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| // Copyright (c) 2012 Kuba Niegowski
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
'use strict';
var util = require('util'),
zlib = require('zlib'),
ChunkStream = require('./chunkstream'),
FilterAsync = require('./filter-async'),
Parser = require('./parser'),
bitmapper = require('./bitmapper');
var ParserAsync = module.exports = function(options) {
ChunkStream.call(this);
this._parser = new Parser(options, {
read: this.read.bind(this),
error: this._handleError.bind(this),
metadata: this.emit.bind(this, "metadata"),
gamma: this.emit.bind(this, "gamma"),
finished: this._finished.bind(this),
inflateData: this._inflateData.bind(this),
createData: this._createData.bind(this)
});
this._options = options;
this.writable = true;
this._parser.start();
};
util.inherits(ParserAsync, ChunkStream);
ParserAsync.prototype._handleError = function(err) {
this.emit('error', err);
this.writable = false;
this.destroy();
Iif (this._inflate && this._inflate.destroy) {
this._inflate.destroy();
}
this.errord = true;
};
ParserAsync.prototype._inflateData = function(data) {
if (!this._inflate) {
this._inflate = zlib.createInflate();
this._inflate.on('error', this.emit.bind(this, 'error'));
this._filter.on('complete', this._complete.bind(this));
this._inflate.pipe(this._filter);
}
this._inflate.write(data);
};
ParserAsync.prototype._createData = function(width, height, bpp, depth, interlace) {
this._bpp = bpp;
this._depth = depth;
this._interlace = interlace;
this._filter = new FilterAsync(
width, height,
bpp,
depth,
interlace,
this._options
);
};
ParserAsync.prototype._finished = function(data) {
Iif (this.errord) {
return;
}
if (!this._inflate) {
this.emit('error', 'No Inflate block');
} else {
// no more data to inflate
this._inflate.end();
}
this.destroySoon();
};
ParserAsync.prototype._complete = function(data, width, height) {
if (this.errord) {
return;
}
try {
data = bitmapper.dataToBitMap(data, width, height,
this._bpp,
this._depth,
this._interlace);
data = this._parser.reverseFiltered(data, this._depth, width, height);
}
catch(e) {
this._handleError();
return;
}
this.emit('parsed', data);
};
|