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289 lines
8.2 KiB
Python
289 lines
8.2 KiB
Python
# coding: utf-8
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'''
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Python bindings for libmagic
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'''
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import ctypes
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from collections import namedtuple
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from ctypes import *
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from ctypes.util import find_library
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def _init():
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"""
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Loads the shared library through ctypes and returns a library
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L{ctypes.CDLL} instance
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"""
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return ctypes.cdll.LoadLibrary(find_library('magic'))
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_libraries = {}
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_libraries['magic'] = _init()
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# Flag constants for open and setflags
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MAGIC_NONE = NONE = 0
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MAGIC_DEBUG = DEBUG = 1
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MAGIC_SYMLINK = SYMLINK = 2
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MAGIC_COMPRESS = COMPRESS = 4
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MAGIC_DEVICES = DEVICES = 8
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MAGIC_MIME_TYPE = MIME_TYPE = 16
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MAGIC_CONTINUE = CONTINUE = 32
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MAGIC_CHECK = CHECK = 64
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MAGIC_PRESERVE_ATIME = PRESERVE_ATIME = 128
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MAGIC_RAW = RAW = 256
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MAGIC_ERROR = ERROR = 512
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MAGIC_MIME_ENCODING = MIME_ENCODING = 1024
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MAGIC_MIME = MIME = 1040 # MIME_TYPE + MIME_ENCODING
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MAGIC_APPLE = APPLE = 2048
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MAGIC_NO_CHECK_COMPRESS = NO_CHECK_COMPRESS = 4096
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MAGIC_NO_CHECK_TAR = NO_CHECK_TAR = 8192
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MAGIC_NO_CHECK_SOFT = NO_CHECK_SOFT = 16384
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MAGIC_NO_CHECK_APPTYPE = NO_CHECK_APPTYPE = 32768
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MAGIC_NO_CHECK_ELF = NO_CHECK_ELF = 65536
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MAGIC_NO_CHECK_TEXT = NO_CHECK_TEXT = 131072
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MAGIC_NO_CHECK_CDF = NO_CHECK_CDF = 262144
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MAGIC_NO_CHECK_TOKENS = NO_CHECK_TOKENS = 1048576
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MAGIC_NO_CHECK_ENCODING = NO_CHECK_ENCODING = 2097152
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MAGIC_NO_CHECK_BUILTIN = NO_CHECK_BUILTIN = 4173824
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FileMagic = namedtuple('FileMagic', ('mime_type', 'encoding', 'name'))
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class magic_set(Structure):
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pass
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magic_set._fields_ = []
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magic_t = POINTER(magic_set)
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_open = _libraries['magic'].magic_open
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_open.restype = magic_t
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_open.argtypes = [c_int]
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_close = _libraries['magic'].magic_close
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_close.restype = None
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_close.argtypes = [magic_t]
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_file = _libraries['magic'].magic_file
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_file.restype = c_char_p
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_file.argtypes = [magic_t, c_char_p]
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_descriptor = _libraries['magic'].magic_descriptor
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_descriptor.restype = c_char_p
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_descriptor.argtypes = [magic_t, c_int]
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_buffer = _libraries['magic'].magic_buffer
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_buffer.restype = c_char_p
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_buffer.argtypes = [magic_t, c_void_p, c_size_t]
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_error = _libraries['magic'].magic_error
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_error.restype = c_char_p
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_error.argtypes = [magic_t]
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_setflags = _libraries['magic'].magic_setflags
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_setflags.restype = c_int
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_setflags.argtypes = [magic_t, c_int]
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_load = _libraries['magic'].magic_load
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_load.restype = c_int
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_load.argtypes = [magic_t, c_char_p]
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_compile = _libraries['magic'].magic_compile
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_compile.restype = c_int
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_compile.argtypes = [magic_t, c_char_p]
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_check = _libraries['magic'].magic_check
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_check.restype = c_int
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_check.argtypes = [magic_t, c_char_p]
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_list = _libraries['magic'].magic_list
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_list.restype = c_int
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_list.argtypes = [magic_t, c_char_p]
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_errno = _libraries['magic'].magic_errno
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_errno.restype = c_int
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_errno.argtypes = [magic_t]
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class Magic(object):
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def __init__(self, ms):
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self._magic_t = ms
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def close(self):
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"""
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Closes the magic database and deallocates any resources used.
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"""
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_close(self._magic_t)
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@staticmethod
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def __tostr(s):
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if s is None:
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return None
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if isinstance(s, str):
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return s
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try: # keep Python 2 compatibility
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return str(s, 'utf-8')
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except TypeError:
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return str(s)
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@staticmethod
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def __tobytes(b):
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if b is None:
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return None
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if isinstance(b, bytes):
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return b
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try: # keep Python 2 compatibility
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return bytes(b, 'utf-8')
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except TypeError:
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return bytes(b)
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def file(self, filename):
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"""
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Returns a textual description of the contents of the argument passed
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as a filename or None if an error occurred and the MAGIC_ERROR flag
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is set. A call to errno() will return the numeric error code.
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"""
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return Magic.__tostr(_file(self._magic_t, Magic.__tobytes(filename)))
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def descriptor(self, fd):
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"""
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Returns a textual description of the contents of the argument passed
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as a file descriptor or None if an error occurred and the MAGIC_ERROR
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flag is set. A call to errno() will return the numeric error code.
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"""
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return Magic.__tostr(_descriptor(self._magic_t, fd))
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def buffer(self, buf):
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"""
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Returns a textual description of the contents of the argument passed
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as a buffer or None if an error occurred and the MAGIC_ERROR flag
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is set. A call to errno() will return the numeric error code.
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"""
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return Magic.__tostr(_buffer(self._magic_t, buf, len(buf)))
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def error(self):
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"""
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Returns a textual explanation of the last error or None
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if there was no error.
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"""
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return Magic.__tostr(_error(self._magic_t))
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def setflags(self, flags):
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"""
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Set flags on the magic object which determine how magic checking
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behaves; a bitwise OR of the flags described in libmagic(3), but
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without the MAGIC_ prefix.
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Returns -1 on systems that don't support utime(2) or utimes(2)
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when PRESERVE_ATIME is set.
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"""
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return _setflags(self._magic_t, flags)
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def load(self, filename=None):
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"""
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Must be called to load entries in the colon separated list of database
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files passed as argument or the default database file if no argument
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before any magic queries can be performed.
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Returns 0 on success and -1 on failure.
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"""
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return _load(self._magic_t, Magic.__tobytes(filename))
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def compile(self, dbs):
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"""
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Compile entries in the colon separated list of database files
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passed as argument or the default database file if no argument.
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The compiled files created are named from the basename(1) of each file
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argument with ".mgc" appended to it.
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Returns 0 on success and -1 on failure.
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"""
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return _compile(self._magic_t, Magic.__tobytes(dbs))
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def check(self, dbs):
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"""
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Check the validity of entries in the colon separated list of
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database files passed as argument or the default database file
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if no argument.
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Returns 0 on success and -1 on failure.
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"""
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return _check(self._magic_t, Magic.__tobytes(dbs))
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def list(self, dbs):
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"""
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Check the validity of entries in the colon separated list of
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database files passed as argument or the default database file
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if no argument.
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Returns 0 on success and -1 on failure.
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"""
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return _list(self._magic_t, Magic.__tobytes(dbs))
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def errno(self):
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"""
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Returns a numeric error code. If return value is 0, an internal
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magic error occurred. If return value is non-zero, the value is
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an OS error code. Use the errno module or os.strerror() can be used
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to provide detailed error information.
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"""
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return _errno(self._magic_t)
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def open(flags):
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"""
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Returns a magic object on success and None on failure.
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Flags argument as for setflags.
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"""
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return Magic(_open(flags))
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# Objects used by `detect_from_` functions
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mime_magic = Magic(_open(MAGIC_MIME))
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mime_magic.load()
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none_magic = Magic(_open(MAGIC_NONE))
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none_magic.load()
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def _create_filemagic(mime_detected, type_detected):
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try:
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mime_type, mime_encoding = mime_detected.split('; ')
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except ValueError:
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raise ValueError(mime_detected)
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return FileMagic(name=type_detected, mime_type=mime_type,
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encoding=mime_encoding.replace('charset=', ''))
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def detect_from_filename(filename):
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'''Detect mime type, encoding and file type from a filename
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Returns a `FileMagic` namedtuple.
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'''
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return _create_filemagic(mime_magic.file(filename),
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none_magic.file(filename))
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def detect_from_fobj(fobj):
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'''Detect mime type, encoding and file type from file-like object
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Returns a `FileMagic` namedtuple.
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'''
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file_descriptor = fobj.fileno()
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return _create_filemagic(mime_magic.descriptor(file_descriptor),
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none_magic.descriptor(file_descriptor))
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def detect_from_content(byte_content):
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'''Detect mime type, encoding and file type from bytes
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Returns a `FileMagic` namedtuple.
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'''
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return _create_filemagic(mime_magic.buffer(byte_content),
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none_magic.buffer(byte_content))
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