python/capstone/__init__.py

# Capstone Python bindings, by Nguyen Anh Quynnh <aquynh (at] gmail.com>
import sys
from platform import system
_python2 = sys.version_info[0] < 3
if _python2:
    range = xrange

__all__ = [
    'Cs',
    'CsInsn',

    'cs_disasm_quick',
    'cs_disasm_lite',
    'cs_version',
    'cs_support',
    'version_bind',
    'debug',

    'CS_API_MAJOR',
    'CS_API_MINOR',

    'CS_VERSION_MAJOR',
    'CS_VERSION_MINOR',
    'CS_VERSION_EXTRA',

    'CS_ARCH_ARM',
    'CS_ARCH_ARM64',
    'CS_ARCH_MIPS',
    'CS_ARCH_X86',
    'CS_ARCH_PPC',
    'CS_ARCH_SPARC',
    'CS_ARCH_SYSZ',
    'CS_ARCH_XCORE',
    'CS_ARCH_ALL',

    'CS_MODE_LITTLE_ENDIAN',
    'CS_MODE_BIG_ENDIAN',
    'CS_MODE_16',
    'CS_MODE_32',
    'CS_MODE_64',
    'CS_MODE_ARM',
    'CS_MODE_THUMB',
    'CS_MODE_MCLASS',
    'CS_MODE_MICRO',
    'CS_MODE_MIPS3',
    'CS_MODE_MIPS32R6',
    'CS_MODE_MIPSGP64',
    'CS_MODE_V8',
    'CS_MODE_V9',
    'CS_MODE_MIPS32',
    'CS_MODE_MIPS64',

    'CS_OPT_SYNTAX',
    'CS_OPT_SYNTAX_DEFAULT',
    'CS_OPT_SYNTAX_INTEL',
    'CS_OPT_SYNTAX_ATT',
    'CS_OPT_SYNTAX_NOREGNAME',

    'CS_OPT_DETAIL',
    'CS_OPT_MODE',
    'CS_OPT_ON',
    'CS_OPT_OFF',

    'CS_ERR_OK',
    'CS_ERR_MEM',
    'CS_ERR_ARCH',
    'CS_ERR_HANDLE',
    'CS_ERR_CSH',
    'CS_ERR_MODE',
    'CS_ERR_OPTION',
    'CS_ERR_DETAIL',
    'CS_ERR_VERSION',
    'CS_ERR_MEMSETUP',
    'CS_ERR_DIET',
    'CS_ERR_SKIPDATA',
    'CS_ERR_X86_ATT',
    'CS_ERR_X86_INTEL',

    'CS_SUPPORT_DIET',
    'CS_SUPPORT_X86_REDUCE',
    'CS_SKIPDATA_CALLBACK',

    'CS_OP_INVALID',
    'CS_OP_REG',
    'CS_OP_IMM',
    'CS_OP_MEM',
    'CS_OP_FP',

    'CS_GRP_INVALID',
    'CS_GRP_JUMP',
    'CS_GRP_CALL',
    'CS_GRP_RET',
    'CS_GRP_INT',
    'CS_GRP_IRET',

    'CsError',

    '__version__',
]

# Capstone C interface

# API version
CS_API_MAJOR = 3
CS_API_MINOR = 0

# Package version
CS_VERSION_MAJOR = CS_API_MAJOR
CS_VERSION_MINOR = CS_API_MINOR
CS_VERSION_EXTRA = 5

__version__ = "%u.%u.%u" %(CS_VERSION_MAJOR, CS_VERSION_MINOR, CS_VERSION_EXTRA)

# architectures
CS_ARCH_ARM = 0
CS_ARCH_ARM64 = 1
CS_ARCH_MIPS = 2
CS_ARCH_X86 = 3
CS_ARCH_PPC = 4
CS_ARCH_SPARC = 5
CS_ARCH_SYSZ = 6
CS_ARCH_XCORE = 7
CS_ARCH_MAX = 8
CS_ARCH_ALL = 0xFFFF

