tools: made a script to transpile the c# decompiled structs
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#!/bin/python
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'''
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genstructs.py - gopenfusion
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Takes raw structures from a decompiled 'Assembly - CSharp.dll' from a main.unity3d fusionfall beta client,
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and transpiles them to gopenfusion's custom packet structure & tags. This requires a compiler installed,
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since struct field padding is grabbed via the `offsetof()` C macro. Some manual rearranging of structures
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from the disassembled source might be needed. This script can also be used to generate c-style structures
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(because it already does!)
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usage: ./genstructs.py [IN.cs] > out.go
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'''
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from distutils.ccompiler import new_compiler
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import subprocess
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import sys
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import os
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PACK_ALIGN = 4
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def sanitizeName(name: str) -> str:
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# all exported fields in go must start capitalized
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return name[0:2].upper() + name[2:]
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def writeToFile(source: str, filePath: str) -> None:
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with open(filePath, "w") as out:
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out.write(source)
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class StructTranspiler:
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class StructField:
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def __init__(self, name: str, type: str, marshal: str) -> None:
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self.marshal = marshal
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self.type = type
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self.ctype = type # for transpilation to c
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self.tags = ""
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self.size = 0
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self.padding = 0
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self.name = sanitizeName(name)
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self.cname = self.name
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self.needsPatching = False
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if type == "byte":
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self.type = "uint8"
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self.ctype = "char"
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self.size = 1
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elif type == "sbyte":
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self.type = "int8"
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self.ctype = "char"
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self.size = 1
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elif type == "short":
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self.type = "int16"
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self.ctype = "short"
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self.size = 2
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elif type == "int":
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self.type = "int32"
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self.ctype = "int"
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self.size = 4
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elif type == "uint":
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self.type = "uint32"
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self.ctype = "int"
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self.size = 4
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elif type == "float":
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self.type = "float32"
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self.ctype = "float"
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self.size = 4
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elif type == "long":
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self.type = "int64"
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self.ctype = "long"
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self.size = 8
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elif type == "ulong":
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self.type = "uint64"
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self.ctype = "long"
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self.size = 8
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elif type == "byte[]":
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self.size = int(marshal[(marshal.find("SizeConst = ") + len("SizeConst = ")):marshal.find(")]")])
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self.type = "[%d]byte" % self.size
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self.ctype = "char"
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self.cname += "[%d]" % self.size
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elif type == "int[]":
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self.size = int(marshal[(marshal.find("SizeConst = ") + len("SizeConst = ")):marshal.find(")]")])
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self.type = "[%d]int32" % self.size
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self.ctype = "int"
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self.cname += "[%d]" % self.size
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self.size *= 4
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elif type == "short[]":
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self.size = int(marshal[(marshal.find("SizeConst = ") + len("SizeConst = ")):marshal.find(")]")])
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self.type = "[%d]int16" % self.size
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self.ctype = "short"
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self.cname += "[%d]" % self.size
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self.size *= 2
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elif type == "long[]":
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self.size = int(marshal[(marshal.find("SizeConst = ") + len("SizeConst = ")):marshal.find(")]")])
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self.type = "[%d]int64" % self.size
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self.ctype = "long"
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self.cname += "[%d]" % self.size
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self.size *= 8
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elif type == "float[]":
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self.size = int(marshal[(marshal.find("SizeConst = ") + len("SizeConst = ")):marshal.find(")]")])
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self.type = "[%d]float32" % self.size
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self.ctype = "float"
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self.cname += "[%d]" % self.size
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self.size *= 4
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elif type == "string":
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# all strings in fusionfall are utf16, in a uint16 array
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self.size = int(marshal[(marshal.find("SizeConst = ") + len("SizeConst = ")):marshal.find(")]")])
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self.type = "string"
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self.tags += "size:\"%d\"" % self.size
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self.ctype = "short"
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self.cname += "[%d]" % self.size
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self.size *= 2
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else:
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# assume it's a structure that will be defined later
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if type.find("[]") != -1:
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type = type.replace("[]", "")
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self.size = int(marshal[(marshal.find("SizeConst = ") + len("SizeConst = ")):marshal.find(")]")])
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self.cname = name + "[%d]" % self.size
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else:
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self.cname = name
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self.size = 1
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self.name = name
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self.type = sanitizeName(type)
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self.ctype = sanitizeName(type)
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self.needsPatching = True
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def __init__(self, lines: list[str]) -> None:
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self.name = "UnknownStruct"
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self.size = 0
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self.fields: list[self.StructField] = []
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self.lines = lines
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self.cursor = 0
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def getLine(self) -> str:
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return self.lines[self.cursor]
