easy-crc - npm Package Compare versions

Comparing version 1.0.0 to 1.1.0

dist/src/lib/crc16.d.ts

@@ -6,5 +6,6 @@ /// <reference types="node" />
  * @param {String|Buffer} data A string or an array of bytes
+ * @param {Number=} seed A number
  * @returns {Number} CRC16 checksum
  */
-declare function crc16(algorithm: keyof Crc16Algorithms, data: string | Buffer): number;
+declare function crc16(algorithm: keyof Crc16Algorithms, data: string | Buffer, seed?: number): number;
 export { crc16 };

dist/src/lib/crc16.js

@@ -56,5 +56,6 @@ "use strict";
  * @param {String|Buffer} data A string or an array of bytes
+ * @param {Number=} seed A number
  * @returns {Number} CRC16 checksum
  */
-function crc16(algorithm, data) {
+function crc16(algorithm, data, seed) {
     const availables = Object.keys(crc16Algorithms);
@@ -66,3 +67,3 @@ if (!availables.includes(algorithm))
     const { init, invertedInit, xorOut, refOut, refIn, table } = crc16Algorithms[algorithm];
-    let crc = refIn ? invertedInit || 0 : init;
+    let crc = seed ? seed ^ xorOut : (refIn ? invertedInit || 0 : init);
     if (refOut) {
@@ -69,0 +70,0 @@ for (const b of data)

dist/src/lib/crc32.d.ts

@@ -6,5 +6,6 @@ /// <reference types="node" />
  * @param {String|Buffer} data A string or an array of bytes
+ * @param {Number=} seed A number
  * @returns {Number} CRC32 checksum
  */
-declare function crc32(algorithm: keyof Crc32Algorithms, data: string | Buffer): number;
+declare function crc32(algorithm: keyof Crc32Algorithms, data: string | Buffer, seed?: number): number;
 export { crc32 };

dist/src/lib/crc32.js

@@ -28,5 +28,6 @@ "use strict";
  * @param {String|Buffer} data A string or an array of bytes
+ * @param {Number=} seed A number
  * @returns {Number} CRC32 checksum
  */
-function crc32(algorithm, data) {
+function crc32(algorithm, data, seed) {
     const availables = Object.keys(crc32Algorithms);
@@ -38,3 +39,3 @@ if (!availables.includes(algorithm))
     const { init, xorOut, refOut, table } = crc32Algorithms[algorithm];
-    let crc = init;
+    let crc = seed ? (seed ^ xorOut) : init;
     if (refOut) {
@@ -41,0 +42,0 @@ for (const b of data)

dist/src/lib/crc8.d.ts

@@ -6,5 +6,6 @@ /// <reference types="node" />
  * @param {String|Buffer} data A string or an array of bytes
+ * @param {Number=} seed A number
  * @returns {Number} CRC8 checksum
  */
-declare function crc8(algorithm: keyof Crc8Algorithms, data: string | Buffer): number;
+declare function crc8(algorithm: keyof Crc8Algorithms, data: string | Buffer, seed?: number): number;
 export { crc8 };

dist/src/lib/crc8.js

@@ -30,5 +30,6 @@ "use strict";
  * @param {String|Buffer} data A string or an array of bytes
+ * @param {Number=} seed A number
  * @returns {Number} CRC8 checksum
  */
-function crc8(algorithm, data) {
+function crc8(algorithm, data, seed) {
     const availables = Object.keys(crc8Algorithms);
@@ -40,3 +41,3 @@ if (!availables.includes(algorithm))
     const { init, xorOut, table } = crc8Algorithms[algorithm];
-    let crc = init;
+    let crc = seed ? seed ^ xorOut : init;
     for (const b of data)
@@ -43,0 +44,0 @@ crc = table[crc ^ b];

