Refactor the core's handling of firmware and BIOS images to rely less on the file system (#1826)

* Introduce firmware-related structs

* Fix some indents

* Move the generated firmware identifier to a constant

* Document the WifiAccessPoint constructors

* Add some constants

* Remove a stray comment

* Implement Firmware::UserData

* Add Firmware::Mask

* Document Firmware::Buffer

* Add a Firmware constructor that uses a FileHandle

* Set the default username in UserData

* Update the UserData checksum

* Forgot to include Platform.h

* Remove some redundant assignments in the default Firmware constructor

* const-ify CRC16

* Replace the plain Firmware buffer with a Firmware object

- Remove some functions that were reimplemented in the Firmware constructors

* Fix some crashes due to undefined behavior

* Fix the user data initialization

- Initialize both user data objects to default
- Set both user data objects to the same touch screen calibration

* Follow the DS logic in determining which user data section is current

* Remove an unneeded include

* Remove another unneeded include

* Initialize FirmwareMask in Firmware::Firmware

* Use the DEFAULT_SSID constant

* Add SPI_Firmware::InstallFirmware and SPI_Firmware::RemoveFirmware

* Move a logging call to after the file is written

* Add a SaveManager for the firmware

* Touch up the SPI_Firmware::Firmware declaration

* Move all firmware loading and customization to the frontend

* Call Platform::WriteFirmware when it's time to write the firmware back to disk

* Fix some missing stuff

* Remove the Get* functions from SPI_Firmware in favor of GetFirmware()

* Implement SPI_Firmware::DeInit in terms of RemoveFirmware

* Add Firmware::UpdateChecksums

* Fix an incorrect length

* Update all checksums in the firmware after setting touch screen calibration data

* Use the Firmware object's Position methods

* Remove register fields from the Firmware object

* Install the firmware before seeing if direct boot is necessary

* Install the firmware before calling NDS::Reset in LoadROM

* Slight cleanup in ROMManager

* Fix the default access point name

* Shorten the various getters in Firmware

* Add qualifiers for certain uses of firmware types

- GCC can get picky if -fpermissive isn't defined

* Add an InstallFirmware overload that takes a unique_ptr

* Log when firmware is added or removed

* Don't clear the firmware in SPI_Firmware::Init

- The original code didn't, it just set the pointer to nullptr

* Fix a typo

* Write back the full firmware if it's not generated

* Move the FreeBIOS to an external file

* Load wfcsettings.bin into the correct part of the generated firmware blob

* Load BIOS files in the frontend, not in the core

* Fix logging the firmware ID

* Add some utility functions

* Mark Firmware's constructors as explicit

* Remove obsolete ConfigEntry values

* Include <locale> explicitly in ROMManager

* Fix up some includes

* Add Firmware::IsBootable()

* Add a newline to a log entry

- Whoops

* Log the number of bytes written out in SaveManager

* Mark FirmwareHeader's constructor as explicit

* Clean up GenerateDefaultFirmware and LoadFirmwareFromFile

- Now they return a pair instead of two by-ref values

* Refactor SaveManager a little bit

- Manage its buffers as unique_ptrs to mitigate leaks
- Reallocate the internal buffer if SetPath is asked to reload the file (and the new length is different)

* Remove some stray parens

* Fix some firmware-related bugs I introduced

- Firmware settings are now properly saved to disk (beforehand I misunderstood when the firmware blob was written)
- Firmware is no longer overwritten by contents of wfcsettings.bin

* Slight cleanup

src/DSi_NWifi.cpp

@@ -147,6 +147,7 @@ DSi_NWifi::~DSi_NWifi()
 
 void DSi_NWifi::Reset()
 {
+    using namespace SPI_Firmware;
     TransferCmd = 0xFFFFFFFF;
     RemSize = 0;
 
@@ -163,26 +164,26 @@ void DSi_NWifi::Reset()
     for (int i = 0; i < 9; i++)
         Mailbox[i].Clear();
 
-    u8* mac = SPI_Firmware::GetWifiMAC();
+    MacAddress mac = GetFirmware()->Header().MacAddress;
     Log(LogLevel::Info, "NWifi MAC: %02X:%02X:%02X:%02X:%02X:%02X\n",
            mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
 
-    u8 type = SPI_Firmware::GetNWifiVersion();
+    WifiBoard type = GetFirmware()->Header().WifiBoard;
     switch (type)
     {
-    case 1: // AR6002
+    case WifiBoard::W015: // AR6002
         ROMID = 0x20000188;
         ChipID = 0x02000001;
         HostIntAddr = 0x00500400;
         break;
 
-    case 2: // AR6013
+    case WifiBoard::W024: // AR6013
         ROMID = 0x23000024;
         ChipID = 0x0D000000;
         HostIntAddr = 0x00520000;
         break;
 
-    case 3: // AR6014 (3DS)
+    case WifiBoard::W028: // AR6014 (3DS)
         ROMID = 0x2300006F;
         ChipID = 0x0D000001;
         HostIntAddr = 0x00520000;
@@ -190,7 +191,7 @@ void DSi_NWifi::Reset()
         break;
 
     default:
-        Log(LogLevel::Warn, "NWifi: unknown hardware type, assuming AR6002\n");
+        Log(LogLevel::Warn, "NWifi: unknown hardware type 0x%x, assuming AR6002\n", static_cast<u8>(type));
         ROMID = 0x20000188;
         ChipID = 0x02000001;
         HostIntAddr = 0x00500400;
@@ -201,7 +202,7 @@ void DSi_NWifi::Reset()
 
     *(u32*)&EEPROM[0x000] = 0x300;
     *(u16*)&EEPROM[0x008] = 0x8348; // TODO: determine properly (country code)
-    memcpy(&EEPROM[0x00A], mac, 6);
+    memcpy(&EEPROM[0x00A], mac.data(), mac.size());
     *(u32*)&EEPROM[0x010] = 0x60000000;
 
     memset(&EEPROM[0x03C], 0xFF, 0x70);
@@ -894,8 +895,9 @@ void DSi_NWifi::HTC_Command()
 
     case 0x0004: // setup complete
         {
+            SPI_Firmware::MacAddress mac = SPI_Firmware::GetFirmware()->Header().MacAddress;
             u8 ready_evt[12];
-            memcpy(&ready_evt[0], SPI_Firmware::GetWifiMAC(), 6);
+            memcpy(&ready_evt[0], &mac, mac.size());
             ready_evt[6] = 0x02;
             ready_evt[7] = 0;
             *(u32*)&ready_evt[8] = 0x2300006C;