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Fixed spped degradation: set arrays sizes & data types

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This commit is contained in:
Vitaly Puzrin 2014-02-14 02:51:38 +04:00
parent 8341b4cf5c
commit f4c1a86ed9
2 changed files with 22 additions and 7 deletions
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14
lib/zlib/deflate.js
View file

@ -171,7 +171,7 @@ function fill_window(s) {
zlib, so we don't care about this pathological case.) zlib, so we don't care about this pathological case.)
*/ */
n = s.hash_size; n = s.hash_size;
p = s.head[n]; p = n;
do { do {
m = s.head[--p]; m = s.head[--p];
s.head[p] = m >= wsize ? m - wsize : 0; s.head[p] = m >= wsize ? m - wsize : 0;
@ -179,7 +179,7 @@ function fill_window(s) {
n = wsize; n = wsize;
if (FASTEST) { if (FASTEST) {
p = s.prev[n]; p = n;
do { do {
m = s.head[--p]; m = s.head[--p];
s.head[p] = m >= wsize ? m - wsize : 0; s.head[p] = m >= wsize ? m - wsize : 0;
@ -499,13 +499,13 @@ function DeflateState() {
* is directly used as sliding window. * is directly used as sliding window.
*/ */
this.prev = Z_NULL; this.prev = null;
/* Link to older string with same hash index. To limit the size of this /* Link to older string with same hash index. To limit the size of this
* array to 64K, this link is maintained only for the last 32K strings. * array to 64K, this link is maintained only for the last 32K strings.
* An index in this array is thus a window index modulo 32K. * An index in this array is thus a window index modulo 32K.
*/ */
this.head = Z_NULL; this.head = null;
/* Heads of the hash chains or NIL. */ /* Heads of the hash chains or NIL. */
this.ins_h = 0; this.ins_h = 0;
@ -659,6 +659,12 @@ function deflateInit2(strm, level, method, windowBits, memLevel, strategy) {
s.strategy = strategy; s.strategy = strategy;
s.method = method; s.method = method;
// precreate & prefill head/prev arrays to optimize v8 types
s.head = new Array(s.hash_size);
s.prev = new Array(s.w_size);
utils.fill(s.head, 0);
utils.fill(s.prev, 0);
return deflateReset(strm); return deflateReset(strm);
} }

9
lib/zlib/utils.js
View file

@ -54,3 +54,12 @@ exports.arrayCreate = function(length) {
// Fallback to ordinary array // Fallback to ordinary array
return new Array(length); return new Array(length);
}; };
exports.fill = function (buf, val) {
var len = buf.length;
if (!len) { return;}
while (--len) { buf[len] = val}
}