Gen Proto BanG Dream

## README.md

      
        

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              README.md
            
          
        
      
    
  
    This is the code rewritten in Python 3 from the original code of esterTion's PHP version

  

  

## genProto.py
from struct import unpack
import re
import sys

dumpcs = open('dump.cs').read()
prog = open('libil2cpp.so', 'rb')

definedClass = []
targetClass = sys.argv[1] #'SuiteMasterGetResponse'  # change to get different classes
outputPath = './{}.proto'.format(targetClass)
outputFile = open(outputPath, 'w')
# write first line
outputFile.write('syntax = "proto2";\n')

typeMap = {
  'uint': 'uint32',
  'string': 'string',
  'ulong': 'uint64',
  'float': 'float',
  'int': 'int32',
  'double': 'double',
  'bool': 'bool',
  'long': 'int64'
}

def getTag(address):
  offset = address & 0xFFFFFFFF

  prog.seek(offset)
  inst = prog.read(4)
  inst = int.from_bytes(inst, byteorder='little', signed=False)
  if inst == 0xe5900004: #0x080440f9:
    prog.seek(offset + 4)
    retnum = int.from_bytes(prog.read(2), 'little', signed=False)
    rotate_flag = int.from_bytes(prog.read(1), 'little', signed=False)
    if rotate_flag == 0xA0:
      # rotate tag number
      rotate_num = (retnum >> 8) & 0xF
      tag = retnum & 0xFF
      for i in range(rotate_num * 2):
        tag = rotr(tag, 32)
      return tag
    return retnum & 0xfff
  elif inst == 0xe92d4c10:
    prog.seek(offset + 12)
    return int.from_bytes(prog.read(2), 'little', signed=False) & 0xfff
  else:
    print(hex(inst), hex(address))

def rotr(num, bits):
    num &= (2**bits-1)
    bit = num & 1
    num >>= 1
    if(bit):
        num |= (1 << (bits-1))

    return num

def writeMessage(target, message):
  outputFile.write('message {} {{\n'.format(target))
  for item, info in message.items():
    typ = info[0]
    if type(info[1]).__name__ == 'str':
      tag = getTag(int(info[1], 16))
    else:
      tag = info[1]
    hint = info[2]
    comment = info[3]
    if hint == 'map':
      outputFile.write('  {}{} {} = {};\n'.format(hint, typ, item, tag))
    else:
      outputFile.write('  {} {} {} = {};\n'.format(hint, typ, item, tag))
  outputFile.write('}\n')

def readClass(level, target):
  try:
    definedClass.index(target)
    shownClass = True
  except ValueError:
    definedClass.append(target)
    shownClass = False

  message = {}
  classDef = re.search('\[ProtoContractAttribute\].*?\n.*?class ' + target + ' [^\{\}]*?\{((.*\n)*?)?\s+(//\s+Properties(.*\n)*?)?\s+(//\s+Methods(.*\n)*?)?\}\s*?', dumpcs)
  if not classDef:
    print('{} not found'.format(target))
  else:
    propList = re.findall('(\[ProtoMemberAttribute\] //.*Offset: 0x([0-9A-F]+)\n	\w+ ([^\ \<]+(\<(.*?)\>)?) ([^\ ;]+))', classDef[0])
    for prop in propList:
      typ = jumpTyp(level, prop[2], prop[5])
      message[typ[0]] = [typ[1], prop[1], typ[2], typ[3]]
    if not shownClass:
      # print('{} \n'.format(target))
      writeMessage(target, message)

def jumpTyp(level, typ, name):
  if typ[-2:] == '[]':
    sub = jumpTyp(level + 2, typ[0:-2], 'entry')
    return [name, sub[1], 'repeated', 'array']
  elif typ[0:11] == 'Dictionary`':
    subType = re.search('<(\w+), (\w+)>', typ)
    readClass(level + 1, subType[2])
    # prefix = '{}_{}'.format(subType[1], subType[2])

    # try:
    #   definedClass.index(prefix)
    #   shownClass = True
    # except ValueError:
    #   definedClass.append(prefix)
    #   shownClass = False
    # message = {}
    # sub = jumpTyp(level + 1, subType[1], '{}_key'.format(prefix))
    # message[sub[0]] = [sub[1], 1, sub[2], sub[3]]
    # sub = jumpTyp(level + 1, subType[2], '{}_value'.format(prefix))
    # message[sub[0]] = [sub[1], 2, sub[2], sub[3]]
    # if not shownClass:
    #   writeMessage(prefix, message)
    return [name, '<{}, {}>'.format(typeMap.get(subType[1], subType[1]), typeMap.get(subType[2], subType[2])), 'map', 'dictionary']
  elif typ[0:5] == 'List`':
    subType = re.search('<(\w+)>', typ)
    sub = jumpTyp(level + 1, subType[1], 'entry')
    return [name, sub[1], 'repeated', 'list']
  elif typ[0:9] == 'Nullable`':
    subType = re.search('<(\w+)>', typ)
    sub = jumpTyp(level, subType[1], name)
    sub[3] = 'nullable'
    return sub
  else:
    expectTyp = ['uint','string','ulong','float','int','double', 'bool','long']
    try:
      expectTyp.index(typ)
      isType = True
    except ValueError:
      expectTyp.append(typ)
      isType = False

    if isType:
      return [name, typeMap[typ], 'optional', 'normal type']
    else:
      readClass(level + 1, typ)
      return [name, typ, 'optional', 'sub class']

readClass(0, targetClass)