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def getNextLine(self) -> str:
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self.cursor += 1
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return self.lines[self.cursor]
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def needsPatching(self) -> int:
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for i in range(len(self.fields)):
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if self.fields[i].needsPatching:
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return i
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return -1
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# skip lines until we run into a '[StructLayout('
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def searchStructLayout(self) -> None:
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line = self.getLine()
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while True:
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if line.find("[StructLayout(") != -1 and line.find("Size = ") != -1:
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self.size = int(line[(line.find("Size = ") + len("Size = ")):line.find(")]")])
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line = self.getNextLine()
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self.name = sanitizeName(line[(line.find("public struct ") + len("public struct ")):len(line)-1])
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self.getNextLine()
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return
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line = self.getNextLine()
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# skip lines until we find a struct field
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def searchMarshal(self) -> StructField:
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line = self.getLine()
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while line.find("}") == -1:
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if line.find("[MarshalAs(") != -1:
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marshal = line
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line = self.getNextLine()
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typeStart = line.find("public ") + len("public ")
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typeEnd = line.find(" ", typeStart)
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type = line[typeStart:typeEnd]
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name = line[typeEnd+1:line.find(";", typeEnd)]
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return self.StructField(name, type, marshal)
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line = self.getNextLine()
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return None
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def toCStyle(self) -> str:
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source = "typedef struct {\n"
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for field in self.fields:
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source += "\t%s %s;\n" % (field.ctype, field.cname)
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source += "} %s;\n" % self.name
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for field in self.fields:
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source += "printf(\"%d \""
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source += ", offsetof(%s, %s));\n" % (self.name, field.name)
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source += "printf(\"\\n\");\n"
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return source
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def populatePadding(self, offsets: list[str]) -> None:
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currentSize = 0
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for i in range(len(self.fields)):
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currentSize += self.fields[i].size
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if i < len(self.fields)-1 and currentSize != int(offsets[i+1]):
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self.fields[i].padding = int(offsets[i+1]) - currentSize
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currentSize += self.fields[i].padding
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if currentSize < self.size:
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self.fields[len(self.fields)-1].padding = self.size - currentSize
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def parseStructure(self) -> None:
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self.searchStructLayout()
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line = self.getLine()
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while line.find("}") == -1:
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field = self.searchMarshal()
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if field != None:
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self.fields.append(field)
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line = self.getLine()
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def toGoStyle(self) -> str:
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source = "type " + self.name + " struct {"
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currentSize = 0
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for field in self.fields:
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currentSize += field.size
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if field.padding > 0:
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currentSize += field.padding
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field.tags += " pad:\"%d\"" % field.padding
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source += "\n\t" + field.name + " " + field.type
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if len(field.tags) > 0:
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source += " `" + field.tags + "`"
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if currentSize != self.size:
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source += "\n// WARNING: computed size is %d, needs to be %d!!" % (currentSize, self.size)
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else:
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source += "\n// SIZE: %d" % self.size
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source += "\n}\n"
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return source
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if __name__ == '__main__':
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inFilePath = sys.argv[1]
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iFile = open(inFilePath, "r")
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lines = iFile.readlines()
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structs: list[StructTranspiler] = []
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while True:
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try:
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struct = StructTranspiler(lines)
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struct.parseStructure()
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structs.append(struct)
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lines = struct.lines[struct.cursor:]
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except:
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break
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for i in range(len(structs)):
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struct = structs[i]
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f = struct.needsPatching()
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while f != -1:
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name = struct.fields[f].type
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for s in structs:
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if s.name == name:
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if struct.fields[f].size > 1:
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structs[i].fields[f].type = ("[%d]" % struct.fields[f].size) + struct.fields[f].type
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structs[i].fields[f].size *= s.size
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structs[i].fields[f].needsPatching = False
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f = struct.needsPatching()
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# we compile a small c program to grab the exact offsets and alignments
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source = "#include <stdio.h>\n#include <stddef.h>\n"
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source += "int main() {\n"
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source += "#pragma pack(push)\n#pragma pack(%d)\n" % PACK_ALIGN
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for struct in structs:
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source += struct.toCStyle()
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source += "#pragma pack(pop)\nreturn 0;\n}\n"
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writeToFile(source, "tmp.c")
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compiler = new_compiler()
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compiler.compile(['tmp.c'])
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compiler.link_executable(['tmp.o'], 'tmp')
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lines = subprocess.getoutput(['./tmp']).splitlines()
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for i in range(len(structs)):
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structs[i].populatePadding(lines[i].split(" "))
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for struct in structs:
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print(struct.toGoStyle())
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os.remove("tmp")
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os.remove("tmp.c")
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os.remove("tmp.o")
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