utf16(op++, *s++, endian);
+ inlen--;
+ maxout--;
}
}
return op - pwcs;
@@ -160,27 +183,27 @@ static inline unsigned long get_utf16(unsigned c, enum utf16_endian endian)
}
}
-int utf16s_to_utf8s(const wchar_t *pwcs, int len, enum utf16_endian endian,
- u8 *s, int maxlen)
+int utf16s_to_utf8s(const wchar_t *pwcs, int inlen, enum utf16_endian endian,
+ u8 *s, int maxout)
{
u8 *op;
int size;
unsigned long u, v;
op = s;
- while (len > 0 && maxlen > 0) {
+ while (inlen > 0 && maxout > 0) {
u = get_utf16(*pwcs, endian);
if (!u)
break;
pwcs++;
- len--;
+ inlen--;
if (u > 0x7f) {
if ((u & SURROGATE_MASK) == SURROGATE_PAIR) {
if (u & SURROGATE_LOW) {
/* Ignore character and move on */
continue;
}
- if (len <= 0)
+ if (inlen <= 0)
break;
v = get_utf16(*pwcs, endian);
if ((v & SURROGATE_MASK) != SURROGATE_PAIR ||
@@ -191,18 +214,18 @@ int utf16s_to_utf8s(const wchar_t *pwcs, int len, enum utf16_endian endian,
u = PLANE_SIZE + ((u & SURROGATE_BITS) << 10)
+ (v & SURROGATE_BITS);
pwcs++;
- len--;
+ inlen--;
}
- size = utf32_to_utf8(u, op, maxlen);
+ size = utf32_to_utf8(u, op, maxout);
if (size == -1) {
/* Ignore character and move on */
} else {
op += size;
- maxlen -= size;
+ maxout -= size;
}
} else {
*op++ = (u8) u;
- maxlen--;
+ maxout--;
}
}
return op - s;