压缩

node_modules/node-zopfli/lib/zopfli.js

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+'use strict';
+
+var binary = require('node-pre-gyp');
+var path = require('path');
+var defaults = require('defaults');
+var binding_path = binary.find(path.join(__dirname, '../package.json'));
+var zopfli = require(binding_path);
+
+var util = require('util');
+var Transform = require('stream').Transform;
+
+/* Streaming part */
+var defaultOptions = {
+  verbose: false,
+  verbose_more: false,
+  numiterations: 15,
+  blocksplitting: true,
+  blocksplittinglast: false,
+  blocksplittingmax: 15
+};
+
+function Zopfli(format, options) {
+  this.first = true;
+  this.adler = 0x01;
+  this.crc = null;
+  this.format = format || 'deflate';
+  this.options = defaults(options, defaultOptions);
+  this.in = new Buffer(0);
+  Transform.prototype.constructor.apply(this, arguments);
+}
+
+util.inherits(Zopfli, Transform);
+
+Zopfli.prototype._transform = function(chunk, encoding, done) {
+  this.in = Buffer.concat([this.in, chunk]);
+  done();
+};
+
+Zopfli.prototype._flush = function(done) {
+  var transform = this;
+  var inBuffer = new Buffer(this.in);
+  zopfli.deflate(inBuffer, this.format, this.options, function(err, outbuf) {
+    if (err) {
+      done(err);
+    } else {
+      transform.push(outbuf);
+      done();
+    }
+  });
+};
+
+/* Stream */
+Zopfli.createGzip = function(options) {
+  return new Zopfli('gzip', options);
+};
+
+Zopfli.createZlib = function(options) {
+  return new Zopfli('zlib', options);
+};
+
+Zopfli.createDeflate = function(options) {
+  return new Zopfli('deflate', options);
+};
+
+/* Buffer */
+Zopfli.compress = function(buffer, type, options, callback) {
+  if (typeof callback === 'undefined' && typeof options === 'function') {
+    callback = options;
+    options = {};
+  }
+  options = options || {};
+  if (typeof callback === 'function') {
+    zopfli.deflate(buffer, type, options, callback);
+  } else {
+    return new Promise(function(resolve, reject) {
+      zopfli.deflate(buffer, type, options, function(err, data) {
+        if (err) {
+          reject(err);
+        } else {
+          resolve(data);
+        }
+      });
+    });
+  }
+};
+
+Zopfli.gzip = function(buffer, options, callback) {
+  return Zopfli.compress(buffer, 'gzip', options, callback);
+};
+
+Zopfli.zlib = function(buffer, options, callback) {
+  return Zopfli.compress(buffer, 'zlib', options, callback);
+};
+
+Zopfli.deflate = function(buffer, options, callback) {
+  return Zopfli.compress(buffer, 'deflate', options, callback);
+};
+
+/* Sync buffer */
+Zopfli.gzipSync = function(buffer, options) {
+  return zopfli.deflateSync(buffer, 'gzip', options);
+};
+
+Zopfli.zlibSync = function(buffer, options) {
+  return zopfli.deflateSync(buffer, 'zlib', options);
+};
+
+Zopfli.deflateSync = function(buffer, options) {
+  return zopfli.deflateSync(buffer, 'deflate', options);
+};
+
+module.exports = Zopfli;