New file(1) port

external/bsd/file/dist/python/magic.py

@@ -0,0 +1,204 @@
+#!/usr/bin/env python
+'''
+Python bindings for libmagic
+'''
+
+import ctypes
+
+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
+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
+
+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)
+
+    def file(self, file):
+        """
+        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 _file(self._magic_t, file)
+
+    def descriptor(self, fd):
+        """
+        Like the file method, but the argument is a file descriptor.
+        """
+        return _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 _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 _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, file=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, file)
+
+    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.
+        Returns 0 on success and -1 on failure.
+        The compiled files created are named from the basename(1) of each file
+        argument with ".mgc" appended to it.
+        """
+        return _compile(self._magic_t, 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, 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, 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))