Remove compatibility legacy code

.gitignore

@@ -1 +1,3 @@
-node_modules
+node_modules
+/.idea
+/.nyc_output

README.md

@@ -7,6 +7,8 @@ buffer, signed or unsigned data and has tests.
 
 Derived from the sample CRC implementation in the PNG specification: http://www.w3.org/TR/PNG/#D-CRCAppendix
 
+This package requires Node 8+ to work.
+
 # install
 ```
 npm install buffer-crc32

index.js

@@ -1,6 +1,4 @@
-var Buffer = require('buffer').Buffer;
-
-var CRC_TABLE = [
+const CRC_TABLE = new Int32Array([
   0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
   0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
   0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
@@ -53,32 +51,18 @@ var CRC_TABLE = [
   0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
   0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
   0x2d02ef8d
-];
-
-var hasNewBufferAPI =
-    typeof Buffer.alloc === "function" &&
-    typeof Buffer.from === "function";
-
-if (typeof Int32Array !== 'undefined') {
-  CRC_TABLE = new Int32Array(CRC_TABLE);
-}
-
-function newEmptyBufferLegacy(length) {
-  var buffer = new Buffer(length);
-  buffer.fill(0x00);
-  return buffer;
-}
+])
 
 function ensureBuffer(input) {
   if (Buffer.isBuffer(input)) {
     return input;
   }
 
   if (typeof input === "number") {
-    return hasNewBufferAPI ? Buffer.alloc(input) : newEmptyBufferLegacy(input);
+    return Buffer.alloc(input);
   }
   else if (typeof input === "string") {
-    return hasNewBufferAPI ? Buffer.from(input) : new Buffer(input);
+    return Buffer.from(input);
   }
   else {
     throw new Error("input must be buffer, number, or string, received " +
@@ -87,7 +71,7 @@ function ensureBuffer(input) {
 }
 
 function bufferizeInt(num) {
-  var tmp = ensureBuffer(4);
+  const tmp = ensureBuffer(4);
   tmp.writeInt32BE(num, 0);
   return tmp;
 }
@@ -97,7 +81,7 @@ function _crc32(buf, previous) {
   if (Buffer.isBuffer(previous)) {
     previous = previous.readUInt32BE(0);
   }
-  var crc = ~~previous ^ -1;
+  let crc = ~~previous ^ -1;
   for (var n = 0; n < buf.length; n++) {
     crc = CRC_TABLE[(crc ^ buf[n]) & 0xff] ^ (crc >>> 8);
   }

package.json

@@ -22,16 +22,16 @@
   },
   "main": "index.js",
   "scripts": {
-    "test": "./node_modules/.bin/tap tests/*.test.js"
+    "test": "tap tests/*.test.js --reporter classic"
   },
   "type": "commonjs",
   "dependencies": {},
   "devDependencies": {
-    "tap": "~0.2.5"
+    "tap": "~13.1.11"
   },
   "optionalDependencies": {},
   "engines": {
-    "node": "*"
+    "node": ">=8.0.0"
   },
   "license": "MIT",
   "files": [

tests/crc.test.js

@@ -1,5 +1,5 @@
-var crc32 = require('..');
-var test = require('tap').test;
+const crc32 = require('..');
+const test = require('tap').test;
 
 test('simple crc32 is no problem', function (t) {
   var input = new Buffer('hey sup bros');