# disasm mode
CS_MODE_LITTLE_ENDIAN = 0      # little-endian mode (default mode)
CS_MODE_ARM = 0                # ARM mode
CS_MODE_16 = (1 << 1)          # 16-bit mode (for X86)
CS_MODE_32 = (1 << 2)          # 32-bit mode (for X86)
CS_MODE_64 = (1 << 3)          # 64-bit mode (for X86, PPC)
CS_MODE_THUMB = (1 << 4)       # ARM's Thumb mode, including Thumb-2
CS_MODE_MCLASS = (1 << 5)      # ARM's Cortex-M series
CS_MODE_V8 = (1 << 6)          # ARMv8 A32 encodings for ARM
CS_MODE_MICRO = (1 << 4)       # MicroMips mode (MIPS architecture)
CS_MODE_MIPS3 = (1 << 5)       # Mips III ISA
CS_MODE_MIPS32R6 = (1 << 6)    # Mips32r6 ISA
CS_MODE_MIPSGP64 = (1 << 7)    # General Purpose Registers are 64-bit wide (MIPS arch)
CS_MODE_V9 = (1 << 4)          # Sparc V9 mode (for Sparc)
CS_MODE_BIG_ENDIAN = (1 << 31) # big-endian mode
CS_MODE_MIPS32 = CS_MODE_32    # Mips32 ISA
CS_MODE_MIPS64 = CS_MODE_64    # Mips64 ISA

# Capstone option type
CS_OPT_SYNTAX = 1    # Intel X86 asm syntax (CS_ARCH_X86 arch)
CS_OPT_DETAIL = 2    # Break down instruction structure into details
CS_OPT_MODE = 3      # Change engine's mode at run-time
CS_OPT_MEM = 4       # Change engine's mode at run-time
CS_OPT_SKIPDATA = 5  # Skip data when disassembling
CS_OPT_SKIPDATA_SETUP = 6      # Setup user-defined function for SKIPDATA option

# Capstone option value
CS_OPT_OFF = 0             # Turn OFF an option - default option of CS_OPT_DETAIL
CS_OPT_ON = 3              # Turn ON an option (CS_OPT_DETAIL)

# Common instruction operand types - to be consistent across all architectures.
CS_OP_INVALID = 0
CS_OP_REG = 1
CS_OP_IMM = 2
CS_OP_MEM = 3
CS_OP_FP  = 4

# Common instruction groups - to be consistent across all architectures.
CS_GRP_INVALID = 0  # uninitialized/invalid group.
CS_GRP_JUMP    = 1  # all jump instructions (conditional+direct+indirect jumps)
CS_GRP_CALL    = 2  # all call instructions
CS_GRP_RET     = 3  # all return instructions
CS_GRP_INT     = 4  # all interrupt instructions (int+syscall)
CS_GRP_IRET    = 5  # all interrupt return instructions

# Capstone syntax value
CS_OPT_SYNTAX_DEFAULT = 0    # Default assembly syntax of all platforms (CS_OPT_SYNTAX)
CS_OPT_SYNTAX_INTEL = 1    # Intel X86 asm syntax - default syntax on X86 (CS_OPT_SYNTAX, CS_ARCH_X86)
CS_OPT_SYNTAX_ATT = 2      # ATT asm syntax (CS_OPT_SYNTAX, CS_ARCH_X86)
CS_OPT_SYNTAX_NOREGNAME = 3   # Asm syntax prints register name with only number - (CS_OPT_SYNTAX, CS_ARCH_PPC, CS_ARCH_ARM)

# Capstone error type
CS_ERR_OK = 0      # No error: everything was fine
CS_ERR_MEM = 1     # Out-Of-Memory error: cs_open(), cs_disasm()
CS_ERR_ARCH = 2    # Unsupported architecture: cs_open()
CS_ERR_HANDLE = 3  # Invalid handle: cs_op_count(), cs_op_index()
CS_ERR_CSH = 4     # Invalid csh argument: cs_close(), cs_errno(), cs_option()
CS_ERR_MODE = 5    # Invalid/unsupported mode: cs_open()
CS_ERR_OPTION = 6  # Invalid/unsupported option: cs_option()
CS_ERR_DETAIL = 7  # Invalid/unsupported option: cs_option()
CS_ERR_MEMSETUP = 8
CS_ERR_VERSION = 9 # Unsupported version (bindings)
CS_ERR_DIET = 10   # Information irrelevant in diet engine
CS_ERR_SKIPDATA = 11 # Access irrelevant data for "data" instruction in SKIPDATA mode
CS_ERR_X86_ATT = 12 # X86 AT&T syntax is unsupported (opt-out at compile time)
CS_ERR_X86_INTEL = 13 # X86 Intel syntax is unsupported (opt-out at compile time)

