├── samples
    ├── ts-sample.ts
    └── js-sample.js
├── dist
    ├── crcUtil.d.ts
    ├── crc.d.ts
    ├── crcUtil.js
    ├── crcUtil.js.map
    ├── crc.js.map
    └── crc.js
├── tsconfig.json
├── .gitignore
├── src
    ├── crcUtil.ts
    └── crc.ts
├── package.json
└── readme.md


/samples/ts-sample.ts:
--------------------------------------------------------------------------------
1 | import {CRC} from '../src/crc'
2 | 
3 | var crc = new CRC("CRC16", 16, 0x8005, 0x0000, 0x0000, false, false);
4 | 
5 | var computed_crc = crc.compute(Buffer.from("Hello world!", "ascii"))
6 | 
7 | console.log("Hello wolrd!: ", computed_crc);


--------------------------------------------------------------------------------
/samples/js-sample.js:
--------------------------------------------------------------------------------
1 | const CRC = require('crc-full').CRC;
2 | 
3 | var crc = new CRC("CRC16", 16, 0x8005, 0x0000, 0x0000, false, false);
4 | 
5 | var computed_crc = crc.compute(Buffer.from("Hello world!", "ascii"))
6 | 
7 | console.log("Hello wolrd!: ", computed_crc);


--------------------------------------------------------------------------------
/dist/crcUtil.d.ts:
--------------------------------------------------------------------------------
1 | declare class CrcUtil {
2 |     static Reflect8(val: number): number;
3 |     static Reflect16(val: number): number;
4 |     static Reflect32(val: number): number;
5 |     static ReflectGeneric(val: number, width: number): number;
6 | }
7 | export default CrcUtil;
8 | 


--------------------------------------------------------------------------------
/tsconfig.json:
--------------------------------------------------------------------------------
 1 | {
 2 |     "compilerOptions": {
 3 |         "target": "es5",
 4 |         "module": "commonjs",
 5 |         "declaration": true,
 6 |         "sourceMap": true,
 7 |         "removeComments": true,
 8 |         "noImplicitAny": true,
 9 |         "outDir": "./dist",
10 |         "noImplicitThis": true,
11 |         "lib": ["es5", "es6"]
12 |     },
13 |     "include": [
14 |         "./src/**/*.ts"
15 |     ]
16 | }


--------------------------------------------------------------------------------
/dist/crc.d.ts:
--------------------------------------------------------------------------------
 1 | /// <reference types="node" />
 2 | export declare class CRC {
 3 |     private _width;
 4 |     private _name;
 5 |     private _polynomial;
 6 |     private _initialVal;
 7 |     private _finalXorVal;
 8 |     private _inputReflected;
 9 |     private _resultReflected;
10 |     private static _list;
11 |     private _crcTable;
12 |     private _castMask;
13 |     private _msbMask;
14 |     width: number;
15 |     name: string;
16 |     polynomial: number;
17 |     initial: number;
18 |     finalXor: number;
19 |     inputReflected: boolean;
20 |     resultReflected: boolean;
21 |     constructor(name: string, width: number, polynomial: number, initial: number, finalXor: number, inputReflected: boolean, resultReflected: boolean);
22 |     static readonly defaults: CRC[];
23 |     makeCrcTable(): void;
24 |     makeCrcTableReversed(): void;
25 |     compute(bytes: number[] | Buffer): number;
26 |     computeBuffer(bytes: number[] | Buffer): Buffer;
27 |     readonly table: number[];
28 |     static default(name: string): CRC | undefined;
29 | }
30 | 


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
 1 | # Logs
 2 | logs
 3 | *.log
 4 | npm-debug.log*
 5 | yarn-debug.log*
 6 | yarn-error.log*
 7 | 
 8 | # Runtime data
 9 | pids
10 | *.pid
11 | *.seed
12 | *.pid.lock
13 | 
14 | # Directory for instrumented libs generated by jscoverage/JSCover
15 | lib-cov
16 | 
17 | # Coverage directory used by tools like istanbul
18 | coverage
19 | 
20 | # nyc test coverage
21 | .nyc_output
22 | 
23 | # Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
24 | .grunt
25 | 
26 | # Bower dependency directory (https://bower.io/)
27 | bower_components
28 | 
29 | # node-waf configuration
30 | .lock-wscript
31 | 
32 | # Compiled binary addons (https://nodejs.org/api/addons.html)
33 | build/Release
34 | 
35 | # Dependency directories
36 | node_modules/
37 | jspm_packages/
38 | 
39 | # Typescript v1 declaration files
40 | typings/
41 | 
42 | # Optional npm cache directory
43 | .npm
44 | 
45 | # Optional eslint cache
46 | .eslintcache
47 | 
48 | # Optional REPL history
49 | .node_repl_history
50 | 
51 | # Output of 'npm pack'
52 | *.tgz
53 | 
54 | # Yarn Integrity file
55 | .yarn-integrity
56 | 
57 | # dotenv environment variables file
58 | .env


--------------------------------------------------------------------------------
/src/crcUtil.ts:
--------------------------------------------------------------------------------
 1 | class CrcUtil {
 2 | 
 3 |     public static Reflect8(val : number) {
 4 |         var resByte = 0;
 5 | 
 6 |         for (var i = 0; i < 8; i++) {
 7 |             if ((val & (1 << i)) != 0) {
 8 |                 resByte |= ((1 << (7 - i)) & 0xFF);
 9 |             }
10 |         }
11 |         return resByte;
