python-magic/debian/patches/libmagic-compat.patch

Subject: libmagic compability
Origin: libmagic-compat branch, commit 9aba180
Upstream-Author: Adam Hupp <adam@hupp.org>
Date: Mon Dec 4 11:55:27 2017 -0800

--- a/LICENSE
+++ b/LICENSE
@@ -19,3 +19,40 @@
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
+
+
+====
+
+Portions of this package (magic/compat.py and test/libmagic_test.py)
+are distributed under the following copyright notice:
+
+
+$File: LEGAL.NOTICE,v 1.15 2006/05/03 18:48:33 christos Exp $
+Copyright (c) Ian F. Darwin 1986, 1987, 1989, 1990, 1991, 1992, 1994, 1995.
+Software written by Ian F. Darwin and others;
+maintained 1994- Christos Zoulas.
+
+This software is not subject to any export provision of the United States
+Department of Commerce, and may be exported to any country or planet.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice immediately at the beginning of the file, without modification,
+   this list of conditions, and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGE.
--- a/README.md
+++ b/README.md
@@ -45,9 +45,18 @@
 
 Minor version bumps should be backwards compatible.  Major bumps are not.
 
-## Name Conflict
+## Compatability
 
-There are, sadly, two libraries which use the module name `magic`.  Both have been around for quite a while.If you are using this module and get an error using a method like `open`, your code is expecting the other one.  Hopefully one day these will be reconciled.
+There are, sadly, 3 libraries using the package name `magic`.  The others are:
+
+1. libmagic itself distributes a `magic` python module with a somewhat
+different API.  python-magic includes a copy of this module to avoid
+unnessary breakage when both versions are installed.  Maybe someday
+they will converge.
+
+2. python-libmagic also uses the same module name, and has a similar
+but not identical API.  If you run into errors about "magic.h" not
+being present, you should uninstall python-libmagic.
 
 ## Installation
 
@@ -116,5 +125,3 @@
 
 python-magic is distributed under the MIT license.  See the included
 LICENSE file for details.
-
-
--- a/magic.py
+++ /dev/null
@@ -1,301 +0,0 @@
-"""
-magic is a wrapper around the libmagic file identification library.
-
-See README for more information.
-
-Usage:
-
->>> import magic
->>> magic.from_file("testdata/test.pdf")
-'PDF document, version 1.2'
->>> magic.from_file("testdata/test.pdf", mime=True)
-'application/pdf'
->>> magic.from_buffer(open("testdata/test.pdf").read(1024))
-'PDF document, version 1.2'
->>>
-
-
-"""
-
-import sys
-import glob
-import os.path
-import ctypes
-import ctypes.util
-import threading
-
-from ctypes import c_char_p, c_int, c_size_t, c_void_p
-
-
-class MagicException(Exception):
-    def __init__(self, message):
-        super(MagicException, self).__init__(message)
-        self.message = message
-
-
-class Magic:
-    """
-    Magic is a wrapper around the libmagic C library.
-
-    """
-
-    def __init__(self, mime=False, magic_file=None, mime_encoding=False,
-                 keep_going=False, uncompress=False):
-        """
-        Create a new libmagic wrapper.
-
-        mime - if True, mimetypes are returned instead of textual descriptions
-        mime_encoding - if True, codec is returned
-        magic_file - use a mime database other than the system default
-        keep_going - don't stop at the first match, keep going
-        uncompress - Try to look inside compressed files.
-        """
-        self.flags = MAGIC_NONE
-        if mime:
-            self.flags |= MAGIC_MIME
-        if mime_encoding:
-            self.flags |= MAGIC_MIME_ENCODING
-        if keep_going:
-            self.flags |= MAGIC_CONTINUE
-
-        if uncompress:
-            self.flags |= MAGIC_COMPRESS
-
-        self.cookie = magic_open(self.flags)
-        self.lock = threading.Lock()
-        
-        magic_load(self.cookie, magic_file)
-
-    def from_buffer(self, buf):
-        """
-        Identify the contents of `buf`
-        """
-        with self.lock:
-            try:
-                # if we're on python3, convert buf to bytes
-                # otherwise this string is passed as wchar*
-                # which is not what libmagic expects
-                if type(buf) == str and str != bytes:
-                   buf = buf.encode('utf-8', errors='replace')
-                return maybe_decode(magic_buffer(self.cookie, buf))
-            except MagicException as e:
-                return self._handle509Bug(e)
-
-    def from_file(self, filename):
-        # raise FileNotFoundException or IOError if the file does not exist
-        with open(filename):
-            pass
-        with self.lock:
-            try:
-                return maybe_decode(magic_file(self.cookie, filename))
-            except MagicException as e:
-                return self._handle509Bug(e)
-
-    def _handle509Bug(self, e):
-        # libmagic 5.09 has a bug where it might fail to identify the
-        # mimetype of a file and returns null from magic_file (and
-        # likely _buffer), but also does not return an error message.