dist/test/crc16.test.js

@@ -13,14 +13,28 @@ "use strict";
     describe('CCITT-FALSE', function () {
-        it('should return 0x7D61', function (done) {
-            const crcCheck = (0, index_1.crc16)('CCITT-FALSE', check);
-            crcCheck.should.equal(0x7D61);
+        const algorithm = 'CCITT-FALSE';
+        const expected = 0x7D61;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('ARC', function () {
-        it('should return 0x443D', function (done) {
-            const crcCheck = (0, index_1.crc16)('ARC', check);
-            crcCheck.should.equal(0x443D);
+        const algorithm = 'ARC';
+        const expected = 0x443D;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
@@ -35,119 +49,238 @@ // describe('AUG-CCITT', function () {
     describe('CDMA2000', function () {
-        it('should return 0xD89D', function (done) {
-            const crcCheck = (0, index_1.crc16)('CDMA2000', check);
-            crcCheck.should.equal(0xD89D);
+        const algorithm = 'CDMA2000';
+        const expected = 0xD89D;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('BUYPASS', function () {
-        it('should return 0xFD14', function (done) {
-            const crcCheck = (0, index_1.crc16)('BUYPASS', check);
-            crcCheck.should.equal(0xFD14);
+        const algorithm = 'BUYPASS';
+        const expected = 0xFD14;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('DDS-110', function () {
-        it('should return 0xDB54', function (done) {
-            const crcCheck = (0, index_1.crc16)('DDS-110', check);
-            crcCheck.should.equal(0xDB54);
+        const algorithm = 'DDS-110';
+        const expected = 0xDB54;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('DECT-R', function () {
-        it('should return 0x422B', function (done) {
-            const crcCheck = (0, index_1.crc16)('DECT-R', check);
-            crcCheck.should.equal(0x422B);
+        const algorithm = 'DECT-R';
+        const expected = 0x422B;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('DECT-X', function () {
-        it('should return 0x422A', function (done) {
-            const crcCheck = (0, index_1.crc16)('DECT-X', check);
-            crcCheck.should.equal(0x422A);
+        const algorithm = 'DECT-X';
+        const expected = 0x422A;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('DNP', function () {
-        it('should return 0x6772', function (done) {
-            const crcCheck = (0, index_1.crc16)('DNP', check);
-            crcCheck.should.equal(0x6772);
+        const algorithm = 'DNP';
+        const expected = 0x6772;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('EN-13757', function () {
-        it('should return 0xFC73', function (done) {
-            const crcCheck = (0, index_1.crc16)('EN-13757', check);
-            crcCheck.should.equal(0xFC73);
+        const algorithm = 'EN-13757';
+        const expected = 0xFC73;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('GENIBUS', function () {
-        it('should return 0x829E', function (done) {
-            const crcCheck = (0, index_1.crc16)('GENIBUS', check);
-            crcCheck.should.equal(0x829E);
+        const algorithm = 'GENIBUS';
+        const expected = 0x829E;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('MAXIM', function () {
-        it('should return 0xBBC2', function (done) {
-            const crcCheck = (0, index_1.crc16)('MAXIM', check);
-            crcCheck.should.equal(0xBBC2);
+        const algorithm = 'MAXIM';
+        const expected = 0xBBC2;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('KERMIT', function () {
-        it('should return 0x5F6E', function (done) {
-            const crcCheck = (0, index_1.crc16)('KERMIT', check);
-            crcCheck.should.equal(0x5F6E);
+        const algorithm = 'KERMIT';
+        const expected = 0x5F6E;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('MCRF4XX', function () {
-        it('should return 0xC3E9', function (done) {
-            const crcCheck = (0, index_1.crc16)('MCRF4XX', check);
-            crcCheck.should.equal(0xC3E9);
+        const algorithm = 'MCRF4XX';
+        const expected = 0xC3E9;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('MODBUS', function () {
-        it('should return 0x434D', function (done) {
-            const crcCheck = (0, index_1.crc16)('MODBUS', check);
-            crcCheck.should.equal(0x434D);
+        const algorithm = 'MODBUS';
+        const expected = 0x434D;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('RIELLO', function () {
-        it('should return 0x9068', function (done) {
-            const crcCheck = (0, index_1.crc16)('RIELLO', check);
-            crcCheck.should.equal(0x9068);
+        const algorithm = 'RIELLO';
+        const expected = 0x9068;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('T10-DIF', function () {
-        it('should return 0xDE40', function (done) {
-            const crcCheck = (0, index_1.crc16)('T10-DIF', check);
-            crcCheck.should.equal(0xDE40);
+        const algorithm = 'T10-DIF';
+        const expected = 0xDE40;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('TELEDISK', function () {
-        it('should return 0x1BBF', function (done) {
-            const crcCheck = (0, index_1.crc16)('TELEDISK', check);
-            crcCheck.should.equal(0x1BBF);
+        const algorithm = 'TELEDISK';
+        const expected = 0x1BBF;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('TMS37157', function () {
-        it('should return 0xE2A2', function (done) {
-            const crcCheck = (0, index_1.crc16)('TMS37157', check);
-            crcCheck.should.equal(0xE2A2);
+        const algorithm = 'TMS37157';
+        const expected = 0xE2A2;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('USB', function () {
-        it('should return 0xBCB2', function (done) {
-            const crcCheck = (0, index_1.crc16)('USB', check);
-            crcCheck.should.equal(0xBCB2);
+        const algorithm = 'USB';
+        const expected = 0xBCB2;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
@@ -160,17 +293,43 @@ describe('X-25', function () {
         });
+        const algorithm = 'X-25';
+        const expected = 0x3C16;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
+            done();
+        });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('XMODEM', function () {
-        it('should return 0x9C58', function (done) {
-            const crcCheck = (0, index_1.crc16)('XMODEM', check);
-            crcCheck.should.equal(0x9C58);
+        const algorithm = 'XMODEM';
+        const expected = 0x9C58;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('CRC-A', function () {
-        it('should return 0x1194', function (done) {
-            const crcCheck = (0, index_1.crc16)('CRC-A', check);
-            crcCheck.should.equal(0x1194);
+        const algorithm = 'CRC-A';
+        const expected = 0x1194;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc16)(algorithm, check.slice(5), (0, index_1.crc16)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
 });

