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imp.py
__license__   = 'GPL v3'
__copyright__ = '2008, Ashish Kulkarni <kulkarni.ashish@gmail.com>'
'''Read meta information from IMP files'''

import sys

from calibre.ebooks.metadata import MetaInformation, string_to_authors

MAGIC = ['\x00\x01BOOKDOUG', '\x00\x02BOOKDOUG']

def get_metadata(stream):
    """ Return metadata as a L{MetaInfo} object """
    title = 'Unknown'
    mi = MetaInformation(title, ['Unknown'])
    stream.seek(0)
    try:
        if stream.read(10) not in MAGIC:
            print >>sys.stderr, u'Couldn\'t read IMP header from file'
            return mi

        def cString(skip=0):
            result = ''
            while 1:
                data = stream.read(1)
                if data == '\x00':
                    if not skip: return result
                    skip -= 1
                    result, data = '', ''
                result += data

        stream.read(38) # skip past some uninteresting headers
        _, category, title, author = cString(), cString(), cString(1), cString(2)

        if title:
            mi.title = title
        if author:
            mi.authors = string_to_authors(author)
            mi.author = author
        if category:
            mi.category = category
    except Exception, err:
        msg = u'Couldn\'t read metadata from imp: %s with error %s'%(mi.title, unicode(err))
        print >>sys.stderr, msg.encode('utf8')
    return mi

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