Deliaz · April 8, 2019 05:22 · Apr 8, 2019
diff --git a/crxver.js b/crxver.js
@@ -0,0 +1,19 @@
+#!/usr/bin/env node
+const fs = require('fs');
+
+const filePath = process.argv[2];
+if(!filePath) {
+        console.error('No file specified.\nUsage:\n\tnode crxver.js my-extensions.crx\n');
+        process.exit(-1);
+}
+
+const buf = fs.readFileSync(filePath);
+
+const VERSION_POS_BYTE_OFFSET = 4;
+const VERSION_LENGTH_BYTE = 1;
+
+const type = buf.subarray(0, 4).toString('ascii');
+const version = buf.readIntBE(VERSION_POS_BYTE_OFFSET, VERSION_LENGTH_BYTE).toString(16);
+
+console.log('File type:\t', type);
+console.log('Version:\t', version);