fwunpack.py 文件源码

def searchUnpackAndroidSparse(filename, tempdir=None, blacklist=[], offsets={}, scanenv={}, debug=False):
    hints = {}
    if not 'android-sparse' in offsets:
        return ([], blacklist, [], hints)
    if offsets['android-sparse'] == []:
        return ([], blacklist, [], hints)

    diroffsets = []
    counter = 1
    tags = []
    for offset in offsets['android-sparse']:
        blacklistoffset = extractor.inblacklist(offset, blacklist)
        if blacklistoffset != None:
            continue
        ## first see if the major version is correct
        sparsefile = open(filename, 'rb')
        sparsefile.seek(offset+4)
        sparsedata = sparsefile.read(2)
        sparsefile.close()
        if len(sparsedata) != 2:
            break
        majorversion = struct.unpack('<H', sparsedata)[0]
        if not majorversion == 1:
            continue

        tmpdir = dirsetup(tempdir, filename, "android-sparse", counter)
        res = unpackAndroidSparse(filename, offset, tmpdir)
        if res != None:
            (sparsesize, sparsedir) = res
            diroffsets.append((sparsedir, offset, sparsesize))

            blacklist.append((offset, offset + sparsesize))
            counter = counter + 1
        else:
            ## cleanup
            os.rmdir(tmpdir)
    return (diroffsets, blacklist, tags, hints)