有三种主要的方式可在软件内实现一个文件格式库。

There are three main ways to implement a file format library in software.

youdao

这种方法提供了文件格式库和应用程序代码之间某种程度上的分离。

This method gives you some degree of separation between a file format library and your application code.

youdao

现在有一些协议或文件格式库是在GPL条款下发布的，且得到了一些使用。

There are protocol or file format libraries that are released under GPL terms, and seem to be somewhat used.

youdao