-        if e.message is None and (self.flags & MAGIC_MIME):
-            return "application/octet-stream"
-        else:
-            raise e
-        
-    def __del__(self):
-        # no _thread_check here because there can be no other
-        # references to this object at this point.
-
-        # during shutdown magic_close may have been cleared already so
-        # make sure it exists before using it.
-
-        # the self.cookie check should be unnecessary and was an
-        # incorrect fix for a threading problem, however I'm leaving
-        # it in because it's harmless and I'm slightly afraid to
-        # remove it.
-        if self.cookie and magic_close:
-            magic_close(self.cookie)
-            self.cookie = None
-
-_instances = {}
-
-def _get_magic_type(mime):
-    i = _instances.get(mime)
-    if i is None:
-        i = _instances[mime] = Magic(mime=mime)
-    return i
-
-def from_file(filename, mime=False):
-    """"
-    Accepts a filename and returns the detected filetype.  Return
-    value is the mimetype if mime=True, otherwise a human readable
-    name.
-
-    >>> magic.from_file("testdata/test.pdf", mime=True)
-    'application/pdf'
-    """
-    m = _get_magic_type(mime)
-    return m.from_file(filename)
-
-def from_buffer(buffer, mime=False):
-    """
-    Accepts a binary string and returns the detected filetype.  Return
-    value is the mimetype if mime=True, otherwise a human readable
-    name.
-
-    >>> magic.from_buffer(open("testdata/test.pdf").read(1024))
-    'PDF document, version 1.2'
-    """
-    m = _get_magic_type(mime)
-    return m.from_buffer(buffer)
-
-
-
-
-libmagic = None
-# Let's try to find magic or magic1
-dll = ctypes.util.find_library('magic') or ctypes.util.find_library('magic1') or ctypes.util.find_library('cygmagic-1')
-
-# This is necessary because find_library returns None if it doesn't find the library
-if dll:
-    libmagic = ctypes.CDLL(dll)
-
-if not libmagic or not libmagic._name:
-    windows_dlls = ['magic1.dll','cygmagic-1.dll']
-    platform_to_lib = {'darwin': ['/opt/local/lib/libmagic.dylib',
-                                  '/usr/local/lib/libmagic.dylib'] +
-                         # Assumes there will only be one version installed
-                         glob.glob('/usr/local/Cellar/libmagic/*/lib/libmagic.dylib'),
-                       'win32': windows_dlls,
-                       'cygwin': windows_dlls,
-                       'linux': ['libmagic.so.1'],    # fallback for some Linuxes (e.g. Alpine) where library search does not work
-                      }
-    platform = 'linux' if sys.platform.startswith('linux') else sys.platform
-    for dll in platform_to_lib.get(platform, []):
-        try:
-            libmagic = ctypes.CDLL(dll)
-            break
-        except OSError:
-            pass
-
-if not libmagic or not libmagic._name:
-    # It is better to raise an ImportError since we are importing magic module
-    raise ImportError('failed to find libmagic.  Check your installation')
-
-magic_t = ctypes.c_void_p
-
-def errorcheck_null(result, func, args):
-    if result is None:
-        err = magic_error(args[0])
-        raise MagicException(err)
-    else:
-        return result
-
-def errorcheck_negative_one(result, func, args):
-    if result is -1:
-        err = magic_error(args[0])
-        raise MagicException(err)
-    else:
-        return result
-
-
-# return str on python3.  Don't want to unconditionally
-# decode because that results in unicode on python2
-def maybe_decode(s):
-    if str == bytes:
-        return s
-    else:
-        return s.decode('utf-8')
-    
-def coerce_filename(filename):
-    if filename is None:
-        return None
-
-    # ctypes will implicitly convert unicode strings to bytes with
-    # .encode('ascii').  If you use the filesystem encoding 
-    # then you'll get inconsistent behavior (crashes) depending on the user's
-    # LANG environment variable
-    is_unicode = (sys.version_info[0] <= 2 and
-                  isinstance(filename, unicode)) or \
-                  (sys.version_info[0] >= 3 and
-                   isinstance(filename, str))
-    if is_unicode:
-        return filename.encode('utf-8', 'surrogateescape')
-    else:
-        return filename
-
-magic_open = libmagic.magic_open
-magic_open.restype = magic_t
-magic_open.argtypes = [c_int]
-
-magic_close = libmagic.magic_close
-magic_close.restype = None
-magic_close.argtypes = [magic_t]
-
-magic_error = libmagic.magic_error
-magic_error.restype = c_char_p
-magic_error.argtypes = [magic_t]
-
-magic_errno = libmagic.magic_errno
-magic_errno.restype = c_int
-magic_errno.argtypes = [magic_t]
-
-_magic_file = libmagic.magic_file
-_magic_file.restype = c_char_p
-_magic_file.argtypes = [magic_t, c_char_p]
-_magic_file.errcheck = errorcheck_null
-
-def magic_file(cookie, filename):
-    return _magic_file(cookie, coerce_filename(filename))
-
-_magic_buffer = libmagic.magic_buffer
-_magic_buffer.restype = c_char_p
-_magic_buffer.argtypes = [magic_t, c_void_p, c_size_t]
-_magic_buffer.errcheck = errorcheck_null
-
-def magic_buffer(cookie, buf):
-    return _magic_buffer(cookie, buf, len(buf))
-
-
-_magic_load = libmagic.magic_load
-_magic_load.restype = c_int
-_magic_load.argtypes = [magic_t, c_char_p]
-_magic_load.errcheck = errorcheck_negative_one
-
-def magic_load(cookie, filename):
-    return _magic_load(cookie, coerce_filename(filename))
-
-magic_setflags = libmagic.magic_setflags
-magic_setflags.restype = c_int
-magic_setflags.argtypes = [magic_t, c_int]
-
-magic_check = libmagic.magic_check
-magic_check.restype = c_int
-magic_check.argtypes = [magic_t, c_char_p]
-
-magic_compile = libmagic.magic_compile
-magic_compile.restype = c_int
-magic_compile.argtypes = [magic_t, c_char_p]
-
-
-
-MAGIC_NONE = 0x000000 # No flags
-MAGIC_DEBUG = 0x000001 # Turn on debugging
-MAGIC_SYMLINK = 0x000002 # Follow symlinks
-MAGIC_COMPRESS = 0x000004 # Check inside compressed files
-MAGIC_DEVICES = 0x000008 # Look at the contents of devices
-MAGIC_MIME = 0x000010 # Return a mime string
-MAGIC_MIME_ENCODING = 0x000400 # Return the MIME encoding
-MAGIC_CONTINUE = 0x000020 # Return all matches
-MAGIC_CHECK = 0x000040 # Print warnings to stderr
-MAGIC_PRESERVE_ATIME = 0x000080 # Restore access time on exit
-MAGIC_RAW = 0x000100 # Don't translate unprintable chars
-MAGIC_ERROR = 0x000200 # Handle ENOENT etc as real errors
-
-MAGIC_NO_CHECK_COMPRESS = 0x001000 # Don't check for compressed files
-MAGIC_NO_CHECK_TAR = 0x002000 # Don't check for tar files
-MAGIC_NO_CHECK_SOFT = 0x004000 # Don't check magic entries
-MAGIC_NO_CHECK_APPTYPE = 0x008000 # Don't check application type
-MAGIC_NO_CHECK_ELF = 0x010000 # Don't check for elf details
-MAGIC_NO_CHECK_ASCII = 0x020000 # Don't check for ascii files
-MAGIC_NO_CHECK_TROFF = 0x040000 # Don't check ascii/troff
-MAGIC_NO_CHECK_FORTRAN = 0x080000 # Don't check ascii/fortran
-MAGIC_NO_CHECK_TOKENS = 0x100000 # Don't check ascii/tokens
--- /dev/null
+++ b/magic/__init__.py
@@ -0,0 +1,357 @@
+"""
+magic is a wrapper around the libmagic file identification library.
+
+See README for more information.
+
+Usage:
+
+>>> import magic
+>>> magic.from_file("testdata/test.pdf")
+'PDF document, version 1.2'
+>>> magic.from_file("testdata/test.pdf", mime=True)
+'application/pdf'
+>>> magic.from_buffer(open("testdata/test.pdf").read(1024))
+'PDF document, version 1.2'
+>>>
+
+
+"""
+
+import sys
+import glob
+import os.path
+import ctypes
+import ctypes.util
+import threading
+import logging
+
+from ctypes import c_char_p, c_int, c_size_t, c_void_p
+
+
+class MagicException(Exception):
+    def __init__(self, message):
+        super(MagicException, self).__init__(message)
+        self.message = message
+
+
+class Magic:
+    """
+    Magic is a wrapper around the libmagic C library.
+
+    """
+
+    def __init__(self, mime=False, magic_file=None, mime_encoding=False,
+                 keep_going=False, uncompress=False):
+        """
+        Create a new libmagic wrapper.
+
+        mime - if True, mimetypes are returned instead of textual descriptions
+        mime_encoding - if True, codec is returned
+        magic_file - use a mime database other than the system default
+        keep_going - don't stop at the first match, keep going
+        uncompress - Try to look inside compressed files.