dist/test/crc32.test.js

@@ -13,64 +13,127 @@ "use strict";
     describe('CRC-32', function () {
-        it('should return 0xA684C7C6', function (done) {
-            const crcCheck = (0, index_1.crc32)('CRC-32', check);
-            crcCheck.should.equal(0xA684C7C6);
+        const algorithm = 'CRC-32';
+        const expected = 0xA684C7C6;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc32)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc32)(algorithm, check.slice(5), (0, index_1.crc32)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('CRC-32C', function () {
-        it('should return 0x280C069E', function (done) {
-            const crcCheck = (0, index_1.crc32)('CRC-32C', check);
-            crcCheck.should.equal(0x280C069E);
+        const algorithm = 'CRC-32C';
+        const expected = 0x280C069E;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc32)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc32)(algorithm, check.slice(5), (0, index_1.crc32)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('CRC-32D', function () {
-        it('should return 0x95ED974E', function (done) {
-            const crcCheck = (0, index_1.crc32)('CRC-32D', check);
-            crcCheck.should.equal(0x95ED974E);
+        const algorithm = 'CRC-32D';
+        const expected = 0x95ED974E;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc32)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc32)(algorithm, check.slice(5), (0, index_1.crc32)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('CRC-32Q', function () {
-        it('should return 0xB1FF798E', function (done) {
-            const crcCheck = (0, index_1.crc32)('CRC-32Q', check);
-            crcCheck.should.equal(0xB1FF798E);
+        const algorithm = 'CRC-32Q';
+        const expected = 0xB1FF798E;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc32)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc32)(algorithm, check.slice(5), (0, index_1.crc32)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('BZIP2', function () {
-        it('should return 0x96B0E4E0', function (done) {
-            const crcCheck = (0, index_1.crc32)('BZIP2', check);
-            crcCheck.should.equal(0x96B0E4E0);
+        const algorithm = 'BZIP2';
+        const expected = 0x96B0E4E0;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc32)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc32)(algorithm, check.slice(5), (0, index_1.crc32)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('JAMCRC', function () {
-        it('should return 0x597B3839', function (done) {
-            const crcCheck = (0, index_1.crc32)('JAMCRC', check);
-            crcCheck.should.equal(0x597B3839);
+        const algorithm = 'JAMCRC';
+        const expected = 0x597B3839;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc32)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc32)(algorithm, check.slice(5), (0, index_1.crc32)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('MPEG-2', function () {
-        it('should return 0x694F1B1F', function (done) {
-            const crcCheck = (0, index_1.crc32)('MPEG-2', check);
-            crcCheck.should.equal(0x694F1B1F);
+        const algorithm = 'MPEG-2';
+        const expected = 0x694F1B1F;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc32)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc32)(algorithm, check.slice(5), (0, index_1.crc32)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('POSIX', function () {
-        it('should return 0x07594AD8', function (done) {
-            const crcCheck = (0, index_1.crc32)('POSIX', check);
-            crcCheck.should.equal(0x07594AD8);
+        const algorithm = 'POSIX';
+        const expected = 0x07594AD8;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc32)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc32)(algorithm, check.slice(5), (0, index_1.crc32)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('XFER', function () {
-        it('should return 0x031DB075', function (done) {
-            const crcCheck = (0, index_1.crc32)('XFER', check);
-            crcCheck.should.equal(0x031DB075);
+        const algorithm = 'XFER';
+        const expected = 0x031DB075;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc32)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc32)(algorithm, check.slice(5), (0, index_1.crc32)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
 });

