tarfile.py 文件源码

def read(self, size):
        b = [self.buf]
        x = len(self.buf)
        while x < size:
            raw = self.fileobj.read(self.blocksize)
            if not raw:
                break
            data = self.bz2obj.decompress(raw)
            b.append(data)
            x += len(data)
        self.buf = "".join(b)

        buf = self.buf[:size]
        self.buf = self.buf[size:]
        self.pos += len(buf)
        return buf