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Remove offset pointer optimization in inftrees.c.

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6a043145ca
This commit is contained in:
Alex Kocharin 2022-06-08 19:00:40 +03:00
parent 024d11ee5f
commit f1c987cc5f
1 changed files with 8 additions and 12 deletions
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20
lib/zlib/inftrees.js
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@ -70,13 +70,11 @@ const inflate_table = (type, lens, lens_index, codes, table, table_index, work,
let mask; /* mask for low root bits */ let mask; /* mask for low root bits */
let next; /* next available space in table */ let next; /* next available space in table */
let base = null; /* base value table to use */ let base = null; /* base value table to use */
let base_index = 0;
// let shoextra; /* extra bits table to use */ // let shoextra; /* extra bits table to use */
let end; /* use base and extra for symbol > end */ let match; /* use base and extra for symbol >= match */
const count = new Uint16Array(MAXBITS + 1); //[MAXBITS+1]; /* number of codes of each length */ const count = new Uint16Array(MAXBITS + 1); //[MAXBITS+1]; /* number of codes of each length */
const offs = new Uint16Array(MAXBITS + 1); //[MAXBITS+1]; /* offsets in table for each length */ const offs = new Uint16Array(MAXBITS + 1); //[MAXBITS+1]; /* offsets in table for each length */
let extra = null; let extra = null;
let extra_index = 0;
let here_bits, here_op, here_val; let here_bits, here_op, here_val;
@ -211,19 +209,17 @@ const inflate_table = (type, lens, lens_index, codes, table, table_index, work,
// to avoid deopts in old v8 // to avoid deopts in old v8
if (type === CODES) { if (type === CODES) {
base = extra = work; /* dummy value--not used */ base = extra = work; /* dummy value--not used */
end = 19; match = 20;
} else if (type === LENS) { } else if (type === LENS) {
base = lbase; base = lbase;
base_index -= 257;
extra = lext; extra = lext;
extra_index -= 257; match = 257;
end = 256;
} else { /* DISTS */ } else { /* DISTS */
base = dbase; base = dbase;
extra = dext; extra = dext;
end = -1; match = 0;
} }
/* initialize opts for loop */ /* initialize opts for loop */
@ -247,13 +243,13 @@ const inflate_table = (type, lens, lens_index, codes, table, table_index, work,
for (;;) { for (;;) {
/* create table entry */ /* create table entry */
here_bits = len - drop; here_bits = len - drop;
if (work[sym] < end) { if (work[sym] + 1 < match) {
here_op = 0; here_op = 0;
here_val = work[sym]; here_val = work[sym];
} }
else if (work[sym] > end) { else if (work[sym] >= match) {
here_op = extra[extra_index + work[sym]]; here_op = extra[work[sym] - match];
here_val = base[base_index + work[sym]]; here_val = base[work[sym] - match];
} }
else { else {
here_op = 32 + 64; /* end of block */ here_op = 32 + 64; /* end of block */