+        """
+        self.flags = MAGIC_NONE
+        if mime:
+            self.flags |= MAGIC_MIME
+        if mime_encoding:
+            self.flags |= MAGIC_MIME_ENCODING
+        if keep_going:
+            self.flags |= MAGIC_CONTINUE
+
+        if uncompress:
+            self.flags |= MAGIC_COMPRESS
+
+        self.cookie = magic_open(self.flags)
+        self.lock = threading.Lock()
+
+        magic_load(self.cookie, magic_file)
+
+    def from_buffer(self, buf):
+        """
+        Identify the contents of `buf`
+        """
+        with self.lock:
+            try:
+                # if we're on python3, convert buf to bytes
+                # otherwise this string is passed as wchar*
+                # which is not what libmagic expects
+                if type(buf) == str and str != bytes:
+                   buf = buf.encode('utf-8', errors='replace')
+                return maybe_decode(magic_buffer(self.cookie, buf))
+            except MagicException as e:
+                return self._handle509Bug(e)
+
+    def from_open_file(self, open_file):
+        with self.lock:
+            try:
+                return maybe_decode(magic_descriptor(self.cookie, open_file.fileno()))
+            except MagicException as e:
+                return self._handle509Bug(e)
+
+    def from_file(self, filename):
+        # raise FileNotFoundException or IOError if the file does not exist
+        # use __builtins__ because the compat stuff at the bottom shadows the builtin open
+        with __builtins__['open'](filename):
+            pass
+
+        with self.lock:
+            try:
+                return maybe_decode(magic_file(self.cookie, filename))
+            except MagicException as e:
+                return self._handle509Bug(e)
+
+    def _handle509Bug(self, e):
+        # libmagic 5.09 has a bug where it might fail to identify the
+        # mimetype of a file and returns null from magic_file (and
+        # likely _buffer), but also does not return an error message.
+        if e.message is None and (self.flags & MAGIC_MIME):
+            return "application/octet-stream"
+        else:
+            raise e
+
+    def __del__(self):
+        # no _thread_check here because there can be no other
+        # references to this object at this point.
+
+        # during shutdown magic_close may have been cleared already so
+        # make sure it exists before using it.
+
+        # the self.cookie check should be unnecessary and was an
+        # incorrect fix for a threading problem, however I'm leaving
+        # it in because it's harmless and I'm slightly afraid to
+        # remove it.
+        if self.cookie and magic_close:
+            magic_close(self.cookie)
+            self.cookie = None
+
+_instances = {}
+
+def _get_magic_type(mime):
+    i = _instances.get(mime)
+    if i is None:
+        i = _instances[mime] = Magic(mime=mime)
+    return i
+
+def from_file(filename, mime=False):
+    """"
+    Accepts a filename and returns the detected filetype.  Return
+    value is the mimetype if mime=True, otherwise a human readable
+    name.
+
+    >>> magic.from_file("testdata/test.pdf", mime=True)
+    'application/pdf'
+    """
+    m = _get_magic_type(mime)
+    return m.from_file(filename)
+
+def from_buffer(buffer, mime=False):
+    """
+    Accepts a binary string and returns the detected filetype.  Return
+    value is the mimetype if mime=True, otherwise a human readable
+    name.
+
+    >>> magic.from_buffer(open("testdata/test.pdf").read(1024))
+    'PDF document, version 1.2'
+    """
+    m = _get_magic_type(mime)
+    return m.from_buffer(buffer)
+
+
+
+
+libmagic = None
+# Let's try to find magic or magic1
+dll = ctypes.util.find_library('magic') or ctypes.util.find_library('magic1') or ctypes.util.find_library('cygmagic-1')
+
+# This is necessary because find_library returns None if it doesn't find the library
+if dll:
+    libmagic = ctypes.CDLL(dll)
+
+if not libmagic or not libmagic._name:
+    windows_dlls = ['magic1.dll','cygmagic-1.dll']
+    platform_to_lib = {'darwin': ['/opt/local/lib/libmagic.dylib',
+                                  '/usr/local/lib/libmagic.dylib'] +
+                         # Assumes there will only be one version installed
+                         glob.glob('/usr/local/Cellar/libmagic/*/lib/libmagic.dylib'),
+                       'win32': windows_dlls,
+                       'cygwin': windows_dlls,
+                       'linux': ['libmagic.so.1'],    # fallback for some Linuxes (e.g. Alpine) where library search does not work
+                      }
+    platform = 'linux' if sys.platform.startswith('linux') else sys.platform
