is_sparse.py

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from BitTorrent.platform import is_sparse, get_allocated_regions
import os
import sys
import glob

for p in glob.glob(sys.argv[1]):
    s = '%s is ' % p
    if not is_sparse(p):
        s += 'not sparse'
    else:
        a = get_allocated_regions(p)
        print a
        total = 0
        for x, y in a.iterrange():
            total += y - x
        real = float(total) / float(os.path.getsize(p))
        sparse = 1.0 - real
        sparse *= 100.0
        s += '%.2f%% sparse' % sparse
                                
    print s