________________________________
> From: [email protected]
> To: [email protected]
> Date: Tue, 25 May 2010 18:37:45 -0400
> Subject: Re: [iText-questions] Blank PDF after it is transfered through SMTP
>
>
>
>
>
>
>
>
> Thank you for pointing out "shave bytes".
>
> In fact, this time it is "inflated bytes". Comparing the pdf file generated
> directly and the one transferred through SMTP using
> "content-transfer-encoding: quoted-printable", all 0A is inflated to 0D 0A
> and all 0D is also inflated to 0D 0A. There is no other difference. Just this
> minor inflation blows up acrobat reader and it shows up as blank pdf. (There
> is no such inflation if base64 is used as content-transfer-encoding.)
What exactly are these characters? Why might this make sense with some data
types?
>
> So the pdf generated by iText contains either 0A or 0D but not 0D 0A
> together. Is this by design? Or is it configurable?
I guess if it did this consistently, you could use dos2unix or sed to fix the
file.
>
> P.S.: all test is on Windows platform. Attached page_numbers.pdf is generated
> directly and test.pdf is received through email as described above using
> "quoted-printable" encoding.
See this for example, learn to use ietf for these types of issues or other
standard
groups,
http://tools.ietf.org/rfc/rfc2045.txt
6.6. Canonical Encoding Model
There was some confusion, in the previous versions of this RFC,
regarding the model for when email data was to be converted to
canonical form and encoded, and in particular how this process would
affect the treatment of CRLFs, given that the representation of
newlines varies greatly from system to system, and the relationship
between content-transfer-encodings and character sets. A canonical
model for encoding is presented in RFC 2049 for this reason.
6.7. Quoted-Printable Content-Transfer-Encoding
The Quoted-Printable encoding is intended to represent data that
largely consists of octets that correspond to printable characters in
the US-ASCII character set. It encodes the data in such a way that
the resulting octets are unlikely to be modified by mail transport.
If the data being encoded are mostly US-ASCII text, the encoded form
of the data remains largely recognizable by humans. A body which is
entirely US-ASCII may also be encoded in Quoted-Printable to ensure
the integrity of the data should the message pass through a
character-translating, and/or line-wrapping gateway.
>
>
>> Date: Mon, 24 May 2010 18:00:38 +0200
>> From: [email protected]
>> To: [email protected]
>> Subject: Re: [iText-questions] Blank PDF after it is transfered through SMTP
>>
>> Jiangang Song wrote:
>>> Or is there anything wrong with my usage of Java mail?
>>
>> The "blank page problem" is (as documented in the book) caused by the
>> fact that some applications (such as Java mail?) "shave bytes".
>>
>> PDF is a binary file format. You need to transfer it as a binary file.
>> If you open up the PDF with the "shaved bytes" in a text editor, you'll
>> see that there are lots of question marks. Those are bytes that have
>> lost a bit due to the way you've transferred them.
>>
>> You need to make sure that you transfer the file as a binary file.
>> --
>> This answer is provided by 1T3XT BVBA
>> http://www.1t3xt.com/ - http://www.1t3xt.info
>>
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