PDF字节范围无效

Question

这个问题遵循one。我以编程方式签署PDF。每个新签名都以增量方式添加，我在％EOF之后添加签名字典。使用一个签名一切正常，我得到绿色勾号，我的签名是有效的，正如您在上一个问题中看到的那样。当我第二次尝试签名时出现问题，我收到了这些错误：

我不明白的是我的计算字节范围的方式没有改变，并且1签名工作正常。我错过了什么吗？这是我的文件作为字符串，因为我的代理不能使用任何文件上传器。如果您需要更多信息，请告诉我，谢谢。

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我在第二个签名中加上“...”，因为Stack Overflow的字符限制，但它与第一​​个签名的长度相同。

编辑：以下是第一个签名PDF的链接，此处是指向两次签名的second的链接。

Answer 1

在您最新的交叉参考表中

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除了对象1之外的所有已使用对象的偏移量都太低了7.您对交叉引用表的引用

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28478

也太低了7。

此类交叉引用错误使Adobe Reader＆＃34; repair＆＃34;加载时的文件，特别是导致移动现有对象等。

在文件中移动对象显然会使以前正确的有符号字节范围偏移无效。

我在这里将文件的结尾修复为

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现在第一个签名被报告为有效，第二个签名因签名后的更改或损坏而无效 - 这是正确的，毕竟我改变了一些东西 - 但不是由于字节范围问题：

PS：如果没有二进制原始文件，很难找到这样的问题，因为粘贴的PDF内部的偏移量无论如何都是不正确的，并且必须尝试识别不同类型的错误...