Can't construct a valid cross reference stream.

forums_noreply@adobe.com — Sat, 27 Sep 2014 12:38:15 GMT

I'm building a PDF generation library from scratch.

Currently I'm having trouble generating a valid crossreference stream, but I'm totally lost as to why it is invalid.

%PDF-1.7
%µ
0 0 obj
<<
/Pages 1 0 R
/Type /Catalog
>>
endobj
1 0 obj
<<
/Type /Pages
/Kids [2 0 R]
/Count 1
>>
endobj
2 0 obj
<<
/Parent 1 0 R
/Type /Page
/MediaBox [0 0 612 792]
/Contents 3 0 R
>>
endobj
3 0 obj
<<
/Length 0
>>
stream
endstream
endobj
4 0 obj
<<
/Type /XRef
/W [1 2 0]
/Size 6
/Length 16
>>
stream
...
endstream
endobj
startxref
254
%%EOF

The full pdf file can be found here: https://www.dropbox.com/s/mvn0xptf0lasb28/test.pdf?dl=0

According to the spec a PDF file can consist of only objects with exemption of the first line (the 2nd is a comment) and the part from startxref.

Any tips would be greatly appreciated.

For simplicitly I've added the stream (extract via a hex editor) below:

0A 01 00 0D 01 00 3E 01 00 77 01 00 CE 01 00 FE 0A

Note that the stream starts and ends with a newline character. There are 17 bytes and the last line ending is not part of the stream length.

The remaining bytes 16 bytes have 15 bytes of data, (the first line ending is ignored (right?)):

01 00 0D

01 00 3E

01 00 77

01 00 CE

01 00 FE

As far as I can tell this PDF file's cross reference stream is valid. Any help would be greatly appreciated!

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Can't construct a valid cross reference stream.