yahoo/pngjs-image

// Copyright 2015 Yahoo! Inc.
// Copyrights licensed under the Mit License. See the accompanying LICENSE file for terms.

var fs = require('fs');
var path = require('path');

var Decoder = require('../../index').Decoder;
var Encoder = require('../../index').Encoder;

before(function () {

    this.resource = function (groups, file) {

        groups = [].concat(groups);

        var completePath = path.join(__dirname, 'PngSuite');

        groups.forEach(function (group) {
            completePath = path.join(completePath, group);
        });

        completePath = path.join(completePath, file);

        return completePath;
    };

    this.decode = function (path, options) {

        options = options || {};
        options.strict = true;

        this.blob = fs.readFileSync(path);

        this.decoder = new Decoder();

        this.image = this.decoder.decode(this.blob, options);
        this.data = this.decoder.getChunkData();
        this.chunks = this.decoder.getChunks();
    };

    this.encode = function (path, buffer, width, height, options) {

        this.encoder = new Encoder();

        this.encodedBlob = this.encoder.encode(buffer, width, height, options);

        fs.writeFileSync(path, this.encodedBlob);
    };

    this.compareToFile = function (buffer, path) {

        var compareToBuffer = fs.readFileSync(path);

        this.compareBuffer(buffer, compareToBuffer);
    };

    this.compareBuffer = function (buffer1, buffer2) {

        if (buffer1.length != buffer2.length) {
            throw new Error('Buffer have different sizes.');
        }

        for(var i = 0; i < buffer2.length; i++) {
            if (buffer2[i] != buffer1[i]) {
                throw new Error('Buffers are different.');
            }
        }
    }
});