# query id for cs_support()
CS_SUPPORT_DIET = CS_ARCH_ALL + 1
CS_SUPPORT_X86_REDUCE = CS_ARCH_ALL+2


import ctypes, ctypes.util
from os.path import split, join, dirname
import distutils.sysconfig
import pkg_resources

import inspect
if not hasattr(sys.modules[__name__], '__file__'):
    __file__ = inspect.getfile(inspect.currentframe())

if sys.platform == 'darwin':
    _lib = "libcapstone.dylib"
elif sys.platform in ('win32', 'cygwin'):
    _lib = "capstone.dll"
else:
    _lib = "libcapstone.so"

_found = False

def _load_lib(path):
    lib_file = join(path, _lib)
    #print("Trying to load %s" %lib_file)
    try:
        return ctypes.cdll.LoadLibrary(lib_file)
    except OSError:
        # if we're on linux, try again with .so.3 extension
        if lib_file.endswith('.so'):
            try:
                return ctypes.cdll.LoadLibrary(lib_file + '.3')
            except OSError:
                return None
        return None

_cs = None

# Loading attempts, in order
# - pkg_resources can get us the path to the local libraries
# - we can get the path to the local libraries by parsing our filename
# - global load
# - python's lib directory
# - last-gasp attempt at some hardcoded paths on darwin and linux

_path_list = [pkg_resources.resource_filename(__name__, 'lib'),
              join(split(__file__)[0], 'lib'),
              '',
              distutils.sysconfig.get_python_lib(),
              "/usr/local/lib/" if sys.platform == 'darwin' else '/usr/lib64']

for _path in _path_list:
    _cs = _load_lib(_path)
    if _cs is not None: break
else:
    raise ImportError("ERROR: fail to load the dynamic library.")


# low-level structure for C code

def copy_ctypes(src):
    """Returns a new ctypes object which is a bitwise copy of an existing one"""
    dst = type(src)()
    ctypes.memmove(ctypes.byref(dst), ctypes.byref(src), ctypes.sizeof(type(src)))
    return dst

def copy_ctypes_list(src):
    return [copy_ctypes(n) for n in src]

# Weird import placement because these modules are needed by the below code but need the above functions
from . import arm, arm64, mips, ppc, sparc, systemz, x86, xcore

class _cs_arch(ctypes.Union):
    _fields_ = (
        ('arm64', arm64.CsArm64),
        ('arm', arm.CsArm),
        ('mips', mips.CsMips),
        ('x86', x86.CsX86),
        ('ppc', ppc.CsPpc),
        ('sparc', sparc.CsSparc),
        ('sysz', systemz.CsSysz),
        ('xcore', xcore.CsXcore),
    )

class _cs_detail(ctypes.Structure):
    _fields_ = (
        ('regs_read', ctypes.c_ubyte * 12),
        ('regs_read_count', ctypes.c_ubyte),
        ('regs_write', ctypes.c_ubyte * 20),
        ('regs_write_count', ctypes.c_ubyte),
        ('groups', ctypes.c_ubyte * 8),
        ('groups_count', ctypes.c_ubyte),
        ('arch', _cs_arch),
    )

class _cs_insn(ctypes.Structure):
    _fields_ = (
        ('id', ctypes.c_uint),
        ('address', ctypes.c_uint64),
        ('size', ctypes.c_uint16),
        ('bytes', ctypes.c_ubyte * 16),
        ('mnemonic', ctypes.c_char * 32),
        ('op_str', ctypes.c_char * 160),
        ('detail', ctypes.POINTER(_cs_detail)),
    )

# callback for SKIPDATA option
CS_SKIPDATA_CALLBACK = ctypes.CFUNCTYPE(ctypes.c_size_t, ctypes.POINTER(ctypes.c_char), ctypes.c_size_t, ctypes.c_size_t, ctypes.c_void_p)

class _cs_opt_skipdata(ctypes.Structure):
    _fields_ = (
        ('mnemonic', ctypes.c_char_p),
        ('callback', CS_SKIPDATA_CALLBACK),
        ('user_data', ctypes.c_void_p),
    )