dist/test/crc8.test.js

@@ -13,71 +13,141 @@ "use strict";
     describe('CRC-8', function () {
-        it('should return 0x45', function (done) {
-            const crcCheck = (0, index_1.crc8)('CRC-8', check);
-            crcCheck.should.equal(0x45);
+        const algorithm = 'CRC-8';
+        const expected = 0x45;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check.slice(5), (0, index_1.crc8)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('CDMA2000', function () {
-        it('should return 0xAB', function (done) {
-            const crcCheck = (0, index_1.crc8)('CDMA2000', check);
-            crcCheck.should.equal(0xAB);
+        const algorithm = 'CDMA2000';
+        const expected = 0xAB;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check.slice(5), (0, index_1.crc8)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('DARC', function () {
-        it('should return 0x83', function (done) {
-            const crcCheck = (0, index_1.crc8)('DARC', check);
-            crcCheck.should.equal(0x83);
+        const algorithm = 'DARC';
+        const expected = 0x83;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check.slice(5), (0, index_1.crc8)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('DVB-S2', function () {
-        it('should return 0x26', function (done) {
-            const crcCheck = (0, index_1.crc8)('DVB-S2', check);
-            crcCheck.should.equal(0x26);
+        const algorithm = 'DVB-S2';
+        const expected = 0x26;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check.slice(5), (0, index_1.crc8)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('EBU', function () {
-        it('should return 0xC0', function (done) {
-            const crcCheck = (0, index_1.crc8)('EBU', check);
-            crcCheck.should.equal(0xC0);
+        const algorithm = 'EBU';
+        const expected = 0xC0;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check.slice(5), (0, index_1.crc8)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('I-CODE', function () {
-        it('should return 0x6C', function (done) {
-            const crcCheck = (0, index_1.crc8)('I-CODE', check);
-            crcCheck.should.equal(0x6C);
+        const algorithm = 'I-CODE';
+        const expected = 0x6C;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check.slice(5), (0, index_1.crc8)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('ITU', function () {
-        it('should return 0x10', function (done) {
-            const crcCheck = (0, index_1.crc8)('ITU', check);
-            crcCheck.should.equal(0x10);
+        const algorithm = 'ITU';
+        const expected = 0x10;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check.slice(5), (0, index_1.crc8)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('MAXIM', function () {
-        it('should return 0x75', function (done) {
-            const crcCheck = (0, index_1.crc8)('MAXIM', check);
-            crcCheck.should.equal(0x75);
+        const algorithm = 'MAXIM';
+        const expected = 0x75;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check.slice(5), (0, index_1.crc8)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('ROHC', function () {
-        it('should return 0xE3', function (done) {
-            const crcCheck = (0, index_1.crc8)('ROHC', check);
-            crcCheck.should.equal(0xE3);
+        const algorithm = 'ROHC';
+        const expected = 0xE3;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check.slice(5), (0, index_1.crc8)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
     describe('WCDMA', function () {
-        it('should return 0xE3', function (done) {
-            const crcCheck = (0, index_1.crc8)('WCDMA', check);
-            crcCheck.should.equal(0xE3);
+        const algorithm = 'WCDMA';
+        const expected = 0xE3;
+        it(`should return ${expected}`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check);
+            crcCheck.should.equal(expected);
             done();
         });
+        it(`should return ${expected} when seeded`, function (done) {
+            const crcCheck = (0, index_1.crc8)(algorithm, check.slice(5), (0, index_1.crc8)(algorithm, check.slice(0, 5)));
+            crcCheck.should.equal(expected);
+            done();
+        });
     });
 });

