Code coverage report for lib\crc.js

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1
2326
 
 
1
 
4414
181010
 
4414
 
 
1
2078
 
 
 
1
 
1288
1288
205540
 
1288
 
 
 
 
1
 
1
256
256
2048
1024
 
1024
 
 
256
 
 
// 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 CrcCalculator = module.exports = function() {
    this._crc = -1;
};
 
CrcCalculator.prototype.write = function(data) {
 
    for (var i = 0; i < data.length; i++) {
        this._crc = crcTable[(this._crc ^ data[i]) & 0xff] ^ (this._crc >>> 8);
    }
    return true;
};
 
CrcCalculator.prototype.crc32 = function() {
    return this._crc ^ -1;
};
 
 
CrcCalculator.crc32 = function(buf) {
 
    var crc = -1;
    for (var i = 0; i < buf.length; i++) {
        crc = crcTable[(crc ^ buf[i]) & 0xff] ^ (crc >>> 8);
    }
    return crc ^ -1;
};
 
 
 
var crcTable = [];
 
for (var i = 0; i < 256; i++) {
    var c = i;
    for (var j = 0; j < 8; j++) {
        if (c & 1) {
            c = 0xedb88320 ^ (c >>> 1);
        } else {
            c = c >>> 1;
        }
    }
    crcTable[i] = c;
}