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Update Google Chrome localstorage file for version compatibility (Python recipe) by Russell
ActiveState Code (http://code.activestate.com/recipes/577855/)

Google chrome changes the way key/value stores in localstorage file during upgrading from 11 to 15. This breaks data of many websites and extensions which depends on localstorage. This script upgrade the old localstorage data to make them work again.

Python, 50 lines
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import sqlite3, StringIO, sys

def buf2unicode(data):
    u = StringIO.StringIO()
    for i in xrange(0, len(data), 2):
        f = unichr(ord(data[i+1]) << 8 | ord(data[i+0]))
        u.write(f)
    return u.getvalue()

def unicode2buf(data):
    assert(type(data) == unicode)
    ba = bytearray()
    for i in data:
        t = ord(i)
        b1 = 255 & (t >> 8)
        b0 = 255 & t
        ba.append(b0)
        ba.append(b1)
    return buffer(ba)

def main(name):
    try:
        conn = sqlite3.connect(name)
    except:
        print name, "can't be opened."

    c = conn.cursor()
    try:
        r = c.execute('select * from ItemTable')
    except:
        print name, "is not a localstorage file."

    data = {}
    for key, val in r:
        if type(val) == unicode:
            data[key] = unicode2buf(val)

    for k in data:
        c.execute('update ItemTable set value=? where key=?', (data[k], k))
        print "Updated", k

    conn.commit()
    c.close()

if __name__ == '__main__':
    if len(sys.argv) > 1:
        main(sys.argv[1])
    else:
        print "Usage: %s target_filename" % sys.argv[0]
        print "target file will be modified. Please make backups."
Tags: chrome, chromium, localstorage