Added get-architecture

.gitignore

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+/.idea/
+/node_modules/

example.js

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+const getArchitecture = require('.');
+
+(async () => {
+  const arch = await getArchitecture('C:\\Windows\\System32\\cmd.exe');
+  console.log(arch); // 'x64'
+})();

index.js

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+const fs = require('fs');
+
+module.exports = file => {
+  return new Promise((resolve, reject) => {
+    // Check that file is readable
+    fs.access(file, fs.constants.F_OK | fs.constants.R_OK, err => {
+      if (err) {
+        reject(new Error(`${file} ${err.code === 'ENOENT' ? 'does not exist' : 'is not readable'}`));
+      } else {
+        // Open file
+        fs.open(file, 'r', (err, fd) => {
+          if (err) {
+            reject(err);
+          } else {
+            // Determine offset to PE header
+            let buffer = Buffer.alloc(4);
+            fs.read(fd, buffer, 0, 4, 0x3C, err => {
+              if (err) {
+                reject(err);
+              } else {
+                // Read PE header
+                const offset = hexToDec(littleEndian(buffer));
+                buffer = Buffer.alloc(2);
+                fs.read(fd, buffer, 0, 2, offset + 0x18, err => {
+                  if (err) {
+                    reject(err);
+                  } else {
+                    const hex = littleEndian(buffer);
+                    const result = hex === '020b' ? 'x64' : hex === '010b' ? 'x86' : null;
+
+                    if (result === null) {
+                      reject(new Error('Unknown'));
+                    } else {
+                      resolve(result);
+                    }
+                  }
+                });
+              }
+            });
+          }
+        });
+      }
+    });
+  });
+};
+
+function littleEndian(buffer) {
+  return buffer.toString('hex').match(/../g).reverse().join('');
+}
+
+function hexToDec(hex) {
+  return parseInt(hex, 16);
+}

package.json

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+{
+  "name": "get-architecture",
+  "version": "1.0.0",
+  "description": "Binary file architecture detector",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/axelstudios/get-architecture.git"
+  },
+  "main": "./index.js",
+  "files": [
+    "index.js"
+  ],
+  "author": "Alex Swindler <[email protected]>",
+  "engines": {
+    "node": "*"
+  },
+  "scripts": {
+    "lint": "xo --space"
+  },
+  "license": "MIT",
+  "devDependencies": {
+    "xo": "~0.23.0"
+  }
+}

readme.md

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+# get-architecture
+
+A tiny Node utility to detect whether .exe and .dll files are 32 or 64-bit.
+
+## Installation
+
+```bash
+$ npm install get-architecture
+```
+
+## Usage
+
+`get-architecture` exposes a function; simply pass this function the path of a .exe or .dll to test and it will return a promise resolving to `x86`, `x64`, or rejecting with `Unknown`.
+
+```js
+const getArchitecture = require('get-architecture');
+
+(async () => {
+  const arch = await getArchitecture('myFile.exe');
+  console.log(arch); // 'x64'
+})();
+```