+    for dll in platform_to_lib.get(platform, []):
+        try:
+            libmagic = ctypes.CDLL(dll)
+            break
+        except OSError:
+            pass
+
+if not libmagic or not libmagic._name:
+    # It is better to raise an ImportError since we are importing magic module
+    raise ImportError('failed to find libmagic.  Check your installation')
+
+magic_t = ctypes.c_void_p
+
+def errorcheck_null(result, func, args):
+    if result is None:
+        err = magic_error(args[0])
+        raise MagicException(err)
+    else:
+        return result
+
+def errorcheck_negative_one(result, func, args):
+    if result is -1:
+        err = magic_error(args[0])
+        raise MagicException(err)
+    else:
+        return result
+
+
+# return str on python3.  Don't want to unconditionally
+# decode because that results in unicode on python2
+def maybe_decode(s):
+    if str == bytes:
+        return s
+    else:
+        return s.decode('utf-8')
+
+def coerce_filename(filename):
+    if filename is None:
+        return None
+
+    # ctypes will implicitly convert unicode strings to bytes with
+    # .encode('ascii').  If you use the filesystem encoding
+    # then you'll get inconsistent behavior (crashes) depending on the user's
+    # LANG environment variable
+    is_unicode = (sys.version_info[0] <= 2 and
+                  isinstance(filename, unicode)) or \
+                  (sys.version_info[0] >= 3 and
+                   isinstance(filename, str))
+    if is_unicode:
+        return filename.encode('utf-8', 'surrogateescape')
+    else:
+        return filename
+
+magic_open = libmagic.magic_open
+magic_open.restype = magic_t
+magic_open.argtypes = [c_int]
+
+magic_close = libmagic.magic_close
+magic_close.restype = None
+magic_close.argtypes = [magic_t]
+
+magic_error = libmagic.magic_error
+magic_error.restype = c_char_p
+magic_error.argtypes = [magic_t]
+
+magic_errno = libmagic.magic_errno
+magic_errno.restype = c_int
+magic_errno.argtypes = [magic_t]
+
+_magic_file = libmagic.magic_file
+_magic_file.restype = c_char_p
+_magic_file.argtypes = [magic_t, c_char_p]
+_magic_file.errcheck = errorcheck_null
+
+def magic_file(cookie, filename):
+    return _magic_file(cookie, coerce_filename(filename))
+
+_magic_buffer = libmagic.magic_buffer
+_magic_buffer.restype = c_char_p
+_magic_buffer.argtypes = [magic_t, c_void_p, c_size_t]
+_magic_buffer.errcheck = errorcheck_null
+
+def magic_buffer(cookie, buf):
+    return _magic_buffer(cookie, buf, len(buf))
+
+magic_descriptor = libmagic.magic_descriptor
+magic_descriptor.restype = c_char_p
+magic_descriptor.argtypes = [magic_t, c_int]
+magic_descriptor.errcheck = errorcheck_null
+
+_magic_load = libmagic.magic_load
+_magic_load.restype = c_int
+_magic_load.argtypes = [magic_t, c_char_p]
+_magic_load.errcheck = errorcheck_negative_one
+
+def magic_load(cookie, filename):
+    return _magic_load(cookie, coerce_filename(filename))
+
+magic_setflags = libmagic.magic_setflags
+magic_setflags.restype = c_int
+magic_setflags.argtypes = [magic_t, c_int]
+
+magic_check = libmagic.magic_check
+magic_check.restype = c_int
+magic_check.argtypes = [magic_t, c_char_p]
+
+magic_compile = libmagic.magic_compile
+magic_compile.restype = c_int
+magic_compile.argtypes = [magic_t, c_char_p]
+
+
+
+MAGIC_NONE = 0x000000 # No flags
+MAGIC_DEBUG = 0x000001 # Turn on debugging
+MAGIC_SYMLINK = 0x000002 # Follow symlinks
+MAGIC_COMPRESS = 0x000004 # Check inside compressed files
+MAGIC_DEVICES = 0x000008 # Look at the contents of devices
+MAGIC_MIME = 0x000010 # Return a mime string
+MAGIC_MIME_ENCODING = 0x000400 # Return the MIME encoding
+MAGIC_CONTINUE = 0x000020 # Return all matches
+MAGIC_CHECK = 0x000040 # Print warnings to stderr
+MAGIC_PRESERVE_ATIME = 0x000080 # Restore access time on exit
+MAGIC_RAW = 0x000100 # Don't translate unprintable chars
+MAGIC_ERROR = 0x000200 # Handle ENOENT etc as real errors
+
+MAGIC_NO_CHECK_COMPRESS = 0x001000 # Don't check for compressed files
+MAGIC_NO_CHECK_TAR = 0x002000 # Don't check for tar files
+MAGIC_NO_CHECK_SOFT = 0x004000 # Don't check magic entries
+MAGIC_NO_CHECK_APPTYPE = 0x008000 # Don't check application type
+MAGIC_NO_CHECK_ELF = 0x010000 # Don't check for elf details
+MAGIC_NO_CHECK_ASCII = 0x020000 # Don't check for ascii files
+MAGIC_NO_CHECK_TROFF = 0x040000 # Don't check ascii/troff
+MAGIC_NO_CHECK_FORTRAN = 0x080000 # Don't check ascii/fortran
+MAGIC_NO_CHECK_TOKENS = 0x100000 # Don't check ascii/tokens
+
+# This package name conflicts with the one provided by upstream
+# libmagic.  This is a common source of confusion for users.  To
+# resolve, We ship a copy of that module, and expose it's functions
+# wrapped in deprecation warnings.
