symbian-qemu-0.9.1-12/python-win32-2.6.1/lib/whichdb.py
author mikek
Mon, 17 May 2010 18:37:02 +0100
changeset 16 ccc8ba7d117c
parent 1 2fb8b9db1c86
permissions -rw-r--r--
Build was broken by a type in gui_common.h
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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# !/usr/bin/env python
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"""Guess which db package to use to open a db file."""
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import os
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import struct
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import sys
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try:
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    import dbm
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    _dbmerror = dbm.error
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except ImportError:
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    dbm = None
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    # just some sort of valid exception which might be raised in the
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    # dbm test
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    _dbmerror = IOError
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def whichdb(filename):
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    """Guess which db package to use to open a db file.
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    Return values:
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    - None if the database file can't be read;
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    - empty string if the file can be read but can't be recognized
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    - the module name (e.g. "dbm" or "gdbm") if recognized.
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    Importing the given module may still fail, and opening the
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    database using that module may still fail.
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    """
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    # Check for dbm first -- this has a .pag and a .dir file
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    try:
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        f = open(filename + os.extsep + "pag", "rb")
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        f.close()
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        # dbm linked with gdbm on OS/2 doesn't have .dir file
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        if not (dbm.library == "GNU gdbm" and sys.platform == "os2emx"):
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            f = open(filename + os.extsep + "dir", "rb")
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            f.close()
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        return "dbm"
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    except IOError:
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        # some dbm emulations based on Berkeley DB generate a .db file
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        # some do not, but they should be caught by the dbhash checks
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        try:
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            f = open(filename + os.extsep + "db", "rb")
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            f.close()
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            # guarantee we can actually open the file using dbm
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            # kind of overkill, but since we are dealing with emulations
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            # it seems like a prudent step
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            if dbm is not None:
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                d = dbm.open(filename)
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                d.close()
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                return "dbm"
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        except (IOError, _dbmerror):
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            pass
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    # Check for dumbdbm next -- this has a .dir and a .dat file
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    try:
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        # First check for presence of files
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        os.stat(filename + os.extsep + "dat")
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        size = os.stat(filename + os.extsep + "dir").st_size
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        # dumbdbm files with no keys are empty
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        if size == 0:
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            return "dumbdbm"
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        f = open(filename + os.extsep + "dir", "rb")
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        try:
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            if f.read(1) in ("'", '"'):
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                return "dumbdbm"
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        finally:
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            f.close()
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    except (OSError, IOError):
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        pass
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    # See if the file exists, return None if not
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    try:
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        f = open(filename, "rb")
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    except IOError:
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        return None
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    # Read the start of the file -- the magic number
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    s16 = f.read(16)
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    f.close()
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    s = s16[0:4]
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    # Return "" if not at least 4 bytes
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    if len(s) != 4:
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        return ""
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    # Convert to 4-byte int in native byte order -- return "" if impossible
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    try:
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        (magic,) = struct.unpack("=l", s)
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    except struct.error:
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        return ""
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    # Check for GNU dbm
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    if magic == 0x13579ace:
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        return "gdbm"
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    # Check for old Berkeley db hash file format v2
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    if magic in (0x00061561, 0x61150600):
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        return "bsddb185"
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    # Later versions of Berkeley db hash file have a 12-byte pad in
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    # front of the file type
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    try:
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        (magic,) = struct.unpack("=l", s16[-4:])
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    except struct.error:
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        return ""
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    # Check for BSD hash
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    if magic in (0x00061561, 0x61150600):
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        return "dbhash"
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    # Unknown
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    return ""
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if __name__ == "__main__":
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    for filename in sys.argv[1:]:
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        print whichdb(filename) or "UNKNOWN", filename