Re: [PATCH v2 06/53] CIFS: Add missing unicode handling routines needed by smb2

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, 12 Jan 2012 11:22:35 -0600
Shirish Pargaonkar <shirishpargaonkar@xxxxxxxxx> wrote:

> On Fri, Oct 28, 2011 at 2:54 PM, Pavel Shilovsky <piastry@xxxxxxxxxxx> wrote:
> > From: Steve French <sfrench@xxxxxxxxxx>
> >
> > Signed-off-by: Steve French <sfrench@xxxxxxxxxx>
> > Signed-off-by: Pavel Shilovsky <piastry@xxxxxxxxxxx>
> > ---
> >  fs/cifs/cifs_unicode.c |   61 ++++++++++++++++++++++++++++++++++++++++++++++++
> >  fs/cifs/cifs_unicode.h |    7 +++++
> >  2 files changed, 68 insertions(+), 0 deletions(-)
> >
> > diff --git a/fs/cifs/cifs_unicode.c b/fs/cifs/cifs_unicode.c
> > index 1b2e180..7f09423 100644
> > --- a/fs/cifs/cifs_unicode.c
> > +++ b/fs/cifs/cifs_unicode.c
> > @@ -330,3 +330,64 @@ ctoUCS_out:
> >        return i;
> >  }
> >
> > +#ifdef CONFIG_CIFS_SMB2
> > +/*
> > + * smb2_local_to_ucs2_bytes - how long will a string be after conversion?
> > + * @from - pointer to input string
> > + * @maxbytes - don't go past this many bytes of input string
> > + * @codepage - source codepage
> > + *
> > + * Walk a string and return the number of bytes that the string will
> > + * be after being converted to the given charset, not including any null
> > + * termination required. Don't walk past maxbytes in the source buffer.
> > + */
> > +
> > +int
> > +smb2_local_to_ucs2_bytes(const char *from, int len,
> > +                         const struct nls_table *codepage)
> > +{
> > +       int charlen;
> > +       int i;
> > +       wchar_t wchar_to;
> > +
> > +       if (from == NULL)
> > +               return 0;
> > +       for (i = 0; len && *from; i++, from += charlen, len -= charlen) {
> > +               charlen = codepage->char2uni(from, len, &wchar_to);
> 
> Why call function char2uni?  It either returns 1 or EINVAL.
> If it returns EINVAL, charlen is set to 1.  So either way charlen
> will always be 1.
> So why not just call strlen(from) to determine the length of the string?
> 

I thought char2uni returned the width of the character. That's not
necessarily going to be 1 in all cases.

> > +               /* Failed conversion defaults to a question mark */
> > +               if (charlen < 1)
> > +                       charlen = 1;
> > +       }
> > +       return 2 * i; /* UCS characters are two bytes */
> > +}
> > +
> > +/*
> > + * smb2_strndup_to_ucs - copy a string to wire format from the local codepage
> > + * @src - source string
> > + * @maxlen - don't walk past this many bytes in the source string
> > + * @ucslen - the length of the allocated string in bytes (including null)
> > + * @codepage - source codepage
> > + *
> > + * Take a string convert it from the local codepage to UCS2 and
> > + * put it in a new buffer. Returns a pointer to the new string or NULL on
> > + * error.
> > + */
> > +__le16 *
> > +smb2_strndup_to_ucs(const char *src, const int maxlen, int *ucs_len,
> > +            const struct nls_table *codepage)
> > +{
> > +       int len;
> > +       __le16 *dst;
> > +
> > +       len = smb2_local_to_ucs2_bytes(src, maxlen, codepage);
> > +       len += 2; /* NULL */
> > +       dst = kmalloc(len, GFP_KERNEL);
> > +       if (!dst) {
> > +               *ucs_len = 0;
> > +               return NULL;
> > +       }
> > +       cifs_strtoUCS(dst, src, maxlen, codepage);
> > +       *ucs_len = len;
> > +       return dst;
> > +}
> > +#endif /* CONFIG_CIFS_SMB2 */
> > diff --git a/fs/cifs/cifs_unicode.h b/fs/cifs/cifs_unicode.h
> > index 6d02fd5..e00f677 100644
> > --- a/fs/cifs/cifs_unicode.h
> > +++ b/fs/cifs/cifs_unicode.h
> > @@ -380,4 +380,11 @@ UniStrlwr(register wchar_t *upin)
> >
> >  #endif
> >
> > +#ifdef CONFIG_CIFS_SMB2
> > +extern int smb2_local_to_ucs2_bytes(const char *from, int len,
> > +                                   const struct nls_table *codepage);
> > +extern __le16 *smb2_strndup_to_ucs(const char *src, const int maxlen,
> > +                                  int *ucs_len, const struct nls_table *cp);
> > +#endif /* CONFIG_CIFS_SMB2 */
> > +
> >  #endif /* _CIFS_UNICODE_H */
> > --
> > 1.7.1
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-cifs" in
> > the body of a message to majordomo@xxxxxxxxxxxxxxx
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> --
> To unsubscribe from this list: send the line "unsubscribe linux-cifs" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at  http://vger.kernel.org/majordomo-info.html


-- 
Jeff Layton <jlayton@xxxxxxxxx>
--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]
  Powered by Linux