12 |     }
13 | 
14 |     public static Reflect16(val:number) {
15 |         var resByte = 0;
16 | 
17 |         for (var i = 0; i < 16; i++) {
18 |             if ((val & (1 << i)) != 0) {
19 |                 resByte |= ((1 << (15 - i)) & 0xFFFF);
20 |             }
21 |         }
22 | 
23 |         return resByte;
24 |     }
25 | 
26 |     public static Reflect32(val : number) {
27 |         var resByte = 0;
28 | 
29 |         for (var i = 0; i < 32; i++) {
30 |             if ((val & (1 << i)) != 0) {
31 |                 resByte |= ((1 << (31 - i)) & 0xFFFFFFFF);
32 |             }
33 |         }
34 | 
35 |         return resByte;
36 |     }
37 | 
38 |     public static ReflectGeneric(val : number, width : number) {
39 |         var resByte = 0;
40 |         for (var i = 0; i < width; i++) {
41 |             if ((val & (1 << i)) != 0) {
42 |                 resByte |= (1 << ((width - 1) - i));
43 |             }
44 |         }
45 |         return resByte;
46 |     }
47 | }
48 | 
49 | export default CrcUtil;


--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |     "name": "crc-full",
 3 |     "version": "1.1.0",
 4 |     "description": "CRC generator for node js",
 5 |     "main": "dist/crc.js",
 6 |     "scripts": {
 7 |         "prepublish": "tsc",
 8 |         "test": "echo \"Error: no test specified\" && exit 1"
 9 |     },
10 |     "keywords": [
11 |         "crc",
12 |         "crc8",
13 |         "crc16",
14 |         "crc32",
15 |         "polynomial"
16 |     ],
17 |     "directories": {
18 |         "example": "samples"
19 |     },
20 |     "displayName": "crc-full",
21 |     "maintainers": [{
22 |         "name": "Giuseppe Riolo",
23 |         "email": "riolo.giuseppe@gmail.com"
24 |     }],
25 |     "author": {
26 |         "name": "Giuseppe Riolo",
27 |         "email": "riolo.giuseppe@gmail.com",
28 |         "url": "https://github.com/RioloGiuseppe"
29 |     },
30 |     "license": "MIT",
31 |     "typings": "./dist/crc.d.ts",
32 |     "repository": {
33 |         "type": "git",
34 |         "url": "git+https://github.com/RioloGiuseppe/crc-full.git"
35 |     },
36 |     "bugs": {
37 |         "url": "https://github.com/RioloGiuseppe/crc-full/issues"
38 |     },
39 |     "homepage": "https://github.com/RioloGiuseppe/crc-full#readme",
40 |     "readme": "https://github.com/RioloGiuseppe/crc-full#readme",
41 |     "devDependencies": {
42 |         "@types/node": "^8.0.31"
43 |     }
44 | }


--------------------------------------------------------------------------------
/dist/crcUtil.js:
--------------------------------------------------------------------------------
 1 | "use strict";
 2 | Object.defineProperty(exports, "__esModule", { value: true });
 3 | var CrcUtil = (function () {
 4 |     function CrcUtil() {
 5 |     }
 6 |     CrcUtil.Reflect8 = function (val) {
 7 |         var resByte = 0;
 8 |         for (var i = 0; i < 8; i++) {
 9 |             if ((val & (1 << i)) != 0) {
10 |                 resByte |= ((1 << (7 - i)) & 0xFF);
11 |             }
12 |         }
13 |         return resByte;
14 |     };
15 |     CrcUtil.Reflect16 = function (val) {
16 |         var resByte = 0;
17 |         for (var i = 0; i < 16; i++) {
18 |             if ((val & (1 << i)) != 0) {
19 |                 resByte |= ((1 << (15 - i)) & 0xFFFF);
20 |             }
21 |         }
22 |         return resByte;
23 |     };
24 |     CrcUtil.Reflect32 = function (val) {
25 |         var resByte = 0;
26 |         for (var i = 0; i < 32; i++) {
27 |             if ((val & (1 << i)) != 0) {
28 |                 resByte |= ((1 << (31 - i)) & 0xFFFFFFFF);
29 |             }
30 |         }
31 |         return resByte;
32 |     };
33 |     CrcUtil.ReflectGeneric = function (val, width) {
34 |         var resByte = 0;
35 |         for (var i = 0; i < width; i++) {
36 |             if ((val & (1 << i)) != 0) {
37 |                 resByte |= (1 << ((width - 1) - i));
38 |             }
39 |         }
40 |         return resByte;
41 |     };
42 |     return CrcUtil;
43 | }());
44 | exports.default = CrcUtil;
45 | //# sourceMappingURL=crcUtil.js.map


--------------------------------------------------------------------------------
/dist/crcUtil.js.map:
--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
/readme.md:
--------------------------------------------------------------------------------
  1 | # crc-full
  2 | 
  3 | ![Support Node of LTS](https://img.shields.io/badge/node-LTS-brightgreen.svg?style=plastic) ![npm version](https://img.shields.io/badge/npm-3.5.0-brightgreen.svg?style=plastic) ![Build passing](https://img.shields.io/badge/build-passing-brightgreen.svg?style=plastic) ![dependencies typescript](https://img.shields.io/badge/dependencies-typescript-blue.svg?style=plastic) ![License mit](https://img.shields.io/badge/license-MIT-blue.svg?style=plastic) 
  4 | 
  5 | ---
  6 | 
  7 | # Description
  8 | The crc-full module is used to calculate any kind of CRC setting parameters such as length, polynomial and others. It's completely written in typescript for node js.