+def add_compat(to_module):
+
+    import warnings, re
+    from magic import compat
+
+    def deprecation_wrapper(compat, fn, alternate):
+        def _(*args, **kwargs):
+            warnings.warn(
+                "Using compatability mode with libmagic's python binding",
+                DeprecationWarning)
+
+            return compat[fn](*args, **kwargs)
+        return _
+
+    fn = [('detect_from_filename', 'magic.from_file'),
+          ('detect_from_content', 'magic.from_buffer'),
+          ('detect_from_fobj', 'magic.Magic.from_open_file'),
+          ('open', 'magic.Magic')]
+    for (fname, alternate) in fn:
+        to_module[fname] = deprecation_wrapper(compat.__dict__, fname, alternate)
+
+    # copy constants over, ensuring there's no conflicts
+    is_const_re = re.compile("^[A-Z_]+$")
+    allowed_inconsistent = set(['MAGIC_MIME'])
+    for name, value in compat.__dict__.items():
+        if is_const_re.match(name):
+            if name in to_module:
+                if name in allowed_inconsistent:
+                    continue
+                if to_module[name] != value:
+                    raise Exception("inconsistent value for " + name)
+                else:
+                    continue
+            else:
+                to_module[name] = value
+
+add_compat(globals())
--- /dev/null
+++ b/magic/compat.py
@@ -0,0 +1,285 @@
+# coding: utf-8
+
+'''
+Python bindings for libmagic
+'''
+
+import ctypes
+
+from collections import namedtuple
+
+from ctypes import *
+from ctypes.util import find_library
+
+
+def _init():
+    """
+    Loads the shared library through ctypes and returns a library
+    L{ctypes.CDLL} instance
+    """
+    return ctypes.cdll.LoadLibrary(find_library('magic'))
+
+_libraries = {}
+_libraries['magic'] = _init()
+
+# Flag constants for open and setflags
+MAGIC_NONE = NONE = 0
+MAGIC_DEBUG = DEBUG = 1
+MAGIC_SYMLINK = SYMLINK = 2
+MAGIC_COMPRESS = COMPRESS = 4
+MAGIC_DEVICES = DEVICES = 8
+MAGIC_MIME_TYPE = MIME_TYPE = 16
+MAGIC_CONTINUE = CONTINUE = 32
+MAGIC_CHECK = CHECK = 64
+MAGIC_PRESERVE_ATIME = PRESERVE_ATIME = 128
+MAGIC_RAW = RAW = 256
+MAGIC_ERROR = ERROR = 512
+MAGIC_MIME_ENCODING = MIME_ENCODING = 1024
+MAGIC_MIME = MIME = 1040  # MIME_TYPE + MIME_ENCODING
+MAGIC_APPLE = APPLE = 2048
+
+MAGIC_NO_CHECK_COMPRESS = NO_CHECK_COMPRESS = 4096
+MAGIC_NO_CHECK_TAR = NO_CHECK_TAR = 8192
+MAGIC_NO_CHECK_SOFT = NO_CHECK_SOFT = 16384
+MAGIC_NO_CHECK_APPTYPE = NO_CHECK_APPTYPE = 32768
+MAGIC_NO_CHECK_ELF = NO_CHECK_ELF = 65536
+MAGIC_NO_CHECK_TEXT = NO_CHECK_TEXT = 131072
+MAGIC_NO_CHECK_CDF = NO_CHECK_CDF = 262144
+MAGIC_NO_CHECK_TOKENS = NO_CHECK_TOKENS = 1048576
+MAGIC_NO_CHECK_ENCODING = NO_CHECK_ENCODING = 2097152
+
+MAGIC_NO_CHECK_BUILTIN = NO_CHECK_BUILTIN = 4173824
+
+FileMagic = namedtuple('FileMagic', ('mime_type', 'encoding', 'name'))
+
+
+class magic_set(Structure):
+    pass
+magic_set._fields_ = []
+magic_t = POINTER(magic_set)
+
+_open = _libraries['magic'].magic_open
+_open.restype = magic_t
+_open.argtypes = [c_int]
+
+_close = _libraries['magic'].magic_close
+_close.restype = None
+_close.argtypes = [magic_t]
+
+_file = _libraries['magic'].magic_file
+_file.restype = c_char_p
+_file.argtypes = [magic_t, c_char_p]
+
+_descriptor = _libraries['magic'].magic_descriptor
+_descriptor.restype = c_char_p
+_descriptor.argtypes = [magic_t, c_int]
+
+_buffer = _libraries['magic'].magic_buffer
+_buffer.restype = c_char_p
+_buffer.argtypes = [magic_t, c_void_p, c_size_t]
+
+_error = _libraries['magic'].magic_error
+_error.restype = c_char_p
+_error.argtypes = [magic_t]
+
+_setflags = _libraries['magic'].magic_setflags
+_setflags.restype = c_int
+_setflags.argtypes = [magic_t, c_int]
+
+_load = _libraries['magic'].magic_load
+_load.restype = c_int
+_load.argtypes = [magic_t, c_char_p]
+
+_compile = _libraries['magic'].magic_compile
+_compile.restype = c_int
