Add apploader.img for Swiss IGR

See: emukidid/swiss-gc@3e351a7
Co-authored-by: Extrems <[email protected]>

README.md

@@ -7,6 +7,7 @@ Supported targets:
 - Qoob Pro and Qoob SX
 - ViperGC and ViperGC Extreme
 - Savegame exploits
+- Swiss in-game reset (IGR)
 
 ## Usage
 
@@ -129,6 +130,12 @@ It will be saved as `boot.dol` and can be used in conjunction with the various
 
 [GCMM]: https://github.com/suloku/gcmm
 
+### Swiss in-game reset (IGR)
+
+1. Copy the contents of the `swiss_igr` folder to your SD card,
+   retaining the directory structure.
+1. In Swiss, go to global game settings, and set in-game reset to "Apploader".
+
 
 ## Troubleshooting
 

buildtools/dol2ipl.py

@@ -3,6 +3,7 @@
 import math
 import struct
 import sys
+import zlib
 
 # bootrom descrambler reversed by segher
 def scramble(data, *, qoobsx=False):
@@ -212,6 +213,25 @@ def main():
 
         out = img
 
+    elif output.endswith(".img"):
+        if entry != 0x81300000 or load != 0x01300000:
+            print("Invalid entry point and base address (must be 0x81300000)")
+            return -1
+
+        date = "*gekkoboot"
+        assert date < "2004/02/01"
+
+        header_size = 32
+        header = struct.pack(
+            "> 16s 8x I I",
+            str.encode(date),
+            len(img),
+            zlib.crc32(img)
+        )
+        assert len(header) == header_size
+
+        out = header + img
+
     else:
         print("Unknown output format")
         return -1

meson.build

@@ -178,4 +178,14 @@ gci = custom_target(
     install_dir: '/',
 )
 
+apploader = custom_target(
+    'apploader',
+    input: gekkoboot_dol,
+    output: 'apploader.img',
+    command: [dol2ipl, '@OUTPUT@', '@INPUT@'],
+    build_by_default: true,
+    install: true,
+    install_dir: '/swiss_igr/swiss/patches',
+)
+
 install_data('README.md', install_dir: '/')