  9 | 
 10 | ## How to use
 11 | 
 12 | Use is very simple. Just add the module to project.
 13 | 
 14 | > **Install dependencies:**  
 15 | > The only one dependency is typescript compiler
 16 | > ```sh
 17 | > npm install -g typescript
 18 | > ```
 19 | 
 20 | ### Import in node js
 21 | After *typescript* is installed, simple run:
 22 | ```sh
 23 | npm install crc-full
 24 | ```
 25 | 
 26 | ### Use in your project
 27 | 
 28 | First of all import the module in your project files, then create an instance of the class whith all parameters of the CRC algorithm you need.
 29 | After the instance is create you can compute the CRC of your data passing an array of byte or simply a buffer object.
 30 | 
 31 | For typescript use:
 32 | ```ts
 33 | import {CRC} from 'crc-full'
 34 | ...
 35 | let crc =  new CRC("CRC16", 16, 0x8005, 0x0000, 0x0000, false, false);
 36 | crc.compute([0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64, 0x21]);
 37 | let computed_crc = crc.compute(Buffer.from("Hello world!","ascii"))
 38 | ```
 39 | For javascript use:
 40 | ```js
 41 | const CRC = require('crc-full').CRC;
 42 | var crc = new CRC("CRC16", 16, 0x8005, 0x0000, 0x0000, false, false);
 43 | crc.compute([0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64, 0x21]);
 44 | var computed_crc = crc.compute(Buffer.from("Hello world!", "ascii"))
 45 | ```
 46 | 
 47 | Where the parameters in the constructor are:
 48 | - Length: the Length of CRC in bit (8,16,32)
 49 | - Name: friendly name for the configuration
 50 | - Polinomial: the polinomial used to compute CRC
 51 | - InitialValue: initial value of CRC
 52 | - FinalXorValue: final value of CRC
 53 | - InputReflected: boolen that indicate if need to reflect input
 54 | - OutputReflected: boolen that indicate if need to reflect input
 55 | 
 56 | ### Presets
 57 | 
 58 | Invoking the static getter *defaults* is possible to use the internal preconfigurated CRC algorithms. An array of instantiated object is returned back
 59 | 
 60 | The algorithms are:
 61 | 
 62 | | Length | Name | Polinomial | Initial value | Final value | Input reflected | Output reflected |
 63 | |:------:|------|:----------:|:-------------:|:-----------:|:---------------:|:----------------:|
 64 | |8|CRC8|0x07|0x00|0x00|false|false)|
 65 | |8|CRC8_SAE_J1850|0x1D|0xFF|0xFF|false|false)|
 66 | |8|CRC8_SAE_J1850_ZERO|0x1D|0x00|0x00|false|false)|
 67 | |8|CRC8_8H2F|0x2F|0xFF|0xFF|false|false)|
 68 | |8|CRC8_CDMA2000|0x9B|0xFF|0x00|false|false)|
 69 | |8|CRC8_DARC|0x39|0x00|0x00|true|true)|
 70 | |8|CRC8_DVB_S2|0xD5|0x00|0x00|false|false)|
 71 | |8|CRC8_EBU|0x1D|0xFF|0x00|true|true)|
 72 | |8|CRC8_ICODE|0x1D|0xFD|0x00|false|false)|
 73 | |8|CRC8_ITU|0x07|0x00|0x55|false|false|
 74 | |8|CRC8_MAXIM|0x31|0x00|0x00|true|true|
 75 | |8|CRC8_ROHC|0x07|0xFF|0x00|true|true|
 76 | |8|CRC8_WCDMA|0x9B|0x00|0x00|true|true|
 77 | |16|CRC16_CCIT_ZERO|0x1021|0x0000|0x0000|false|false|
 78 | |16|CRC16_ARC|0x8005|0x0000|0x0000|true|true|
 79 | |16|CRC16_AUG_CCITT|0x1021|0x1D0F|0x0000|false|false|
 80 | |16|CRC16_BUYPASS|0x8005|0x0000|0x0000|false|false|
 81 | |16|CRC16_CCITT_FALSE|0x1021|0xFFFF|0x0000|false|false|
 82 | |16|CRC16_CDMA2000|0xC867|0xFFFF|0x0000|false|false|
 83 | |16|CRC16_DDS_110|0x8005|0x800D|0x0000|false|false|
 84 | |16|CRC16_DECT_R|0x0589|0x0000|0x0001|false|false|
 85 | |16|CRC16_DECT_X|0x0589|0x0000|0x0000|false|false|
 86 | |16|CRC16_DNP|0x3D65|0x0000|0xFFFF|true|true|
 87 | |16|CRC16_EN_13757|0x3D65|0x0000|0xFFFF|false|false|
 88 | |16|CRC16_GENIBUS|0x1021|0xFFFF|0xFFFF|false|false|
 89 | |16|CRC16_MAXIM|0x8005|0x0000|0xFFFF|true|true|
 90 | |16|CRC16_MCRF4XX|0x1021|0xFFFF|0x0000|true|true|
 91 | |16|CRC16_RIELLO|0x1021|0xB2AA|0x0000|true|true|
 92 | |16|CRC16_T10_DIF|0x8BB7|0x0000|0x0000|false|false|
 93 | |16|CRC16_TELEDISK|0xA097|0x0000|0x0000|false|false|
 94 | |16|CRC16_TMS37157|0x1021|0x89EC|0x0000|true|true|
 95 | |16|CRC16_USB|0x8005|0xFFFF|0xFFFF|true|true|
 96 | |16|CRC16_A|0x1021|0xC6C6|0x0000|true|true|
 97 | |16|CRC16_KERMIT|0x1021|0x0000|0x0000|true|true|
 98 | |16|CRC16_MODBUS|0x8005|0xFFFF|0x0000|true|true|
 99 | |16|CRC16_X_25|0x1021|0xFFFF|0xFFFF|true|true|
100 | |16|CRC16_XMODEM|0x1021|0x0000|0x0000|false|false|
101 | |32|CRC32|0x04C11DB7|0xFFFFFFFF|0xFFFFFFFF|true|true|
102 | |32|CRC32_BZIP2|0x04C11DB7|0xFFFFFFFF|0xFFFFFFFF|false|false|
103 | |32|CRC32_C|0x1EDC6F41|0xFFFFFFFF|0xFFFFFFFF|true|true|
104 | |32|CRC32_D|0xA833982B|0xFFFFFFFF|0xFFFFFFFF|true|true|
105 | |32|CRC32_MPEG2|0x04C11DB7|0xFFFFFFFF|0x00000000|false|false|
106 | |32|CRC32_POSIX|0x04C11DB7|0x00000000|0xFFFFFFFF|false|false|
107 | |32|CRC32_Q|0x814141AB|0x00000000|0x00000000|false|false|
108 | |32|CRC32_JAMCRC|0x04C11DB7|0xFFFFFFFF|0x00000000|true|true|
109 | |32|CRC32_XFER|0x000000AF|0x00000000|0x00000000|false|false|
110 | 
111 | Is possible to use one of above CRC preset using the method default(name) where parameter _name_ is the name of chosen preset.
112 | 
113 | Typescript users can use:
114 | 
115 | ```ts
116 | import {CRC} from 'crc-full'
117 | let crc = CRC.default("CRC16_CCIT_ZERO");
118 | let computed_crc = crc.compute(Buffer.from("Hello world!","ascii"))
119 | ```
120 | Typescript users can use:
121 | 
122 | ```ts
123 | const CRC = require('crc-full').CRC;
124 | var crc = CRC.default("CRC16_CCIT_ZERO");
125 | var computed_crc = crc.compute(Buffer.from("Hello world!","ascii"))
126 | ```
127 | 
128 | ### Advanced
129 | 
130 | The module also support advanced methods to calculate CRC tables and export them as byte arrays:
131 | 
132 | ```js
133 | ...
134 | crc.makeCrcTable();
135 | crc.makeCrcTableReversed();
136 | var table = crc.table;
137 | ...
138 | ```
139 | 
140 | ### Notes
141 | 
142 | The method `compute` take a byte array (or Buffer) as input and returns a number.  
143 | If you need to convert a string you have to pass it as a byte array.  
144 | If you need to read the CRC result in hex format string use `.toString(16)`


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/dist/crc.js.map:
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1 | 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/src/crc.ts:
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  1 | import CrcUtil from './crcUtil';
  2 | 
  3 | export class CRC {
  4 | 
  5 |     private _width: number;
  6 |     private _name: string;
  7 |     private _polynomial: number;
  8 |     private _initialVal: number;
  9 |     private _finalXorVal: number;
 10 |     private _inputReflected: boolean;
 11 |     private _resultReflected: boolean;
 12 |     private static _list: CRC[];
 13 | 
 14 |     private _crcTable: number[];
 15 |     private _castMask: number;
 16 |     private _msbMask: number
 17 | 
 18 |     public get width(): number { return this._width; }
 19 |     public set width(v: number) {
 20 |         this._width = v;
 21 |         switch (v) {
 22 |             case 8:
 23 |                 this._castMask = 0xFF;
 24 |                 break;
 25 |             case 16:
 26 |                 this._castMask = 0xFFFF;
 27 |                 break;
 28 |             case 32:
 29 |                 this._castMask = 0xFFFFFFFF;
 30 |                 break;
 31 |             default:
 32 |                 throw "Invalid CRC width";
 33 |         }
 34 |         this._msbMask = 0x01 << (v - 1)
 35 |     }
 36 | 
 37 |     public get name(): string { return this._name; }
 38 |     public set name(v: string) {
 39 |         this._name = v;
 40 |     }
 41 | 
 42 |     public get polynomial(): number { return this._polynomial; }
 43 |     public set polynomial(v: number) {
 44 |         this._polynomial = v;
 45 |     }
 46 | 
 47 |     public get initial(): number { return this._initialVal; }
 48 |     public set initial(v: number) {
 49 |         this._initialVal = v;
 50 |     }
 51 | 
 52 |     public get finalXor(): number { return this._finalXorVal; }
 53 |     public set finalXor(v: number) {
 54 |         this._finalXorVal = v;
 55 |     }
 56 | 
 57 |     public get inputReflected(): boolean { return this._inputReflected; }
 58 |     public set inputReflected(v: boolean) {
 59 |         this._inputReflected = v;
 60 |     }
 61 | 
 62 |     public get resultReflected(): boolean { return this._resultReflected; }
 63 |     public set resultReflected(v: boolean) {
 64 |         this._resultReflected = v;
 65 |     }
 66 | 
 67 |     constructor(name: string, width: number, polynomial: number, initial: number, finalXor: number, inputReflected: boolean, resultReflected: boolean) {
 68 |         this.width = width;
 69 |         this.name = name;
 70 |         this.polynomial = polynomial;
 71 |         this.initial = initial;
 72 |         this.finalXor = finalXor;
 73 |         this.inputReflected = inputReflected;
 74 |         this.resultReflected = resultReflected;
 75 |     }
 76 | 
 77 |     public static get defaults(): CRC[] {
 78 |         if (!this._list) {
 79 |             this._list = [
 80 |                 new CRC("CRC8", 8, 0x07, 0x00, 0x00, false, false),
 81 |                 new CRC("CRC8_SAE_J1850", 8, 0x1D, 0xFF, 0xFF, false, false),
 82 |                 new CRC("CRC8_SAE_J1850_ZERO", 8, 0x1D, 0x00, 0x00, false, false),
 83 |                 new CRC("CRC8_8H2F", 8, 0x2F, 0xFF, 0xFF, false, false),
 84 |                 new CRC("CRC8_CDMA2000", 8, 0x9B, 0xFF, 0x00, false, false),
 85 |                 new CRC("CRC8_DARC", 8, 0x39, 0x00, 0x00, true, true),
 86 |                 new CRC("CRC8_DVB_S2", 8, 0xD5, 0x00, 0x00, false, false),
 87 |                 new CRC("CRC8_EBU", 8, 0x1D, 0xFF, 0x00, true, true),