# setup all the function prototype
def _setup_prototype(lib, fname, restype, *argtypes):
    getattr(lib, fname).restype = restype
    getattr(lib, fname).argtypes = argtypes

_setup_prototype(_cs, "cs_open", ctypes.c_int, ctypes.c_uint, ctypes.c_uint, ctypes.POINTER(ctypes.c_size_t))
_setup_prototype(_cs, "cs_disasm", ctypes.c_size_t, ctypes.c_size_t, ctypes.POINTER(ctypes.c_char), ctypes.c_size_t, \
        ctypes.c_uint64, ctypes.c_size_t, ctypes.POINTER(ctypes.POINTER(_cs_insn)))
_setup_prototype(_cs, "cs_free", None, ctypes.c_void_p, ctypes.c_size_t)
_setup_prototype(_cs, "cs_close", ctypes.c_int, ctypes.POINTER(ctypes.c_size_t))
_setup_prototype(_cs, "cs_reg_name", ctypes.c_char_p, ctypes.c_size_t, ctypes.c_uint)
_setup_prototype(_cs, "cs_insn_name", ctypes.c_char_p, ctypes.c_size_t, ctypes.c_uint)
_setup_prototype(_cs, "cs_group_name", ctypes.c_char_p, ctypes.c_size_t, ctypes.c_uint)
_setup_prototype(_cs, "cs_op_count", ctypes.c_int, ctypes.c_size_t, ctypes.POINTER(_cs_insn), ctypes.c_uint)
_setup_prototype(_cs, "cs_op_index", ctypes.c_int, ctypes.c_size_t, ctypes.POINTER(_cs_insn), ctypes.c_uint, ctypes.c_uint)
_setup_prototype(_cs, "cs_errno", ctypes.c_int, ctypes.c_size_t)
_setup_prototype(_cs, "cs_option", ctypes.c_int, ctypes.c_size_t, ctypes.c_int, ctypes.c_void_p)
_setup_prototype(_cs, "cs_version", ctypes.c_int, ctypes.POINTER(ctypes.c_int), ctypes.POINTER(ctypes.c_int))
_setup_prototype(_cs, "cs_support", ctypes.c_bool, ctypes.c_int)
_setup_prototype(_cs, "cs_strerror", ctypes.c_char_p, ctypes.c_int)


# access to error code via @errno of CsError
class CsError(Exception):
    def __init__(self, errno):
        self.errno = errno

    if _python2:
        def __str__(self):
            return _cs.cs_strerror(self.errno)

    else:
        def __str__(self):
            return _cs.cs_strerror(self.errno).decode()


# return the core's version
def cs_version():
    major = ctypes.c_int()
    minor = ctypes.c_int()
    combined = _cs.cs_version(ctypes.byref(major), ctypes.byref(minor))
    return (major.value, minor.value, combined)


# return the binding's version
def version_bind():
    return (CS_API_MAJOR, CS_API_MINOR, (CS_API_MAJOR << 8) + CS_API_MINOR)


def cs_support(query):
    return _cs.cs_support(query)


# dummy class resembling Cs class, just for cs_disasm_quick()
# this class only need to be referenced to via 2 fields: @csh & @arch
class _dummy_cs(object):
    def __init__(self, csh, arch):
        self.csh = csh
        self.arch = arch
        self._detail = False


# Quick & dirty Python function to disasm raw binary code
# This function return CsInsn objects
# NOTE: you might want to use more efficient Cs class & its methods.
def cs_disasm_quick(arch, mode, code, offset, count=0):
    # verify version compatibility with the core before doing anything
    (major, minor, _combined) = cs_version()
    if major != CS_API_MAJOR or minor != CS_API_MINOR:
        # our binding version is different from the core's API version
        raise CsError(CS_ERR_VERSION)

    csh = ctypes.c_size_t()
    status = _cs.cs_open(arch, mode, ctypes.byref(csh))
    if status != CS_ERR_OK:
        raise CsError(status)

    all_insn = ctypes.POINTER(_cs_insn)()
    res = _cs.cs_disasm(csh, code, len(code), offset, count, ctypes.byref(all_insn))
    if res > 0:
        try:
            for i in range(res):
                yield CsInsn(_dummy_cs(csh, arch), all_insn[i])
        finally:
            _cs.cs_free(all_insn, res)
    else:
        status = _cs.cs_errno(csh)
        if status != CS_ERR_OK:
            raise CsError(status)
        return
        yield

    status = _cs.cs_close(ctypes.byref(csh))
    if status != CS_ERR_OK:
        raise CsError(status)


