Initial commit

2026-07-27 13:37:48 +08:00
commit ecba71e2a5
39123 changed files with 5989154 additions and 0 deletions
@@ -0,0 +1,29 @@
+import { Transform } from "readable-stream";
+import crc32 from "crc-32";
+
+export default class CRC32Stream extends Transform {
+  constructor(options) {
+    super(options);
+    this.checksum = Buffer.allocUnsafe(4);
+    this.checksum.writeInt32BE(0, 0);
+    this.rawSize = 0;
+  }
+  _transform(chunk, encoding, callback) {
+    if (chunk) {
+      this.checksum = crc32.buf(chunk, this.checksum) >>> 0;
+      this.rawSize += chunk.length;
+    }
+    callback(null, chunk);
+  }
+  digest(encoding) {
+    const checksum = Buffer.allocUnsafe(4);
+    checksum.writeUInt32BE(this.checksum >>> 0, 0);
+    return encoding ? checksum.toString(encoding) : checksum;
+  }
+  hex() {
+    return this.digest("hex").toUpperCase();
+  }
+  size() {
+    return this.rawSize;
+  }
+}