 88 |                 new CRC("CRC8_ICODE", 8, 0x1D, 0xFD, 0x00, false, false),
 89 |                 new CRC("CRC8_ITU", 8, 0x07, 0x00, 0x55, false, false),
 90 |                 new CRC("CRC8_MAXIM", 8, 0x31, 0x00, 0x00, true, true),
 91 |                 new CRC("CRC8_ROHC", 8, 0x07, 0xFF, 0x00, true, true),
 92 |                 new CRC("CRC8_WCDMA", 8, 0x9B, 0x00, 0x00, true, true),
 93 |                 new CRC("CRC16_CCIT_ZERO", 16, 0x1021, 0x0000, 0x0000, false, false),
 94 |                 new CRC("CRC16_ARC", 16, 0x8005, 0x0000, 0x0000, true, true),
 95 |                 new CRC("CRC16_AUG_CCITT", 16, 0x1021, 0x1D0F, 0x0000, false, false),
 96 |                 new CRC("CRC16_BUYPASS", 16, 0x8005, 0x0000, 0x0000, false, false),
 97 |                 new CRC("CRC16_CCITT_FALSE", 16, 0x1021, 0xFFFF, 0x0000, false, false),
 98 |                 new CRC("CRC16_CDMA2000", 16, 0xC867, 0xFFFF, 0x0000, false, false),
 99 |                 new CRC("CRC16_DDS_110", 16, 0x8005, 0x800D, 0x0000, false, false),
100 |                 new CRC("CRC16_DECT_R", 16, 0x0589, 0x0000, 0x0001, false, false),
101 |                 new CRC("CRC16_DECT_X", 16, 0x0589, 0x0000, 0x0000, false, false),
102 |                 new CRC("CRC16_DNP", 16, 0x3D65, 0x0000, 0xFFFF, true, true),
103 |                 new CRC("CRC16_EN_13757", 16, 0x3D65, 0x0000, 0xFFFF, false, false),
104 |                 new CRC("CRC16_GENIBUS", 16, 0x1021, 0xFFFF, 0xFFFF, false, false),
105 |                 new CRC("CRC16_MAXIM", 16, 0x8005, 0x0000, 0xFFFF, true, true),
106 |                 new CRC("CRC16_MCRF4XX", 16, 0x1021, 0xFFFF, 0x0000, true, true),
107 |                 new CRC("CRC16_RIELLO", 16, 0x1021, 0xB2AA, 0x0000, true, true),
108 |                 new CRC("CRC16_T10_DIF", 16, 0x8BB7, 0x0000, 0x0000, false, false),
109 |                 new CRC("CRC16_TELEDISK", 16, 0xA097, 0x0000, 0x0000, false, false),
110 |                 new CRC("CRC16_TMS37157", 16, 0x1021, 0x89EC, 0x0000, true, true),
111 |                 new CRC("CRC16_USB", 16, 0x8005, 0xFFFF, 0xFFFF, true, true),
112 |                 new CRC("CRC16_A", 16, 0x1021, 0xC6C6, 0x0000, true, true),
113 |                 new CRC("CRC16_KERMIT", 16, 0x1021, 0x0000, 0x0000, true, true),
114 |                 new CRC("CRC16_MODBUS", 16, 0x8005, 0xFFFF, 0x0000, true, true),
115 |                 new CRC("CRC16_X_25", 16, 0x1021, 0xFFFF, 0xFFFF, true, true),
116 |                 new CRC("CRC16_XMODEM", 16, 0x1021, 0x0000, 0x0000, false, false),
117 |                 new CRC("CRC32", 32, 0x04C11DB7, 0xFFFFFFFF, 0xFFFFFFFF, true, true),
118 |                 new CRC("CRC32_BZIP2", 32, 0x04C11DB7, 0xFFFFFFFF, 0xFFFFFFFF, false, false),
119 |                 new CRC("CRC32_C", 32, 0x1EDC6F41, 0xFFFFFFFF, 0xFFFFFFFF, true, true),
120 |                 new CRC("CRC32_D", 32, 0xA833982B, 0xFFFFFFFF, 0xFFFFFFFF, true, true),
121 |                 new CRC("CRC32_MPEG2", 32, 0x04C11DB7, 0xFFFFFFFF, 0x00000000, false, false),
122 |                 new CRC("CRC32_POSIX", 32, 0x04C11DB7, 0x00000000, 0xFFFFFFFF, false, false),
123 |                 new CRC("CRC32_Q", 32, 0x814141AB, 0x00000000, 0x00000000, false, false),
124 |                 new CRC("CRC32_JAMCRC", 32, 0x04C11DB7, 0xFFFFFFFF, 0x00000000, true, true),
125 |                 new CRC("CRC32_XFER", 32, 0x000000AF, 0x00000000, 0x00000000, false, false)
126 |             ]
127 |         }
128 |         return this._list;
129 |     }
130 | 
131 |     public makeCrcTable() {
132 |         this._crcTable = new Array(256);
133 | 
134 |         for (var divident = 0; divident < 256; divident++) {
135 |             var currByte = (divident << (this._width - 8)) & this._castMask;
136 |             for (var bit = 0; bit < 8; bit++) {
137 |                 if ((currByte & this._msbMask) != 0) {
138 |                     currByte <<= 1;
139 |                     currByte ^= this._polynomial;
140 |                 } else {
141 |                     currByte <<= 1;
142 |                 }
143 |             }
144 |             this._crcTable[divident] = (currByte & this._castMask);
145 |         }
146 |     }
147 | 
148 |     public makeCrcTableReversed() {
149 |         this._crcTable = new Array(256);
150 | 
151 |         for (var divident = 0; divident < 256; divident++) {
152 |             var reflectedDivident = CrcUtil.Reflect8(divident);
153 | 
154 |             var currByte = (reflectedDivident << (this._width - 8)) & this._castMask;
155 | 
156 |             for (var bit = 0; bit < 8; bit++) {
157 |                 if ((currByte & this._msbMask) != 0) {
158 |                     currByte <<= 1;
159 |                     currByte ^= this._polynomial;
160 |                 } else {
161 |                     currByte <<= 1;
162 |                 }
163 |             }
164 | 
165 |             currByte = CrcUtil.ReflectGeneric(currByte, this.width);
166 | 
167 |             this._crcTable[divident] = (currByte & this._castMask);
168 |         }
169 |     }
170 | 
171 |     public compute(bytes: number[] | Buffer) {
172 |         if (!this._crcTable)
173 |             this.makeCrcTable();
174 |         var crc = this._initialVal;
175 |         for (var i = 0; i < bytes.length; i++) {
176 | 
177 |             var curByte = bytes[i] & 0xFF;
178 | 
179 |             if (this.inputReflected) {
180 |                 curByte = CrcUtil.Reflect8(curByte);
181 |             }
182 | 
183 |             /* update the MSB of crc value with next input byte */
184 |             crc = (crc ^ (curByte << (this._width - 8))) & this._castMask;
185 |             /* this MSB byte value is the index into the lookup table */
186 |             var pos = (crc >> (this.width - 8)) & 0xFF;
187 |             /* shift out this index */
188 |             crc = (crc << 8) & this._castMask;
189 |             /* XOR-in remainder from lookup table using the calculated index */
190 |             crc = (crc ^ this._crcTable[pos]) & this._castMask;
191 |         }
192 | 
193 |         if (this.resultReflected) {
194 |             crc = CrcUtil.ReflectGeneric(crc, this.width);
195 |         }
196 |         return ((crc ^ this._finalXorVal) & this._castMask);
197 |     }
198 | 
199 |     public computeBuffer(bytes: number[] | Buffer) {
200 |         let val = this.compute(bytes);
201 |         if (this.width === 8) {
202 |             return Buffer.from([val])
203 |         } else if (this.width === 16) {
204 |             let b = Buffer.alloc(2);
205 |             b.writeUInt16BE(val, 0);
206 |             return b;
207 |         } else if (this.width === 32) {
208 |             let b = Buffer.alloc(4);
209 |             b.writeUInt32BE(val, 0);
210 |             return b;
211 |         } else {
212 |             throw new Error("Unsupported length");
213 |         }
214 |     }
215 | 
216 |     public get table() {
217 |         return this._crcTable;
218 |     }
219 | 
220 |     public static default(name: string): CRC | undefined {
221 |         return CRC
222 |             .defaults
223 |             .find((o: CRC): boolean => o.name === name);
224 |     }
225 | }


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/dist/crc.js:
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  1 | "use strict";
  2 | Object.defineProperty(exports, "__esModule", { value: true });
  3 | var crcUtil_1 = require("./crcUtil");
  4 | var CRC = (function () {
  5 |     function CRC(name, width, polynomial, initial, finalXor, inputReflected, resultReflected) {
  6 |         this.width = width;
  7 |         this.name = name;
  8 |         this.polynomial = polynomial;
  9 |         this.initial = initial;
 10 |         this.finalXor = finalXor;
 11 |         this.inputReflected = inputReflected;
 12 |         this.resultReflected = resultReflected;
 13 |     }
 14 |     Object.defineProperty(CRC.prototype, "width", {
 15 |         get: function () { return this._width; },
 16 |         set: function (v) {
 17 |             this._width = v;
 18 |             switch (v) {
 19 |                 case 8:
 20 |                     this._castMask = 0xFF;
 21 |                     break;
 22 |                 case 16:
 23 |                     this._castMask = 0xFFFF;
 24 |                     break;
 25 |                 case 32:
 26 |                     this._castMask = 0xFFFFFFFF;
 27 |                     break;
 28 |                 default:
 29 |                     throw "Invalid CRC width";
 30 |             }
 31 |             this._msbMask = 0x01 << (v - 1);
 32 |         },
 33 |         enumerable: true,
 34 |         configurable: true
 35 |     });
 36 |     Object.defineProperty(CRC.prototype, "name", {
 37 |         get: function () { return this._name; },
 38 |         set: function (v) {
 39 |             this._name = v;
 40 |         },
 41 |         enumerable: true,
 42 |         configurable: true
 43 |     });
 44 |     Object.defineProperty(CRC.prototype, "polynomial", {
 45 |         get: function () { return this._polynomial; },
 46 |         set: function (v) {
 47 |             this._polynomial = v;
 48 |         },
 49 |         enumerable: true,
 50 |         configurable: true
 51 |     });
 52 |     Object.defineProperty(CRC.prototype, "initial", {
 53 |         get: function () { return this._initialVal; },
