readcosave

# Imports ---------------------------------------------------------------------
import struct
import io

path = 'Save70_A3AA8A36M4C696C6C79_Commonwealth_010659_20170908034503_16_2.f4se'

class FileReader(io.FileIO):
    """File-object with convenience reading functions."""

    def unpack(self, fmt):
        return struct.unpack(fmt, self.read(struct.calcsize(fmt)))

    def readUByte(self): return struct.unpack('B', self.read(1))[0]
    def readUInt16(self): return struct.unpack('H', self.read(2))[0]
    def readUInt32(self): return struct.unpack('I', self.read(4))[0]

    def readByte(self): return struct.unpack('b', self.read(1))[0]
    def readInt16(self): return struct.unpack('h', self.read(2))[0]
    def readInt32(self): return struct.unpack('i', self.read(4))[0]

    def readSig(self): return struct.unpack('4s', self.read(4))[0]
    def readString8(self): return self.read(struct.unpack('B', self.read(1))[0])
    def readString16(self): return self.read(struct.unpack('H', self.read(2))[0])
    def readString32(self): return self.read(struct.unpack('I', self.read(4))[0])

def readChunk(file):
    chunkType = FileReader.readSig(file).decode("utf-8")
    chunkVersion = FileReader.readInt32(file)
    chunkLength = FileReader.readInt32(file)
    chunkData = file.read(chunkLength)
    chunkValue = []
    chunkValue.append(chunkType)
    chunkValue.append(chunkVersion)
    chunkValue.append(chunkLength)
    chunkValue.append(chunkData)
    print (chunkValue)
    return chunkValue

def readChunks(file):
    opcodeBase = FileReader.readInt32(file)
    numChunks = FileReader.readInt32(file)
    pluginLength = FileReader.readInt32(file)
    chunkBlock = []
    for x in range(numChunks):
        chunkBlock.append(readChunk(file))
    return chunkBlock


def main():
    """Main function, fires everything off."""
    cosave_file = open(path,'rb')
    signature = FileReader.readSig(cosave_file).decode("utf-8")
    formatVersion = FileReader.readInt32(cosave_file)
    obseVersion = FileReader.readInt16(cosave_file)
    obseMinorVersion = FileReader.readInt16(cosave_file)
    oblivionVersion = FileReader.readInt32(cosave_file)
    numPlugins = FileReader.readInt32(cosave_file)

    print ("Signature: ", signature)
    print ("formatVersion: ", formatVersion)
    print ("obseVersion : ", obseVersion)
    print ("obseMinorVersion: ", obseMinorVersion)
    print ("oblivionVersion: ", oblivionVersion)
    print ("numPlugins: ", numPlugins)
    for x in range(numPlugins):
        readChunks(cosave_file)
    cosave_file.close()

if __name__=='__main__':
    main()