> Index: 2.6.16-rc4-inflate/lib/inflate.c
> ===================================================================
> --- 2.6.16-rc4-inflate.orig/lib/inflate.c 2006-02-22 17:16:07.000000000 -0600
> +++ 2.6.16-rc4-inflate/lib/inflate.c 2006-02-22 17:16:08.000000000 -0600
> @@ -117,12 +117,12 @@
> an unused code. If a code with e == 99 is looked up, this implies an
> error in the data. */
> struct huft {
> - u8 e; /* number of extra bits or operation */
> - u8 b; /* number of bits in this code or subcode */
> union {
> - u16 n; /* literal, length base, or distance base */
> - struct huft *t; /* pointer to next level of table */
> - } v;
> + u16 val; /* literal, length base, or distance base */
> + struct huft *next; /* pointer to next level of table */
> + };
> + u8 extra; /* number of extra bits or operation */
> + u8 bits; /* number of bits in this code or subcode */
> };
How aggressive do you want to be? About 3.7 years ago in
http://freshmeat.net/projects/gzip_x86/ I published:
-----
typedef unsigned short huft_ndx; /* index>>1 */
struct huft {
uch e; /* number of extra bits or operation */
uch b; /* number of bits in this code or subcode */
union {
ush n; /* literal, length base, or distance base */
huft_ndx t; /* index>>1 of next level of table */
} v;
};
-----
which makes 4==sizeof(struct huft) and enables manipulation by 32-bit
fetch, exposing 'e' [extra] and 'b' [bits] in x86 byte registers
for fewer shift-and-mask operations. The struct huft can be managed
as a stack of maximum length 1014.
--
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