# Another quick, but lighter function to disasm raw binary code.
# This function is faster than cs_disasm_quick() around 20% because
# cs_disasm_lite() only return tuples of (address, size, mnemonic, op_str),
# rather than CsInsn objects.
# NOTE: you might want to use more efficient Cs class & its methods.
def cs_disasm_lite(arch, mode, code, offset, count=0):
    # verify version compatibility with the core before doing anything
    (major, minor, _combined) = cs_version()
    if major != CS_API_MAJOR or minor != CS_API_MINOR:
        # our binding version is different from the core's API version
        raise CsError(CS_ERR_VERSION)

    if cs_support(CS_SUPPORT_DIET):
        # Diet engine cannot provide @mnemonic & @op_str
        raise CsError(CS_ERR_DIET)

    csh = ctypes.c_size_t()
    status = _cs.cs_open(arch, mode, ctypes.byref(csh))
    if status != CS_ERR_OK:
        raise CsError(status)

    all_insn = ctypes.POINTER(_cs_insn)()
    res = _cs.cs_disasm(csh, code, len(code), offset, count, ctypes.byref(all_insn))
    if res > 0:
        try:
            for i in range(res):
                insn = all_insn[i]
                yield (insn.address, insn.size, insn.mnemonic.decode('ascii'), insn.op_str.decode('ascii'))
        finally:
            _cs.cs_free(all_insn, res)
    else:
        status = _cs.cs_errno(csh)
        if status != CS_ERR_OK:
            raise CsError(status)
        return
        yield

    status = _cs.cs_close(ctypes.byref(csh))
    if status != CS_ERR_OK:
        raise CsError(status)


# Python-style class to disasm code
class CsInsn(object):
    def __init__(self, cs, all_info):
        self._raw = copy_ctypes(all_info)
        self._cs = cs
        if self._cs._detail and self._raw.id != 0:
            # save detail
            self._detail = copy_ctypes(self._raw.detail.contents)

    # return instruction's ID.
    @property
    def id(self):
        return self._raw.id

    # return instruction's address.
    @property
    def address(self):
        return self._raw.address

    # return instruction's size.
    @property
    def size(self):
        return self._raw.size

    # return instruction's machine bytes (which should have @size bytes).
    @property
    def bytes(self):
        return bytearray(self._raw.bytes)[:self._raw.size]

    # return instruction's mnemonic.
    @property
    def mnemonic(self):
        if self._cs._diet:
            # Diet engine cannot provide @mnemonic.
            raise CsError(CS_ERR_DIET)

        return self._raw.mnemonic.decode('ascii')

    # return instruction's operands (in string).
    @property
    def op_str(self):
        if self._cs._diet:
            # Diet engine cannot provide @op_str.
            raise CsError(CS_ERR_DIET)

        return self._raw.op_str.decode('ascii')

    # return list of all implicit registers being read.
    @property
    def regs_read(self):
        if self._raw.id == 0:
            raise CsError(CS_ERR_SKIPDATA)

        if self._cs._diet:
            # Diet engine cannot provide @regs_read.
            raise CsError(CS_ERR_DIET)

        if self._cs._detail:
            return self._detail.regs_read[:self._detail.regs_read_count]

        raise CsError(CS_ERR_DETAIL)

    # return list of all implicit registers being modified
    @property
    def regs_write(self):
        if self._raw.id == 0:
            raise CsError(CS_ERR_SKIPDATA)

        if self._cs._diet:
            # Diet engine cannot provide @regs_write
            raise CsError(CS_ERR_DIET)

        if self._cs._detail:
            return self._detail.regs_write[:self._detail.regs_write_count]

        raise CsError(CS_ERR_DETAIL)

    # return list of semantic groups this instruction belongs to.
    @property
    def groups(self):
        if self._raw.id == 0:
            raise CsError(CS_ERR_SKIPDATA)

        if self._cs._diet:
            # Diet engine cannot provide @groups
            raise CsError(CS_ERR_DIET)

        if self._cs._detail:
            return self._detail.groups[:self._detail.groups_count]

        raise CsError(CS_ERR_DETAIL)

    def __gen_detail(self):
        arch = self._cs.arch
        if arch == CS_ARCH_ARM:
            (self.usermode, self.vector_size, self.vector_data, self.cps_mode, self.cps_flag, self.cc, self.update_flags, \
            self.writeback, self.mem_barrier, self.operands) = arm.get_arch_info(self._detail.arch.arm)
        elif arch == CS_ARCH_ARM64:
            (self.cc, self.update_flags, self.writeback, self.operands) = \
                arm64.get_arch_info(self._detail.arch.arm64)
        elif arch == CS_ARCH_X86:
            (self.prefix, self.opcode, self.rex, self.addr_size, \
                self.modrm, self.sib, self.disp, \
                self.sib_index, self.sib_scale, self.sib_base, self.sse_cc, \
                self.avx_cc, self.avx_sae, self.avx_rm, self.operands) = x86.get_arch_info(self._detail.arch.x86)
        elif arch == CS_ARCH_MIPS:
                self.operands = mips.get_arch_info(self._detail.arch.mips)
        elif arch == CS_ARCH_PPC:
            (self.bc, self.bh, self.update_cr0, self.operands) = \
                ppc.get_arch_info(self._detail.arch.ppc)
        elif arch == CS_ARCH_SPARC:
            (self.cc, self.hint, self.operands) = sparc.get_arch_info(self._detail.arch.sparc)
        elif arch == CS_ARCH_SYSZ:
            (self.cc, self.operands) = systemz.get_arch_info(self._detail.arch.sysz)
        elif arch == CS_ARCH_XCORE:
            (self.operands) = xcore.get_arch_info(self._detail.arch.xcore)


    def __getattr__(self, name):
        if not self._cs._detail:
            raise CsError(CS_ERR_DETAIL)

        attr = object.__getattribute__
        if not attr(self, '_cs')._detail:
            raise AttributeError(name)
        _dict = attr(self, '__dict__')
        if 'operands' not in _dict:
            self.__gen_detail()
        if name not in _dict:
            raise AttributeError(name)
        return _dict[name]

    # get the last error code
    def errno(self):
        return _cs.cs_errno(self._cs.csh)

    # get the register name, given the register ID
    def reg_name(self, reg_id):
        if self._raw.id == 0:
            raise CsError(CS_ERR_SKIPDATA)

        if self._cs._diet:
            # Diet engine cannot provide register name
            raise CsError(CS_ERR_DIET)

        if reg_id == 0:
            return "(invalid)"

        return _cs.cs_reg_name(self._cs.csh, reg_id).decode('ascii')

    # get the instruction name
    def insn_name(self):
        if self._cs._diet:
            # Diet engine cannot provide instruction name
            raise CsError(CS_ERR_DIET)

        if self._raw.id == 0:
            return "(invalid)"

        return _cs.cs_insn_name(self._cs.csh, self.id).decode('ascii')

    # get the group name
    def group_name(self, group_id):
        if self._raw.id == 0:
            raise CsError(CS_ERR_SKIPDATA)

        if self._cs._diet:
            # Diet engine cannot provide register name
            raise CsError(CS_ERR_DIET)

        if group_id == 0:
            return "(invalid)"

        return _cs.cs_group_name(self._cs.csh, group_id).decode('ascii')