package.json

 {
   "name": "easy-crc",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "A pure JavaScript and zero dependencies CRC node module.",
@@ -5,0 +5,0 @@ "main": "dist/index.js",

README.md

@@ -16,4 +16,5 @@ # EASY-CRC
 
-There are three functions available respectively named `crc8()`, `crc16()` and `crc32()`. These functions take two arguments.  
-The first argument is a string with the name of the desired algorithm (below the list), and the second is the data on which you want to calculate crc. Data can be a string or a buffer.
+There are three functions available respectively named `crc8()`, `crc16()` and `crc32()`. These functions take three arguments.  
+The first argument is a string with the name of the desired algorithm (below the list), and the second is the data on which you want to calculate crc. Data can be a string or a buffer.  
+The third parameter is the **CRC seed** and is optional.
 
@@ -20,0 +21,0 @@ ```js

src/lib/crc16.ts

@@ -57,5 +57,6 @@ import { Crc16Algorithms } from "../common/interfaces";
  * @param {String|Buffer} data A string or an array of bytes
+ * @param {Number=} seed A number
  * @returns {Number} CRC16 checksum
  */
-function crc16 (algorithm: keyof Crc16Algorithms, data: string | Buffer) {
+function crc16 (algorithm: keyof Crc16Algorithms, data: string | Buffer, seed?: number) {
    const availables = Object.keys(crc16Algorithms);
@@ -76,3 +77,3 @@ if (!availables.includes(algorithm))
 
-   let crc = refIn ? invertedInit || 0 : init;
+   let crc = seed ? seed ^ xorOut : (refIn ? invertedInit || 0 : init);
    
@@ -79,0 +80,0 @@ if (refOut) {

src/lib/crc32.ts

@@ -29,5 +29,6 @@ import { Crc32Algorithms } from "../common/interfaces";
  * @param {String|Buffer} data A string or an array of bytes
+ * @param {Number=} seed A number
  * @returns {Number} CRC32 checksum
  */
-function crc32 (algorithm: keyof Crc32Algorithms, data: string | Buffer) {
+function crc32 (algorithm: keyof Crc32Algorithms, data: string | Buffer, seed?: number) {
    const availables = Object.keys(crc32Algorithms);
@@ -46,3 +47,3 @@ if (!availables.includes(algorithm))
 
-   let crc = init;
+   let crc = seed ? (seed ^ xorOut) : init;
 
@@ -49,0 +50,0 @@ if (refOut) {

src/lib/crc8.ts

@@ -31,5 +31,6 @@ import { Crc8Algorithms } from "../common/interfaces";
  * @param {String|Buffer} data A string or an array of bytes
+ * @param {Number=} seed A number
  * @returns {Number} CRC8 checksum
  */
-function crc8 (algorithm: keyof Crc8Algorithms, data: string | Buffer) {
+function crc8 (algorithm: keyof Crc8Algorithms, data: string | Buffer, seed?: number) {
    const availables = Object.keys(crc8Algorithms);
@@ -47,3 +48,3 @@ if (!availables.includes(algorithm))
 
-   let crc = init;
+   let crc = seed ? seed ^ xorOut : init;
 