+_compile.argtypes = [magic_t, c_char_p]
+
+_check = _libraries['magic'].magic_check
+_check.restype = c_int
+_check.argtypes = [magic_t, c_char_p]
+
+_list = _libraries['magic'].magic_list
+_list.restype = c_int
+_list.argtypes = [magic_t, c_char_p]
+
+_errno = _libraries['magic'].magic_errno
+_errno.restype = c_int
+_errno.argtypes = [magic_t]
+
+
+class Magic(object):
+    def __init__(self, ms):
+        self._magic_t = ms
+
+    def close(self):
+        """
+        Closes the magic database and deallocates any resources used.
+        """
+        _close(self._magic_t)
+
+    @staticmethod
+    def __tostr(s):
+        if s is None:
+            return None
+        if isinstance(s, str):
+            return s
+        try:  # keep Python 2 compatibility
+            return str(s, 'utf-8')
+        except TypeError:
+            return str(s)
+
+    @staticmethod
+    def __tobytes(b):
+        if b is None:
+            return None
+        if isinstance(b, bytes):
+            return b
+        try:  # keep Python 2 compatibility
+            return bytes(b, 'utf-8')
+        except TypeError:
+            return bytes(b)
+
+    def file(self, filename):
+        """
+        Returns a textual description of the contents of the argument passed
+        as a filename or None if an error occurred and the MAGIC_ERROR flag
+        is set. A call to errno() will return the numeric error code.
+        """
+        return Magic.__tostr(_file(self._magic_t, Magic.__tobytes(filename)))
+
+    def descriptor(self, fd):
+        """
+        Returns a textual description of the contents of the argument passed
+        as a file descriptor or None if an error occurred and the MAGIC_ERROR
+        flag is set. A call to errno() will return the numeric error code.
+        """
+        return Magic.__tostr(_descriptor(self._magic_t, fd))
+
+    def buffer(self, buf):
+        """
+        Returns a textual description of the contents of the argument passed
+        as a buffer or None if an error occurred and the MAGIC_ERROR flag
+        is set. A call to errno() will return the numeric error code.
+        """
+        return Magic.__tostr(_buffer(self._magic_t, buf, len(buf)))
+
+    def error(self):
+        """
+        Returns a textual explanation of the last error or None
+        if there was no error.
+        """
+        return Magic.__tostr(_error(self._magic_t))
+
+    def setflags(self, flags):
+        """
+        Set flags on the magic object which determine how magic checking
+        behaves; a bitwise OR of the flags described in libmagic(3), but
+        without the MAGIC_ prefix.
+
+        Returns -1 on systems that don't support utime(2) or utimes(2)
+        when PRESERVE_ATIME is set.
+        """
+        return _setflags(self._magic_t, flags)
+
+    def load(self, filename=None):
+        """
+        Must be called to load entries in the colon separated list of database
+        files passed as argument or the default database file if no argument
+        before any magic queries can be performed.
+
+        Returns 0 on success and -1 on failure.
+        """
+        return _load(self._magic_t, Magic.__tobytes(filename))
+
+    def compile(self, dbs):
+        """
+        Compile entries in the colon separated list of database files
+        passed as argument or the default database file if no argument.
+        The compiled files created are named from the basename(1) of each file
+        argument with ".mgc" appended to it.
+
+        Returns 0 on success and -1 on failure.
+        """
+        return _compile(self._magic_t, Magic.__tobytes(dbs))
+
+    def check(self, dbs):
+        """
+        Check the validity of entries in the colon separated list of
+        database files passed as argument or the default database file
+        if no argument.
