# Code coverage report for lib\parser-async.js

## Statements: 90.7% (39 / 43) Branches: 83.33% (10 / 12) Functions: 100% (6 / 6) Lines: 90.7% (39 / 43) Ignored: none

All files » lib/ » parser-async.js

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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);
    };