@@ -50,0 +51,0 @@ for (const b of data)

test/crc16.test.ts

@@ -10,14 +10,30 @@ // Return values gotten from https://crccalc.com/
    describe('CCITT-FALSE', function () {
-      it('should return 0x7D61', function (done) {
-         const crcCheck = crc16('CCITT-FALSE', check);
-         crcCheck.should.equal(0x7D61);
+      const algorithm = 'CCITT-FALSE';
+      const expected = 0x7D61;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('ARC', function () {
-      it('should return 0x443D', function (done) {
-         const crcCheck = crc16('ARC', check);
-         crcCheck.should.equal(0x443D);
+      const algorithm = 'ARC';
+      const expected = 0x443D;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
@@ -32,119 +48,255 @@ // describe('AUG-CCITT', function () {
    describe('CDMA2000', function () {
-      it('should return 0xD89D', function (done) {
-         const crcCheck = crc16('CDMA2000', check);
-         crcCheck.should.equal(0xD89D);
+      const algorithm = 'CDMA2000';
+      const expected = 0xD89D;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('BUYPASS', function () {
-      it('should return 0xFD14', function (done) {
-         const crcCheck = crc16('BUYPASS', check);
-         crcCheck.should.equal(0xFD14);
+      const algorithm = 'BUYPASS';
+      const expected = 0xFD14;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('DDS-110', function () {
-      it('should return 0xDB54', function (done) {
-         const crcCheck = crc16('DDS-110', check);
-         crcCheck.should.equal(0xDB54);
+      const algorithm = 'DDS-110';
+      const expected = 0xDB54;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('DECT-R', function () {
-      it('should return 0x422B', function (done) {
-         const crcCheck = crc16('DECT-R', check);
-         crcCheck.should.equal(0x422B);
+      const algorithm = 'DECT-R';
+      const expected = 0x422B;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('DECT-X', function () {
-      it('should return 0x422A', function (done) {
-         const crcCheck = crc16('DECT-X', check);
-         crcCheck.should.equal(0x422A);
+      const algorithm = 'DECT-X';
+      const expected = 0x422A;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('DNP', function () {
-      it('should return 0x6772', function (done) {
-         const crcCheck = crc16('DNP', check);
-         crcCheck.should.equal(0x6772);
+      const algorithm = 'DNP';
+      const expected = 0x6772;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('EN-13757', function () {
-      it('should return 0xFC73', function (done) {
-         const crcCheck = crc16('EN-13757', check);
-         crcCheck.should.equal(0xFC73);
+      const algorithm = 'EN-13757';
+      const expected = 0xFC73;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('GENIBUS', function () {
-      it('should return 0x829E', function (done) {
-         const crcCheck = crc16('GENIBUS', check);
-         crcCheck.should.equal(0x829E);
+      const algorithm = 'GENIBUS';
+      const expected = 0x829E;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('MAXIM', function () {
-      it('should return 0xBBC2', function (done) {
-         const crcCheck = crc16('MAXIM', check);
-         crcCheck.should.equal(0xBBC2);
+      const algorithm = 'MAXIM';
+      const expected = 0xBBC2;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('KERMIT', function () {
-      it('should return 0x5F6E', function (done) {
-         const crcCheck = crc16('KERMIT', check);
-         crcCheck.should.equal(0x5F6E);
+      const algorithm = 'KERMIT';
+      const expected = 0x5F6E;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('MCRF4XX', function () {
-      it('should return 0xC3E9', function (done) {
-         const crcCheck = crc16('MCRF4XX', check);
-         crcCheck.should.equal(0xC3E9);
+      const algorithm = 'MCRF4XX';
+      const expected = 0xC3E9;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('MODBUS', function () {
-      it('should return 0x434D', function (done) {
-         const crcCheck = crc16('MODBUS', check);
-         crcCheck.should.equal(0x434D);
+      const algorithm = 'MODBUS';
+      const expected = 0x434D;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('RIELLO', function () {
-      it('should return 0x9068', function (done) {
-         const crcCheck = crc16('RIELLO', check);
-         crcCheck.should.equal(0x9068);
+      const algorithm = 'RIELLO';
+      const expected = 0x9068;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('T10-DIF', function () {
-      it('should return 0xDE40', function (done) {
-         const crcCheck = crc16('T10-DIF', check);
-         crcCheck.should.equal(0xDE40);
+      const algorithm = 'T10-DIF';
+      const expected = 0xDE40;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('TELEDISK', function () {
-      it('should return 0x1BBF', function (done) {
-         const crcCheck = crc16('TELEDISK', check);
-         crcCheck.should.equal(0x1BBF);
+      const algorithm = 'TELEDISK';
+      const expected = 0x1BBF;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('TMS37157', function () {
-      it('should return 0xE2A2', function (done) {
-         const crcCheck = crc16('TMS37157', check);
-         crcCheck.should.equal(0xE2A2);
+      const algorithm = 'TMS37157';
+      const expected = 0xE2A2;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('USB', function () {
-      it('should return 0xBCB2', function (done) {
-         const crcCheck = crc16('USB', check);
-         crcCheck.should.equal(0xBCB2);
+      const algorithm = 'USB';
+      const expected = 0xBCB2;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
@@ -157,17 +309,46 @@ describe('X-25', function () {
       });
+      const algorithm = 'X-25';
+      const expected = 0x3C16;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
+         done();
+      });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('XMODEM', function () {
-      it('should return 0x9C58', function (done) {
-         const crcCheck = crc16('XMODEM', check);
-         crcCheck.should.equal(0x9C58);
+      const algorithm = 'XMODEM';
+      const expected = 0x9C58;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('CRC-A', function () {
-      it('should return 0x1194', function (done) {
-         const crcCheck = crc16('CRC-A', check);
-         crcCheck.should.equal(0x1194);
+      const algorithm = 'CRC-A';
+      const expected = 0x1194;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc16(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc16(algorithm, check.slice(5), crc16(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
 });

