Macintosh-Tools/tbxi
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Patch bootscript to match Trampoline when needed

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This allows any Parcels-based bootscript to work with any Parcels-based
Trampoline.
This commit is contained in:
Elliot Nunn 2019-08-02 11:58:57 +08:00
parent b03f960544
commit 27d6e2d77c
1 changed files with 25 additions and 1 deletions
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26
tbxi/bootinfo_build.py
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@ -1,6 +1,7 @@
from os import path
import re
import zlib
import sys
try:
from .fast_lzss import compress
@ -15,6 +16,26 @@ def append_checksum(binary):
binary.extend(cksum)
# Fix a subtle incompatibility between pre/post-v7.8 scripts & trampolines
# (this is ugly)
def edit_bootscript_for_elf(script, tramp):
oldprop = b'AAPL,toolbox-image,lzss'
newprop = b'AAPL,toolbox-parcels'
matrix = (oldprop in script, newprop in script, oldprop in tramp, newprop in tramp)
if matrix == (True, False, False, True):
print('Bootscript older than MacOS.elf (fixing %s => %s)' % (oldprop.decode('ascii'), newprop.decode('ascii')), file=sys.stderr)
script = script.replace(oldprop, newprop)
elif matrix == (False, True, True, False):
print('Bootscript newer than MacOS.elf (fixing %s => %s)' % (newprop.decode('ascii'), oldprop.decode('ascii')), file=sys.stderr)
script = script.replace(newprop, oldprop)
else:
return script
return script
def build(src):
try:
with open(path.join(src, 'Bootscript'), 'rb') as f:
@ -22,6 +43,9 @@ def build(src):
except (NotADirectoryError, FileNotFoundError):
raise dispatcher.WrongFormat
elf = dispatcher.build(path.join(src, 'MacOS.elf'))
booter[:] = edit_bootscript_for_elf(booter, elf)
has_checksum = (b'adler32' in booter)
constants = dict()
@ -42,7 +66,7 @@ def build(src):
booter.extend(b'\0' * (constants['elf-offset'] - len(booter)))
constants['elf-offset'] = len(booter)
booter.extend(dispatcher.build(path.join(src, 'MacOS.elf')))
booter.extend(elf)
constants['elf-size'] = len(booter) - constants['elf-offset']
if 'lzss-offset' in constants: