将文本格式的 JPEG 从电子邮件源转换回 JPEG
我不久前收到一封电子邮件，其中包含图像附件。从那时起，hotmail 似乎已停止为我托管图像，因为当我打开邮件时，该图像不再可用。
但是，消息源仍然完好无损，如果我没记错的话，消息源（文本形式）也包含图像。
问题当然是它是文本形式的。 （我相信）包含图像的部分看起来像这样：（只是前几行）
<块引用>--Apple-Mail-2--733971985
内容配置：内联；文件名=photo.JPG 内容 ID： <3F8BDC26-81F3-4BA2-9071-53E78CB3DB63/photo.JPG>
内容类型：image/jpeg； name=photo.JPG 内容传输编码： Base64
/9j/4AAQSkZJRgABAQEASABIAAD/4gxYSUNDX1BST0ZJTEUAAQEAAAxITGlubwIQAABtbnRyUkdC IFhZWiAHzgACAAkABgAxAABhY3NwTVNGVAAAAABJUMgc1JHQgAAAAAAAAAAAAAAAAAA9tYAAQAA AADTLUhQICAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABFj CHJ0AAABUAAAADNkZXNjAAABhAAAAGx3dHB0AAAB8AAAABRia3B0AAACBAAAABRyWFlaAAACGAAA ABRnWFlaAAACLAAAABRiWFlaAAACQAAAABRkbW5kAAACVAAAAHBkbWRkAAACxAAAAIh2dWVkAAAD TAAAAIZ2aWV3AAAD1AAAACRsdW1pAAAD+AAAABRtZWFzAAAEDAAAACR0ZWNoAAAEMAAAAAxyVFJD
它是从我的 iPhone 发送到 Hotmail 的。
这段文字是否代表了我所缺少的图像？我不相信有一个程序可以为我转换这个，所以我愿意编写自己的程序来完成它。问题是，这可能吗？
I received an email a while ago with an image attachment in it. Since then, it seems hotmail has stopped hosting the image for me as when I open the message, the image is no longer available.
However, the message source is still intact, and if I'm not wrong, the message source - in text form - also contains the image.
The problem is of course it is in text form. The part which (I believe) contains the image looks something like this: (Just the first few lines)
--Apple-Mail-2--733971985
Content-Disposition: inline; filename=photo.JPG Content-Id:
<3F8BDC26-81F3-4BA2-9071-53E78CB3DB63/photo.JPG>Content-Type: image/jpeg; name=photo.JPG Content-Transfer-Encoding:
base64/9j/4AAQSkZJRgABAQEASABIAAD/4gxYSUNDX1BST0ZJTEUAAQEAAAxITGlubwIQAABtbnRyUkdC
IFhZWiAHzgACAAkABgAxAABhY3NwTVNGVAAAAABJRUMgc1JHQgAAAAAAAAAAAAAAAAAA9tYAAQAA
AADTLUhQICAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABFj
cHJ0AAABUAAAADNkZXNjAAABhAAAAGx3dHB0AAAB8AAAABRia3B0AAACBAAAABRyWFlaAAACGAAA
ABRnWFlaAAACLAAAABRiWFlaAAACQAAAABRkbW5kAAACVAAAAHBkbWRkAAACxAAAAIh2dWVkAAAD
TAAAAIZ2aWV3AAAD1AAAACRsdW1pAAAD+AAAABRtZWFzAAAEDAAAACR0ZWNoAAAEMAAAAAxyVFJD
It was sent from my iPhone into Hotmail.
Is this text representing the image that I am missing? I don't believe there is a program out there that can convert this for me, so I am willing to write my own program to do it. Question is, is this even possible?
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是的，通过各种方法，这是完全可能的。如果您有完整的消息源，您可以将其保存到一个文件中（例如
*.eml）并在邮件客户端（例如 Mozilla Thunderbird）中打开它；这应该会显示整个消息，包括附加的图像。如果没有，它仍然是可能的：正如您从标题中看到的，图像是 Base64 编码的。您需要恢复此转换 - 使用您自己的代码（例如 PHP 有 base64_decode() ），或通过在线提供的各种base64解码器（例如这个）。在本例中，您要解码的部分是以
/9j/4AAQSk开头的块。将生成的文件重命名为photo.JPG（如电子邮件标题中所示），然后就完成了。请注意，这需要您验证是否已将整个 Base64 编码的文件通过解码器 - Base64 没有标记来检测文件结尾。
Yes, this is entirely possible, by various methods. If you have the entire message source, you could save it into a file (something like
*.eml) and open it in a mail client (e.g. Mozilla Thunderbird); this should show you the entire message including the attached image.If not, it's still possible: as you can see from the headers, the image is base64-encoded. You need to revert this transformation - either using your own code (e.g. PHP has base64_decode()), or through various base64-decoders available online (e.g. this). The part you want to decode is the block starting with
/9j/4AAQSkin this case. Rename the resulting filephoto.JPG(as indicated in the e-mail headers) and you're done.Note that this requires you to verify that you have put the entire base64-encoded file through the decoder - base64 has no marker to detect the end of file.