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Store tables data in compact form

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This commit is contained in:
Vitaly Puzrin 2014-03-12 22:50:55 +04:00
parent 63ffa3baae
commit f09d27bc1e
3 changed files with 43 additions and 26 deletions
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20
lib/zlib/inflate.js
View file

@ -115,27 +115,23 @@ Code.prototype.clone = function() {
};
function CodeTable(length) {
this.op = length ? utils.arrayCreate(length) : null;
this.val = length ? utils.array16Create(length): null;
this.bits = length ? utils.arrayCreate(length) : null;
// Packed data: [ bits, op, value], 1byte + 1byte +2 bytes
this.data = utils.array32Create(length);
}
CodeTable.prototype.fill = function(idx, code) {
code.bits = this.bits[idx];
code.op = this.op[idx];
code.val = this.val[idx];
var packed = this.data[idx];
code.bits = packed >>> 24;
code.op = (packed >>> 16) & 0xff;
code.val = packed & 0xffff;
};
CodeTable.prototype.set = function(idx, code) {
this.bits[idx] = code.bits;
this.op[idx] = code.op;
this.val[idx] = code.val;
this.data[idx] = (code.bits << 24) | (code.op << 16) | code.val;
};
CodeTable.prototype.copy = function(table) {
utils.arraySet(this.bits,table.bits,0,table.bits.length,0);
utils.arraySet(this.op,table.op,0,table.op.length,0);
utils.arraySet(this.val,table.val,0,table.val.length,0);
utils.arraySet(this.data,table.data,0,table.data.length,0);
};
function InflateState() {

28
lib/zlib/inftrees.js
View file

@ -116,13 +116,17 @@ module.exports = function inflate_table(opts)
root = max;
}
if (max === 0) { /* no symbols to code at all */
table.op[opts.table_index] = 64; //here.op = (var char)64; /* invalid code marker */
table.bits[opts.table_index] = 1; //here.bits = (var char)1;
table.val[opts.table_index++] = 0; //here.val = (var short)0;
//table.op[opts.table_index] = 64; //here.op = (var char)64; /* invalid code marker */
//table.bits[opts.table_index] = 1; //here.bits = (var char)1;
//table.val[opts.table_index++] = 0; //here.val = (var short)0;
table.data[opts.table_index++] = (1 << 24) | (64 << 16) | 0;
//table.op[opts.table_index] = 64;
//table.bits[opts.table_index] = 1;
//table.val[opts.table_index++] = 0;
table.data[opts.table_index++] = (1 << 24) | (64 << 16) | 0;
table.op[opts.table_index] = 64;
table.bits[opts.table_index] = 1;
table.val[opts.table_index++] = 0;
opts.bits = 1;
return 0; /* no symbols, but wait for decoding to report error */
}
@ -302,9 +306,10 @@ module.exports = function inflate_table(opts)
/* point entry in root table to sub-table */
low = huff & mask;
table.op[low] = curr;
/*table.op[low] = curr;
table.bits[low] = root;
table.val[low] = next - opts.table_index;
table.val[low] = next - opts.table_index;*/
table.data[low] = (root << 24) | (curr << 16) | (next - opts.table_index);
}
}
@ -312,9 +317,10 @@ module.exports = function inflate_table(opts)
at most one remaining entry, since if the code is incomplete, the
maximum code length that was allowed to get this far is one bit) */
if (huff !== 0) {
table.op[next + huff] = 64; /* invalid code marker */
table.bits[next + huff] = len - drop;
table.val[next + huff] = 0;
//table.op[next + huff] = 64; /* invalid code marker */
//table.bits[next + huff] = len - drop;
//table.val[next + huff] = 0;
table.data[next + huff] = ((len - drop) << 24) | (64 << 16) | 0;
}
/* set return parameters */

21
lib/zlib/utils.js
View file

@ -62,22 +62,37 @@ exports.arraySet = function (dest, src, src_offs, len, dest_offs) {
exports.arrayCreate = function (length) {
if (typedOk()) {
return new Uint8Array(length);
}
// Fallback to ordinary array
return new Array(length);
};
exports.array16Create = function (length) {
if (typedOk()) {
return new Uint16Array(length);
}
// Fallback to ordinary array
return new Array(length);
};
exports.array16Create = function (length) {
if (typedOk()) {
return new Uint16Array(length);
}
// Fallback to ordinary array
return new Array(length);
};
// (!) use signed ints for 32 bits, to avoid boxing
exports.array32Create = function (length) {
if (typedOk()) {
return new Int32Array(length);
}
// Fallback to ordinary array
return new Array(length);
};