function ShowFile(input) { let inputFileObject = input.files[0]; let reader = new FileReader().readAsArrayBuffer(inputFileObject); // alert(`File name: ${inputFileObject.name}`); // alert(`Last modified: ${inputFileObject.lastModified}`); alert(`File: ${inputFileObject}`); } // main input tag file function function LoadSaveFile(input) { // 1. read file // The ArrayBuffer object is used to represent a generic, fixed-length raw binary data buffer. // It is an array of bytes, often referred to in other languages as a "byte array". // new FileReader() // readAsArrayBuffer(file) // addEventListener("load", function) - to decode the file when loaded // 2. Decode file // The slice() method copies up to, but not including, the byte indicated by the end parameter. // Uint8Array(ArrayBuffer) // ArrayBuffer.slice() // remove C# header (ArrayBuffer) // base64 Decoding (ArrayBuffer) // AES decryption (ECB) removes pkcs7 padding (ArrayBuffer) // Convert ArrayBuffer to string/text TextDecoder().decode(ArrayBuffer) // 3. Convert file to JSON string (optional?) // JSON.stringify(JSON.parse(decrypted), undefined, 2) // 4. Paste decoded string file to text area }