Function readMagic

packages/wasm-parser/src/reader/module-reader.ts:18–27

(reader: BinaryReader)

 * @returns Throws a WebAssemblyDecodeError if the magic number does not match the expected value.
 */
export function readMagic(reader: BinaryReader) {
  const startOffset = reader.currentOffset;
  const magic = reader.readBytes(4);
  if (!arrayBuffersEqual(MAGIC, magic)) {
    throw new WebAssemblyDecodeError(
      'Specified module is not a valid binary WebAssembly module',
      startOffset
    );
  }
}

/**
 * Reads and returns a 32-bit unsigned integer representing the version