 54 |         set: function (v) {
 55 |             this._initialVal = v;
 56 |         },
 57 |         enumerable: true,
 58 |         configurable: true
 59 |     });
 60 |     Object.defineProperty(CRC.prototype, "finalXor", {
 61 |         get: function () { return this._finalXorVal; },
 62 |         set: function (v) {
 63 |             this._finalXorVal = v;
 64 |         },
 65 |         enumerable: true,
 66 |         configurable: true
 67 |     });
 68 |     Object.defineProperty(CRC.prototype, "inputReflected", {
 69 |         get: function () { return this._inputReflected; },
 70 |         set: function (v) {
 71 |             this._inputReflected = v;
 72 |         },
 73 |         enumerable: true,
 74 |         configurable: true
 75 |     });
 76 |     Object.defineProperty(CRC.prototype, "resultReflected", {
 77 |         get: function () { return this._resultReflected; },
 78 |         set: function (v) {
 79 |             this._resultReflected = v;
 80 |         },
 81 |         enumerable: true,
 82 |         configurable: true
 83 |     });
 84 |     Object.defineProperty(CRC, "defaults", {
 85 |         get: function () {
 86 |             if (!this._list) {
 87 |                 this._list = [
 88 |                     new CRC("CRC8", 8, 0x07, 0x00, 0x00, false, false),
 89 |                     new CRC("CRC8_SAE_J1850", 8, 0x1D, 0xFF, 0xFF, false, false),
 90 |                     new CRC("CRC8_SAE_J1850_ZERO", 8, 0x1D, 0x00, 0x00, false, false),
 91 |                     new CRC("CRC8_8H2F", 8, 0x2F, 0xFF, 0xFF, false, false),
 92 |                     new CRC("CRC8_CDMA2000", 8, 0x9B, 0xFF, 0x00, false, false),
 93 |                     new CRC("CRC8_DARC", 8, 0x39, 0x00, 0x00, true, true),
 94 |                     new CRC("CRC8_DVB_S2", 8, 0xD5, 0x00, 0x00, false, false),
 95 |                     new CRC("CRC8_EBU", 8, 0x1D, 0xFF, 0x00, true, true),
 96 |                     new CRC("CRC8_ICODE", 8, 0x1D, 0xFD, 0x00, false, false),
 97 |                     new CRC("CRC8_ITU", 8, 0x07, 0x00, 0x55, false, false),
 98 |                     new CRC("CRC8_MAXIM", 8, 0x31, 0x00, 0x00, true, true),
 99 |                     new CRC("CRC8_ROHC", 8, 0x07, 0xFF, 0x00, true, true),
100 |                     new CRC("CRC8_WCDMA", 8, 0x9B, 0x00, 0x00, true, true),
101 |                     new CRC("CRC16_CCIT_ZERO", 16, 0x1021, 0x0000, 0x0000, false, false),
102 |                     new CRC("CRC16_ARC", 16, 0x8005, 0x0000, 0x0000, true, true),
103 |                     new CRC("CRC16_AUG_CCITT", 16, 0x1021, 0x1D0F, 0x0000, false, false),
104 |                     new CRC("CRC16_BUYPASS", 16, 0x8005, 0x0000, 0x0000, false, false),
105 |                     new CRC("CRC16_CCITT_FALSE", 16, 0x1021, 0xFFFF, 0x0000, false, false),
106 |                     new CRC("CRC16_CDMA2000", 16, 0xC867, 0xFFFF, 0x0000, false, false),
107 |                     new CRC("CRC16_DDS_110", 16, 0x8005, 0x800D, 0x0000, false, false),
108 |                     new CRC("CRC16_DECT_R", 16, 0x0589, 0x0000, 0x0001, false, false),
109 |                     new CRC("CRC16_DECT_X", 16, 0x0589, 0x0000, 0x0000, false, false),
110 |                     new CRC("CRC16_DNP", 16, 0x3D65, 0x0000, 0xFFFF, true, true),
111 |                     new CRC("CRC16_EN_13757", 16, 0x3D65, 0x0000, 0xFFFF, false, false),
112 |                     new CRC("CRC16_GENIBUS", 16, 0x1021, 0xFFFF, 0xFFFF, false, false),
113 |                     new CRC("CRC16_MAXIM", 16, 0x8005, 0x0000, 0xFFFF, true, true),
114 |                     new CRC("CRC16_MCRF4XX", 16, 0x1021, 0xFFFF, 0x0000, true, true),
115 |                     new CRC("CRC16_RIELLO", 16, 0x1021, 0xB2AA, 0x0000, true, true),
116 |                     new CRC("CRC16_T10_DIF", 16, 0x8BB7, 0x0000, 0x0000, false, false),
117 |                     new CRC("CRC16_TELEDISK", 16, 0xA097, 0x0000, 0x0000, false, false),
118 |                     new CRC("CRC16_TMS37157", 16, 0x1021, 0x89EC, 0x0000, true, true),
119 |                     new CRC("CRC16_USB", 16, 0x8005, 0xFFFF, 0xFFFF, true, true),
120 |                     new CRC("CRC16_A", 16, 0x1021, 0xC6C6, 0x0000, true, true),
121 |                     new CRC("CRC16_KERMIT", 16, 0x1021, 0x0000, 0x0000, true, true),
122 |                     new CRC("CRC16_MODBUS", 16, 0x8005, 0xFFFF, 0x0000, true, true),
123 |                     new CRC("CRC16_X_25", 16, 0x1021, 0xFFFF, 0xFFFF, true, true),
124 |                     new CRC("CRC16_XMODEM", 16, 0x1021, 0x0000, 0x0000, false, false),
125 |                     new CRC("CRC32", 32, 0x04C11DB7, 0xFFFFFFFF, 0xFFFFFFFF, true, true),
