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78 lines
2.6 KiB
Python
78 lines
2.6 KiB
Python
# Copyright (C) 2006, Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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import os, time, md5
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from sugar import env
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from sugar import util
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class BuddyIconCache(object):
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"""Caches icons on disk and finds them based on md5 hash."""
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def __init__(self):
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ppath = env.get_profile_path()
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self._cachepath = os.path.join(ppath, "cache", "buddy-icons")
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if not os.path.exists(self._cachepath):
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os.makedirs(self._cachepath)
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self._cache = {}
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# Read all cached icons and their sums
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for fname in os.listdir(self._cachepath):
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m = md5.new()
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data = self._get_icon_data(fname)
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if len(data) == 0:
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continue
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m.update(data)
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printable_hash = util.printable_hash(m.digest())
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self._cache[printable_hash] = fname
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del m
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def _get_icon_data(self, fname):
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fd = open(os.path.join(self._cachepath, fname), "r")
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data = fd.read()
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fd.close()
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del fd
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return data
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def get_icon(self, printable_hash):
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if not isinstance(printable_hash, unicode):
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raise RuntimeError("printable_hash must be a unicode string.")
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try:
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fname = self._cache[printable_hash]
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return self._get_icon_data(fname)
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except KeyError:
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pass
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return None
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def add_icon(self, icon_data):
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if len(icon_data) == 0:
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return
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m = md5.new()
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m.update(icon_data)
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printable_hash = util.printable_hash(m.digest())
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if self._cache.has_key(printable_hash):
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del m
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return
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# Write the icon to disk and add an entry to our cache for it
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m.update(time.asctime())
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fname = util.printable_hash(m.digest())
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fd = open(os.path.join(self._cachepath, fname), "w")
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fd.write(icon_data)
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fd.close()
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self._cache[printable_hash] = fname
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del m
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