0

When I plug this into an on-line decoder utility (https://www.base64decode.org/) it produces the expected outcome:

yLContent-Type: multipart/related; boundary="=_related 00615E8385257E0C_="
This is a multipart message in MIME format.
 /--=_related 00615E8385257E0C_=
Content-Type: text/html; charset="US-ASCII"
<font size=1 face="sans-serif">This is rich text</font><font size=3> </font>
<p><img src=cid:_1_170D5344170D4F4400615E8385257E0C>
" q--=_related 00615E8385257E0C_=
Content-Type: image/gif
Content-ID: <_1_170D5344170D4F4400615E8385257E0C>
Content-Transfer-Encoding: base64
R0lGODlhdgFcAOYAAOjw..................

When I try to convert using the following Java code

File mimecontent=new File("C:/temp/mimecontent.txt") ;//please see base64 text below
String instr=new String(FileUtils.readFileToString(mimecontent));
BASE64Decoder decoder = new BASE64Decoder();
byte[] decodedBytes = decoder.decodeBuffer(instr);
System.out.println(new String(decodedBytes));

I get the bad output shown below
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==

The text I'm trying to decode:

AgACAAAAAQB5AAAATAAAAAAAAABDb250ZW50LVR5cGU6IG11bHRpcGFydC9yZWxhdGVkOyBib3Vu ZGFyeT0iPV9yZWxhdGVkIDAwNjE1RTgzODUyNTdFMENfPSINCg0KVGhpcyBpcyBhIG11bHRpcGFy 
dCBtZXNzYWdlIGluIE1JTUUgZm9ybWF0Lg0K
AgADAAAAAgDTACAALwAAAAAAAAAtLT1fcmVsYXRlZCAwMDYxNUU4Mzg1MjU3RTBDXz0NCkNvbnRl bnQtVHlwZTogdGV4dC9odG1sOyBjaGFyc2V0PSJVUy1BU0NJSSINCg0KPGZvbnQgc2l6ZT0xIGZh 
Y2U9InNhbnMtc2VyaWYiPlRoaXMgaXMgcmljaCB0ZXh0PC9mb250Pjxmb250IHNpemU9Mz4gPC9m b250Pg0KPHA+PGltZyBzcmM9Y2lkOl8xXzE3MEQ1MzQ0MTcwRDRGNDQwMDYxNUU4Mzg1MjU3RTBD Pg0K
AgADAAAAAgD7IiAAcQAAAAAAAAAtLT1fcmVsYXRlZCAwMDYxNUU4Mzg1MjU3RTBDXz0NCkNvbnRl bnQtVHlwZTogaW1hZ2UvZ2lmDQpDb250ZW50LUlEOiA8XzFfMTcwRDUzNDQxNzBENEY0NDAwNjE1 RTgzODUyNTdFMEM
+DQpDb250ZW50LVRyYW5zZmVyLUVuY29kaW5nOiBiYXNlNjQNCg0KUjBsR09E bGhkZ0ZjQU9ZQUFPancrRWlvWUFDSVVCQ1lXQmlZYUFpUVlEaWdXQWlnY0FDUWNFQ3dTQ2lnYU9E 
NHdQLy8vemlnWU1Ebw0KcUFpUVVOajR1SmpRa0JpWVlKalFpQ0NZWUhqQWdIakFjSWpJbUhDNGtM amdzTkR3dVBENDhJalFtR0M0ZUJpWVdEQ2dXRUNvWU9qdw0KNkxqb3NHQ3dpQ2lnV0RpZ2VIaTRt 
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Braiam
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jim_beam
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  • So what does `instr` look like? And assuming `readFileToString` returns a `String`, why are you creating another string? – Jon Skeet Mar 19 '15 at 16:42
  • When I remove whitespace (including newlines) from your base64 text and run it through window.atob(), I get your good partial output which appears to be a message header followed by a separate base64 encoded string which appears to be an inline gif attachment. Maybe try removing whitespace before passing to your decoder. – swornabsent Mar 19 '15 at 16:46
  • Also, what you've listed for bad output is the tail end of the inline base64-encoded image, so if that's all you're seeing you might be overflowing the variable you're assigning it to. – swornabsent Mar 19 '15 at 16:59
  • when I remove all white space, the code returns what looks like a small upside down "L" – jim_beam Mar 19 '15 at 17:06
  • Thank you all. swornabsent, it is an image at the end (not sure how know that so quickly). If it is an overflow issue, is there an easy way to correct that? – jim_beam Mar 19 '15 at 17:10
  • Thank you for the hints. I got it fixed by following the code at this url --http://stackoverflow.com/questions/2250421/how-do-i-encode-decode-short-strings-as-base64-using-gwt – jim_beam Mar 19 '15 at 18:54

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