+
+        Returns 0 on success and -1 on failure.
+        """
+        return _check(self._magic_t, Magic.__tobytes(dbs))
+
+    def list(self, dbs):
+        """
+        Check the validity of entries in the colon separated list of
+        database files passed as argument or the default database file
+        if no argument.
+
+        Returns 0 on success and -1 on failure.
+        """
+        return _list(self._magic_t, Magic.__tobytes(dbs))
+
+    def errno(self):
+        """
+        Returns a numeric error code. If return value is 0, an internal
+        magic error occurred. If return value is non-zero, the value is
+        an OS error code. Use the errno module or os.strerror() can be used
+        to provide detailed error information.
+        """
+        return _errno(self._magic_t)
+
+
+def open(flags):
+    """
+    Returns a magic object on success and None on failure.
+    Flags argument as for setflags.
+    """
+    return Magic(_open(flags))
+
+
+# Objects used by `detect_from_` functions
+mime_magic = Magic(_open(MAGIC_MIME))
+mime_magic.load()
+none_magic = Magic(_open(MAGIC_NONE))
+none_magic.load()
+
+
+def _create_filemagic(mime_detected, type_detected):
+    mime_type, mime_encoding = mime_detected.split('; ')
+
+    return FileMagic(name=type_detected, mime_type=mime_type,
+                     encoding=mime_encoding.replace('charset=', ''))
+
+
+def detect_from_filename(filename):
+    '''Detect mime type, encoding and file type from a filename
+
+    Returns a `FileMagic` namedtuple.
+    '''
+
+    return _create_filemagic(mime_magic.file(filename),
+                             none_magic.file(filename))
+
+
+def detect_from_fobj(fobj):
+    '''Detect mime type, encoding and file type from file-like object
+
+    Returns a `FileMagic` namedtuple.
+    '''
+
+    file_descriptor = fobj.fileno()
+    return _create_filemagic(mime_magic.descriptor(file_descriptor),
+                             none_magic.descriptor(file_descriptor))
+
+
+def detect_from_content(byte_content):
+    '''Detect mime type, encoding and file type from bytes
+
+    Returns a `FileMagic` namedtuple.
+    '''
+
+    return _create_filemagic(mime_magic.buffer(byte_content),
+                             none_magic.buffer(byte_content))
--- /dev/null
+++ b/test/libmagic_test.py
@@ -0,0 +1,35 @@
+# coding: utf-8
+
+import unittest
+
+import magic
+
+
+class MagicTestCase(unittest.TestCase):
+
+    filename = 'test/testdata/test.pdf'
+    expected_mime_type = 'application/pdf'
+    expected_encoding = 'us-ascii'
+    expected_name = 'PDF document, version 1.2'
+
+    def assert_result(self, result):
+        self.assertEqual(result.mime_type, self.expected_mime_type)
+        self.assertEqual(result.encoding, self.expected_encoding)
+        self.assertEqual(result.name, self.expected_name)
+
+    def test_detect_from_filename(self):
+        result = magic.detect_from_filename(self.filename)
+        self.assert_result(result)
+
+    def test_detect_from_fobj(self):
+        with open(self.filename) as fobj:
+            result = magic.detect_from_fobj(fobj)
+        self.assert_result(result)
+
+    def test_detect_from_content(self):
+        with open(self.filename) as fobj:
+            result = magic.detect_from_content(fobj.read(4096))
+        self.assert_result(result)
+
+if __name__ == '__main__':
+    unittest.main()
--- a/test/run.sh
+++ b/test/run.sh
@@ -8,7 +8,10 @@
 
 echo "python2.6"
 python2.6 ${THISDIR}/test.py
+python2.6 ${THISDIR}/libmagic_test.py
 echo "python2.7"
 python2.7 ${THISDIR}/test.py
-echo "python3.0"
+python2.7 ${THISDIR}/libmagic_test.py
+echo "python3"
 python3 ${THISDIR}/test.py
+python3 ${THISDIR}/libmagic_test.py
--- a/test/test.py
+++ b/test/test.py
@@ -38,6 +38,12 @@
         b = b'#!/usr/bin/env python\nprint("foo")'
         self.assertEqual("text/x-python", m.from_buffer(b))
                 
+
+    def test_open_file(self):
+        m = magic.Magic(mime=True)
+        with open(os.path.join(self.TESTDATA_DIR, "test.pdf")) as f:
+            self.assertEqual("application/pdf", m.from_open_file(f))
+
     def test_mime_types(self):
         dest = os.path.join(MagicTest.TESTDATA_DIR, b'\xce\xbb'.decode('utf-8'))
         shutil.copyfile(os.path.join(MagicTest.TESTDATA_DIR, 'lambda'), dest)