test/crc32.test.ts

 // Return values gotten from https://crccalc.com/
 
+import { doesNotMatch } from 'assert';
 import chai from 'chai';
@@ -10,64 +11,136 @@ import { crc32 } from '../index'
    describe('CRC-32', function () {
-      it('should return 0xA684C7C6', function (done) {
-         const crcCheck = crc32('CRC-32', check);
-         crcCheck.should.equal(0xA684C7C6);
+      const algorithm = 'CRC-32';
+      const expected = 0xA684C7C6;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc32(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc32(algorithm, check.slice(5), crc32(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('CRC-32C', function () {
-      it('should return 0x280C069E', function (done) {
-         const crcCheck = crc32('CRC-32C', check);
-         crcCheck.should.equal(0x280C069E);
+      const algorithm = 'CRC-32C';
+      const expected = 0x280C069E;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc32(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc32(algorithm, check.slice(5), crc32(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('CRC-32D', function () {
-      it('should return 0x95ED974E', function (done) {
-         const crcCheck = crc32('CRC-32D', check);
-         crcCheck.should.equal(0x95ED974E);
+      const algorithm = 'CRC-32D';
+      const expected = 0x95ED974E;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc32(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc32(algorithm, check.slice(5), crc32(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('CRC-32Q', function () {
-      it('should return 0xB1FF798E', function (done) {
-         const crcCheck = crc32('CRC-32Q', check);
-         crcCheck.should.equal(0xB1FF798E);
+      const algorithm = 'CRC-32Q';
+      const expected = 0xB1FF798E;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc32(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc32(algorithm, check.slice(5), crc32(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('BZIP2', function () {
-      it('should return 0x96B0E4E0', function (done) {
-         const crcCheck = crc32('BZIP2', check);
-         crcCheck.should.equal(0x96B0E4E0);
+      const algorithm = 'BZIP2';
+      const expected = 0x96B0E4E0;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc32(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc32(algorithm, check.slice(5), crc32(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('JAMCRC', function () {
-      it('should return 0x597B3839', function (done) {
-         const crcCheck = crc32('JAMCRC', check);
-         crcCheck.should.equal(0x597B3839);
+      const algorithm = 'JAMCRC';
+      const expected = 0x597B3839;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc32(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc32(algorithm, check.slice(5), crc32(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('MPEG-2', function () {
-      it('should return 0x694F1B1F', function (done) {
-         const crcCheck = crc32('MPEG-2', check);
-         crcCheck.should.equal(0x694F1B1F);
+      const algorithm = 'MPEG-2';
+      const expected = 0x694F1B1F;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc32(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc32(algorithm, check.slice(5), crc32(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('POSIX', function () {
-      it('should return 0x07594AD8', function (done) {
-         const crcCheck = crc32('POSIX', check);
-         crcCheck.should.equal(0x07594AD8);
+      const algorithm = 'POSIX';
+      const expected = 0x07594AD8;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc32(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc32(algorithm, check.slice(5), crc32(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('XFER', function () {
-      it('should return 0x031DB075', function (done) {
-         const crcCheck = crc32('XFER', check);
-         crcCheck.should.equal(0x031DB075);
+      const algorithm = 'XFER';
+      const expected = 0x031DB075;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc32(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc32(algorithm, check.slice(5), crc32(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
 });

