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Added high-level deflator stubs

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Vitaly Puzrin 2014-02-03 18:12:27 +04:00
parent 3b20ccb154
commit dcc28b5b27
2 changed files with 62 additions and 9 deletions
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59
lib/deflate.js
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@ -1,7 +1,8 @@
'use strict'; 'use strict';
var zlib = require('zlib/deflate.js'); //var zlib_deflate = require('./zlib/deflate.js');
var utils = require('./zlib/utils');
/** /**
@ -10,7 +11,7 @@ var zlib = require('zlib/deflate.js');
* @param {Object} [options] zlib options * @param {Object} [options] zlib options
* @constructor * @constructor
*/ */
var Deflate = function(options) { var Deflate = function(/*options*/) {
}; };
@ -19,7 +20,7 @@ var Deflate = function(options) {
* Compresses the input data and fills output buffer with compressed data. * Compresses the input data and fills output buffer with compressed data.
* @return {Array|Uint8Array} compressed data * @return {Array|Uint8Array} compressed data
*/ */
Deflate.prototype.deflate = function(input) { Deflate.prototype.push = function(/*data_in*/) {
}; };
@ -31,11 +32,11 @@ Deflate.prototype.finish = function() {
}; };
Deflate.prototype.onData = function(output) { Deflate.prototype.onData = function(/*data_out*/) {
}; };
Deflate.prototype.onEnd = function(error) { Deflate.prototype.onEnd = function(/*err*/) {
}; };
@ -49,11 +50,51 @@ exports.Deflate = Deflate;
* @param [options] * @param [options]
* @returns {Array|Uint8Array} * @returns {Array|Uint8Array}
*/ */
exports.deflate = function(input, options) { function deflate(input, options) {
var result;
var chains = [];
var deflator = new Deflate(options);
}; deflator.onData = function(data_out) {
chains.push(data_out);
};
deflator.onEnd = function(error) {
var i, l, len, pos, chain;
if (error) { throw error; }
// calculate data length
len = 0;
for (i=0, l=chains.length; i<l; i++) {
len += chains[i].length;
}
// join chains
result = utils.arrayCreate(len);
pos = 0;
for (i=0, l=chains.length; i<l; i++) {
chain = chains[i];
len = chain.length;
utils.arraySet(result, chain, 0, len, pos);
pos += len;
}
};
deflator.push(input);
return result;
}
exports.deflateRaw = function(input, options) { function deflateRaw(input, options) {
options = options || {};
options.raw = true;
return deflate(input, options);
}
};
exports.Deflate = Deflate;
exports.deflate = deflate;
exports.deflateRaw = deflateRaw;

12
lib/zlib/utils.js Normal file
View file

@ -0,0 +1,12 @@
'use strict';
exports.arraySet = function(dest, src, src_offs, len, dest_offs) {
for(var i=0; i<len; i++) {
dest[dest_offs + i] = src[src_offs + i];
}
}
exports.arrayCreate = function(length) {
return new Array(length);
}