    # verify if this insn belong to group with id as @group_id
    def group(self, group_id):
        if self._raw.id == 0:
            raise CsError(CS_ERR_SKIPDATA)

        if self._cs._diet:
            # Diet engine cannot provide group information
            raise CsError(CS_ERR_DIET)

        return group_id in self.groups

    # verify if this instruction implicitly read register @reg_id
    def reg_read(self, reg_id):
        if self._raw.id == 0:
            raise CsError(CS_ERR_SKIPDATA)

        if self._cs._diet:
            # Diet engine cannot provide regs_read information
            raise CsError(CS_ERR_DIET)

        return reg_id in self.regs_read

    # verify if this instruction implicitly modified register @reg_id
    def reg_write(self, reg_id):
        if self._raw.id == 0:
            raise CsError(CS_ERR_SKIPDATA)

        if self._cs._diet:
            # Diet engine cannot provide regs_write information
            raise CsError(CS_ERR_DIET)

        return reg_id in self.regs_write

    # return number of operands having same operand type @op_type
    def op_count(self, op_type):
        if self._raw.id == 0:
            raise CsError(CS_ERR_SKIPDATA)

        c = 0
        for op in self.operands:
            if op.type == op_type:
                c += 1
        return c

    # get the operand at position @position of all operands having the same type @op_type
    def op_find(self, op_type, position):
        if self._raw.id == 0:
            raise CsError(CS_ERR_SKIPDATA)

        c = 0
        for op in self.operands:
            if op.type == op_type:
                c += 1
            if c == position:
                return op


class Cs(object):
    def __init__(self, arch, mode):
        # verify version compatibility with the core before doing anything
        (major, minor, _combined) = cs_version()
        if major != CS_API_MAJOR or minor != CS_API_MINOR:
            self.csh = None
            # our binding version is different from the core's API version
            raise CsError(CS_ERR_VERSION)

        self.arch, self._mode = arch, mode
        self.csh = ctypes.c_size_t()
        status = _cs.cs_open(arch, mode, ctypes.byref(self.csh))
        if status != CS_ERR_OK:
            self.csh = None
            raise CsError(status)

        try:
            import ccapstone
            # rewire disasm to use the faster version
            self.disasm = ccapstone.Cs(self).disasm
        except:
            pass

        if arch == CS_ARCH_X86:
            # Intel syntax is default for X86
            self._syntax = CS_OPT_SYNTAX_INTEL
        else:
            self._syntax = None

        self._detail = False  # by default, do not produce instruction details
        self._diet = cs_support(CS_SUPPORT_DIET)
        self._x86reduce = cs_support(CS_SUPPORT_X86_REDUCE)

        # default mnemonic for SKIPDATA
        self._skipdata_mnem = ".byte"
        self._skipdata = False


    # destructor to be called automatically when object is destroyed.
    def __del__(self):
        if self.csh:
            try:
                status = _cs.cs_close(ctypes.byref(self.csh))
                if status != CS_ERR_OK:
                    raise CsError(status)
            except: # _cs might be pulled from under our feet
                pass


    # def option(self, opt_type, opt_value):
    #    return _cs.cs_option(self.csh, opt_type, opt_value)


    # is this a diet engine?
    @property
    def diet(self):
        return self._diet


    # is this engine compiled with X86-reduce option?
    @property
    def x86_reduce(self):
        return self._x86reduce


    # return assembly syntax.
    @property
    def syntax(self):
        return self._syntax


    # syntax setter: modify assembly syntax.
    @syntax.setter
    def syntax(self, style):
        status = _cs.cs_option(self.csh, CS_OPT_SYNTAX, style)
        if status != CS_ERR_OK:
            raise CsError(status)
        # save syntax
        self._syntax = style


    # return current skipdata status
    @property
    def skipdata(self):
        return self._skipdata


    # setter: modify skipdata status
    @skipdata.setter
    def skipdata(self, opt):
        if opt == False:
            status = _cs.cs_option(self.csh, CS_OPT_SKIPDATA, CS_OPT_OFF)
        else:
            status = _cs.cs_option(self.csh, CS_OPT_SKIPDATA, CS_OPT_ON)
        if status != CS_ERR_OK:
            raise CsError(status)

        # save this option
        self._skipdata = opt


    def skipdata_setup(self, opt):
        _skipdata_opt = _cs_opt_skipdata()
        _mnem, _cb, _ud = opt
        _skipdata_opt.mnemonic = _mnem.encode()
        _skipdata_opt.callback = CS_SKIPDATA_CALLBACK(_cb)
        _skipdata_opt.user_data = ctypes.cast(_ud, ctypes.c_void_p)
        status = _cs.cs_option(self.csh, CS_OPT_SKIPDATA_SETUP, ctypes.cast(ctypes.byref(_skipdata_opt), ctypes.c_void_p))
        if status != CS_ERR_OK:
            raise CsError(status)

        self._skipdata_opt = _skipdata_opt


    # check to see if this engine supports a particular arch,
    # or diet mode (depending on @query).
    def support(self, query):
        return cs_support(query)


