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.cpp

@@ -548,12 +548,12 @@ void SetupDirectBoot()
             DSi_NAND::DeInit();
         }
 
-        u8 nwifiver = SPI_Firmware::GetNWifiVersion();
-        ARM9Write8(0x020005E0, nwifiver);
+        SPI_Firmware::WifiBoard nwifiver = SPI_Firmware::GetFirmware()->Header().WifiBoard;
+        ARM9Write8(0x020005E0, static_cast<u8>(nwifiver));
 
         // TODO: these should be taken from the wifi firmware in NAND
         // but, hey, this works too.
-        if (nwifiver == 1)
+        if (nwifiver == SPI_Firmware::WifiBoard::W015)
         {
             ARM9Write16(0x020005E2, 0xB57E);
             ARM9Write32(0x020005E4, 0x00500400);
@@ -726,64 +726,6 @@ void SoftReset()
     GPU::DispStat[1] |= (1<<6);
 }
 
-bool LoadBIOS()
-{
-    Platform::FileHandle* f;
-    u32 i;
-
-    memset(ARM9iBIOS, 0, 0x10000);
-    memset(ARM7iBIOS, 0, 0x10000);
-
-    f = Platform::OpenLocalFile(Platform::GetConfigString(Platform::DSi_BIOS9Path), FileMode::Read);
-    if (!f)
-    {
-        Log(LogLevel::Warn, "ARM9i BIOS not found\n");
-
-        for (i = 0; i < 16; i++)
-            ((u32*)ARM9iBIOS)[i] = 0xE7FFDEFF;
-    }
-    else
-    {
-        FileRewind(f);
-        FileRead(ARM9iBIOS, 0x10000, 1, f);
-
-        Log(LogLevel::Info, "ARM9i BIOS loaded\n");
-        Platform::CloseFile(f);
-    }
-
-    f = Platform::OpenLocalFile(Platform::GetConfigString(Platform::DSi_BIOS7Path), FileMode::Read);
-    if (!f)
-    {
-        Log(LogLevel::Warn, "ARM7i BIOS not found\n");
-
-        for (i = 0; i < 16; i++)
-            ((u32*)ARM7iBIOS)[i] = 0xE7FFDEFF;
-    }
-    else
-    {
-        // TODO: check if the first 32 bytes are crapoed
-
-        FileRewind(f);
-        FileRead(ARM7iBIOS, 0x10000, 1, f);
-
-        Log(LogLevel::Info, "ARM7i BIOS loaded\n");
-        CloseFile(f);
-    }
-
-    if (!Platform::GetConfigBool(Platform::DSi_FullBIOSBoot))
-    {
-        // herp
-        *(u32*)&ARM9iBIOS[0] = 0xEAFFFFFE;
-        *(u32*)&ARM7iBIOS[0] = 0xEAFFFFFE;
-
-        // TODO!!!!
-        // hax the upper 32K out of the goddamn DSi
-        // done that :)  -pcy
-    }
-
-    return true;
-}
-
 bool LoadNAND()
 {
     Log(LogLevel::Info, "Loading DSi NAND\n");