126 |                     new CRC("CRC32_BZIP2", 32, 0x04C11DB7, 0xFFFFFFFF, 0xFFFFFFFF, false, false),
127 |                     new CRC("CRC32_C", 32, 0x1EDC6F41, 0xFFFFFFFF, 0xFFFFFFFF, true, true),
128 |                     new CRC("CRC32_D", 32, 0xA833982B, 0xFFFFFFFF, 0xFFFFFFFF, true, true),
129 |                     new CRC("CRC32_MPEG2", 32, 0x04C11DB7, 0xFFFFFFFF, 0x00000000, false, false),
130 |                     new CRC("CRC32_POSIX", 32, 0x04C11DB7, 0x00000000, 0xFFFFFFFF, false, false),
131 |                     new CRC("CRC32_Q", 32, 0x814141AB, 0x00000000, 0x00000000, false, false),
132 |                     new CRC("CRC32_JAMCRC", 32, 0x04C11DB7, 0xFFFFFFFF, 0x00000000, true, true),
133 |                     new CRC("CRC32_XFER", 32, 0x000000AF, 0x00000000, 0x00000000, false, false)
134 |                 ];
135 |             }
136 |             return this._list;
137 |         },
138 |         enumerable: true,
139 |         configurable: true
140 |     });
141 |     CRC.prototype.makeCrcTable = function () {
142 |         this._crcTable = new Array(256);
143 |         for (var divident = 0; divident < 256; divident++) {
144 |             var currByte = (divident << (this._width - 8)) & this._castMask;
145 |             for (var bit = 0; bit < 8; bit++) {
146 |                 if ((currByte & this._msbMask) != 0) {
147 |                     currByte <<= 1;
148 |                     currByte ^= this._polynomial;
149 |                 }
150 |                 else {
151 |                     currByte <<= 1;
152 |                 }
153 |             }
154 |             this._crcTable[divident] = (currByte & this._castMask);
155 |         }
156 |     };
157 |     CRC.prototype.makeCrcTableReversed = function () {
158 |         this._crcTable = new Array(256);
159 |         for (var divident = 0; divident < 256; divident++) {
160 |             var reflectedDivident = crcUtil_1.default.Reflect8(divident);
161 |             var currByte = (reflectedDivident << (this._width - 8)) & this._castMask;
162 |             for (var bit = 0; bit < 8; bit++) {
163 |                 if ((currByte & this._msbMask) != 0) {
164 |                     currByte <<= 1;
165 |                     currByte ^= this._polynomial;
166 |                 }
167 |                 else {
168 |                     currByte <<= 1;
169 |                 }
170 |             }
171 |             currByte = crcUtil_1.default.ReflectGeneric(currByte, this.width);
172 |             this._crcTable[divident] = (currByte & this._castMask);
173 |         }
174 |     };
175 |     CRC.prototype.compute = function (bytes) {
176 |         if (!this._crcTable)
177 |             this.makeCrcTable();
178 |         var crc = this._initialVal;
179 |         for (var i = 0; i < bytes.length; i++) {
180 |             var curByte = bytes[i] & 0xFF;
181 |             if (this.inputReflected) {
182 |                 curByte = crcUtil_1.default.Reflect8(curByte);
183 |             }
184 |             crc = (crc ^ (curByte << (this._width - 8))) & this._castMask;
185 |             var pos = (crc >> (this.width - 8)) & 0xFF;
186 |             crc = (crc << 8) & this._castMask;
187 |             crc = (crc ^ this._crcTable[pos]) & this._castMask;
188 |         }
189 |         if (this.resultReflected) {
190 |             crc = crcUtil_1.default.ReflectGeneric(crc, this.width);
191 |         }
192 |         return ((crc ^ this._finalXorVal) & this._castMask);
193 |     };
194 |     CRC.prototype.computeBuffer = function (bytes) {
195 |         var val = this.compute(bytes);
196 |         if (this.width === 8) {
197 |             return Buffer.from([val]);
198 |         }
199 |         else if (this.width === 16) {
200 |             var b = Buffer.alloc(2);
201 |             b.writeUInt16BE(val, 0);
202 |             return b;
203 |         }
204 |         else if (this.width === 32) {
205 |             var b = Buffer.alloc(4);
206 |             b.writeUInt32BE(val, 0);
207 |             return b;
208 |         }
209 |         else {
210 |             throw new Error("Unsupported length");
211 |         }
212 |     };
213 |     Object.defineProperty(CRC.prototype, "table", {
214 |         get: function () {
215 |             return this._crcTable;
216 |         },
217 |         enumerable: true,
218 |         configurable: true
219 |     });
220 |     CRC.default = function (name) {
221 |         return CRC
222 |             .defaults
223 |             .find(function (o) { return o.name === name; });
224 |     };
225 |     return CRC;
226 | }());
227 | exports.CRC = CRC;
228 | //# sourceMappingURL=crc.js.map


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