Initial commit

Author: devongovett

.gitignore

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+node_modules/
+.DS_Store

README.md

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+# browserify-zlib
+
+Emulates Node's [zlib](http://nodejs.org/api/zlib.html) module for [Browserify](http://browserify.org)
+using [pako](https://github.com/nodeca/pako). It uses the actual Node source code and passes the Node zlib tests
+by emulating the C++ binding that actually calls zlib.
+
+## License
+
+MIT

package.json

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+{
+  "name": "browserify-zlib",
+  "version": "0.1.0",
+  "description": "Full zlib module for browserify",
+  "main": "index.js",
+  "directories": {
+    "test": "test"
+  },
+  "dependencies": {
+    "pako": "~0.1.1"
+  },
+  "devDependencies": {
+    "tape": "^2.12.3",
+    "brfs": "^1.0.1"
+  },
+  "testling": {
+    "files": "test/*.js",
+    "browsers": [
+      "ie/6..latest",
+      "chrome/22..latest",
+      "firefox/16..latest",
+      "safari/latest",
+      "opera/11.0..latest",
+      "iphone/6",
+      "ipad/6",
+      "android-browser/latest"
+    ]
+  },
+  "browserify": {
+    "transform": [
+      "brfs"
+    ]
+  },
+  "scripts": {
+    "test": "node_modules/tape/bin/tape test/*.js"
+  },
+  "main": "src/index.js",
+  "author": "Devon Govett <[email protected]>",
+  "license": "MIT"
+}

