Re: [PATCH 01/10] udf: udf_CS0toUTF8 cleanup

[Jan Kara <jack@suse.cz>]

On Wed 30-01-08 22:03:51, marcin.slusarz@gmail.com wrote:
> - fix error handling - always zero output variable
> - don't zero explicitely fields zeroed by memset
> - mark "in" paramater as const
> - remove outdated comment
> 
> Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
> Cc: Jan Kara <jack@suse.cz>
  Acked-by: Jan Kara <jack@suse.cz>

							Honza
> ---
>  fs/udf/udfdecl.h |    2 +-
>  fs/udf/unicode.c |   27 ++++++++++-----------------
>  2 files changed, 11 insertions(+), 18 deletions(-)
> 
> diff --git a/fs/udf/udfdecl.h b/fs/udf/udfdecl.h
> index 681dc2b..0c525e8 100644
> --- a/fs/udf/udfdecl.h
> +++ b/fs/udf/udfdecl.h
> @@ -157,7 +157,7 @@ extern int udf_get_filename(struct super_block *, uint8_t *, uint8_t *, int);
>  extern int udf_put_filename(struct super_block *, const uint8_t *, uint8_t *,
>  			    int);
>  extern int udf_build_ustr(struct ustr *, dstring *, int);
> -extern int udf_CS0toUTF8(struct ustr *, struct ustr *);
> +extern int udf_CS0toUTF8(struct ustr *, const struct ustr *);
>  
>  /* ialloc.c */
>  extern void udf_free_inode(struct inode *);
> diff --git a/fs/udf/unicode.c b/fs/udf/unicode.c
> index e533b11..f969617 100644
> --- a/fs/udf/unicode.c
> +++ b/fs/udf/unicode.c
> @@ -83,9 +83,6 @@ static int udf_build_ustr_exact(struct ustr *dest, dstring *ptr, int exactsize)
>   * PURPOSE
>   *	Convert OSTA Compressed Unicode to the UTF-8 equivalent.
>   *
> - * DESCRIPTION
> - *	This routine is only called by udf_filldir().
> - *
>   * PRE-CONDITIONS
>   *	utf			Pointer to UTF-8 output buffer.
>   *	ocu			Pointer to OSTA Compressed Unicode input buffer
> @@ -99,43 +96,39 @@ static int udf_build_ustr_exact(struct ustr *dest, dstring *ptr, int exactsize)
>   *	November 12, 1997 - Andrew E. Mileski
>   *	Written, tested, and released.
>   */
> -int udf_CS0toUTF8(struct ustr *utf_o, struct ustr *ocu_i)
> +int udf_CS0toUTF8(struct ustr *utf_o, const struct ustr *ocu_i)
>  {
> -	uint8_t *ocu;
> -	uint32_t c;
> +	const uint8_t *ocu;
>  	uint8_t cmp_id, ocu_len;
>  	int i;
>  
> -	ocu = ocu_i->u_name;
> -
>  	ocu_len = ocu_i->u_len;
> -	cmp_id = ocu_i->u_cmpID;
> -	utf_o->u_len = 0;
> -
>  	if (ocu_len == 0) {
>  		memset(utf_o, 0, sizeof(struct ustr));
> -		utf_o->u_cmpID = 0;
> -		utf_o->u_len = 0;
>  		return 0;
>  	}
>  
> -	if ((cmp_id != 8) && (cmp_id != 16)) {
> +	cmp_id = ocu_i->u_cmpID;
> +	if (cmp_id != 8 && cmp_id != 16) {
> +		memset(utf_o, 0, sizeof(struct ustr));
>  		printk(KERN_ERR "udf: unknown compression code (%d) stri=%s\n",
>  		       cmp_id, ocu_i->u_name);
>  		return 0;
>  	}
>  
> +	ocu = ocu_i->u_name;
> +	utf_o->u_len = 0;
>  	for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN - 3));) {
>  
>  		/* Expand OSTA compressed Unicode to Unicode */
> -		c = ocu[i++];
> +		uint32_t c = ocu[i++];
>  		if (cmp_id == 16)
>  			c = (c << 8) | ocu[i++];
>  
>  		/* Compress Unicode to UTF-8 */
> -		if (c < 0x80U) {
> +		if (c < 0x80U)
>  			utf_o->u_name[utf_o->u_len++] = (uint8_t)c;
> -		} else if (c < 0x800U) {
> +		else if (c < 0x800U) {
>  			utf_o->u_name[utf_o->u_len++] =
>  						(uint8_t)(0xc0 | (c >> 6));
>  			utf_o->u_name[utf_o->u_len++] =
> -- 
> 1.5.3.7
> 
-- 
Jan Kara <jack@suse.cz>
SUSE Labs, CR