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Message-ID: <4FB2E04E.6000702@gmail.com>
Date: Wed, 16 May 2012 01:01:34 +0200
From: Vladimir 'φ-coder/phcoder' Serbinenko
<phcoder@...il.com>
To: linux-fsdevel@...r.kernel.org, linux-cifs@...r.kernel.org,
samba-technical@...ts.samba.org,
jfs-discussion@...ts.sourceforge.net,
linux-ntfs-dev@...ts.sourceforge.net, linux-kernel@...r.kernel.org
CC: Steve French <sfrench@...ba.org>,
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
Dave Kleikamp <shaggy@...nel.org>,
Petr Vandrovec <petr@...drovec.name>,
Anton Altaparmakov <anton@...era.com>, Jan Kara <jack@...e.cz>,
Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH 2/8] Add some UTF-16 functions for convenience
Signed-off-by: Vladimir Serbinenko <phcoder@...il.com>
---
fs/nls/nls_base.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++
fs/nls/nls_utf8.c | 2 +-
include/linux/nls.h | 6 +++++
3 files changed, 70 insertions(+), 1 deletion(-)
diff --git a/fs/nls/nls_base.c b/fs/nls/nls_base.c
index 4f6d1ae..0c1ad5b 100644
--- a/fs/nls/nls_base.c
+++ b/fs/nls/nls_base.c
@@ -171,6 +171,32 @@ int utf8s_to_utf16s(const u8 *s, int inlen, enum utf16_endian endian,
}
EXPORT_SYMBOL(utf8s_to_utf16s);
+int unicode_to_utf16s(unicode_t u, enum utf16_endian endian,
+ wchar_t *pwcs, int maxout)
+{
+ u16 *op = pwcs;
+
+ op = pwcs;
+
+ if (u >= PLANE_SIZE) {
+ if (maxout < 2)
+ return -1;
+ u -= PLANE_SIZE;
+ put_utf16(op++, SURROGATE_PAIR |
+ ((u >> 10) & SURROGATE_BITS),
+ endian);
+ put_utf16(op++, SURROGATE_PAIR |
+ SURROGATE_LOW |
+ (u & SURROGATE_BITS),
+ endian);
+ return 2;
+ } else {
+ put_utf16(op++, u, endian);
+ return 1;
+ }
+}
+EXPORT_SYMBOL(unicode_to_utf16s);
+
static inline unsigned long get_utf16(unsigned c, enum utf16_endian endian)
{
switch (endian) {
@@ -232,6 +258,43 @@ int utf16s_to_utf8s(const wchar_t *pwcs, int inlen, enum utf16_endian endian,
}
EXPORT_SYMBOL(utf16s_to_utf8s);
+int utf16s_to_unicode(const wchar_t *pwcs, int inlen, enum utf16_endian endian,
+ unicode_t *uni)
+{
+ unsigned long u, v;
+ const wchar_t *pwcs0 = pwcs;
+
+ while (inlen > 0) {
+ u = get_utf16(*pwcs, endian);
+ if (!u)
+ break;
+ pwcs++;
+ inlen--;
+ if ((u & SURROGATE_MASK) == SURROGATE_PAIR) {
+ if (u & SURROGATE_LOW) {
+ /* Ignore character and move on */
+ continue;
+ }
+ if (inlen <= 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++;
+ inlen--;
+ }
+ *uni = u;
+ return pwcs - pwcs0;
+ }
+ return 0;
+}
+EXPORT_SYMBOL(utf16s_to_unicode);
+
int register_nls(struct nls_table * nls)
{
struct nls_table ** tmp = &tables;
diff --git a/fs/nls/nls_utf8.c b/fs/nls/nls_utf8.c
index eb6392e..a3b3de0 100644
--- a/fs/nls/nls_utf8.c
+++ b/fs/nls/nls_utf8.c
@@ -37,7 +37,7 @@ static int char2uni(const unsigned char *rawstring, int boundlen,
*uni = 0x003f; /* ? */
return -EINVAL;
}
- *uni = (wchar_t) u;
+ *uni = u;
return n;
}
diff --git a/include/linux/nls.h b/include/linux/nls.h
index c0292dd..7de1765 100644
--- a/include/linux/nls.h
+++ b/include/linux/nls.h
@@ -50,12 +50,18 @@ extern struct nls_table *load_nls(char *);
extern void unload_nls(struct nls_table *);
extern struct nls_table *load_nls_default(void);
+#define MAX_UTF16_PER_UNICODE 2
+
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,
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);
+int unicode_to_utf16s(unicode_t u, enum utf16_endian endian,
+ wchar_t *pwcs, int maxout);
+int utf16s_to_unicode(const wchar_t *pwcs, int inlen, enum utf16_endian endian,
+ unicode_t *uni);
static inline unsigned char nls_tolower(struct nls_table *t, unsigned char c)
{
--
1.7.10
--
Regards
Vladimir 'φ-coder/phcoder' Serbinenko
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