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将 7 位文本转换为纯文本 perl

发布于 2024-10-07 21:51:23 字数 53 浏览 0 评论 0原文

我解析电子邮件消息，发现编码部分：7bit 如何将这部分的文本转换为纯文本？我用 Perl

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捶死心动 2024-10-14 21:51:23

Content-Transfer-Encoding: 7bit

意味着文本已经是纯旧的 ASCII 文本。无需转换。（好吧，除非 Content-Type 标头指示基于非 ASCII 的字符集，但这种情况非常罕见，尤其是对于 7 位文本。）

Content-Transfer-Encoding: 7bit

means that the text is already plain old ASCII text. No conversion is necessary. (Well, unless the Content-Type header indicates a non-ASCII-based charset, but those are pretty rare, especially with 7bit text.)

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倾其所爱 2024-10-14 21:51:23

听起来您有 UU 编码数据（旧方法）或 MIME 编码。要解决这个问题，您可以使用 Convert::UU 和 MIME::Base64 CPAN 模块。

要使用 MIME::Base64（或其纯 Perl 实现，MIME::Base64::Perl）：

use MIME::Base64::Perl;
my $decoded = decode_base64($encoded);

你怎么知道其中的区别？

现代 MIME 编码的文本看起来像这样（特别注意MIME-Version: 标头告诉您它是 MIME 编码的，Content-Transfer-Encoding 标头告诉您编码基础 - 如果它不是 base64，您需要一个不同的 CPAN 模块：

MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="frontier"

This is a message with multiple parts in MIME format.
--frontier
Content-Type: text/plain

This is the body of the message.
--frontier
Content-Type: application/octet-stream
Content-Transfer-Encoding: base64

UU 编码文本看起来像这样：

begin 644 cat.txt
#0V%T
`
end

如果编码数据看起来与上述示例不同，请发布确切的格式，以便我们确定它是什么。

It sounds like you have UU-encoded data (older method) or MIME-encoded. To deal with that, you can use Convert::UU and MIME::Base64 CPAN modules respectively.

To use MIME::Base64 (or its pure-Perl implementation, MIME::Base64::Perl):

use MIME::Base64::Perl;
my $decoded = decode_base64($encoded);

How do you know the difference?

The modern MIME encoded text looks like this (Especially pay attention to MIME-Version: header which tells you it's MIME-encoded as well as Content-Transfer-Encoding header which tells you the encoding base - if it's not base64, you need a different CPAN module:

MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="frontier"

This is a message with multiple parts in MIME format.
--frontier
Content-Type: text/plain

This is the body of the message.
--frontier
Content-Type: application/octet-stream
Content-Transfer-Encoding: base64

UU-encoded text would look something like: