Flipper Zero Dolphin state decode

dolphin_decode.dart

import 'dart:typed_data';
import 'dart:convert';

main() {
  final foo = Uint8List.fromList(data);
  final checksum = Uint8List(1);
  for (int i = 8; i < foo.length; i++) {
    checksum[0] += foo[i];
  }
  print('checksum: $checksum  -> 0x${checksum[0].toRadixString(16)}');

  printData(foo);
  printData(Uint8List.fromList(data2));
}

printData(Uint8List data) {
  final b = data.buffer.asByteData();
  final map = {
    'magic': b.getUint8(0),
    'version': b.getUint8(1),
    'checksum': b.getUint8(2),
    'flags': b.getUint8(3),
    'timestamp': b.getUint32(4),
    'dailyLimits': {
      'subGhz': b.getUint8(8),
      'rfid': b.getUint8(9),
      'nfc': b.getUint8(10),
      'ir': b.getUint8(11),
      'iButton': b.getUint8(12),
      'badUsb': b.getUint8(13),
      'u2f': b.getUint8(14),
      'butthurt': b.getUint8(15),
    },
    'flags32': b.getUint32(16, Endian.little),
    'iCounter32': b.getUint32(20, Endian.little),
    'butthurt32': b.getInt32(24, Endian.little),
    'timestamp64': ((BigInt.from(b.getUint32(28, Endian.little)) << 32) |
            BigInt.from(b.getUint32(32, Endian.little)))
        .toString(),
  };
  print(JsonEncoder.withIndent('  ').convert(map));
}

final data = [
  0xD0, // magic   - begin header
  0x01, // version
  0x1D, // checksum (all bytes of data added together)
  0x00, // flags (0)
  0x00, // timestamp
  0x00, //  "
  0x00, //  "
  0x00, //  "  - end of header
  // Daily Limits
  0x0F, // SubGhz
  0x02, // Rfid
  0x0F, // Nfc
  0x00, // Ir
  0x00, // Ibutton
  0x00, // BadUsb
  0x00, // U2F
  ///
  0x20, // butthurt Daily limit?
  0x00, // flags32
  0x00, //   "
  0x00, //   "
  0x00, //   "
  0x45, // icounter32
  0x02, //   "
  0x00, //   "
  0x00, //   "
  0x00, // butthurt i32
  0x00, //   "
  0x00, //   "
  0x00, //   "
  0x00, // timestamp64
  0x00, //   "
  0x00, //   "
  0x00, //   "
  0x38, //   "
  0x78, //   "
  0x86, //   "
  0x62, //   "
  0x00, // dirty (bool)
  0x00, // ?
  0x00, // ?
  0x00, // ?
];

final data2 = [
  0xD0,
  0x01,
  0x90,
  0x00,
  0x00,
  0x00,
  0x00,
  0x00,
  0x09,
  0x00,
  0x0F,
  0x05,
  0x00,
  0x0F,
  0x09,
  0x2E,
  0x00,
  0x00,
  0x00,
  0x00,
  0xE0,
  0x02,
  0x00,
  0x00,
  0x00,
  0x00,
  0x00,
  0x00,
  0x00,
  0x00,
  0x00,
  0x00,
  0xD2,
  0x84,
  0x93,
  0x62,
  0x00,
  0x00,
  0x00,
  0x00,
];

output.txt

checksum: [31]  -> 0x1f
{
  "magic": 208,
  "version": 1,
  "checksum": 29,
  "flags": 0,
  "timestamp": 0,
  "dailyLimits": {
    "subGhz": 15,
    "rfid": 2,
    "nfc": 15,
    "ir": 0,
    "iButton": 0,
    "badUsb": 0,
    "u2f": 0,
    "butthurt": 32
  },
  "flags32": 0,
  "iCounter32": 581,
  "butthurt32": 0,
  "timestamp64": "1652979768"
}
{
  "magic": 208,
  "version": 1,
  "checksum": 144,
  "flags": 0,
  "timestamp": 0,
  "dailyLimits": {
    "subGhz": 9,
    "rfid": 0,
    "nfc": 15,
    "ir": 5,
    "iButton": 0,
    "badUsb": 15,
    "u2f": 9,
    "butthurt": 46
  },
  "flags32": 0,
  "iCounter32": 736,
  "butthurt32": 0,
  "timestamp64": "1653834962"
}

Flashing my own version of the firmware erased my data; I had a saved state from last week, but I knew about where the "xp" bar was - so this is how you do it...