init

test-crc.js

@@ -0,0 +1,32 @@
+const { crc } = require('node-crc');
+
+const CRC_TABLE = new Uint32Array(256);
+for (let i = 0; i < 256; i++) {
+    let r = i << 24;
+    for (let j = 0; j < 8; j++) {
+        r = (r & 0x80000000) !== 0 ? ((r << 1) ^ 0x04c11db7) : (r << 1);
+    }
+    CRC_TABLE[i] = (r >>> 0);
+}
+
+function calculateOggCrc(buffer) {
+    let crc = 0;
+    for (let i = 0; i < buffer.length; i++) {
+        crc = ((crc << 8) >>> 0) ^ CRC_TABLE[((crc >>> 24) ^ buffer[i]) & 0xff];
+        crc >>>= 0;
+    }
+    return crc;
+}
+
+const testBuffer = Buffer.from("hello world this is a test page", "utf-8");
+
+const expectedBuffer = crc(32, false, 0x04c11db7, 0, 0, 0, 0, 0, testBuffer);
+const expected = expectedBuffer.readUInt32BE(0);
+
+const actual = calculateOggCrc(testBuffer);
+
+console.log({
+    expected: expected.toString(16),
+    actual: actual.toString(16),
+    match: expected === actual
+});