src/binding.js

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+var msg = require('pako/lib/zlib/messages');
+var zstream = require('pako/lib/zlib/zstream');
+var zlib_deflate = require('pako/lib/zlib/deflate.js');
+var zlib_inflate = require('pako/lib/zlib/inflate.js');
+var constants = require('pako/lib/zlib/constants');
+
+for (var key in constants) {
+  exports[key] = constants[key];
+}
+
+// zlib modes
+exports.NONE = 0;
+exports.DEFLATE = 1;
+exports.INFLATE = 2;
+exports.GZIP = 3;
+exports.GUNZIP = 4;
+exports.DEFLATERAW = 5;
+exports.INFLATERAW = 6;
+exports.UNZIP = 7;
+
+function Zlib(mode) {
+  if (mode < exports.DEFLATE || mode > exports.UNZIP)
+    throw new TypeError("Bad argument");
+    
+  this.mode = mode;
+  this.init_done = false;
+  this.write_in_progress = false;
+  this.pending_close = false;
+  this.windowBits = 0;
+  this.level = 0;
+  this.memLevel = 0;
+  this.strategy = 0;
+  this.dictionary = null;
+}
+
+Zlib.prototype.init = function(windowBits, level, memLevel, strategy, dictionary) {
+  this.windowBits = windowBits;
+  this.level = level;
+  this.memLevel = memLevel;
+  this.strategy = strategy;
+  // dictionary not supported.
+  
+  if (this.mode === exports.GZIP || this.mode === exports.GUNZIP)
+    this.windowBits += 16;
+    
+  if (this.mode === exports.UNZIP)
+    this.windowBits += 32;
+    
+  if (this.mode === exports.DEFLATERAW || this.mode === exports.INFLATERAW)
+    this.windowBits = -this.windowBits;
+    
+  this.strm = new zstream();
+  
+  switch (this.mode) {
+    case exports.DEFLATE:
+    case exports.GZIP:
+    case exports.DEFLATERAW:
+      var status = zlib_deflate.deflateInit2(
+        this.strm,
+        this.level,
+        exports.Z_DEFLATED,
+        this.windowBits,
+        this.memLevel,
+        this.strategy
+      );
+      break;
+    case exports.INFLATE:
+    case exports.GUNZIP:
+    case exports.INFLATERAW:
+    case exports.UNZIP:
+      var status  = zlib_inflate.inflateInit2(
+        this.strm,
+        this.windowBits
+      );
+      break;
+    default:
+      throw new Error("Unknown mode " + this.mode);
+  }
+  
+  if (status !== exports.Z_OK) {
+    this._error(status);
+    return;
+  }
+  
+  this.write_in_progress = false;
+  this.init_done = true;
+};
+
+Zlib.prototype.params = function() {
+  throw new Error("deflateParams Not supported");
+};
+
+Zlib.prototype._writeCheck = function() {
+  if (!this.init_done)
+    throw new Error("write before init");
+    
+  if (this.mode === exports.NONE)
+    throw new Error("already finalized");
+    
+  if (this.write_in_progress)
+    throw new Error("write already in progress");
+    
+  if (this.pending_close)
+    throw new Error("close is pending");
+};
+
+Zlib.prototype.write = function(flush, input, in_off, in_len, out, out_off, out_len) {    
+  this._writeCheck();
+  this.write_in_progress = true;
+  
+  var self = this;
+  process.nextTick(function() {
+    self.write_in_progress = false;
+    var res = self._write(flush, input, in_off, in_len, out, out_off, out_len);
+    self.callback(res[0], res[1]);
+    
+    if (self.pending_close)
+      self.close();
+  });
+  
+  return this;
+};
+
+// set method for Node buffers, used by pako
+function bufferSet(data, offset) {
+  for (var i = 0; i < data.length; i++) {
+    this[offset + i] = data[i];
+  }
+}
+
+Zlib.prototype.writeSync = function(flush, input, in_off, in_len, out, out_off, out_len) {
+  this._writeCheck();
+  return this._write(flush, input, in_off, in_len, out, out_off, out_len);
+};
+
+Zlib.prototype._write = function(flush, input, in_off, in_len, out, out_off, out_len) {
+  this.write_in_progress = true;
+  
+  if (flush !== exports.Z_NO_FLUSH &&
+      flush !== exports.Z_PARTIAL_FLUSH &&
+      flush !== exports.Z_SYNC_FLUSH &&
+      flush !== exports.Z_FULL_FLUSH &&
+      flush !== exports.Z_FINISH &&
+      flush !== exports.Z_BLOCK) {
+    throw new Error("Invalid flush value");
+  }
+  
+  if (input == null) {
+    input = new Buffer(0);
+    in_len = 0;
+    in_off = 0;
+  }
+  
+  if (out._set)
+    out.set = out._set;
+  else
+    out.set = bufferSet;
+  
+  var strm = this.strm;
+  strm.avail_in = in_len;
+  strm.next_in = input;
+  strm.next_in_index = in_off;
+  strm.avail_out = out_len;
+  strm.next_out = out;
+  strm.next_out_index = out_off;
+  
+  switch (this.mode) {
+    case exports.DEFLATE:
+    case exports.GZIP:
+    case exports.DEFLATERAW:
+      var status = zlib_deflate.deflate(strm, flush);
+      break;
+    case exports.UNZIP:
+    case exports.INFLATE:
+    case exports.GUNZIP:
+    case exports.INFLATERAW:
+      var status = zlib_inflate.inflate(strm, flush);
+      break;
+    default:
+      throw new Error("Unknown mode " + this.mode);
+  }
+  
+  if (status !== exports.Z_STREAM_END && status !== exports.Z_OK) {
+    this._error(status);
+  }
+  
+  this.write_in_progress = false;
+  return [strm.avail_in, strm.avail_out];
+};
+
+Zlib.prototype.close = function() {
+  if (this.write_in_progress) {
+    this.pending_close = true;
+    return;
+  }
+  
+  this.pending_close = false;
+  
+  if (this.mode === exports.DEFLATE || this.mode === exports.GZIP || this.mode === exports.DEFLATERAW) {
+    zlib_deflate.deflateEnd(this.strm);
+  } else {
+    zlib_inflate.inflateEnd(this.strm);
+  }
+  
+  this.mode = exports.NONE;
+};
+
+Zlib.prototype.reset = function() {
+  switch (this.mode) {
+    case DEFLATE:
+    case DEFLATERAW:
+      var status = zlib_deflate.deflateReset(this.strm);
+      break;
+    case INFLATE:
+    case INFLATERAW:
+      var status = zlib_inflate.inflateReset(this.strm);
+      break;
+  }
+  
+  if (status !== exports.Z_OK) {
+    this._error(status);
+  }
+};
+
+Zlib.prototype._error = function(status) {
+  this.onerror(msg[status] + ': ' + this.strm.msg, status);
+  
+  this.write_in_progress = false;
+  if (this.pending_close)
+    this.close();
+};
+
+exports.Zlib = Zlib;