parse_fxp_ctypes.py

import gzip
import os
import re
import xml.etree.cElementTree as etree

from ctypes import *


VstInt32 = c_int32.__ctype_be__
VstFloat = c_float.__ctype_be__


class fxProgram_content_data(Structure):
    _fields_ = [
        ("size", VstInt32),
    ]

class fxProgram_content(Union):
    _fields_ = [
        ("data", fxProgram_content_data),
    ]
    

class fxProgram(Structure):
    _fields_ = [
        ("chunkMagic", VstInt32),
        ("byteSize", VstInt32),

        ("fxMagic", VstInt32),
        ("version", VstInt32),
        ("fxID", VstInt32),
        ("fxVersion", VstInt32),

        ("numParams", VstInt32),
        ("prgName", c_char*28),

        ("content", fxProgram_content),
    ]


class fxBank_content_data(Structure):
    _fields_ = [
        ("size", VstInt32),
    ]


class fxBank_content(Union):
    _fields_ = [
        ("programs", fxProgram),
        ("data", fxBank_content_data),
    ]

class fxBank(Structure):
    _fields_ = [
        ("chunkMagic", VstInt32),
        ("byteSize", VstInt32),

        ("fxMagic", VstInt32),
        ("version", VstInt32),
        ("fxID", VstInt32),
        ("fxVersion", VstInt32),

        ("numPrograms", VstInt32),

        ("currentProgram", VstInt32),
        ("future", c_char*124),

        ("content", fxBank_content),
    ]


fname = os.path.expanduser('~/tmp/blackhole_marek.fxp')
f = open(fname, 'rb')
buf = bytearray(f.read())
prog = fxProgram.from_buffer(buf)
chunk = (c_char * prog.content.data.size).from_buffer(buf, sizeof(prog))
print(chunk.value)