    # is detail mode enable?
    @property
    def detail(self):
        return self._detail


    # modify detail mode.
    @detail.setter
    def detail(self, opt):  # opt is boolean type, so must be either 'True' or 'False'
        if opt == False:
            status = _cs.cs_option(self.csh, CS_OPT_DETAIL, CS_OPT_OFF)
        else:
            status = _cs.cs_option(self.csh, CS_OPT_DETAIL, CS_OPT_ON)
        if status != CS_ERR_OK:
            raise CsError(status)
        # save detail
        self._detail = opt


    # return disassembly mode of this engine.
    @property
    def mode(self):
        return self._mode


    # modify engine's mode at run-time.
    @mode.setter
    def mode(self, opt):  # opt is new disasm mode, of int type
        status = _cs.cs_option(self.csh, CS_OPT_MODE, opt)
        if status != CS_ERR_OK:
            raise CsError(status)
        # save mode
        self._mode = opt


    # Disassemble binary & return disassembled instructions in CsInsn objects
    def disasm(self, code, offset, count=0):
        all_insn = ctypes.POINTER(_cs_insn)()
        '''if not _python2:
            print(code)
            code = code.encode()
            print(code)'''
        # Hack, unicorn's memory accessors give you back bytearrays, but they
        # cause TypeErrors when you hand them into Capstone.
        if isinstance(code, bytearray):
            code = bytes(code)
        res = _cs.cs_disasm(self.csh, code, len(code), offset, count, ctypes.byref(all_insn))
        if res > 0:
            try:
                for i in range(res):
                    yield CsInsn(self, all_insn[i])
            finally:
                _cs.cs_free(all_insn, res)
        else:
            status = _cs.cs_errno(self.csh)
            if status != CS_ERR_OK:
                raise CsError(status)
            return
            yield


    # Light function to disassemble binary. This is about 20% faster than disasm() because
    # unlike disasm(), disasm_lite() only return tuples of (address, size, mnemonic, op_str),
    # rather than CsInsn objects.
    def disasm_lite(self, code, offset, count=0):
        if self._diet:
            # Diet engine cannot provide @mnemonic & @op_str
            raise CsError(CS_ERR_DIET)

        all_insn = ctypes.POINTER(_cs_insn)()
        res = _cs.cs_disasm(self.csh, code, len(code), offset, count, ctypes.byref(all_insn))
        if res > 0:
            try:
                for i in range(res):
                    insn = all_insn[i]
                    yield (insn.address, insn.size, insn.mnemonic.decode('ascii'), insn.op_str.decode('ascii'))
            finally:
                _cs.cs_free(all_insn, res)
        else:
            status = _cs.cs_errno(self.csh)
            if status != CS_ERR_OK:
                raise CsError(status)
            return
            yield


# print out debugging info
def debug():
    # is Cython there?
    try:
        from . import ccapstone
        return ccapstone.debug()
    except:
        # no Cython, fallback to Python code below
        pass

    if cs_support(CS_SUPPORT_DIET):
        diet = "diet"
    else:
        diet = "standard"

    archs = { "arm": CS_ARCH_ARM, "arm64": CS_ARCH_ARM64, \
        "mips": CS_ARCH_MIPS, "ppc": CS_ARCH_PPC, "sparc": CS_ARCH_SPARC, \
        "sysz": CS_ARCH_SYSZ, 'xcore': CS_ARCH_XCORE }

    all_archs = ""
    keys = archs.keys()
    for k in sorted(keys):
        if cs_support(archs[k]):
            all_archs += "-%s" % k

    if cs_support(CS_ARCH_X86):
        all_archs += "-x86"
        if cs_support(CS_SUPPORT_X86_REDUCE):
            all_archs += "_reduce"

    (major, minor, _combined) = cs_version()

    return "python-%s%s-c%u.%u-b%u.%u" % (diet, all_archs, major, minor, CS_API_MAJOR, CS_API_MINOR)