Hi Ambroz,
On Fri, Feb 3, 2012 at 5:14 PM, Ambroz Bizjak <[email protected]> wrote:
> Hi,
>
> Here's an updated patch as you requested.
>
> Note that it implicitly fixes a small bug in the hash function that
> was introduced when modifying the eina code: the line "hash ^= key[2]
> << 18;" is supposed to be accessing the 3rd byte of the remainder of
> the input, but when 'it' was introduced, 'key' ('data' in eina code)
> was no longer incremented, so this ended up accessing the 3rd byte of
> the input from the beginning. This is fixed by iterating over 'key',
> like the eina code does.
yeah, indeed. Thanks a lot for doing this.
>
> As far as implementation of get16bits() is concerned, the "attribute
> packed" approach is the best; it avoids having to hardcode specific
> platforms, letting the compiler deal with the details of memory
> access. (and it works in every compiler this code is ever going to be
> compiled with; e.g. gcc and clang both support this)
Sure, we have something similar in BlueZ which IMO is even cleaner
(since the structure is not visible from outside):
/* Bluetooth unaligned access */
#define bt_get_unaligned(ptr) \
({ \
struct __attribute__((packed)) { \
typeof(*(ptr)) __v; \
} *__p = (void *) (ptr); \
__p->__v; \
})
But I'm happy with the patch the way it is.
Thanks. Patch has been applied.
Lucas De Marchi
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