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compress.js
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compress.js
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var sys = require('sys');
var events = require('events');
var bindings = require('compress-bindings');
function removed(str) {
return function() {
throw new Error(str);
}
}
function fallbackConstructor(str) {
return function() {
throw new Error(str);
}
}
var Gzip = bindings.Gzip ||
fallbackConstructor('Library built without gzip support.');
Gzip.prototype.init = removed('Use constructor to create new gzip object.');
Gzip.prototype.deflate = removed('Use write() instead.');
Gzip.prototype.end = removed('Use close() instead.');
var Gunzip = bindings.Gunzip ||
fallbackConstructor('Library built without gzip support.');
Gunzip.prototype.init = removed('Use constructor to create new gunzip object.');
Gunzip.prototype.inflate = removed('Use write() instead.');
Gunzip.prototype.end = removed('Use close() instead.')
var Bzip = bindings.Bzip ||
fallbackConstructor('Library built without bzip support.');
Bzip.prototype.init = removed('Use constructor to create new bzip object.');
Bzip.prototype.deflate = removed('Use write() instead.');
Bzip.prototype.end = removed('Use close() instead.');
var Bunzip = bindings.Bunzip ||
fallbackConstructor('Library built without bzip support.');
Bunzip.prototype.init = removed('Use constructor to create new bunzip object.');
Bunzip.prototype.inflate = removed('Use write() instead.');
Bunzip.prototype.end = removed('Use close() instead.')
// === CommonStream ===
// Common base for compress/decompress streams.
function CommonStream() {
events.EventEmitter.call(this);
this.impl_ = null;
this.dataQueue_ = [];
this.paused_ = false;
this.outputEncoding_ = null;
}
sys.inherits(CommonStream, events.EventEmitter);
CommonStream.prototype.pause = function() {
this.paused_ = true;
};
CommonStream.prototype.resume = function() {
this.paused_ = false;
this.emitData_();
};
CommonStream.prototype.destroy = function() {
this.impl_.destroy();
};
CommonStream.prototype.emitData_ = function(data) {
if (this.paused_) {
this.dataQueue_.push(data);
} else {
for (var i = 0; i < this.dataQueue_.length; ++i) {
self.emit('data', this.dataQueue_[i]);
}
self.dataQueue_.length = 0;
if (data != null) {
self.emit('data', data);
}
}
};
CommonStream.prototype.emitEvent_ = function(err, data, fin) {
if (err) {
this.emit('error', err);
return;
}
if (this.outputEncoding_ != 'binary') {
var str = data;
var len = Buffer.byteLength(str, 'binary');
data = new Buffer(len);
data.write(str, 'binary', 0);
if (this.outputEncoding_ != null) {
data = data.toString(this.outputEncoding_, 0, data.length);
}
}
this.emitData_(data);
if (fin) {
this.emit('end');
}
};
// === CompressStream ===
// Common base for compression streams.
function CompressStream() {
CommonStream.call(this);
this.encoding_ = null;
}
sys.inherits(CompressStream, CommonStream);
CompressStream.prototype.setEncoding = function(enc) {
if (enc != 'binary') {
throw new Error('CompressStream emits either Buffer or binary string.');
}
this.outputString_ = true;
};
CompressStream.prototype.setInputEncoding = function(enc) {
this.encoding_ = enc;
};
CompressStream.prototype.write = function(buffer, opt_encoding) {
var self = this;
opt_encoding = opt_encoding || this.encoding_;
if (opt_encoding != null) {
// Not buffer input.
var str = buffer;
buffer = new Buffer(Buffer.byteLength(str, opt_encoding));
buffer.write(str, opt_encoding, 0);
}
this.impl_.write(buffer, function(err, data) {
self.emitEvent_(err, data);
});
};
CompressStream.prototype.close = function() {
var self = this;
this.impl_.close(function (err, data) {
self.emitEvent_(err, data, true);
});
};
// === DecompressStream ===
// Common base for decompress streams.
function DecompressStream() {
CommonStream.call(this);
}
sys.inherits(DecompressStream, CommonStream);
DecompressStream.prototype.setEncoding = function(enc) {
if (enc == 'utf8' || enc == 'ascii') {
this.outputEncoding_ = enc;
} else {
this.outputEncoding_ = 'binary';
}
};
DecompressStream.prototype.write = function(buffer) {
var self = this;
this.impl_.write(buffer, function(err, data) {
self.emitEvent_(err, data);
});
};
DecompressStream.prototype.close = function() {
var self = this;
this.impl_.close(function (err, data) {
self.emitEvent_(err, data, true);
});
};
// === GzipStream ===
function GzipStream() {
CompressStream.call(this);
this.impl_ = new Gzip();
}
sys.inherits(GzipStream, CompressStream);
// === GunzipStream ===
function GunzipStream() {
DecompressStream.call(this);
this.impl_ = new GunzipStream();
}
sys.inherits(GunzipStream, DecompressStream);
// === BzipStream ===
function BzipStream() {
CompressStream.call(this);
this.impl_ = new Bzip();
}
sys.inherits(BzipStream, CompressStream);
// === BunzipStream ===
function BunzipStream() {
DecompressStream.call(this);
this.impl_ = new BunzipStream();
}
sys.inherits(BunzipStream, DecompressStream);