test/crc8.test.ts

@@ -10,71 +10,151 @@ // Return values got from https://crccalc.com/
    describe('CRC-8', function () {
-      it('should return 0x45', function (done) {
-         const crcCheck = crc8('CRC-8', check);
-         crcCheck.should.equal(0x45);
+      const algorithm = 'CRC-8';
+      const expected = 0x45;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc8(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc8(algorithm, check.slice(5), crc8(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('CDMA2000', function () {
-      it('should return 0xAB', function (done) {
-         const crcCheck = crc8('CDMA2000', check);
-         crcCheck.should.equal(0xAB);
+      const algorithm = 'CDMA2000';
+      const expected = 0xAB;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc8(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc8(algorithm, check.slice(5), crc8(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });      
    });
    describe('DARC', function () {
-      it('should return 0x83', function (done) {
-         const crcCheck = crc8('DARC', check);
-         crcCheck.should.equal(0x83);
+      const algorithm = 'DARC';
+      const expected = 0x83;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc8(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc8(algorithm, check.slice(5), crc8(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('DVB-S2', function () {
-      it('should return 0x26', function (done) {
-         const crcCheck = crc8('DVB-S2', check);
-         crcCheck.should.equal(0x26);
+      const algorithm = 'DVB-S2';
+      const expected = 0x26;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc8(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc8(algorithm, check.slice(5), crc8(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('EBU', function () {
-      it('should return 0xC0', function (done) {
-         const crcCheck = crc8('EBU', check);
-         crcCheck.should.equal(0xC0);
+      const algorithm = 'EBU';
+      const expected = 0xC0;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc8(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc8(algorithm, check.slice(5), crc8(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('I-CODE', function () {
-      it('should return 0x6C', function (done) {
-         const crcCheck = crc8('I-CODE', check);
-         crcCheck.should.equal(0x6C);
+      const algorithm = 'I-CODE';
+      const expected = 0x6C;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc8(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc8(algorithm, check.slice(5), crc8(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('ITU', function () {
-      it('should return 0x10', function (done) {
-         const crcCheck = crc8('ITU', check);
-         crcCheck.should.equal(0x10);
+      const algorithm = 'ITU';
+      const expected = 0x10;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc8(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc8(algorithm, check.slice(5), crc8(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('MAXIM', function () {
-      it('should return 0x75', function (done) {
-         const crcCheck = crc8('MAXIM', check);
-         crcCheck.should.equal(0x75);
+      const algorithm = 'MAXIM';
+      const expected = 0x75;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc8(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc8(algorithm, check.slice(5), crc8(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('ROHC', function () {
-      it('should return 0xE3', function (done) {
-         const crcCheck = crc8('ROHC', check);
-         crcCheck.should.equal(0xE3);
+      const algorithm = 'ROHC';
+      const expected = 0xE3;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc8(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc8(algorithm, check.slice(5), crc8(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
    describe('WCDMA', function () {
-      it('should return 0xE3', function (done) {
-         const crcCheck = crc8('WCDMA', check);
-         crcCheck.should.equal(0xE3);
+      const algorithm = 'WCDMA';
+      const expected = 0xE3;
+
+      it(`should return ${expected}`, function (done) {
+         const crcCheck = crc8(algorithm, check);
+         crcCheck.should.equal(expected);
          done();
       });
+      it(`should return ${expected} when seeded`, function (done) {
+         const crcCheck = crc8(algorithm, check.slice(5), crc8(algorithm, check.slice(0, 5)));
+         crcCheck.should.equal(expected);
+         done();
+      });
    });
 });

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